Charging device, charging pile and charging method

Abstract

The application discloses a charging device, a charging pile and a charging method. The charging device comprises an energy storage module and a control device. The charging device is configured to charge a battery device through the energy storage module. The control device is used for determining charging demand information of the battery device, wherein the charging demand information is used for indicating a charging demand power of the battery device; determining discharge capacity information of the energy storage module; determining charging parameters of the charging device according to the discharge capacity information and the charging demand information; and charging the battery device according to the charging parameters, wherein a charging power corresponding to the charging parameters is less than or equal to the charging demand power. In this way, on the one hand, the charging demand of the battery device can be met within the discharge capacity range of the charging device; on the other hand, the purpose of small-power input and large-power output for charging the battery device can be achieved without modifying the power grid.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to the following patent applications, the contents of which are incorporated herein by reference in their entirety:

[0003] PCT International Patent Application No. PCT / CN2024 / 093486, titled "Charging Method and Charging Device", filed on May 15, 2024;

[0004] PCT International Patent Application No. PCT / CN2024 / 093513, titled "Charging Device, Charging Pile and Charging and Storing System", filed on May 15, 2024;

[0005] PCT International Patent Application No. PCT / CN2024 / 102652, titled "Battery Cell, Battery and Electric Device", filed on June 28, 2024. TECHNICAL FIELD

[0006] The present application relates to the technical field of charging, in particular to a charging device, a charging pile and a charging method. BACKGROUND

[0007] With the development of the times, electric vehicles have great market prospects and can effectively promote energy saving and emission reduction, which is conducive to the development and progress of society due to their high environmental protection, low noise and low use cost. The charging speed of electric vehicles affects the development and application of electric vehicles, and affects the acceptance of electric vehicles by the public.

[0008] Therefore, how to improve the charging speed of electric vehicles is a problem to be solved. SUMMARY

[0009] The embodiments of the present application provide a charging device, a charging pile and a charging method, which can effectively improve the charging speed of the battery device at a lower cost.

[0010] In a first aspect, the present application provides a charging device, comprising an energy storage device and a control device, the charging device is configured to charge a battery device through the energy storage device, and the control device is used to: determine charging demand information of the battery device, the charging demand information being used to indicate a charging demand power of the battery device; determine discharge capability information of the energy storage device; determine charging parameters of the charging device according to the discharge capability information and the charging demand information; and charge the battery device according to the charging parameters, wherein the charging power corresponding to the charging parameters is less than or equal to the charging demand power.

[0011] The charging device determines the charging parameter for charging the battery device according to the charging demand information for indicating the charging demand power of the battery device and the discharging capability information of the energy storage device, and the charging power corresponding to the determined charging parameter is less than or equal to the charging demand power. In this way, on the one hand, the charging demand of the battery device can be met within the discharging capability range of the charging device; on the other hand, the purpose of small power input and large power output for charging the battery device is achieved without modifying the power grid, for example, without additionally configuring an external transformer or expanding the transformer of the power grid, so that the charging rate of the battery device can be improved at a relatively small construction cost.

[0012] In some embodiments, the charging power includes the discharging power of the energy storage device.

[0013] The above technical solution, the charging power includes the discharging power of the energy storage device, that is, part or all of the charging power is derived from the discharging power of the energy storage device, that is, the charging device can charge the battery device in multiple ways, such as the energy storage device charging the battery device alone, or the energy storage device and other components charging the battery device together. In this way, the charging device can flexibly use the appropriate charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0014] In some embodiments, the ratio of the rated energy of the energy storage device to the rated power is less than or equal to 1:3; and / or

[0015] The ratio of the rated energy of the energy storage device to the maximum discharging power is less than or equal to 1:4; and / or

[0016] The energy density of the energy storage device is greater than or equal to 380 watt-hours per liter.

[0017] The above technical solution, the energy storage device has a small rated energy and an energy density greater than or equal to 380 watt-hours per liter, that is, the energy storage device has a small capacity and a small volume, thereby saving the floor area of the energy storage device and reducing the size of the charging device. On the other hand, the maximum discharging power of the energy storage device is large, so that the charging device can provide super-charging capability without modifying the power grid, effectively reducing the construction cost of the charging device.

[0018] In some embodiments, the charging demand information includes charging mode information, in the case that the charging mode information includes first charging mode information, the charging demand power includes first charging demand power, and in the case that the charging mode information includes second charging mode information, the charging demand power includes second charging demand power.

[0019] The first charging demand power is greater than the second charging demand power.

[0020] The above technical solution provides two charging modes, and the charging demand powers corresponding to the two charging modes are different, so that the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation in the actual charging process, thereby effectively improving the charging efficiency.

[0021] In some embodiments, when the charging mode information includes the first charging mode information, the discharging power of the energy storage device includes a first discharging power, and when the charging mode information includes the second charging mode information, the discharging power of the energy storage device includes a second discharging power.

[0022] The first discharging power is greater than or equal to the second discharging power.

[0023] The above technical solution provides two charging modes, and the discharging powers corresponding to the two charging modes are different, so that the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation in the actual charging process, thereby effectively improving the charging efficiency.

[0024] In some embodiments, when the charging mode information includes the first charging mode information, the discharging rate of the energy storage device includes a first discharging rate, and when the charging mode information includes the second charging mode information, the discharging rate of the energy storage device includes a second discharging rate.

[0025] The first discharging rate is greater than the second discharging rate.

[0026] The above technical solution provides two charging modes, and the discharging rates corresponding to the two charging modes are different, so that the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation in the actual charging process, thereby effectively improving the charging efficiency.

[0027] In some embodiments, when the charging mode information includes the first charging mode information, the charging power includes a first charging power, and when the charging mode information includes the second charging mode information, the charging power includes a second charging power.

[0028] The first charging power is greater than the second charging power.

[0029] According to the discharging capability information and the switched charging mode, the charging parameter is determined.

[0030] The above technical solution provides two charging modes, and the charging powers corresponding to the two charging modes are different, so that the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation in the actual charging process, thereby effectively improving the charging efficiency.

[0031] In some embodiments, the charging device further comprises a power conversion device configured to charge the energy storage device by input power, the power conversion device comprising a rated power, the charging demand power being greater than the rated power, the charging power being greater than the rated power, and / or the discharging power of the energy storage device being greater than the rated power.

[0032] The charging demand power is greater than the rated power of the power conversion device, and / or the charging power is greater than the rated power of the power conversion device, and / or the discharging power is greater than the rated power of the power conversion device, which further achieves the purpose of charging the battery device with small power input and large power output, thereby greatly improving the charging rate of the battery device.

[0033] In some embodiments, when the discharging capability information meets the first preset condition, the control device is further configured to:

[0034] charge the battery device independently by the energy storage device;

[0035] When the discharging capability information meets the second preset condition, the control device is further configured to:

[0036] charge the battery device by the energy storage device and the power conversion device;

[0037] When the discharging capability information meets the third preset condition, the control device is further configured to:

[0038] charge the battery device independently by the power conversion device.

[0039] The above technical solution charges the battery device by different devices when the discharging capability information meets different preset conditions, that is, the charging device can flexibly use the appropriate charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0040] In some embodiments, the control device is specifically configured to:

[0041] determine the discharging capability information of the energy storage device according to the electrical parameters of the energy storage device, the discharging capability information indicating the maximum discharging power of the energy storage device.

[0042] The above technical solution determines the maximum discharging power of the energy storage device according to the electrical parameters of the energy storage device, and then determines the charging parameters for charging the battery device according to the maximum discharging power of the energy storage device, so that the determined charging parameters can meet the actual situation of the energy storage device, thereby the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0043] In some embodiments, the energy storage device comprises one or more energy storage modules, the energy storage module comprises one or more energy storage units, each energy storage unit has a first positive power supply end and a first negative power supply end, the one or more energy storage units are connected to a second positive power supply end and a second negative power supply end of the energy storage module through the first positive power supply end and the first negative power supply end, and the energy storage module is configured to provide a first direct current; a charging module connected to the second positive power supply end and the second negative power supply end of the energy storage module, the charging module is configured to be suitable for charging output based on the first direct current, the maximum charging output power of the charging module is greater than or equal to 350 kilowatts, and / or the rated charging output power of the charging module is greater than or equal to 290 kilowatts.

[0044] In the technical scheme of the embodiments of the present application, by configuring the energy storage unit inside the charging device without additional configuration of the transformer or expansion of the transformer, not only the fast charging of the charging device such as fast charging / ultra-fast charging can be realized, but also the cost caused by adding the transformer or expanding the transformer can be reduced.

[0045] In some embodiments, the charging device further comprises an input module, the input module is suitable for providing charging energy for each energy storage unit.

[0046] The input module can be adapted to provide charging energy for the energy storage unit. In different power consumption environments, whether it is an old city area with relatively tight power supply or a remote area sensitive to infrastructure construction cost, the charging device can realize fast charging function by cooperation of the input module and the energy storage module without relying on external complex power supply upgrade, thereby enhancing the applicability and flexibility of the charging device in various scenarios.

[0047] In some embodiments, the maximum output power of the input module is less than or equal to 150 kilowatts, and / or the rated output power of the input module is less than or equal to 125 kilowatts.

[0048] Limiting the maximum output power and / or rated power of the input module within the above range makes the charging device flexible to access the conventional power network. The output power of most public power grids or commercial power interfaces has certain limitations. The power setting of the input module can successfully obtain charging energy from the conventional power environment without modifying the existing power supply line, thereby improving the access feasibility of the charging device in various power consumption scenarios to facilitate the installation of the charging device. Moreover, the charging device can realize large-power charging under small-power input. During the power consumption peak period, when multiple power consumption devices are running simultaneously, the energy storage module supplies power to the multiple power consumption devices, and the input module stably charges the energy storage unit at a low power, which can effectively reduce the impact of the charging device on the power grid and help maintain the stability of the power grid.

[0049] In some embodiments, the ratio between the maximum charging output power of the charging module and the maximum output power of the input module is greater than 1 and less than or equal to 15, and / or the ratio between the rated charging output power of the charging module and the rated output power of the input module is greater than 1 and less than or equal to 15.

[0050] Thus, on the one hand, the current impact, overheating and other problems caused by the charging module due to instantaneous excessive power input can be reduced. On the other hand, the input module can charge the energy storage module at a small power, and the energy storage module can output to the charging module at a controllable large power, realizing small power input to the energy storage module and large power output of the charging module. In addition, the energy storage module can flexibly adjust the output power according to the amount of electricity stored and the power demand of the power consumption device, so that the charging device can reasonably distribute electric energy, reduce unnecessary energy consumption, improve the performance-price ratio of the charging device, and enable the charging device to run smoothly when charging at a small power and outputting at a large power.

[0051] In some embodiments, each energy storage unit includes a battery subunit, and the ratio between the rated output power of the input module and the rated energy of the battery subunit is greater than or equal to 1 / n1, where n1 is in the range of 1-4.

[0052] Thus, by regulating the rated output power of the input module to be greater than the rated energy of the battery subunit divided by the coefficient n1, the rated energy of the battery subunit is small when the input power of the input module 1 is small, so that the input power and the rated energy of the battery subunit are matched, and the output module will not charge the battery subunit too slowly, affecting the use of the energy storage unit. At the same time, the small rated energy of the battery subunit also means that the battery subunit has a small volume, so that the energy storage unit occupies a small area and is easy to install. Further, the small volume of the energy storage unit realizes small power input and large power output, and improves the user experience.

[0053] In some embodiments, each energy storage unit includes a battery subunit, and the ratio between the rated energy of the battery subunit and the rated charging output power of the charging module is greater than or equal to 1 / (n2*n3), where n2 is in the range of 94%-99% and n3 is in the range of 4-6.

[0054] This ensures charging performance while also ensuring the reliability of the charging device. When the rated energy of the battery subunit matches the rated charging output power of the charging module, the battery subunit can stably provide energy to the charging module during the charging process, reducing charging power instability or interruptions caused by insufficient energy supply. Taking n2 as an example, with a value of 94% and n3 as 6, the larger denominator requires the battery subunit to have a relatively high rated energy to match the power of the charging module. This allows the charging device to operate continuously and stably during long-term, high-power charging, reduces the probability of failure, lowers maintenance costs, and improves the cost-effectiveness of the charging device in terms of its service life.

[0055] In some embodiments, each energy storage unit includes a battery subunit, the ratio between the rated energy of the battery subunit and the rated power of the battery subunit is less than or equal to 1 / 3, and / or the volume energy density of the battery subunit is greater than or equal to 380 watt-hours / liter.

[0056] When the charging device outputs high power (the maximum charging output power of the charging module is above 350kW), the rated energy of the battery subunit is matched with the rated power, reducing grid fluctuations caused by the need for grid power supply due to insufficient rated energy of the battery subunit caused by high-power output. This is beneficial to improving the reliability and stability of the charging device. When the power output is high, the charging device can operate continuously and stably, reducing the probability of failure and lowering maintenance costs, thereby improving the cost-effectiveness from the perspective of the service life of the charging device.

[0057] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a single cell, the single cell includes an electrolyte, the electrolyte includes an electrolyte salt, the electrolyte salt includes lithium hexafluorophosphate, and the concentration of lithium hexafluorophosphate is in the range of 0.5 mol / L-1.0 mol / L.

[0058] By providing the electrolyte with lithium hexafluorophosphate at the above-mentioned concentration, the battery subunit has a higher ionic conductivity, thereby improving the charging rate of the charging device, and also making the battery subunit have higher interface stability and higher thermal stability; lithium hexafluorophosphate has a smaller effect on the severity of thermal runaway, so that the battery subunit has a suitable severity of thermal runaway and a lower risk of thermal diffusion, so that the charging device has higher reliability at a power output of more than 350 kW.

[0059] In some embodiments, the electrolyte further includes an organic solvent, and the organic solvent includes a carbonate solvent.

[0060] Adding carbonate solvents to the electrolyte can improve various properties of the battery subunits, for example, the charge and discharge efficiency, cycle performance, low temperature performance and high voltage stability of the battery subunits.

[0061] In some embodiments, the electrolyte salt further comprises a fluorine-containing sulfimide salt, and the concentration of the fluorine-containing sulfimide salt is in a range from 0.2 mol / L to 0.5 mol / L.

[0062] Since the fluorine-containing sulfimide salt has the characteristics of low viscosity and high ionic conductivity, the electrolyte comprising the fluorine-containing sulfimide salt in the above concentration is beneficial to improve the charging rate of the battery subunit, and further improve the charging rate of the charging device.

[0063] In some embodiments, the electrolyte further comprises an organic solvent, and the organic solvent comprises a chain carboxylic acid ester solvent, and the mass content A of the chain carboxylic acid ester solvent based on the total mass of the solvent satisfies: 5%≤A≤75%,

[0064] The chain carboxylic acid ester solvent comprises a compound having the following structure:

[0065]

[0066] R1 comprises at least one of a hydrogen atom, a C1-C5 alkyl group or a C1-C5 haloalkyl group, and R2 comprises a C1-C5 alkyl group and / or a C1-C5 haloalkyl group.

[0067] In the technical solution, the solvent comprises a carboxylic acid ester solvent, so that the electrolyte can have higher ionic conductivity and relatively lower viscosity, which is beneficial to further improve the rapid charging performance of the charging device, such as the fast charging performance and / or the super charging performance.

[0068] In some embodiments, 40%≤A≤75%.

[0069] Setting A to be greater than or equal to 40% and less than or equal to 75% can better achieve the purpose of rapid charging of the charging device.

[0070] In some embodiments, each energy storage unit comprises a battery subunit, the battery subunit comprises a single battery cell, the single battery cell comprises a negative electrode sheet, the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, and the negative electrode active material comprises a carbon-based material, the carbon-based material comprising at least one of natural graphite and artificial graphite.

[0071] Using at least one of natural graphite and artificial graphite as the carbon-based material of the negative electrode active material, both of which have good electrical conductivity and high theoretical specific capacity. Natural graphite has high crystallinity and regular layered structure, which is beneficial to the rapid embedding and extraction of lithium ions, thereby improving the charging and discharging efficiency of the battery; artificial graphite can accurately adjust its microstructure and performance by controlling the production process, thereby enhancing the cycle stability of the battery and prolonging the service life of the battery.

[0072] In some embodiments, the volume average particle size Dv50 of the negative electrode film layer is in a range of 8.2 μm-13.5 μm.

[0073] Thus, the particle size range can balance the specific surface area and the compaction density. Smaller particle size can provide larger specific surface area, increase the reaction sites of lithium ions, and improve the charge-discharge rate performance of the battery; and appropriate particle size can ensure higher compaction density, reduce the voids between active materials, and improve the energy density of the battery, so that the battery achieves a good balance between the rate performance and the energy density.

[0074] In some embodiments, the negative electrode film layer includes a first negative electrode active material layer and a second negative electrode active material layer arranged in a stack, the first negative electrode active material layer is located on the side close to the negative electrode current collector, the volume average particle size Dv50 of the negative electrode active material in the first negative electrode active material layer is 9.5 μm-18.5 μm, and the volume average particle size Dv50 of the negative electrode active material in the second negative electrode active material layer is 7.8 μm-14.3 μm.

[0075] When the volume average particle size Dv50 of the negative electrode active material in the first negative electrode active material layer and the volume average particle size Dv50 of the negative electrode active material in the second negative electrode active material layer are in the above range, on the one hand, the solid-phase transmission path of lithium ions can be shortened, and the rapid charging performance can be improved, and on the other hand, the material is not prone to agglomeration during the preparation process, and the stability of the material can be improved. The negative electrode active material in the second negative electrode active material layer and the negative electrode active material in the first negative electrode active material layer in the above volume average particle size range cooperate, which is conducive to constructing the gradient pore difference of the second negative electrode active material layer and the first negative electrode active material layer, reducing the tortuosity of lithium ion transmission, and improving the rapid charging performance of the battery monomer.

[0076] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a monomer battery cell, the monomer battery cell includes a negative electrode sheet, the negative electrode sheet includes a negative electrode current collector and at least a negative electrode film layer located on one side of the negative electrode current collector, and the negative electrode film layer includes a negative electrode active material layer.

[0077] The compaction density of the negative electrode film layer is 1.15 g / cm 3 -1.36 g / cm 3 at 100% state of charge, and / or the single-sided coating weight of the negative electrode film layer is 0.09 g / 15 40.25 mm 2 -0.17 g / 15 40.25 mm 2 .

[0078] The compaction density of the positive electrode film layer in the above range is beneficial to improve the energy density of the battery monomer, and because the positive electrode active material in the positive electrode film layer is packed more closely, the contact resistance between particles is smaller, which can further reduce the resistance of the pole piece, thereby reducing the heat generation. When the single-sided coating weight of the positive electrode film layer is in the above range, the heat generation per unit area of the positive electrode pole piece will not be too large, and the energy density of the battery monomer can be improved.

[0079] In some embodiments, each energy storage unit comprises a battery subunit, the battery subunit comprises a monomer battery cell, the monomer battery cell comprises a positive electrode pole piece, the positive electrode pole piece comprises a positive electrode current collector and a positive electrode film layer at least on one side of the positive electrode current collector, and the positive electrode film layer comprises a positive electrode active material layer.

[0080] The compaction density of the positive electrode film layer is 2.5 g / cm 3 -2.8 g / cm 3 .

[0081] The compaction density of the positive electrode film layer in the above range is beneficial to improve the energy density of the battery monomer, and because the positive electrode active material in the positive electrode film layer is packed more closely, the contact resistance between particles is smaller, which can further reduce the resistance of the pole piece, thereby reducing the heat generation.

[0082] In some embodiments, the single-sided coating weight of the positive electrode film layer is 0.2 g / 15 40.25 mm 2 -0.37 g / 15 40.25 mm 2 .

[0083] The single-sided coating weight of the positive electrode film layer in the above range will not cause excessive heat generation per unit area of the positive electrode pole piece, and the energy density of the battery monomer can be improved.

[0084] In some embodiments, each energy storage unit comprises a battery subunit, the battery subunit comprises a monomer battery cell, the monomer battery cell comprises a positive electrode pole piece, the positive electrode pole piece comprises a positive electrode current collector and a positive electrode film layer at least on one side of the positive electrode current collector, and the thickness of the positive electrode current collector is 10 μm-15 μm.

[0085] The thickness of the positive electrode current collector in the above range is excellent in flow capacity, and the battery monomer has a high energy density.

[0086] In some embodiments, each energy storage unit comprises a battery subunit, the battery subunit comprises a monomer battery cell, the monomer battery cell comprises a separator film, and the separator film comprises a base film with a porous structure, and the porosity of the base film is 20% to 70%.

[0087] When the porosity of the base film is in the above range, the migration ability of lithium ions in the separator film can be improved, and the internal resistance of the battery cell can be reduced, thereby reducing heat generation.

[0088] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode film layer disposed on at least one side of the positive electrode current collector, the positive electrode film layer includes a positive electrode active material, and the positive electrode active material includes a lithium-containing phosphate;

[0089] The lithium-containing phosphate includes phosphate particles and a coating layer, the coating layer coats at least part of the surface of the phosphate particles, and the coating layer includes one or more of C, Fe, Ti, Zr, Hf, Ge, and Sn.

[0090] In this technical solution, the positive electrode coating layer has excellent ion and electron conductivity, which can improve the ion conductivity and electron conductivity of the positive electrode active material, thereby effectively improving the charge rate of the battery subunit and the rapid charging performance of the charging device, and facilitating the improvement of the rapid charging performance of the battery device.

[0091] In some embodiments, the coating layer includes a fast ion conductor, wherein the fast ion conductor includes a compound with a general formula of Li 3-d Fe 2- d M 2d (PO4)3, M2 includes at least one of Ti, Zr, Hf, Ge, and Sn, and 0≤d≤1.

[0092] Since the fast ion conductor has high ion conductivity, it is beneficial to the diffusion and transmission of lithium ions, and thus the charge rate of the battery subunit and the rapid charging performance of the charging device can be further improved, which is beneficial to the improvement of the rapid charging performance of the battery device.

[0093] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector, a positive electrode conductive layer, and a positive electrode film layer, the positive electrode film layer is disposed on at least one side of the positive electrode current collector, the positive electrode conductive layer is located between the positive electrode current collector and the positive electrode film layer, and the thickness of the positive electrode conductive layer is in the range of 0.5 μm-2 μm.

[0094] In this way, the diffusion path of lithium ions can be shortened, thereby improving the rate performance of the battery subunit and facilitating the improvement of the rapid charging performance of the battery device.

[0095] In some embodiments, the positive electrode conductive layer includes a positive electrode conductive agent, and the mass content of the positive electrode conductive agent is in the range of 30%-50% based on the total mass of the positive electrode conductive layer.

[0096] The mass content of the positive electrode conductive agent is set to be in the range of 30%-50%, which can improve the electron transmission efficiency in the positive electrode sheet, and further improve the rate performance of the battery subunit.

[0097] In some embodiments, the positive electrode conductive layer includes a positive electrode binder, and the mass content of the positive electrode binder is in the range of 50%-70% based on the total mass of the positive electrode conductive layer.

[0098] The mass content of the positive electrode binder is set to be in the range of 50%-70%, which can reduce the possibility of cracking or peeling of the positive electrode sheet during the cycle process, and further improve the cycle life of the battery subunit.

[0099] In some embodiments, each energy storage unit includes a battery subunit, and the battery subunit includes a negative electrode sheet, the negative electrode sheet includes a negative electrode current collector, a negative electrode conductive layer and a negative electrode film layer, the negative electrode film layer is arranged on at least one side of the negative electrode current collector, and the negative electrode conductive layer is located between the negative electrode current collector and the negative electrode film layer, and the thickness of the negative electrode conductive layer is in the range of 0.5-2 μm.

[0100] In this way, the diffusion path of lithium ions can be shortened, thereby improving the rate performance of the battery subunit and facilitating the improvement of the rapid charging performance of the battery device.

[0101] In some embodiments, the negative electrode conductive layer includes a negative electrode conductive agent, and the mass content of the negative electrode conductive agent is in the range of 20%-40% based on the total mass of the negative electrode conductive layer.

[0102] The mass content of the negative electrode conductive agent is set to be in the range of 20%-40%, which can improve the electron transmission efficiency in the negative electrode sheet, and further improve the rate performance of the battery subunit and facilitate the improvement of the rapid charging performance of the battery device.

[0103] In some embodiments, the negative electrode conductive layer includes a negative electrode binder, and the mass content of the negative electrode binder is in the range of 60%-80% based on the total mass of the negative electrode conductive layer.

[0104] The mass content of the negative electrode binder is set to be in the range of 60%-80%, which can reduce the possibility of cracking or peeling of the negative electrode sheet during the cycle process, and further improve the cycle life of the battery subunit and facilitate the improvement of the cycle life of the battery device.

[0105] In a second aspect, the present application provides a charging pile including the charging device of the first aspect.

[0106] Since the charging pile includes all the technical features of the charging device of the first aspect, the effects are the same as described above, and will not be repeated here.

[0107] In a third aspect, the present application provides a charging method applied to a charging device, the charging device comprising an energy storage module, the charging device being configured to charge a battery device through the energy storage module, the charging method comprising: determining charging demand information of the battery device, the charging demand information being used to indicate a charging demand power of the battery device; determining discharge capability information of the energy storage module; determining charging parameters of the charging device according to the discharge capability information and the charging demand information; and charging the battery device according to the charging parameters, the charging power corresponding to the charging parameters being less than or equal to the charging demand power.

[0108] In the embodiments of the present application, the charging device determines the charging parameters for charging the battery device according to the charging demand information used to indicate the charging demand power of the battery device and the discharge capability information of the energy storage module, and the charging power corresponding to the charging parameters is less than or equal to the charging demand power. In this way, on the one hand, the charging demand of the battery device can be met within the discharge capability range of the charging device; on the other hand, the purpose of small-power input and large-power output for charging the battery device is achieved without modifying the power grid, for example, without additionally configuring an external transformer or expanding the transformer of the power grid, so that the charging rate of the battery device can be improved at a relatively small construction cost.

[0109] In some embodiments, the charging power comprises the discharge power of the energy storage module.

[0110] In the above technical solution, the charging power comprises the discharge power of the energy storage module, that is, part or all of the charging power is derived from the discharge power of the energy storage module, that is, the charging device can charge the battery device in multiple ways, such as charging the battery device by the energy storage module alone or charging the battery device by the energy storage module and other components together. In this way, the charging device can flexibly use appropriate charging methods to charge the battery device according to actual conditions, thereby effectively improving the charging efficiency.

[0111] In some embodiments, the ratio of the rated energy of the energy storage module to the rated power is less than or equal to 1:3; and / or the ratio of the rated energy of the energy storage module to the maximum discharge power is less than or equal to 1:4; and / or the energy density of the energy storage module is greater than or equal to 380 watt-hours per liter.

[0112] In the above technical solution, the rated energy of the energy storage module is small and the energy density is greater than or equal to 380 watt-hours per liter, that is, the capacity of the energy storage module is small and the volume is also small, thereby saving the floor area of the energy storage module and reducing the size of the charging device. On the other hand, the maximum discharge power of the energy storage module is large, so that the charging device can provide super-charging capability without modifying the power grid, effectively reducing the construction cost of the charging device.

[0113] In some embodiments, the charging demand information comprises charging mode information, the charging demand power comprises a first charging demand power in a case where the charging mode information comprises first charging mode information, and the charging demand power comprises a second charging demand power in a case where the charging mode information comprises second charging mode information; wherein the first charging demand power is greater than the second charging demand power.

[0114] The above technical solution provides two charging modes, and the charging demand powers corresponding to the two charging modes are different. In this way, in the actual charging process, the charging device can flexibly use a suitable charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0115] In some embodiments, the discharging power of the energy storage module comprises a first discharging power in a case where the charging mode information comprises the first charging mode information, and the discharging power of the energy storage module comprises a second discharging power in a case where the charging mode information comprises the second charging mode information; wherein the first discharging power is greater than or equal to the second discharging power.

[0116] The above technical solution provides two charging modes, and the discharging powers corresponding to the two charging modes are different. In this way, in the actual charging process, the charging device can flexibly use a suitable charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0117] In some embodiments, the discharging rate of the energy storage module comprises a first discharging rate in a case where the charging mode information comprises the first charging mode information, and the discharging rate of the energy storage module comprises a second discharging rate in a case where the charging mode information comprises the second charging mode information; wherein the first discharging rate is greater than the second discharging rate.

[0118] The above technical solution provides two charging modes, and the discharging rates corresponding to the two charging modes are different. In this way, in the actual charging process, the charging device can flexibly use a suitable charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0119] In some embodiments, the charging power comprises a first charging power in a case where the charging mode information comprises the first charging mode information, and the charging power comprises a second charging power in a case where the charging mode information comprises the second charging mode information; wherein the first charging power is greater than the second charging power.

[0120] The above technical solution provides two charging modes, and the charging powers corresponding to the two charging modes are different. In this way, in the actual charging process, the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0121] In some embodiments, the determining the charging demand information of the battery device includes: receiving the charging mode information input by a user, the charging mode information being used to indicate a charging mode selected by the user for charging the battery device.

[0122] The above technical solution obtains the charging mode information of the battery device by receiving the charging mode information input by the user. In this way, the charging mode information obtained in this way is associated with the relevant situation of the user at the current time. For example, if the user has no much time to wait for the charging device to charge the battery device at the current time, the user selects a charging mode with a larger power, thereby effectively improving the user experience.

[0123] In some embodiments, the charging method further includes: determining whether the charging mode matches the charging device and / or whether the charging mode matches the battery device; in the case that the charging mode does not match the charging device and / or the charging mode does not match the battery device, sending switching information, the switching information being used to indicate switching of the charging mode; and the determining the charging parameter of the charging device according to the discharging capability information and the charging demand information includes: determining the charging parameter according to the discharging capability information and the switched charging mode.

[0124] The above technical solution determines whether the charging mode matches the charging device and / or whether the charging mode matches the battery device after receiving the charging mode, and sends switching information used to indicate switching of the charging mode in the case of mismatch, so that the finally determined charging mode can be more matched with the charging device and the battery device, thereby improving the effect of charging the battery device and improving the user experience.

[0125] In some embodiments, the charging demand information includes charging electric quantity information, and the charging electric quantity information includes one or more of the following information: charging time length, charging electric quantity, target electric quantity of the battery device, and charging cost; and the charging method further includes: stopping charging the battery device in the case that the charging operation matches the charging electric quantity information.

[0126] In the above technical solution, the charging requirement information includes one or more of the following: charging duration, charging capacity, target battery capacity, and charging cost. That is, the charging requirement information can include multiple charging-related parameters. Thus, the charging parameters determined based on the charging requirement information are more accurate, and thus, the charging efficiency of the battery device based on these charging parameters is higher.

[0127] In some embodiments, the charging device further includes a power conversion device, which is configured to charge the energy storage module through input power, the power conversion device includes a rated power, the charging demand power is greater than the rated power, the charging power is greater than the rated power, and / or the discharge power of the energy storage module is greater than the rated power.

[0128] In the above technical solution, the charging demand power is greater than the rated power of the power conversion device, and / or the charging power is greater than the rated power of the power conversion device, and / or the discharge power is greater than the rated power of the power conversion device, which further realizes the purpose of charging the battery device with small power input and high power output, thereby greatly improving the charging rate of the battery device.

[0129] In some embodiments, the required charging power is greater than 3 times the rated power; and / or the charging power is greater than 3 times the rated power; and / or the discharge power of the energy storage module is greater than 3 times the rated power.

[0130] In the above technical solution, the required charging power is greater than 3 times the rated power, and / or the charging power is greater than 3 times the rated power, and / or the discharging power is greater than 3 times the rated power, so that the charging device can further obtain a larger power output with a smaller power input, thereby greatly improving the charging rate of the battery device.

[0131] In some embodiments, when the discharge capacity information meets a first preset condition, charging the battery device includes: independently charging the battery device through the energy storage module; when the discharge capacity information meets a second preset condition, charging the battery device includes: charging the battery device through the energy storage module and the power conversion device; when the discharge capacity information meets a third preset condition, charging the battery device includes: independently charging the battery device through the power conversion device.

[0132] In the above technical solution, when the discharge capacity information meets different preset conditions, the charging device charges the battery device through different means. That is, the charging device can flexibly use a suitable charging method to charge the battery device according to actual conditions, thereby effectively improving the charging efficiency.

[0133] In some embodiments, the discharge capability information comprises a state of charge of the energy storage module; the discharge capability information satisfies a first preset condition, comprising: the state of charge belongs to a first state of charge range; and / or the discharge capability information satisfies a second preset condition, comprising: the state of charge belongs to a second state of charge range; and / or the discharge capability information satisfies a third preset condition, comprising: the state of charge belongs to a third state of charge range.

[0134] The above technical solution determines the component in the charging device that charges the battery device according to the state of charge of the energy storage module, so that the determined power supply conforms to the actual situation of the energy storage module, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0135] In some embodiments, the discharge capability information comprises an energy state of the energy storage module; the discharge capability information satisfies a first preset condition, comprising: the energy state belongs to a first energy state range; and / or the discharge capability information satisfies a second preset condition, comprising: the energy state belongs to a second energy state range; and / or the discharge capability information satisfies a third preset condition, comprising: the energy state belongs to a third energy state range.

[0136] The above technical solution determines the component in the charging device that charges the battery device according to the energy state of the energy storage module, so that the determined power supply conforms to the actual situation of the energy storage module, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0137] In some embodiments, the discharge capability information indicates a maximum discharge power of the energy storage module; the discharge capability information satisfies a first preset condition, comprising: the maximum discharge power belongs to a first power range; and / or the discharge capability information satisfies a second preset condition, comprising: the maximum discharge power belongs to a second power range; and / or the discharge capability information satisfies a third preset condition, comprising: the maximum discharge power belongs to a third power range.

[0138] The above technical solution determines the component in the charging device that charges the battery device according to the maximum discharge power of the energy storage module, so that the determined power supply conforms to the actual situation of the energy storage module, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0139] In some embodiments, the determining the discharge capability information of the energy storage module comprises: determining the discharge capability information of the energy storage module according to the electrical parameter of the energy storage module, the discharge capability information indicating a maximum discharge power of the energy storage module.

[0140] The technical solution determines the maximum discharge power of the energy storage module according to the electrical parameter of the energy storage module, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage module, so that the determined charging parameter can conform to the actual situation of the energy storage module, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0141] In some embodiments, when the electrical parameter meets a fourth preset condition, the maximum discharge power includes a first maximum discharge power; when the electrical parameter meets a fifth preset condition, the maximum discharge power includes a second maximum discharge power; and when the electrical parameter meets a sixth preset condition, the maximum discharge power includes a third maximum discharge power; wherein the maximum discharge power is in descending order as follows: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0142] In some embodiments, the electrical parameter includes a state of charge of the energy storage module; the electrical parameter meets the fourth preset condition, including that the state of charge belongs to a fourth state of charge range; and / or the electrical parameter meets the fifth preset condition, including that the state of charge belongs to a fifth state of charge range; and / or the electrical parameter meets the sixth preset condition, including that the state of charge belongs to a sixth state of charge range.

[0143] The technical solution determines the maximum discharge power of the energy storage module according to the state of charge of the energy storage module, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage module, so that the determined charging parameter can conform to the current state of the energy storage module, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0144] In some embodiments, the electrical parameter includes an energy state of the energy storage module; the electrical parameter meets the fourth preset condition, including that the energy state belongs to a fourth energy state range; and / or the electrical parameter meets the fifth preset condition, including that the energy state belongs to a fifth energy state range; and / or the electrical parameter meets the sixth preset condition, including that the energy state belongs to a sixth state of charge range.

[0145] The technical solution determines the maximum discharge power of the energy storage module according to the energy state of the energy storage module, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage module, so that the determined charging parameter can conform to the current state of the energy storage module, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0146] In some embodiments, the charging power is greater than or equal to 100 kW, and / or the charging demand power is greater than or equal to 300 kW.

[0147] The charging power is greater than or equal to 100 kW, and / or the charging demand power is greater than or equal to 300 kW, which further realizes the purpose of small power input and large power output for charging the battery device, and further improves the charging rate of the battery device to a large extent.

[0148] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0149] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered limiting the present application. Moreover, the same reference numbers are used to represent the same components throughout the drawings. In the drawings:

[0150] Figure 1 A schematic diagram of an application scenario of an embodiment of the present application is shown.

[0151] Figure 2 A schematic flow chart of a charging method of an embodiment of the present application is shown.

[0152] Figure 3 A schematic diagram of a charging method of an embodiment of the present application is shown.

[0153] Figure 4 A schematic diagram of a charging method of an embodiment of the present application is shown.

[0154] Figure 5 A schematic diagram of a charging method of an embodiment of the present application is shown.

[0155] Figure 6 A schematic block diagram of a charging device of an embodiment of the present application is shown.

[0156] Figure 7 A schematic block diagram of another charging device of an embodiment of the present application is shown.

[0157] Figure 8 A schematic diagram of a charging device of an embodiment of the present application is shown.

[0158] Figure 9 This is a schematic structural diagram of a charging device with an input module according to an embodiment of the present application.

[0159] Figure 10 This is a schematic structural diagram of a charging device with energy storage units connected in parallel according to an embodiment of the present application.

[0160] Figure 11a This is a schematic structural diagram of an energy storage unit according to an embodiment of the present application, including a charging device for a battery subunit.

[0161] Figure 11b This is a structural schematic diagram of a charging device in which an energy storage unit according to an embodiment of the present application includes a battery subunit and a first power conversion subunit.

[0162] Figure 11c This is a schematic structural diagram of a charging device in which an energy storage unit according to an embodiment of the present application includes a battery subunit and a first switch subunit.

[0163] Figure 11d This is a structural diagram of a charging device in which an energy storage unit according to an embodiment of the present application includes a battery subunit, a first power conversion subunit and a first switch subunit.

[0164] Figure 12a This is a structural diagram of a charging device including an input interface in an input module according to an embodiment of the present application.

[0165] Figure 12b This is a structural diagram of a charging device in which an input module according to an embodiment of the present application includes a second power conversion sub-unit.

[0166] Figure 13a This is a schematic structural diagram of a charging device in which charging guns do not share a common load according to an embodiment of the present application.

[0167] Figure 13b This is a schematic structural diagram of a charging device for charging guns sharing a common load according to an embodiment of the present application.

[0168] Figure 14 Schematic diagram of the structure of a charging device with a selection unit according to an embodiment of the present application.

[0169] Figure 15 for Figure 14 A schematic structural diagram of a charging device having a second positive power supply terminal is shown.

[0170] Figure 16a for Figure 15 The diagram shows the structure of a charging device with a second positive power supply terminal and charging guns that do not share a negative connection.

[0171] Figure 16b for Figure 15Structure diagram of charging device with one second positive power supply end and charging gun not sharing negative.

[0172] Figure 17 For Figure 14 Structure diagram of charging device with multiple second positive power supply ends.

[0173] Figure 18a For Figure 17 Structure diagram of charging device with multiple second positive power supply ends and charging gun not sharing negative.

[0174] Figure 18b For Figure 17 Structure diagram of charging device with multiple second positive power supply ends and charging gun sharing negative.

[0175] Figure 19a For Figure 14 Structure diagram of charging device with selection unit and input module including ninth power conversion subunit.

[0176] Figure 19b For Figure 14 Structure diagram of charging device with selection unit and input module including multiple tenth power conversion subunits.

[0177] Figure 20 Structure diagram of charging device with wireless communication module according to an embodiment of the present application.

[0178] Figure 21 Structure diagram of charging device with energy storage units in series, each energy storage unit including bidirectional DCDC subunit, and charging gun not sharing negative according to an embodiment of the present application.

[0179] Figure 22 Structure diagram of charging device with energy storage units in series, each energy storage unit including bidirectional DCDC subunit, and charging gun sharing negative according to an embodiment of the present application.

[0180] Figure 23 Structure diagram of charging device with energy storage units in parallel, each energy storage unit including bidirectional DCDC subunit, and charging gun not sharing negative according to an embodiment of the present application.

[0181] Figure 24 Structure diagram of charging device with energy storage units in parallel, each energy storage unit including bidirectional DCDC subunit, and charging gun sharing negative according to an embodiment of the present application.

[0182] Figure 25 Structure diagram of charging device with energy storage units in series, part of energy storage units including bidirectional DCDC subunit, and charging gun not sharing negative according to an embodiment of the present application.

[0183] Figure 26 Structure diagram of a charging device with series connection of energy storage units, partial energy storage units each including a bidirectional DCDC subunit and a common negative of a charging gun, according to an embodiment of the present application.

[0184] Figure 27 Structure diagram of a charging device with parallel connection of energy storage units each including a first switch subunit and a non-common negative of a charging gun, according to an embodiment of the present application.

[0185] Figure 28 Structure diagram of a charging device with three-phase electricity and a non-common negative of a charging gun, according to an embodiment of the present application, and a bidirectional ACDC subunit.

[0186] Figure 29 Structure diagram of a charging device with three-phase electricity and a common negative of a charging gun, according to an embodiment of the present application, and a bidirectional ACDC subunit.

[0187] Figure 30 Structure diagram of a single cell, according to some embodiments of the present application.

[0188] Figure 31 Explosion diagram of a single cell, according to some embodiments of the present application.

[0189] Figure 32 Structure diagram of a battery module, according to some embodiments of the present application.

[0190] Figure 33 Structure diagram of a battery pack, according to some embodiments of the present application.

[0191] Figure 34 Structure diagram of an electrical equipment, according to some embodiments of the present application.

[0192] Figure 35 Structure diagram of a charging pile, according to an embodiment of the present application.

[0193] Figure 36 Structure diagram of a charging and storage system, according to an embodiment of the present application.

[0194] Figure 37 Structure diagram of a charging and storage system with multiple charging devices sharing a DC bus, according to an embodiment of the present application.

[0195] Figure 38 Structure diagram of a charging and storage system with multiple charging devices sharing a DC bus, according to another embodiment of the present application.

[0196] Figure 39Structure diagram of charging device shared AC bus charging and storage system of one embodiment of the present application.

[0197] Reference signs are explained as follows:

[0198] 100, charging device; 1010, energy storage device; 110, energy storage module; 120, charging module; 121, third power conversion subunit; 122, charging gun; 123, fourth power conversion subunit; 124, fifth power conversion subunit; 125, sixth power conversion subunit; 130, input module; 140, wireless communication module; 111, selection unit; 210, first external power supply; 220, second external power supply; 131, second power conversion subunit; 132, ninth power conversion subunit; 140, bidirectional DC / DC converter module; 151 / 152, insulation detection module; 160, electric meter; 170, thermal management system; 180, low-voltage power supply module; 190, AC / DC converter; 1020, control device; 1001, memory; 1002, processor; 1003, communication interface; 1004, bus;

[0199] 1, electric device; 2, battery pack; 3, controller; 4, motor; 5, box body; 5a, first box body part; 5b, second box body part; 5c, containing space; 6, battery module;

[0200] 7, single cell;

[0201] 10, electrode assembly; 11, first tab; 13, second tab; 12, main body part;

[0202] 20, outer shell; 21, housing; 22, end cover;

[0203] 31, first electrode terminal; 32, second electrode terminal;

[0204] 400, charging method;

[0205] 500, electrical system. DETAILED DESCRIPTION

[0206] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0207] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0208] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0209] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0210] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0211] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0212] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0213] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "linking", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0214] With the development of the times, electric vehicles have great market prospects and can effectively promote energy saving and emission reduction due to their high environmental protection, low noise, low use cost and other advantages, which are conducive to the development and progress of the society. The charging speed of electric vehicles affects the development and application of electric vehicles, and affects the acceptance of electric vehicles by the public.

[0215] Generally, if you want to improve the charging speed of the electric vehicle, you need to configure an external transformer for the charging pile or expand the transformer, which will increase more costs, which is not conducive to the promotion of the charging pile, and will affect the charging experience of the user, resulting in that the development and application of the electric vehicle are greatly limited.

[0216] In view of this, the embodiments of the present application provide a charging method which can effectively improve the charging speed of the battery device at a lower cost.

[0217] Figure 1 An application scenario of the embodiments of the present application is shown. Figure 1 The electrical system 500 shown can include lightning protection devices SPD1-SPD4, switch devices QF1-QF5, a thermal management system 170, a low-voltage power supply module 180, an alternating current / direct current (AC / DC) converter 190, fuse devices FU1 and FU2, switch devices K1-K3, a bidirectional direct current / direct current (DC / DC) converter module 140, an energy storage device 1010, insulation detection modules 151 and 152, an electricity meter 160 and a charging module 120. The charging module is, for example, a charging gun which can be configured to be connected with a battery device, for example, a power battery device in a vehicle, so as to charge the battery device through the charging gun. Figure 1 The electrical system 500 shown charges the power battery device.

[0218] The low-voltage power supply module 180 may be an electrically isolated AC / DC converter, and is used to supply power to components such as an energy management system (EMS), a CCU, and a battery management system (BMS).

[0219] The AC / DC converter 190 may be a bidirectional AC / DC converter. For example, the grid can supply power to the battery device connected to the charging module 120 via the bidirectional AC / DC converter, and the battery device can also supply power to the grid via the bidirectional AC / DC converter.

[0220] Figure 1 In the application scenario shown, the electrical system 500 can obtain alternating current (AC) from the power grid and convert it into direct current (DC) via the AC / DC converter 190 to charge the energy storage device 1010. The converted DC power can also be provided to the charging module 120 to charge the battery. The power grid is, for example, a system that can provide electricity, including mains power.

[0221] The insulation detection module 151 is used to detect the insulation resistance of the energy storage device 1010 , and the insulation detection module 152 is used to detect the insulation resistance of the charging module 120 .

[0222] When the electrical system 500 operates normally, the switch devices QF1 - QF5 are in a closed state, and the low-voltage power supply module 180 operates normally.

[0223] It is worth mentioning that Figure 1 The electrical system in the embodiment is an example of an application scenario of the present disclosure. Figure 1 The addition or reduction of components in the electrical system does not constitute a limitation on the embodiments of the present disclosure, and those skilled in the art can add and / or reduce devices in the electrical system as needed.

[0224] Figure 2 A schematic flow chart of a charging method 400 according to an embodiment of the present application is shown. The charging method 400 may be applied to a charging device, which may include an energy storage device, and the charging device is configured to charge a battery device via the energy storage device.

[0225] The charging method 400 may include at least part of the following contents.

[0226] S210: Determine charging requirement information of the battery device, where the charging requirement information is used to indicate the required charging power of the battery device.

[0227] S220: Determine discharge capacity information of the energy storage device.

[0228] S230: determining the charging parameter of the charging device according to the discharging capability information and the charging demand information.

[0229] S240: charging the battery device according to the charging parameter, the charging power corresponding to the charging parameter being less than or equal to the charging demand power.

[0230] In the embodiments of the present application, the charging device determines the charging parameter for charging the battery device according to the charging demand information for indicating the charging demand power of the battery device and the discharging capability information of the energy storage device, and the charging power corresponding to the determined charging parameter is less than or equal to the charging demand power. In this way, on the one hand, the charging demand of the battery device can be met within the discharging capability range of the charging device; on the other hand, the purpose of small-power input and large-power output for charging the battery device is achieved without modifying the power grid, for example, without additionally configuring an external transformer or expanding the transformer of the power grid, so that the charging rate of the battery device can be improved at a relatively small construction cost.

[0231] The battery device can be an electrical equipment. For example, it can be an electric vehicle, a ship or a spacecraft, etc. Alternatively, the battery device can be another energy storage device different from the foregoing energy storage device, and the state of charge (SOC) of the other energy storage device is relatively small.

[0232] In some embodiments, the ratio of the rated energy to the rated power of the energy storage device can be less than or equal to 1:3, and / or the ratio of the rated energy to the maximum discharging power of the energy storage device can be less than or equal to 1:4, and / or the energy density of the energy storage device can be greater than or equal to 380 Wh / L.

[0233] For example, the ratio of the rated energy to the rated power of the energy storage device can be less than or equal to 1:4, 1:5, 1:6, 1:7 or 1:8, etc.

[0234] For example, the ratio of the rated energy to the maximum discharging power of the energy storage device can be less than or equal to 1:5, 1:6, 1:7, 1:8, 1:9 or 1:10, etc.

[0235] For example, the energy density of the energy storage device can be greater than or equal to 400 Wh / L, 450 Wh / L, 500 Wh / L, 550 Wh / L, 600 Wh / L or 700 Wh / L, etc.

[0236] Alternatively, the ratio of the rated energy of the energy storage device to the maximum charging power of the charging device can be less than or equal to 1:4. For example, it can be less than or equal to 1:5, 1:6, 1:7, 1:8, 1:9 or 1:10, etc.

[0237] It should be noted that in the embodiments of the present application, the unit of energy is watt-hour, and the unit of power is watt. In addition, the ratio in the embodiments of the present application refers to the numerical ratio.

[0238] In some embodiments, the energy storage device includes one or more energy storage modules. In the case that the energy storage device includes multiple energy storage modules, the multiple energy storage modules can be connected in series, in parallel, or in a hybrid manner. The energy storage module is, for example, an electric box.

[0239] In some embodiments, the energy storage module includes one or more battery sub-units. In the case that the energy storage module includes multiple battery sub-units, the multiple battery sub-units can be connected in series, in parallel, or in a hybrid manner. The battery sub-unit is, for example, a single battery cell.

[0240] Optionally, the ratio of the rated energy to the rated power of the energy storage module can also be less than or equal to 1:3, and / or the ratio of the rated energy to the maximum discharge power of the energy storage module can also be less than or equal to 1:4, and / or the energy density of the energy storage module can be greater than or equal to 380 watt-hours per liter.

[0241] Similarly, the ratio of the rated energy to the rated power of the battery sub-unit can also be less than or equal to 1:3, and / or the ratio of the rated energy to the maximum discharge power of the battery sub-unit can also be less than or equal to 1:4, and / or the energy density of the battery sub-unit can be greater than or equal to 380 watt-hours per liter.

[0242] As an example, the energy storage device includes 2-6 electric boxes, each electric box includes 10-100 single battery cells, and each electric box can store 80 kilowatt-hours to 150 kilowatt-hours of electricity.

[0243] The above technical solutions have the following advantages. The rated energy of the energy storage device is small and the energy density is greater than or equal to 380 watt-hours per liter, that is, the capacity of the energy storage device is small and the volume is also small, thereby saving the floor area of the energy storage device and reducing the size of the charging device. On the other hand, the maximum discharge power of the energy storage device is large, so that the charging device can provide super-charging capability without modifying the power grid, effectively reducing the construction cost of the charging device.

[0244] In some embodiments, the charging power can be greater than or equal to 100 kW. For example, the charging power can be greater than or equal to 120 kW, 150 kW, 180 kW, 200 kW, 250 kW, 300 kW, 350 kW, 400 kW, etc.

[0245] The charging demand power can be greater than or equal to 300 kW. For example, the charging demand power can be greater than or equal to 320 kW, 360 kW, 400 kW, 450 kW, 480 kW, 500 kW, 550 kW, 600 kW, etc.

[0246] Thus, the purpose of charging the battery device with small power input and large power output is further achieved, and the charging rate of the battery device is further improved to a greater extent.

[0247] In some embodiments, the charging demand information can include charging mode information, in a case where the charging mode information includes first charging mode information, the charging demand power includes first charging demand power; in a case where the charging mode information includes second charging mode information, the charging demand power includes second charging demand power. Wherein, the first charging demand power is greater than the second charging demand power.

[0248] The first charging mode information can be used to indicate an overcharge charging mode, and the second charging mode information can be used to indicate a fast charging mode.

[0249] Optionally, the first charging demand power can be greater than or equal to 300kW. For example, the first charging demand power can be greater than or equal to 350kW, 400kW, 450kW, 480kW, 520kW, 560kW, 600kW, 700kW, 800kW, etc.

[0250] The second charging demand power may, for example, be in the range of 150kW-300kW. For example, the second charging demand power can be in the range of 180kW-280kW, or in the range of 200kW-260kW, or in the range of 220kW-240kW.

[0251] Further, the charging mode information can further include third charging mode information. In a case where the charging mode information includes third charging mode information, the charging demand power includes third charging demand power, and the third charging demand power is less than the second charging demand power.

[0252] Wherein, the third charging mode information can be used to indicate a slow charging mode.

[0253] Exemplarily, the third charging demand power can be less than 150kW. For example, the third charging demand power can be less than 5kW, 7kW, 10kW, 30kW, 50kW, 70kW, 90kW, 110kW, etc.

[0254] The above technical solution provides a plurality of charging modes, and the charging demand power corresponding to the plurality of charging modes is different. In this way, in the actual charging process, the charging device can flexibly use the appropriate charging mode to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0255] In some embodiments, the discharging power of the energy storage device includes a first discharging power when the charging mode information includes the first charging mode information, and includes a second discharging power when the charging mode information includes the second charging mode information. The first discharging power is greater than or equal to the second discharging power.

[0256] Optionally, the first discharging power can be less than the first charging demand power, and the second discharging power can be less than the second charging demand power.

[0257] The first discharging power can be greater than or equal to 300 kW. For example, the first discharging power can be greater than or equal to 350 kW, 400 kW, 450 kW, 480 kW, 520 kW, 560 kW, 600 kW, 700 kW, 800 kW, etc.

[0258] The second discharging power can be in the range of 150 kW-300 kW, for example. For example, the second discharging power can be in the range of 180 kW-280 kW, or in the range of 200 kW-260 kW, or in the range of 220 kW-240 kW.

[0259] The charging demand power can include a third discharging power when the charging mode information includes third charging mode information, and the third discharging power is less than the second discharging power.

[0260] The third discharging power can be less than the third charging demand power. For example, the third discharging power can be less than 150 kW. For example, the third discharging power can be less than 5 kW, 7 kW, 10 kW, 30 kW, 50 kW, 70 kW, 90 kW, 110 kW, etc.

[0261] The above technical solutions provide a plurality of charging modes, and the discharging powers corresponding to the plurality of charging modes are different. In this way, in the actual charging process, the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0262] In some embodiments, the discharging rate of the energy storage device includes a first discharging rate when the charging mode information includes the first charging mode information, and includes a second discharging rate when the charging mode information includes the second charging mode information. The first discharging rate is greater than the second discharging rate.

[0263] Optionally, the first discharging rate can be greater than or equal to 2C rate. For example, the first discharging rate can be greater than or equal to 3C rate, 3.5C rate, 4C rate, 4.5C rate, 5C rate, 6C rate, 7C rate, 8C rate, 10C rate, etc.

[0264] The second discharge rate can be greater than or equal to 1C rate. For example, the second discharge rate can be greater than or equal to 2C rate, 2.5C rate, 3C rate, 3.5C rate, 4C rate, 4.5C rate, 5C rate, 5.5C rate, 6C rate, 7C rate, 8C rate, etc.

[0265] It can be understood by those skilled in the art that the first discharge rate and the second discharge rate can be values in the foregoing examples, as long as the first discharge rate is greater than the second discharge rate, for example, the first discharge rate is 4C rate and the second discharge rate is 2C rate.

[0266] In a case where the charging mode information includes third charging mode information, the discharge rate of the energy storage device can include a third discharge rate, and the third discharge rate is less than the second discharge rate.

[0267] The above technical solutions provide a plurality of charging modes, and the discharge rates corresponding to the plurality of charging modes are different. In this way, in an actual charging process, the charging device can flexibly use a suitable charging mode to charge the battery device according to an actual situation, thereby effectively improving the charging efficiency.

[0268] In some embodiments, in a case where the charging mode information includes first charging mode information, the charging power includes a first charging power; and in a case where the charging mode information includes second charging mode information, the charging power includes a second charging power. The first charging power is greater than or equal to the second charging power.

[0269] Optionally, the first charging power can be greater than or equal to 300 kW. For example, the first charging power can be greater than or equal to 350 kW, 400 kW, 450 kW, 480 kW, 520 kW, 560 kW, 600 kW, and the second charging power can be in a range of 150 kW-300 kW, for example. For example, the second charging power can be in a range of 180 kW-280 kW, or in a range of 200 kW-260 kW, or in a range of 220 kW-240 kW.

[0270] In a case where the charging mode information includes third charging mode information, the charging power includes a third charging power, and the third charging power is less than the second charging power.

[0271] For example, the third charging power can be less than 150 kW. For example, the third charging power can be less than 5 kW, 7 kW, 10 kW, 30 kW, 50 kW, 70 kW, 90 kW, 110 kW, etc.

[0272] The technical solution provides multiple charging modes, and the charging powers corresponding to the multiple charging modes are different. Thus, in the actual charging process, the charging device can flexibly use a suitable charging mode to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0273] In a case where the charging demand information includes the charging mode information, as an example, S210 can specifically include: randomly selecting, from the multiple charging mode information, the charging mode information currently used to charge the battery device.

[0274] As another example, S210 can specifically include: obtaining historical charging mode information of the battery device, and determining the charging mode information currently used to charge the battery device according to the historical charging mode information.

[0275] For example, the charging mode information of the last charging of the battery device can be determined as the charging mode information currently used to charge the battery device.

[0276] For another example, the charging mode information with the highest frequency of use can be determined according to the historical charging mode information, and the charging mode information with the highest frequency of use can be determined as the charging mode information currently used to charge the battery device.

[0277] As yet another example, S210 can specifically include: receiving the charging mode information.

[0278] For example, the battery device can determine the charging mode currently used to charge according to the battery state parameter of the battery device. Then, the charging device is sent the charging mode information indicating the determined charging mode.

[0279] For example, the charging mode information input by the user can be received, and the charging mode information is used to indicate the charging mode selected by the user to charge the battery device.

[0280] Optionally, the user can input the charging mode information on the charging device. Alternatively, the user can also input the charging mode information on the battery device, so that the battery device sends the charging mode information to the charging device.

[0281] The user can first determine the charging mode currently used to charge the battery device, and then send the charging mode information to the charging device.

[0282] The user can determine the charging mode according to multiple factors. For example, the user can determine the charging mode according to the remaining power of the battery device, the charging cost, the distance to the target location, the time length that can be used for charging, the user's personal habits, or the environment in which the user is located, and the like. Specifically, if the current time is night and the user needs to use the battery device the next morning, the user can select slow charging among the multiple charging modes. Or, the user is on a highway and the remaining power of the battery device is low, the user can select super charging among the multiple charging modes to fully charge the battery device or charge it to a power sufficient to reach the destination in a short time. Or, the user prefers fast charging among the multiple charging modes, the user can select fast charging among the multiple charging modes.

[0283] The above technical solution acquires the charging mode information of the battery device by receiving the charging mode information input by the user. In this way, the charging mode information acquired is associated with the relevant situation of the current time of the user, for example, the user has no much time to wait for the charging device to charge the battery device at the current time, the user selects a charging mode with a larger power, thereby effectively improving the user experience.

[0284] In some cases, the charging mode received by the charging device can not be suitable for the battery device or the charging device cannot support the charging mode, therefore, the charging method 400 can further include: determining whether the charging mode matches the charging device and / or determining whether the charging mode matches the battery device, and in the case of not matching, sending switching information for indicating switching of the charging mode. At this time, S230 can specifically include: determining the charging parameter of the charging device according to the discharging capability information and the switched charging mode.

[0285] For example, the user selects the charging mode as super charging, but the charging device cannot provide super charging to the battery device, the charging device can send switching information for indicating switching of the charging mode. For example, the text or voice of switching super charging to fast charging or slow charging can be displayed on the display interface.

[0286] For another example, the user selects the charging mode as super charging, and the charging device determines according to some parameters of the battery device that the battery device cannot support super charging, the charging device can send switching information for indicating switching of super charging to other charging modes.

[0287] The above technical solution, after receiving the charging mode, determines whether the charging mode matches the charging device and / or whether the charging mode matches the battery device, and in the case of not matching, sends switching information for indicating switching of the charging mode, so that the finally determined charging mode can be more matched with the charging device and the battery device, thereby the effect of charging the battery device is better, and the user experience is improved.

[0288] In addition to the charging mode information, the charging demand information can further include charging capacity information, which can include one or more of the following: a charging duration, a charging capacity, a target capacity of the battery device, and a charging cost.

[0289] At this time, the charging method 400 can further include: stopping charging the battery device in a case where the charging operation matches the charging capacity information.

[0290] For example, the charging capacity information includes a charging duration, and the charging duration is 2 hours. After the charging device charges the battery device for 2 hours, the charging device stops charging the battery device.

[0291] For another example, the charging capacity information includes a target capacity of the battery device, and the target capacity is full. After the charging device charges the battery device to full, the charging device stops charging the battery device.

[0292] The above technical solution, the charging demand information includes one or more of the charging duration, the charging capacity, the target capacity of the battery device, and the charging cost, i.e., the charging demand information can include multiple charging-related parameters. In this way, the accuracy of the charging parameters determined according to the charging demand information is high, and the efficiency of charging the battery device based on the charging parameters is high.

[0293] Of course, the charging device can also stop charging the battery device when the following situations occur: charging device failure, battery device failure, single cell charging cutoff voltage out of limit, single cell temperature out of limit, and charging current out of limit, etc.

[0294] In addition to the energy storage device, the charging device can further include a power conversion device configured to charge the energy storage device by input power.

[0295] The power conversion device can include, for example, an alternating current / direct current (AC / DC) converter in the power conversion device. Figure 1 Alternatively, the power conversion device can include, for example, an AC / DC converter and a direct current / direct current (DC / DC) converter.

[0296] The power conversion device can include a rated power. In some embodiments, the rated power can satisfy at least one of the following: the charging demand power is greater than the rated power, the charging power is greater than the rated power, and the discharging power of the energy storage device is greater than the rated power.

[0297] The rated power can be in the range of 30kW-150kW. For example, the rated power can be 50kW, 70kW, 80kW, 100kW, 110kW, 130kW, etc. The charging device provided by the embodiments of the present disclosure can be installed or configured in a working environment with limited power supply, for example, the working environment of the charging device can only provide a small input power, and if a larger input power is required, the working environment needs to be modified, for example, the transformer needs to be expanded, which has a high construction cost. However, through the technical solutions provided by the embodiments of the present disclosure, although the input power is small, for example, the rated power input by the power conversion device is in the range of 30kW-150kW, but a large power output can still be provided, so as to charge the battery device, thereby greatly improving the charging rate of the battery device.

[0298] Optionally, the charging demand power can be greater than x times the rated power, and / or the charging power can be greater than x times the rated power, and / or the discharging power of the energy storage device can be greater than x times the rated power.

[0299] For example, x can be 1.5, 2, 3, 4, 5, 6 or a larger value.

[0300] The above technical solutions, the charging demand power is greater than x times the rated power, and / or the charging power is greater than x times the rated power, and / or the discharging power of the energy storage device is greater than x times the rated power, for example, x is equal to 3, so that the charging device can further obtain a larger power output with a smaller power input, thereby greatly improving the charging rate of the battery device.

[0301] In some embodiments, the charging power can include the discharging power of the energy storage device. In other words, part or all of the charging power is derived from the discharging power of the energy storage device.

[0302] When all of the charging power is derived from the discharging power of the energy storage device, as shown in FIG. 1, the energy storage device can charge the battery device alone. Figure 3 When part of the charging power is derived from the energy storage device, as shown in FIG. 2, the energy storage device can charge the battery device together with other devices such as the power conversion device. Figure 4

[0303] Of course, all of the charging power can also be derived from the discharging power of the power conversion device. At this time, as shown in FIG. 3, the power conversion device independently charges the battery device. Figure 5

[0304] ​​The charging power includes the discharging power of the energy storage device, that is, part or all of the charging power is derived from the discharging power of the energy storage device. In other words, the charging device can charge the battery device in multiple ways, such as the energy storage device charging the battery device alone, or the energy storage device and other components charging the battery device together. In this way, the charging device can flexibly use the appropriate charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0305] When the discharging capacity information meets the first preset condition, charging the battery device can include charging the battery device independently by the energy storage device. When the discharging capacity information meets the second preset condition, charging the battery device includes charging the battery device by the energy storage device and the power conversion device. When the discharging capacity information meets the third preset condition, charging the battery device includes charging the battery device by the power conversion device.

[0306] The above technical solution, in the case where the discharging capacity information meets different preset conditions, the charging device charges the battery device through different devices, that is, the charging device can flexibly use the appropriate charging method to charge the battery device according to the actual situation, thereby effectively improving the charging efficiency.

[0307] The discharging capacity information can include, but is not limited to, the SOC of the energy storage device and the state of energy (SOE) of the energy storage device.

[0308] When the discharging capacity information includes the SOC of the energy storage device, the discharging capacity information meeting the first preset condition can include that the SOC belongs to a first SOC range; and / or the discharging capacity information meeting the second preset condition can include that the SOC belongs to a second SOC range; and / or the discharging capacity information meeting the third preset condition can include that the SOC belongs to a third SOC range.

[0309] The first SOC range can be greater than or equal to 50% SOC. For example, the first SOC range can be greater than or equal to 60% SOC, or greater than or equal to 70% SOC, or greater than or equal to 80% SOC, or greater than or equal to 90% SOC, or greater than or equal to 95% SOC.

[0310] The second SOC range can be greater than or equal to 20% SOC and less than 50% SOC. For example, the second SOC range can be greater than or equal to 25% SOC and less than or equal to 45% SOC, or greater than or equal to 30% SOC and less than or equal to 40% SOC.

[0311] The third SOC range can be less than 20% SOC. For example, the third SOC range can be less than 15% SOC, or less than 10% SOC, or less than 5% SOC.

[0312] The component for charging the battery device in the charging device is determined according to the state of charge of the energy storage device, so that the determined power supply conforms to the actual situation of the energy storage device, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0313] In a case where the discharge capability information includes the SOE of the energy storage device, the discharge capability information satisfying the first preset condition can include that the SOE belongs to a first SOE range; and / or, the discharge capability information satisfying the second preset condition can include that the SOE belongs to a second SOE range; and / or, the discharge capability information satisfying the third preset condition can include that the SOE belongs to a third SOE range.

[0314] The first SOE range can be greater than or equal to 50% SOE. For example, the first SOE range can be greater than or equal to 60% SOE, or greater than or equal to 70% SOE, or greater than or equal to 80% SOE, or greater than or equal to 90% SOE, or greater than or equal to 95% SOE.

[0315] The second SOE range can be greater than or equal to 20% SOE and less than 50% SOE. For example, the second SOE range can be greater than or equal to 25% SOE and less than or equal to 45% SOE, or greater than or equal to 30% SOE and less than or equal to 40% SOE.

[0316] The third SOE range can be less than 20% SOE. For example, the third SOE range can be less than 15% SOE, or less than 10% SOE, or less than 5% SOE.

[0317] The component for charging the battery device in the charging device is determined according to the state of charge of the energy storage device, so that the determined power supply conforms to the actual situation of the energy storage device, and the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0318] Further, the discharge capability information can also indicate the maximum discharge power of the energy storage device. At this time, the discharge capability information satisfying the first preset condition can include that the maximum discharge power belongs to a first power range; and / or, the discharge capability information satisfying the second preset condition can include that the maximum discharge power belongs to a second power range; and / or, the discharge capability information satisfying the third preset condition can include that the maximum discharge power belongs to a third power range.

[0319] The first power range can be greater than or equal to 300 kW. For example, the first power range can be greater than or equal to 350 kW, or greater than or equal to 400 kW, or greater than or equal to 450 kW, or greater than or equal to 500 kW, or greater than or equal to 550 kW, or greater than or equal to 600 kW, or greater than or equal to 700 kW, or greater than or equal to 800 kW, and the like.

[0320] The second power range may, for example, be in the range of 150 kW-300 kW. For example, the second power range may be in the range of 180 kW-280 kW, or the second power range may be in the range of 200 kW-250 kW.

[0321] The third power range may, for example, be less than 150 kW. For example, the third power range can be less than or equal to 100 kW, or the third power range can be less than or equal to 80 kW, or the third power range can be less than or equal to 50 kW, or the third power range can be less than or equal to 30 kW, or the third power range can be less than or equal to 10 kW, or the third power range can be less than or equal to 7 kW.

[0322] The above technical solution determines the components in the charging device that charge the battery device according to the maximum discharge power of the energy storage device. In this way, the power supply determined conforms to the actual situation of the energy storage device, so that the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0323] In some embodiments, S220 can specifically include determining the discharge capability information of the energy storage device according to the electrical parameter of the energy storage device. The discharge capability information indicates the maximum discharge power of the energy storage device.

[0324] The electrical parameter can include, but is not limited to, the SOC of the energy storage device, the SOE of the energy storage device, the state of health (SOH) of the energy storage device, and the like.

[0325] The maximum discharge power can be used to determine the actual output power of the energy storage device.

[0326] The above technical solution determines the maximum discharge power of the energy storage device according to the electrical parameter of the energy storage device, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage device. The charging parameter determined can conform to the actual situation of the energy storage device, so that the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0327] In a case where the electrical parameter satisfies the fourth preset condition, the maximum discharge power includes a first maximum discharge power; in a case where the electrical parameter satisfies the fifth preset condition, the maximum discharge power includes a second maximum discharge power; and in a case where the electrical parameter satisfies the sixth preset condition, the maximum discharge power includes a third maximum discharge power. The maximum discharge power is in descending order as follows: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0328] In a case where the electrical parameter includes an SOC of the energy storage device, the electrical parameter satisfying the fourth preset condition can include that the SOC satisfies a fourth SOC state range; and / or, the electrical parameter satisfying the fifth preset condition can include that the SOC satisfies a fifth SOC state range; and / or, the electrical parameter satisfying the sixth preset condition can include that the SOC satisfies a sixth SOC state range.

[0329] The fourth SOC range can be greater than or equal to 50% SOC. For example, the fourth SOC range can be greater than or equal to 60% SOC, or greater than or equal to 70% SOC, or greater than or equal to 80% SOC, or greater than or equal to 90% SOC, or greater than or equal to 95% SOC.

[0330] The fifth SOC range can be greater than or equal to 20% SOC and less than 50% SOC. For example, the fifth SOC range can be greater than or equal to 25% SOC and less than or equal to 45% SOC, or greater than or equal to 30% SOC and less than or equal to 40% SOC.

[0331] The sixth SOC range can be less than 20% SOC. For example, the sixth SOC range can be less than 15% SOC, or less than 10% SOC, or less than 5% SOC.

[0332] The above technical solution determines the maximum discharge power of the energy storage device according to the state of charge of the energy storage device, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage device, so that the determined charging parameter can meet the current state of the energy storage device, so that the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0333] In a case where the electrical parameter includes an SOE of the energy storage device, the electrical parameter satisfying the fourth preset condition includes that the SOE belongs to a fourth SOE range; and / or, the electrical parameter satisfying the fifth preset condition includes that the SOE belongs to a fifth SOE range; and / or, the electrical parameter satisfying the sixth preset condition includes that the SOE belongs to a sixth SOE range.

[0334] The fourth SOE range can be greater than or equal to 50% SOE. For example, the fourth SOE range can be greater than or equal to 60% SOE, or greater than or equal to 70% SOE, or greater than or equal to 80% SOE, or greater than or equal to 90% SOE, or greater than or equal to 95% SOE.

[0335] The fifth SOE range can be greater than or equal to 20% SOE and less than 50% SOE. For example, the fifth SOE range can be greater than or equal to 25% SOE and less than or equal to 45% SOE, or greater than or equal to 30% SOE and less than or equal to 40% SOE.

[0336] The sixth SOE range can be less than 20% SOE. For example, the sixth SOE range can be less than 15% SOE, or less than 10% SOE, or less than 5% SOE.

[0337] The above technical solution determines the maximum discharge power of the energy storage device according to the energy state of the energy storage device, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage device, so that the determined charging parameter can meet the current state of the energy storage device, so that the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0338] In the embodiments of the present application, the size of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0339] Furthermore, the various embodiments described in the present application and / or the technical features in the various embodiments can be combined with each other in any way without conflict, and the technical scheme obtained after combination should also fall within the protection scope of the present application.

[0340] The charging method of the embodiments of the present application is described in detail above, and the charging device of the embodiments of the present application will be described below. It should be understood that the charging device in the embodiments of the present application can execute the charging method in the embodiments of the present application.

[0341] Figure 6 A schematic block diagram of the charging device 100 of the embodiments of the present application is shown. As shown in Figure 6 The charging device 100 includes an energy storage device 1010 and a control device 1020, and the charging device 100 is configured to charge the battery device by the energy storage device 1010. The control device 1020 can be used to:

[0342] determine the charging demand information of the battery device, the charging demand information being used to indicate the charging demand power of the battery device;

[0343] determine the discharge capability information of the energy storage device;

[0344] determine the charging parameter of the charging device according to the discharge capability information and the charging demand information;

[0345] charge the battery device according to the charging parameter, and the charging power corresponding to the charging parameter is less than or equal to the charging demand power.

[0346] Optionally, in the embodiment of the present application, the charging power includes the discharging power of the energy storage device.

[0347] Optionally, in the embodiment of the present application, the ratio of the rated energy to the rated power of the energy storage device is less than or equal to 1:3; and / or the ratio of the rated energy to the maximum discharging power of the energy storage device is less than or equal to 1:4; and / or the energy density of the energy storage device is greater than or equal to 380 watt-hours per liter.

[0348] Optionally, in the embodiment of the present application, the charging demand information includes charging mode information, in the case that the charging mode information includes first charging mode information, the charging demand power includes first charging demand power, and in the case that the charging mode information includes second charging mode information, the charging demand power includes second charging demand power; wherein the first charging demand power is greater than the second charging demand power.

[0349] Optionally, in the embodiment of the present application, in the case that the charging mode information includes first charging mode information, the discharging power of the energy storage device includes first discharging power, and in the case that the charging mode information includes second charging mode information, the discharging power of the energy storage device includes second discharging power; wherein the first discharging power is greater than or equal to the second discharging power.

[0350] Optionally, in the embodiment of the present application, in the case that the charging mode information includes first charging mode information, the discharging rate of the energy storage device includes first discharging rate, and in the case that the charging mode information includes second charging mode information, the discharging rate of the energy storage device includes second discharging rate; wherein the first discharging rate is greater than the second discharging rate.

[0351] Optionally, in the embodiment of the present application, in the case that the charging mode information includes first charging mode information, the charging power includes first charging power, and in the case that the charging mode information includes second charging mode information, the charging power includes second charging power; wherein the first charging power is greater than the second charging power.

[0352] Optionally, in the embodiment of the present application, the control device 1020 is specifically configured to: receive the charging mode information input by the user, and the charging mode information is used to indicate the charging mode selected by the user for charging the battery device.

[0353] Optionally, in the embodiment of the present application, the control device 1020 is further configured to: determine whether the charging mode matches the charging device and / or whether the charging mode matches the battery device; and send switching information for instructing switching of the charging mode in a case where the charging mode does not match the charging device and / or the charging mode does not match the battery device; and determine the charging parameter according to the discharging capability information and the switched charging mode.

[0354] Optionally, in the embodiment of the present application, the charging demand information includes charging power information, and the charging power information includes one or more of the following information: charging duration, charging power, target power of the battery device, and charging cost; and the control device 1020 is further configured to: stop charging the battery device in a case where the charging operation matches the charging power information.

[0355] Optionally, in the embodiment of the present application, the charging device further includes a power conversion device configured to charge the energy storage device by input power, the power conversion device includes a rated power, the charging demand power is greater than the rated power, the charging power is greater than the rated power, and / or the discharging power of the energy storage device is greater than the rated power.

[0356] Optionally, in the embodiment of the present application, the charging demand power is greater than 3 times the rated power; and / or the charging power is greater than 3 times the rated power; and / or the discharging power of the energy storage device is greater than 3 times the rated power.

[0357] Optionally, in the embodiment of the present application, in a case where the discharging capability information meets a first preset condition, the control device is further configured to: charge the battery device independently by the energy storage device; in a case where the discharging capability information meets a second preset condition, the control device is further configured to: charge the battery device by the energy storage device and the power conversion device; and in a case where the discharging capability information meets a third preset condition, the control device is further configured to: charge the battery device independently by the power conversion device.

[0358] Optionally, in the embodiment of the present application, the discharging capability information includes a state of charge of the energy storage device; the discharging capability information meeting the first preset condition includes that the state of charge belongs to a first state of charge range; and / or the discharging capability information meeting the second preset condition includes that the state of charge belongs to a second state of charge range; and / or the discharging capability information meeting the third preset condition includes that the state of charge belongs to a third state of charge range.

[0359] Optionally, in the embodiment of the present application, the discharge capability information includes an energy state of the energy storage device; the discharge capability information satisfies the first preset condition, including that the energy state belongs to a first energy state range; and / or the discharge capability information satisfies the second preset condition, including that the energy state belongs to a second energy state range; and / or the discharge capability information satisfies the third preset condition, including that the energy state belongs to a third energy state range.

[0360] Optionally, in the embodiment of the present application, the discharge capability information indicates a maximum discharge power of the energy storage device; the discharge capability information satisfies the first preset condition, including that the maximum discharge power belongs to a first power range; and / or the discharge capability information satisfies the second preset condition, including that the maximum discharge power belongs to a second power range; and / or the discharge capability information satisfies the third preset condition, including that the maximum discharge power belongs to a third power range.

[0361] Optionally, in the embodiment of the present application, the control device 1020 is specifically configured to: determine, according to the electrical parameter of the energy storage device, discharge capability information of the energy storage device, the discharge capability information indicating a maximum discharge power of the energy storage device.

[0362] Optionally, in the embodiment of the present application, in the case that the electrical parameter satisfies a fourth preset condition, the maximum discharge power includes a first maximum discharge power; in the case that the electrical parameter satisfies a fifth preset condition, the maximum discharge power includes a second maximum discharge power; in the case that the electrical parameter satisfies a sixth preset condition, the maximum discharge power includes a third maximum discharge power; wherein the maximum discharge power is in descending order as follows: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0363] Optionally, in the embodiment of the present application, the electrical parameter includes a state of charge of the energy storage device; the electrical parameter satisfies the fourth preset condition, including that the state of charge belongs to a fourth state of charge range; and / or the electrical parameter satisfies the fifth preset condition, including that the state of charge belongs to a fifth state of charge range; and / or the electrical parameter satisfies the sixth preset condition, including that the state of charge belongs to a sixth state of charge range.

[0364] Optionally, in the embodiment of the present application, the electrical parameter includes an energy state of the energy storage device; the electrical parameter satisfies the fourth preset condition, including that the energy state belongs to a fourth energy state range; and / or the electrical parameter satisfies the fifth preset condition, including that the energy state belongs to a fifth energy state range; and / or the electrical parameter satisfies the sixth preset condition, including that the energy state belongs to a sixth state of charge range.

[0365] Optionally, in the embodiment of the present application, the charging power is greater than or equal to 100 kW, and / or the charging demand power is greater than or equal to 300 kW.

[0366] It should be understood that the charging device 100 can implement the corresponding operations in the charging method 400, and details are not repeated here for brevity.

[0367] Figure 7 is a hardware structure schematic diagram of the charging device 100 of the embodiment of the present application. The charging device 100 includes a memory 1001, a processor 1002, a communication interface 1003, and a bus 1004. Among them, the memory 1001, the processor 1002, and the communication interface 1003 are communicatively connected to each other through the bus 1004.

[0368] The memory 1001 can be a read-only memory (ROM), a static storage device, and a random access memory (RAM). The memory 1001 can store programs, and when the programs stored in the memory 1001 are executed by the processor 1002, the processor 1002 and the communication interface 1003 are used to execute the various steps of the charging method of the embodiment of the present application.

[0369] The processor 1002 can adopt a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU), or one or more integrated circuits, to execute related programs to implement the functions required by the units in the device of the embodiment of the present application or to execute the charging method of the embodiment of the present application.

[0370] The processor 1002 can also be an integrated circuit chip with signal processing capability. In the implementation process, the various steps of the charging method of the embodiment of the present application can be completed by the integrated logic circuit of the hardware in the processor 1002 or the instructions in the form of software.

[0371] The processor 1002 can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution or executed by a combination of hardware and software modules in the processor. The software module can be located in the random access memory, the flash memory, the read-only memory, the programmable read-only memory or the electrically erasable programmable memory, the register or other mature storage medium in the art. The storage medium is located in the memory 1001, and the processor 1002 reads the information in the memory 1001, and combines the hardware to complete the functions required by the units included in the charging device 100 of the embodiments of the present application, or executes the charging method of the embodiments of the present application.

[0372] The communication interface 1003 uses a transceiver such as but not limited to a transceiver to realize the communication between the charging device 100 and other devices or communication networks.

[0373] The bus 1004 can include a path for transmitting information between various components (for example, the memory 1001, the processor 1002, the communication interface 1003) of the charging device 100.

[0374] It should be noted that although the above charging device 100 only shows the memory, the processor, the communication interface, but in the specific implementation process, those skilled in the art should understand that the charging device 100 can also include other devices necessary for normal operation. At the same time, according to the specific needs, those skilled in the art should understand that the charging device 100 can also include hardware devices for realizing other additional functions. In addition, those skilled in the art should understand that the charging device 100 can also only include the devices necessary for the embodiments of the present application, and does not have to include all the devices shown in the charging device 100. Figure 7

[0375] The embodiments of the present application also provide a computer readable storage medium for storing a computer program for executing the method of the various embodiments of the present application.

[0376] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0377] ​The embodiment of the present application further provides a computer program product, which comprises a computer program stored on a computer readable storage medium, and the computer program comprises program instructions, which, when executed by a computer, cause the computer to execute the charging method.

[0378] The technical solution described above determines the maximum discharge power of the energy storage module according to the energy state of the energy storage module, and then determines the charging parameter for charging the battery device according to the maximum discharge power of the energy storage module, so that the determined charging parameter can conform to the current state of the energy storage module, and thus the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0379] In the embodiment of the present application, the size of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0380] In addition, the various embodiments described in the present application and / or the technical features in the various embodiments can be combined with each other in any way without conflict, and the technical scheme obtained after combination should also fall within the protection scope of the present application.

[0381] The charging method of the embodiment of the present application is described in detail above, and the charging device of the embodiment of the present application will be described below. It should be understood that the charging device in the embodiment of the present application can execute the charging method in the embodiment of the present application.

[0382] The charging device disclosed in the embodiment of the present application can be used to charge the equipment requiring fast charging / ultra-fast charging such as electric vehicles, electric ships and electric tools, and can also be used to charge the equipment not requiring fast charging / ultra-fast charging such as electric vehicles, electric ships and electric tools, that is, the charging device disclosed in the embodiment of the present application can realize charging of the electric equipment according to high power and low power, and has a wide range of applications.

[0383] The charging device of the present application will be described below in combination with specific embodiments.

[0384] Figure 6 A schematic block diagram of the charging device 100 of the embodiment of the present application is shown. As shown in Figure 6 The charging device 100 comprises an energy storage module 110 and a control device 1020, and the charging device 100 is configured to charge the battery device by the energy storage module 110. The control device 1020 can be used to:

[0385] determine the charging demand information of the battery device, the charging demand information being used to indicate the charging demand power of the battery device;

[0386] determine the discharge capacity information of the energy storage module;

[0387] determine the charging parameter of the charging device according to the discharge capability information and the charging demand information;

[0388] charge the battery device according to the charging parameter, the charging power corresponding to the charging parameter being less than or equal to the charging demand power.

[0389] Optionally, in the embodiment of the present application, the charging power includes the discharging power of the energy storage module.

[0390] Optionally, in the embodiment of the present application, the ratio of the rated energy to the rated power of the energy storage module is less than or equal to 1:3; and / or the ratio of the rated energy to the maximum discharging power of the energy storage module is less than or equal to 1:4; and / or the energy density of the energy storage module is greater than or equal to 380 watt-hours per liter.

[0391] Optionally, in the embodiment of the present application, the charging demand information includes charging mode information, in the case that the charging mode information includes first charging mode information, the charging demand power includes first charging demand power, in the case that the charging mode information includes second charging mode information, the charging demand power includes second charging demand power; wherein the first charging demand power is greater than the second charging demand power.

[0392] Optionally, in the embodiment of the present application, in the case that the charging mode information includes first charging mode information, the discharging power of the energy storage module includes first discharging power, in the case that the charging mode information includes second charging mode information, the discharging power of the energy storage module includes second discharging power; wherein the first discharging power is greater than or equal to the second discharging power.

[0393] Optionally, in the embodiment of the present application, in the case that the charging mode information includes first charging mode information, the discharging rate of the energy storage module includes first discharging rate, in the case that the charging mode information includes second charging mode information, the discharging rate of the energy storage module includes second discharging rate; wherein the first discharging rate is greater than the second discharging rate.

[0394] Optionally, in the embodiment of the present application, in the case that the charging mode information includes first charging mode information, the charging power includes first charging power, in the case that the charging mode information includes second charging mode information, the charging power includes second charging power; wherein the first charging power is greater than the second charging power.

[0395] Optionally, in the embodiment of the present application, the control device 1020 is specifically configured to: receive the charging mode information input by the user, the charging mode information being used to indicate the charging mode selected by the user for charging the battery device.

[0396] Optionally, in the embodiment of the present application, the control device 1020 is further configured to: determine whether the charging mode matches the charging device and / or whether the charging mode matches the battery device; and send switching information for instructing switching of the charging mode in a case where the charging mode does not match the charging device and / or the charging mode does not match the battery device; and determine the charging parameter according to the discharging capability information and the switched charging mode.

[0397] Optionally, in the embodiment of the present application, the charging demand information includes charging power information, and the charging power information includes one or more of the following information: charging duration, charging power, target power of the battery device, and charging cost; and the control device 1020 is further configured to: stop charging the battery device in a case where the charging operation matches the charging power information.

[0398] Optionally, in the embodiment of the present application, the charging device further includes a power conversion device configured to charge the energy storage module by input power, the power conversion device includes a rated power, the charging demand power is greater than the rated power, the charging power is greater than the rated power, and / or the discharging power of the energy storage module is greater than the rated power.

[0399] Optionally, in the embodiment of the present application, the charging demand power is greater than 3 times the rated power; and / or the charging power is greater than 3 times the rated power; and / or the discharging power of the energy storage module is greater than 3 times the rated power.

[0400] Optionally, in the embodiment of the present application, in a case where the discharging capability information satisfies a first preset condition, the control device 1020 is further configured to: charge the battery device independently by the energy storage module; in a case where the discharging capability information satisfies a second preset condition, the control device 1020 is further configured to: charge the battery device by the energy storage module and the power conversion device; and in a case where the discharging capability information satisfies a third preset condition, the control device 1020 is further configured to: charge the battery device independently by the power conversion device.

[0401] Optionally, in the embodiment of the present application, the discharging capability information includes a state of charge of the energy storage module; the discharging capability information satisfying the first preset condition includes that the state of charge belongs to a first state of charge range; and / or the discharging capability information satisfying the second preset condition includes that the state of charge belongs to a second state of charge range; and / or the discharging capability information satisfying the third preset condition includes that the state of charge belongs to a third state of charge range.

[0402] Optionally, in the embodiment of the present application, the discharge capability information includes an energy state of the energy storage module; the discharge capability information satisfies the first preset condition, including that the energy state belongs to a first energy state range; and / or the discharge capability information satisfies the second preset condition, including that the energy state belongs to a second energy state range; and / or the discharge capability information satisfies the third preset condition, including that the energy state belongs to a third energy state range.

[0403] Optionally, in the embodiment of the present application, the discharge capability information indicates a maximum discharge power of the energy storage module; the discharge capability information satisfies the first preset condition, including that the maximum discharge power belongs to a first power range; and / or the discharge capability information satisfies the second preset condition, including that the maximum discharge power belongs to a second power range; and / or the discharge capability information satisfies the third preset condition, including that the maximum discharge power belongs to a third power range.

[0404] Optionally, in the embodiment of the present application, the control device 1020 is specifically configured to: determine, according to the electrical parameter of the energy storage module, discharge capability information of the energy storage module, the discharge capability information indicating a maximum discharge power of the energy storage module.

[0405] Optionally, in the embodiment of the present application, in the case that the electrical parameter satisfies a fourth preset condition, the maximum discharge power includes a first maximum discharge power; in the case that the electrical parameter satisfies a fifth preset condition, the maximum discharge power includes a second maximum discharge power; in the case that the electrical parameter satisfies a sixth preset condition, the maximum discharge power includes a third maximum discharge power; wherein the maximum discharge power is in descending order as follows: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0406] Optionally, in the embodiment of the present application, the electrical parameter includes a state of charge of the energy storage module; the electrical parameter satisfies the fourth preset condition, including that the state of charge belongs to a fourth state of charge range; and / or the electrical parameter satisfies the fifth preset condition, including that the state of charge belongs to a fifth state of charge range; and / or the electrical parameter satisfies the sixth preset condition, including that the state of charge belongs to a sixth state of charge range.

[0407] Optionally, in the embodiment of the present application, the electrical parameter includes an energy state of the energy storage module; the electrical parameter satisfies the fourth preset condition, including that the energy state belongs to a fourth energy state range; and / or the electrical parameter satisfies the fifth preset condition, including that the energy state belongs to a fifth energy state range; and / or the electrical parameter satisfies the sixth preset condition, including that the energy state belongs to a sixth state of charge range.

[0408] Optionally, in the embodiment of the present application, the charging power is greater than or equal to 100 kW, and / or the charging demand power is greater than or equal to 300 kW.

[0409] It should be understood that the charging device 100 can implement the corresponding operations in the charging method 400, and details are not described herein for brevity.

[0410] Figure 7 FIG. 1 is a schematic diagram of a hardware structure of the charging device 100 according to an embodiment of the present application. The charging device 100 includes a memory 1001, a processor 1002, a communication interface 1003, and a bus 1004. The memory 1001, the processor 1002, and the communication interface 1003 are communicatively connected to each other through the bus 1004.

[0411] The memory 1001 can be a read-only memory (ROM), a static storage device, and a random access memory (RAM). The memory 1001 can store programs, and when the programs stored in the memory 1001 are executed by the processor 1002, the processor 1002 and the communication interface 1003 are configured to perform each step of the charging method according to the embodiments of the present application.

[0412] The processor 1002 can be a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU), or one or more integrated circuits, configured to execute related programs to implement the functions required by the units in the device according to the embodiments of the present application or to execute the charging method according to the embodiments of the present application.

[0413] The processor 1002 can also be an integrated circuit chip with signal processing capability. In the implementation process, each step of the charging method according to the embodiments of the present application can be completed by the integrated logic circuit or the instruction in the form of software in the processor 1002.

[0414] The processor 1002 can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution or executed by a combination of hardware and software modules in the processor. The software module can be located in the random access memory, the flash memory, the read-only memory, the programmable read-only memory or the electrically erasable programmable memory, the register or other mature storage medium in the art. The storage medium is located in the memory 1001, and the processor 1002 reads the information in the memory 1001, and combines the hardware to complete the functions required by the units included in the charging device 100 of the embodiments of the present application, or executes the charging method of the embodiments of the present application.

[0415] The communication interface 1003 uses a transceiver such as but not limited to a transceiver to realize the communication between the charging device 100 and other devices or communication networks.

[0416] The bus 1004 can include a path for transmitting information between various components (for example, the memory 1001, the processor 1002, the communication interface 1003) of the charging device 100.

[0417] It should be noted that although the above charging device 100 only shows the memory, the processor, the communication interface, but in the specific implementation process, those skilled in the art should understand that the charging device 100 can also include other devices necessary for normal operation. At the same time, according to the specific needs, those skilled in the art should understand that the charging device 100 can also include hardware devices for realizing other additional functions. In addition, those skilled in the art should understand that the charging device 100 can also only include the devices necessary for the embodiments of the present application, and does not have to include all the devices shown in the charging device 100. Figure 7

[0418] The embodiments of the present application also provide a computer readable storage medium for storing a computer program for executing the method of the various embodiments of the present application.

[0419] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0420] ​The embodiment of the present application further provides a computer program product, which comprises a computer program stored on a computer readable storage medium, and the computer program comprises program instructions, which, when executed by a computer, cause the computer to perform the charging method.

[0421] Figure 8 A structural schematic diagram of a charging device 100 according to an embodiment of the present application.

[0422] In some embodiments, with reference to Figure 8 The energy storage device comprises one or more energy storage modules 110, and each energy storage module 110 comprises one or more energy storage units, i.e., energy storage unit 1,..., energy storage unit n-1 and energy storage unit n (n is a positive integer), each energy storage unit has a first positive power supply end (+) and a first negative power supply end (-), and the one or more energy storage units are connected to a second positive power supply end (+) and a second negative power supply end (-) of the energy storage module 110 through the first positive power supply end and the first negative power supply end, and the energy storage module 110 is configured to provide a first direct current. As an example, the energy storage unit can be an electric box.

[0423] The charging device 100 further comprises a charging module 120 connected to the second positive power supply end and the second negative power supply end of the energy storage module 110, and the charging module 120 is configured to be suitable for charging output based on the first direct current, the maximum charging output power of the charging module 120 is greater than or equal to 350 kilowatts, and / or the rated charging output power of the charging module 120 is greater than or equal to 290 kilowatts.

[0424] Specifically, the number of energy storage units can be selected and set based on actual needs. When the charging device 100 is only used for small power charging, the energy storage units can be set to one or a small number of several, which can meet the small power charging application scenario at this time; when the charging device 100 is used for large power charging, the energy storage units can be set to multiple, which can meet the large power and small power charging application scenarios, for example, adjusting the charging output power of the energy storage units, the charging module, or the energy storage units and the charging module can perform large power or small power charging. Due to the modularity of the energy storage units, the number of energy storage units can be freely increased or decreased, which can realize quick access and large power charging, and at the same time, there is no need to increase or expand the transformer.

[0425] When the energy storage unit is one, the first positive power terminal of the energy storage unit is connected with the second positive power terminal of the energy storage module 110, the first negative power terminal of the energy storage unit is connected with the second negative power terminal of the energy storage module 110, and the second positive power terminal and the second negative power terminal of the energy storage module 110 are also connected with the charging module 120. When charging, the energy storage module 110 provides the first direct current through the energy storage unit, and the charging module 120 obtains the target direct current by converting the first direct current to charge the device to be charged. At this time, the charging device 100 can meet the small power charging application scenario. It should be noted that the related parameters of the energy storage unit and the charging module 120 can be set based on the actual situation, and the charging demand can be met through reasonable parameter configuration.

[0426] When the energy storage unit is multiple, the multiple energy storage units can be connected in series, parallel or series-parallel mode, and connected with the charging module 120 through the second positive power terminal and the second negative power terminal of the energy storage module 110. For example, in the energy storage unit 1,..., the energy storage unit n-1 and the energy storage unit n are connected in series through the first positive power terminal and the first negative power terminal of each energy storage unit between the second positive power terminal and the second negative power terminal of the energy storage module 110, and the second positive power terminal and the second negative power terminal of the energy storage module 110 are also connected with the charging module 120. Figure 8 When charging, when high-power charging is needed, the energy storage module 110 provides the first direct current through the multiple energy storage units, the first direct current can have high power, and then the charging module 120 obtains the target direct current by converting the first direct current to charge the device to be charged, the target direct current has high power, so as to meet the high-power charging application scenario; when small power charging is needed, the first direct current can have low power, and the target direct current has low power, so as to meet the small power charging application scenario. It should be noted that the related parameters of the energy storage unit and the charging module 120 can be set based on the actual situation, and the charging demand can be met through reasonable parameter configuration. When the energy storage unit is multiple, the energy of the energy storage module is the sum of the energy of the multiple energy storage units.

[0427] For example, the maximum charging output power of the charging module 120 is greater than or equal to 350 kW, that is, the maximum charging output power of the charging device 100 is greater than or equal to 350 kW. For example, by selecting a proper number of energy storage units, the maximum charging output power of the charging module 120 can be 350 kW, 360 kW, 500 kW, 800 kW, 900 kW, etc. It should be noted that the charging output power here refers to the maximum charging output power, and in actual charging, it can be downward compatible. For example, when the maximum charging output power is 360 kW, it means that the charging device 100 can output a charging output power of 0-360 kW to meet different charging needs.

[0428] It can be understood that the maximum charging output power of the charging module 120 and the rated charging output power satisfy a certain multiple relationship, for example, a multiple relationship of 1.1-1.2, so the rated charging output power of the charging module 120 can be greater than or equal to 290 kW, that is, the rated charging output power of the charging device 100 is greater than or equal to 290 kW.

[0429] In actual application, the maximum charging output power of the charging module 120 can be limited, the rated charging output power can be limited, or both can be limited.

[0430] In the above embodiments, by configuring modular energy storage units inside the charging device, or setting modular energy storage units and modular charging units outside the charging device, that is, setting energy storage modules and charging modules outside the charging device, the energy storage units and the charging units can be freely added or reduced. When high-power charging is needed, by freely and quickly connecting the energy storage units, not only can high-power charging such as fast charging / ultra-fast charging be realized, but also the transformer does not need to be additionally increased or expanded, and the cost of the transformer can be reduced.

[0431] In some embodiments, referring to Figure 9 , the charging device 100 further includes an input module 130, and the input module 130 is adapted to provide charging energy for each energy storage unit.

[0432] In an example, the input module 130 can be an AC-DC conversion unit.

[0433] Taking the input module 130 as an example, the input module 130 can be adapted to provide charging energy for the energy storage units. In different power consumption environments, whether it is an old city with relatively tight power supply or a remote area sensitive to infrastructure construction costs, the charging device can adjust the power supply parameters of the energy storage module 110 by using the input module 130, thereby achieving the function of fast charging without relying on external complex power supply upgrades, and enhancing the applicability and flexibility of the charging device in various scenarios.

[0434] Thus, the power grid can charge the energy storage units through the input module 130.

[0435] In some embodiments, the maximum output power of the input module 130 is less than or equal to 150 kilowatts, and / or the rated output power of the input module 130 is less than or equal to 125 kilowatts.

[0436] Specifically, the input module 130 is mainly used to charge each energy storage unit in the energy storage module 110, and is a small power charging during charging. For example, the maximum output power of the input module 130 is less than or equal to 150 kilowatts, for example, the maximum output power is 150 kilowatts, 100 kilowatts, and 85 kilowatts, etc. It should be noted that the output power here refers to the maximum output power, which can be downward compatible during actual charging, for example, when the maximum output power is 150 kilowatts, it means that the output power of 0-150 kilowatts can be used to charge each energy storage unit in the energy storage module 110.

[0437] In this example, the input module 130 is a small power output, while the charging module 120 can be a large power output, so the entire charging device 100 can achieve large power output under small power input. For example, the input end of the transformer is connected to the AC power grid, and the output end of the transformer is connected to the input module 130. When the transformer is a small capacity transformer, the maximum output power of the input module 130 will also be limited due to the capacity of the transformer, such as the maximum output power of 150 kilowatts. At this time, each energy storage unit in the energy storage module 110 is charged with small power, but when the energy storage module 110 discharges externally to charge the device to be charged, based on multiple energy storage units, large power charging can be achieved, such as the maximum charging output power of the charging module 120 is 360 kilowatts. In this way, large power output is achieved under small power input, so that the charging device can meet the demand for large power charging without additional transformers or transformer expansion. Those skilled in the art can understand that the power grid generally refers to a system that can provide power. As an example, the power grid can be a municipal power source.

[0438] It can be understood that a certain multiple relationship, for example, a multiple relationship of 1.1-1.2, is satisfied between the maximum output power of the input module 130 and the rated output power, and thus the rated output power of the input module 130 can be less than or equal to 125 kilowatts.

[0439] In actual applications, the maximum output power of the input module 130 can be limited, the rated output power can be limited, or both can be limited.

[0440] In the above embodiments, by configuring the modular energy storage unit inside the charging device 100, the maximum output power and / or the rated power of the input module 130 are limited in the above range, so that the charging device 100 can be flexibly connected to a conventional power network. The output power of most public power grids or commercial power interfaces has certain limitations. The power setting of the input module 130 can successfully obtain charging energy from a conventional power environment without modifying the existing power supply line, improves the access feasibility of the charging device 100 in various power consumption scenarios, and facilitates the installation of the charging device 100. In addition, the charging device 100 can achieve high-power charging under low-power input, so that the charging device 100 can meet the demand for high-power charging without additional transformers or transformer expansion. During the peak power consumption period, when multiple power consumption devices are running at the same time, the energy storage module supplies power to multiple power consumption devices, and the input module 130 stably charges the energy storage unit at a low power, which can effectively reduce the impact of the charging device 100 on the power grid during the charging process, and help maintain the stability of the power grid.

[0441] In some embodiments, the ratio between the maximum charging output power of the charging module 120 and the maximum output power of the input module 130 is greater than 1 and less than or equal to 15, and / or the ratio between the rated charging output power of the charging module 120 and the rated output power of the input module 130 is greater than 1 and less than or equal to 15.

[0442] Specifically, the maximum charging output power of the charging module 120 is greater than the maximum output power of the input module 130, that is, the ratio of the maximum charging output power of the charging module 120 to the maximum output power of the input module 130 is greater than 1, for example, the ratio of the maximum charging output power of the charging module 120 to the maximum output power of the input module 130 can be greater than 2, greater than 2.3, greater than 3, greater than 4, greater than 8, or greater than 12.5, etc., so as to realize high-power output under low-power input. For example, when the ratio is 12.5, it means that the maximum charging output power of the charging module 120 is 12.5 times the maximum output power of the input module 130. Assuming that the maximum output power of the input module 130 is 40 kilowatts, then the maximum charging output power of the charging module 120 is greater than or equal to 500 kilowatts.

[0443] Meanwhile, the ratio of the maximum charging output power of the charging module 120 to the maximum output power of the input module 130 is less than or equal to 15, for example, can be 15, 12.5, 10.3, 9, 7, and 6, and the like. For example, when the ratio is 6, it means that the maximum charging output power of the charging module 120 is 6 times the maximum output power of the input module 130. Assuming that the maximum output power of the input module 130 is 150 kW, then the maximum charging output power of the charging module 120 is less than or equal to 900 kW.

[0444] It should be noted that when setting the above ratio, the minimum ratio is less than or equal to the maximum ratio. For example, the ratio between the maximum charging output power of the charging module 120 and the maximum output power of the input module 130 is greater than 2 and less than or equal to 15, or greater than 1 and less than or equal to 6, or greater than 6 and less than or equal to 12.5, and the like. The specific setting is selected according to the actual demand.

[0445] In this way, by limiting the ratio between the maximum charging output power of the charging module 120 and the maximum output power of the input module 130, a higher cost performance and better performance can be achieved in the case of small power input and large power output.

[0446] It can be understood that the maximum charging output power of the charging module 120 and the rated charging output power satisfy a certain multiple relationship, for example, a multiple relationship of 1.1-1.2. Meanwhile, the maximum output power of the input module 130 and the rated output power satisfy a certain multiple relationship, for example, a multiple relationship of 1.1-1.2. Therefore, the ratio between the rated charging output power of the charging module 120 and the rated output power of the input module 130 can also be greater than 1 and less than or equal to 15.

[0447] In actual application, the ratio between the maximum charging output power of the charging module 120 and the maximum output power of the input module 130 can be limited, or the ratio between the rated charging output power of the charging module 120 and the rated output power of the input module 130 can be limited, or both can be limited.

[0448] In the above embodiments, by limiting the ratio of the maximum charging output power of the charging module and the maximum output power of the input module, and / or limiting the ratio of the rated charging output power of the charging module and the rated output power of the input module, on the one hand, the current impact, overheating and other problems caused by the charging module 120 due to instantaneous excessive power input can be reduced. On the other hand, the input module 130 can charge the energy storage module 110 at a small power, and the energy storage module can output to the charging module 120 at a controllable large power, realizing small power input to the energy storage module 110 and large power output of the charging module 120. In addition, the energy storage module 110 can flexibly adjust the output power according to the amount of electricity stored and the power demand of the power consumption equipment, so that the charging device 100 can reasonably distribute the electric energy, reduce unnecessary energy consumption, improve the performance-price ratio of the charging device 100, and enable the charging device 100 to run smoothly when the small power input is large power output.

[0449] In some embodiments, each energy storage unit includes a battery subunit, and the ratio between the rated output power of the input module 130 and the rated energy of the battery subunit is greater than or equal to 1 / n1, where n1 is in the range of 1-4.

[0450] Specifically, the rated energy of the battery subunit refers to the energy capacity specified when the battery subunit is designed, which represents the maximum energy value that the battery subunit can store or output under normal working conditions, with the unit being kilowatt-hour. The rated output power of the input module 130 is greater than or equal to the rated energy of the battery subunit divided by the coefficient n1 / 100%, where n1 can be 1, 1.4, 2, 3, and 4, etc. By specifying that the rated output power of the input module is greater than the rated energy of the battery subunit divided by the coefficient n1, when the input power of the input module 130 is small, the rated energy of the battery subunit is small, so that the input power and the rated energy of the battery subunit are matched, and the charging of the battery subunit by the input module 130 is not too slow, which affects the use of the energy storage unit. At the same time, the small rated energy of the battery subunit also means that the battery subunit has a small volume, so that the energy storage unit occupies a small area and is easy to install. Further, the small volume of the energy storage unit realizes small power input and large power output, and improves the user experience.

[0451] In some embodiments, each energy storage unit includes a battery subunit, and the ratio between the rated energy of the battery subunit and the rated charging output power of the charging module 120 is greater than or equal to 1 / (n2*n3), where n2 is in the range of 94%-99% and n3 is in the range of 4-6.

[0452] That is, the rated energy of the battery subunit is greater than or equal to the rated charging output power of the charging module 120 / (n2*n3)*100%, where n2 can be 94%, 96%, 98.5%, 99%, etc., and n3 can be 4, 5, 5.5, 6, etc. In this way, the charging performance is ensured, and the reliability of the charging device 100 is taken into account. When the rated energy of the battery subunit matches the rated charging output power of the charging module 120, the battery subunit can stably provide energy for the charging module 120 during the charging process, reducing the instability or interruption of the charging power caused by insufficient energy supply. Taking n2=94% and n3=6 as an example, the larger denominator requires the battery subunit to have a relatively high rated energy to match the power of the charging module 120. This allows the charging device 100 to work stably and continuously during long-time and high-power charging, reduces the probability of failure, reduces maintenance costs, thereby prolonging the service life of the charging device 100 and improving the cost performance.

[0453] In some embodiments, each energy storage unit includes a battery subunit, the ratio between the rated energy of the battery subunit and the rated power of the battery subunit is less than or equal to 1 / 3, and / or the volumetric energy density of the battery subunit is greater than 380 Wh / L.

[0454] That is, the ratio of the rated energy of the battery subunit to the rated power is not greater than 1:3. For example, when the rated power of the battery subunit is 350 kW, the rated energy of the battery subunit is 58 kWh. In this way, the cost performance of the entire charging device can be improved.

[0455] The volumetric energy density of the battery subunit is greater than or equal to 380 Wh / L, for example, it can be 380 Wh / L, 400 Wh / L, 600 Wh / L, or 900 Wh / L, etc. It can be understood that the higher the energy density of the battery subunit, the smaller the corresponding volume, thereby saving space and reducing construction costs, while providing high-power output.

[0456] When the charging device 100 outputs high power (the maximum charging output power of the charging module is greater than 350 kW), the ratio between the rated energy of the battery subunit and the rated power of the battery subunit is less than or equal to 1 / 3, and / or the volumetric energy density of the battery subunit is greater than 380 Wh / L. This allows the rated energy of the battery subunit to match the rated power, reducing the power grid fluctuations caused by the need for power grid power supply due to insufficient rated energy of the battery subunit caused by high-power output. This is beneficial to improve the reliability and stability of the charging device 100, and allows the charging device 100 to work stably and continuously during high-power output, reduces the probability of failure, reduces maintenance costs, thereby prolonging the service life of the charging device 100 and improving the cost performance.

[0457] In some embodiments, each energy storage unit includes a battery subunit, and the maximum discharge rate of the battery subunit is greater than or equal to 4C, for example, greater than or equal to 5C, 6C, 7C, or 8C, etc. In this way, a large power output can be provided.

[0458] It should be noted that the above parameters can be superimposed. For example, when the maximum charging output power of the charging module 120 is greater than or equal to 350 kW, the maximum output power of the battery subunit is greater than or equal to 350 kW, the rated power of the battery subunit is greater than or equal to 350 kW, the rated energy of the battery subunit is greater than or equal to 58 kWh, and the maximum discharge rate of the battery subunit is greater than or equal to 4C, the maximum output power of the input module 130 can be less than or equal to 150 kW.

[0459] It should be noted that the above parameters related to the battery subunit also apply to the energy storage unit and / or the energy storage module in some cases, that is, in some cases, the above parameters apply to the energy storage unit, the energy storage module, and the battery subunit. For example, when the energy storage unit only includes a battery subunit, the related parameters of the battery subunit are also the related parameters of the energy storage unit, and further, when the energy storage module 110 includes an energy storage unit, the related parameters of the battery subunit are also the related parameters of the energy storage module 110; and the like.

[0460] It should be noted that the energy storage unit can include one or more battery subunits, and the plurality of battery subunits can be connected in series, parallel, or series-parallel. Each battery subunit can be a single cell or a plurality of single cells connected in series, parallel, or series-parallel. For example, a single cell can include 10-100, and 2-6 battery subunits can be obtained by combining single cells, and 2-6 battery subunits can be connected in series and / or parallel, so that the energy storage unit can reach 80-150 kWh through 2-6 battery subunits. For example, 80 kWh can be obtained by combining 2 single cells; for example, 150 kWh can be obtained by combining 100 single cells; for example, 90 kWh can be obtained by combining 80 single cells; and the like.

[0461] In the above embodiments, by limiting the proportional relationship of the rated energy and rated power of the battery subunit, the rated output power of the input module, and the rated charging output power of the charging module, etc., the entire charging device can have a high cost performance.

[0462] In some embodiments, one or more energy storage units are connected in series and / or parallel between the second positive power supply end and the second negative power supply end of the energy storage module 110 through the first positive power supply end and the first negative power supply end to provide first direct current.

[0463] Specifically, when the energy storage unit is one, the first positive power terminal of the energy storage unit is connected with the second positive power terminal of the energy storage module 110, and the first negative power terminal of the energy storage unit is connected with the second negative power terminal of the energy storage module 110, and the first direct current is provided through the energy storage unit.

[0464] When the energy storage unit is multiple, the multiple energy storage units can be connected in series, in parallel, or in series and parallel. For example, referring to Figure 8 , the multiple energy storage units are connected in series through their first positive power terminals and first negative power terminals between the second positive power terminal and the second negative power terminal of the energy storage module 110; for another example, referring to Figure 10 , the multiple energy storage units are connected in parallel through their first positive power terminals and first negative power terminals between the second positive power terminal and the second negative power terminal of the energy storage module 110; for another example, the multiple energy storage units can be connected in series and then in parallel, or in parallel and then in series between the second positive power terminal and the second negative power terminal of the energy storage module 110. The first direct current is provided through the multiple energy storage units in series, in parallel, or in series and parallel, and the specific connection mode can be selected based on the actual situation.

[0465] In the above embodiments, the multiple energy storage units can be connected in series, in parallel, or in series and parallel, and the free access of the energy storage units can be realized to meet different charging power requirements.

[0466] In some embodiments, referring to Figures 11a-11d , each energy storage unit includes a battery subunit, and each energy storage unit is configured to provide the second direct current based on the electrical energy of the battery subunit.

[0467] For example, referring to Figure 11a , the energy storage unit 1 includes a battery subunit BAT1,..., the energy storage unit n-1 includes a battery subunit BATn-1, and the energy storage unit n includes a battery subunit BATn. Each energy storage unit provides the second direct current based on the electrical energy of the battery subunit, and the multiple energy storage units provide the first direct current to the charging module 120 through series and / or parallel connection.

[0468] In some embodiments, referring to Figure 11b , at least part of the one or more energy storage units further includes a first power conversion subunit, and the first power conversion subunit is connected with the corresponding battery subunit and the first positive power terminal and the first negative power terminal of the energy storage unit, and is configured to convert the electrical energy of the battery subunit into the second direct current; wherein, in the case that the energy storage unit does not include the first power conversion subunit, the battery subunit is directly connected with the first positive power terminal and the first negative power terminal of the corresponding energy storage unit to provide the second direct current.

[0469] Specifically, when the energy storage unit is one, the energy storage unit further comprises a first power conversion subunit to convert the electric energy of the battery subunit into the second direct current.

[0470] When the energy storage unit is multiple, a first power conversion subunit can be arranged in each of the multiple energy storage units, or a first power conversion subunit can be arranged in part of the multiple energy storage units. For example, in the energy storage unit 1, the energy storage unit 2, and the energy storage unit n-1, a first power conversion subunit is arranged, and in the energy storage unit n, no first power conversion subunit is arranged. Figure 11b In the energy storage unit 1, the energy storage unit 2, and the energy storage unit n-1, the first power conversion subunit is arranged, and in the energy storage unit n, no first power conversion subunit is arranged.

[0471] In some embodiments, when the battery subunit discharges externally, the maximum output power of the first power conversion subunit is greater than or equal to 350 kilowatts, and / or the rated output power is greater than or equal to 310 kilowatts. When the battery subunit is charged, the ratio of the maximum output power of the input module 130 to the maximum output power of the first power conversion subunit is not greater than 1:4, and / or the ratio of the rated output power of the input module 130 to the rated output power of the first power conversion subunit is not greater than 1:4.

[0472] In the above embodiments, part or all of the multiple energy storage units can be provided with a first power conversion subunit, and the electric energy of the battery subunit is converted by the first power conversion subunit to provide the second direct current, which can improve the flexibility of charging. At the same time, by arranging part of the first power conversion subunits, the cost can be reduced while meeting the charging demand, and this mode can realize the access of energy storage units with and without first power conversion subunits, and has high applicability.

[0473] In some embodiments, refer to Figure 11cAt least some of the one or more energy storage units further include a first switch subunit, which is respectively connected to the first positive power supply terminal and the first negative power supply terminal of the corresponding battery subunit and the energy storage unit, and is configured to connect the corresponding battery subunit to the first positive power supply terminal and the first negative power supply terminal of the energy storage unit when it is turned on to provide a second direct current; wherein, when the energy storage unit does not include the first switch subunit, the battery subunit is directly connected to the first positive power supply terminal and the first negative power supply terminal of the corresponding energy storage unit to provide the second direct current.

[0474] Specifically, when there is only one energy storage unit, the energy storage unit also includes a first switch subunit. When the first switch subunit is turned on, the battery subunit is connected to the first positive power supply terminal and the first negative power supply terminal of the energy storage unit to provide a second direct current; in abnormal circumstances, such as abnormalities in the battery subunit or the charging module 120, the first switch subunit is disconnected to reduce the further occurrence of abnormal accidents; when the battery subunit does not need to work, such as when the energy storage unit does not need to work based on power requirements, the first switch subunit is disconnected to stop the battery subunit from providing the second direct current.

[0475] When there are multiple energy storage units, a first switch sub-unit may be provided in each of the multiple energy storage units, or a first switch sub-unit may be provided in some of the multiple energy storage units. Figure 11c In the embodiment, energy storage unit 1 includes a battery subunit BAT1 and a first switch subunit 1, the first switch subunit 1 being connected to the first positive power terminal and the first negative power terminal of the battery subunit BAT1 and the energy storage unit 1, respectively, and controlling the connection and disconnection between the battery subunit BAT1 and the first positive power terminal and the first negative power terminal of the energy storage unit 1 by the first switch subunit 1 to selectively provide a second direct current; ...; energy storage unit n-1 includes a battery subunit BATn-1 and a first switch subunit n-1, the first switch subunit n-1 being connected to the first positive power terminal and the first negative power terminal of the battery subunit BATn-1 and the energy storage unit n-1, respectively, and controlling the connection and disconnection between the battery subunit BATn-1 and the first positive power terminal and the first negative power terminal of the energy storage unit n-1 by the first switch subunit n-1 to selectively provide a second direct current; energy storage unit n includes a battery subunit BATn, the battery subunit BATn being directly connected to the first positive power terminal and the first negative power terminal of the energy storage unit n, to provide a second direct current.

[0476] In the above embodiment, some or all of the multiple energy storage units can be provided with a first switch subunit, which selectively controls the battery subunit to provide the second DC power through the first switch subunit, thereby improving charging flexibility and protection in abnormal situations.

[0477] In some embodiments, referenceFigure 11d At least part of the one or more energy storage units further comprises a first power conversion subunit and a first switch subunit, the first power conversion subunit and the first switch subunit are connected in series between the first positive power terminal and the first negative power terminal of the corresponding battery subunit and the energy storage unit, the first power conversion subunit is configured to convert the electric energy of the battery subunit into the second direct current when the corresponding first switch subunit is turned on; wherein, when the energy storage unit does not comprise the first power conversion subunit and the first switch subunit, the battery subunit is directly connected to the first positive power terminal and the first negative power terminal of the corresponding energy storage unit to provide the second direct current.

[0478] Specifically, when the energy storage unit is one, the energy storage unit further comprises a first power conversion subunit and a first switch subunit, the first power conversion subunit converts the electric energy of the battery subunit into the second direct current when the first switch subunit is turned on; in abnormal situations, such as abnormality of the battery subunit or the charging module 120, the first switch subunit is turned off, and the first power conversion subunit stops working to reduce further occurrence of abnormal accidents; when the battery subunit does not need to work, such as when the energy storage unit does not need to work based on power demand, the first switch subunit is turned off, and the first power conversion subunit stops working to make the battery subunit stop providing the second direct current.

[0479] When the energy storage unit is multiple, a first switch subunit and a first power conversion subunit can be provided in each of the multiple energy storage units, or a first switch subunit and a first power conversion subunit can be provided in part of the multiple energy storage units. For example, in the energy storage unit 1, the energy storage unit 2,..., and the energy storage unit n, the energy storage unit 1 comprises the battery subunit BAT1, the first switch subunit 1, and the first power conversion subunit 1, the first switch subunit 1 and the first power conversion subunit 1 are connected in series between the first positive power terminal and the first negative power terminal of the battery subunit BAT1 and the energy storage unit 1, the first power conversion subunit 1 converts the electric energy of the battery subunit BAT1 into the second direct current when the first switch subunit 1 is turned on; the energy storage unit 2 comprises the battery subunit BAT2, the first switch subunit 2, and the first power conversion subunit 2, the first switch subunit 2 and the first power conversion subunit 2 are connected in series between the first positive power terminal and the first negative power terminal of the battery subunit BAT2 and the energy storage unit 2, the first power conversion subunit 2 converts the electric energy of the battery subunit BAT2 into the second direct current when the first switch subunit 2 is turned on; the energy storage unit n comprises the battery subunit BATn, the battery subunit BATn is directly connected to the first positive power terminal and the first negative power terminal of the energy storage unit n to provide the second direct current. Figure 11d

[0480] ​It should be noted that in some embodiments, a part of the energy storage units can include the first switch subunit, and the other part can include the first power conversion subunit, which is not limited here.

[0481] In the above embodiments, part or all of the plurality of energy storage units can be provided with the first switch subunit and the first power conversion subunit, so as to improve the flexibility of charging and the protection capability in abnormal situations.

[0482] In some embodiments, the first power conversion subunit is a bidirectional DCDC subunit, and the charging and discharging of the battery subunit are realized through the bidirectional DCDC subunit. The bidirectional DCDC subunit includes but is not limited to a BUCK-BOOST circuit and the like, which is not limited here.

[0483] In some embodiments, referring to Figure 12a The input module 130 includes an input interface (X, Y) connected to the second positive power supply end and the second negative power supply end of the energy storage module 110, and is configured to provide charging energy for each energy storage unit based on the third direct current provided by the first external power supply 210.

[0484] Specifically, the first external power supply 210 is used to generate the third direct current and transmit it to the energy storage module 110 through the input interface to charge each energy storage unit in the energy storage module 110. For example, the first external power supply 210 can include a first transformer and a first AC-DC conversion module. The primary winding of the first transformer is connected to the AC power grid to convert the second alternating current provided by the AC power grid into the first alternating current. The first AC-DC conversion module is connected to the secondary winding of the first transformer and the input interface, respectively, to convert the first alternating current into the third direct current and transmit it to the energy storage module 110 through the input interface.

[0485] The first AC-DC conversion module can be a unidirectional ACDC subunit or a bidirectional ACDC subunit. When the first AC-DC conversion module is a bidirectional ACDC subunit, not only the charging of the energy storage module 110 can be realized, but also the power of the energy storage module 110 can be fed to the AC power grid. The specific circuit structure of the unidirectional ACDC subunit or the bidirectional ACDC subunit is not limited here.

[0486] It should be noted that in this example, the maximum output power and the rated output power of the input module 130 are the maximum output power and the rated output power of the first external power supply 210.

[0487] In the above embodiments, in the case of a direct current provided by an external power supply, the battery subunit can be charged through the input interface.

[0488] In some embodiments, referring to Figure 12bThe input module 130 includes a second power conversion subunit 131 connected to the second positive power supply end and the second negative power supply end of the energy storage module 110, and configured to provide charging energy for each energy storage unit based on the first alternating current provided by the second external power supply 220.

[0489] Specifically, the second external power supply 220 is configured to generate the first alternating current and provide the first alternating current to the second power conversion subunit 131 in the input module 130, so as to charge each battery subunit in the energy storage module 110 through the second power conversion subunit 131. For example, the second external power supply 220 can include a first transformer, a primary winding of the first transformer being connected to an alternating current grid, and the second power conversion subunit 131 being connected to a secondary winding of the first transformer and the energy storage module 110 respectively. The first transformer converts the second alternating current provided by the alternating current grid into the first alternating current, and provides the first alternating current to the second power conversion subunit 131. The second power conversion subunit 131 converts the first alternating current into the third direct current to charge the energy storage module 110.

[0490] The second power conversion subunit 131 can be a unidirectional ACDC subunit or a bidirectional ACDC subunit. When the second power conversion subunit 131 is a bidirectional ACDC subunit, the second power conversion subunit 131 can not only charge the energy storage module 110, but also feed the electrical energy of the energy storage module 110 to the alternating current grid. The specific circuit structure of the unidirectional ACDC subunit or the bidirectional ACDC subunit is not limited here.

[0491] It should be noted that, in this example, the maximum output power and the rated output power of the input module 130 are the maximum output power and the rated output power of the second power conversion subunit 131.

[0492] In the above embodiment, the battery subunit can be charged by the second power conversion subunit when the external power supply provides the alternating current.

[0493] In some embodiments, referring to Figure 13a , 13b , 16a, 16b, 18a, 18b, and Figures 21-29 , the charging module 120 includes a charging module conversion unit and at least one charging gun 122. The charging gun 122 is connected to the energy storage module 110 through the charging module conversion unit.

[0494] The number of charging guns 122 can be one, two or more. For example, the number of charging guns 122 is two, and the maximum charging output power or the rated output power of each charging gun 122 can be 500 kW. The charging guns 122 can simultaneously charge the same electric device, which can be an electric vehicle. Each charging gun 122 can also charge different electric devices separately.

[0495] When the number of charging guns 122 is multiple, the multiple charging guns 122 can be connected with the energy storage module 110 through the same charging module conversion unit, and each charging gun 122 can also be connected with the energy storage module 110 through a charging module conversion unit. The charging module conversion unit can be a DCDC conversion unit, specifically a unipolar one-way DCDC conversion unit or a unipolar two-way DCDC conversion unit, or a bipolar one-way DCDC conversion unit or a bipolar two-way DCDC conversion unit.

[0496] The charging module conversion unit can flexibly adjust the voltage, current and other parameters according to the direct current output by the energy storage module 110 and the demand of the charging gun 122 connected device (such as an electric vehicle), to realize efficient charging output. The configuration of at least one charging gun 122 makes the charging device 100 can simultaneously charge one or more electric devices. In a public charging area, such as a parking lot, a charging station, etc., multiple users can simultaneously use different charging guns 122 to charge their electric vehicles, which improves the use efficiency and service ability of the charging device 100, meets the use requirements in large-scale charging demand scenarios, effectively alleviates the charging queuing and waiting problem, and improves the user experience.

[0497] In some embodiments, referring to Figure 13a , the charging module 120 includes a third power conversion subunit 121 and a charging gun 122, the positive input end and the negative input end of the third power conversion subunit 121 are connected with the second positive power supply end and the second negative power supply end of the energy storage module 110, respectively, the positive output end and the negative output end of the third power conversion subunit 121 are connected with the positive input end and the negative input end of the charging gun 122, respectively, and the third power conversion subunit 121 is configured to convert the first direct current into a fourth direct current for charging output through the charging gun 122.

[0498] Specifically, when charging the to-be-charged device, one or more energy storage units provide the second direct current, so that the energy storage module 110 provides the first direct current, which is converted into the fourth direct current by the third power conversion subunit 121 and provided to the charging gun 122, and then provided to the to-be-charged device by the charging gun 122, to charge the to-be-charged device.

[0499] In this example, the third power conversion subunit 121 has bipolarity, that is, has a positive input end and a negative input end, at this time, the positive input end and the negative input end of the third power conversion subunit 121 are directly connected with the second positive power end and the second negative power end of the energy storage module 110, the positive output end and the negative output end of the third power conversion subunit 121 are directly connected with the positive input end and the negative input end of the charging gun 122, and the negative input end of the charging gun 122 and the second negative power end of the energy storage module 110 are not shared. In this way, it is suitable for the application scenario that the third power conversion subunit 121 has bipolarity.

[0500] The third power conversion subunit 121 can be a bipolar unidirectional DCDC subunit or a bipolar bidirectional DCDC subunit. When the third power conversion subunit 121 is a bipolar bidirectional DCDC subunit, not only can it charge the device to be charged, but also can feed the electrical energy of the device to be charged to the energy storage module 110, and also can feed to the AC power grid in the foregoing example through the input module 130, finally realizing the free conversion of electrical energy among the grid, charging and storage.

[0501] In some embodiments, referring to Figure 13b , the charging module 120 includes a fourth power conversion subunit 123 and a charging gun 122, the positive input end of the fourth power conversion subunit 123 is connected with the second positive power end of the energy storage module 110, the positive output end of the fourth power conversion subunit 123 is connected with the positive input end of the charging gun 122, the negative input end of the charging gun 122 is connected with the second negative power end of the energy storage module 110, and the fourth power conversion subunit 123 is configured to convert the first direct current into the fourth direct current for charging output through the charging gun 122.

[0502] Specifically, when charging the device to be charged, one or more energy storage units provide the second direct current, so that the energy storage module 110 provides the first direct current, which is converted into the fourth direct current by the fourth power conversion subunit 123 and provided to the charging gun 122, and then provided to the device to be charged by the charging gun 122, so as to charge the device to be charged.

[0503] In this example, the fourth power conversion subunit 123 has unipolarity, that is, only has a positive input end, at this time, the positive input end of the fourth power conversion subunit 123 is directly connected with the second positive power end of the energy storage module 110, the positive output end of the fourth power conversion subunit 123 is directly connected with the positive input end of the charging gun 122, and the negative input end of the charging gun 122 is directly connected with the second negative power end of the energy storage module 110, that is, the negative input end of the charging gun 122 and the second negative power end of the energy storage module 110 are shared. In this way, it is suitable for the application scenario that the fourth power conversion subunit 123 has unipolarity, and the cost is low.

[0504] The fourth power conversion subunit 123 can be a single-polarity unidirectional DCDC subunit or a single-polarity bidirectional DCDC subunit. When the fourth power conversion subunit 123 is a single-polarity bidirectional DCDC subunit, not only can the device to be charged be charged, but also the electrical energy of the device to be charged can be fed to the energy storage module 110, and can also be fed to the AC power grid in the foregoing example through the input module 130, finally realizing the free conversion of electrical energy among the grid, charging, and storage.

[0505] In the above embodiment, by sharing or not sharing the negative input end of the charging gun, different power supply scenarios can be applied, thereby improving the selection range when selecting the circuit structure.

[0506] In some embodiments, with reference to Figure 14 , the energy storage module 110 further includes a selection unit 111 connected to one or more energy storage units, configured to select at least one energy storage unit from the one or more energy storage units to be connected to the second positive power supply end and the second negative power supply end of the energy storage module 110 to provide the first direct current.

[0507] Specifically, when charging, the selection unit 111 can select one energy storage unit 1 to be connected to the second positive power supply end and the second negative power supply end of the energy storage module 110 to provide the first direct current, or select all energy storage units 1,..., energy storage unit n-1, and energy storage unit n to be connected to the second positive power supply end and the second negative power supply end of the energy storage module 110 to provide the first direct current. Then, the charging module 120 performs charging output based on the first direct current.

[0508] In the above embodiment, the energy storage units are selectively controlled to output by the selection unit, which can improve the flexibility of charging and meet different charging needs.

[0509] In some embodiments, with reference to Figure 15 , the second positive power supply end and the second negative power supply end of the energy storage module 110 each include one, the selection unit 111 includes a plurality of second switch subunits, each second switch subunit is connected to one energy storage unit, each second switch subunit is connected in series between the first positive power supply end of the corresponding energy storage unit and the second positive power supply end of the energy storage module 110, and the first negative power supply end of one or more energy storage units is respectively connected to the second negative power supply end of the energy storage module 110. The second switch subunit is configured to connect the first positive power supply end of the corresponding energy storage unit to the second positive power supply end of the energy storage module 110 in the on state.

[0510] Specifically, the selection unit 111 includes a second switch subunit K1, a second switch subunit Kn-1, and a second switch subunit Kn, the second switch subunit K1 is connected in series between the first positive power supply end of the energy storage unit 1 and the second positive power supply end of the energy storage module 110, the second switch subunit Kn-1 is connected in series between the first positive power supply end of the energy storage unit n-1 and the second positive power supply end of the energy storage module 110, and the second switch subunit Kn is connected in series between the first positive power supply end of the energy storage unit n and the second positive power supply end of the energy storage module 110. By controlling the on-off of the second switch subunit, the corresponding energy storage unit is selected to provide the second direct current, so that the energy storage module 110 provides the first direct current, and at this time the charging module 120 converts the first direct current into the fourth direct current to charge the device to be charged.

[0511] In the above embodiment, by setting a second positive power supply end and selectively controlling the energy storage unit to provide the second direct current through the selection unit, the flexibility of charging can be improved to meet the charging demand.

[0512] In some embodiments, referring to Figure 16a , the charging module 120 includes a fifth power conversion subunit 124 and a charging gun 122, the positive input end and the negative input end of the fifth power conversion subunit 124 are connected to the second positive power supply end and the second negative power supply end of the energy storage module 110, the positive output end and the negative output end of the fifth power conversion subunit 124 are connected to the positive input end and the negative input end of the charging gun 122, and the fifth power conversion subunit 124 is configured to convert the first direct current into the fourth direct current for charging output through the charging gun 122.

[0513] It should be noted that the connection relationship of the fifth power conversion subunit 124 with the charging gun 122 and the energy storage module 110 and the structure of the fifth power conversion subunit 124 are described above in relation to the third power conversion subunit 121, and will not be described here.

[0514] In some embodiments, referring to Figure 16b , the charging module 120 includes a sixth power conversion subunit 125 and a charging gun 122, the positive input end of the sixth power conversion subunit 125 is connected to the second positive power supply end of the energy storage module 110, the positive output end of the sixth power conversion subunit 125 is connected to the positive input end of the charging gun 122, the negative input end of the charging gun 122 is connected to the second negative power supply end of the energy storage module 110, and the sixth power conversion subunit 125 is configured to convert the first direct current into the fourth direct current for charging output through the charging gun 122.

[0515] It should be noted that for the connection relationship of the sixth power conversion subunit 125 with the charging gun 122 and the energy storage module 110 and the structure of the sixth power conversion subunit 125, please refer to the foregoing description of the fourth power conversion subunit 123, and details are not repeated here.

[0516] In some embodiments, referring to Figure 17 , the second positive power supply end of the energy storage module 110 includes multiple, the second negative power supply end of the energy storage module 110 includes one, the selection unit 111 includes multiple second switch subunits, each second switch subunit is connected with one energy storage unit and one second positive power supply end, each second switch subunit is connected in series between the first positive power supply end of the corresponding energy storage unit and the corresponding second positive power supply end, and the first negative power supply end of one or more energy storage units is connected with the second negative power supply end of the energy storage module 110, respectively. The second switch subunit is configured to connect the first positive power supply end of the corresponding energy storage unit with the corresponding second positive power supply end in the on state.

[0517] Specifically, the selection unit 111 includes the second switch subunit K1,..., the second switch subunit Kn-1, and the second switch subunit Kn, wherein the second switch subunit K1 is connected in series between the first positive power supply end of the energy storage unit 1 and one second positive power supply end of the energy storage module 110,..., the second switch subunit Kn-1 is connected in series between the first positive power supply end of the energy storage unit n-1 and another second positive power supply end of the energy storage module 110, and the second switch subunit Kn is connected in series between the first positive power supply end of the energy storage unit n and another second positive power supply end of the energy storage module 110. By controlling the on-off of the second switch subunit, the corresponding energy storage unit is selected to provide the second direct current, so that the energy storage module 110 provides the first direct current, and at this time the charging module 120 converts the first direct current into the fourth direct current to charge the device to be charged. It should be noted that the first direct current includes multiple second direct currents, and the charging module 120 can selectively convert one or more second direct currents into the fourth direct current.

[0518] In the above embodiment, by providing multiple second positive power supply ends and selectively controlling the energy storage unit to provide the second direct current through the selection unit, the flexibility of charging can be improved to meet the charging demand.

[0519] In some embodiments, referring to Figure 18a , the charging module 120 includes multiple seventh power conversion subunits and the charging gun 122, the positive input end and the negative input end of each seventh power conversion subunit are connected with one second positive power supply end and a second negative power supply end, respectively, the positive output end and the negative output end of each seventh power conversion subunit are connected with the positive input end and the negative input end of the charging gun, respectively, and the multiple seventh power conversion subunits are configured to convert the first direct current into the fourth direct current for charging output through the charging gun.

[0520] Specifically, the plurality of seventh power conversion sub-units are respectively seventh power conversion sub-unit 1,..., seventh power conversion sub-unit n-1 and seventh power conversion sub-unit n, wherein the positive input end of the seventh power conversion sub-unit 1 is connected with one second positive power supply end,..., the positive input end of the seventh power conversion sub-unit n-1 is connected with another second positive power supply end, the positive input end of the seventh power conversion sub-unit n is connected with another second positive power supply end, and the negative input end of the seventh power conversion sub-unit 1,..., the negative input end of the seventh power conversion sub-unit n-1 and the negative input end of the seventh power conversion sub-unit n are all connected with the second negative power supply end. The positive output end and the negative output end of the seventh power conversion sub-unit 1,..., the seventh power conversion sub-unit n-1 and the seventh power conversion sub-unit n are respectively connected with the positive input end and the negative input end of the charging gun 122.

[0521] In this example, each seventh power conversion sub-unit can convert the second direct current of the corresponding energy storage unit into fifth direct current, and finally a plurality of seventh power conversion sub-units output fourth direct current.

[0522] The seventh power conversion sub-unit can be a bipolar unidirectional DCDC sub-unit or a bipolar bidirectional DCDC sub-unit. When the seventh power conversion sub-unit is a bipolar bidirectional DCDC sub-unit, not only can it charge the device to be charged, but also can feed the electrical energy of the device to be charged to the energy storage module 110, and also can be fed to the AC power grid in the foregoing example through the input module 130, finally realizing the free conversion of electrical energy among the grid, charging and storage.

[0523] In some embodiments, referring to Figure 18b , the charging module 120 has a plurality of eighth power conversion sub-units and the charging gun 122, the positive input end of each eighth power conversion sub-unit is connected with one second positive power supply end, the positive output end of each eighth power conversion sub-unit is connected with the positive input end of the charging gun 122, the negative input end of the charging gun 122 is connected with the second negative power supply end of the energy storage module 110, and the plurality of eighth power conversion sub-units are configured to convert the first direct current into fourth direct current for charging output through the charging gun 122.

[0524] Specifically, the plurality of eighth power conversion sub-units are eighth power conversion sub-unit 1, …, eighth power conversion sub-unit n-1 and eighth power conversion sub-unit n, wherein the positive input end of the eighth power conversion sub-unit 1 is connected with one second positive power supply end, …, the positive input end of the eighth power conversion sub-unit n-1 is connected with another second positive power supply end, the positive input end of the eighth power conversion sub-unit n is connected with still another second positive power supply end, and the positive output ends of the eighth power conversion sub-unit 1, …, the eighth power conversion sub-unit n-1 and the eighth power conversion sub-unit n are all connected with the positive input end of the charging gun 122, and the negative input end of the charging gun 122 is connected with the second negative power supply end of the energy storage module 110.

[0525] In this example, each eighth power conversion sub-unit can convert the second direct current of the corresponding energy storage unit into fifth direct current, and finally the plurality of eighth power conversion sub-units output fourth direct current.

[0526] The eighth power conversion sub-unit can be a single-polarity unidirectional DCDC sub-unit or a single-polarity bidirectional DCDC sub-unit. When the eighth power conversion sub-unit is a single-polarity bidirectional DCDC sub-unit, not only can it charge the device to be charged, but also can feed the electrical energy of the device to be charged to the energy storage module 110 and to the AC power grid in the foregoing example through the input module 130, finally realizing the free conversion of electrical energy among the grid, charging and storage.

[0527] In the above embodiments, the negative input end of the charging gun is shared or not shared, which can be applied to different power supply scenarios, thereby improving the selection range when selecting the circuit structure.

[0528] In some embodiments, referring to Figure 19a , the input module 130 includes a ninth power conversion sub-unit 132 connected with one or more energy storage units and configured to provide charging energy for each energy storage unit based on the first alternating current provided by the second external power supply 220.

[0529] Specifically, the second external power supply 220 is used to generate the first alternating current and provide it to the ninth power conversion sub-unit 132 in the input module 130, so as to charge each battery sub-unit in the energy storage module 110. For example, the second external power supply 220 can include a second transformer, the primary winding of which is connected with the AC power grid, and the secondary winding of which is connected with the ninth power conversion sub-unit 132. The second transformer converts the second alternating current provided by the AC power grid into the first alternating current, which is provided to the ninth power conversion sub-unit 132. The ninth power conversion sub-unit 132 converts the first alternating current into third direct current to charge the energy storage module 110.

[0530] For example, the second external power supply 220 is a three-phase alternating current power supply, and the ninth power conversion subunit 132 is a unidirectional three-phase ACDC subunit or a bidirectional three-phase ACDC subunit. In this case, each phase of the three-phase ACDC subunit is connected to an energy storage unit to charge the corresponding energy storage unit. When the ninth power conversion subunit 132 is a bidirectional three-phase ACDC subunit, not only can the energy storage module 110 be charged, but the electrical energy of the energy storage module 110 can also be fed to the alternating current power grid. In this way, in the three-phase alternating current, a single-phase is implemented by an energy storage unit, and three energy storage units can implement the function of three-phase alternating current, for example, three-phase power frequency alternating current with a phase difference of 120°. The specific circuit structure of the unidirectional three-phase ACDC subunit or the bidirectional three-phase ACDC subunit is not limited here.

[0531] It should be noted that in this example, the maximum output power and the rated output power of the input module 130 are also the maximum output power and the rated output power of the ninth power conversion subunit 132.

[0532] In the above embodiment, when the external power supply provides alternating current, the battery subunit can be charged by the ninth power conversion subunit.

[0533] In some embodiments, referring to Figure 19b The input module 130 includes a plurality of tenth power conversion subunits, each of which is connected to an energy storage unit. The plurality of tenth power conversion subunits are configured to provide charging energy for each energy storage unit based on the first alternating current provided by the second external power supply 220.

[0534] Specifically, the plurality of tenth power conversion subunits are tenth power conversion subunit 1,..., tenth power conversion subunit n-1, and tenth power conversion subunit n. The tenth power conversion subunit 1 is connected to the second external power supply 220 and the energy storage unit 1,..., the tenth power conversion subunit n-1 is connected to the second external power supply 220 and the energy storage unit n-1, and the tenth power conversion subunit n is connected to the second external power supply 220 and the energy storage unit n. Each tenth power conversion subunit can charge the corresponding energy storage unit based on the first alternating current provided by the second external power supply 220.

[0535] For example, the second external power supply 220 is a three-phase alternating current power supply, and the tenth power conversion subunit includes three, each of which is a unidirectional single-phase ACDC subunit or a bidirectional single-phase ACDC subunit. At this time, each of the tenth power conversion subunits is connected to one phase of the three-phase alternating current power supply to charge the corresponding energy storage unit. When the tenth power conversion subunit is a bidirectional single-phase ACDC subunit, not only can the charging of the energy storage module 110 be realized, but the electrical energy of the energy storage module 110 can also be fed to the alternating current power grid, and when feeding, the three bidirectional single-phase ACDC subunits cooperate with each other to form a three-phase alternating current power supply to the three-phase alternating current power grid. In this way, in the three-phase alternating current power supply, the single-phase energy storage unit is realized, and the three energy storage units can realize the function of the three-phase alternating current power supply. The specific circuit structure of the unidirectional single-phase ACDC subunit or the bidirectional single-phase ACDC subunit is not limited here.

[0536] It should be noted that in this example, the maximum output power and the rated output power of the input module 130 are the sum of the maximum output power and the rated output power of the plurality of tenth power conversion subunits.

[0537] In the above embodiment, when the external power supply provides alternating current power, the battery subunit can be charged by the plurality of tenth power conversion subunits.

[0538] In some embodiments, referring to Figure 20 The charging device 100 further includes a wireless communication module 140, and at least part of the energy storage module 110, the input module 130, and the charging module 120 are connected to the wireless communication module 140 to interact with external equipment through the wireless communication module 140.

[0539] It should be noted that in the above embodiment, a variety of charging device architectures are provided, for example, a plurality of energy storage units can be connected in series, connected in parallel, or connected in series and parallel; some or all of the plurality of energy storage units can be provided with a first power conversion subunit, a first switch subunit, or a first power conversion subunit and a first switch subunit; the charging module can use unipolar power conversion subunits or bipolar power conversion subunits, and the negative input end of the corresponding charging pile can be shared or not shared; the single-phase energy storage unit is realized in the three-phase alternating current power supply, and the three energy storage units can realize the function of the three-phase alternating current power supply; the input module can be an alternating current input or a direct current input; and the like.

[0540] In order for those skilled in the art to more clearly understand the present application, specific examples will be described below, but this should not be considered as a limitation of the present application.

[0541] Example one, referring to Figure 21The energy storage module 110 includes a plurality of energy storage units, each of which includes a battery subunit and a first power conversion subunit, which can be a bidirectional DCDC subunit. The plurality of energy storage units are connected in series between a second positive power supply end and a second negative power supply end of the energy storage module 110, and the second positive power supply end and the second negative power supply end of the energy storage module 110 are connected to the DC bus, i.e. the plurality of energy storage units are connected in series to the DC bus. The charging module 120 includes a third power conversion subunit 121 and a charging gun 122. The third power conversion subunit 121 has a high-voltage positive input end and a high-voltage negative input end, and a high-voltage positive output end and a high-voltage negative output end. The third power conversion subunit 121 can be a bipolar bidirectional DCDC subunit. The input module 130 includes a second power conversion subunit 131, which can be a bidirectional ACDC subunit. The second external power supply 220 includes a first transformer connected to an AC power grid.

[0542] When charging the energy storage module 110, the first transformer converts the second AC power provided by the AC power grid into first AC power. After being converted into DC power by the bidirectional ACDC subunit, the DC power charges each battery subunit in the energy storage module 110 through the DC bus.

[0543] When charging the device to be charged, the energy storage unit provides second DC power based on the electrical energy of the battery subunit. The energy storage module 110 obtains first DC power based on the second DC power. The first DC power is converted into fourth DC power by the high-power bipolar bidirectional DCDC subunit, and the fourth DC power charges the device to be charged through the charging gun 122, so as to realize high-power charging and fast charging / super charging of the device to be charged.

[0544] It can be understood that, under the action of the bidirectional ACDC subunit and the bipolar bidirectional DCDC subunit, the electrical energy of the device to be charged can also be fed to the energy storage module 110 or the AC power grid, so as to realize free switching of electrical energy between the device to be charged, the energy storage module 110 and the AC power grid.

[0545] Example two, referring to Figure 22 Compared with the example shown in Figure 21 The difference is that the fourth power conversion subunit 123 only has a high-voltage positive input end and a high-voltage positive output end, and the high-voltage negative input end of the charging gun 122 is directly connected to the second negative power supply end of the energy storage module 110, i.e. the negative poles of the charging gun 122 and the energy storage module 110 are shared. The fourth power conversion subunit 123 can be a unipolar bidirectional DCDC subunit. For the same content, to avoid redundancy, this will not be described here.

[0546] Example three, referring to Figure 23 Compared with the example shown in Figure 21In the example shown, the difference is that the plurality of energy storage units are connected in parallel between the second positive power supply end and the second negative power supply end of the energy storage module 110, i.e., the plurality of energy storage units are connected to the DC bus.

[0547] Example four, referring to Figure 24 The difference of this example compared to Figure 23 In the example shown, the difference is that the fourth power conversion subunit 123 only has a high-voltage positive input end and a high-voltage positive output end, and the high-voltage negative input end of the charging gun 122 is directly connected to the second negative power supply end of the energy storage module 110, i.e., the negative poles of the charging gun 122 and the energy storage module 110 are shared, and the fourth power conversion subunit 123 can be a unipolar bidirectional DCDC subunit.

[0548] Example five, referring to Figure 25 The difference of this example compared to Figure 21 In the example shown, the difference is that part of the plurality of energy storage units includes a battery subunit, and another part of the plurality of energy storage units includes a battery subunit and a first power conversion subunit, for example, the energy storage unit 1 includes a battery subunit, and the energy storage unit n includes a battery subunit and a bidirectional DCDC subunit n.

[0549] Example six, referring to Figure 26 The difference of this example compared to Figure 25 In the example shown, the difference is that the fourth power conversion subunit 123 only has a high-voltage positive input end and a high-voltage positive output end, and the high-voltage negative input end of the charging gun 122 is directly connected to the second negative power supply end of the energy storage module 110, i.e., the negative poles of the charging gun 122 and the energy storage module 110 are shared, and the fourth power conversion subunit 123 can be a unipolar bidirectional DCDC subunit.

[0550] Example seven, referring to Figure 27 The difference of this example compared to Figure 23 In the example shown, the difference is that each energy storage unit includes a battery subunit and a first switch subunit, and the first switch subunit can be a protection switch to protect the energy storage unit in abnormal conditions.

[0551] In the above examples one to seven, the energy storage module 110 and the charging module 120 are connected to the DC bus, i.e., the charging device 100 adopts a DC bus design. When the energy storage module 110 and the charging module 120 are both provided as multiple, multiple charging devices 100 share the DC bus. When the charging device 100 adopts a DC bus design, when the maximum charging output power of the charging device 100 is greater than or equal to 350 kW, the maximum output power of the battery subunit is greater than or equal to 350 kW, the rated power of the battery subunit is greater than or equal to 350 kW, the rated energy of the battery subunit is greater than or equal to 58 kWh, the maximum discharge rate of the battery subunit is greater than or equal to 4C, the maximum output power of the first power conversion subunit is greater than or equal to 350 kW, and the rated power of the first power conversion subunit is greater than or equal to 310 kW. The maximum output power of the input module 130 is less than or equal to 150 kW, and the ratio of the maximum output power of the input module 130 to the maximum output power of the first power conversion subunit is not greater than 1:4.

[0552] Example eight, with reference to Figure 28 , the energy storage module 110 includes three energy storage units 1, 2 and 3, each of which includes a battery subunit, and a selection unit 111 including three second switch subunits K1, K2 and K3. The charging module 120 includes a fifth power conversion subunit 124 having a high-voltage positive input end and a high-voltage negative input end, and a high-voltage positive output end and a high-voltage negative output end, and a charging gun 122. The fifth power conversion subunit 124 can be a bipolar bidirectional DCDC subunit. The input module 130 includes three tenth power conversion subunits, which can be bidirectional single-phase ACDC subunits. The second external power supply 220 includes a second transformer connected to an AC power grid.

[0553] When charging the energy storage module 110, the second transformer converts the second AC power provided by the AC power grid into the first AC power, which is converted into DC power by the bidirectional single-phase ACDC subunit to charge the corresponding battery subunit. Wherein, each bidirectional single-phase ACDC subunit is connected to a phase AC bus, for example, the bidirectional single-phase ACDC subunit 1 is connected to phase A, the bidirectional single-phase ACDC subunit 2 is connected to phase B, and the bidirectional single-phase ACDC subunit 3 is connected to phase C. It should be noted that under the action of the bidirectional single-phase ACDC subunit, when the energy in the energy storage module 110 is fed to the AC power grid, the three bidirectional single-phase ACDC subunits can cooperate with each other to generate three-phase AC power with a phase difference of 120°, so that the output of three-phase AC power can be realized through the three energy storage units.

[0554] When charging the device to be charged, the energy storage unit provides the second direct current based on the electric energy of the battery subunit, the energy storage module 110 selectively outputs the second direct current to obtain the first direct current through the selection unit 111, the first direct current is converted to obtain the fourth direct current through the high-power bipolar bidirectional DCDC subunit, and the fourth direct current is used to charge the device to be charged through the charging gun 122, so as to realize high-power charging and fast charging / super charging of the device to be charged. In some examples, the second switch subunits K1, K2 and K3 can be closed in turn in time sharing mode to keep the electric energy in the three energy storage units consistent.

[0555] It can be understood that, under the action of the bidirectional single-phase ACDC subunit and the bipolar bidirectional DCDC subunit, the electric energy of the device to be charged can also be fed to the energy storage module 110 or the alternating current power grid, so as to realize free switching of the electric energy among the device to be charged, the energy storage module 110 and the alternating current power grid.

[0556] Example nine, with reference to Figure 29 Compared with the examples shown in Figure 28 The difference is that the sixth power conversion subunit 125 only has a high-voltage positive input end and a high-voltage positive output end, the high-voltage negative input end of the charging gun 122 is directly connected to the second negative power supply end of the energy storage module 110, that is, the negative poles of the charging gun 122 and the energy storage module 110 are shared, and the sixth power conversion subunit 125 can be a unipolar bidirectional DCDC subunit.

[0557] In the above-mentioned examples eight to nine, the energy storage module 110 and the charging module 120 are connected to the alternating current bus, that is, the charging device 100 adopts an alternating current bus design. When the energy storage module 110 and the charging module 120 are both provided as a plurality of modules, a plurality of charging devices 100 share the alternating current bus.

[0558] In the above-mentioned examples one to nine, the charging device 100 can communicate with external devices, including but not limited to cloud services / monitoring platforms, through the wireless communication module 140 to realize 4G / 5G communication, etc. According to the peak and valley time periods of the region where the charging device 100 is located, the cloud services / monitoring platforms select appropriate peak and valley time periods and send them to the charging device 100, so that the charging device 100 realizes peak shaving and valley filling. For example, during the peak period of the alternating current power grid, the alternating current power grid does not charge the energy storage module 110, and during the valley period of the alternating current power grid, the energy storage module 110 is slowly charged through the alternating current power grid.

[0559] It should be noted that the above-mentioned examples one to nine are only exemplary descriptions, and based on the inventive concept of the present application, through reasonable setting of the foregoing architecture, they should all be within the protection scope of the present application.

[0560] To further illustrate the implementation of the scheme that the rated charging output power of the charging module of the present application is greater than or equal to 290 kW, the following will be described in detail with respect to the battery sub-units.

[0561] In the present application, each energy storage unit can include a battery sub-unit, the battery sub-unit can include one or more single cells, the single cell can include an electrode assembly and an electrolyte, the electrode assembly includes a positive electrode tab, a negative electrode tab and a separator film. The positive electrode tab includes a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector, and the positive electrode film layer includes a positive electrode active material. The negative electrode tab includes a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, and the negative electrode film layer includes a negative electrode active material. Optionally, the single cell further includes a shell, and the electrode assembly and the electrolyte are contained in the shell. The negative electrode film layer includes at least one film layer, which can be a single layer film layer or at least two layer film layers. Optionally, the negative electrode film layer includes at least two layer film layers. Similarly, the positive electrode film layer can be a single layer film layer or at least two layer film layers. During the charging and discharging process of the single cell, active ions such as lithium ions are inserted and extracted between the positive electrode tab and the negative electrode tab, and the electrolyte plays a role in conducting active ions between the positive electrode tab and the negative electrode tab.

[0562] The following will be specifically described with respect to the electrolyte, the positive electrode tab, the negative electrode tab and the separator film:

[0563] [Electrolyte]

[0564] In some embodiments, the electrolyte includes an electrolyte salt, and the electrolyte salt includes lithium hexafluorophosphate, and the concentration of the lithium hexafluorophosphate is in the range of 0.5 mol / L-1.0 mol / L.

[0565] By setting the electrolyte to include lithium hexafluorophosphate with the above concentration, the battery sub-unit has a higher ionic conductivity, thereby improving the charging rate of the charging device, and also makes the battery sub-unit have higher interface stability and higher thermal stability; lithium hexafluorophosphate has less influence on the severity of thermal runaway, so that the battery sub-unit has a suitable severity of thermal runaway, and the risk of thermal diffusion is lower, so that the charging device has higher reliability when the power output is above 350 kW.

[0566] In some embodiments, the electrolyte further includes an organic solvent, and the organic solvent includes a carbonate solvent.

[0567] Optionally, the carbonate solvent includes one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate. Further optionally, the carbonate solvent includes one or more of ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate.

[0568] Further optionally, the mass content of the carbonate-based solvent in the organic solvent is 10% to 70%, which can be selected as one of 30% to 50% or 10% to 30% or 30% to 70%.

[0569] Illustratively, the mass content of the carbonate-based solvent in the organic solvent is 10%, 20%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 40%, 45%, 48%, 50%, 55%, 60%, 65%, 70%, or a range composed of any two of the above values. The carbonate-based solvent with the above mass content can further improve the conductivity of the electrolyte at room temperature, and is conducive to the migration of lithium ions.

[0570] Illustratively, the carbonate-based solvent includes one or more of ethylene carbonate, dimethyl carbonate, and methyl ethyl carbonate, and the mass content of the carbonate-based solvent is 30% to 50%.

[0571] The addition of the carbonate-based solvent in the electrolyte can improve various performances of the battery subunit, for example, the charge-discharge efficiency, cycle performance, low-temperature performance, and high-voltage stability of the battery subunit, so that the battery discharge stability of the battery subunit can be improved when high-power output is required.

[0572] In some embodiments, the electrolyte includes an electrolyte salt, and the electrolyte salt includes lithium hexafluorophosphate, and the concentration of the lithium hexafluorophosphate is in a range of 0.5 mol / L-1.0 mol / L.

[0573] Illustratively, the concentration of the lithium hexafluorophosphate can be 0.5 mol / L, 0.6 mol / L, 0.7 mol / L, 0.8 mol / L, 0.9 mol / L, or a range composed of any two of the above values.

[0574] Illustratively, the proportion of the lithium hexafluorophosphate based on the total mass of the electrolyte can be, but is not limited to, 10%-25%.

[0575] By setting the electrolyte to include the lithium hexafluorophosphate with the above concentration, the battery subunit has a higher ionic conductivity, thereby improving the charging rate of the charging device 100, and also making the battery subunit have higher interface stability and higher thermal stability; the lithium hexafluorophosphate has a smaller influence on the severity of thermal runaway, so that the battery subunit has a suitable severity of thermal runaway, and the risk of thermal diffusion is lower, so that the charging device has higher reliability when the power output is above 350 kW.

[0576] In some embodiments, the electrolyte salt further includes a fluorine-containing sulfonimide salt, and the concentration of the fluorine-containing sulfonimide salt is in a range of 0.2 mol / L-0.5 mol / L.

[0577] The fluorine-containing sulfimide salt can include one or more of lithium bisfluorosulfimide LiFSI, lithium bis-trifluoromethanesulfonamide LiTFSI.

[0578] Optionally, the lithium salt includes lithium bisfluorosulfimide LiFSI and lithium hexafluorophosphate LiPF6, the molar concentration of lithium bisfluorosulfimide LiFSI is 0.2 mol / L to 0.5 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF6 is 0.5 mol / L to 1.0 mol / L.

[0579] For example, the molar concentration of lithium bisfluorosulfimide LiFSI is 0.4 mol / L to 0.5 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF6 is 0.7 mol / L. 66

[0580] For example, the molar concentration of lithium bisfluorosulfimide LiFSI is 0.5 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF6 is 0.5 mol / L.

[0581] For example, the molar concentration of lithium bisfluorosulfimide LiFSI is 0.2 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF6 is 0.8 mol / L.

[0582] Optionally, the ratio of the molar concentration of lithium bisfluorosulfimide LiFSI to the molar concentration of lithium hexafluorophosphate LiPF6 is 0.2 to 1.0, and optionally 0.2 to 0.5. For example, the ratio of the molar concentration of lithium bisfluorosulfimide LiFSI to the molar concentration of lithium hexafluorophosphate LiPF6 is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, or a range formed by any two of the above values.

[0583] In the embodiments of the present application, the types and contents of inorganic components / lithium salt concentrations in the electrolyte are the meanings known in the art, and can be detected by using the devices and methods known in the art, for example, the qualitative or quantitative analysis of the inorganic components / lithium salt concentrations in the electrolyte can be performed by ion chromatography according to the standard JY / T020-1996 “General Ion Chromatography Analysis Method”. In the embodiments of the present application, the freshly prepared electrolyte can be taken as a sample, the free electrolyte of a fresh battery can be taken as a sample, or the free electrolyte obtained from a battery that has been discharged (discharged to the lower limit cutoff voltage so that the charged state of the battery is about 0% SOC) by reverse disassembly can be taken as a sample, and the ion chromatography analysis method is used for detection.

[0584] ​In the embodiments of the present application, the types and contents of the organic components in the electrolyte are in the meanings known in the art, which can be detected by using the devices and methods known in the art, for example, the qualitative and quantitative analysis of the organic components in the electrolyte can be performed by gas chromatography according to GB / T 9722-2006 "Chemical Reagents-General Procedure for Gas Chromatography". In the embodiments of the present application, the freshly prepared electrolyte can be taken as the sample, the free electrolyte of the fresh battery can be taken as the sample, or the free electrolyte obtained from the battery which has been discharged (discharged to the lower limit cutoff voltage so that the charged state of the battery is about 0% SOC) and disassembled in reverse can be taken as the sample, and the ion chromatography analysis method is used for detection.

[0585] In the embodiments of the present application, after the quantitative and qualitative detection of each component in the electrolyte, each component is classified, the chain carboxylate solvents and the carbonate solvents (for example, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate) are taken as the constituent components of the organic solvent, and the mass content of each component is calculated based on 100% of the mass of the organic solvent.

[0586] The carbonate additives (for example, vinylene carbonate, fluoroethylene carbonate), the sulfur-containing additives and the lithium salt additives are taken as the additives of the electrolyte, and the mass content of each component is calculated based on 100% of the mass of the electrolyte.

[0587] Since the fluorosulfonylimide salt has the characteristics of low viscosity and high ionic conductivity, the electrolyte including the fluorosulfonylimide salt with the above-mentioned concentration is beneficial to improve the charging rate of the battery subunit and further improve the charging rate of the charging device.

[0588] In some embodiments, the organic solvent includes the chain carboxylate solvent, and the mass content A of the chain carboxylate solvent based on the total mass of the solvent satisfies: 5%≤A≤75%.

[0589] The chain carboxylate solvent includes the following compound:

[0590]

[0591] R1 includes at least one of a hydrogen atom, a C1-C5 alkyl group or a C1-C5 haloalkyl group, and R2 includes a C1-C5 alkyl group and / or a C1-C5 haloalkyl group.

[0592] The mass content of the chain carboxylate solvent relative to the mass of the organic solvent is greater than or equal to 5% and less than or equal to 75%, which can be greater than or equal to 10% and less than or equal to 75%, or 30% to 70%, or 50% to 70%. For example, the mass content of the chain carboxylate solvent is 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or a range defined by any two of the above values.

[0593] When the mass content of the chain carboxylate solvent is within the above range, the viscosity of the electrolyte system is relatively small, which is conducive to the migration of lithium ions.

[0594] The chain carboxylate solvent described above has a high conductivity, which is conducive to improving the rapid charging capability of the single cell.

[0595] Optionally, R1 includes a hydrogen atom, a halogen atom, a C1 to C3 alkyl group, or a C1 to C3 haloalkyl group. Further optionally, R1 includes a hydrogen atom, a halogen atom, a C1 to C2 alkyl group, or a C1 to C2 haloalkyl group.

[0596] Optionally, R2 includes a C1 to C3 alkyl group or a C1 to C3 haloalkyl group. Further optionally, R2 includes a C1 to C2 alkyl group or a C1 to C2 haloalkyl group.

[0597] In each of the above embodiments, the halogen atom includes one or more of a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, which can be a fluorine atom.

[0598] In each of the above embodiments, the haloalkyl group includes one or more of a fluoroalkyl group, a chloroalkyl group, a bromoalkyl group, and an iodoalkyl group, which can be a fluoroalkyl group.

[0599] For example, the chain carboxylate solvent includes one or more of a compound represented by Formula I-1 to a compound represented by Formula I-8,

[0600]

[0601] The technical solution, the solvent includes a carboxylate solvent, so that the electrolyte can have a higher ionic conductivity and a relatively low viscosity, which is conducive to further improving the rapid charging performance of the charging device, such as the fast charging performance and / or the super charging performance.

[0602] In some embodiments, the electrolyte has a conductivity of 13 mS / cm to 20 mS / cm, optionally 15 mS / cm to 20 mS / cm at room temperature. For example, the electrolyte has a conductivity of 13 mS / cm, 13.5 mS / cm, 14 mS / cm, 14.5 mS / cm, 15 mS / cm, 15.5 mS / cm, 16 mS / cm, 16.5 mS / cm, 17 mS / cm, 17.5 mS / cm, 18 mS / cm, 18.5 mS / cm, 19 mS / cm, 19.5 mS / cm, 20 mS / cm or a range defined by any two of the above values at room temperature.

[0603] When the electrolyte has a conductivity of 13 mS / cm to 20 mS / cm at room temperature, for example 25℃, the migration rate of lithium ions in the electrolyte is high, which can further reduce the internal resistance of the single battery, thereby reducing the heat generation and improving the fast charging performance of the single battery.

[0604] In embodiments of the present application, the conductivity of the electrolyte at room temperature, for example 25℃, is ionic conductivity, which can be detected by using devices and methods known in the art, for example, referring to industry standard HG-T 4067-2015 for testing.

[0605] In some embodiments, the electrolyte has a viscosity of 2.3 mPa·s to 3.5 mPa·s at room temperature. For example, the electrolyte has a viscosity of 2.3 mPa·s, 2.4 mPa·s, 2.5 mPa·s, 2.6 mPa·s, 2.7 mPa·s, 2.8 mPa·s, 2.9 mPa·s, 3.0 mPa·s, 3.1 mPa·s, 3.2 mPa·s, 3.3 mPa·s, 3.4 mPa·s, 3.5 mPa·s or a range defined by any two of the above values.

[0606] When the electrolyte has a viscosity of 2.3 mPa·s to 3.5 mPa·s at room temperature, for example 25℃, the migration rate of lithium ions in the electrolyte is high, which can further reduce the internal resistance of the single battery, thereby reducing the heat generation and improving the fast charging performance of the single battery.

[0607] In embodiments of the present application, the viscosity of the electrolyte is the meaning known in the art, which can be detected by using devices and methods known in the art, for example, according to GB / T 10247-2008 for testing.

[0608] In some embodiments, the electrolyte has a density of 1.05 g / mL to 1.35 g / mL at room temperature, for example 25℃. For example, the electrolyte has a density of 1.05 g / mL, 1.10 g / mL, 1.15 g / mL, 1.2 g / mL, 1.25 g / mL, 1.3 g / mL, 1.35 g / mL or a range defined by any two of the above values.

[0609] When the density of the electrolyte is in the above range, the migration rate of lithium ions in the electrolyte is high, which can further reduce the internal resistance of the single battery, thereby reducing the heat generation and improving the rapid charging performance of the single battery.

[0610] In the embodiments of the present application, the density of the electrolyte has the meaning known in the art and can be detected by using the devices and methods known in the art, for example, by referring to GB / T 2013-2010.

[0611] The electrolyte includes an organic solvent and an electrolyte salt. The types of the organic solvent and the electrolyte salt are not particularly limited and can be selected according to actual needs.

[0612] In some embodiments, the electrolyte further contains an additive, which can include a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive capable of improving certain performance of the battery, such as an additive for improving the overcharge performance of the battery, an additive for improving the high-temperature performance of the battery, an additive for improving the low-temperature power performance of the battery, and the like.

[0613] In some embodiments, the additive contains one or more of a carbonate additive, a sulfur-containing additive, and a lithium salt additive, and can optionally be at least two of them. The above additives can improve the interface film performance on the positive electrode side and / or the negative electrode side, which is beneficial to improve the rapid charging performance of the single battery and improve the cycle performance.

[0614] In some embodiments, the mass content of the additive in the electrolyte is 1% to 10%, which can be 2% to 8%, and further can be 3.5% to 8%. Exemplarily, the mass content of the additive in the electrolyte is 1%, 2%, 3%, 3.5%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range formed by any two of the above values.

[0615] The additive with the above mass content can effectively improve the interface film performance on the positive electrode side and / or the negative electrode side, which is beneficial to improve the rapid charging performance of the single battery and improve the cycle performance.

[0616] Exemplarily, the carbonate additive includes one or more of vinylene carbonate VC and fluoroethylene carbonate FEC.

[0617] Exemplarily, the sulfur-containing additive includes one or more of vinyl sulfide DTD, bis vinyl sulfide 2-DTD, butylene sulfite BS, 1,3-propane sulfonate PS, vinyl sulfite ES, and methyl methylene disulfonate MMDS.

[0618] Optionally, the lithium salt additive comprises one or more of lithium difluorophosphate LiPO2F2, lithium difluoro(oxalato)borate LiDFOB, lithium tetrafluoroborate LiBF4, lithium bis(oxalato)borate LiBOB.

[0619] Optionally, the mass content of vinylene carbonate VC in the electrolyte is 0.5% to 9%, or 2% to 6%.

[0620] Optionally, the mass content of fluoroethylene carbonate FEC in the electrolyte is 0.1% to 4%, or 0.5% to 3%.

[0621] Optionally, the mass content of vinylene carbonate VC in the electrolyte is 0.5% to 9%, and the mass content of fluoroethylene carbonate FEC in the electrolyte is 0.1% to 4%.

[0622] Further optionally, the mass content of vinylene carbonate VC in the electrolyte is 2% to 6%, and the mass content of fluoroethylene carbonate FEC in the electrolyte is 0.5% to 3%.

[0623] In some embodiments, the monomer cell satisfies 2.45 g / Ah ≤ d / A ≤ 3.5 g / Ah, or 2.45 g / Ah ≤ d / A ≤ 3.3 g / Ah, where d represents the mass of the electrolyte in the monomer cell, in g, and A represents the rated capacity of the monomer cell, in Ah. For example, d / A can be 3.5 g / Ah, 3.3 g / Ah, 3.2 g / Ah, 3.0 g / Ah, 2.8 g / Ah, 2.5 g / Ah, 2.45 g / Ah, or a range defined by any two of the above values.

[0624] d / A can reflect the liquid retention capacity of the electrolyte. When d / A is in the above range, the electrolyte can better infiltrate the positive and negative electrode sheets, and can improve the migration rate of lithium ions in the liquid phase, which is conducive to improving the rapid charging capacity of the monomer cell.

[0625] In the embodiments of the present application, d / A of the monomer cell can be understood as a liquid retention coefficient, which can be detected by using devices and methods known in the art. For example, GB / T 31486-2015 “Power Battery for Electric Vehicles: Electrical Performance Requirements and Test Methods” can be used as an example to illustrate the case where the upper limit voltage of the battery is 3.65 V and the discharge cutoff voltage of the battery is 2.0 V.

[0626] The monomer cell is charged to 3.65V at 0.33C at 25°C, then charged to 0.05C at constant voltage, and then discharged to 2.0V at 0.33C at constant current, to obtain the capacity A discharged as the denominator, the monomer cell is weighed as M0, then the positive electrode plate, the negative electrode plate, the separator and the electrolyte are disassembled, and the free electrolyte is in a bag, all the solid components are placed in a 60°C oven for more than 4 hours (including but not limited to the positive electrode plate, the negative electrode plate, the separator, and other mechanical parts of the disassembled monomer cell), then all the components of the monomer cell are weighed again M1, and the weight difference between M0 and M1 is taken as the numerator. The liquid retention coefficient is equal to the value obtained by dividing the weight difference d between M0 and M1 by the capacity A.

[0627] [the negative electrode plate]

[0628] In some embodiments, the resistance value of the negative electrode plate can be, but is not limited to, in the range of 0.001Ω-0.01Ω.

[0629] Optionally, the resistance of the negative electrode plate is 0.001Ω to 0.005Ω. Illustratively, the resistance of the negative electrode plate is 0.001Ω, 0.002Ω, 0.003Ω, 0.004Ω, 0.005Ω, 0.006Ω, 0.007Ω, 0.008Ω, 0.009Ω, 0.01Ω, or a range formed by any two of the above values.

[0630] In other examples, the resistance of the negative electrode plate can be in the range of 1mΩ-50mΩ.

[0631] In this way, when the resistance of the negative electrode plate is in the above range, it is beneficial to reduce the internal resistance of the monomer cell, can improve the conductivity of the battery subunit, and further improve the charging rate of the battery subunit, which is beneficial to improve the rapid charging performance of the battery device.

[0632] In the embodiments of the present application, the resistance of the negative electrode plate has the meaning known in the art and can be detected by using devices and methods known in the art, and the detection method is as described above for the resistance test method of the positive electrode plate.

[0633] In some embodiments, the negative active material includes a carbon-based material, and the carbon-based material includes at least one of natural graphite and artificial graphite. Alternatively, the carbon-based material can further include natural graphite. Specifically, the carbon-based material can include graphite particles, or the carbon-based material can include graphite particles and natural graphite.

[0634] Optionally, the carbon-based material is graphite particles. Based on the mass of the graphite particles, the mass percentage of the natural graphite can be greater than that of the artificial graphite.

[0635] The carbon-based material of at least one of natural graphite and artificial graphite is used as the negative active material layer, both of which have good electrical conductivity and high theoretical specific capacity. Natural graphite has high crystallinity and regular layered structure, which is beneficial to the rapid embedding and extraction of lithium ions, thereby improving the charging and discharging efficiency of the battery; artificial graphite can precisely adjust its microstructure and performance by controlling the production process, enhance the cycle stability of the single cell, and prolong the service life of the single cell, thereby prolonging the cycle life and charging stability of the charging device 100 in the scene of high-power charging.

[0636] In some embodiments, the volume average particle size Dv50 of the negative electrode film layer can be, but is not limited to, in the range of 8.2 μm-13.5 μm.

[0637] In the case of using a single-layer film layer for the negative electrode film layer, the negative active material in the negative electrode film layer includes a carbon-based material, and optionally also includes a silicon-based material. In the case of using a single-layer film layer, the volume average particle size Dv50 of the negative active material can be, but is not limited to, 8.2 μm to 13.5 μm. Exemplarily, the volume average particle size Dv50 of the negative active material is 8.2 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, 9.8 μm, 10 μm, 10.2 μm, 10.5 μm, 10.8 μm, 11 μm, 11.2 μm, 11.5 μm, 11.8 μm, 12 μm, 12.2 μm, 12.5 μm, 12.8 μm, 13 μm, 13.2 μm, 13.5 μm, or a range formed by any two of the above values. In other embodiments, the volume average particle size Dv50 of the negative electrode film layer can be between 8.2 μm and 18.5 μm, for example, can be 8.2 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, 9.8 μm, 10 μm, 10.2 μm, 10.5 μm, 10.8 μm, 11 μm, 11.2 μm, 11.5 μm, 11.8 μm, 12 μm, 12.2 μm, 12.5 μm, 12.8 μm, 13 μm, 13.2 μm, 13.5 μm, 14 μm, 15 μm, 16.2 μm, 18 μm, 18.5 μm, or a range formed by any two of the above values.

[0638] In the case of using at least two film layers for the negative electrode film layer, the negative active material in the negative electrode film layer includes a carbon-based material, and optionally also includes a silicon-based material, which can be located in one of the at least two film layers or in at least two of the at least two film layers. The negative electrode film layer can include two film layers, three film layers, four film layers, or even more film layers.

[0639] The volume average particle size Dv50 of the negative electrode film layer is in a range of 8.2 μm-13.5 μm, which can balance the specific surface area and the compaction density. A smaller particle size can provide a larger specific surface area, increase the reaction sites of lithium ions, and improve the charge-discharge rate performance of the single battery cell; and a proper particle size can have a higher compaction density, reduce the voids between active materials, and improve the energy density of the single battery cell, so that the single battery cell achieves a good balance between the rate performance and the energy density to meet the charging requirements of the charging device 100 at different charging rates.

[0640] In some embodiments, the negative electrode film layer includes a first negative electrode active material layer and a second negative electrode active material layer arranged in a stack, the first negative electrode active material layer is located on a side close to the negative electrode current collector, the volume average particle size Dv50 of the negative electrode active material in the first negative electrode active material layer is 9.5 μm-18.5 μm, and the volume average particle size Dv50 of the negative electrode active material in the second negative electrode active material layer is 7.8 μm-14.3 μm.

[0641] When the volume average particle size Dv50 of the negative electrode active material in the first negative electrode active material layer and the volume average particle size Dv50 of the negative electrode active material in the second negative electrode active material layer are in the above range, on the one hand, the solid-phase transmission path of lithium ions can be shortened, and the rapid charging performance can be improved, and on the other hand, the material is not easy to agglomerate during the preparation process, and the stability of the material can be improved. The negative electrode active material in the second negative electrode active material layer and the negative electrode active material in the first negative electrode active material layer in the above volume average particle size range cooperate, which is conducive to constructing a gradient pore difference between the second negative electrode active material layer and the first negative electrode active material layer, reducing the tortuosity of lithium ion transmission, and improving the rapid charging performance of the battery cell.

[0642] In some embodiments, the negative electrode film layer includes a first negative electrode film layer and a second negative electrode film layer, the first negative electrode film layer is arranged on the surface of the negative electrode current collector, the carbon-based material in the first negative electrode film layer includes graphite particles, the second negative electrode film layer is connected to a side of the first negative electrode film layer away from the negative electrode current collector, the carbon-based material in the second negative electrode film layer includes graphite particles, and the graphite particles in the first negative electrode film layer and the graphite particles in the second negative electrode film layer can be the same or different.

[0643] The interface of the first negative electrode film layer and the second negative electrode film layer can be regular or irregular, and is optionally irregular.

[0644] Optionally, the carbon-based material in the first negative electrode film layer further includes natural graphite.

[0645] The negative electrode film layer includes at least two film layers, and the layered coating is beneficial to improve the rapid charging performance of the single battery cell. In particular, when the first negative electrode film layer and the second negative electrode film layer are different, the pore difference of the negative electrode film layer can be constructed, the tortuosity of lithium ion transmission is reduced, and the rapid charging performance of the single battery cell is improved.

[0646] Optionally, the volume average particle size Dv50 of the negative electrode active material in the first negative electrode film layer is greater than or equal to the volume average particle size Dv50 of the negative electrode active material in the second negative electrode film layer. Further optionally, the volume average particle size Dv50 of the negative electrode active material in the first negative electrode film layer is greater than the volume average particle size Dv50 of the negative electrode active material in the second negative electrode film layer, which is beneficial to improve the compaction density of the negative electrode film layer. When the negative electrode active material includes graphite particles, the volume average particle size Dv50 of the graphite particles in the first negative electrode film layer is greater than or equal to the volume average particle size Dv50 of the graphite particles in the second negative electrode film layer.

[0647] The particle size difference in the first negative electrode film layer and the second negative electrode film layer can improve the rapid charging performance of the single battery cell. Specifically, during the rapid charging process, the overpotential of the second negative electrode film layer is usually high, and the bottleneck of the rapid charging is mainly in the second negative electrode film layer. In the embodiments of the present application, the particle size in the second negative electrode film layer is relatively small, which can shorten the solid-phase transmission path of lithium ions, improve the rapid charging performance, and improve the problem of lithium extraction on the surface of the negative electrode sheet.

[0648] Optionally, the negative electrode active material in the first negative electrode film layer is in a particle form, and the volume average particle size Dv50 thereof is 9.5 μm to 18.5 μm, which can be 9.5 μm to 14.6 μm. Exemplarily, the volume average particle size of the negative electrode active material in the first negative electrode film layer is 9.5 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, 14.6 μm, 15 μm, 15.5 μm, 16 μm, 16.5 μm, 17 μm, 17.5 μm, 18 μm, 18.5 μm, or a range formed by any two of the above values. When the first negative electrode film layer includes graphite particles, the volume average particle size Dv50 of the graphite particles in the first negative electrode film layer is 9.5 μm to 18.5 μm, which can be 9.5 μm to 14.6 μm.

[0649] When the volume average particle size Dv50 of the negative electrode active material in the first negative electrode film layer is in the above range, on the one hand, the solid-phase transmission path of lithium ions can be shortened, and the rapid charging performance can be improved. On the other hand, the material is not easy to agglomerate during the preparation process, and the stability of the material can be improved.

[0650] Optionally, the volume average particle size Dv50 of the negative active material in the second negative electrode film layer is 7.8 μm to 14.3 μm, or 7.8 μm to 11.3 μm. For example, the volume average particle size Dv50 of the negative active material in the second negative electrode film layer is 7.8 μm, 8.0 μm, 8.2 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, 9.8 μm, 10 μm, 10.2 μm, 10.5 μm, 10.8 μm, 11 μm, 11.3 μm, 11.2 μm, 11.5 μm, 11.8 μm, 12 μm, 12.2 μm, 12.5 μm, 12.8 μm, 13 μm, 13.2 μm, 13.5 μm, 13.8 μm, 14 μm, 14.1 μm, 14.3 μm, or a range defined by any two of the above values. When the second negative electrode film layer comprises graphite particles, the volume average particle size Dv50 of the graphite particles in the second negative electrode film layer is 7.8 μm to 14.3 μm, or 7.8 μm to 11.3 μm.

[0651] When the volume average particle size Dv50 of the negative active material in the second negative electrode film layer is within the above range, on the one hand, the solid-phase transmission path of lithium ions can be shortened, and the rapid charging performance can be improved. On the other hand, the material is less likely to agglomerate during preparation, and the stability of the material can be improved. On the other hand, the negative active material in the second negative electrode film layer and the negative active material in the first negative electrode film layer cooperate to facilitate the construction of a gradient pore difference between the second negative electrode film layer and the first negative electrode film layer, reduce the tortuosity of lithium ion transmission, and improve the rapid charging performance of the single battery cell.

[0652] In the embodiments of the present application, the volume average particle size Dv50 of the negative active material has the meaning known in the art, and can be detected by using the devices and methods known in the art. The detection method is as described above in the volume average particle size Dv50 test method of the positive active material.

[0653] Optionally, the tap density of the carbon-based material in the first negative electrode film layer is less than or equal to the tap density of the carbon-based material in the second negative electrode film layer. The tap density can reflect the filling density of the active material in the film layer. When the tap density of the carbon-based material in the second negative electrode film layer is greater than the tap density of the carbon-based material in the first negative electrode film layer, the second negative electrode film layer is more densely packed, so that the energy density of the single battery cell is improved, and the first negative electrode film layer is relatively less densely packed, and the pores are more abundant, which can improve the rapid charging performance of the single battery cell. When the negative active material comprises graphite particles, the tap density of the graphite particles in the first negative electrode film layer is less than or equal to the tap density of the graphite particles in the second negative electrode film layer.

[0654] Optionally, the tap density of the carbon-based material in the first negative electrode film layer is 0.82 g / cm 3to 1.21g / cm 3 , for example 0.82 g / cm 3 , 0.85g / cm 3 , 0.88g / cm 3 , 0.90g / cm 3 , 0.92g / cm 3 , 0.95g / cm 3 , 0.98g / cm 3 , 1.00g / cm 3 , 1.05g / cm 3 、1.08g / cm 3 , 1.10g / cm 3 , 1.12g / cm 3 , 1.15g / cm 3 , 1.18g / cm 3 , 1.20g / cm 3 , 1.21g / cm 3 When the tap density of the carbon-based material in the first negative electrode film layer is within an appropriate range, the fast charging performance of the single cell can be improved.

[0655] Optionally, the tap density of the carbon-based material in the second negative electrode film layer is 0.90 g / cm 3 Up to 1.25g / cm 3 , for example 0.90g / cm 3 , 0.92g / cm 3 , 0.95g / cm 3 , 0.98g / cm 3 , 1.00g / cm 3 , 1.05g / cm 3 、1.08g / cm 3 , 1.10g / cm 3 , 1.12g / cm 3 , 1.15g / cm 3 , 1.18g / cm 3 , 1.20g / cm 3 , 1.21g / cm 3 , 1.22g / cm 3 , 1.23g / cm 3 , 1.24g / cm 3 ³ , 1.25g / cm 3 When the tap density of the carbon-based material in the second negative electrode film layer is within an appropriate range, the energy density of the single cell can be increased.

[0656] In the embodiments of the present application, the tap density of the material is a meaning known in the art, which can be measured by using instruments and methods known in the art. For example, GB / T 5162-2006 can be referred to, and a powder tap density tester can be used for measurement. The testing instrument can be a Dandong Bitai BT-301.

[0657] Optionally, the ratio of the thickness of the second negative electrode film layer to the thickness of the first negative electrode film layer is 3:7 to 7:3, or 4:6 to 6:4. For example, the ratio of the thickness of the second negative electrode film layer to the thickness of the first negative electrode film layer is 3:7, 4:6, 5:5, 6:4, 7:3, or a range formed by any two of the above values. By adjusting the thickness ratio of the first negative electrode film layer and the second negative electrode film layer, the gradient pore difference between the upper and lower layers can be further increased, the tortuosity of lithium ion transmission can be reduced, and the rapid charging capacity of the single battery cell can be improved.

[0658] In some embodiments, the tap density of the negative electrode film layer of the single battery cell at 100% state of charge is 1.15 g / cm 3 to 1.36 g / cm 3 .

[0659] Optionally, the tap density of the negative electrode film layer of the single battery cell at 100% state of charge is 1.25 g / cm 3 to 1.36 g / cm 3 . For example, the tap density of the negative electrode film layer of the single battery cell at 100% state of charge is 1.15 g / cm 3 , 1.18 g / cm 3 , 1.20 g / cm 3 , 1.22 g / cm 3 , 1.25 g / cm 3 , 1.28 g / cm 3 , 1.3 g / cm 3 , 1.32 g / cm 3 , 1.35 g / cm 3 , 1.36 g / cm 3 , or a range formed by any two of the above values.

[0660] In the embodiments of the present application, the tap density of the negative electrode film layer of the single battery cell at 100% state of charge is a meaning known in the art, which can be detected by using devices and methods known in the art, and the detection method is the same as the tap density test method of the positive electrode film layer described above.

[0661] When the tap density of the negative electrode film layer is in the above range, the energy density of the battery cell can be improved, and since the negative electrode active material in the negative electrode film layer is accumulated more closely, the contact resistance between particles is smaller, which can further reduce the resistance of the electrode sheet, thereby reducing the heat generation.

[0662] In some embodiments, the powder compaction density of the negative active material under a pressure of 20000 N is 1.5 g / cm 3 to 1.85 g / cm 3 , optionally 1.55 g / cm 3 to 1.65 g / cm 3 . For example, the powder compaction density of the negative active material under a pressure of 20000 N is 1.5 g / cm 3 , 1.55 g / cm 3 , 1.6 g / cm 3 , 1.65 g / cm 3 , 1.7 g / cm 3 , 1.75 g / cm 3 , 1.8 g / cm 3³ , 1.85 g / cm 3 , or a range defined by any two of the above values.

[0663] When the powder compaction density of the negative active material under a pressure of 20000 N is within the above range, the energy density of the single battery cell can be improved, and the negative active material in the negative film layer can be more closely packed, the contact resistance between particles is smaller, which can further reduce the resistance of the electrode sheet, thereby reducing the heat generation.

[0664] In the embodiments of the present application, the powder compaction density of the material is the meaning known in the art, which can be detected by the methods and devices known in the art according to the test standard GB / T24533-2009. For example, a certain amount of negative active material is taken as a sample, added into a mold with a bottom area of 1.327 cm 2² of a UTM7305 electronic pressure testing machine, pressurized to 2000 kg (equivalent to 20000 N), keep pressure for 30 s, then release pressure, keep for 10 s, then record and calculate the powder compaction density of the negative active material under the action of 20000 N force.

[0665] In some embodiments, the charge gram capacity of the negative active material at a 0.1C rate is 350 mAh / g to 480 mAh / g. For example, the charge gram capacity of the negative active material at a 0.1C rate is 350 mAh / g, 355 mAh / g, 360 mAh / g, 365 mAh / g, 370 mAh / g, 375 mAh / g, 380 mAh / g, 385 mAh / g, 390 mAh / g, 395 mAh / g, 400 mAh / g, 410 mAh / g, 420 mAh / g, 430 mAh / g, 440 mAh / g, 450 mAh / g, 460 mAh / g, 470 mAh / g, 480 mAh / g, or a range defined by any two of the above values.

[0666] When the charged gram capacity of the negative active material at the 0.1C rate is in the above range, the energy density of the single battery cell is relatively high.

[0667] In the embodiments of the present application, the charged gram capacity of the negative active material at the 0.1C rate is in the meaning known in the art, which can be detected by using the devices and methods known in the art, and the detection method is as follows: the charged gram capacity of the positive active material at the 0.1C rate is tested.

[0668] In some embodiments, the negative active material layer comprises a carbon-based material, which has high cycle stability and can improve the cycle performance of the single battery cell. Optionally, the mass fraction of the carbon-based material in the negative active material can be greater than or equal to 80% and less than or equal to 100%.

[0669] The positive active material of the present application is mainly a lithium-containing phosphate system with an olivine structure, and the negative active material is mainly a carbon-based material system. When the two are used together, the cycle performance of the single battery cell is excellent.

[0670] Optionally, the carbon-based material comprises graphite particles, and the graphitization degree of the graphite particles is 92.0% to 94.5%. For example, the graphitization degree of the graphite particles is 92.0%, 92.5%, 93%, 93.5%, 94%, 94.5% or a range formed by any two of the above values.

[0671] When the graphitization degree of the graphite particles is in the above range, the conductive performance of the graphite particles is excellent, which can reduce the heat generation of the negative electrode sheet, reduce the heat generation of the single battery cell, and improve the rapid charging performance of the single battery cell.

[0672] In some embodiments, the graphite particles comprise artificial graphite and a carbon coating layer, the artificial graphite comprises secondary particles, the secondary particles comprise a plurality of primary particles, and the carbon coating layer is coated on the surface of the artificial graphite. The carbon in the carbon coating layer is mainly amorphous carbon, which refers to a transition state carbon material with a very low degree of graphitization and crystallization, and an approximate amorphous state (or a structure with no fixed shape and periodicity). In the present application, amorphous carbon refers to the product after carbonization treatment of an organic carbon source.

[0673] The artificial graphite comprises secondary particles, the migration path of lithium ions in the artificial graphite is more, and the migration path in the primary particles is shorter, which can improve the migration rate of lithium ions, the carbon coating layer has more end faces and defects, so that the number of sites capable of deintercalating lithium ions increases, and the conductivity of the carbon coating layer is excellent, which can reduce the internal resistance of the negative electrode sheet and the heat generation of the single battery cell.

[0674] Optionally, the mass content of the carbon coating layer is 2% to 5% based on the mass of the graphite particles. Illustratively, the mass content of the carbon coating layer is 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or a range between any two of the foregoing values.

[0675] When the mass content of the carbon coating layer is within the foregoing range, the internal resistance of the negative electrode sheet can be further reduced, and the heat generation of the single battery can be reduced.

[0676] In the embodiments of the present application, the graphite particles can be prepared by methods known in the art, for example, the preparation method includes: providing artificial graphite and an organic carbon source, mixing the two, and then forming a carbon coating layer on at least part of the surface of the artificial graphite particles after carbonization treatment.

[0677] Optionally, the organic carbon source includes one or more of coal tar pitch, petroleum pitch, phenolic resin, and coconut shell. Further optionally, the organic carbon source includes petroleum pitch. Optionally, the softening point of the coal tar pitch and petroleum pitch is below 250°C.

[0678] Optionally, the carbonization treatment temperature is 700°C to 1800°C. Optionally, the carbonization treatment temperature is 1000°C to 1300°C. When the carbonization treatment temperature is within the appropriate range, the organic carbon source can be carbonized, and a coating layer containing amorphous carbon can be formed on at least part of the surface of the artificial graphite.

[0679] Optionally, the carbonization treatment time is 1h to 6h.

[0680] In some embodiments, the negative electrode active material can further include a silicon-based material. The introduction of the silicon-based material can improve the capacity of the negative electrode active material and increase the energy density of the single battery.

[0681] Optionally, the mass content of silicon in the silicon-based material is 0.3% to 10.0%, and optionally 1% to 6%, based on the mass of the negative electrode active material. Illustratively, the mass content of silicon in the silicon-based material is 0.3%, 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, or a range between any two of the foregoing values.

[0682] When the mass content of silicon in the silicon-based material is within the foregoing range, the capacity of the negative electrode active material can be improved, and the energy density of the single battery can be improved.

[0683] Optionally, the silicon-based material can include at least one of elemental silicon, silicon oxide, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy material.

[0684] In some embodiments, the negative active material can include at least one of tin-based material and lithium titanate in addition to the above-mentioned carbon-based material and optional silicon-based material. The tin-based material can include at least one of elemental tin, tin oxide, and tin alloy material.

[0685] The qualitative and quantitative detection of each substance or element in the present application can be performed by using suitable devices and methods known to those skilled in the art, and the relevant detection methods can refer to domestic and foreign detection standards, domestic and foreign enterprise standards, etc., and those skilled in the art can also adaptively change certain detection steps / instrument parameters from the perspective of detection accuracy to obtain more accurate detection results. One detection method can be used for qualitative or quantitative determination, or several detection methods can be used jointly for qualitative or quantitative determination.

[0686] For example, the negative electrode sheet or the negative active material can be subjected to X-ray powder diffraction test and qualitative analysis by JIS / K0131-1996 X-ray Diffraction Analysis Method General.

[0687] Artificial graphite and natural graphite can be distinguished by SEM cross-sectional SEM images taken by scanning electron microscope SEM, there are gaps between flaky structures in the SEM cross-sectional image of natural graphite, the SEM cross-sectional image of artificial graphite is dense and has no obvious gap, or distinguished by XRD spectrum obtained by X-ray diffraction method, there are obvious 2H phase and 3R phase in the XRD spectrum of natural graphite, and there is only 2H phase in the XRD spectrum of artificial graphite.

[0688] In some embodiments, the powder resistivity of the negative active material is 0.005 Ω•cm to 0.043 Ω•cm, and optionally 0.04 Ω•cm. Illustratively, the powder resistivity of the negative active material can be 0.043 Ω•cm, 0.04 Ω•cm, 0.035 Ω•cm, 0.03 Ω•cm, 0.025 Ω•cm, 0.02 Ω•cm, 0.015 Ω•cm, 0.01 Ω•cm, 0.005 Ω•cm, or a range formed by any two of the above values.

[0689] The relatively low powder resistivity of the negative active material makes the resistance of the negative electrode sheet relatively low, and the single battery cell generates less heat.

[0690] In the embodiments of the present application, the powder resistivity of the negative active material has the meaning known in the art, and can be detected by using devices and methods known in the art, and the detection method is as described above for the powder resistivity test method of the positive active material.

[0691] In some embodiments, after a single cell undergoes 10 full charge cycles in the Beginning of Life (BOL) test, the thickness of the first negative electrode film layer is between 15μm and 65μm, such as 15μm, 17μm, 18μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 57μm, 58μm, 60μm, 61μm, 62μm, 63μm, 64μm, 65μm, or a range consisting of any two of these values. When the thickness of the first negative electrode film layer is within the above range, the gradient porosity difference between the first negative electrode film layer and the second negative electrode film layer can be increased, thereby reducing the tortuosity of lithium ion transmission and improving the fast charging capability of the single cell.

[0692] In some embodiments, after a single cell undergoes 10 full charge cycles in the Beginning of Life (BOL) test, the thickness of the second negative electrode film layer is between 15μm and 65μm, such as 15μm, 17μm, 18μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 57μm, 58μm, 60μm, 61μm, 62μm, 63μm, 64μm, 65μm, or a range consisting of any two of these values. When the thickness of the second negative electrode film layer is within the above range, the gradient porosity difference between the first negative electrode film layer and the second negative electrode film layer can be increased, thereby reducing the tortuosity of lithium ion transport and improving the fast charging capability of the single cell.

[0693] In the embodiment of the present application, for example, the battery charging upper limit voltage is 3.65V and the battery discharging cut-off voltage is 2.0V.

[0694] The BOL full charge test steps are as follows: at 25°C, charge the battery to 3.65V at a charge rate of 0.33C, then charge it to 0.05C at a constant voltage of 3.65V, let it stand for 10 minutes, then discharge it to 2.0V at a discharge rate of 0.33C, let it stand for 10 minutes. The above charge and discharge is one cycle, and the cycle is 10 times. Then charge it to 3.65V at a charge rate of 0.33C, then charge it to 0.05C at a constant voltage of 3.65V. In the BOL fully charged state, the negative electrode sheet is disassembled, and a cross-section in the thickness direction of the middle area of ​​the negative electrode sheet is observed using a tomographic scanning electron microscope. The first negative electrode film layer and the second negative electrode film layer are distinguished according to the interface between the two areas, and the thickness of the two areas is measured respectively. For example, the thickness of 10 positions of the first negative electrode film layer is measured respectively, and the average value thereof is calculated as the average thickness of the first negative electrode film layer; the thickness of 10 positions of the second negative electrode film layer is measured, and the average value thereof is calculated as the average thickness of the second negative electrode film layer.

[0695] In some embodiments, after a single cell undergoes an end-of-life (EOL) full charge test, the thickness of the first negative electrode film layer is 15 μm to 70 μm, such as 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 35 μm, 40 μm, 43 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 66 μm, 67 μm, 68 μm, 69 μm, or 70 μm, or a range consisting of any two of these values. When the thickness of the first negative electrode film layer is within the above range, the gradient porosity difference between the first negative electrode film layer and the second negative electrode film layer can be increased, thereby reducing the tortuosity of lithium ion transmission and improving the fast charging capability of the single cell.

[0696] In some embodiments, after a single cell undergoes an end-of-life (EOL) full charge test, the thickness of the second negative electrode film layer is 15 μm to 70 μm, such as 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 35 μm, 40 μm, 43 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 66 μm, 67 μm, 68 μm, 69 μm, or 70 μm, or a range consisting of any two of these values. When the thickness of the second negative electrode film layer is within the above range, the gradient porosity difference between the first negative electrode film layer and the second negative electrode film layer can be increased, thereby reducing the tortuosity of lithium ion transmission and improving the fast charging capability of the single cell.

[0697] In the embodiment of the present application, for example, a battery charging upper limit voltage of 3.65V and a battery discharging cut-off voltage of 2.0V are taken as an example for description.

[0698] The EOL full charge test procedure is as follows: at 60°C, charge at a charge rate of 0.33C of the nominal capacity of the battery to 3.65V, then charge at a constant voltage of 3.65V to 0.05C, stand for 10 minutes, then discharge at a discharge rate of 0.33C to 2.0V, stand for 10 minutes, the above one charge and discharge is one cycle, until the battery capacity decays to 80% of the nominal capacity to stop the test. Then at 25°C, charge to 3.65V at a constant current of 0.33C, and charge to 3.65V at a constant voltage of 0.05C, which is the EOL full charge state, in the EOL full charge state, disassemble the negative electrode sheet, use a scanning electron microscope to observe the thickness direction of the cross section of the middle region of the negative electrode sheet, distinguish the two regions according to the interface of the first negative electrode film layer and the second negative electrode film layer, and measure the thickness of the two regions respectively, for example, measure the thickness of 10 positions of the first negative electrode film layer respectively, calculate the average value as the average thickness of the first negative electrode film layer, and measure the thickness of 10 positions of the second negative electrode film layer, calculate the average value as the average thickness of the second negative electrode film layer.

[0699] In some embodiments, in the case of a single-layer film layer (different from the above-mentioned double-layer film layer) for the negative electrode film layer, the negative electrode film layer further comprises a lithium-containing binder. Optionally, the mass content of the lithium-containing binder in the negative electrode film layer is 0.1% to 1%. Illustratively, the mass content of the lithium-containing binder in the negative electrode film layer is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or a range composed of any two of the above-mentioned values. The lithium element in the lithium-containing binder can exist in the form of ions, which can increase the number of free-moving lithium ions in the negative electrode film layer, shorten the distance of lithium ion diffusion to the surface of the negative electrode film layer, increase the de-intercalation rate of lithium ions, and improve the rapid charging performance of the single battery. Optionally, the negative electrode film layer can further comprise a negative electrode binder, for example, the negative electrode binder comprises at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (for example, polyacrylic acid PAA, polymethylacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS).

[0700] Optionally, the mass content of lithium element in the lithium-containing binder is 3% to 10%. Illustratively, the mass content of lithium element in the lithium-containing binder is 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range composed of any two of the above-mentioned values. The mass content of lithium element is calculated based on the mass of the lithium-containing binder. When the mass content of lithium element is in the above-mentioned range, the number of free-moving lithium ions in the negative electrode film layer can be relatively large, which can further shorten the distance of lithium ion diffusion to the surface of the negative electrode film layer, increase the de-intercalation rate of lithium ions, and improve the rapid charging performance of the single battery.

[0701] Exemplarily, the lithium-containing binder comprises lithium acrylate-acrylonitrile-acrylamide-hydroxyethyl acrylate copolymer, the lithium acrylate-acrylonitrile-acrylamide-hydroxyethyl acrylate copolymer is derived from lithium acrylate monomers, acrylonitrile monomers, acrylamide monomers and hydroxyethyl acrylate monomers, and the molar ratio of the lithium acrylate monomers, the acrylonitrile monomers, the acrylamide monomers and the hydroxyethyl acrylate monomers is 30% to 50%: 15% to 45%: 5% to 20%: 20% to 35%. For example, the molar ratio of the lithium acrylate monomers, the acrylonitrile monomers, the acrylamide monomers and the hydroxyethyl acrylate monomers is 35%: 30%: 15%: 20%, or 40%: 20%: 10%: 30%, or 45%: 15%: 20%: 20%, etc.

[0702] The lithium-containing binder of the above material can provide a certain amount of lithium ions for the negative electrode film layer, improve the rapid charging performance of the single battery, and is not prone to swelling during charging and discharging, so that the structure is stable, and the cycle performance of the negative electrode film layer during rapid charging and discharging is improved.

[0703] In some other embodiments, in the case of adopting at least two film layers for the negative electrode film layer, the negative electrode film layer further comprises a lithium-containing binder.

[0704] Optionally, the first negative electrode film layer further comprises a first lithium-containing binder, and the second negative electrode film layer further comprises a second lithium-containing binder, and the mass content of the first lithium-containing binder relative to the mass of the first negative electrode film layer is less than or equal to the mass content of the second lithium-containing binder relative to the mass of the second negative electrode film layer. Further optionally, the mass content of the first lithium-containing binder relative to the mass of the first negative electrode film layer is less than the mass content of the second lithium-containing binder relative to the mass of the second negative electrode film layer.

[0705] The mass content of the second lithium-containing binder in the second negative electrode film layer is relatively high, and the second lithium-containing binder provides a relatively large amount of freely movable lithium ions for the second negative electrode film layer, which can further improve the rapid charging performance of the single battery.

[0706] Optionally, the mass content of the first lithium-containing binder relative to the mass of the first negative electrode film layer is 0.1% to 1%. Exemplarily, the mass content of the first lithium-containing binder relative to the mass of the first negative electrode film layer is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or a range formed by any two of the above values. The lithium element in the first lithium-containing binder can exist in the form of ions, which can increase the number of freely movable lithium ions in the negative electrode film layer, shorten the distance of lithium ion diffusion to the surface of the negative electrode film layer, improve the de-intercalation rate of lithium ions, and improve the rapid charging performance of the single battery.

[0707] Optionally, the mass content of lithium element in the first lithium-containing binder is 3% to 10%, which can be 3% to 8%. For example, the mass content of lithium element in the first lithium-containing binder is 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range formed by any two of the above values. When the mass content of lithium element is in the above range, the number of lithium ions that can freely move in the negative electrode film layer is relatively large, which can further shorten the distance of lithium ion diffusion to the surface of the negative electrode film layer, improve the deintercalation rate of lithium ions, and improve the rapid charging performance of the single battery.

[0708] For example, the first lithium-containing binder includes lithium acrylate-acrylonitrile-acrylamide-hydroxyethyl acrylate copolymer, which is derived from lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and hydroxyethyl acrylate monomer, and the molar ratio of lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and hydroxyethyl acrylate monomer is 30% to 50%: 15% to 45%: 5% to 20%: 20% to 35%. For example, the molar ratio of lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and hydroxyethyl acrylate monomer is 35%: 30%: 15%: 20%, or 40%: 20%: 10%: 30%, or 45%: 15%: 20%: 20%, etc.

[0709] The lithium-containing binder of the above material can provide a certain amount of lithium ions for the negative electrode film layer, improve the rapid charging performance of the single battery, and is not prone to swelling during charging and discharging, has a stable structure, and improves the cycle performance of the negative electrode film layer during rapid charging and discharging.

[0710] Optionally, the mass content of the second lithium-containing binder relative to the mass of the second negative electrode film layer is 0.1% to 1%. For example, the mass content of the second lithium-containing binder relative to the mass of the second negative electrode film layer is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or a range formed by any two of the above values. The lithium element in the second lithium-containing binder can exist in the form of ions, which can increase the number of lithium ions that can freely move in the negative electrode film layer, shorten the distance of lithium ion diffusion to the surface of the negative electrode film layer, improve the deintercalation rate of lithium ions, and improve the rapid charging performance of the single battery.

[0711] The first lithium-containing binder and the second lithium-containing binder can be made of the same material or different materials.

[0712] Optionally, the mass content of lithium element in the second lithium-containing binder is 3% to 10%, optionally 3% to 8%. Illustratively, the mass content of lithium element in the second lithium-containing binder is 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range formed by any two of the above values. When the mass content of lithium element is in the above range, the number of lithium ions that can freely move in the negative electrode film layer is relatively large, which can further shorten the distance of lithium ion diffusion to the surface of the negative electrode film layer, improve the deintercalation rate of lithium ions, and improve the rapid charging performance of the single battery cell.

[0713] Illustratively, the second lithium-containing binder includes lithium acrylate-acrylonitrile-acrylamide-hydroxyethyl acrylate copolymer, the lithium acrylate-acrylonitrile-acrylamide-hydroxyethyl acrylate copolymer is derived from lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and hydroxyethyl acrylate monomer, and the molar ratio of lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and hydroxyethyl acrylate monomer is 30% to 50%: 15% to 45%: 5% to 20%: 20% to 35%. For example, the molar ratio of lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and hydroxyethyl acrylate monomer is 35%:30%:15%:20%, or 40%, 20%, 10%, 30%, or 45%, 15%, 20%, 20%, etc.

[0714] The lithium-containing binder of the above material can provide a certain amount of lithium ions for the negative electrode film layer, improve the rapid charging performance of the single battery cell, and is not prone to swelling during charging and discharging, has a stable structure, and improves the cycle performance of the negative electrode film layer during rapid charging and discharging.

[0715] In some embodiments, the first negative electrode film layer further includes a negative electrode binder, and the second negative electrode film layer further includes a negative electrode binder. The negative electrode binder in the first negative electrode film layer and the negative electrode binder in the second negative electrode film layer each independently includes at least one of styrene butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (for example, polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS).

[0716] In some embodiments, the total content of the first lithium-containing binder and the negative electrode binder in the first negative electrode film layer is greater than the total content of the second lithium-containing binder and the negative electrode binder in the second negative electrode film layer, and the mass content of the first lithium-containing binder relative to the mass of the first negative electrode film layer is less than the mass content of the second lithium-containing binder relative to the mass of the second negative electrode film layer.

[0717] In some embodiments, the negative electrode film layer further optionally comprises a negative electrode conductive agent. The present application does not have a particular limitation on the type of the negative electrode conductive agent, and as an example, the negative electrode conductive agent can comprise at least one of super-p carbon, conductive graphite, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass content of the negative electrode conductive agent is ≤5% based on the total weight of the negative electrode film layer.

[0718] In some embodiments, the negative electrode film layer further optionally comprises a negative electrode binder. In some embodiments, the mass content of the negative electrode binder is ≤5% based on the total weight of the negative electrode film layer.

[0719] In some embodiments, the negative electrode film layer further optionally comprises other auxiliary agents. As an example, the other auxiliary agents can comprise thickening agents, dispersing agents, and the like, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, and the like. In some embodiments, the mass content of the other auxiliary agents is ≤2% based on the total weight of the negative electrode film layer.

[0720] In some embodiments, the negative electrode current collector can employ a metal foil or a composite current collector. As an example of the metal foil, at least one foil of copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy can be employed. The composite current collector can comprise ...

Claims

1. A charging device, characterized in that: The device comprises an energy storage device and a control device, wherein the charging device is configured to charge the battery device through the energy storage device, and the control device is configured to: Determining charging requirement information of the battery device, where the charging requirement information is used to indicate a required charging power of the battery device; determining discharge capacity information of the energy storage device; determining charging parameters of the charging device according to the discharge capacity information and the charging demand information; charging the battery device according to the charging parameters, wherein the charging power corresponding to the charging parameters is less than or equal to the required charging power; The charging demand information includes charging mode information, and when the discharge capacity information satisfies a first preset condition, charging the battery device includes: independently charging the battery device through the energy storage device; The discharge capability information includes the state of charge of the energy storage device, and the discharge capability information satisfies a first preset condition, including: the state of charge belongs to a first state of charge range, and the first state of charge range is greater than or equal to 50% SOC; The energy storage device includes one or more energy storage modules, each of which includes a plurality of energy storage units, each of which has a first positive power supply terminal and a first negative power supply terminal, and the one or more energy storage units are connected to a second positive power supply terminal and a second negative power supply terminal of the energy storage module via the first positive power supply terminal and the first negative power supply terminal, and the energy storage module is configured to provide a first direct current; The charging device further includes a charging module, the charging module being connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module, the charging module being configured to perform charging output based on the first direct current; The energy storage module further includes a selection unit, the selection unit being connected to one or more energy storage units and configured to select at least one energy storage unit from the one or more energy storage units and connect the energy storage unit to the second positive power supply terminal and the second negative power supply terminal to provide a first direct current; The charging module includes multiple eighth power conversion sub-units and a charging gun. The positive input end of each of the eighth power conversion sub-units is connected to one of the second positive power supply ends, the positive output end of each of the eighth power conversion sub-units is connected to the positive input end of the charging gun, and the negative input end of the charging gun is connected to the second negative power supply end. The multiple eighth power conversion sub-units are configured to convert the first direct current into a fourth direct current for charging output through the charging gun.

2. The charging device according to claim 1, characterized in that The charging power includes the discharging power of the energy storage device.

3. The charging device according to claim 1, wherein: The ratio of the rated energy to the rated power of the energy storage device is less than or equal to 1:3; and / or The ratio of the rated energy to the maximum discharge power of the energy storage device is less than or equal to 1:4; and / or The energy density of the energy storage device is greater than or equal to 380 watt-hours / liter.

4. The charging device according to claim 1, wherein: The charging requirement information includes charging mode information. When the charging mode information includes first charging mode information, the charging requirement power includes a first charging requirement power. When the charging mode information includes second charging mode information, the charging requirement power includes a second charging requirement power. The first required charging power is greater than the second required charging power.

5. The charging device according to claim 4, characterized in that When the charging mode information includes the first charging mode information, the discharge power of the energy storage device includes a first discharge power; when the charging mode information includes the second charging mode information, the discharge power of the energy storage device includes a second discharge power; Wherein, the first discharge power is greater than or equal to the second discharge power.

6. The charging device according to claim 4, characterized in that When the charging mode information includes the first charging mode information, the discharge rate of the energy storage device includes a first discharge rate; when the charging mode information includes the second charging mode information, the discharge rate of the energy storage device includes a second discharge rate; Wherein, the first discharge rate is greater than the second discharge rate.

7. The charging device according to claim 4, characterized in that When the charging mode information includes the first charging mode information, the charging power includes a first charging power; and when the charging mode information includes the second charging mode information, the charging power includes a second charging power. Wherein, the first charging power is greater than the second charging power; The charging parameter is determined according to the discharge capability information and the switched charging mode.

8. The charging device according to any one of claims 1 to 7, characterized in that: The charging device also includes a power conversion device, which is configured to charge the energy storage device through input power. The power conversion device includes a rated power, the charging demand power is greater than the rated power, the charging power is greater than the rated power, and / or the discharge power of the energy storage device is greater than the rated power.

9. The charging device according to claim 8, characterized in that When the discharge capacity information satisfies a first preset condition, the control device is further configured to: independently charging the battery device via the energy storage device; When the discharge capacity information satisfies a second preset condition, the control device is further configured to: charging the battery device through the energy storage device and the power conversion device; When the discharge capacity information satisfies a third preset condition, the control device is further configured to: The battery device is independently charged by the power conversion device.

10. The charging device according to any one of claims 1 to 7, characterized in that: The control device is specifically used for: Discharge capacity information of the energy storage device is determined according to the electrical parameters of the energy storage device, where the discharge capacity information indicates the maximum discharge power of the energy storage device.

11. The charging device according to any one of claims 1 to 7, characterized in that: The maximum charging output power of the charging module is greater than or equal to 350 kilowatts, and / or the rated charging output power of the charging module is greater than or equal to 290 kilowatts.

12. The charging device according to claim 11, characterized in that Also includes: An input module is adapted to provide charging energy to each of the energy storage units.

13. The charging device according to claim 12, characterized in that: The ratio of the maximum charging output power of the charging module to the maximum output power of the input module is greater than 1 and less than or equal to 15, and / or the ratio of the rated charging output power of the charging module to the rated output power of the input module is greater than 1 and less than or equal to 15.

14. The charging device according to claim 12, wherein: Each of the energy storage units includes a battery subunit, and a ratio between the rated output power of the input module and the rated energy of the battery subunit is greater than or equal to 1 / n1, where the value range of n1 is 1-4.

15. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, and the ratio between the rated energy of the battery subunit and the rated charging output power of the charging module is greater than or equal to 1 / (n2*n3), where the value range of n2 is 94%-99%, and the value range of n3 is 4-6.

16. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, the ratio between the rated energy of the battery subunit and the rated power of the battery subunit is less than or equal to 1 / 3, and / or the volume energy density of the battery subunit is greater than or equal to 380 watt-hours / liter.

17. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, the battery subunit includes a single cell, the single cell includes an electrolyte, the electrolyte includes an electrolyte salt, the electrolyte salt includes lithium hexafluorophosphate, and the concentration of the lithium hexafluorophosphate is in the range of 0.5 mol / L-1.0 mol / L.

18. The charging device according to claim 17, characterized in that The electrolyte further includes an organic solvent, and the organic solvent includes a carbonate solvent.

19. The charging device according to claim 17, wherein: The electrolyte salt further includes a fluorine-containing sulfonyl imide salt, and the concentration of the fluorine-containing sulfonyl imide salt is in the range of 0.2 mol / L to 0.5 mol / L.

20. The charging device according to claim 17, wherein: The electrolyte further includes an organic solvent, and the organic solvent includes a chain carboxylate solvent. Based on the total mass of the solvent, the mass content A of the chain carboxylate solvent satisfies: 5%≤A≤75%, Wherein, the chain carboxylate solvent includes a compound with the following structure: Wherein, R1 includes at least one of a hydrogen atom, a C1-C5 alkyl group or a C1-C5 haloalkyl group, and R2 includes a C1-C5 alkyl group and / or a C1-C5 haloalkyl group.

21. The charging device according to claim 20, characterized in that 40%≤A≤75%。 22. The charging device according to claim 11, wherein: Each of the energy storage units includes a battery subunit, each of the battery subunits includes a single battery cell, each of the single battery cell includes a negative electrode plate, each of the negative electrode plates includes a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, each of the negative electrode film layer includes a negative electrode active material, each of the negative electrode active materials includes a carbon-based material, and each of the carbon-based materials includes at least one of natural graphite and artificial graphite.

23. The charging device according to claim 22, characterized in that The volume average particle size Dv50 of the negative electrode film layer is in the range of 8.2μm-13.5μm; or, the negative electrode film layer includes a first negative electrode active material layer and a second negative electrode active material layer arranged in a stacked manner, the first negative electrode active material layer is located on the side close to the negative electrode current collector, the volume average particle size Dv50 of the negative electrode active material in the first negative electrode active material layer is 9.5μm-18.5μm, and the volume average particle size Dv50 of the negative electrode active material in the second negative electrode active material layer is 7.8μm-14.3μm.

24. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, the battery subunit includes a single battery cell, the single battery cell includes a negative electrode plate, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer located at least on one side of the negative electrode current collector, and the negative electrode film layer includes a negative electrode active material; The compaction density of the negative electrode film layer of the single cell is 1.15g / cm 3 -1.36g / cm 3 , and / or, the single-sided coating weight of the negative electrode film layer is 0.09g / 1540.25mm 2 -0.17g / 1540.25mm 2 .

25. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, the battery subunit includes a single battery cell, the single battery cell includes a positive electrode plate, the positive electrode plate includes a positive electrode current collector and a positive electrode film layer located at least on one side of the positive electrode current collector, and the positive electrode film layer includes a positive electrode active material; The compaction density of the positive electrode film layer of the single cell is 2.5g / cm when the cell is 100% charged. 3 -2.8g / cm 3 , and / or, the single-sided coating weight of the positive electrode film layer is 0.2g / 1540.25mm 2 -0.37g / 1540.25mm 2 .

26. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, the battery subunit includes a single battery cell, the single battery cell includes a positive electrode plate, the positive electrode plate includes a positive electrode collector and a positive electrode film layer located at least on one side of the positive electrode collector, and the thickness of the positive electrode collector is 10μm-15μm.

27. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, each of the battery subunits includes a single battery cell, each of the single battery cells includes an isolation membrane, and each isolation membrane includes a base membrane with a porous structure. The porosity of the base membrane is 20% to 70%.

28. The charging device according to claim 11, characterized in that Each of the energy storage units includes a battery subunit, the battery subunit includes a positive electrode plate, the positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on at least one side of the positive electrode current collector, the positive electrode film layer includes a positive electrode active material, and the positive electrode active material includes a lithium-containing phosphate; The lithium-containing phosphate includes phosphate particles and a coating layer, wherein the coating layer is coated on at least a portion of the surface of the phosphate particles, and the coating layer includes one or more elements selected from the group consisting of C, Fe, Ti, Zr, Hf, Ge, and Sn.

29. The charging device according to claim 28, characterized in that The coating layer includes a fast ion conductor, wherein the fast ion conductor includes a general formula of Li 3-d Fe 2-d M 2d (PO4)3 compound, M2 includes at least one element selected from Ti, Zr, Hf, Ge and Sn, 0≤d≤1.

30. The charging device according to claim 11, wherein: Each of the energy storage units includes a battery subunit, each of the battery subunits includes a positive electrode plate, each of the positive electrode plates includes a positive electrode current collector, a positive electrode conductive layer and a positive electrode film layer, the positive electrode film layer is provided on at least one side of the positive electrode current collector, the positive electrode conductive layer is located between the positive electrode current collector and the positive electrode film layer, and the thickness of the positive electrode conductive layer is in the range of 0.5 μm-2 μm; and / or Each of the energy storage units includes a battery subunit, which includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector, a negative electrode conductive layer and a negative electrode film layer. The negative electrode film layer is arranged on at least one side of the negative electrode current collector, and the negative electrode conductive layer is located between the negative electrode current collector and the negative electrode film layer. The thickness of the negative electrode conductive layer is in the range of 0.5μm-2μm.

31. The charging device according to claim 30, characterized in that The positive electrode conductive layer comprises a positive electrode conductive agent, and the mass content of the positive electrode conductive agent is in the range of 30%-50% based on the total mass of the positive electrode conductive layer; and / or The positive electrode conductive layer includes a positive electrode binder. Based on the total mass of the positive electrode conductive layer, the mass content of the positive electrode binder is in the range of 50%-70%.

32. The charging device according to claim 30, characterized in that The negative electrode conductive layer comprises a negative electrode conductive agent, and the mass content of the negative electrode conductive agent is in the range of 20%-40% based on the total mass of the negative electrode conductive layer; and / or The negative electrode conductive layer includes a negative electrode binder. Based on the total mass of the negative electrode conductive layer, the mass content of the negative electrode binder is in the range of 60% to 80%.

33. A charging pile, characterized in that: Comprising a charging device according to any one of claims 1-32.

34. A charging method, the charging method being implemented by the charging device according to any one of claims 1 to 32, characterized in that: Applied to a charging device, the charging device including an energy storage device, the charging device being configured to charge a battery device via the energy storage device, the charging method comprising: Determining charging requirement information of the battery device, where the charging requirement information is used to indicate a required charging power of the battery device; determining discharge capacity information of the energy storage device; determining charging parameters of the charging device according to the discharge capacity information and the charging demand information; The battery device is charged according to the charging parameters, and the charging power corresponding to the charging parameters is less than or equal to the required charging power.

35. The charging method according to claim 34, characterized in that: The charging power includes the discharging power of the energy storage device.

36. The charging method according to claim 34, wherein: The ratio of the rated energy to the rated power of the energy storage device is less than or equal to 1:3; and / or The ratio of the rated energy to the maximum discharge power of the energy storage device is less than or equal to 1:4; and / or The energy density of the energy storage device is greater than or equal to 380 watt-hours / liter.

37. The charging method according to claim 34, characterized in that: The charging requirement information includes charging mode information. When the charging mode information includes first charging mode information, the charging requirement power includes a first charging requirement power. When the charging mode information includes second charging mode information, the charging requirement power includes a second charging requirement power. The first required charging power is greater than the second required charging power.

38. The charging method according to claim 37, wherein: When the charging mode information includes the first charging mode information, the discharge power of the energy storage device includes a first discharge power; when the charging mode information includes the second charging mode information, the discharge power of the energy storage device includes a second discharge power; Wherein, the first discharge power is greater than or equal to the second discharge power.

39. The charging method according to claim 37, wherein: When the charging mode information includes the first charging mode information, the discharge rate of the energy storage device includes a first discharge rate; when the charging mode information includes the second charging mode information, the discharge rate of the energy storage device includes a second discharge rate; Wherein, the first discharge rate is greater than the second discharge rate.

40. The charging method according to claim 37, wherein: When the charging mode information includes the first charging mode information, the charging power includes a first charging power; and when the charging mode information includes the second charging mode information, the charging power includes a second charging power. The first charging power is greater than the second charging power.

41. The charging method according to claim 37, wherein: The determining charging requirement information of the battery device includes: The charging mode information input by a user is received, where the charging mode information is used to indicate a charging mode selected by the user for charging the battery device.

42. The charging method according to claim 41, characterized in that: The charging method further includes: determining whether the charging mode matches the charging device and / or whether the charging mode matches the battery device; When the charging mode does not match the charging device and / or the charging mode does not match the battery device, sending switching information, where the switching information is used to instruct to switch the charging mode; The determining the charging parameters of the charging device according to the discharge capability information and the charging requirement information includes: The charging parameter is determined according to the discharge capability information and the switched charging mode.

43. The charging method according to any one of claims 34 to 42, characterized in that: The charging demand information includes charging power information, and the charging power information includes one or more of the following information: charging time, charging power, target power of the battery device, and charging cost; The charging method further includes: When the charging operation matches the charging power information, charging of the battery device is stopped.

44. The charging method according to any one of claims 34 to 42, characterized in that: The charging device further includes a power conversion device, the power conversion device being configured to charge the energy storage device via input power, the power conversion device including a rated power; The required charging power is greater than the rated power, the charging power is greater than the rated power, and / or the discharge power of the energy storage device is greater than the rated power.

45. The charging method according to claim 44, characterized in that: The required charging power is greater than 3 times the rated power; and / or The charging power is greater than 3 times the rated power; and / or The discharge power of the energy storage device is greater than 3 times the rated power.

46. ​​The charging method according to claim 44, characterized in that: independently charging the battery device via the energy storage device; When the discharge capacity information satisfies a second preset condition, charging the battery device includes: charging the battery device through the energy storage device and the power conversion device; When the discharge capacity information satisfies a third preset condition, charging the battery device includes: The battery device is independently charged by the power conversion device.

47. The charging method according to claim 46, characterized in that: The discharge capability information satisfies a second preset condition, including: the state of charge belongs to a second state of charge range; and / or The discharge capability information satisfies a third preset condition, including: the state of charge belongs to a third state of charge range.

48. The charging method according to claim 46, characterized in that: The discharge capacity information includes the energy state of the energy storage device; The discharge capacity information satisfies a first preset condition, including: the energy state belongs to a first energy state range; and / or The discharge capacity information satisfies a second preset condition, including: the energy state belongs to a second energy state range; and / or The discharge capability information satisfies a third preset condition, including: the energy state belongs to a third energy state range.

49. The charging method according to claim 46, wherein: The discharge capacity information indicates the maximum discharge power of the energy storage device; The discharge capacity information satisfies a first preset condition, including: the maximum discharge power belongs to a first power range; and / or The discharge capability information satisfies a second preset condition, including: the maximum discharge power belongs to a second power range; and / or The discharge capability information satisfies a third preset condition, including: the maximum discharge power belongs to a third power range.

50. The charging method according to claim 34, wherein: The determining the discharge capacity information of the energy storage device includes: Discharge capacity information of the energy storage device is determined according to the electrical parameters of the energy storage device, where the discharge capacity information indicates the maximum discharge power of the energy storage device.

51. The charging method according to claim 50, characterized in that: When the electrical parameter satisfies a fourth preset condition, the maximum discharge power includes a first maximum discharge power; When the electrical parameter satisfies a fifth preset condition, the maximum discharge power includes a second maximum discharge power; When the electrical parameter satisfies a sixth preset condition, the maximum discharge power includes a third maximum discharge power; The maximum discharge powers are, from small to large, the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

52. The charging method according to claim 51, characterized in that: The electrical parameters include the state of charge of the energy storage device; The electrical parameter satisfies a fourth preset condition, including: the state of charge falls within a fourth state of charge range; and / or The electrical parameter satisfies a fifth preset condition, including: the state of charge belongs to a fifth state of charge range; and / or The electrical parameter satisfies a sixth preset condition, including: the state of charge belongs to a sixth state of charge range.

53. The charging method according to claim 51 or 52, characterized in that: The electrical parameters include the energy state of the energy storage device; The electrical parameter satisfies a fourth preset condition, including: the energy state belongs to a fourth energy state range; and / or The electrical parameter satisfies a fifth preset condition, including: the energy state belongs to a fifth energy state range; and / or The electrical parameter satisfies a sixth preset condition, including: the energy state belongs to a sixth state of charge range.

54. The charging method according to any one of claims 34 to 42, characterized in that: The charging power is greater than or equal to 100 kW, and / or the required charging power is greater than or equal to 300 kW.

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