Low-temperature slow charging control method and device and vehicle

Abstract

The application discloses a low-temperature slow charging control method and device and a vehicle, relates to the technical field of battery charging, and discloses a low-temperature slow charging control method, which comprises the following steps: acquiring temperature rise data of a battery pack; acquiring available charging power of the battery pack based on the temperature rise data of the battery pack; confirming a power distribution point based on the available charging power; and distributing power for charging of the battery pack by a charging pile based on the power distribution point. The heating power required by the battery pack in a low-temperature environment is acquired through the temperature rise data of the battery pack; and the available charging power of the battery pack is acquired in combination with the maximum power that can be provided by the charging pile. The heating requirement and bearing capacity of the battery pack are comprehensively considered based on the available charging power of the battery pack and the maximum acceptable charging power of the battery pack, and the power distribution point is confirmed. The power distribution point can realize the distribution of the heating power and the charging power of the maximum utilization of energy, and improves the charging rate to solve the distribution problem.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery charging, in particular to a low-temperature slow charging control method and device and a vehicle. BACKGROUND

[0002] The winter in low-temperature regions such as the Northeast and Northwest regions is extremely cold and lasts for a long time, and the access amount of new energy vehicles is far less than that in other regions. This shows that low temperature still has a certain impact on the purchase intention of consumers, and the low-temperature resistance technology of vehicles needs to be further broken through. Improving the user experience of electric vehicles in cold regions is a key problem restricting the promotion of electric vehicles, which includes two technologies that need to be improved, namely, improving the range attenuation and improving the low-temperature charging speed.

[0003] In the underdeveloped northern region of fast charging stations, slow charging is a relatively easy and popular power supplement method. However, the ambient temperature is low, and the charging power of the battery is limited due to its physical and chemical characteristics, for example, a small car equipped with a lithium battery at present, at a low temperature of minus 20 degrees Celsius, the charging power limit may be lower than 0.5kW, which will cause the charging time to be too long. Therefore, the battery pack starts the heating system at low temperature to improve the battery temperature so as to improve the charging power permitted by the battery itself. The common heating system is to heat the battery module by using a thermistor or to heat the circulating water by using a thermistor, and then the circulating water heats the battery module. When the heating is started during charging, the heating system will consume the energy provided by the charging pile.

[0004] The slow charging power is usually 3.3kW or 6.6kW standard power, and the high-power slow charging 11kW is very rare even in the south, and it is more difficult to find in the north. 3.3kW is a common charging pile in the northern region. Therefore, in the case of limited charging pile power, how to allocate the battery pack heating and the battery pack charging is an important problem to be solved. SUMMARY

[0005] The main purpose of the present application is to provide a low-temperature slow charging control method, device and vehicle, which aims to solve the technical problem of slow charging and low utilization caused by poor power allocation in the prior art under low-temperature environment.

[0006] To achieve the above-mentioned purpose, the present application provides a low-temperature slow charging control method, which comprises: obtaining temperature rise data of a battery pack; obtaining available charging power of the battery pack based on the temperature rise data of the battery pack; confirming a power distribution point based on the available charging power; and distributing the power of a charging pile for charging the battery pack based on the power distribution point.

[0007] In an embodiment, the step of obtaining the temperature rise data of the battery pack under heating includes: obtaining a heat conduction parameter of the battery pack; obtaining a preset heating power for the battery pack to reach a preset target temperature based on the heat conduction parameter of the battery pack; and obtaining the temperature rise data of the battery pack under heating based on the preset heating power.

[0008] In an embodiment, the step of obtaining the available charging power of the battery pack based on the temperature rise data of the battery pack includes: obtaining a rated power of the charging pile; obtaining a remaining power of the charging pile based on the rated power of the charging pile and the temperature rise data of the battery pack; and obtaining the available charging power of the battery pack based on the remaining power of the charging pile.

[0009] In an embodiment, the step of confirming the power distribution point based on the available charging power includes: obtaining a maximum allowable charging power of the battery pack; obtaining a correspondence between the maximum allowable charging power and the available charging power based on a mapping of the available charging power of the battery pack to the maximum allowable charging power; and selecting an intersection point of the maximum allowable charging power and the available charging power as the power distribution point based on the correspondence.

[0010] In an embodiment, the step of confirming the power distribution point based on the available charging power further includes: obtaining a self-heating power of the battery pack based on the available charging power of the battery pack; correcting the temperature rise data of the battery pack based on the self-heating power of the battery pack; confirming a corrected power distribution point based on the corrected temperature rise data of the battery pack; and distributing the power of the charging pile for charging the battery pack based on the corrected power distribution point.

[0011] In an embodiment, the step of obtaining the self-heating power of the battery pack based on the available charging power of the battery pack includes: obtaining a charging current based on the available charging power of the battery pack; obtaining rated data of the battery pack; and obtaining the self-heating power of the battery pack based on the charging current and the rated data.

[0012] In addition, to achieve the above object, the present application also provides a low-temperature slow charging control device, which comprises: a data acquisition module, configured to obtain temperature rise data of a battery pack; further configured to obtain available charging power of the battery pack based on the temperature rise data of the battery pack; and further configured to confirm a power distribution point based on the available charging power; and a control module, configured to distribute power of a charging pile for charging the battery pack based on the power distribution point.

[0013] In addition, to achieve the above object, the present application also provides a vehicle, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the low-temperature slow charging control method as described above.

[0014] In addition, to achieve the above object, the present application also provides a storage medium, which is a computer readable storage medium, and a computer program is stored on the storage medium. The computer program is executed by a processor to implement the steps of the low-temperature slow charging control method.

[0015] In addition, to achieve the above object, the present application also provides a computer program product, which comprises a computer program. The computer program is executed by a processor to implement the steps of the low-temperature slow charging control method.

[0016] The one or more technical solutions provided by the present application have at least the following technical effects:

[0017] The heating power required by the battery pack in a low-temperature environment is obtained through the temperature rise data of the battery pack. In combination with the maximum power that can be provided by the charging pile, the available charging power of the battery pack is obtained. Based on the available charging power of the battery pack and the maximum acceptable charging power of the battery pack, the heating demand and the bearing capacity of the battery pack are comprehensively considered to confirm the power distribution point. The power distribution point can realize the distribution of the heating power and the charging power that maximizes the utilization of energy, and improves the charging rate to solve the distribution problem. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0020] Figure 1 A flowchart is provided for the low-temperature slow charging control method embodiment one of the present application;

[0021] Figure 2 A diagrammatic illustration is provided for the low-temperature slow charging control method embodiment one of the present application;

[0022] Figure 3 A flowchart is provided for the low-temperature slow charging control method embodiment two of the present application;

[0023] Figure 4 A diagrammatic illustration is provided for the low-temperature slow charging control method embodiment two of the present application;

[0024] Figure 5 Another diagrammatic illustration is provided for the low-temperature slow charging control method embodiment two of the present application;

[0025] Figure 6 A module structure schematic diagram of a low-temperature slow charging control device of an embodiment of the present application is shown in FIG. 1.

[0026] Figure 7 A device structure schematic diagram of a hardware running environment involved in a low-temperature slow charging control method of an embodiment of the present application is shown in FIG. 2.

[0027] The object implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are merely intended to explain the technical solutions of the present application, and are not intended to limit the present application.

[0029] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the drawings and specific embodiments of the specification.

[0030] The common solution in the prior art is calibration, that is, at different low temperatures, the temperature point or heating time is found through calibration, a fixed threshold of heating target higher than the ambient temperature is set, or the time is periodically cycled for heating, or a maximum power of the self-heater is set for timing heating, etc.

[0031] It can be understood that, since the slow charging pile power is always limited, if the power consumed for heating is large, the power for charging the battery pack will be small, resulting in slow charging speed; if the power for charging is large, the power for heating will be small, and the battery pack may be cooled down, further limiting the charging power, and also resulting in slow charging speed. The technical problem of slow charging speed due to slow charging power limitation and poor power distribution in a low-temperature environment still needs to be faced.

[0032] Based on this, an embodiment of the present application provides a low-temperature slow charging control method, which is described in detail with reference to Figure 1 , Figure 1 A flowchart of a first embodiment of a low-temperature slow charging control method of the present application is shown in FIG. 3.

[0033] It should be noted that the execution subject of the present embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, a vehicle, etc. capable of realizing the above functions. The present embodiment and the following embodiments will be described taking a vehicle as an example.

[0034] In the present embodiment, the low-temperature slow charging control method includes steps S10 to S40:

[0035] Step S10, obtaining temperature rise data of the battery pack.

[0036] It should be noted that the temperature rise data of the battery pack generally refers to the temperature rise value of the battery pack relative to the ambient temperature during operation. This data is one of the important indicators for evaluating the thermal management performance, safety and service life of the battery pack.

[0037] It can be understood that in the low-temperature slow-charging environment faced by the present solution, the temperature rise data of the battery pack often depends on the distribution of heating power. The greater the heating power, the faster the temperature rise rate of the battery pack is generally. This is because more heat is input into the battery pack, causing the temperature to rise rapidly. Therefore, in the present application, the temperature rise data of the battery pack refers to the temperature rise data corresponding to the change of heating power, i.e. the heating power corresponding to the stable temperature at each temperature point.

[0038] In a feasible implementation, the present application provides a method for obtaining the temperature rise data corresponding to the change of heating power, as follows: obtaining the thermal conductivity parameter of the battery pack; based on the thermal conductivity parameter of the battery pack, obtaining a preset heating power for the battery pack temperature to reach a preset target temperature; based on the preset heating power, obtaining the temperature rise data of the battery pack.

[0039] It can be understood that the thermal conductivity parameter generally includes thermal conductivity coefficient, also known as thermal conductivity, specific heat capacity, etc., which describes the performance of the material in the process of heat conduction.

[0040] It should be noted that special thermal conductivity measuring instruments such as hot-wire method, laser flash method, etc. can be used to directly measure the thermal conductivity coefficient of the battery pack or key materials therein. It should be noted that these methods usually require the destruction of the battery pack to obtain test samples. The thermal conductivity coefficient can also be calculated by measuring the temperature change of the battery pack under certain conditions, combined with the heat transfer equation. For example, by measuring the temperature change and time of the battery pack during heating or cooling, as well as the size and mass of the battery, etc., the thermal conductivity coefficient can be calculated using the concepts of thermal resistance and heat capacity. The physical properties of the battery pack shell design need to be considered.

[0041] It should be noted that the target temperature that the battery pack needs to reach is selected as the preset target temperature for calculating the preset heating power. According to the principle of thermodynamics, the heat Q required for the battery pack to rise from the current temperature to the target temperature is calculated. In order to estimate the required heating power, we need to consider the heating time and heating efficiency. The heating power P can be calculated by the following formula: P = Q / (t x η).

[0042] Where P is the heating power (W), Q is the required heat (J), and t is the heating time (s). In practical applications, the heating efficiency is usually not 100%, so an efficiency factor η needs to be introduced to correct the heating power.

[0043] It can be understood that the heating process of the battery pack is a complex heat transfer process involving heat conduction, convection and radiation and other heat transfer modes. Therefore, when calculating the heating power, the heat transfer process inside the battery pack and the heat dissipation conditions of the external environment also need to be considered.

[0044] It should be noted that based on the preset heating power, the temperature rise data of the heated battery pack can be obtained by fitting, real-time monitoring of temperature change under heating power change condition, and finally selecting a suitable fitting model for fitting, that is, the heating power corresponding to each temperature point when stable, that is, the temperature rise data.

[0045] Specifically, assuming that the rated power of the charging pile is 3.3kW, taking the initial environment temperature of the battery pack at-20 degrees Celsius as an example, when the battery pack temperature is heated from-20 degrees Celsius, the heating power corresponding to each temperature point when stable is the balance between the battery heating power and the heat exchange loss power of the battery pack and the environment. Under the condition of certain conduction and heat exchange coefficient, it basically shows a linear relationship.

[0046] It can be understood that since it is a linear relationship, when the battery pack is charging, the full power of the charging pile is used for heating, from the initial temperature of-20 degrees Celsius to a stable temperature point. According to the thermal conductivity coefficient of the battery pack and the physical characteristics of the shell design, the 3.3kW heating power can make the battery maintain around-10 degrees Celsius. Referring to Figure 2 , Figure 2 The diagrammatical schematic diagram provided for the first embodiment of the low-temperature slow charging control method of the application, the-10 degrees Celsius point of 3.3kW and the original starting point get the heating temperature-power consumption line, that is, the temperature rise data of the battery pack.

[0047] It is worth noting that since 3.3kW is the maximum power that the charging pile can provide, the balance temperature point that can be maintained by 3.3kW heating power is the maximum heating power temperature point. If it exceeds this point to the right, it means that the battery pack heating power consumption exceeds the power provided by the charging pile, and the internal power of the battery pack will be consumed intensively.

[0048] Step S20, based on the temperature rise data of the battery pack, obtaining the charging available power of the battery pack.

[0049] It should be noted that the charging available power, that is, the charging power that the battery pack can accept, is limited by the output power of the charging pile and the necessary heating power in the low-temperature environment.

[0050] In an implementable embodiment, the present scheme provides a method for obtaining the chargeable power of the battery pack, as follows: obtaining the rated power of the charging pile; obtaining the residual power of the charging pile based on the rated power of the charging pile and the temperature rise data of the battery pack; and obtaining the chargeable power of the battery pack based on the residual power of the charging pile.

[0051] It can be understood that the rated power of the charging pile varies due to the differences in the type, design and technical parameters of the charging pile. An AC charging pile generally uses a 220V single-phase power supply, and its maximum power is usually between 3.3kW and 7kW. Such a charging pile is mainly used for home charging scenarios, and the charging speed is relatively slow, but it is suitable for charging at night or when the vehicle is parked for a long time.

[0052] It should be noted that the rated power of the charging pile can be obtained by the vehicle detecting pile signaling. The charging pile and the vehicle exchange information through specific communication protocols. These protocols usually include the charging control pilot (CP) signal and other related communication protocols (such as ISO 15118, GB / T 27930, etc.). Through these protocols, the vehicle can obtain the power supply capacity and charging parameters of the charging pile, so as to determine whether to start charging and the specific parameters during the charging process.

[0053] It should be noted that the residual power of the charging pile is obtained by subtracting the heating power in the temperature rise data of the battery pack from the rated power of the charging pile.

[0054] It should be noted that the chargeable power of the battery pack, in an ideal case, can be close to or equal to the residual power of the charging pile if the residual power of the charging pile is large enough and the battery pack is in an acceptable charging state.

[0055] Specifically, based on the above assumptions, referring to Figure 2 The chargeable power is obtained by subtracting the heating power value of the heating temperature-power consumption line from the rated power 3.3kW of the charging pile, which refers to the remaining charging power of the pile when heated to each temperature point.

[0056] In step S30, the power distribution point is confirmed based on the chargeable power.

[0057] It should be noted that the power distribution point is the proportion of the rated power of the charging pile allocated as heating power and charging power. For the charging power of the battery pack, it is limited by the chargeable power, so keeping the charging power as the chargeable power is the best energy utilization position. Therefore, confirming the power distribution point based on the chargeable power can achieve the best efficiency.

[0058] It can be understood that the heating power required to maintain the battery pack within the appropriate working temperature range is calculated according to the temperature of the battery pack and the manufacturer's recommendations. Under the limitation of the charging pile rated power and the charging available power, the power actually available for charging is determined. The charging power is kept equal to the charging available power to achieve the best use of energy. According to the determination results of the heating power requirement and the charging power, the power distribution point is calculated.

[0059] In a feasible implementation, the scheme provides a method for confirming the power distribution point based on the charging available power, as follows: obtaining the maximum allowable charging power of the battery pack; mapping the charging available power of the battery pack based on the maximum allowable charging power to obtain the correspondence between the maximum allowable charging power and the charging available power; and selecting the intersection point of the maximum allowable charging power and the charging available power as the power distribution point based on the correspondence.

[0060] It should be noted that the maximum allowable charging power of the battery pack represents the maximum charging power line of the battery due to the physical and chemical property limitations of the battery. Specifically, for example, with reference to Figure 2 When the battery temperature is lower than -24 degrees Celsius, only heating is allowed, and the battery pack cannot be used for charging at this time. This feature interval is the heating zone. If the battery temperature rises, the maximum allowable charging power also rises. When the battery temperature is -6 degrees Celsius, the battery pack allows charging power equal to the maximum power of the pile, and the power of the pile can be fully used for charging. In the interval of -24 degrees Celsius to -6 degrees Celsius, the power provided by the charging pile is greater than the allowable charging power of the battery pack. In this section, the energy of the charging pile can be allocated to a part of the battery pack for heating, thereby improving the charging speed. If the battery temperature continues to rise, the maximum allowable charging power of the battery will continue to rise and will exceed the multiple of the slow charging pile that can be provided. Typically, between 25 degrees Celsius and 35 degrees Celsius, the allowable charging power reaches a peak, and when the temperature exceeds 40 degrees Celsius, the allowable charging rate will rapidly decrease in order to prevent further temperature rise from damaging the battery. Therefore, the relationship curve between the entire battery allowable charging power and the battery temperature is as shown in Figure 2 The relationship curve between the maximum allowable charging power of the battery and the battery temperature is obtained from the test data provided by the battery manufacturer according to the charging characteristics of the battery module.

[0061] It should be noted that the mapping of the charging available power of the battery pack based on the maximum allowable charging power is reflected in the graph according to the temperature of the battery pack, with the horizontal coordinate being the temperature of the battery pack and the vertical coordinate being the one-to-one correspondence, i.e., the correspondence between the maximum allowable charging power and the charging available power.

[0062] It should be noted that the intersection point of the maximum allowable charging power and the charging available power is selected as the power allocation point. In an ideal case, this intersection point represents the optimal state of the battery pack at a specific temperature, which can be safely charged and fully utilize the charging power. If the two curves intersect, the intersection point is selected as the power allocation point. If the two curves do not directly intersect, but have a certain overlapping area, a suitable point in the overlapping area needs to be selected as the power allocation point according to the charging strategy and safety considerations.

[0063] Specifically, referring to Figure 2 , the intersection point is the intersection point of the maximum allowable charging power curve and the charging available power curve on the image.

[0064] Step S40, based on the power allocation point, allocating the charging power for the battery pack to charge.

[0065] It should be noted that once the power allocation point is determined, the vehicle calculates the charging power that should be allocated to the battery pack according to this point. This power value should not exceed the maximum allowable charging power of the battery pack, nor the rated power of the charging pile itself, while also considering the real-time charging available power of the battery pack. At this time, heating can make the battery pack be in a stable temperature state, and charge at the maximum allowable charging power at this temperature point.

[0066] Specifically, in low-temperature slow charging, if the heating temperature does not rise enough, resulting in charging power lower than the remaining pile available power, there is obviously a waste of the maximum output power of the pile, so the efficiency will be lower than the present solution.

[0067] It can be understood that if the heating temperature is raised beyond the temperature calculated by the principle of the present solution, the battery temperature will be high in a short period of time, so the subsequent short period of time can increase the charging power, but because the battery temperature is greatly different from the ambient temperature, the heat dissipation power increases. Subsequently, since the power used for charging is increased, the power used for heating will be relatively small, and the battery temperature will gradually decrease to the limit of the charging power.

[0068] Understandably, this process is characterized by repeated fluctuations in battery temperature around the equilibrium temperature. Each fluctuation cycle can be viewed in three stages. In the first stage, the charging pile's power is primarily used for heating, thus the power available for charging must be relatively reduced. Compared to this solution, the higher heating temperature leads to greater heat dissipation power loss and a relatively slower charging speed. In this stage, the charging pile's power is more wasted on heat dissipation than this solution because of the large temperature difference between the battery pack and the environment. In the second stage, due to the initial heating, the battery pack temperature is relatively higher than in this solution, allowing for increased charging power. Therefore, the heating power must be relatively reduced, resulting in increased charging power, but the battery temperature continues to drop. In the third stage, the battery pack temperature drops, causing the charging power to fall below the remaining usable power of the charging pile, resulting in a significant waste of the pile's maximum output power. Therefore, in this process of repeated fluctuations in battery pack temperature, the power output from the charging pile to the vehicle is inefficiently utilized. Firstly, more heat is dissipated into the environment; secondly, the charging pile's power is underutilized. Therefore, given a fixed battery pack charge capacity, based on the principle of overall energy conservation, the energy transfer efficiency of the charging pile is lower than that of the solution mentioned in this case.

[0069] In this embodiment, the heating power required by the battery pack in a low-temperature environment is obtained through the battery pack's temperature rise data; combined with the maximum power that the charging pile can provide, the available charging power of the battery pack is obtained. Based on the available charging power and the maximum acceptable charging power of the battery pack, the heating requirements and tolerance of the battery pack are comprehensively considered to determine the power allocation point. This power allocation point can achieve the allocation of heating power and charging power that maximizes energy utilization, improving the charging rate and solving the allocation problem.

[0070] Furthermore, based on the above embodiments, this application also proposes a correction scheme for the power allocation point to further improve efficiency. Please refer to [link / reference]. Figure 3 , Figure 3 This is a flowchart illustrating Embodiment 2 of the low-temperature slow charging control method of this application.

[0071] In this embodiment, after the step of confirming the power allocation point based on the available charging power, steps A10 to A40 are further included:

[0072] Step A10: Obtain the self-heating power of the battery pack based on the available charging power of the battery pack.

[0073] It should be noted that the self-heating power of a battery pack refers to the heat generated during discharge or charging due to factors such as internal resistance and chemical reactions. Therefore, temperature changes depend not only on the heating power allocated to the battery pack, but also on the self-heating power of the battery pack itself, thus requiring calculation.

[0074] It can be understood that, since the charging available power of the battery pack is limited, it is not necessary to calculate the self-heating power of the battery pack throughout the whole process, but only according to the charging available power of the battery pack.

[0075] In a feasible implementation, the present scheme provides a method for obtaining the charging available power of the battery pack, as follows: based on the charging available power of the battery pack, obtaining the charging current; obtaining the rated data of the battery pack; based on the charging current and the rated data, obtaining the self-heating power of the battery pack.

[0076] It should be noted that the maximum self-heating power of the battery pack is obtained by multiplying the square of the charging current at this power and the internal resistance of the battery pack.

[0077] Specifically, referring to Figure 4 , the maximum charging power line is composed of two segments, the left segment takes the part from the maximum permissible charging power low temperature zone to the intersection point with the charging available power line, and the right segment takes the remaining part of the charging available power line. The first segment represents the maximum charging power line that can be implemented at these temperature points due to the limitation of the physical and chemical properties of the battery pack itself. After passing through the maximum permissible charging power low temperature zone to the intersection point with the charging available power line, the remaining power available for charging limits the maximum charging power that can be implemented.

[0078] Therefore, this part of heat is generally less when charging at low temperature. For example, the internal resistance of a certain 500kM endurance battery pack is less than 0.4 ohms, and the heating power of the charging current is less than 7W when charging at-15℃.

[0079] Step A20, correcting the temperature rise data of the battery pack based on the self-heating power of the battery pack.

[0080] Step A30, confirming the corrected power distribution point based on the corrected temperature rise data of the battery pack.

[0081] Step A40, distributing the power for the battery pack to charge based on the corrected power distribution point.

[0082] It can be understood that, since the charging current generates a small amount of heat in the battery pack, the heating power can be appropriately reduced, that is, the available charging power can be appropriately increased, and in actual adjustment, fine tuning can be calibrated through experiments.

[0083] Specifically, based on the above assumptions, the charging available power line is corrected to be a charging available power correction line, referring to Figure 5 , the intersection point of the charging available power correction line and the maximum permissible charging power line is the corrected optimal heating power and charging power distribution point, which is slightly moved to the right and up compared to before correction.

[0084] In the embodiment, the self-heating factor of the battery pack is considered, the distribution of the heating power is reduced, the charging power is further improved, and the charging efficiency is further improved.

[0085] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the low-temperature slow charging control method of the present application. More forms of simple transformation based on this technical concept are within the protection scope of the present application.

[0086] The present application also provides a low-temperature slow charging control device, please refer to Figure 6 The low-temperature slow charging control device comprises a data acquisition module 10, which is used to acquire temperature rise data of a battery pack; is further used to acquire available charging power of the battery pack based on the temperature rise data of the battery pack; and is further used to confirm a power distribution point based on the available charging power. A control module 20 is used to distribute power of a charging pile for charging the battery pack based on the power distribution point.

[0087] The low-temperature slow charging control device provided by the present application adopts the low-temperature slow charging control method in the above embodiment, and can solve the technical problems of slow charging and low utilization caused by poor power distribution in the prior art due to limited slow charging power in a low-temperature environment. Compared with the prior art, the low-temperature slow charging control device provided by the present application has the same beneficial effects as the low-temperature slow charging control method provided by the above embodiment, and other technical features in the low-temperature slow charging control device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0088] The present application provides a vehicle, comprising: at least one processor; and a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the low-temperature slow charging control method in the above embodiment one.

[0089] Reference will now be made to Figure 7 , which shows a structural schematic diagram of a vehicle suitable for implementing the embodiments of the present application. The vehicle in the embodiments of the present application can include but is not limited to mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), and the like, and fixed terminals such as digital TVs, desktop computers, and the like. Figure 7 The vehicle shown is only an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0090] As shown in Figure 7 The vehicle can include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes in accordance with a program stored in a read only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. In the RAM 1004, various programs and data required for the operation of the vehicle are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; the storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the vehicle to communicate wirelessly or wired with other devices to exchange data. Although the vehicle with various systems is shown in the figure, it should be understood that all the shown systems are not required to be implemented or provided. More or less systems can be alternatively implemented or provided.

[0091] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a computer readable medium, the computer program comprising program code for performing the methods illustrated by the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of embodiments of the present disclosure are performed.

[0092] The vehicle provided by the present application adopts the low-temperature slow-charging control method in the above-mentioned embodiments, which can solve the technical problems of slow charging and low utilization caused by poor power distribution in the prior art due to limited slow-charging power in low-temperature environment. Compared with the prior art, the vehicle provided by the present application has the same beneficial effects as the low-temperature slow-charging control method provided by the above-mentioned embodiments, and other technical features in the vehicle are the same as the features disclosed in the previous embodiment method, which will not be repeated here.

[0093] It should be understood that various aspects of the disclosure can be implemented in hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0094] The above description is merely illustrative of the application and is not intended to limit the scope of the application. Any variations and modifications that can be made by any person skilled in the art within the spirit and scope of the application are intended to be encompassed by the application. Therefore, the scope of the application should be determined by the appended claims.

[0095] The application provides a computer readable storage medium having stored thereon computer readable program instructions (i.e., a computer program) for performing the low-temperature slow charging control method in the above-described embodiments.

[0096] The computer readable storage medium provided by the application may, for example, be a U disk, but is not limited to an electric, magnetic, optical, electromagnetic, infrared or semiconductor system, system or device, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electric connection with one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer readable storage medium can be transmitted by any appropriate medium, including but not limited to an electric wire, an optical cable, an RF (Radio Frequency), etc., or any suitable combination of the above.

[0097] The above computer readable storage medium can be contained in a vehicle; or can exist separately without being assembled into a vehicle.

[0098] The computer readable storage medium described above carries one or more programs, when the one or more programs are executed by the vehicle, the vehicle: obtains temperature rise data of the battery pack; obtains chargeable power of the battery pack based on the temperature rise data of the battery pack; confirms a power distribution point based on the chargeable power; and distributes power of the charging pile for charging the battery pack based on the power distribution point.

[0099] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0100] The flow diagrams and the block diagrams in the drawings are illustrations of architectures, functionalities, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of present application. In this regard, each block in the flow diagrams or block diagrams can represent a module, a procedure, or a part of code, which comprises one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or in the reverse order, depending on the functionality involved. It is also noted that each block in the block diagrams and / or flow diagrams and combinations of blocks in the block diagrams and / or flow diagrams can be implemented by special-purpose hardware-based systems that perform the specified functions or operations, or combinations of special-purpose hardware and computer instructions.

[0101] The modules involved in the embodiments of the present application can be implemented in the form of software or in the form of hardware. In some cases, the name of the module does not constitute a limitation on the unit itself.

[0102] The readable storage medium provided by the application is a computer readable storage medium, which stores computer readable program instructions (i.e. computer programs) for executing the low-temperature slow charging control method described above, and can solve the technical problems of slow charging and low utilization caused by poor power distribution in the prior art due to limited slow charging power in a low-temperature environment. Compared with the prior art, the computer readable storage medium provided by the application has the same beneficial effects as the low-temperature slow charging control method provided by the above-mentioned embodiments, and will not be described here.

[0103] The application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the low-temperature slow charging control method as described above.

[0104] The computer program product provided by the application can solve the technical problems of slow charging and low utilization caused by poor power distribution in the prior art due to limited slow charging power in a low-temperature environment. Compared with the prior art, the computer program product provided by the application has the same beneficial effects as the low-temperature slow charging control method provided by the above-mentioned embodiments, and will not be described here.

[0105] The above-mentioned is only part of the embodiments of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made by using the content of the specification and drawings of the application, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A low temperature slow charging control method, characterized by, The method comprises: obtaining temperature rise data of the battery pack; obtaining the available charging power of the battery pack based on the temperature rise data of the battery pack; confirming a power distribution point based on the available charging power; allocating the power of the charging pile for charging the battery pack based on the power distribution point; The step of confirming the power distribution point based on the available charging power comprises: obtaining the maximum permissible charging power of the battery pack; mapping the available charging power of the battery pack based on the maximum permissible charging power to obtain the correspondence between the maximum permissible charging power and the available charging power; selecting the intersection point of the maximum permissible charging power and the available charging power as the power distribution point based on the correspondence.

2. The low temperature slow fill control method of claim 1, wherein, The step of obtaining the temperature rise data of the battery pack comprises: obtaining the heat conduction parameter of the battery pack; obtaining the preset heating power of the battery pack to reach the preset target temperature based on the heat conduction parameter of the battery pack; obtaining the temperature rise data of the battery pack based on the preset heating power.

3. The low temperature slow fill control method of claim 2, wherein, The step of obtaining the available charging power of the battery pack based on the temperature rise data of the battery pack comprises: obtaining the rated power of the charging pile; obtaining the remaining power of the charging pile based on the rated power of the charging pile and the temperature rise data of the battery pack; obtaining the available charging power of the battery pack based on the remaining power of the charging pile.

4. The low-temperature slow-charging control method according to claim 1 or 3, characterized by, The step of confirming the power distribution point based on the available charging power further comprises: obtaining the self-heating power of the battery pack based on the available charging power of the battery pack; correcting the temperature rise data of the battery pack based on the self-heating power of the battery pack; confirming the corrected power distribution point based on the corrected temperature rise data of the battery pack; allocating the power of the charging pile for charging the battery pack based on the corrected power distribution point.

5. The low temperature slow fill control method of claim 4, wherein, The step of obtaining the self-heating power of the battery pack based on the available charging power of the battery pack comprises: obtaining the charging current based on the available charging power of the battery pack; obtaining the rated data of the battery pack; obtaining the self-heating power of the battery pack based on the charging current and the rated data.

6. A low temperature slow charging control device, characterized by, The device comprises: a data acquisition module, configured to obtain the temperature rise data of the battery pack, and further configured to obtain the available charging power of the battery pack based on the temperature rise data of the battery pack, and further configured to confirm a power distribution point based on the available charging power; a control module, configured to allocate the power of the charging pile for charging the battery pack based on the power distribution point. The step of confirming the power distribution point based on the available charging power comprises: obtaining the maximum permissible charging power of the battery pack; mapping the available charging power of the battery pack based on the maximum permissible charging power to obtain the correspondence between the maximum permissible charging power and the available charging power; and selecting the intersection point of the maximum permissible charging power and the available charging power as the power distribution point based on the correspondence.

7. A vehicle characterized by comprising: The vehicle comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the low-temperature slow-charging control method according to any one of claims 1 to 5.

8. A storage medium, characterized by The storage medium is a computer readable storage medium, and the storage medium stores a computer program. The computer program is executed by a processor to implement the steps of the low-temperature slow charging control method in any one of claims 1 to 5.

9. A computer program product, characterised in that, The computer program product comprises a computer program. The computer program is executed by a processor to implement the steps of the low-temperature slow charging control method in any one of claims 1 to 5.

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