Charging device, charging pile and charging method

Abstract

The invention 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, and the charging demand information is used for indicating 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 discharging capability information and the charging demand information; and charging the battery device according to the charging parameter, wherein the charging power corresponding to the charging parameter is less than or equal to the charging demand power. Therefore, on one hand, the charging requirement of the battery device can be met within the discharging capacity range of the charging device; and on the other hand, the purpose of charging the battery device by low-power input and high-power output is achieved without transforming the power grid.

Description

[0001] Cross - Reference to Related Applications This application claims priority from the following patent applications, the entire contents of which are incorporated herein by reference: PCT International Patent Application No. PCT / CN2024 / 093486, titled "Charging Method and Charging Device", filed on May 15, 2024; PCT International Patent Application No. PCT / CN2024 / 093513, titled "Charging Device, Charging Pile and Charging and Storage System", filed on May 15, 2024; PCT International Patent Application No. PCT / CN2024 / 102652, titled "Battery Cell, Battery and Electrical Device", filed on June 28, 2024. Technical Field

[0002] This application relates to the technical field of charging, and particularly relates to a charging device, a charging pile and a charging method. Background Art

[0003] With the development of the times, electric vehicles have great market prospects due to their high environmental protection, low noise, low usage cost and other advantages, and can effectively promote energy conservation and emission reduction, which is beneficial to the development and progress of society. The charging speed of electric vehicles affects the development and application of electric vehicles, and also affects the acceptance of the public for electric vehicles.

[0004] Therefore, how to improve the charging speed of electric vehicles is an urgent problem to be solved. Summary of the Invention

[0005] Embodiments of this application provide a charging device, a charging pile and a charging method, which can effectively improve the charging speed of a battery device at a relatively low cost.

[0006] In a first aspect, this application provides a charging device, including an energy storage device and a control device. The charging device is configured to charge a battery device through the energy storage device. The control device is used for: determining the charging demand information of the battery device, where the charging demand information is used to indicate the charging demand power of the battery device; determining the discharge capacity information of the energy storage device; determining the 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, where the charging power corresponding to the charging parameters is less than or equal to the charging demand power.

[0007] 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 indicating the charging demand power of the battery device and the discharge capacity information of the energy storage device, and the charging power corresponding to the determined charging parameters is less than or equal to the charging demand power. In this way, on the one hand, it can meet the charging demand of the battery device within the discharge capacity range of the charging device; on the other hand, it can achieve the purpose of charging the battery device with low-power input and high-power output without transforming the power grid. For example, there is no need to additionally configure an external transformer for the power grid or expand the transformer capacity, so as to improve the charging rate of the battery device at a relatively low construction cost.

[0008] In some embodiments, the charging power includes the discharge power of the energy storage device.

[0009] In the above technical solution, the charging power includes the discharge power of the energy storage device, that is, part or all of the charging power is derived from the discharge power of the energy storage device. That is to say, there are various ways for the charging device to charge the battery device. For example, the energy storage device can charge the battery device alone, or the energy storage device and other components can jointly charge the battery device. In this way, 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.

[0010] In some embodiments, 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 per liter.

[0011] In the above technical solution, 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, so as to save the floor area of the energy storage device and reduce 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 supercharging ability without transforming the power grid, effectively reducing the construction cost of the charging device.

[0012] In some embodiments, the charging demand information includes charging mode information. When the charging mode information includes the first charging mode information, the charging demand power includes the first charging demand power. When the charging mode information includes the second charging mode information, the charging demand power includes the second charging demand power; Among them, the first charging demand power is greater than the second charging demand power.

[0013] The above technical solution provides two charging modes, and the charging demand powers corresponding to the two charging modes are different. In this way, during 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.

[0014] In some embodiments, when the charging mode information includes the first charging mode information, the discharge power of the energy storage device includes the first discharge power, and when the charging mode information includes the second charging mode information, the discharge power of the energy storage device includes the second discharge power; Among them, the first discharge power is greater than or equal to the second discharge power.

[0015] The above technical solution provides two charging modes, and the discharge powers corresponding to the two charging modes are different. In this way, during 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.

[0016] In some embodiments, when the charging mode information includes the first charging mode information, the discharge rate of the energy storage device includes the first discharge rate, and when the charging mode information includes the second charging mode information, the discharge rate of the energy storage device includes the second discharge rate; Among them, the first discharge rate is greater than the second discharge rate.

[0017] The above technical solution provides two charging modes, and the discharge rates corresponding to the two charging modes are different. In this way, during 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.

[0018] In some embodiments, when the charging mode information includes the first charging mode information, the charging power includes the first charging power, and when the charging mode information includes the second charging mode information, the charging power includes the second charging power; Among them, the first charging power is greater than the second charging power; Determine the charging parameters according to the discharge capacity information and the switched charging mode.

[0019] The above technical solution provides two charging modes, and the charging powers corresponding to the two charging modes are different. In this way, during 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.

[0020] In some embodiments, the charging device further includes a power conversion device configured to charge the energy storage device with input power. The power conversion device has a rated power, and 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.

[0021] 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 large-power output, and thus greatly improves the charging rate of the battery device.

[0022] In some embodiments, when the discharge capacity information meets the first preset condition, the control device is further configured to: Charge the battery device independently through the energy storage device; When the discharge capacity information meets the second preset condition, the control device is further configured to: Charge the battery device through the energy storage device and the power conversion device; When the discharge capacity information meets the third preset condition, the control device is further configured to: Charge the battery device independently through the power conversion device.

[0023] In the above technical solution, when the discharge capacity information meets different preset conditions, the charging device charges the battery device through different devices. That is to say, 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.

[0024] In some embodiments, the control device is specifically configured to: Determine the discharge capacity information of the energy storage device according to the electrical parameters of the energy storage device, and the discharge capacity information indicates the maximum discharge power of the energy storage device.

[0025] In the above technical solution, the maximum discharge power of the energy storage device is determined according to the electrical parameters of the energy storage device, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage device, so that the determined charging parameters can conform to the actual situation of the energy storage device, and thus the charging device can complete the charging of the battery device in a reasonable and effective manner. In some embodiments, the energy storage device includes one or more energy storage modules, each energy storage module includes one or more energy storage units, each energy storage unit has a first positive power terminal and a first negative power terminal, and the one or more energy storage units are connected to the second positive power terminal and the second negative power terminal of the energy storage module through the first positive power terminal and the first negative power terminal. The energy storage module is configured to provide a first direct current; a charging module, the charging module is connected to the second positive power terminal and the second negative power terminal of the energy storage module, and 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.

[0026] In the technical solution of the embodiment of the present application, without the need to additionally configure a transformer or expand the transformer capacity, by configuring energy storage units inside the charging device, not only can the fast charging of the charging device be realized, such as fast charging / ultra-fast charging, but also the cost brought by adding a new transformer or expanding the transformer can be reduced.

[0027] In some embodiments, the charging device further includes: an input module, and the input module is suitable for providing charging energy for each energy storage unit.

[0028] 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 urban area with relatively tight power supply or a remote area sensitive to the cost of infrastructure construction, the charging device can realize the fast charging function by virtue of the cooperation of the input module and the energy storage module without relying on external complex power supply upgrades, enhancing the applicability and flexibility of the charging device in various scenarios.

[0029] 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.

[0030] Limiting the maximum output power and / or the rated power of the input module within the above range enables the charging device to be flexibly connected to a conventional power grid. The output power of most public power grids or commercial power interfaces has certain limitations. The power setting of this input module can smoothly obtain charging energy from the conventional power environment without modifying the existing power supply lines, improving the access feasibility of the charging device in various power consumption scenarios for the convenience of installing the charging device; and it can achieve high-power charging of the charging device under low-power input. During peak power consumption periods, when multiple electrical devices are running simultaneously, the energy storage module supplies power to multiple electrical devices, and the input module stably charges the energy storage unit at a lower power, which can effectively reduce the impact of the charging device on the power grid during the charging process and contribute to maintaining the stability of the power grid.

[0031] 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.

[0032] Thus, on the one hand, problems such as current shock and overheating generated 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 with low power, and the energy storage module then outputs to the charging module with controllable high power, realizing low-power input to the energy storage module and high-power output of the charging module. In addition, the energy storage module can flexibly adjust the output power according to its own stored power and the power consumption requirements of the electrical device, enabling the charging device to reasonably distribute electric energy, reduce unnecessary energy consumption, improve the cost performance of the charging device, and enable the charging device to operate stably when inputting with low power and outputting with high power.

[0033] 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 ranges from 1 to 4.

[0034] Thus, by stipulating that the rated output power of the input module should be greater than the rated energy of the battery subunit divided by the coefficient n1, when the input power of the input module 1 is relatively small, the rated energy of the battery subunit is small, making the input power match the rated energy of the battery subunit, and preventing the output module from charging the battery subunit too slowly and affecting the use of the energy storage unit; at the same time, stipulating that the rated energy of the battery subunit is small can also mean that the volume of the battery subunit is small, making the energy storage unit occupy a small area and convenient for installation; further realizing a small-volume energy storage unit, achieving low-power input and high-power output, and enhancing the user experience.

[0035] 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 ranges from 94% to 99%, and n3 ranges from 4 to 6.

[0036] Thus, while ensuring the charging performance, the reliability of the charging device is also taken into account. When the rated energy of the battery sub-unit matches the rated charging output power of the charging module, during the charging process, the battery sub-unit can stably supply energy to the charging module, reducing the instability or interruption of the charging power caused by insufficient energy supply. Taking n2 as 94% and n3 as 6 as an example, the relatively large denominator requires the battery sub-unit to have a relatively high rated energy to match the power of the charging module. This enables the charging device to work continuously and stably during long-term and high-power charging, reduces the probability of failures, lowers the maintenance cost, and improves the cost performance in terms of the service life of the charging device.

[0037] In some embodiments, each energy storage unit includes a battery sub-unit, and the ratio between the rated energy and the rated power of the battery sub-unit is less than or equal to 1 / 3, and / or, the volumetric energy density of the battery sub-unit is greater than or equal to 380 watt-hours per liter.

[0038] When the charging device outputs at high power (the maximum charging output power of the charging module is above 350 kW), matching the rated energy and the rated power of the battery sub-unit can reduce the grid fluctuations caused by the insufficient rated energy of the battery sub-unit due to high-power output and the need for grid power supply. This is beneficial to improving the reliability and stability of the charging device. Moreover, when outputting at high power, the charging device can work continuously and stably, reducing the probability of failures, lowering the maintenance cost, and improving the cost performance in terms of the service life of the charging device.

[0039] In some embodiments, each energy storage unit includes a battery sub-unit, the battery sub-unit includes single-cell batteries, the single-cell batteries include electrolytes, the electrolytes include electrolyte salts, the electrolyte salts include lithium hexafluorophosphate, and the concentration of lithium hexafluorophosphate is in the range of 0.5 mol / L - 1.0 mol / L.

[0040] By setting the electrolyte to include lithium hexafluorophosphate at the above concentration, the battery sub-unit has a high ionic conductivity, thereby improving the charging rate of the charging device. Moreover, it also enables the battery sub-unit to have high interfacial stability and high thermal stability; lithium hexafluorophosphate has a small impact on the severity of thermal runaway, making the battery sub-unit have an appropriate severity of thermal runaway and a low risk of thermal diffusion, so that the charging device has high reliability when outputting at a power above 350 kW.

[0041] In some embodiments, the electrolyte further includes organic solvents, and the organic solvents include carbonate solvents.

[0042] Adding carbonate solvents to the electrolyte can improve various performances of the battery sub-unit. For example, it can improve the charge-discharge efficiency, cycle performance, low-temperature performance, and high-voltage stability of the battery sub-unit.

[0043] In some embodiments, the electrolyte salt further includes a fluorosulfonylimide salt, and the concentration of the fluorosulfonylimide salt is in the range of 0.2 mol / L - 0.5 mol / L.

[0044] Since the fluorosulfonylimide salt has the characteristics of low viscosity and high ionic conductivity, the electrolyte including the fluorosulfonylimide salt at the above concentration is beneficial to improving the charging rate of the battery sub-unit, and further improving the charging rate of the charging device.

[0045] In some embodiments, the electrolyte further includes an organic solvent, and the organic solvent includes a chain carboxylic ester solvent. Based on the total mass of the solvent, the mass content A of the chain carboxylic ester solvent satisfies: 5% ≤ A ≤ 75%. Among them, the chain carboxylic ester solvent includes a compound with the following structure:

[0046] Among them, R 1 includes at least one of a hydrogen atom, a C1-C5 alkyl group or a C1-C5 haloalkyl group, and R 2 includes a C1-C5 alkyl group and / or a C1-C5 haloalkyl group.

[0047] In this technical solution, the solvent includes a carboxylic ester solvent. In this way, the electrolyte can have higher ionic conductivity and relatively lower viscosity, which is beneficial to further improving the fast charging performance of the charging device, such as fast charging performance and / or ultra-fast charging performance.

[0048] In some embodiments, 40% ≤ A ≤ 75%.

[0049] Setting A to be greater than or equal to 40% and less than or equal to 75% can better achieve the purpose of fast charging of the charging device.

[0050] In some embodiments, each energy storage unit includes a battery sub-unit, the battery sub-unit includes a single cell, and the single cell includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on at least one side of the negative electrode current collector. The negative electrode film layer includes a negative electrode active material, and the negative electrode active material includes a carbon-based material. The carbon-based material includes at least one of natural graphite and artificial graphite.

[0051] Using a carbon-based material with at least one of natural graphite and artificial graphite as the negative electrode active material, the two have good electrical conductivity and high theoretical specific capacity. Natural graphite has high crystallinity and regular layered structure, which is beneficial to the rapid insertion and extraction of lithium ions, thereby improving the charge and discharge efficiency of the battery; artificial graphite can precisely adjust its microstructure and performance by controlling the production process, enhancing the battery cycle stability and extending the battery service life.

[0052] In some embodiments, the volume-average particle size Dv50 of the negative electrode film layer ranges from 8.2 μm to 13.5 μm.

[0053] Thus, this particle size range can balance the specific surface area and the tap density. A smaller particle size can provide a larger specific surface area, increase the reaction sites for lithium ions, and improve the charge-discharge rate performance of the battery; while an appropriate particle size can ensure a higher tap density, reduce the voids between the active materials, and improve the energy density of the battery, so that the battery can achieve a better balance in rate performance and energy density.

[0054] 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 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 ranges from 9.5 μm to 18.5 μm, and the volume-average particle size Dv50 of the negative electrode active material in the second negative electrode active material layer ranges from 7.8 μm to 14.3 μm.

[0055] 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 within the above ranges, on the one hand, it can shorten the solid-phase transmission path of lithium ions and improve the fast-charging performance. On the other hand, the materials are not prone to agglomeration during the preparation process, which can improve the stability of the materials. The cooperation of 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 within the above volume-average particle size range is beneficial to constructing the 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 fast-charging performance of the battery cell.

[0056] In some embodiments, each energy storage unit includes a battery subunit. The battery subunit includes a single-cell battery. The single-cell battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and at least a negative electrode film layer on one side of the negative electrode current collector. The negative electrode film layer includes a negative electrode active material layer.

[0057] When the single-cell battery is in a 100% charged state, the tap density of the negative electrode film layer is 1.15 g / cm 3 -1.36 g / cm 3 , and / or, the single-sided coating weight of the negative electrode film layer is 0.09 g / 1540.25 mm 2 -0.17 g / 1540.25 mm 2 .

[0058] When the compaction density of the negative electrode film layer is within the above range, it is beneficial to improve the energy density of the battery cell. Moreover, since the negative electrode active materials in the negative electrode film layer are stacked relatively tightly and the contact resistance between particles is small, the resistance of the electrode sheet can be further reduced, thereby reducing heat generation. When the single-sided coating weight of the negative electrode film layer is within the above range, the heat generation per unit area of the negative electrode sheet will not be too large, and the energy density of the battery cell can be improved while taking it into account.

[0059] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a single cell, the single cell includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and at least a positive electrode film layer on one side of the positive current collector, and the positive electrode film layer includes a positive electrode active material layer; When the single cell is in a 100% charged state, the compaction density of the positive electrode film layer is 2.5 g / cm 3 -2.8 g / cm 3 。

[0060] When the compaction density of the positive electrode film layer is within the above range, it is beneficial to improve the energy density of the battery cell. Moreover, since the positive electrode active materials in the positive electrode film layer are stacked relatively tightly and the contact resistance between particles is small, the resistance of the electrode sheet can be further reduced, thereby reducing heat generation.

[0061] In some embodiments, the single-sided coating weight of the positive electrode film layer is 0.2 g / 1540.25 mm 2 -0.37 g / 1540.25 mm 2 。

[0062] When the single-sided coating weight of the positive electrode film layer is within the above range, the heat generation per unit area of the positive electrode sheet will not be too large, and the energy density of the battery cell can be improved while taking it into account.

[0063] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a single cell, the single cell includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and at least a positive electrode film layer on one side of the positive current collector, and the thickness of the positive current collector is 10 μm - 15 μm.

[0064] When the thickness of the positive current collector is within the above range, the current-carrying capacity of the positive current collector is relatively excellent, and the battery cell can have a relatively high energy density.

[0065] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a single cell, the single cell includes a separator, the separator includes a base film with a porous structure, and the porosity of the base film is 20% to 70%.

[0066] When the porosity of the base film is within the above range, the migration ability of lithium ions in the separator can be improved, the internal resistance of the battery cell can be reduced, and thus heat generation can be reduced.

[0067] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a positive electrode tab, the positive electrode tab 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; Wherein, the lithium-containing phosphate includes phosphate particles and a coating layer, the coating layer coats at least a part of the surface of the phosphate particles, and the coating layer includes one or more elements of C, Fe, Ti, Zr, Hf, Ge, and Sn.

[0068] Under this technical solution, the positive electrode coating layer has excellent ion and electron conduction capabilities, can improve the ionic conductivity and electron conductivity of the positive electrode active material, thereby effectively improving the charging rate of the battery subunit, improving the fast charging performance of the charging device, and being beneficial to enhancing the fast charging performance of the battery device.

[0069] In some embodiments, the coating layer includes a fast ion conductor, wherein the fast ion conductor includes a compound with the general formula Li 3-d Fe 2- d M 2d (PO 4 ) 3 , M 2 includes at least one element of Ti, Zr, Hf, Ge, and Sn, and 0 ≤ d ≤ 1.

[0070] Since the fast ion conductor has a high ionic conductivity, it is beneficial to the diffusion and transmission of lithium ions. Thus, it can further improve the charging rate of the battery subunit, improve the fast charging performance of the charging device, and be beneficial to enhancing the fast charging performance of the battery device.

[0071] In some embodiments, each energy storage unit includes a battery subunit, the battery subunit includes a positive electrode tab, the positive electrode tab 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.

[0072] In this way, the diffusion path of lithium ions can be shortened, thereby improving the rate performance of the battery subunit and being beneficial to enhancing the fast charging performance of the battery device.

[0073] In some embodiments, the positive electrode conductive layer includes a positive electrode conductive agent, and based on the total mass of the positive electrode conductive layer, the mass content of the positive electrode conductive agent is in the range of 30% - 50%.

[0074] In this technical solution, the mass content of the positive electrode conductive agent is set within the range of 30% - 50%, which can improve the electron transfer efficiency in the positive electrode sheet, thereby improving the rate performance of the battery subunit.

[0075] In some embodiments, 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 within the range of 50% - 70%.

[0076] In this technical solution, setting the mass content of the positive electrode binder within the range of 50% - 70% can reduce the possibility of cracking or peeling of the positive electrode sheet during cycling, thereby improving the cycle life of the battery subunit.

[0077] In some embodiments, each energy storage unit includes a battery subunit. The battery subunit includes a negative electrode sheet, which includes a negative electrode current collector, a negative electrode conductive layer, and a negative electrode film layer. The negative electrode film layer is disposed 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 within the range of 0.5 μm - 2 μm.

[0078] In this way, the diffusion path of lithium ions can be shortened, thereby improving the rate performance of the battery subunit and being beneficial to enhancing the fast charging performance of the battery device.

[0079] In some embodiments, the negative electrode conductive layer includes a negative electrode conductive agent. Based on the total mass of the negative electrode conductive layer, the mass content of the negative electrode conductive agent is within the range of 20% - 40%.

[0080] In this technical solution, setting the mass content of the negative electrode conductive agent within the range of 20% - 40% can improve the electron transfer efficiency in the negative electrode sheet, thereby improving the rate performance of the battery subunit and being beneficial to enhancing the fast charging performance of the battery device.

[0081] In some embodiments, the negative electrode conductive layer includes a negative electrode adhesive. Based on the total mass of the negative electrode conductive layer, the mass content of the negative electrode adhesive is within the range of 60% - 80%.

[0082] In this technical solution, setting the mass content of the negative electrode adhesive within the range of 60% - 80% can reduce the possibility of cracking or peeling of the negative electrode sheet during cycling, thereby improving the cycle life of the battery subunit and being beneficial to enhancing the cycle life of the battery device.

[0083] In a second aspect, the present application provides a charging pile, which includes the charging device of the first aspect.

[0084] Since the charging pile includes all the technical features of the charging device of the first aspect, the effects are the same as those described above and will not be elaborated here.

[0085] Third aspect, the present application provides a charging method applied to a charging device. The charging device includes an energy storage module, and the charging device is configured to charge a battery device through the energy storage module. The charging method includes: determining charging requirement information of the battery device, where the charging requirement information is used to indicate the charging requirement 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 requirement information; and charging the battery device according to the charging parameters, where the charging power corresponding to the charging parameters is less than or equal to the charging requirement power.

[0086] In an embodiment of the present application, the charging device determines charging parameters for charging the battery device according to the charging requirement information for indicating the charging requirement power of the battery device and the discharge capacity information of the energy storage module, and the charging power corresponding to the determined charging parameters is less than or equal to the charging requirement power. In this way, on the one hand, it can meet the charging requirements of the battery device within the discharge capacity range of the charging device; on the other hand, it can achieve the purpose of charging the battery device with small-power input and large-power output without transforming the power grid. For example, there is no need to additionally configure an external transformer for the power grid or expand the transformer, so as to improve the charging rate of the battery device with a relatively low construction cost.

[0087] In some embodiments, the charging power includes the discharge power of the energy storage module.

[0088] In the above technical solution, the charging power includes 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 to say, there are various ways for the charging device to charge the battery device. For example, the energy storage module can charge the battery device alone, or the energy storage module and other components can jointly charge the battery device. In this way, 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.

[0089] In some embodiments, 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 discharge 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.

[0090] 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, so as to save the floor area of the energy storage module and reduce 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 supercharging ability without transforming the power grid, effectively reducing the construction cost of the charging device.

[0091] In some embodiments, the charging demand information includes charging mode information. When the charging mode information includes first charging mode information, the charging demand power includes first charging demand power. When 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.

[0092] The above technical solution provides two charging modes, and the charging demand powers corresponding to the two charging modes are different. In this way, during 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.

[0093] In some embodiments, when the charging mode information includes the first charging mode information, the discharge power of the energy storage module includes first discharge power. When the charging mode information includes the second charging mode information, the discharge power of the energy storage module includes second discharge power; wherein, the first discharge power is greater than or equal to the second discharge power.

[0094] The above technical solution provides two charging modes, and the discharge powers corresponding to the two charging modes are different. In this way, during 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.

[0095] In some embodiments, when the charging mode information includes the first charging mode information, the discharge rate of the energy storage module includes first discharge rate. When the charging mode information includes the second charging mode information, the discharge rate of the energy storage module includes second discharge rate; wherein, the first discharge rate is greater than the second discharge rate.

[0096] The above technical solution provides two charging modes, and the discharge rates corresponding to the two charging modes are different. In this way, during 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.

[0097] In some embodiments, when the charging mode information includes the first charging mode information, the charging power includes first charging power. When the charging mode information includes the second charging mode information, the charging power includes second charging power; wherein, the first charging power is greater than the second charging power.

[0098] The above technical solution provides two charging modes, and the charging powers corresponding to the two charging modes are different. In this way, during 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.

[0099] In some embodiments, determining the charging requirement information of the battery device includes: receiving the charging mode information input by the user, where the charging mode information is used to indicate the charging mode selected by the user for charging the battery device.

[0100] The above technical solution obtains the charging mode information of the battery device by receiving the charging mode information input by the user. The charging mode information obtained in this way is associated with the relevant situation of the user at the current moment. For example, if the user does not have much time to wait for the charging device to charge the battery device at the current moment, the user selects a charging mode with a higher power, thereby effectively improving the user experience.

[0101] 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 where the charging mode does not match the charging device and / or the charging mode does not match the battery device, sending a switching information, where the switching information is used to indicate switching of the charging mode; determining the charging parameters of the charging device according to the discharge capacity information and the charging requirement information includes: determining the charging parameters according to the discharge capacity information and the switched charging mode.

[0102] 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 sends switching information for indicating switching of the charging mode in the case of non - matching, so that the finally determined charging mode can be more matched with the charging device and the battery device, thereby achieving a better effect of charging the battery device and improving the user experience.

[0103] In some embodiments, the charging requirement information includes charging power information, and the charging power information includes one or more of the following information: charging duration, charging power, the target power of the battery device, and charging cost; the charging method further includes: stopping charging the battery device in the case where the charging operation matches the charging power information.

[0104] In the above technical solution, the charging demand information includes one or more of charging duration, charging power, target power of the battery device, and charging cost, that is, the charging demand information may include multiple charging-related parameters. Thus, the accuracy rate of the charging parameters determined according to the charging demand information is relatively high, and further, the charging efficiency of the battery device based on the charging parameters is relatively high.

[0105] In some embodiments, the charging device further includes a power conversion device configured to charge the energy storage module with 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.

[0106] 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 large power output, and thus greatly improves the charging rate of the battery device.

[0107] In some embodiments, 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 discharge power of the energy storage module is greater than 3 times the rated power.

[0108] In the above technical solution, 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 discharge power is greater than 3 times the rated power, enabling the charging device to further obtain a large power output with a small power input, and thus greatly improving the charging rate of the battery device.

[0109] In some embodiments, when the discharge capacity information meets the first preset condition, charging the battery device includes: charging the battery device independently through the energy storage module; when the discharge capacity information meets the 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 the third preset condition, charging the battery device includes: charging the battery device independently through the power conversion device.

[0110] In the above technical solution, when the discharge capacity information meets different preset conditions, the charging device charges the battery device through different devices. That is to say, 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.

[0111] In some embodiments, the discharge capacity information includes the state of charge of the energy storage module; the discharge capacity information satisfying a first preset condition includes: the state of charge belonging to a first state-of-charge range; and / or the discharge capacity information satisfying a second preset condition includes: the state of charge belonging to a second state-of-charge range; and / or the discharge capacity information satisfying a third preset condition includes: the state of charge belonging to a third state-of-charge range.

[0112] In the above technical solution, the component for charging the battery device in the charging device is determined according to the state of charge of the energy storage module. Thus, the determined power supply source conforms to the actual situation of the energy storage module, enabling the charging device to charge the battery device in a reasonable and effective manner.

[0113] In some embodiments, the discharge capacity information includes the energy state of the energy storage module; the discharge capacity information satisfying a first preset condition includes: the energy state belonging to a first energy state range; and / or the discharge capacity information satisfying a second preset condition includes: the energy state belonging to a second energy state range; and / or the discharge capacity information satisfying a third preset condition includes: the energy state belonging to a third energy state range.

[0114] In the above technical solution, the component for charging the battery device in the charging device is determined according to the energy state of the energy storage module. Thus, the determined power supply source conforms to the actual situation of the energy storage module, enabling the charging device to charge the battery device in a reasonable and effective manner.

[0115] In some embodiments, the discharge capacity information indicates the maximum discharge power of the energy storage module; the discharge capacity information satisfying a first preset condition includes: the maximum discharge power belonging to a first power range; and / or the discharge capacity information satisfying a second preset condition includes: the maximum discharge power belonging to a second power range; and / or the discharge capacity information satisfying a third preset condition includes: the maximum discharge power belonging to a third power range.

[0116] In the above technical solution, the component for charging the battery device in the charging device is determined according to the maximum discharge power of the energy storage module. Thus, the determined power supply source conforms to the actual situation of the energy storage module, enabling the charging device to charge the battery device in a reasonable and effective manner.

[0117] In some embodiments, determining the discharge capacity information of the energy storage module includes: determining the discharge capacity information of the energy storage module according to the electrical parameters of the energy storage module, and the discharge capacity information indicates the maximum discharge power of the energy storage module.

[0118] In the above technical solution, the maximum discharge power of the energy storage module is determined according to the electrical parameters of the energy storage module, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage module, so that the determined charging parameters can conform to the actual situation of the energy storage module, and thus the charging device can charge the battery device in a reasonable and effective manner.

[0119] In some embodiments, when the electrical parameters meet the fourth preset condition, the maximum discharge power includes a first maximum discharge power; when the electrical parameters meet the fifth preset condition, the maximum discharge power includes a second maximum discharge power; when the electrical parameters meet the sixth preset condition, the maximum discharge power includes a third maximum discharge power; wherein, the maximum discharge powers from small to large are: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0120] In some embodiments, the electrical parameters include the state of charge of the energy storage module; that the electrical parameters meet the fourth preset condition includes: the state of charge belongs to the fourth state-of-charge range; and / or that the electrical parameters meet the fifth preset condition includes: the state of charge belongs to the fifth state-of-charge range; and / or that the electrical parameters meet the sixth preset condition includes: the state of charge belongs to the sixth state-of-charge range.

[0121] In the above technical solution, the maximum discharge power of the energy storage module is determined according to the state of charge of the energy storage module, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage module, so that the determined charging parameters can conform to the current state of the energy storage module, and thus the charging device can charge the battery device in a reasonable and effective manner.

[0122] In some embodiments, the electrical parameters include the energy state of the energy storage module; that the electrical parameters meet the fourth preset condition includes: the energy state belongs to the fourth energy state range; and / or that the electrical parameters meet the fifth preset condition includes: the energy state belongs to the fifth energy state range; and / or that the electrical parameters meet the sixth preset condition includes: the energy state belongs to the sixth state-of-charge range.

[0123] In the above technical solution, the maximum discharge power of the energy storage module is determined according to the energy state of the energy storage module, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage module, so that the determined charging parameters can conform to the current state of the energy storage module, and thus the charging device can charge the battery device in a reasonable and effective manner.

[0124] 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.

[0125] In the above technical solution, 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, further realizing the purpose of charging the battery device with low-power input and high-power output, and thus greatly improving the charging rate of the battery device.

[0126] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it 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 understandable, the following specific embodiments of the present application are specifically exemplified. Brief Description of the Drawings

[0127] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 A schematic diagram of an application scenario of an embodiment of the present application is shown.

[0128] Figure 2 A schematic flowchart of a charging method of an embodiment of the present application is shown.

[0129] Figure 3 A schematic diagram of a charging of a battery device by a storage module alone in an embodiment of the present application is shown.

[0130] Figure 4 A schematic diagram of a charging of a battery device by a storage module and a power conversion device together in an embodiment of the present application is shown.

[0131] Figure 5 A schematic diagram of a charging of a battery device by a power conversion device alone in an embodiment of the present application is shown.

[0132] Figure 6 A schematic block diagram of a charging device of an embodiment of the present application is shown.

[0133] Figure 7 A schematic block diagram of another charging device of an embodiment of the present application is shown.

[0134] Figure 8 A schematic structural diagram of a charging device with energy storage units connected in series according to an embodiment of the present application.

[0135] Figure 9Schematic diagram of a charging device with an input module according to an embodiment of the present application.

[0136] Figure 10 Schematic diagram of a charging device with energy storage units connected in parallel according to an embodiment of the present application.

[0137] Figure 11a Schematic diagram of a charging device with an energy storage unit including a battery subunit according to an embodiment of the present application.

[0138] Figure 11b Schematic diagram of a charging device with an energy storage unit including a battery subunit and a first power conversion subunit according to an embodiment of the present application.

[0139] Figure 11c Schematic diagram of a charging device with an energy storage unit including a battery subunit and a first switch subunit according to an embodiment of the present application.

[0140] Figure 11d Schematic diagram of a charging device with an energy storage unit including a battery subunit, a first power conversion subunit, and a first switch subunit according to an embodiment of the present application.

[0141] Figure 12a Schematic diagram of a charging device with an input module including an input interface according to an embodiment of the present application.

[0142] Figure 12b Schematic diagram of a charging device with an input module including a second power conversion subunit according to an embodiment of the present application.

[0143] Figure 13a Schematic diagram of a charging device with non - common - negative charging guns according to an embodiment of the present application.

[0144] Figure 13b Schematic diagram of a charging device with common - negative charging guns according to an embodiment of the present application.

[0145] Figure 14 Schematic diagram of a charging device with a selection unit according to an embodiment of the present application.

[0146] Figure 15 For Figure 14 Schematic diagram of the shown charging device with one second positive power supply terminal.

[0147] Figure 16a For Figure 15 Schematic diagram of the shown charging device with one second positive power supply terminal and non - common - negative charging guns.

[0148] Figure 16b For Figure 15Schematic diagram of a charging device with a second positive power supply terminal and a common negative for the charging gun.

[0149] Figure 17 For Figure 14 Schematic diagram of a charging device with multiple second positive power supply terminals.

[0150] Figure 18a For Figure 17 Schematic diagram of a charging device with multiple second positive power supply terminals and a non - common negative for the charging gun.

[0151] Figure 18b For Figure 17 Schematic diagram of a charging device with multiple second positive power supply terminals and a common negative for the charging gun.

[0152] Figure 19a For Figure 14 Schematic diagram of a charging device with a selection unit and an input module including a ninth power conversion sub - unit.

[0153] Figure 19b For Figure 14 Schematic diagram of a charging device with a selection unit and an input module including multiple tenth power conversion sub - units.

[0154] Figure 20 Schematic diagram of a charging device with a wireless communication module according to an embodiment of the present application.

[0155] Figure 21 Schematic diagram of a charging device with series - connected energy storage units, each energy storage unit including a bidirectional DCDC sub - unit and a non - common negative for the charging gun according to an embodiment of the present application.

[0156] Figure 22 Schematic diagram of a charging device with series - connected energy storage units, each energy storage unit including a bidirectional DCDC sub - unit and a common negative for the charging gun according to an embodiment of the present application.

[0157] Figure 23 Schematic diagram of a charging device with parallel - connected energy storage units, each energy storage unit including a bidirectional DCDC sub - unit and a non - common negative for the charging gun according to an embodiment of the present application.

[0158] Figure 24 Schematic diagram of a charging device with parallel - connected energy storage units, each energy storage unit including a bidirectional DCDC sub - unit and a common negative for the charging gun according to an embodiment of the present application.

[0159] Figure 25 Schematic diagram of a charging device with series - connected energy storage units, some energy storage units including a bidirectional DCDC sub - unit and a non - common negative for the charging gun according to an embodiment of the present application.

[0160] Figure 26 Schematic diagram of the structure of a charging device in which energy storage units in a series connection in an embodiment of the present application, some of the energy storage units include bidirectional DCDC sub-units and the charging guns share a common negative terminal.

[0161] Figure 27 Schematic diagram of the structure of a charging device in which energy storage units in a parallel connection in an embodiment of the present application, each energy storage unit includes a first switch sub-unit and the charging guns do not share a common negative terminal.

[0162] Figure 28 Schematic diagram of the structure of a charging device in which an energy storage unit and a bidirectional ACDC sub-unit in an embodiment of the present application form a three-phase power and the charging guns do not share a common negative terminal.

[0163] Figure 29 Schematic diagram of the structure of a charging device in which an energy storage unit and a bidirectional ACDC sub-unit in an embodiment of the present application form a three-phase power and the charging guns share a common negative terminal.

[0164] Figure 30 Schematic diagram of the structure of a single cell provided in some embodiments of the present application.

[0165] Figure 31 Explosion diagram of a single cell provided in some embodiments of the present application.

[0166] Figure 32 Schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0167] Figure 33 Schematic diagram of the structure of a battery pack provided in some embodiments of the present application.

[0168] Figure 34 Schematic diagram of an electrical device provided in some embodiments of the present application.

[0169] Figure 35 Schematic diagram of the structure of a charging pile in an embodiment of the present application.

[0170] Figure 36 Schematic diagram of the structure of a charging and energy storage system in an embodiment of the present application.

[0171] Figure 37 Schematic diagram of the structure of a charging and energy storage system in which multiple charging devices share a common DC bus in an embodiment of the present application.

[0172] Figure 38 Schematic diagram of the structure of a charging and energy storage system in which multiple charging devices share a common DC bus in another embodiment of the present application.

[0173] Figure 39Schematic diagram of a charging and storage system with multiple charging devices sharing an AC bus according to an embodiment of the present application.

[0174] The reference numerals are explained as follows: 100, charging device; 1010, energy storage device; 110, energy storage module; 120, charging module; 121, third power conversion sub-unit; 122, charging gun; 123, fourth power conversion sub-unit; 124, fifth power conversion sub-unit; 125, sixth power conversion sub-unit; 130, input module; 140, wireless communication module; 111, selection unit; 210, first external power source; 220, second external power source; 131, second power conversion sub-unit; 132, ninth power conversion sub-unit; 140, bidirectional DC / DC converter module; 151 / 152, insulation detection module; 160, electricity 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; 1, electrical equipment; 2, battery pack; 3, controller; 4, motor; 5, box body; 5a, first box body part; 5b, second box body part; 5c, accommodation space; 6, battery module; 7, single cell; 10, electrode assembly; 11, first tab; 13, second tab; 12, main body part; 20, outer shell; 21, housing; 22, end cover; 31, first electrode terminal; 32, second electrode terminal; 400, charging method; 500, electrical system. Detailed implementation manners Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0175] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0176] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0177] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0178] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0179] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0180] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0181] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0182] With the development of the times, electric vehicles have great market prospects due to their high environmental protection, low noise, low usage cost and other advantages, and can effectively promote energy conservation and emission reduction, which is beneficial to the development and progress of society. The charging speed of electric vehicles affects the development and application of electric vehicles and also affects the acceptance of the public towards electric vehicles.

[0183] Under normal circumstances, if you want to increase the charging speed of electric vehicles, it is necessary to configure an external transformer for the charging pile or expand the transformer capacity. In this case, more costs will be increased, which is not conducive to the popularization of the charging pile, and will further affect the user's charging experience, resulting in greater limitations on the development and application of electric vehicles.

[0184] In view of this, the embodiments of the present application provide a charging method that can effectively increase the charging speed of the battery device at a relatively low cost.

[0185] Figure 1 Fig. shows a schematic diagram of an application scenario of an embodiment of the present application. Figure 1 The illustrated electrical system 500 may include lightning protection devices SPD1 - SPD4, switching 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, switching 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 ammeter 160, and a charging module 120. The charging module is, for example, a charging gun, and the charging gun can be configured to be connected to a battery device, for example, to a power battery device in a vehicle, so as to Figure 1 charge the power battery device through the illustrated electrical system 500.

[0186] Among them, the low - voltage power supply module 180 can be an electrically isolated AC / DC converter, and the low - voltage power supply module 180 is used to supply power to components such as an energy management system (EMS), a CCU, and a battery management system (BMS).

[0187] The AC / DC converter 190 can be a bidirectional AC / DC converter. At this time, exemplarily, the power grid can not only supply power to the battery device connected to the charging module 120 through the bidirectional AC / DC converter, but also the battery device can supply power to the power grid through the bidirectional AC / DC converter.

[0188] Figure 1In the application scenario shown, the electrical system 500 can obtain alternating current from the power grid, convert it into direct current via the AC / DC converter 190, thereby charging the energy storage device 1010, and can also supply the converted direct current to the charging module 120 to charge the battery. The power grid is, for example, a system capable of supplying power, including the mains power, etc.

[0189] 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.

[0190] When the electrical system 500 is operating normally, the switching devices QF1 - QF5 are in the closed state, and the low - voltage power supply module 180 is operating normally.

[0191] It should be noted that Figure 1 the electrical system in Figure 1 is an example of the application scenario of the embodiments of the present disclosure. The addition or subtraction of components of the electrical system in

[0192] Figure 2 does not constitute a limitation on the embodiments of the present disclosure. Those skilled in the art can add and / or subtract devices in the electrical system according to needs.

[0193] The charging method 400 may include at least some of the following content.

[0194] S210: Determine the charging requirement information of the battery device, where the charging requirement information is used to indicate the charging requirement power of the battery device.

[0195] S220: Determine the discharge capacity information of the energy storage device.

[0196] S230: Determine the charging parameters of the charging device according to the discharge capacity information and the charging requirement information.

[0197] S240: Charge the battery device according to the charging parameters, where the charging power corresponding to the charging parameters is less than or equal to the charging requirement power.

[0198] In an embodiment of the present application, the charging device determines charging parameters for charging the battery device according to charging demand information for indicating the charging demand power of the battery device and discharge capacity information of the energy storage device, and the charging power corresponding to the determined charging parameters is less than or equal to the charging demand power. In this way, on the one hand, it can meet the charging demand of the battery device within the discharge capacity range of the charging device; on the other hand, it can achieve the purpose of charging the battery device with low-power input and high-power output without transforming the power grid. For example, there is no need to additionally configure an external transformer for the power grid or expand the transformer capacity, so as to improve the charging rate of the battery device with a relatively low construction cost.

[0199] 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 other energy storage devices different from the aforementioned energy storage device, and the state of charge (SOC) of the other energy storage device is relatively small.

[0200] 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 discharge 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 watt-hours per liter.

[0201] 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.

[0202] For example, the ratio of the rated energy to the maximum discharge 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.

[0203] For example, the energy density of the energy storage device can be greater than or equal to 400 watt-hours per liter, 450 watt-hours per liter, 500 watt-hours per liter, 550 watt-hours per liter, 600 watt-hours per liter or 700 watt-hours per liter, etc.

[0204] Optionally, 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.

[0205] 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 a numerical ratio.

[0206] In some embodiments, the energy storage device includes one or more energy storage modules. When 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 connection. The energy storage module is, for example, an electrical box.

[0207] In some embodiments, the energy storage module includes one or more battery subunits. When the energy storage module includes multiple battery units, the multiple battery subunits can be connected in series, parallel, or in a combined series-parallel configuration. The battery subunit is, for example, a single cell.

[0208] 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.

[0209] Similarly, the ratio of the rated energy to the rated power of the battery subunit 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 subunit can also be less than or equal to 1:4, and / or the energy density of the battery subunit can be greater than or equal to 380 watt-hours per liter.

[0210] As an example, the energy storage device includes 2 - 6 electrical boxes, each electrical box includes 10 - 100 single cells, and each electrical box can store 80 to 150 kilowatt-hours of electricity.

[0211] In the above technical solution, 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, so that the floor area of the energy storage device can be saved, and the size of the charging device can be reduced. On the other hand, the maximum discharge power of the energy storage device is large, so that the charging device can provide supercharging ability without modifying the power grid, effectively reducing the construction cost of the charging device.

[0212] 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.

[0213] 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.

[0214] In this way, the purpose of charging the battery device with small power input and large power output is further realized, and thus the charging rate of the battery device is improved to a large extent.

[0215] In some embodiments, the charging demand information may include charging mode information. When the charging mode information includes the first charging mode information, the charging demand power includes the first charging demand power; when the charging mode information includes the second charging mode information, the charging demand power includes the second charging demand power. Among them, the first charging demand power is greater than the second charging demand power.

[0216] The first charging mode information may be used to indicate the ultra-fast charging mode, and the second charging mode information may be used to indicate the fast charging mode.

[0217] Optionally, the first charging demand power may be greater than or equal to 300 kW. For example, the first charging demand power may 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.

[0218] The second charging demand power may be, for example, in the range of 150 kW - 300 kW. For example, the second charging demand power may 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.

[0219] Furthermore, the charging mode information may further include a third charging mode information. When the charging mode information includes the third charging mode information, the charging demand power includes the third charging demand power, and the third charging demand power is less than the second charging demand power.

[0220] Among them, the third charging mode information may be used to indicate the slow charging mode.

[0221] Exemplarily, the third charging demand power may be less than 150 kW. For example, the third charging demand power may be less than 5 kW, 7 kW, 10 kW, 30 kW, 50 kW, 70 kW, 90 kW, 110 kW, etc.

[0222] The above technical solution provides multiple charging modes, and the charging demand powers corresponding to the multiple charging modes are different. In this way, during 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.

[0223] In some embodiments, when the charging mode information includes the first charging mode information, the discharge power of the energy storage device includes the first discharge power; when the charging mode information includes the second charging mode information, the discharge power of the energy storage device includes the second discharge power. Among them, the first discharge power is greater than or equal to the second discharge power.

[0224] Optionally, the first discharge power may be less than the first charging demand power, and the second discharge power may be less than the second charging demand power.

[0225] The first discharge power may be greater than or equal to 300 kW. For example, the first discharge power may 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.

[0226] The second discharge power may be, for example, in the range of 150 kW - 300 kW. For example, the second discharge power may 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.

[0227] When the charging mode information includes the third charging mode information, the charging demand power may include a third discharge power, and the third discharge power is less than the second discharge power.

[0228] The third discharge power may be less than the third charging demand power. Exemplarily, the third discharge power may be less than 150 kW. For example, the third discharge power may be less than 5 kW, 7 kW, 10 kW, 30 kW, 50 kW, 70 kW, 90 kW, 110 kW, etc.

[0229] The above technical solutions provide multiple charging modes, and the discharge powers corresponding to the multiple charging modes are different. In this way, during 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.

[0230] In some embodiments, 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. Among them, the first discharge rate is greater than the second discharge rate.

[0231] Optionally, the first discharge rate may be greater than or equal to 2 times the rate. For example, the first discharge rate may be greater than or equal to 3 times the rate, 3.5 times the rate, 4 times the rate, 4.5 times the rate, 5 times the rate, 6 times the rate, 7 times the rate, 8 times the rate, 10 times the rate, etc.

[0232] The second discharge rate may be greater than or equal to 1 times the rate. For example, the second discharge rate may be greater than or equal to 2 times the rate, 2.5 times the rate, 3 times the rate, 3.5 times the rate, 4 times the rate, 4.5 times the rate, 5 times the rate, 5.5 times the rate, 6 times the rate, 7 times the rate, 8 times the rate, etc.

[0233] Those skilled in the art can understand that the first discharge rate and the second discharge rate can be the values in the foregoing examples, and only need to satisfy that the first discharge rate is greater than the second discharge rate. For example, the first discharge rate is 4 times the rate, and the second discharge rate is 2 times the rate.

[0234] When the charging mode information includes the third charging mode information, the discharge rate of the energy storage device may include a third discharge rate, and the third discharge rate is less than the second discharge rate.

[0235] The above technical solution provides multiple charging modes, and the discharge rates corresponding to the multiple charging modes are different. In this way, during 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.

[0236] In some embodiments, when the charging mode information includes the first charging mode information, the charging power includes a first charging power; when the charging mode information includes the second charging mode information, the charging power includes a second charging power. Among them, the first charging power is greater than or equal to the second charging power.

[0237] 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. The second charging power can be, for example, in the range of 150 kW - 300 kW. For example, the second charging 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.

[0238] When the charging mode information includes the third charging mode information, the charging power includes a third charging power, and the third charging power is less than the second charging power.

[0239] Exemplarily, 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.

[0240] The above technical solution provides multiple charging modes, and the charging powers corresponding to the multiple charging modes are different. In this way, during 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.

[0241] When the charging demand information includes charging mode information, as an example, S210 may specifically include: randomly selecting, from multiple pieces of charging mode information, the charging mode information for currently charging the battery device.

[0242] As another example, S210 may specifically include: obtaining the historical charging mode information of the battery device, and determining, based on the historical charging mode information, the charging mode information for currently charging the battery device.

[0243] For example, the charging mode information of the last charge of the battery device may be determined as the charging mode information for the current charge of the battery device.

[0244] For another example, based on the historical charging mode information, the charging mode information with the highest usage frequency may be determined, and the charging mode information with the highest usage frequency may be determined as the charging mode information for the current charge of the battery device.

[0245] As yet another example, S210 may specifically include: receiving the charging mode information.

[0246] For example, the battery device may determine the charging mode for the current charge according to its own battery state parameters. Then, the charging mode information indicating the determined charging mode is sent to the charging device.

[0247] For example, the charging mode information input by the user may be received. At this time, the charging mode information is used to indicate the charging mode selected by the user for the battery device.

[0248] Optionally, the user may input the charging mode information on the charging device. Or, the user may also input the charging mode information on the battery device, so that the battery device sends the charging mode information to the charging device.

[0249] The user may first determine the charging mode for the current charge of the battery device, and then send the charging mode information to the charging device.

[0250] The user may determine the charging mode based on multiple factors. For example, the user may determine the charging mode according to factors such as the remaining power of the battery device, charging cost, distance to the target location, available charging duration, user's personal habits, or the environment where the user is located. Specifically, if the current time is at night and the user needs to use the battery device the next morning, the user may select slow charging among multiple charging modes. Or, the user is on the highway and the remaining power of the battery device is low, then the user may select super charging among multiple charging modes to fully charge the battery device or charge it to a sufficient amount of power to reach the destination in a shorter time. Or, if the user prefers fast charging among multiple charging modes, the user may select fast charging among multiple charging modes.

[0251] In the above technical solution, the charging mode information of the battery device is obtained by receiving the charging mode information input by the user. The charging mode information obtained in this way is associated with the relevant situation of the user at the current moment. For example, if the user does not have much time to wait for the charging device to charge the battery device at the current moment, the user selects a charging mode with a higher power, which can effectively improve the user experience.

[0252] In some cases, the charging mode received by the charging device may not be suitable for the battery device or the charging device cannot support this charging mode. Therefore, the charging method 400 may further include: determining whether the charging mode matches the charging device and / or determining whether the charging mode matches the battery device. In the case of non-matching, a switching information is sent, and the switching information is used to indicate switching of the charging mode. At this time, S230 may specifically include: determining the charging parameters of the charging device according to the discharge capacity information and the switched charging mode.

[0253] For example, if the charging mode selected by the user is ultra-fast charging, but the charging device cannot provide ultra-fast charging to the battery device, the charging device may send switching information for indicating switching of the charging mode. For example, text or voice for switching ultra-fast charging to fast charging or slow charging may be displayed on the display interface.

[0254] For another example, if the charging mode selected by the user is ultra-fast charging, and the charging device determines that the battery device cannot support ultra-fast charging according to some parameters of the battery device, the charging device may send switching information for indicating switching ultra-fast charging to other charging modes.

[0255] In the above technical solution, after receiving the charging mode, it is determined whether the charging mode matches the charging device and / or whether the charging mode matches the battery device. In the case of non-matching, switching information for indicating switching of the charging mode is sent, so that the finally determined charging mode can be more matched with the charging device and the battery device, thereby achieving a better charging effect on the battery device and improving the user experience.

[0256] In addition to the charging mode information, the charging demand information may further include charging power information, and the charging power information may include one or more of the following information: charging duration, charging power, target power of the battery device, and charging cost.

[0257] At this time, the charging method 400 may further include: stopping charging the battery device when the charging operation matches the charging power information.

[0258] For example, the charging power information includes a charging duration of 2 hours. After the charging device charges the battery device for 2 hours, the charging device stops charging the battery device.

[0259] For another example, the charging power information includes the target power of the battery device, and the target power is full charge. After the charging device charges the battery device to full charge, the charging device stops charging the battery device.

[0260] In the above technical solution, the charging demand information includes one or more of the charging duration, the charging power, the target power of the battery device, and the charging cost, that is, the charging demand information may include multiple charging-related parameters. Thus, the accuracy rate of the charging parameters determined according to the charging demand information is relatively high, and further, the charging efficiency of charging the battery device based on the charging parameters is relatively high.

[0261] Of course, when the following situations occur, the charging device can also stop charging the battery device: the charging device fails, the battery device fails, the single-cell charging cut-off voltage exceeds the limit, the single-cell temperature exceeds the limit, and the charging current exceeds the limit, etc.

[0262] In addition to the energy storage device, the charging device may further include a power conversion device configured to charge the energy storage device with input power.

[0263] The power conversion device may include, for example, Figure 1 the alternating current / direct current (AC / DC) converter in. Or, the power conversion device may include, for example, an AC / DC converter and a direct current / direct current (DC / DC) converter.

[0264] The power conversion device may include a rated power. In some embodiments, the rated power may 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 discharge power of the energy storage device is greater than the rated power.

[0265] The value range of the rated power may be between 30kW and 150kW. For example, the rated power may be 50kW, 70kW, 80kW, 100kW, 110kW, 130kW, etc. The charging device provided by the embodiments of the present disclosure may 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 relatively small input power. If a larger input power is required, the working environment needs to be transformed, such as transformer capacity expansion, and the construction cost is relatively high. However, through the technical solution provided by the embodiments of the present disclosure, although the input power is relatively small, for example, the rated power input by the power conversion device includes 30kW - 150kW, it can still provide a high-power output to charge the battery device, thereby greatly improving the charging rate of the battery device.

[0266] 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 discharge power of the energy storage device can be greater than x times the rated power.

[0267] Exemplarily, x can be 1.5, 2, 3, 4, 5, 6 or a larger value.

[0268] In the above technical solution, 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 discharge power of the energy storage device is greater than x times the rated power. For example, when x is equal to 3, 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.

[0269] In some embodiments, the charging power can include the discharge power of the energy storage device. In other words, part or all of the charging power is derived from the discharge power of the energy storage device.

[0270] When all of the charging power is derived from the discharge power of the energy storage device, as Figure 3 shown, the energy storage device can charge the battery device alone. When part of the charging power is derived from the energy storage device, as Figure 4 shown, the energy storage device can charge the battery device together with other devices such as a power conversion device.

[0271] Of course, all of the charging power can also be derived from the discharge power of the power conversion device. At this time, as Figure 5 shown, the power conversion device charges the battery device independently.

[0272] In the above technical solution, the charging power includes the discharge power of the energy storage device, that is, part or all of the charging power is derived from the discharge power of the energy storage device. In other words, there are multiple ways for the charging device to charge the battery device. For example, the energy storage device can charge the battery device alone, or the energy storage device and other components can charge the battery device together. In this way, 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.

[0273] When the discharge capacity information meets the first preset condition, charging the battery device can include: charging the battery device independently through the energy storage device. When the discharge capacity information meets the 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 meets the third preset condition, charging the battery device includes: charging the battery device through the power conversion device.

[0274] In the above technical solution, when the discharge capacity information meets different preset conditions, the charging device charges the battery device through different devices. That is to say, 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.

[0275] The discharge capacity information may include, but is not limited to, the SOC of the energy storage device and the state of energy (SOE) of the energy storage device, etc.

[0276] When the discharge capacity information includes the SOC of the energy storage device, the discharge capacity information meeting the first preset condition may include: the SOC belongs to the first SOC range; and / or, the discharge capacity information meeting the second preset condition may include: the SOC belongs to the second SOC range; and / or, the discharge capacity information meeting the third preset condition may include: the SOC belongs to the third SOC range.

[0277] The first SOC range may be greater than or equal to 50% SOC. For example, the first SOC range may 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.

[0278] The second SOC range may be greater than or equal to 20% SOC and less than 50% SOC. For example, the second SOC range may 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.

[0279] The third SOC range may be less than 20% SOC. For example, the third SOC range may be less than 15% SOC, or less than 10% SOC, or less than 5% SOC.

[0280] Determine the component in the charging device that charges the battery device according to the state of charge of the energy storage device. In this way, the determined power supply conforms to the actual situation of the energy storage device, enabling the charging device to complete the charging of the battery device in a reasonable and effective manner.

[0281] When the discharge capacity information includes the SOE of the energy storage device, the discharge capacity information meeting the first preset condition may include: the SOE belongs to the first SOE range; and / or, the discharge capacity information meeting the second preset condition may include: the SOE belongs to the second SOE range; and / or, the discharge capacity information meeting the third preset condition may include: the SOE belongs to the third SOE range.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] Determine the component in the charging device that charges the battery device according to the energy state of the energy storage device. In this way, the determined power supply source conforms to the actual situation of the energy storage device, enabling the charging device to charge the battery device in a reasonable and effective manner.

[0286] Furthermore, the discharge capacity information can also indicate the maximum discharge power of the energy storage device. At this time, for the discharge capacity information to meet the first preset condition, it can include: the maximum discharge power belongs to the first power range; and / or, for the discharge capacity information to meet the second preset condition, it can include: the maximum discharge power belongs to the second power range; and / or, for the discharge capacity information to meet the third preset condition, it can include: the maximum discharge power belongs to the third power range.

[0287] The first power range can be greater than or equal to 300kW. For example, the first power range can be greater than or equal to 350kW, or greater than or equal to 400kW, or greater than or equal to 450kW, or greater than or equal to 500kW, or greater than or equal to 550kW, or greater than or equal to 600kW, or greater than or equal to 700kW, or greater than or equal to 800kW, etc.

[0288] The second power range can be, for example, in the range of 150kW - 300kW. For example, the second power range can be in the range of 180kW - 280kW, or the second power range can be in the range of 200kW - 250kW.

[0289] The third power range can be less than 150 kW, for example. 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.

[0290] In the above technical solution, the component for charging the battery device in the charging device is determined according to the maximum discharge power of the energy storage device. In this way, the determined power supply source conforms to the actual situation of the energy storage device, enabling the charging device to charge the battery device in a reasonable and effective manner.

[0291] In some embodiments, S220 may specifically include: determining the discharge capacity information of the energy storage device according to the electrical parameters of the energy storage device. Among them, the discharge capacity information indicates the maximum discharge power of the energy storage device.

[0292] The electrical parameters may include but are 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, etc.

[0293] The maximum discharge power can be used to determine the actual output power of the energy storage device.

[0294] In the above technical solution, the maximum discharge power of the energy storage device is determined according to the electrical parameters of the energy storage device, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage device, so that the determined charging parameters can conform to the actual situation of the energy storage device, and thus the charging device can charge the battery device in a reasonable and effective manner.

[0295] When the electrical parameters meet the fourth preset condition, the maximum discharge power includes the first maximum discharge power; when the electrical parameters meet the fifth preset condition, the maximum discharge power includes the second maximum discharge power; when the electrical parameters meet the sixth preset condition, the maximum discharge power includes the third maximum discharge power. Among them, the maximum discharge powers are arranged in ascending order as: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0296] When the electrical parameters include the SOC of the energy storage device, that the electrical parameters meet the fourth preset condition may include: the SOC meets the fourth SOC state range; and / or, that the electrical parameters meet the fifth preset condition may include: the SOC meets the fifth SOC state range; and / or, that the electrical parameters meet the sixth preset condition may include: the SOC meets the sixth SOC state range.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] In the above technical solution, the maximum discharge power of the energy storage device is determined according to the state of charge of the energy storage device, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage device, so that the determined charging parameters can conform to the current state of the energy storage device, and thus the charging device can complete the charging of the battery device in a reasonable and effective manner.

[0301] When the electrical parameter includes the SOE of the energy storage device, the electrical parameter satisfies the fourth preset condition, including: the SOE belongs to the fourth SOE range; and / or, the electrical parameter satisfies the fifth preset condition, including: the SOE belongs to the fifth SOE range; and / or, the electrical parameter satisfies the sixth preset condition, including: the SOE belongs to the sixth SOE range.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] In the above technical solution, the maximum discharge power of the energy storage device is determined according to the energy state of the energy storage device, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage device, so that the determined charging parameters can conform to the current state of the energy storage device, and thus the charging device can charge the battery device in a reasonable and effective manner.

[0306] In the embodiments of the present application, the magnitudes of the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0307] Moreover, on the premise of no conflict, the various embodiments described in the present application and / or the technical features in various embodiments can be combined with each other arbitrarily, and the technical solutions obtained after combination should also fall within the protection scope of the present application.

[0308] The charging method of the embodiments of the present application has been described in detail above. Next, the charging device of the embodiments of the present application will be described. 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.

[0309] Figure 6 A schematic block diagram of a charging device 100 according to an embodiment of the present application is shown. As Figure 6 shown, the charging device 100 includes an energy storage device 1010 and a control device 1020. The charging device 100 is configured to charge the battery device through the energy storage device 1010. The control device 1020 can be used to: Determine the charging demand information of the battery device, where the charging demand information is used to indicate the charging demand power of the battery device; Determine the discharge capacity information of the energy storage device; Determine the charging parameters of the charging device according to the discharge capacity information and the charging demand information; Charge the battery device according to the charging parameters, and the charging power corresponding to the charging parameters is less than or equal to the charging demand power.

[0310] Optionally, in the embodiments of the present application, the charging power includes the discharge power of the energy storage device.

[0311] Optionally, in the embodiments 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 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 per liter.

[0312] Optionally, in the embodiments of the present application, the charging demand information includes charging mode information. When the charging mode information includes the first charging mode information, the charging demand power includes the first charging demand power. When the charging mode information includes the second charging mode information, the charging demand power includes the second charging demand power; wherein, the first charging demand power is greater than the second charging demand power.

[0313] Optionally, in the embodiments of the present application, when the charging mode information includes the first charging mode information, the discharge power of the energy storage device includes the first discharge power. When the charging mode information includes the second charging mode information, the discharge power of the energy storage device includes the second discharge power; wherein, the first discharge power is greater than or equal to the second discharge power.

[0314] Optionally, in the embodiments of the present application, when the charging mode information includes the first charging mode information, the discharge rate of the energy storage device includes the first discharge rate. When the charging mode information includes the second charging mode information, the discharge rate of the energy storage device includes the second discharge rate; wherein, the first discharge rate is greater than the second discharge rate.

[0315] Optionally, in the embodiments of the present application, when the charging mode information includes the first charging mode information, the charging power includes the first charging power. When the charging mode information includes the second charging mode information, the charging power includes the second charging power; wherein, the first charging power is greater than the second charging power.

[0316] Optionally, in the embodiments 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.

[0317] Optionally, in the embodiments 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; when the charging mode does not match the charging device and / or the charging mode does not match the battery device, send switching information, and the switching information is used to indicate switching the charging mode; and determine the charging parameters according to the discharge capacity information and the switched charging mode.

[0318] Optionally, in the embodiments 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, the target power of the battery device, and charging cost; the control device 1020 is further configured to: stop charging the battery device when the charging operation matches the charging power information.

[0319] Optionally, in the embodiments of the present application, the charging device further includes a power conversion device configured to charge the energy storage device with input power. The power conversion device has a rated power, and 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.

[0320] Optionally, in the embodiments 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 discharge power of the energy storage device is greater than 3 times the rated power.

[0321] Optionally, in the embodiments of the present application, when the discharge capacity information meets the first preset condition, the control device is further configured to: charge the battery device independently through the energy storage device; when the discharge capacity information meets the second preset condition, the control device is further configured to: charge the battery device through the energy storage device and the power conversion device; when the discharge capacity information meets the third preset condition, the control device is further configured to: charge the battery device independently through the power conversion device.

[0322] Optionally, in the embodiments of the present application, the discharge capacity information includes the state of charge of the energy storage device; the discharge capacity information meeting the first preset condition includes: the state of charge belongs to the first state-of-charge range; and / or the discharge capacity information meeting the second preset condition includes: the state of charge belongs to the second state-of-charge range; and / or the discharge capacity information meeting the third preset condition includes: the state of charge belongs to the third state-of-charge range.

[0323] Optionally, in the embodiments of the present application, the discharge capacity information includes the energy state of the energy storage device; the discharge capacity information meeting the first preset condition includes: the energy state belongs to the first energy state range; and / or the discharge capacity information meeting the second preset condition includes: the energy state belongs to the second energy state range; and / or the discharge capacity information meeting the third preset condition includes: the energy state belongs to the third energy state range.

[0324] Optionally, in the embodiments of the present application, the discharge capacity information indicates the maximum discharge power of the energy storage device; the discharge capacity information meeting the first preset condition includes: the maximum discharge power belongs to the first power range; and / or the discharge capacity information meeting the second preset condition includes: the maximum discharge power belongs to the second power range; and / or the discharge capacity information meeting the third preset condition includes: the maximum discharge power belongs to the third power range.

[0325] Optionally, in the embodiments of the present application, the control device 1020 is specifically configured to: determine the discharge capacity information of the energy storage device according to the electrical parameters of the energy storage device, and the discharge capacity information indicates the maximum discharge power of the energy storage device.

[0326] Optionally, in the embodiments of the present application, when the electrical parameters meet the fourth preset condition, the maximum discharge power includes the first maximum discharge power; when the electrical parameters meet the fifth preset condition, the maximum discharge power includes the second maximum discharge power; when the electrical parameters meet the sixth preset condition, the maximum discharge power includes the third maximum discharge power; wherein, the maximum discharge powers from small to large are: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0327] Optionally, in the embodiments of the present application, the electrical parameters include the state of charge of the energy storage device; the electrical parameters meeting the fourth preset condition include: the state of charge belonging to the fourth state-of-charge range; and / or the electrical parameters meeting the fifth preset condition include: the state of charge belonging to the fifth state-of-charge range; and / or the electrical parameters meeting the sixth preset condition include: the state of charge belonging to the sixth state-of-charge range.

[0328] Optionally, in the embodiments of the present application, the electrical parameters include the energy state of the energy storage device; the electrical parameters meeting the fourth preset condition include: the energy state belonging to the fourth energy state range; and / or the electrical parameters meeting the fifth preset condition include: the energy state belonging to the fifth energy state range; and / or the electrical parameters meeting the sixth preset condition include: the energy state belonging to the sixth state-of-charge range.

[0329] Optionally, in the embodiments 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.

[0330] It should be understood that the charging device 100 can implement the corresponding operations in the charging method 400. For the sake of brevity, it will not be elaborated here.

[0331] Figure 7 It is a schematic diagram of the hardware structure of the charging device 100 in the embodiments 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.

[0332] 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 a program. When the program stored in the memory 1001 is executed by the processor 1002, the processor 1002 and the communication interface 1003 are used to execute the respective steps of the charging method in the embodiments of the present application.

[0333] The processor 1002 may 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, which are used to execute relevant programs to implement the functions required by the units in the device of the embodiments of the present application, or to execute the charging method of the embodiments of the present application.

[0334] The processor 1002 may also be an integrated circuit chip with the ability to process signals. In the implementation process, each step of the charging method of the embodiments of the present application may be completed by the integrated logic circuit in the hardware of the processor 1002 or the instructions in the form of software.

[0335] The above-mentioned processor 1002 may also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by the hardware processor, or executed and completed by the combination of the hardware and software modules in the processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 1001, and the processor 1002 reads the information in the memory 1001 and combines its hardware to complete the functions required by the units included in the charging device 100 of the embodiments of the present application, or to execute the charging method of the embodiments of the present application.

[0336] The communication interface 1003 uses a transceiver device such as, but not limited to, a transceiver to achieve communication between the charging device 100 and other devices or communication networks.

[0337] The bus 1004 may include a path for transmitting information between various components of the charging device 100 (for example, the memory 1001, the processor 1002, the communication interface 1003).

[0338] It should be noted that although the above charging device 100 only shows a memory, a processor, and a communication interface, in the specific implementation process, those skilled in the art should understand that the charging device 100 may also include other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the charging device 100 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the charging device 100 may also only include the devices necessary for implementing the embodiments of the present application, and do not have to include Figure 7 all the devices shown in

[0339] The embodiment of the present application also provides a computer-readable storage medium for storing a computer program, and the computer program is used to execute the methods of various embodiments of the present application described above.

[0340] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0341] The embodiment of the present application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer is caused to execute the above charging method.

[0342] According to the above technical solution, the maximum discharge power of the energy storage module is determined according to the energy state of the energy storage module, and then the charging parameters for charging the battery device are determined according to the maximum discharge power of the energy storage module, so that the determined charging parameters can conform to the current state of the energy storage module, and thus the charging device can charge the battery device in a reasonable and effective manner.

[0343] In the embodiment of the present application, the magnitudes of the serial numbers of the above processes do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

[0344] Moreover, on the premise of no conflict, the various embodiments described in the present application and / or the technical features in the various embodiments can be combined with each other arbitrarily, and the technical solutions obtained after combination should also fall within the protection scope of the present application.

[0345] 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.

[0346] The charging device disclosed in the embodiments of the present application can be used to charge devices that require fast charging / supercharging, such as electric vehicles, electric ships, and electric tools, and can also be used to charge devices that do not require fast charging / supercharging, such as electric vehicles, electric ships, and electric tools. That is to say, the charging device disclosed in the embodiments of the present application can achieve charging of electrical equipment according to high power and low power, and has a wide range of applications.

[0347] The charging device of the present application will be described below with reference to specific embodiments.

[0348] Figure 6 A schematic block diagram of the charging device 100 according to an embodiment of the present application is shown. As Figure 6 shown, the charging device 100 includes an energy storage module 110 and a control device 1020. The charging device 100 is configured to charge the battery device through the energy storage module 110. The control device 1020 can be used to: Determine the charging requirement information of the battery device, where the charging requirement information is used to indicate the charging requirement power of the battery device; Determine the discharge capacity information of the energy storage module; Determine the charging parameters of the charging device according to the discharge capacity information and the charging requirement information; Charge the battery device according to the charging parameters, where the charging power corresponding to the charging parameters is less than or equal to the charging requirement power.

[0349] Optionally, in the embodiments of the present application, the charging power includes the discharge power of the energy storage module.

[0350] Optionally, in the embodiments 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 discharge 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 / liter.

[0351] Optionally, in the embodiments of the present application, the charging requirement information includes charging mode information. When the charging mode information includes the first charging mode information, the charging requirement power includes the first charging requirement power. When the charging mode information includes the second charging mode information, the charging requirement power includes the second charging requirement power; where the first charging requirement power is greater than the second charging requirement power.

[0352] Optionally, in the embodiments of the present application, when the charging mode information includes the first charging mode information, the discharge power of the energy storage module includes the first discharge power. When the charging mode information includes the second charging mode information, the discharge power of the energy storage module includes the second discharge power; where the first discharge power is greater than or equal to the second discharge power.

[0353] Optionally, in the embodiments of the present application, when the charging mode information includes the first charging mode information, the discharge rate of the energy storage module includes the first discharge rate, and when the charging mode information includes the second charging mode information, the discharge rate of the energy storage module includes the second discharge rate; wherein, the first discharge rate is greater than the second discharge rate.

[0354] Optionally, in the embodiments of the present application, when the charging mode information includes the first charging mode information, the charging power includes the first charging power, and when the charging mode information includes the second charging mode information, the charging power includes the second charging power; wherein, the first charging power is greater than the second charging power.

[0355] Optionally, in the embodiments 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.

[0356] Optionally, in the embodiments 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; in the case where the charging mode does not match the charging device and / or the charging mode does not match the battery device, send switching information, and the switching information is used to indicate switching the charging mode; determine the charging parameters according to the discharge capacity information and the switched charging mode.

[0357] Optionally, in the embodiments 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, the target power of the battery device, and charging cost; the control device 1020 is further configured to: stop charging the battery device when the charging operation matches the charging power information.

[0358] Optionally, in the embodiments of the present application, the charging device further includes a power conversion device, and the power conversion device is configured to charge the energy storage module through the 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.

[0359] Optionally, in the embodiments 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 discharge power of the energy storage module is greater than 3 times the rated power.

[0360] Optionally, in the embodiments of the present application, when the discharge capacity information meets the first preset condition, the control device 1020 is further configured to: charge the battery device independently through the energy storage module; when the discharge capacity information meets the second preset condition, the control device 1020 is further configured to: charge the battery device through the energy storage module and the power conversion device; when the discharge capacity information meets the third preset condition, the control device 1020 is further configured to: charge the battery device independently through the power conversion device.

[0361] Optionally, in the embodiments of the present application, the discharge capacity information includes the state of charge of the energy storage module; the discharge capacity information meeting the first preset condition includes: the state of charge belonging to the first state-of-charge range; and / or the discharge capacity information meeting the second preset condition includes: the state of charge belonging to the second state-of-charge range; and / or the discharge capacity information meeting the third preset condition includes: the state of charge belonging to the third state-of-charge range.

[0362] Optionally, in the embodiments of the present application, the discharge capacity information includes the energy state of the energy storage module; the discharge capacity information meeting the first preset condition includes: the energy state belonging to the first energy state range; and / or the discharge capacity information meeting the second preset condition includes: the energy state belonging to the second energy state range; and / or the discharge capacity information meeting the third preset condition includes: the energy state belonging to the third energy state range.

[0363] Optionally, in the embodiments of the present application, the discharge capacity information indicates the maximum discharge power of the energy storage module; the discharge capacity information meeting the first preset condition includes: the maximum discharge power belonging to the first power range; and / or the discharge capacity information meeting the second preset condition includes: the maximum discharge power belonging to the second power range; and / or the discharge capacity information meeting the third preset condition includes: the maximum discharge power belonging to the third power range.

[0364] Optionally, in the embodiments of the present application, the control device 1020 is specifically configured to: determine the discharge capacity information of the energy storage module according to the electrical parameters of the energy storage module, and the discharge capacity information indicates the maximum discharge power of the energy storage module.

[0365] Optionally, in the embodiments of the present application, when the electrical parameters meet the fourth preset condition, the maximum discharge power includes the first maximum discharge power; when the electrical parameters meet the fifth preset condition, the maximum discharge power includes the second maximum discharge power; when the electrical parameters meet the sixth preset condition, the maximum discharge power includes the third maximum discharge power; where the maximum discharge powers are in ascending order: the third maximum discharge power, the first maximum discharge power, and the second maximum discharge power.

[0366] Optionally, in the embodiments of the present application, the electrical parameter includes the state of charge of the energy storage module; the electrical parameter satisfying the fourth preset condition includes: the state of charge belongs to the fourth state-of-charge range; and / or the electrical parameter satisfying the fifth preset condition includes: the state of charge belongs to the fifth state-of-charge range; and / or the electrical parameter satisfying the sixth preset condition includes: the state of charge belongs to the sixth state-of-charge range.

[0367] Optionally, in the embodiments of the present application, the electrical parameter includes the energy state of the energy storage module; the electrical parameter satisfying the fourth preset condition includes: the energy state belongs to the fourth energy state range; and / or the electrical parameter satisfying the fifth preset condition includes: the energy state belongs to the fifth energy state range; and / or the electrical parameter satisfying the sixth preset condition includes: the energy state belongs to the sixth state-of-charge range.

[0368] Optionally, in the embodiments 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.

[0369] It should be understood that the charging device 100 can implement the corresponding operations in the charging method 400. For the sake of brevity, it will not be elaborated here.

[0370] Figure 7 This is a schematic diagram of the hardware structure of the charging device 100 according to the embodiments 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.

[0371] 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 a program. When the program stored in the memory 1001 is executed by the processor 1002, the processor 1002 and the communication interface 1003 are used to execute the respective steps of the charging method according to the embodiments of the present application.

[0372] 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, and is used to execute relevant 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.

[0373] The processor 1002 may also be an integrated circuit chip with the ability to process signals. In the implementation process, each step of the charging method according to the embodiments of the present application may be completed by the integrated logic circuit in the hardware of the processor 1002 or the instructions in the form of software.

[0374] The above-mentioned processor 1002 may also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by the hardware processor, or completed by a combination of the hardware and software modules in the processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 1001, and the processor 1002 reads the information in the memory 1001 and combines its hardware to complete the functions required to be executed by the units included in the charging device 100 according to the embodiments of the present application, or executes the charging method according to the embodiments of the present application.

[0375] The communication interface 1003 uses a transceiver device such as, but not limited to, a transceiver to implement the communication between the charging device 100 and other devices or communication networks.

[0376] The bus 1004 may include a path for transmitting information between the various components of the charging device 100 (for example, the memory 1001, the processor 1002, the communication interface 1003).

[0377] It should be noted that although the above-mentioned charging device 100 only shows the memory, the processor, and the communication interface, in the specific implementation process, those skilled in the art should understand that the charging device 100 may also include other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the charging device 100 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the charging device 100 may also only include the devices necessary for implementing the embodiments of the present application, and do not necessarily include Figure 7 all the devices shown in

[0378] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program, which is used to execute the methods of various embodiments of the present application described above.

[0379] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0380] The embodiments of the present application also provide a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer is enabled to execute the above charging method.

[0381] Figure 8 It is a schematic structural diagram of a charging device 100 according to an embodiment of the present application.

[0382] In some embodiments, referring to Figure 8 , the energy storage device includes one or more energy storage modules 110. The energy storage module 110 includes one or more energy storage units, namely 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 terminal (+) and a first negative power supply terminal (-). One or more energy storage units are connected to the second positive power supply terminal (+) and the second negative power supply terminal (-) of the energy storage module 110 through the first positive power supply terminal and the first negative power supply terminal. The energy storage module 110 is configured to provide a first direct current. As an example, the energy storage unit may be an electrical box.

[0383] The charging device 100 further includes a charging module 120. The charging module 120 is connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110. 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.

[0384] 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 low-power charging, the energy storage units can be set to one or a small number of several, which can meet the low-power charging application scenario at this time; when the charging device 100 is used for high-power charging, the energy storage units can be set to multiple, which can meet the high-power and low-power charging application scenarios at this time. 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 high-power or low-power charging. Due to the modularization of the energy storage units, the energy storage units can be freely increased or decreased, can be quickly accessed, and high-power charging can be achieved without adding a transformer or expanding the transformer capacity.

[0385] When there is one energy storage unit, the first positive power supply terminal of the energy storage unit is connected to the second positive power supply terminal of the energy storage module 110, and the first negative power supply terminal of the energy storage unit is connected to the second negative power supply terminal of the energy storage module 110. The second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 are also connected to the charging module 120. During charging, the energy storage module 110 provides the first direct current through the energy storage unit, and the charging module 120 converts the first direct current to obtain the target direct current for charging 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 relevant parameters of the energy storage unit and the charging module 120 can be set based on the actual situation, and the charging requirements can be met through reasonable parameter configuration.

[0386] When there are multiple energy storage units, the multiple energy storage units can be connected in series, parallel, or series-parallel, and are connected to the charging module 120 through the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110. For example, in Figure 8 , the energy storage unit 1,..., the energy storage unit n - 1, and the energy storage unit n are connected in series between the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 through their respective first positive power supply terminals and first negative power supply terminals. At the same time, the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 are also connected to the charging module 120. During charging, when high-power charging is required, the energy storage module 110 provides the first direct current through multiple energy storage units. The first direct current can have a high power. Then the charging module 120 converts the first direct current to obtain the target direct current for charging the device to be charged, and the target direct current has a high power, so that the high-power charging application scenario can be met; when low-power charging is required, the first direct current can have a low power, and at the same time the target direct current has a low power, so that the low-power charging application scenario can be met. It should be noted that the relevant parameters of the energy storage unit and the charging module 120 can be set based on the actual situation, and the charging requirements can be met through reasonable parameter configuration. When there are multiple energy storage units, the power of the energy storage module is the sum of the powers of multiple energy storage units.

[0387] Exemplarily, 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 an appropriate number of energy storage units, the maximum charging output power of the charging module 120 can reach 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 during 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 requirements.

[0388] It can be understood that there is a certain multiple relationship between the maximum charging output power and the rated charging output power of the charging module 120, such as a multiple relationship of 1.1 - 1.2. Therefore, 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.

[0389] In practical applications, 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 simultaneously.

[0390] In the above embodiments, by configuring modular energy storage units inside the charging device, or by setting modular energy storage units and modular charging units outside the charging device, that is, by setting an energy storage module and a charging module outside the charging device, the energy storage units and charging units can be freely increased or decreased. When high-power charging is required, through the free and rapid access of the energy storage units, not only can high-power charging be achieved, such as fast charging / ultra-fast charging, but also there is no need to additionally increase the transformer or expand the transformer capacity, which can reduce the transformer cost.

[0391] 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.

[0392] In one example, the input module 130 can be an AC - DC conversion unit. Taking the input module 130 as an AC-DC conversion unit as an example, the input module 130 can be adapted to provide charging energy for the energy storage unit. In different power usage environments, whether it is an old urban area with relatively tight power supply or a remote area sensitive to infrastructure construction costs, the charging device, by virtue of the cooperation between the input module 130 and the energy storage module 110, adjusts the power supply parameters to the energy storage module 110 through the input module 130, thereby achieving the function of fast charging without relying on complex external power supply upgrades, enhancing the applicability and flexibility of the charging device in various scenarios.

[0393] Thus, the power grid can charge the energy storage unit through the input module 130.

[0394] In some embodiments, the maximum output power of the input module 130 is less than or equal to 150 kW, and / or the rated output power of the input module 130 is less than or equal to 125 kW.

[0395] Specifically, the input module 130 is mainly used to charge each energy storage unit in the energy storage module 110, and the charging is at low power. Exemplarily, the maximum output power of the input module 130 is less than or equal to 150 kW. For example, the maximum output power can be 150 kW, 100 kW, 85 kW, etc. It should be noted that the output power here refers to the maximum output power, and during actual charging, it can be downward compatible. For example, when the maximum output power is 150 kW, it means that the output power of 0 - 150 kW can be used to charge each energy storage unit in the energy storage module 110.

[0396] In this example, the input module 130 has a low-power output, while the charging module 120 can have a high-power output. Therefore, the entire charging device 100 can achieve high-power output with a low-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, due to the capacity limitation of the transformer, the maximum output power of the input module 130 will also be limited. For example, the maximum output power is 150 kW. At this time, each energy storage unit in the energy storage module 110 is charged with low power. However, when the energy storage module 110 discharges externally to charge the device to be charged, high-power charging can be achieved based on multiple energy storage units. For example, the maximum charging output power of the charging module 120 is 360 kW. In this way, high-power output with low-power input is achieved, enabling the charging device to meet the high-power charging demand without additional transformer or transformer capacity expansion. Those skilled in the art can understand that the power grid generally refers to a system that can provide electricity. As an example, the power grid can be the power source of municipal electricity.

[0397] It can be understood that there is a certain multiple relationship between the maximum output power and the rated output power of the input module 130, such as a multiple relationship of 1.1 - 1.2. Therefore, the rated output power of the input module 130 can be less than or equal to 125 kW.

[0398] In practical applications, the maximum output power of the input module 130 can be restricted, the rated output power can be restricted, or both can be restricted simultaneously.

[0399] In the above embodiment, by configuring a modular energy storage unit inside the charging device 100 and limiting the maximum output power and / or the rated power of the input module 130 within the above range, the charging device 100 can be flexibly connected to a conventional power grid. The output power of most public power grids or commercial power interfaces has certain restrictions. The power setting of the input module 130 can smoothly obtain charging energy from the conventional power environment without modifying the existing power supply lines, improving the access feasibility of the charging device 100 in various power usage scenarios to facilitate the installation of the charging device 100; moreover, it can achieve high-power charging with a small-power input, enabling the charging device 100 to meet high-power charging requirements without additionally increasing the transformer or expanding the transformer capacity. During the peak power consumption period, when multiple electrical devices are operating simultaneously, the energy storage module supplies power to multiple electrical devices, and the input module 130 stably charges the energy storage unit with a lower power, which can effectively reduce the impact of the charging device 100 on the power grid during the charging process and contribute to maintaining the stability of the power grid.

[0400] 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.

[0401] 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 achieve high-power output with a small-power input. Exemplarily, 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 the maximum output power of the input module 130 is 40 kW, then the maximum charging output power of the charging module 120 is greater than or equal to 500 kW.

[0402] 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, it can be 15, 12.5, 10.3, 9, 7, 6, etc. Exemplarily, 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 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.

[0403] 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, etc. Specifically, it is selected and set according to actual requirements.

[0404] In this way, by restricting the ratio between the maximum charging output power of the charging module 120 and the maximum output power of the input module 130, it is possible to have a high cost performance and good performance when achieving low-power input and high-power output.

[0405] It can be understood that there is a certain multiple relationship between the maximum charging output power of the charging module 120 and the rated charging output power, such as a multiple relationship of 1.1 - 1.2. Meanwhile, there is a certain multiple relationship between the maximum output power of the input module 130 and the rated output power, such as 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.

[0406] In practical applications, 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 restricted, 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 restricted, or both can be restricted simultaneously.

[0407] In the above embodiments, by restricting the ratio of the maximum charging output power of the charging module to the maximum output power of the input module, and / or restricting the ratio of the rated charging output power of the charging module to the rated output power of the input module, on the one hand, problems such as current shock and overheating generated 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 with low power, and the energy storage module then outputs to the charging module 120 with controllable high power, realizing low-power input to the energy storage module 110 and high-power output of the charging module 120. In addition, the energy storage module 110 can flexibly adjust the output power according to its own stored power and the power consumption requirements of the electrical device, enabling the charging device 100 to reasonably distribute electrical energy, reduce unnecessary energy consumption, improve the cost performance of the charging device 100, and enable the charging device 100 to operate stably when inputting with low power and outputting with high power.

[0408] In some embodiments, each energy storage unit includes a battery subunit, and the ratio of the rated output power of the input module 130 to the rated energy of the battery subunit is greater than or equal to 1 / n1, where the value range of n1 is 1-4.

[0409] Specifically, the rated energy of the battery subunit refers to the energy capacity specified in the design of the battery subunit, which represents the maximum energy value that the battery subunit can store or output under normal working conditions, and the unit is kilowatt-hour. The rated output power of the input module 130 ≥ the rated energy of the battery subunit / n1 / 100%, where n1 can be 1, 1.4, 2, 3, 4, etc. By stipulating that the rated output power of the input module should be 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 matches the rated energy of the battery subunit, and it will not cause the input module 130 to charge the battery subunit too slowly and affect the use of the energy storage unit; at the same time, stipulating that the rated energy of the battery subunit is small can also mean that the volume of the battery subunit is small, so that the energy storage unit occupies a small area and is convenient for installation; further realizing a small-volume energy storage unit, realizing low-power input and high-power output, and improving the user experience.

[0410] In some embodiments, each energy storage unit includes a battery subunit, and the ratio of the rated energy of the battery subunit to the rated charging output power of the charging module 120 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.

[0411] That is to say, the rated energy of the battery subunit ≥ 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. With such settings, while ensuring the charging performance, 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, during the charging process, the battery subunit can stably supply energy to the charging module 120, reducing the instability or interruption of the charging power caused by insufficient energy supply. Taking n2 = 94% and n3 = 6 as an example, the relatively large denominator requires the battery subunit to have a relatively high rated energy to match the power of the charging module 120. This enables the charging device 100 to continuously and stably operate during long-term and high-power charging, reducing the probability of failures, lowering the maintenance cost, thus extending the service life of the charging device 100 and improving the cost performance.

[0412] In some embodiments, each energy storage unit includes a battery subunit, and the ratio between the rated energy 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 watt-hours per liter.

[0413] That is to say, the ratio of the rated energy to the rated power of the battery subunit is not greater than 1:3. Exemplarily, when the rated power of the battery subunit is 350 kW, the rated energy of the battery subunit is 58 kWh. Such settings can improve the cost performance of the entire charging device.

[0414] The volumetric energy density of the battery subunit is greater than or equal to 380 watt-hours per liter, and can be, for example, 380 watt-hours per liter, 400 watt-hours per liter, 600 watt-hours per liter, or 900 watt-hours per liter, etc. It can be understood that the higher the energy density of the battery subunit, the smaller the corresponding volume, thereby saving space, reducing the construction cost, and being able to provide high-power output simultaneously.

[0415] When the charging device 100 outputs at high power (the maximum charging output power of the charging module is above 350 kW), the ratio between the rated energy 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 watt-hours per liter, enabling the rated energy of the battery subunit to match the rated power, reducing the grid fluctuations caused by the insufficient rated energy of the battery subunit due to high-power output and requiring power supply from the power grid, which is beneficial to improving the reliability and stability of the charging device 100. Moreover, when outputting at high power, the charging device 100 can continuously and stably operate, reducing the probability of failures, lowering the maintenance cost, thus extending the service life of the charging device 100 and improving the cost performance.

[0416] 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 rate. For example, the maximum discharge rate is greater than or equal to 5C rate, 6C rate, 7C rate or 8C rate, etc. Thus, high-power output can be provided.

[0417] It should be noted that the above parameters can be superimposed. Exemplarily, 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, the maximum discharge rate of the battery subunit is greater than or equal to 4C rate, and the maximum output power of the input module 130 can be less than or equal to 150 kW.

[0418] It should be noted that the above relevant parameters of the battery subunit are also applicable to the energy storage unit and / or the energy storage module in some cases. That is to say, in some cases, the above parameters are applicable to the energy storage unit, the energy storage module and the battery subunit. Exemplarily, when the energy storage unit only includes a battery subunit, the relevant parameters of the battery subunit are also the relevant parameters of the energy storage unit. Further, when the energy storage module 110 includes one energy storage unit, the relevant parameters of the battery subunit are also the relevant parameters of the energy storage module 110; and so on.

[0419] It should be noted that the energy storage unit can include one or more battery subunits, and the multiple battery subunits can be connected in series, parallel or series-parallel. Each battery subunit can be a single cell, or can be formed by multiple single cells connected in series, parallel or series-parallel. Exemplarily, the single cell can include 10 - 100, and 2 - 6 battery subunits can be obtained by combining the single cells, and the 2 - 6 battery subunits are connected in series and / or parallel, and the power of the energy storage unit can reach 80 kWh - 150 kWh through the 2 - 6 battery subunits. For example, 80 kWh can be achieved by combining 2 single cells; another example, 150 kWh can be achieved by combining 100 single cells; and another example, 90 kWh can be achieved by combining 80 single cells; and so on.

[0420] In the above embodiments, by restricting 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.

[0421] In some embodiments, one or more energy storage units are connected in series and / or parallel between the second positive power terminal and the second negative power terminal of the energy storage module 110 through the first positive power terminal and the first negative power terminal to provide the first direct current.

[0422] Specifically, when there is one energy storage unit, the first positive power supply terminal of the energy storage unit is connected to the second positive power supply terminal of the energy storage module 110, and the first negative power supply terminal of the energy storage unit is connected to the second negative power supply terminal of the energy storage module 110, and the first direct current is provided by the energy storage unit.

[0423] When there are multiple energy storage units, the multiple energy storage units can be connected in series, in parallel, or in a combination of series and parallel. For example, referring to Figure 8 , the multiple energy storage units are connected in series between the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 through their own first positive power supply terminals and first negative power supply terminals; another example, referring to Figure 10 , the multiple energy storage units are connected in parallel between the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 through their own first positive power supply terminals and first negative power supply terminals; yet another example, the multiple energy storage units can be first connected in series and then in parallel, or first connected in parallel and then in series between the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110. The first direct current is provided by the multiple energy storage units connected in series, in parallel, or in a series-parallel combination, and the specific connection method can be selected based on the actual situation.

[0424] In the above embodiments, the multiple energy storage units can be connected in series, in parallel, or in a series-parallel combination, which can realize the free access of the energy storage units to meet different charging power requirements.

[0425] 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 a second direct current based on the electrical energy of the battery subunit.

[0426] Exemplarily, referring to Figure 11a , energy storage unit 1 includes battery subunit BAT1,..., energy storage unit n-1 includes battery subunit BATn-1, and energy storage unit n includes battery subunit BATn. Each energy storage unit provides a 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.

[0427] In some embodiments, referring to Figure 11b , at least some of the one or more energy storage units further include a first power conversion subunit, and the first power conversion subunit is respectively connected to the corresponding battery subunit and the first positive power supply terminal and the first negative power supply terminal of the energy storage unit, and is configured to convert the electrical energy of the battery subunit into a second direct current; wherein, in the case where the energy storage unit does not include the first power conversion 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.

[0428] Specifically, when there is one energy storage unit, the energy storage unit further includes a first power conversion subunit to convert the electrical energy of the battery subunit into a second direct current.

[0429] When there are multiple energy storage units, a first power conversion subunit can be provided in each of the multiple energy storage units, or a first power conversion subunit can be provided in some of the multiple energy storage units. Exemplarily, in Figure 11b Energy storage unit 1 includes a battery subunit BAT1 and a first power conversion subunit 1. The first power conversion subunit 1 is respectively connected to the battery subunit BAT1, the first positive power supply terminal and the first negative power supply terminal of energy storage unit 1. The electrical energy of the battery subunit BAT1 is converted into a second direct current through the first power conversion subunit 1;...; Energy storage unit n-1 includes a battery subunit BATn-1 and a first power conversion subunit n-1. The first power conversion subunit n-1 is respectively connected to the battery subunit BATn-1, the first positive power supply terminal and the first negative power supply terminal of energy storage unit n-1. The electrical energy of the battery subunit BATn-1 is converted into a second direct current through the first power conversion subunit n-1; Energy storage unit n includes a battery subunit BATn. The battery subunit BATn is directly connected to the first positive power supply terminal and the first negative power supply terminal of energy storage unit n to provide a second direct current.

[0430] 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 charging, 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.

[0431] In the above embodiments, a first power conversion subunit can be provided in some or all of the multiple energy storage units to convert the electrical energy of the battery subunit to provide a second direct current. This can improve the charging flexibility. At the same time, by partially providing the first power conversion subunit, the cost can be reduced while meeting the charging requirements. Moreover, this method can achieve access with and without the first power conversion subunit, and has high applicability.

[0432] In some embodiments, referring to Figure 11c, at least some of the one or more energy storage units further include a first switch subunit, and the first switch subunit is respectively connected to 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 connect the corresponding battery subunit to the first positive power terminal and the first negative power terminal of the energy storage unit when conducting, so as 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 terminal and the first negative power terminal of the corresponding energy storage unit to provide a second direct current.

[0433] Specifically, when there is one energy storage unit, the energy storage unit further includes a first switch subunit. When the first switch subunit conducts, the battery subunit is connected to the first positive power terminal and the first negative power terminal of the energy storage unit to provide a second direct current; in case of an abnormality, such as an abnormality of the battery subunit or the charging module 120, etc., the first switch subunit disconnects 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 disconnects to stop the battery subunit from providing the second direct current.

[0434] When there are multiple energy storage units, a first switch subunit can be provided in each of the multiple energy storage units, or a first switch subunit can be provided in some of the multiple energy storage units. Exemplarily, in Figure 11c , the energy storage unit 1 includes a battery subunit BAT1 and a first switch subunit 1. The first switch subunit 1 is respectively connected to the battery subunit BAT1 and the first positive power terminal and the first negative power terminal of the energy storage unit 1. The on-off of the connection between the battery subunit BAT1 and the first positive power terminal and the first negative power terminal of the energy storage unit 1 is controlled by the first switch subunit 1 to selectively provide a second direct current;...; the energy storage unit n - 1 includes a battery subunit BATn - 1 and a first switch subunit n - 1. The first switch subunit n - 1 is respectively connected to the battery subunit BATn - 1 and the first positive power terminal and the first negative power terminal of the energy storage unit n - 1. The on-off of the connection 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 is controlled by the first switch subunit n - 1 to selectively provide a second direct current; the energy storage unit n includes a battery subunit BATn, and 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 a second direct current.

[0435] In the above embodiments, some or all of the multiple energy storage units can be provided with a first switch subunit, and the first switch subunit is used to selectively control the battery subunit to provide a second direct current, so as to improve the charging flexibility and protection in case of an abnormality.

[0436] In some embodiments, referring toFigure 11d One or at least some of the one or more energy storage units further include a first power conversion subunit and a first switching subunit. The first power conversion subunit and the first switching subunit are connected in series between the corresponding battery subunit and the first positive power supply terminal and the first negative power supply terminal of the energy storage unit. The first power conversion subunit is configured to convert the electrical energy of the battery subunit into a second direct current when the corresponding first switching subunit is turned on; wherein, when the energy storage unit does not include the first power conversion subunit and the first switching 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.

[0437] Specifically, when there is one energy storage unit, the energy storage unit further includes a first power conversion subunit and a first switching subunit. When the first switching subunit is turned on, the first power conversion subunit converts the electrical energy of the battery subunit into a second direct current; in case of an abnormality, such as an abnormality of the battery subunit or the charging module 120, etc., the first switching subunit is turned off and the first power conversion subunit stops working 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 the power demand, the first switching subunit is turned off and the first power conversion subunit stops working to make the battery subunit stop providing the second direct current.

[0438] When there are multiple energy storage units, a first switching subunit and a first power conversion subunit can be provided in each of the multiple energy storage units, or a first switching subunit and a first power conversion subunit can be provided in some of the multiple energy storage units. Exemplarily, in Figure 11d Energy storage unit 1 includes battery subunit BAT1, first switching subunit 1 and first power conversion subunit 1. The first switching subunit 1 and the first power conversion subunit 1 are connected in series between battery subunit BAT1 and the first positive power supply terminal and the first negative power supply terminal of energy storage unit 1. When the first switching subunit 1 is turned on, the first power conversion subunit 1 converts the electrical energy of battery subunit BAT1 into a second direct current;...; Energy storage unit n - 1 includes battery subunit BATn - 1, first switching subunit n - 1 and first power conversion subunit n - 1. The first switching subunit n - 1 and the first power conversion subunit n - 1 are connected in series between battery subunit BATn - 1 and the first positive power supply terminal and the first negative power supply terminal of energy storage unit n - 1. When the first switching subunit n - 1 is turned on, the first power conversion subunit n - 1 converts the electrical energy of battery subunit BATn - 1 into a second direct current; Energy storage unit n includes battery subunit BATn, and battery subunit BATn is directly connected to the first positive power supply terminal and the first negative power supply terminal of energy storage unit n to provide the second direct current.

[0439] It should be noted that in some embodiments, some of the energy storage units may include the first switch sub-unit, and the other part may include the first power conversion sub-unit, and there is no specific limitation here.

[0440] In the above embodiments, some or all of the multiple energy storage units may be provided with the first switch sub-unit and the first power conversion sub-unit, so as to improve the charging flexibility and the protection ability in abnormal situations.

[0441] In some embodiments, the first power conversion sub-unit is a bidirectional DCDC sub-unit, and the charging and discharging of the battery sub-unit are realized through the bidirectional DCDC sub-unit. The bidirectional DCDC sub-unit includes but is not limited to a BUCK-BOOST circuit, etc., and there is no specific limitation here.

[0442] In some embodiments, referring to Figure 12a , the input module 130 includes input interfaces (X, Y), the input interfaces are connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110, and are configured to provide charging energy for each energy storage unit based on the third direct current provided by the first external power supply 210.

[0443] 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. Exemplarily, the first external power supply 210 may 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 respectively connected to the secondary winding of the first transformer and the input interface to convert the first alternating current into the third direct current and transmit it to the energy storage module 110 through the input interface.

[0444] The first AC-DC conversion module may be a unidirectional ACDC sub-unit or a bidirectional ACDC sub-unit. When the first AC-DC conversion module is a bidirectional ACDC sub-unit, not only can the energy storage module 110 be charged, but also the electric energy of the energy storage module 110 can be fed back to the AC power grid. The specific circuit structure of the unidirectional ACDC sub-unit or the bidirectional ACDC sub-unit is not limited here.

[0445] 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 first external power supply 210.

[0446] In the above embodiments, when the external power supply provides direct current, the battery sub-unit can be charged through the input interface.

[0447] In some embodiments, referring to Figure 12b, the input module 130 includes a second power conversion subunit 131. The second power conversion subunit 131 is connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110, and is configured to provide charging energy for each energy storage unit based on the first alternating current provided by the second external power supply 220.

[0448] Specifically, the second external power supply 220 is used to generate the first alternating current and supply it to the second power conversion subunit 131 in the input module 130, and charge each battery subunit in the energy storage module 110 through the second power conversion subunit 131. Exemplarily, the second external power supply 220 may include a first transformer. The primary winding of the first transformer is connected to the AC power grid. The second power conversion subunit 131 is respectively connected to the secondary winding of the first transformer and the energy storage module 110. The first transformer converts the second alternating current provided by the AC power grid into the first alternating current and supplies it 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.

[0449] The second power conversion subunit 131 may be a unidirectional ACDC subunit or a bidirectional ACDC subunit. When the second power conversion subunit 131 is a bidirectional ACDC subunit, not only can the energy storage module 110 be charged, but also the electric energy 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.

[0450] 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 second power conversion subunit 131.

[0451] In the above embodiment, when the external power supply provides alternating current, the battery subunit can be charged through the second power conversion subunit.

[0452] In some embodiments, please refer 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.

[0453] The number of charging guns 122 can be one, two or more than three. Exemplarily, the number of charging guns 122 is two. The maximum charging output power or the rated output power of each charging gun 122 can be 500kW, and can charge the same electrical device at the same time. The electrical device can be an electric vehicle. Each charging gun 122 can also charge different electrical devices separately.

[0454] When the number of charging guns 122 is multiple, the multiple charging guns 122 can be connected to the energy storage module 110 through the same charging module conversion unit, and each charging gun 122 can also be separately connected to 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 single-direction DCDC conversion unit or a unipolar bidirectional DCDC conversion unit, and can also be a bipolar single-direction DCDC conversion unit or a bipolar bidirectional DCDC conversion unit.

[0455] The charging module conversion unit can flexibly adjust parameters such as voltage and current according to the direct current output by the energy storage module 110 and the requirements of the device (such as an electric vehicle) connected to the charging gun 122, so as to achieve efficient charging output. The configuration of at least one charging gun 122 enables the charging device 100 to charge one or more electrical devices simultaneously. In public charging areas, such as parking lots and charging stations, multiple users can simultaneously use different charging guns 122 to charge their electric vehicles, improving the usage efficiency and service capacity of the charging device 100, meeting the usage requirements in large-scale charging demand scenarios, effectively alleviating the problem of charging queue waiting, and enhancing the user experience.

[0456] 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 terminal and the negative input terminal of the third power conversion subunit 121 are correspondingly connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110, and the positive output terminal and the negative output terminal of the third power conversion subunit 121 are correspondingly connected to the positive input terminal and the negative input terminal of the charging gun 122. 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.

[0457] 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. The first direct current is converted into a fourth direct current by the third power conversion subunit 121 and provided to the charging gun 122, and the charging gun 122 provides it to the device to be charged to charge the device to be charged.

[0458] In this example, the third power conversion subunit 121 is bipolar, that is, it has a positive input terminal and a negative input terminal. At this time, the positive input terminal and the negative input terminal of the third power conversion subunit 121 are directly connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110, and the positive output terminal and the negative output terminal of the third power conversion subunit 121 are directly connected to the positive input terminal and the negative input terminal of the charging gun 122. The negative input terminal of the charging gun 122 and the second negative power supply terminal of the energy storage module 110 are not shared. In this way, it is applicable to the application scenario where the third power conversion subunit 121 is bipolar.

[0459] 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, it can not only charge the device to be charged, but also feed the electric energy of the device to be charged to the energy storage module 110, and can also be fed to the AC power grid in the previous example through the input module 130, finally realizing the free conversion of electric energy among the grid, charging and storage.

[0460] 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 terminal of the fourth power conversion subunit 123 is connected to the second positive power supply terminal of the energy storage module 110, the positive output terminal of the fourth power conversion subunit 123 is connected to the positive input terminal of the charging gun 122, the negative input terminal of the charging gun 122 is connected to the second negative power supply terminal of the energy storage module 110, and the fourth power conversion subunit 123 is configured to convert the first direct current into a fourth direct current for charging output through the charging gun 122.

[0461] Specifically, when charging the device to be charged, one or more energy storage units provide a second direct current, so that the energy storage module 110 provides a first direct current. The first direct current is converted into a fourth direct current by the fourth power conversion subunit 123 and provided to the charging gun 122, and is provided by the charging gun 122 to the device to be charged to charge the device to be charged.

[0462] In this example, the fourth power conversion subunit 123 is unipolar, that is, it only has a positive input terminal. At this time, the positive input terminal of the fourth power conversion subunit 123 is directly connected to the second positive power supply terminal of the energy storage module 110, the positive output terminal of the fourth power conversion subunit 123 is directly connected to the positive input terminal of the charging gun 122, and the negative input terminal of the charging gun 122 is directly connected to the second negative power supply terminal of the energy storage module 110, that is, the negative input terminal of the charging gun 122 and the second negative power supply terminal of the energy storage module 110 are shared. In this way, it is applicable to the application scenario where the fourth power conversion subunit 123 is unipolar and has low cost.

[0463] The fourth power conversion subunit 123 can be a unipolar unidirectional DCDC subunit or a unipolar bidirectional DCDC subunit. When the fourth power conversion subunit 123 is a unipolar bidirectional DCDC subunit, it can not only charge the device to be charged, but also feed the electrical energy of the device to be charged to the energy storage module 110, or feed it to the AC power grid in the aforementioned example through the input module 130, ultimately realizing the free conversion of electrical energy among the grid, charging, and energy storage.

[0464] In the above embodiments, by sharing or not sharing the negative input terminal of the charging gun, different power supply scenarios can be adapted, improving the selection range during the circuit structure selection.

[0465] In some embodiments, referring to Figure 14 , the energy storage module 110 further includes a selection unit 111. The selection unit 111 is connected to one or more energy storage units and is 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 terminal and the second negative power supply terminal of the energy storage module 110 to provide the first direct current.

[0466] Specifically, during charging, the selection unit 111 can select one energy storage unit 1 to be connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 to provide the first direct current; or select all the energy storage units 1,..., energy storage unit n - 1, and energy storage unit n to be connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 to provide the first direct current. Then, the charging module 120 outputs a charge based on the first direct current.

[0467] In the above embodiments, by selectively controlling the output of the energy storage unit through the selection unit, the flexibility of charging can be improved to meet different charging requirements.

[0468] In some embodiments, referring to Figure 15 , both the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 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 terminal of the corresponding energy storage unit and the second positive power supply terminal of the energy storage module 110. The first negative power supply terminals of one or more energy storage units are respectively connected to the second negative power supply terminal of the energy storage module 110. The second switch subunit is configured to connect the first positive power supply terminal of the corresponding energy storage unit to the second positive power supply terminal of the energy storage module 110 when conducting.

[0469] Specifically, the selection unit 111 includes a second switch subunit K1, ..., a second switch subunit Kn-1, and a second switch subunit Kn. Among them, the second switch subunit K1 is connected in series between the first positive power supply terminal of the energy storage unit 1 and the second positive power supply terminal of the energy storage module 110, ..., the second switch subunit Kn-1 is connected in series between the first positive power supply terminal of the energy storage unit n-1 and the second positive power supply terminal of the energy storage module 110, and the second switch subunit Kn is connected in series between the first positive power supply terminal of the energy storage unit n and the second positive power supply terminal 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. At this time, the charging module 120 converts the first direct current into the fourth direct current to charge the device to be charged.

[0470] In the above embodiment, by setting a second positive power supply terminal and selectively controlling the energy storage unit to provide the second direct current through the selection unit, the charging flexibility can be improved to meet the charging requirements.

[0471] 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 terminal and the negative input terminal of the fifth power conversion subunit 124 are correspondingly connected to the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110. The positive output terminal and the negative output terminal of the fifth power conversion subunit 124 are correspondingly connected to the positive input terminal and the negative input terminal of the charging gun 122. The fifth power conversion subunit 124 is configured to convert the first direct current into the fourth direct current and output it through the charging gun 122 for charging.

[0472] It should be noted that for the connection relationship between the fifth power conversion subunit 124 and the charging gun 122 and the energy storage module 110, as well as the structure of the fifth power conversion subunit 124, please refer to the relevant description of the third power conversion subunit 121 above, and details are not repeated here.

[0473] 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 terminal of the sixth power conversion subunit 125 is connected to the second positive power supply terminal of the energy storage module 110. The positive output terminal of the sixth power conversion subunit 125 is connected to the positive input terminal of the charging gun 122. The negative input terminal of the charging gun 122 is connected to the second negative power supply terminal of the energy storage module 110. The sixth power conversion subunit 125 is configured to convert the first direct current into the fourth direct current and output it through the charging gun 122 for charging.

[0474] It should be noted that for the connection relationship between the sixth power conversion subunit 125, the charging gun 122 and the energy storage module 110, and the structure of the sixth power conversion subunit 125, please refer to the relevant description of the fourth power conversion subunit 123 mentioned above, and details will not be elaborated here.

[0475] In some embodiments, referring to Figure 17 , the energy storage module 110 includes multiple second positive power supply terminals and one second negative power supply terminal. The selection unit 111 includes multiple second switch subunits. Each second switch subunit is connected to an energy storage unit and a second positive power supply terminal. Each second switch subunit is connected in series between the first positive power supply terminal of the corresponding energy storage unit and the corresponding second positive power supply terminal. The first negative power supply terminals of one or more energy storage units are respectively connected to the second negative power supply terminal of the energy storage module 110. The second switch subunit is configured to connect the first positive power supply terminal of the corresponding energy storage unit to the corresponding second positive power supply terminal when conducting.

[0476] Specifically, the selection unit 111 includes second switch subunits K1,..., second switch subunit Kn-1, and second switch subunit Kn. Among them, the second switch subunit K1 is connected in series between the first positive power supply terminal of the energy storage unit 1 and a second positive power supply terminal of the energy storage module 110,..., the second switch subunit Kn-1 is connected in series between the first positive power supply terminal of the energy storage unit n-1 and another second positive power supply terminal of the energy storage module 110, and the second switch subunit Kn is connected in series between the first positive power supply terminal of the energy storage unit n and yet another second positive power supply terminal of the energy storage module 110. By controlling the on / off of the second switch subunits, the corresponding energy storage units are selected to provide the second direct current, so that the energy storage module 110 provides the first direct current. 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 here includes multiple second direct currents, and the charging module 120 can selectively convert one or more second direct currents into the fourth direct current.

[0477] In the above embodiments, by setting multiple second positive power supply terminals and selectively controlling the energy storage units to provide the second direct current through the selection unit, the charging flexibility can be improved to meet the charging requirements.

[0478] In some embodiments, referring to Figure 18a , the charging module 120 includes multiple seventh power conversion subunits and a charging gun 122. The positive input terminal and the negative input terminal of each seventh power conversion subunit are correspondingly connected to a second positive power supply terminal and a second negative power supply terminal. The positive output terminal and the negative output terminal of each seventh power conversion subunit are correspondingly connected to the positive input terminal and the negative input terminal of the charging gun. 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.

[0479] Specifically, the multiple seventh power conversion sub-units are respectively the seventh power conversion sub-unit 1, ..., the seventh power conversion sub-unit n-1, and the seventh power conversion sub-unit n. Among them, the positive input terminal of the seventh power conversion sub-unit 1 is connected to a second positive power supply terminal, ..., the positive input terminal of the seventh power conversion sub-unit n-1 is connected to another second positive power supply terminal, the positive input terminal of the seventh power conversion sub-unit n is connected to yet another second positive power supply terminal, and the negative input terminals 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 all connected to the second negative power supply terminal. The positive output terminals and the negative output terminals 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 to the positive input terminal and the negative input terminal of the charging gun 122 correspondingly.

[0480] In this example, each seventh power conversion sub-unit can convert the second direct current of the corresponding energy storage unit into the fifth direct current, and finally the multiple seventh power conversion sub-units output the fourth direct current.

[0481] 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, it can not only charge the device to be charged, but also feed the electric energy of the device to be charged to the energy storage module 110, and can also be fed to the AC power grid in the aforementioned example through the input module 130, finally realizing the free conversion of electric energy among the grid, charging, and storage.

[0482] In some embodiments, referring to Figure 18b , the charging module 120 includes multiple eighth power conversion sub-units and the charging gun 122. The positive input terminal of each eighth power conversion sub-unit is connected to a second positive power supply terminal, the positive output terminal of each eighth power conversion sub-unit is connected to the positive input terminal of the charging gun 122, the negative input terminal of the charging gun 122 is connected to the second negative power supply terminal of the energy storage module 110, and the multiple eighth power conversion sub-units are configured to convert the first direct current into the fourth direct current and output it through the charging gun 122 for charging.

[0483] Specifically, multiple eighth power conversion subunits are respectively the eighth power conversion subunit 1, ..., the eighth power conversion subunit n-1, and the eighth power conversion subunit n. Among them, the positive input terminal of the eighth power conversion subunit 1 is connected to a second positive power supply terminal, ..., the positive input terminal of the eighth power conversion subunit n-1 is connected to another second positive power supply terminal, the positive input terminal of the eighth power conversion subunit n is connected to yet another second positive power supply terminal. The positive output terminals of the eighth power conversion subunit 1, ..., the eighth power conversion subunit n-1, and the eighth power conversion subunit n are all connected to the positive input terminal of the charging gun 122, and the negative input terminal of the charging gun 122 is connected to the second negative power supply terminal of the energy storage module 110.

[0484] In this example, each eighth power conversion subunit can convert the second direct current of the corresponding energy storage unit into the fifth direct current, and finally multiple eighth power conversion subunits output the fourth direct current.

[0485] The eighth power conversion subunit can be a unipolar unidirectional DCDC subunit or a unipolar bidirectional DCDC subunit. When the eighth power conversion subunit is a unipolar bidirectional DCDC subunit, it can not only charge the device to be charged, but also feed the electrical energy of the device to be charged 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.

[0486] In the above embodiments, by sharing or not sharing the negative input terminal of the charging gun, different power supply scenarios can be adapted, and the selection range in circuit structure selection is increased.

[0487] In some embodiments, referring to Figure 19a , the input module 130 includes a ninth power conversion subunit 132. The ninth power conversion subunit 132 is connected to one or more energy storage units and is configured to provide charging energy for each energy storage unit based on the first alternating current provided by the second external power supply 220.

[0488] Specifically, the second external power supply 220 is used to generate the first alternating current and provide it to the ninth power conversion subunit 132 in the input module 130, and charge each battery subunit in the energy storage module 110 through the ninth power conversion subunit 132. Exemplarily, the second external power supply 220 may include a second transformer. The primary winding of the second transformer is connected to the AC power grid, and the secondary winding of the second transformer is connected to the ninth power conversion subunit 132. The second transformer converts the second alternating current provided by the AC power grid into the first alternating current and provides it to the ninth power conversion subunit 132, and the ninth power conversion subunit 132 converts the first alternating current into the third direct current to charge the energy storage module 110.

[0489] Exemplarily, the second external power supply 220 is a three-phase AC power supply, and the ninth power conversion subunit 132 is a unidirectional three-phase ACDC subunit or a bidirectional three-phase ACDC subunit. At this time, 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 also the electric energy of the energy storage module 110 can be fed to the AC power grid. Thus, in 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° between phases. The specific circuit structure of the unidirectional three-phase ACDC subunit or the bidirectional three-phase ACDC subunit is not limited here.

[0490] 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.

[0491] In the above embodiment, when the external power supply provides alternating current, the battery subunit can be charged through the ninth power conversion subunit.

[0492] In some embodiments, referring to Figure 19b , the input module 130 includes a plurality of tenth power conversion subunits, each tenth power conversion subunit is connected to an energy storage unit, and 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.

[0493] Specifically, the plurality of tenth power conversion subunits are respectively the tenth power conversion subunit 1,..., the tenth power conversion subunit n - 1, and the tenth power conversion subunit n. Among them, the tenth power conversion subunit 1 is respectively connected to the second external power supply 220 and the energy storage unit 1,..., the tenth power conversion subunit n - 1 is respectively connected to the second external power supply 220 and the energy storage unit n - 1, and the tenth power conversion subunit n is respectively 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.

[0494] Exemplarily, the second external power supply 220 is a three-phase AC power supply, and there are three tenth power conversion subunits. Each tenth power conversion subunit is a unidirectional single-phase ACDC subunit or a bidirectional single-phase ACDC subunit. At this time, each tenth power conversion subunit is connected to one phase of the three-phase AC 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 energy storage module 110 be charged, but also the electric energy of the energy storage module 110 can be fed to the AC power grid. And when feeding, the three bidirectional single-phase ACDC subunits cooperate with each other to form three-phase alternating current and feed it to the three-phase AC power grid. In this way, in the three-phase alternating current, a single phase is realized by the energy storage unit, and three energy storage units can realize the function of three-phase alternating current. The specific circuit structure of the unidirectional single-phase ACDC subunit or the bidirectional single-phase ACDC subunit is not limited here.

[0495] 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 sum of the maximum output power and the rated output power of the multiple tenth power conversion subunits.

[0496] In the above embodiment, when the external power supply provides alternating current, the battery subunits can be charged through multiple tenth power conversion subunits.

[0497] In some embodiments, referring to Figure 20 , the charging device 100 further includes a wireless communication module 140. 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 perform information interaction with external devices through the wireless communication module 140.

[0498] It should be noted that in the above embodiment, multiple charging device architectures are provided. For example, multiple energy storage units can be connected in series, in parallel, or in series-parallel; some or all of the multiple 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 adopt a unipolar power conversion subunit or a bipolar power conversion subunit, and the negative input terminals of the corresponding charging piles can be shared or not shared; in three-phase alternating current, a single phase is realized by the energy storage unit, and three energy storage units can realize the function of three-phase alternating current; the input module can be AC input or DC input; and so on.

[0499] To enable those skilled in the art to understand the present application more clearly, specific examples are described below, but this should not be construed as a limitation to the present application.

[0500] Example 1, referring to Figure 21, the energy storage module 110 includes a plurality of energy storage units, each energy storage unit includes a battery subunit and a first power conversion subunit, the first power conversion subunit can be a bidirectional DCDC subunit, and a plurality of energy storage units are connected in series between the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110, and the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110 are connected to the DC bus, that is, a plurality of energy storage units are connected in series and then connected 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 terminal, a high-voltage negative input terminal, and a high-voltage positive output terminal and a high-voltage negative output terminal, and the third power conversion subunit 121 can be a bipolar bidirectional DCDC subunit. The input module 130 includes a second power conversion subunit 131, and the second power conversion subunit 131 can be a bidirectional ACDC subunit. The second external power supply 220 includes a first transformer connected to the AC power grid.

[0501] When charging the energy storage module 110, the first transformer converts the second alternating current provided by the AC power grid into the first alternating current, and after converting it into direct current through the bidirectional ACDC subunit, it charges each battery subunit in the energy storage module 110 through the DC bus.

[0502] When charging the device to be charged, the energy storage unit provides the second direct current based on the electrical energy of the battery subunit, and the energy storage module 110 obtains the first direct current based on the second direct current. The first direct current is converted into the fourth direct current after being transformed by the high-power bipolar bidirectional DCDC subunit, and is charged to the device to be charged through the charging gun 122 to achieve high-power charging, and then achieve fast charging / supercharging of the device to be charged.

[0503] 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 the free switching of electrical energy among the device to be charged, the energy storage module 110 and the AC power grid.

[0504] Example two, refer 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 terminal and a high-voltage positive output terminal, and the high-voltage negative input terminal of the charging gun 122 is directly connected to the second negative power supply terminal of the energy storage module 110, that is, the negative poles of the charging gun 122 and the energy storage module 110 share the same connection. The fourth power conversion subunit 123 can be a unipolar bidirectional DCDC subunit. For the same content, to avoid redundancy, it will not be elaborated here.

[0505] Example three, refer to Figure 23 , compared with the example shown in Figure 21In the shown example, the difference is that multiple energy storage units are connected in parallel between the second positive power supply terminal and the second negative power supply terminal of the energy storage module 110, that is, multiple energy storage units are connected in parallel to the DC bus.

[0506] Example 4, referring to Figure 24 , this example compared with Figure 23 the shown example, the difference is that the fourth power conversion subunit 123 only has a high-voltage positive input terminal and a high-voltage positive output terminal, and the high-voltage negative input terminal of the charging gun 122 is directly connected to the second negative power supply terminal of the energy storage module 110, that is, the negative poles of the charging gun 122 and the energy storage module 110 share the same connection, and the fourth power conversion subunit 123 can be a unipolar bidirectional DCDC subunit.

[0507] Example 5, referring to Figure 25 , this example compared with Figure 21 the shown example, the difference is that some of the multiple energy storage units include battery subunits, and the other part of the energy storage units include battery subunits and the 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.

[0508] Example 6, referring to Figure 26 , this example compared with Figure 25 the shown example, the difference is that the fourth power conversion subunit 123 only has a high-voltage positive input terminal and a high-voltage positive output terminal, and the high-voltage negative input terminal of the charging gun 122 is directly connected to the second negative power supply terminal of the energy storage module 110, that is, the negative poles of the charging gun 122 and the energy storage module 110 share the same connection, and the fourth power conversion subunit 123 can be a unipolar bidirectional DCDC subunit.

[0509] Example 7, referring to Figure 27 , this example compared with Figure 23 the shown example, 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 case of an abnormality.

[0510] In the above Examples 1 to 7, the energy storage module 110 and the charging module 120 are both connected to the DC bus, that is, the charging device 100 adopts a DC bus design. When both the energy storage module 110 and the charging module 120 are provided in multiple numbers, 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 sub-unit is greater than or equal to 350 kW, the rated power of the battery sub-unit is greater than or equal to 350 kW, the rated energy of the battery sub-unit is greater than or equal to 58 kWh, the maximum discharge rate of the battery sub-unit is greater than or equal to 4C, the maximum output power of the first power conversion sub-unit is greater than or equal to 350 kW, and the rated power of the first power conversion sub-unit 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 sub-unit is not greater than 1:4.

[0511] Example 8, referring to Figure 28 , the energy storage module 110 includes three energy storage units 1, 2, and 3 and a selection unit 111. Each energy storage unit includes a battery sub-unit, and the selection unit 111 includes three second switch sub-units K1, K2, and K3. The charging module 120 includes a fifth power conversion sub-unit 124 and a charging gun 122. The fifth power conversion sub-unit 124 has a high-voltage positive input terminal, a high-voltage negative input terminal, a high-voltage positive output terminal, and a high-voltage negative output terminal. The fifth power conversion sub-unit 124 can be a bipolar bidirectional DCDC sub-unit. The input module 130 includes three tenth power conversion sub-units, and the tenth power conversion sub-unit can be a bidirectional single-phase ACDC sub-unit. The second external power supply 220 includes a second transformer connected to the AC power grid.

[0512] When charging the energy storage module 110, the second transformer converts the second alternating current provided by the AC power grid into the first alternating current, and after converting it into direct current through the bidirectional single-phase ACDC sub-unit, it charges the corresponding battery sub-unit. Among them, each bidirectional single-phase ACDC sub-unit is connected to a phase of the AC bus. For example, the bidirectional single-phase ACDC sub-unit 1 is connected to phase A, the bidirectional single-phase ACDC sub-unit 2 is connected to phase B, and the bidirectional single-phase ACDC sub-unit 3 is connected to phase C. It should be noted that under the action of the bidirectional single-phase ACDC sub-unit, when the electric energy in the energy storage module 110 is fed to the AC power grid, the three bidirectional single-phase ACDC sub-units can cooperate with each other to generate three-phase alternating current with a phase difference of 120°, so that the output of three-phase alternating current can be realized through the three energy storage units.

[0513] When charging the device to be charged, the energy storage unit provides a second direct current based on the power of the battery subunit, and the energy storage module 110 selectively outputs the second direct current through the selection unit 111 to obtain the first direct current. The first direct current is converted by the high-power bipolar bidirectional DCDC subunit to obtain the fourth direct current, and the device to be charged is charged through the charging gun 122 to achieve high-power charging, thereby achieving fast charging / super charging of the device to be charged. In some examples, the second switch subunits K1, K2, and K3 can be closed separately in time and order to keep the power in the three energy storage units consistent.

[0514] 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 AC power grid, thereby realizing free switching of electric energy between the device to be charged, the energy storage module 110 and the AC power grid.

[0515] Example 9, refer to Figure 29 , this example is compared to Figure 28 The example shown is different in that the sixth power conversion subunit 125 only has a high-voltage positive input terminal and a high-voltage positive output terminal, and the high-voltage negative input terminal of the charging gun 122 is directly connected to the second negative power supply terminal of the energy storage module 110, that is, the negative pole of the charging gun 122 and the energy storage module 110 is shared, and the sixth power conversion subunit 125 can be a unipolar bidirectional DCDC subunit.

[0516] In the above examples 8 to 9, the energy storage module 110 and the charging module 120 are both connected to the AC bus, that is, the charging device 100 adopts an AC bus design. When there are multiple energy storage modules 110 and charging modules 120, multiple charging devices 100 share the AC bus.

[0517] In the above examples 1 to 9, the charging device 100 can communicate with external devices, including but not limited to cloud service / monitoring platforms, through the wireless communication module 140 to achieve 4G / 5G communication, etc. The cloud service / monitoring platform selects the appropriate peak and valley time period according to the peak and valley time period of the area where the charging device 100 is located, and sends it to the charging device 100, so that the charging device 100 can achieve peak load shaving and valley filling. For example, during the peak period of the AC power grid, the AC power grid does not charge the energy storage module 110, and during the valley period of the AC power grid, the energy storage module 110 is slowly charged through the AC power grid.

[0518] It should be noted that the above examples 1 to 9 are merely exemplary descriptions. Based on the inventive concept of this application, through reasonable setting of the above-mentioned architecture, they should all be within the protection scope of this application.

[0519] To further illustrate the implementation of the solution where the rated charging output power of the charging module of the present application is greater than or equal to 290 kW, the following provides a detailed description for the battery sub-units.

[0520] In the present application, each energy storage unit may include battery sub-units. A battery sub-unit may include one or more single-cell battery cores. A single-cell battery core may include an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive active material. The negative electrode plate includes a negative current collector and a negative electrode film layer disposed on at least one side of the negative current collector. The negative electrode film layer includes a negative active material. Optionally, the single-cell battery core further includes a housing, and the electrode assembly and the electrolyte are accommodated in the housing. The negative electrode film layer includes at least one layer of film layer, which may be a single-layer film layer or at least two layers of film layers. Optionally, the negative electrode film layer includes at least two layers of film layers. Similarly, the positive electrode film layer may be a single-layer film layer or at least two layers of film layers. During the charge and discharge process of the single-cell battery core, active ions such as lithium ions are embedded and extracted back and forth between the positive electrode plate and the negative electrode plate, and the electrolyte plays a role in conducting the active ions between the positive electrode plate and the negative electrode plate.

[0521] The following specifically elaborates on the electrolyte, the positive electrode plate, the negative electrode plate, and the separator: [Electrolyte] In some embodiments, the electrolyte includes an electrolyte salt, and 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.

[0522] By setting the electrolyte to include lithium hexafluorophosphate at the above concentration, the battery sub-unit has a high ionic conductivity, thereby improving the charging rate of the charging device, and also enabling the battery sub-unit to have high interfacial stability and high thermal stability; lithium hexafluorophosphate has little influence on the severity of thermal runaway, enabling the battery sub-unit to have an appropriate severity of thermal runaway and a low risk of thermal diffusion, so that the charging device has high reliability when the power output is above 350 kW.

[0523] In some embodiments, the electrolyte further includes an organic solvent, and the organic solvent includes a carbonate solvent.

[0524] Optionally, the carbonate solvent includes one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate. Further optionally, the carbonate solvent includes one or more of ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate.

[0525] Further optionally, the mass content of the carbonate solvent in the organic solvent is 10% to 70%, and may be optionally one of 30% to 50% or 10% to 30% or 30% to 70%.

[0526] Exemplarily, the mass content of the carbonate 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 solvent with the above mass content can further improve the conductivity of the electrolyte at room temperature, which is beneficial to the migration of lithium ions.

[0527] Exemplarily, the carbonate solvent includes one or more of ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate, and the mass content of the carbonate solvent is 30% to 50%.

[0528] Adding a carbonate solvent to the electrolyte can improve various performances of the battery subunit. For example, it can improve the charge and discharge efficiency, cycle performance, low-temperature performance, and high-voltage stability of the battery subunit, so that the battery subunit can improve the battery discharge stability when outputting high power.

[0529] In some embodiments, 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.

[0530] Exemplarily, the concentration of 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.

[0531] Exemplarily, based on the total mass of the electrolyte, the proportion of lithium hexafluorophosphate can be, but is not limited to, 10% - 25%.

[0532] By setting the electrolyte to include lithium hexafluorophosphate with the above concentration, the battery subunit has a high ionic conductivity, thereby improving the charging rate of the charging device 100. Moreover, it also makes the battery subunit have high interfacial stability and high thermal stability; lithium hexafluorophosphate has little influence on the severity of thermal runaway, making the battery subunit have an appropriate severity of thermal runaway and a low risk of thermal diffusion, so that the charging device has high reliability when outputting power above 350 kW.

[0533] In some embodiments, the electrolyte salt further includes a fluorosulfonylimide salt, and the concentration of the fluorosulfonylimide salt is in the range of 0.2 mol / L - 0.5 mol / L.

[0534] The fluorosulfonylimide salt may include one or more of lithium bis(fluorosulfonyl)imide LiFSI and lithium bis(trifluoromethanesulfonyl)imide LiTFSI.

[0535] Optionally, the lithium salt includes lithium bis(fluorosulfonyl)imide LiFSI and lithium hexafluorophosphate LiPF 6 , the molar concentration of lithium bis(fluorosulfonyl)imide LiFSI is 0.2 mol / L to 0.5 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF 6 is 0.5 mol / L to 1.0 mol / L.

[0536] Exemplarily, the molar concentration of lithium bis(fluorosulfonyl)imide LiFSI is 0.4 mol / L to 0.5 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF 66 is 0.7 mol / L.

[0537] Exemplarily, the molar concentration of lithium bis(fluorosulfonyl)imide LiFSI is 0.5 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF 6 is 0.5 mol / L.

[0538] Exemplarily, the molar concentration of lithium bis(fluorosulfonyl)imide LiFSI is 0.2 mol / L, and the molar concentration of lithium hexafluorophosphate LiPF 6 is 0.8 mol / L.

[0539] Optionally, the ratio of the molar concentration of lithium bis(fluorosulfonyl)imide to the molar concentration of lithium hexafluorophosphate LiPF 6 is 0.2 to 1.0, and may be 0.2 to 0.5. Exemplarily, the ratio of the molar concentration of lithium bis(fluorosulfonyl)imide to the molar concentration of lithium hexafluorophosphate LiPF 6 is 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 values.

[0540] In the embodiments of the present application, the types and contents of the inorganic components / lithium salt concentration in the electrolyte have meanings well known in the art, and can be detected by equipment and methods well known in the art. For example, reference can be made to the standard JY / T 020-1996 "General Rules for Ion Chromatography Analysis Methods" to qualitatively or quantitatively analyze the inorganic components / lithium salt concentration in the electrolyte by ion chromatography analysis method. In the embodiments of the present application, freshly prepared electrolyte can be taken as a sample, free electrolyte of a fresh battery can be taken as a sample, or a discharged battery (discharged to the lower cut-off voltage so that the charged state of the battery is about 0% SOC) can be disassembled in reverse, and the free electrolyte obtained from the battery can be taken as a sample, and detected by ion chromatography analysis method.

[0541] In the embodiments of the present application, the types and contents of the organic components in the electrolyte have meanings well-known in the art, and can be detected by devices and methods well-known in the art. For example, qualitative and quantitative analysis of the organic components in the electrolyte can be carried out by gas chromatography with reference to GB / T9722-2006 General Rules for Chemical Reagents - Gas Chromatography. In the embodiments of the present application, newly prepared electrolyte can be taken as a sample, free electrolyte of a fresh battery can be taken as a sample, or a battery that has been fully discharged (discharged to the lower cut-off voltage so that the charged state of the battery is about 0% SOC) can be disassembled in reverse, and the free electrolyte obtained from the battery can be taken as a sample for detection by ion chromatography analysis method.

[0542] In the embodiments of the present application, after quantitatively and qualitatively detecting each component in the electrolyte, each component is classified. Chain carboxylic ester solvents and carbonate solvents (such as ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate) are used as the constituent components of the organic solvent. Based on the mass of the organic solvent being 100%, the mass content of each component is calculated.

[0543] Carbonate additives (such as vinylene carbonate, fluoroethylene carbonate), sulfur-containing additives, and lithium salt additives are used as additives in the electrolyte. Based on the mass of the electrolyte being 100%, the mass content of each component is calculated.

[0544] Since the fluorosulfonylimide salt has the characteristics of low viscosity and high ionic conductivity, the electrolyte including the above-mentioned concentration of fluorosulfonylimide salt is beneficial to improving the charging rate of the battery subunit, and thus improving the charging rate of the charging device.

[0545] In some embodiments, the organic solvent includes chain carboxylic ester solvents. Based on the total mass of the solvent, the mass content A of the chain carboxylic ester solvents satisfies: 5% ≤ A ≤ 75%.

[0546] Among them, the chain carboxylic ester solvents include compounds with the following structures:

[0547] Among them, R 1 includes at least one of a hydrogen atom, a C1-C5 alkyl group, or a C1-C5 haloalkyl group, and R 2 includes a C1-C5 alkyl group and / or a C1-C5 haloalkyl group.

[0548] The mass content of the chain carboxylic acid ester solvent relative to the mass of the organic solvent is greater than or equal to 5% and less than or equal to 75%, optionally greater than or equal to 10% and less than or equal to 75%, optionally 30% to 70%, and optionally 50% to 70%. Exemplarily, the mass content of the chain carboxylic acid ester solvent is 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% or a range composed of any two of the above values.

[0549] When the mass content of the chain carboxylic acid ester solvent is within the above range, the viscosity of the electrolyte system is relatively small, which is beneficial to the migration of lithium ions.

[0550] The above chain carboxylic acid ester solvent has a high conductivity, which is beneficial to improving the fast charging ability of the single cell.

[0551] Optionally, R 1 includes a hydrogen atom, a halogen atom, a C1-C3 alkyl group or a C1-C3 haloalkyl group. Further optionally, R 1 includes a hydrogen atom, a halogen atom, a C1-C2 alkyl group or a C1-C2 haloalkyl group.

[0552] Optionally, R 2 includes a C1-C3 alkyl group or a C1-C3 haloalkyl group. Further optionally, R 2 includes a C1-C2 alkyl group or a C1-C2 haloalkyl group.

[0553] In the above embodiments, the halogen atom includes one or more of a fluorine atom, a chlorine atom, a bromine atom and an iodine atom. Optionally, the halogen atom includes a fluorine atom.

[0554] In the above embodiments, the haloalkyl group includes one or more of a fluoroalkyl group, a chloroalkyl group, a bromoalkyl group and an iodoalkyl group. Optionally, the haloalkyl group includes a fluoroalkyl group.

[0555] Exemplarily, the chain carboxylic acid ester solvent includes one or more of the compounds shown in Formula I-1 to Formula I-8,

[0556] In this technical solution, the solvent includes a carboxylic acid ester solvent. In this way, the electrolyte can have a higher ionic conductivity and a relatively low viscosity, which is beneficial to further improving the fast charging performance of the charging device, such as fast charging performance and / or supercharging performance.

[0557] In some embodiments, the conductivity of the electrolyte at room temperature is from 13 mS / cm to 20 mS / cm, optionally from 15 mS / cm to 20 mS / cm. Exemplarily, the conductivity of the electrolyte at room temperature is 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 composed of any two of the above values.

[0558] When the conductivity of the electrolyte at room temperature, such as 25 °C, is within the above range, the migration rate of lithium ions in the electrolyte is relatively high, which can further reduce the internal resistance of the single cell, thereby reducing heat generation and improving the fast charging performance of the single cell.

[0559] In the embodiments of the present application, the conductivity of the electrolyte at room temperature, such as 25 °C, is the ionic conductivity, and it can be detected by using the equipment and methods well-known in the art. For example, it can be tested with reference to the industry standard HG-T 4067-2015.

[0560] In some embodiments, the viscosity of the electrolyte at room temperature is from 2.3 mPa·s to 3.5 mPa·s. Exemplarily, the viscosity of the electrolyte is 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 composed of any two of the above values.

[0561] When the viscosity of the electrolyte at room temperature, such as 25 °C, is within the above range, the migration rate of lithium ions in the electrolyte is relatively high, which can further reduce the internal resistance of the single cell, thereby reducing heat generation and improving the fast charging performance of the single cell.

[0562] In the embodiments of the present application, the viscosity of the electrolyte has the meaning well-known in the art and can be detected by using the equipment and methods well-known in the art. For example, it can be detected according to GB / T10247-2008.

[0563] In some embodiments, the density of the electrolyte at room temperature, such as 25 °C, is from 1.05 g / mL to 1.35 g / mL. Exemplarily, the density of the electrolyte is 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 composed of any two of the above values.

[0564] When the density of the electrolyte is within the above range, the migration rate of lithium ions in the electrolyte is relatively high, which can further reduce the internal resistance of the single cell, thereby reducing heat generation and improving the fast charging performance of the single cell.

[0565] In the embodiments of the present application, the density of the electrolyte has the meaning well known in the art and can be detected by using the equipment and methods well known in the art. For example, it can be tested with reference to GB / T 2013-2010.

[0566] The electrolyte includes an organic solvent and an electrolyte salt. The types of the organic solvent and the electrolyte salt are not specifically limited and can be selected according to actual needs.

[0567] In some embodiments, the electrolyte further contains additives. The additives can include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery performance, such as additives for improving the overcharge performance of the battery, additives for improving the high-temperature performance of the battery, additives for improving the low-temperature power performance of the battery, etc.

[0568] In some embodiments, the additives include one or more of carbonate additives, sulfur-containing additives, and lithium salt additives, and can be selected as at least two. The above additives can improve the interfacial film performance on the positive electrode side and / or the negative electrode side, which is beneficial to improving the fast charging performance of the single cell and improving the cycle performance.

[0569] In some embodiments, the mass content of the additives in the electrolyte is 1% to 10%, optionally 2% to 8%, and further optionally 3.5% to 8%. Exemplarily, the mass content of the additives in the electrolyte is 1%, 2%, 3%, 3.5%, 4%, 5%, 6%, 7%, 8%, 9%, 10% or the range composed of any two of the above values.

[0570] The additives with the above mass content can effectively improve the interfacial film performance on the positive electrode side and / or the negative electrode side, which is beneficial to improving the fast charging performance of the single cell and improving the cycle performance.

[0571] Exemplarily, the carbonate additives include one or more of vinylene carbonate VC and fluoroethylene carbonate FEC.

[0572] Exemplarily, the sulfur-containing additives include one or more of ethylene sulfate DTD, bis(ethylene sulfate) 2-DTD, butene sulfite BS, 1,3-propane sultone PS, ethylene sulfite ES, and methylene methanedisulfonate MMDS.

[0573] Optionally, the lithium salt additives include lithium difluorophosphate LiPO 2 F2 , one or more of lithium difluoro(oxalato)borate (LiDFOB), lithium tetrafluoroborate (LiBF 4 , and lithium bis(oxalato)borate (LiBOB).

[0574] Optionally, the mass content of vinylene carbonate (VC) in the electrolyte is 0.5% to 9%, optionally 2% to 6%.

[0575] Optionally, the mass content of fluoroethylene carbonate (FEC) in the electrolyte is 0.1% to 4%, optionally 0.5% to 3%.

[0576] 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%.

[0577] 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%.

[0578] In some embodiments, the single cell satisfies: 2.45 g / Ah ≤ d / A ≤ 3.5 g / Ah, optionally 2.45 g / Ah ≤ d / A ≤ 3.3 g / Ah, where d represents the mass of the electrolyte in the single cell, in g, and A represents the rated capacity of the single cell, in Ah. Exemplarily, 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 composed of any two of the above values.

[0579] d / A can reflect the liquid retention ability of the electrolyte. When d / A is in the above range, the electrolyte can play a better wetting role on the positive electrode and the negative electrode, and can also improve the migration rate of lithium ions in the liquid phase, which is beneficial to improving the fast charging ability of the single cell.

[0580] In the embodiments of the present application, d / A of the single cell can be understood as the liquid retention coefficient, and can be detected by using the equipment and methods well-known in the art. For example, taking the upper limit voltage of battery charging as 3.65 V and the cut-off voltage of battery discharging as 2.0 V as an example in accordance with GB / T31486-2015 "Electrical Performance Requirements and Test Methods for Power Batteries for Electric Vehicles".

[0581] At 25°C, the single-cell battery is charged at 0.33C to 3.65V, then charged at a constant voltage until 0.05C, and then discharged at a constant current of 0.33C to 2.0V. The discharged capacity A is used as the denominator. The single-cell battery is weighed as M0, and then the positive electrode plate, negative electrode plate, separator, and electrolyte are disassembled. The free electrolyte is placed in a bag. All the above solid components are baked in an oven at 60°C for more than 4 hours (including but not limited to the positive electrode plate, negative electrode plate, and separator, and also including other mechanical parts of the disassembled single-cell battery that contribute to M0). Then, all the components of the single-cell battery are weighed as M1. The weight difference between M0 and M1 is used 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.

[0582] [Negative electrode plate] 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.

[0583] It can be optionally 0.001Ω to 0.005Ω. Exemplarily, 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 the range composed of any two of the above values.

[0584] In other examples, the resistance of the negative electrode plate can be in the range of 1mΩ - 50mΩ.

[0585] Thus, when the resistance of the negative electrode plate is in the above range, it is beneficial to reduce the internal resistance of the single-cell battery, improve the conductivity of the battery sub-unit, and then improve the charging rate of the battery sub-unit, which is beneficial to enhancing the fast charging performance of the battery device.

[0586] In the embodiments of the present application, the resistance of the negative electrode plate has the meaning well-known in the art, and can be detected by the equipment and methods well-known in the art. Its detection method is the same as the resistance test method of the positive electrode plate described above.

[0587] In some embodiments, the negative electrode active material includes carbon-based materials, and the carbon-based materials include at least one of natural graphite and artificial graphite. Or the carbon-based materials can also include natural graphite. Specifically, the carbon-based materials can include graphite particles, or the carbon-based materials can include graphite particles and natural graphite.

[0588] Optionally, the carbon-based material is graphite particles. Based on the mass of the graphite particles, the mass ratio of natural graphite can be greater than that of artificial graphite.

[0589] At least one of natural graphite and artificial graphite is used as the carbon-based material of the negative electrode active material layer, and both have good electrical conductivity and a relatively high theoretical specific capacity. Natural graphite has a high crystallinity and a regular layered structure, which is conducive to the rapid insertion and extraction of lithium ions, thereby improving the charge and discharge efficiency of the battery; artificial graphite can precisely adjust its microstructure and performance by controlling the production process, enhance the cycle stability of a single battery cell, and extend the service life of a single battery cell, so that the cycle life and charging stability of the charging device 100 can be extended in the scenario of high-power charging.

[0590] 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.

[0591] In the case where the negative electrode film layer adopts a single-layer film layer, the negative electrode 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 adopting a single-layer film layer, the volume average particle size Dv50 of the negative electrode 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 electrode 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 the range composed of 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 - 18.5 μm. For example, it 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 the range composed of any two of the above values.

[0592] In the case where the negative electrode film layer adopts at least two layers of film layers, the negative electrode active material in the negative electrode film layer includes a carbon-based material, and optionally also includes a silicon-based material. The silicon-based material can be located in one of the at least two layers of film layers, or can be located in at least two of the at least two layers of film layers. The negative electrode film layer can include two layers of film layers, three layers of film layers, four layers of film layers, or even more layers of film layers.

[0593] The volume average particle size Dv50 of the negative electrode film layer is in the range of 8.2 μm to 13.5 μm. This particle size range can balance the specific surface area and the tap density. A smaller particle size can provide a larger specific surface area, increasing the reaction sites for lithium ions and improving the charge-discharge rate performance of the single cell. And an appropriate particle size can have a higher tap density, reducing the voids between the active materials and improving the energy density of the single cell, so that the single cell achieves a better balance in rate performance and energy density to meet the charging requirements of the charging device 100 at different charging rates.

[0594] 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 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 9.5 μm to 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 to 14.3 μm.

[0595] 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 within the above ranges, on the one hand, it can shorten the solid-phase transmission path of lithium ions and improve the fast charging performance. On the other hand, the material is not prone to agglomeration during the preparation process, which can improve the stability of the material. The cooperation of 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 within the above volume average particle size range is beneficial to constructing the 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 fast charging performance of the battery single cell.

[0596] 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 disposed 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 the side of the first negative electrode film layer facing away from the negative electrode current collector. The carbon-based material in the second negative electrode film layer includes graphite particles. 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.

[0597] The interface between the first negative electrode film layer and the second negative electrode film layer can be regular or irregular, and optionally it is irregular.

[0598] Optionally, the carbon-based material in the first negative electrode film layer further includes natural graphite.

[0599] The negative electrode film layer includes at least two film layers, and layered coating is beneficial to improving the fast charging performance of the single cell. Especially when there are differences between the first negative electrode film layer and the second negative electrode film layer, it is possible to construct pore differences in the negative electrode film layer, reduce the tortuosity of lithium ion transport, and improve the fast charging performance of the single cell.

[0600] 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 improving 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.

[0601] The difference in particle size between the first negative electrode film layer and the second negative electrode film layer can improve the fast charging performance of the single cell. Specifically, during fast charging, the overpotential of the second negative electrode film layer is usually relatively high, and the bottleneck of fast charging mainly lies 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 transport path of lithium ions, improve the fast charging performance, and can also improve the problem of lithium deposition on the surface layer of the negative electrode sheet.

[0602] Optionally, the negative electrode active material in the first negative electrode film layer is in granular form, and its volume average particle size Dv50 is from 9.5 μm to 18.5 μm, and can be optionally from 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 the range composed of 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 from 9.5 μm to 18.5 μm, and can be optionally from 9.5 μm to 14.6 μm.

[0603] When the volume average particle size Dv50 of the negative electrode active material in the first negative electrode film layer is within the above range, on the one hand, it can shorten the solid-phase transport path of lithium ions and improve the fast charging performance, and on the other hand, the material is not prone to agglomeration during the preparation process, which can improve the stability of the material.

[0604] Optionally, the negative active material in the second negative electrode film layer is granular, and its volume average particle size Dv50 is from 7.8 μm to 14.3 μm, and may be optionally from 7.8 μm to 11.3 μm. Exemplarily, 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 composed of any two of the above values. When the second negative electrode film layer includes graphite particles, the volume average particle size Dv50 of the graphite particles in the second negative electrode film layer is from 7.8 μm to 14.3 μm, and may be optionally from 7.8 μm to 11.3 μm.

[0605] 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, it can shorten the solid-phase transmission path of lithium ions and improve the fast charging performance. On the other hand, the material is not easily agglomerated during the preparation process, which can improve the stability of the material. On the other hand, the cooperation of the negative active material in the second negative electrode film layer with the volume average particle size range and the negative active material in the first negative electrode film layer is beneficial to constructing the gradient pore difference between the second negative electrode film layer and the first negative electrode film layer, reducing the tortuosity of lithium ion transmission, and improving the fast charging performance of the single cell.

[0606] In the embodiments of the present application, the volume average particle size Dv50 of the negative active material has the meaning well-known in the art, and can be detected by the equipment and methods well-known in the art. Its detection method is the same as the test method for the volume average particle size Dv50 of the positive active material described above.

[0607] Optionally, the tapped density of the carbon-based material in the first negative electrode film layer is less than or equal to the tapped density of the carbon-based material in the second negative electrode film layer. The tapped density can reflect the filling density of the active material in the film layer. When the tapped density of the carbon-based material in the second negative electrode film layer is greater than the tapped density of the carbon-based material in the first negative electrode film layer, the second negative electrode film layer is filled more densely, so that the energy density of the single cell is improved. The filling of the first negative electrode film layer is relatively sparse and the pores are richer, which can improve the fast charging performance of the single cell. When the negative active material includes graphite particles, the tapped density of the graphite particles in the first negative electrode film layer is less than or equal to the tapped density of the graphite particles in the second negative electrode film layer.

[0608] Optionally, the tapped density of the carbon-based material in the first negative electrode film layer is 0.82 g / cm 3To 1.21 g / cm 3 , such as 0.82 g / cm 3 , 0.85 g / cm 3 , 0.88 g / cm 3 , 0.90 g / cm 3 , 0.92 g / cm 3 , 0.95 g / cm 3 , 0.98 g / cm 3 , 1.00 g / cm 3 , 1.05 g / cm 3 , 1.08 g / cm 3 , 1.10 g / cm 3 , 1.12 g / cm 3 , 1.15 g / cm 3 , 1.18 g / cm 3 , 1.20 g / cm 3 , 1.21 g / cm 3 Or a range composed of any two of the above values. When the tap density of the carbon-based material in the first negative electrode film layer is within a suitable range, the fast charging performance of the single-cell battery can be improved.

[0609] Optionally, the tap density of the carbon-based material in the second negative electrode film layer is 0.90 g / cm 3 To 1.25 g / cm 3 , such as 0.90 g / cm 3 , 0.92 g / cm 3 , 0.95 g / cm 3 , 0.98 g / cm 3 , 1.00 g / cm 3 , 1.05 g / cm 3 , 1.08 g / cm 3 , 1.10 g / cm 3 , 1.12 g / cm 3 , 1.15 g / cm 3 , 1.18 g / cm 3 , 1.20 g / cm 3 , 1.21 g / cm 3 , 1.22 g / cm 3 , 1.23 g / cm 3 , 1.24 g / cm 3 ³ , 1.25 g / cm 3 Or a range composed of any two of the above values. When the tap density of the carbon-based material in the second negative electrode film layer is within a suitable range, the energy density of the single-cell battery can be improved.

[0610] In the embodiments of the present application, the tapped density of the material has the meaning well-known in the art and can be measured by instruments and methods known in the art. For example, reference can be made to GB / T5162-2006 and a powder tapped density tester can be used for measurement. The test instrument can be BT-301 produced by Dandong BETTER.

[0611] Optionally, the ratio of the thickness of the second negative electrode film layer to the thickness of the first negative electrode film layer is from 3:7 to 7:3, and can be optionally from 4:6 to 6:4. Exemplarily, 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 composed of 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 fast charging ability of the single cell can be improved.

[0612] In some embodiments, when the single cell is in a 100% charged state, the tap density of the negative electrode film layer is 1.15 g / cm 3 - 1.36 g / cm 3 .

[0613] It can be optionally from 1.25 g / cm 3 to 1.36 g / cm 3 . Exemplarily, when the single cell is in a 100% charged state, the tap density of the negative electrode film layer 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 composed of any two of the above values.

[0614] In the embodiments of the present application, when the single cell is in a 100% charged state, the tap density of the negative electrode film layer has the meaning well-known in the art and can be detected by equipment and methods well-known in the art. The detection method is the same as the tap density test method of the positive electrode film layer described above.

[0615] When the tap density of the negative electrode film layer is within the above range, it is beneficial to improve the energy density of the battery cell, and since the negative active materials in the negative electrode film layer are stacked relatively tightly and the contact resistance between particles is small, the resistance of the electrode sheet can be further reduced, thereby reducing heat generation.

[0616] In some embodiments, the powder compaction density of the negative electrode active material under a pressure of 20,000 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 . Exemplarily, the powder compaction density of the negative electrode active material under a pressure of 20,000 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 composed of any two of the above values.

[0617] When the powder compaction density of the negative electrode active material under 20,000 N is within the above range, the energy density of the single cell can be improved. Moreover, since the negative electrode active material in the negative electrode film layer can be stacked more closely and the contact resistance between particles is small, the resistance of the electrode sheet can be further reduced, thereby reducing heat generation.

[0618] In the embodiments of the present application, the powder compaction density of the material has the meaning well known in the art and can be detected by the methods and equipment well known in the art, and is detected according to the test standard GB / T24533-2009. As an example, a certain amount of the negative electrode active material is taken as a sample and added to a mold with a bottom area of 1.327 cm 2² in a UTM7305 type electronic pressure testing machine, pressurized to 2000 kg (equivalent to 20,000 N), held for 30 s, then depressurized, held for 10 s, and then the powder compaction density of the negative electrode active material under a force of 20,000 N is recorded and calculated.

[0619] In some embodiments, the charging specific capacity of the negative electrode active material at a 0.1C rate is 350 mAh / g to 480 mAh / g. Exemplarily, the charging specific capacity of the negative electrode 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 composed of any two of the above values.

[0620] When the charging specific capacity of the negative electrode active material at a rate of 0.1C is within the above range, the energy density of the single cell is relatively high.

[0621] In the embodiments of the present application, the charging specific capacity of the negative electrode active material at a rate of 0.1C has the meaning well-known in the art, and can be detected by using the equipment and methods well-known in the art. The detection method is the same as the charging specific capacity test method of the positive electrode active material at a rate of 0.1C described above.

[0622] In some embodiments, the negative electrode active material layer includes a carbon-based material, and the carbon-based material has high cycle stability and can improve the cycle performance of the single cell. Optionally, the mass ratio of the carbon-based material in the negative electrode active material can be greater than or equal to 80% and less than or equal to 100%.

[0623] The positive electrode active material of the present application is mainly a lithium-containing phosphate system with an olivine structure, and the negative electrode active material is mainly a carbon-based material system. When the two are used in combination, the cycle performance of the single cell is relatively excellent.

[0624] Optionally, the carbon-based material includes graphite particles, and the graphitization degree of the graphite particles is 92.0% to 94.5%. Exemplarily, the graphitization degree of the graphite particles is 92.0%, 92.5%, 93%, 93.5%, 94%, 94.5% or the range composed of any two of the above values.

[0625] When the graphitization degree of the graphite particles is within the above range, the electrical conductivity of the graphite particles is relatively excellent, which can reduce the heat generation of the negative electrode sheet and the single cell, and can improve the fast charging performance of the single cell.

[0626] In some embodiments, the graphite particles include artificial graphite and a carbon coating layer. The artificial graphite includes secondary particles, and the secondary particles include a plurality of primary particles. The carbon coating layer covers the surface of the artificial graphite. The carbon in the carbon coating layer is mainly amorphous carbon. Amorphous carbon refers to a transition carbon material with a very low degree of graphitization crystallization and an approximate amorphous form (or no fixed shape and periodic structural rules). In the present application, amorphous carbon refers to the product after carbonization treatment of an organic carbon source.

[0627] The artificial graphite includes secondary particles. In the artificial graphite, there are more migration paths for lithium ions, 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, which increases the number of sites where lithium ions can be intercalated and deintercalated, making the electrical conductivity of the carbon coating layer relatively excellent, and can reduce the internal resistance of the negative electrode sheet and the heat generation of the single cell.

[0628] Optionally, based on the mass of the graphite particles, the mass content of the carbon coating layer is 2% to 5%. Exemplarily, the mass content of the carbon coating layer is 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% or a range composed of any two of the above values.

[0629] When the mass content of the carbon coating layer is within the above range, the internal resistance of the negative electrode sheet can be further reduced, and the heat generation of the single cell can be reduced.

[0630] In the embodiments of the present application, the graphite particles can be prepared by methods well 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.

[0631] 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.

[0632] 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 a suitable 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.

[0633] Optionally, the carbonization treatment time is 1h to 6h.

[0634] In some embodiments, the negative electrode active material may further include a silicon-based material. The introduction of the silicon-based material can increase the capacity of the negative electrode active material and improve the energy density of the single cell.

[0635] Optionally, based on the mass of the negative electrode active material, the mass content of silicon element in the silicon-based material is 0.3% to 10.0%, and can be optionally 1% to 6%. Exemplarily, the mass content of silicon element 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 composed of any two of the above values.

[0636] When the mass content of silicon element in the silicon-based material is within the above range, the capacity of the negative electrode active material can be increased, and the energy density of the single cell can be improved.

[0637] Optionally, the silicon-based material may include at least one of elemental silicon, silicon oxide, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy material.

[0638] In some embodiments, in addition to the above-mentioned carbon-based material and optional silicon-based material, the negative electrode active material may further include at least one of a tin-based material and lithium titanate. The tin-based material may include at least one of elemental tin, tin oxide, and tin alloy material.

[0639] In the present application, the qualitative and quantitative determination of each substance or element can be detected by suitable equipment and methods known to those skilled in the art. 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 some detection steps / instrument parameters, etc. 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 in combination for qualitative or quantitative determination.

[0640] For example, the present application can combine the general rules of X-ray diffraction analysis method of JIS / K0131-1996 to perform X-ray powder diffraction test and qualitative analysis on the negative electrode sheet or the negative electrode active material.

[0641] Artificial graphite and natural graphite can be distinguished by the SEM cross-sectional view taken by scanning electron microscope (SEM). There are voids between the flaky structures in the SEM cross-sectional view of natural graphite, and the SEM cross-sectional view of artificial graphite is dense and has no obvious gaps, or can be distinguished by the XRD spectrum obtained by X-ray diffraction method. There are obvious 2H phase and 3R phase in the XRD spectrum of natural graphite, and only 2H phase exists in the XRD spectrum of artificial graphite.

[0642] In some embodiments, the powder resistivity of the negative electrode active material is 0.005 Ω•cm to 0.043 Ω•cm, and optionally 0.04 Ω•cm. Exemplarily, the powder resistivity of the negative electrode 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 the range composed of any two of the above values.

[0643] The relatively low powder resistivity of the negative electrode active material results in a relatively low resistance of the negative electrode sheet and less heat generation of the single cell.

[0644] In the embodiments of the present application, the powder resistivity of the negative electrode active material has the meaning well-known in the art and can be detected by the equipment and methods well-known in the art. Its detection method is the same as the powder resistivity test method of the positive electrode active material described above.

[0645] In some embodiments, after the monomer cell undergoes 10 full charge test cycles at the beginning of life (BOL), the thickness of the first negative electrode film layer is 15 μm to 65 μm, such as 15 μm, 17 μm, 18 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 57 μm, 58 μm, 60 μm, 61 μm, 62 μm, 63 μm, 64 μm, 65 μm or the range composed of any two of the above values. When the thickness of the first negative electrode film layer is within the above range, the gradient pore difference between the first negative electrode film layer and the second negative electrode film layer can be increased, the tortuosity of lithium ion transmission can be reduced, and the fast charging ability of the monomer cell can be improved.

[0646] In some embodiments, after the monomer cell undergoes 10 full charge test cycles at the beginning of life (BOL), the thickness of the second negative electrode film layer is 15 μm to 65 μm, such as 15 μm, 17 μm, 18 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 57 μm, 58 μm, 60 μm, 61 μm, 62 μm, 63 μm, 64 μm, 65 μm or the range composed of any two of the above values. When the thickness of the second negative electrode film layer is within the above range, the gradient pore difference between the first negative electrode film layer and the second negative electrode film layer can be increased, the tortuosity of lithium ion transmission can be reduced, and the fast charging ability of the monomer cell can be improved.

[0647] In the embodiments of the present application, for example, taking the upper limit voltage of battery charging as 3.65 V and the cut-off voltage of battery discharging as 2.0 V as an example for illustration, The specific steps of the BOL full charge test are as follows: At 25°C, charge at a charging rate of 0.33C of the battery nominal capacity to 3.65 V, then charge at a constant voltage of 3.65 V to 0.05C, stand for 10 min, then discharge at a discharging rate of 0.33C to 2.0 V, stand for 10 min. The above one charge and discharge is one cycle, and cycle 10 times. Then charge at a charging rate of 0.33C of the nominal capacity to 3.65 V, and then charge at a constant voltage of 3.65 V to 0.05C to obtain the BOL full charge state. In the BOL full charge state, disassemble the negative electrode plate, use a tomography electron microscope to observe the cross-section in the thickness direction of the middle area of the negative electrode plate, distinguish the two regions according to the interface between the first negative electrode film layer and the second negative electrode film layer, and measure the thicknesses of the two respectively. For example, measure the thicknesses of 10 positions of the first negative electrode film layer, calculate their average value as the average thickness of the first negative electrode film layer, measure the thicknesses of 10 positions of the second negative electrode film layer, and calculate their average value as the average thickness of the second negative electrode film layer.

[0648] In some embodiments, after the full charge test at the end of life (EOL) of the single cell, 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, 70 μm or the range composed of any two of the above values. When the thickness of the first negative electrode film layer is within the above range, the gradient pore difference between the first negative electrode film layer and the second negative electrode film layer can be increased, the tortuosity of lithium ion transport can be reduced, and the fast charging ability of the single cell can be improved.

[0649] In some embodiments, after the full charge test at the end of life (EOL) of the single cell, 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, 70 μm or the range composed of any two of the above values. When the thickness of the second negative electrode film layer is within the above range, the gradient pore difference between the first negative electrode film layer and the second negative electrode film layer can be increased, the tortuosity of lithium ion transport can be reduced, and the fast charging ability of the single cell can be improved.

[0650] In the embodiments of the present application, for example, the upper limit voltage of battery charging is taken as 3.65 V and the cut-off voltage of battery discharging is taken as 2.0 V for illustration.

[0651] The specific steps for the EOL full charge test are as follows: At 60 °C, charge at a charging rate of 0.33C of the battery's nominal capacity until 3.65V, then perform constant voltage charging at 3.65V until 0.05C, let it stand for 10 minutes, then discharge at a discharge rate of 0.33C until 2.0V, and let it stand for 10 minutes. The above one charge and discharge cycle is repeated until the battery capacity decays to 80% of the nominal capacity and the test stops. Then, at 25 °C, charge at a constant current of 0.33C until 3.65V, and perform constant voltage charging at a rate of 0.05C until 3.65V, which is the EOL full charge state. In the EOL full charge state, disassemble the negative electrode sheet, use a tomography scanning electron microscope to observe the cross-section in the thickness direction of the middle area of the negative electrode sheet, distinguish the regions of the first negative electrode film layer and the second negative electrode film layer according to their interfaces, and measure their thicknesses respectively. For example, measure the thicknesses at 10 positions of the first negative electrode film layer, calculate their average value as the average thickness of the first negative electrode film layer, measure the thicknesses at 10 positions of the second negative electrode film layer, and calculate their average value as the average thickness of the second negative electrode film layer.

[0652] In some embodiments, when the negative electrode film layer adopts a single-layer film layer (different from the above-mentioned double-layer film layer), the negative electrode film layer further includes a lithium-containing binder. Optionally, the mass content of the lithium-containing binder relative to the mass of the negative electrode film layer is 0.1% to 1%. Exemplarily, the mass content of the lithium-containing binder relative to the mass of 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 values. The lithium element in the lithium-containing binder can exist in ionic form, which can increase the number of freely moving lithium ions in the negative electrode film layer, shorten the distance for lithium ions to diffuse to the surface of the negative electrode film layer, increase the lithium ion insertion / extraction rate, and improve the fast charging performance of the single-cell battery. Optionally, the negative electrode film layer can further include a negative electrode binder. For example, the negative electrode binder includes at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (such as polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS).

[0653] Optionally, the mass content of lithium element in the lithium-containing binder is 3% to 10%. Exemplarily, 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 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 within the above range, the number of freely moving lithium ions in the negative electrode film layer can be relatively large, which can further shorten the distance for lithium ions to diffuse to the surface of the negative electrode film layer, increase the lithium ion insertion / extraction rate, and improve the fast charging performance of the single-cell battery.

[0654] Exemplarily, the lithium-containing binder includes a lithium acrylate-acrylonitrile-acrylamide-2-hydroxyethyl acrylate copolymer, which is derived from lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and 2-hydroxyethyl acrylate monomer, and the molar ratio of the lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and 2-hydroxyethyl acrylate monomer is 30% to 50%: 15% to 45%: 5% to 20%: 20% to 35%. For example, the molar ratio of the lithium acrylate monomer, acrylonitrile monomer, acrylamide monomer, and 2-hydroxyethyl acrylate monomer is 35%: 30%: 15%: 20%, or 40%: 20%: 10%: 30%, or 45%: 15%: 20%: 20%, etc.

[0655] The lithium-containing binder of the above materials can provide a certain amount of lithium ions for the negative electrode film layer, improve the fast charging performance of the single cell, and is not prone to swelling during the charge and discharge process, with a stable structure, so that the cycle performance of the negative electrode film layer is improved during the fast charge and discharge process.

[0656] In some other embodiments, when the negative electrode film layer adopts at least two layers of film layers, the negative electrode film layer further includes a lithium-containing binder.

[0657] Optionally, the first negative electrode film layer further includes a first lithium-containing binder, and the second negative electrode film layer further includes 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.

[0658] 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 larger number of freely movable lithium ions for the second negative electrode film layer, which can further improve the fast charging performance of the single cell.

[0659] 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 the range composed of 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 for lithium ions to diffuse to the surface of the negative electrode film layer, increase the deintercalation rate of lithium ions, and improve the fast charging performance of the single cell.

[0660] Optionally, the mass content of lithium element in the first lithium-containing binder is 3% to 10%, and can be optionally 3% to 8%. Exemplarily, the mass content of lithium element in the first lithium-containing binder is 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% or the range composed of any two of the above values. When the mass content of lithium element is within the above range, the number of free-moving lithium ions in the negative electrode film layer can be relatively large, which can further shorten the distance for lithium ions to diffuse to the surface of the negative electrode film layer, improve the insertion and extraction rate of lithium ions, and improve the fast charging performance of the single-cell battery.

[0661] Exemplarily, the first lithium-containing binder includes a lithium acrylate-acrylonitrile-acrylamide-2-hydroxyethyl acrylate copolymer, and the lithium acrylate-acrylonitrile-acrylamide-2-hydroxyethyl acrylate copolymer is derived from a lithium acrylate monomer, an acrylonitrile monomer, an acrylamide monomer, and a 2-hydroxyethyl acrylate monomer. The molar ratio of the lithium acrylate monomer, the acrylonitrile monomer, the acrylamide monomer, and the 2-hydroxyethyl acrylate monomer is 30% to 50%: 15% to 45%: 5% to 20%: 20% to 35%. For example, the molar ratio of the lithium acrylate monomer, the acrylonitrile monomer, the acrylamide monomer, and the 2-hydroxyethyl acrylate monomer is 35%: 30%: 15%: 20%, or 40%: 20%: 10%: 30%, or 45%: 15%: 20%: 20%, etc.

[0662] The lithium-containing binder of the above material can provide a certain number of lithium ions for the negative electrode film layer, improve the fast charging performance of the single-cell battery, and is not prone to swelling during the charge and discharge process, with a stable structure, so that the cycle performance of the negative electrode film layer is improved during the fast charge and discharge process.

[0663] 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%. Exemplarily, 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 the range composed of 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 free-moving lithium ions in the negative electrode film layer, shorten the distance for lithium ions t...

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 used to: Determining charging requirement information of the battery device, where the charging requirement information is used to indicate the charging required 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 requirement 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.

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, characterized in that: 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, 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 first charging requirement power. When the charging mode information includes second charging mode information, the charging requirement power includes second charging requirement power. Among them, the first charging required power is greater than the second charging required 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; 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 charged independently 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 energy storage device includes one or more energy storage modules, the energy storage module includes one or more energy storage units, each of the energy storage units has a first positive power supply terminal and a first negative power supply terminal, 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 through 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 also includes a charging module, which is connected to the second positive power supply terminal and the second negative power supply terminal 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.

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 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.

14. The charging device according to claim 12, characterized in that: Each of the energy storage units 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, wherein 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), wherein 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 Wh / L.

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, characterized in that: 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, characterized in that: The electrolyte further includes an organic solvent, and the organic solvent includes a chain carboxylic acid ester solvent. Based on the total mass of the solvent, the mass content A of the chain carboxylic acid ester solvent satisfies: 5%≤A≤75%, Wherein, the chain carboxylate solvent includes compounds with the following structures: 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, characterized in that: Each of the energy storage units includes a battery subunit, each of which includes a single battery cell, each of which includes a negative electrode plate, each of which includes a negative electrode collector and a negative electrode film layer disposed on at least one side of the negative electrode collector, each of which includes a negative electrode active material, each of which includes a carbon-based material, and each of which 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 stacked, 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 comprises a battery subunit, wherein the battery subunit comprises a single cell, wherein the single cell comprises a negative electrode plate, wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer at least located on one side of the negative electrode current collector, wherein the negative electrode film layer comprises a negative electrode active material; The compaction density of the negative electrode film layer of the single cell is 1.15 g / 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 at least located 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 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 cell, the single cell includes a positive electrode plate, the positive electrode plate includes a positive current collector and a positive electrode film layer located at least on one side of the positive current collector, and the thickness of the positive current 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, the battery subunit includes a single battery cell, the single battery cell includes a separation membrane, the separation membrane includes a base membrane with a porous structure, and 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 comprises a battery subunit, wherein the battery subunit comprises a positive electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film layer disposed on at least one side of the positive electrode current collector, wherein the positive electrode film layer comprises a positive electrode active material, wherein the positive electrode active material comprises 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 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, characterized in that: Each of the energy storage units comprises a battery subunit, the battery subunit comprises a positive electrode sheet, the positive electrode sheet comprises a positive current collector, a positive conductive layer and a positive film layer, the positive film layer is arranged on at least one side of the positive current collector, the positive conductive layer is located between the positive current collector and the positive film layer, and the thickness of the positive 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, and the negative electrode plate includes a negative electrode 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 collector, and the negative electrode conductive layer is located between the negative electrode 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, and 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%-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 includes an energy storage device, the charging device is configured to charge a battery device through the energy storage device, and the charging method includes: Determining charging requirement information of the battery device, where the charging requirement information is used to indicate the charging required 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 requirement information; The battery device is charged according to the charging parameter, and the charging power corresponding to the charging parameter 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, characterized in that: 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 first charging requirement power. When the charging mode information includes second charging mode information, the charging requirement power includes second charging requirement power. Among them, the first charging required power is greater than the second charging required power.

38. The charging method according to claim 37, 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.

39. The charging method according to claim 37, 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.

40. The charging method according to claim 37, characterized in that: When the charging mode information includes the first charging mode information, the charging power includes a first charging power; 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.

41. The charging method according to claim 37, characterized in that: 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 comprises: 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, wherein 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 comprises: When the charging operation matches the charging quantity 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 is configured to charge the energy storage device via input power, the power conversion device includes 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 discharging 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 charged independently by the power conversion device.

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