Charging method and device, electronic equipment and storage medium

Abstract

The application discloses a charging method and device, electronic equipment and storage medium. The method comprises the following steps: acquiring the charging parameters of each battery module in a battery pack in a current charging mode; wherein the battery pack has a plurality of battery modules, and the current charging mode comprises a series charging mode; if it is determined that the charging conversion condition is met between any two battery modules based on the charging parameters of each battery module, the plurality of battery modules are switched from the series charging mode to the parallel charging mode, so that the conversion from the series charging to the parallel charging is realized before the overlarge charging and discharging current occurs, and the risk of lithium precipitation of the battery is reduced, and the charging safety of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a charging method, apparatus, electronic device, and storage medium. Background Technology

[0002] The existing 800V charging architecture consists of two battery modules. When the system determines that 800V charging is available, the two battery modules are connected in series for charging to accelerate the charging speed. After charging is complete, the two battery modules switch to parallel connection, using a standard 400V output voltage as the operating voltage.

[0003] However, in this charging mode, there is a phenomenon where a high-voltage battery module discharges to a low-voltage battery module, resulting in a large instantaneous charging and discharging current, which can cause safety issues such as battery overheating and lithium plating. Summary of the Invention

[0004] In view of the above problems, this application provides a charging method, apparatus, electronic device and storage medium.

[0005] In a first aspect, this application provides a charging method, which includes: acquiring charging parameters of each battery module in a battery pack under a current charging mode; wherein the battery pack has multiple battery modules, and the current charging mode includes a series charging mode; if it is determined based on the charging parameters of each battery module that any two battery modules meet the charging conversion conditions, then controlling the multiple battery modules to switch from a series charging mode to a parallel charging mode.

[0006] In the technical solution of this application embodiment, in a battery pack where multiple battery modules are charged in series, the charging parameters of each battery module are collected. Then, based on the charging parameters of each battery module, it is determined that any two battery modules meet the charging transition conditions. This indicates that the series charging method may have problems such as heat generation and lithium plating due to excessive charging and discharging current, or other potential damage to the battery due to excessive charging and discharging current. Based on this, this solution controls the multiple battery modules in the battery pack to switch from series charging to parallel charging, thereby enabling the battery pack to switch from series charging to parallel charging before excessive charging and discharging current occurs. This reduces the risk of lithium plating or avoids other potential damage to the battery, improving the charging safety of the battery pack.

[0007] In some embodiments, the charging parameters include module voltage; determining whether any two battery modules meet the charging conversion condition based on the charging parameters of each battery module includes: calculating the module voltage difference between every two battery modules; if the module voltage difference between any two battery modules exceeds a preset voltage difference threshold, then it is determined that the charging conversion condition is met between any two battery modules. This embodiment detects the module voltage of the battery modules, then calculates the module voltage difference between every two battery modules, and determines the charging conversion condition by comparing the module voltage difference between the battery modules with a preset voltage difference threshold. This allows for timely control of the battery pack to switch from series charging to parallel charging when the module voltage difference between battery modules is large, thereby reducing the risk of lithium plating or avoiding other problems that may damage the battery, and improving the charging safety of the battery pack.

[0008] In some embodiments, the charging parameters include battery module voltage and cell temperature; determining that any two battery modules meet the charging conversion conditions based on the charging parameters of each battery module includes: determining the highest cell temperature based on the cell temperature of each battery module; calculating the module voltage difference between every two battery modules in the plurality of battery modules; calculating the charging conversion value between the corresponding two battery modules based on the module voltage difference between every two battery modules and the highest cell temperature; if the charging conversion value of any two battery modules exceeds a preset charging conversion threshold, then it is determined that any two battery modules meet the charging conversion conditions. This application embodiment detects the module voltage and cell temperature of the battery module, then calculates the module voltage difference and the highest cell temperature between every two battery modules. Based on the module voltage difference and the highest cell temperature, a charging conversion value is calculated, and then compared with a preset charging conversion threshold. This allows for timely control of the battery pack to switch from series charging to parallel charging when the charging conversion value exceeds the preset threshold. Thus, based on the module voltage difference and cell temperature, the charging conversion conditions are accurately determined, thereby more accurately reducing the risk of lithium plating and improving the charging safety of the battery pack.

[0009] In some embodiments, calculating the charging conversion value between two battery modules based on the module voltage difference and the highest cell temperature includes: calculating the charging conversion value between two battery modules using a charging conversion value calculation formula, wherein the charging conversion value calculation formula is: M = kT + U; where M represents the charging conversion value between two battery modules, k represents a preset coefficient, T represents the highest cell temperature, and U represents the module voltage difference between the two corresponding battery modules. This embodiment of the application accurately calculates the charging conversion value based on the module voltage difference and the highest cell temperature between battery modules using the charging conversion value calculation formula, thereby enabling more accurate determination of charging conversion conditions based on the accurately calculated charging conversion value, and thus achieving accurate control of the series charging to parallel charging conversion.

[0010] In some embodiments, the charging parameters include module voltage; before determining that any two battery modules meet the charging conversion conditions based on the charging parameters of each battery module, the method further includes: determining a target battery module among a plurality of battery modules based on the module voltage of each battery module; and reducing the module voltage of the target battery module.

[0011] In some embodiments, determining the target battery module among multiple battery modules based on the module voltage of each battery module includes: determining the battery module with the highest module voltage among the multiple battery modules as the target battery module. This application embodiment determines the battery module with the highest module voltage among multiple battery modules as the target battery module based on the module voltage of each battery module, and then reduces the module voltage of the battery module with the highest module voltage. This reduces the module voltage difference between battery modules during battery pack charging, prolongs the time when the module voltage difference is greater than a preset voltage difference threshold or the charging conversion value is greater than a preset charging conversion threshold, thereby delaying the time for switching from series charging to parallel charging. This extends the series charging time of the battery pack, and since series charging has higher charging efficiency than parallel charging, it improves the charging efficiency of the battery pack while ensuring that safety issues such as lithium plating do not occur.

[0012] In some embodiments, reducing the module voltage of the target battery module includes: using a load circuit to consume the module voltage of the target battery module, thereby reducing the module voltage of the target battery module. This application embodiment directly consumes the module voltage of the target battery module through a load circuit, thus simplifying the reduction of the module voltage of the target battery module.

[0013] In some embodiments, reducing the module voltage of the target battery module includes: acquiring the individual cell voltage of each cell in the target battery module; identifying the cell with the highest individual cell voltage as the target cell; and using a load circuit to consume the power of the target cell to reduce the module voltage of the target battery module. This embodiment first identifies the cell with the highest individual cell voltage in the target battery module as the target cell, and then uses a load circuit to consume the power of the target cell to reduce the module voltage of the target battery module, thus making the voltage reduction more targeted and precise.

[0014] Secondly, this application provides a charging device, including: an acquisition module and a control module; the acquisition module is used to acquire the charging parameters of each battery module in the battery pack under the current charging mode; wherein the current charging mode includes a series charging mode; the control module is used to control multiple battery modules to switch from a series charging mode to a parallel charging mode after determining that the charging conversion conditions between any two battery modules are met based on the charging parameters of each battery module.

[0015] In the technical solution of this application embodiment, in the mode of series charging of multiple battery modules in the battery pack, the charging parameters of each battery module are collected. Then, based on the charging parameters of each battery module, it is determined that any two battery modules meet the charging conversion conditions. This indicates that the series charging method may have problems such as heat generation and lithium plating caused by excessive charging and discharging current. On this basis, this solution controls the multiple battery modules of the battery pack to switch from series charging to parallel charging. This allows the battery pack to realize the conversion from series charging to parallel charging before the charging and discharging current becomes too large, thereby reducing the risk of lithium plating and improving the charging safety of the battery pack.

[0016] In some embodiments, the charging parameters include module voltage, and the device further includes a determining module, specifically used to calculate the module voltage difference between every two battery modules in the plurality of battery modules; if the voltage difference between any two battery modules exceeds a preset voltage difference threshold, then it is determined that the charging conversion conditions are met between any two battery modules.

[0017] In some embodiments, the charging parameters include battery module voltage and cell temperature. The determining module is further configured to determine the highest cell temperature based on the cell temperature of each battery module; calculate the module voltage difference between every two battery modules in the plurality of battery modules; calculate the charging conversion value between the corresponding two battery modules based on the module voltage difference between every two battery modules and the highest cell temperature; and determine that the charging conversion condition is met between any two battery modules if the charging conversion value of any two battery modules exceeds a preset charging conversion threshold.

[0018] In some embodiments, the determining module is further configured to calculate the charging conversion value between two corresponding battery modules based on the module voltage difference and the highest cell temperature between the two battery modules using a charging conversion value calculation formula, wherein the charging conversion value calculation formula is: M = kT + U; where M represents the charging conversion value between two battery modules, k represents a preset coefficient, T represents the highest cell temperature, and U represents the module voltage difference between the two corresponding battery modules.

[0019] In some embodiments, the charging parameters include module voltage; the determining module is further configured to determine a target battery module among a plurality of battery modules based on the module voltage of each battery module; the device further includes a voltage reduction module for reducing the module voltage of the target battery module.

[0020] In some embodiments, the determining module is further configured to determine the battery module with the highest module voltage among a plurality of battery modules as the target battery module.

[0021] In some embodiments, the voltage reduction module is specifically used to consume the module voltage of the target battery module using a load circuit, thereby reducing the module voltage of the target battery module.

[0022] In some embodiments, the voltage reduction module is further configured to acquire the individual cell voltage of each cell in the target battery module; determine the cell with the highest individual cell voltage as the target cell; and use a load circuit to consume the power of the target cell to reduce the module voltage of the target battery module.

[0023] Thirdly, this application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the method described in the first aspect or any optional implementation thereof.

[0024] Fourthly, this application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the method described in the first aspect or any optional implementation thereof.

[0025] Fifthly, this application provides a computer program product that, when run on a computer, causes the computer to perform the method described in the first aspect or any optional implementation thereof.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a structural diagram of the vehicle provided in this application;

[0029] Figure 2 A first flowchart of the charging method provided in this application;

[0030] Figure 3 This is a schematic diagram of the circuit topology provided in this application;

[0031] Figure 4 A second process diagram of the charging method provided in this application;

[0032] Figure 5 A schematic diagram of the third process of the charging method provided in this application;

[0033] Figure 6 A schematic diagram of the fourth process of the charging method provided in this application;

[0034] Figure 7 A schematic diagram of the charging device provided in this application;

[0035] Figure 8 A schematic diagram of the structure of the electronic device provided in this application.

[0036] The reference numerals in the detailed embodiments are as follows:

[0037] 10-Vehicle; 100-Battery; 200-Controller; 300-Motor; B1, B2-Battery Module; S1, S2, S3-Switch; 700-Acquisition Module; 710-Control Module; 720-Determination Module; 730-Voltage Reduction Module; 8-Electronic Equipment; 801-Processor; 802-Memory; 803-Communication Bus. Detailed Implementation

[0038] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0043] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0044] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] The current 800V charging architecture for new energy batteries consists of two battery modules in the battery pack. To speed up the charging process, the two battery modules are connected in series during 800V charging. After charging is completed, the two battery modules are connected in parallel, with the conventional 400V voltage output as the working voltage.

[0047] The inventors have noticed that currently available conventional 800V charging architecture new energy batteries suffer from insufficient consistency between the two battery modules in the battery pack. When charging in series, the voltages are inconsistent. This causes the high-voltage battery module to discharge the moment it switches to parallel connection after charging, forcing the low-voltage battery module to charge. Since the internal resistance of the two battery modules is very small, the current during instantaneous charging and discharging is very large, which can lead to battery overheating and even fire or lithium plating safety issues.

[0048] The inventors discovered that the charging parameters of the battery can be continuously monitored during the charging process, such as the battery voltage and / or temperature. When the voltage difference and / or temperature of the two battery modules reach a certain relationship, the charging can be switched to parallel charging, thereby avoiding problems such as heat generation and lithium plating caused by excessive charging and discharging current after the charging is completed.

[0049] Through in-depth research, the inventors designed a charging method, device, electronic device, and storage medium. This method monitors the charging parameters of each battery module in charging mode and determines whether the charging conversion conditions between any two battery modules are met based on the charging parameters of each battery module. If the charging conversion conditions are met between any two battery modules, the method controls multiple battery modules to switch from series charging mode to parallel charging mode, thereby avoiding problems such as heat generation and lithium plating caused by excessive charging and discharging current after charging is completed, and improving battery charging safety.

[0050] The charging method, apparatus, electronic device, and storage medium disclosed in the embodiments of this application can be applied to power equipment that uses batteries as a power source, including but not limited to electrical devices such as vehicles, ships, or aircraft.

[0051] For ease of explanation, the following embodiments will be described using a vehicle 10 as an example of an electrical device according to an embodiment of this application.

[0052] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 10 provided in some embodiments of this application. The vehicle 10 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 10, and the battery 100 can be located at the bottom, front, or rear of the vehicle 10. The battery 100 can be used to power the vehicle 10; for example, the battery 100 can serve as the operating power source for the vehicle 10. The vehicle 10 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 10 during starting, navigation, and driving.

[0053] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 10, but also as the driving power source for the vehicle 10, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10.

[0054] It should be noted that in this application, the battery 100 serves as the driving power source for the vehicle 10, providing driving power to the vehicle 10.

[0055] This application provides a charging method applicable to computing devices, including but not limited to battery management systems (BMS), processors, and computers. Figure 2 As shown, the method specifically includes the following steps:

[0056] Step S200: Obtain the charging parameters of each battery module in the battery pack under the current charging mode.

[0057] Step S210: If the charging parameters of each battery module determine that any two battery modules meet the charging conversion conditions, then control the multiple battery modules to switch from series charging mode to parallel charging mode.

[0058] In the above embodiments, the battery pack designed in this solution has multiple battery modules. For example, the battery pack may contain two battery modules or three battery modules.

[0059] Based on the above, the designed battery pack charging modes have two types: series charging and parallel charging. Series charging means all battery modules in the battery pack are charged in series, while parallel charging means all battery modules in the battery pack are charged in parallel. For example, with two battery modules... Figure 3For example, when switches S1 and S3 are open and switch S2 is closed, battery modules B1 and B2 are charged in series; when switches S1 and S3 are closed and switch S2 is open, battery modules B1 and B2 are charged in parallel. The principle is similar when there are multiple battery modules, and will not be elaborated further here.

[0060] In step S200, the current charging mode represents a series charging method, that is, all battery modules in the battery pack are charged in series. In other words, when this scheme executes step S200, it is under the condition that all battery modules in the battery pack are charged in series, and the charging parameters of each battery module are collected. The charging parameters of each battery module may include the module voltage, the cell temperature, etc.

[0061] After collecting the charging parameters of each battery module in the battery pack, this solution can determine whether the charging transition conditions are met between any two battery modules based on the charging parameters of each battery module. If the charging transition conditions are met between any two battery modules, it indicates that there may be safety issues with the battery pack under the current series charging method. Based on this, this solution controls the multiple battery modules of the battery pack to switch from series charging to parallel charging. Specifically, according to... Figure 3 In the circuit structure shown, in the series charging mode, switches S1 and S3 are open and switch S2 is closed. Based on this, when the series charging mode is switched to parallel charging mode in step S220, switches S1 and S3 can be closed and switch S2 can be opened, thereby realizing the switch from series charging to parallel charging.

[0062] The charging method described above involves collecting the charging parameters of each battery module in a series charging mode within the battery pack. Based on these parameters, it determines if any two battery modules meet the charging conversion conditions. If so, it indicates that the series charging method may suffer from problems such as excessive charging / discharging current leading to heat generation and lithium plating. Therefore, this solution controls the multiple battery modules in the battery pack to switch from series charging to parallel charging. This allows the battery pack to switch from series charging to parallel charging before excessive charging / discharging current occurs, thereby reducing the risk of lithium plating and improving the charging safety of the battery pack.

[0063] According to some embodiments of this application, the charging parameters of the aforementioned battery module are based on the module voltage described above, which may include the battery module. Figure 4 As shown, step 210 above, which determines the charging conversion conditions between any two battery modules based on the charging parameters of each battery module, may include the following steps:

[0064] Step S400: Calculate the module voltage difference between every two battery modules in the multiple battery modules.

[0065] Step S410: If the voltage difference between any two battery modules exceeds the preset voltage difference threshold, then it is determined that the charging conversion conditions between any two battery modules are met.

[0066] In step S400, after acquiring the module voltage of each battery module, the module voltage difference between every two battery modules can be calculated based on the module voltage of each battery module. Assuming there are three battery modules, and the module voltages of the three battery modules are U1, U2 and U3 respectively, then the voltage differences of the three modules can be calculated as follows: U12 = U1 - U2; U13 = U1 - U3; U23 = U2 - U3.

[0067] Based on the above, this solution compares the voltage difference between any two battery modules with a preset voltage difference threshold. For example, assuming the preset voltage difference threshold is U, in the above example, this solution can compare U12, U13, and U23 with U respectively. If any module voltage difference exceeds the voltage difference threshold U, it means that the voltage difference between the two battery modules exceeding the voltage difference threshold U is too large, which may cause heat generation and lithium deposition due to large charging and discharging current. Therefore, at this time, it is determined that the charging conversion conditions are met between any two battery modules, and step S220 is executed to control the multiple battery modules of the battery pack to switch from series charging mode to parallel charging mode.

[0068] This application embodiment detects the module voltage of the battery module, then calculates the module voltage difference between every two battery modules, and determines the charging switching conditions by comparing the module voltage difference between the battery modules with a preset voltage difference threshold. In this way, when the module voltage difference between the battery modules is large, the battery pack can be switched from series charging mode to parallel charging mode in a timely manner, thereby reducing the risk of lithium plating and improving the charging safety of the battery pack.

[0069] According to some embodiments of this application, in addition to voltage changes, cell temperature changes often occur during battery pack charging. Cell temperature changes can affect the boundary threshold of the module voltage difference. Therefore, this solution can not only rely on the module voltage difference to determine the charging conversion conditions, but also use both the module voltage difference and cell temperature to determine the charging conversion conditions. Based on this, the aforementioned step S210 determines that any two battery modules meet the charging conversion conditions based on the charging parameters of each battery module. Figure 5 As shown, the specific steps may include the following:

[0070] Step S500: Determine the maximum cell temperature based on the cell temperature of each battery module.

[0071] Step S510: Calculate the module voltage difference between every two battery modules in the multiple battery modules.

[0072] Step S520: Calculate the charging conversion value between the two battery modules based on the module voltage difference and the highest cell temperature between each pair of battery modules.

[0073] Step S530: If the charging conversion value of any two battery modules exceeds the preset charging conversion threshold, then it is determined that the charging conversion condition is met between any two battery modules.

[0074] In the above embodiments, a temperature detection device can be installed in each battery module. The temperature detection device can detect the cell temperature of the corresponding battery module. Based on this, this solution can determine the highest cell temperature among all battery modules according to the cell temperature of each battery module.

[0075] Then, this scheme can execute step S510 to calculate the module voltage difference between every two battery modules based on the module voltage of each battery module. The method of calculating the module voltage difference is the same as the calculation method of step S400 mentioned above, and will not be repeated here.

[0076] Based on the above, this scheme calculates the charging conversion value between two battery modules according to the module voltage difference and the highest cell temperature between each pair of battery modules. Then, it compares the charging conversion value between any two battery modules with a preset charging conversion threshold. If the charging conversion value between any two battery modules exceeds the preset charging conversion threshold, it indicates that the module voltage difference between the two battery modules with the preset charging conversion threshold is too large, which may cause heat generation and lithium deposition due to a large charging and discharging current. Therefore, at this time, it is determined that the charging conversion condition is met between any two battery modules, and step S220 is executed to control the multiple battery modules of the battery pack to switch from series charging mode to parallel charging mode.

[0077] For example, assuming there are three battery modules with module voltages U1, U2, and U3, the voltage differences between the three modules can be calculated as follows: U12 = U1 - U2; U13 = U1 - U3; U23 = U2 - U3. The highest cell temperature is T. Based on this, this scheme can calculate the charging conversion value M1 corresponding to the module voltage difference U12, the charging conversion value M2 corresponding to the module voltage difference U13, and the charging conversion value M3 corresponding to the module voltage difference U23. The preset charging conversion threshold is M4. Based on this, this scheme compares M1, M2, and M3 with the preset charging conversion threshold M4. If any charging conversion value is greater than the preset charging conversion threshold M4, it is determined that the charging conversion condition is met between any two battery modules, and thus step S220 is executed to control the multiple battery modules of the battery pack to switch from series charging mode to parallel charging mode.

[0078] This application embodiment detects the module voltage and cell temperature of the battery module, then calculates the module voltage difference and the highest cell temperature between every two battery modules. Based on the module voltage difference and the highest cell temperature, a charging conversion value is calculated, and then compared with a preset charging conversion threshold. This allows for timely control of the battery pack to switch from series charging to parallel charging when the charging conversion value exceeds the preset threshold. Thus, based on the module voltage difference and cell temperature, the charging conversion conditions are accurately determined, thereby more accurately reducing the risk of lithium plating and improving the charging safety of the battery pack.

[0079] According to some embodiments of this application, for step S520, this solution can specifically calculate the charging conversion value in the following manner: Specifically, this solution can calculate the charging conversion value according to the charging conversion value calculation formula, which is as follows:

[0080] M = kT + U.

[0081] Where M represents the charging conversion value between the two battery modules, k represents the preset coefficient, T represents the highest cell temperature, and U represents the module voltage difference between the two corresponding battery modules.

[0082] For example, following the example above, M1 = kT + U 12 M2 = kT + U 13 M3 = kT + U 23 .

[0083] As a possible specific example, the value range of the preset system k can be 0.004 to 0.006; specifically, the preset coefficient k can be 0.005. When the preset coefficient k is 0.005, the preset charging conversion threshold can be 0.7. That is, when the charging conversion value between two battery modules is greater than 0.7, it is determined that the charging conversion condition is met between any two battery modules, thereby executing step S220 to control the multiple battery modules of the battery pack to switch from series charging mode to parallel charging mode.

[0084] In the above embodiments, this solution accurately calculates the charging conversion value based on the module voltage difference and the highest cell temperature between battery modules using the charging conversion value calculation formula. This allows for a more accurate determination of the charging conversion conditions based on the accurately calculated charging conversion value, thereby achieving accurate control of the series charging to parallel charging conversion.

[0085] According to some embodiments of this application, the charging parameters described above may include module voltage. Before determining, in step S210, that the charging conversion conditions between any two battery modules are met based on the charging parameters of each battery module, such asFigure 6 As shown, this solution may also include the following steps:

[0086] Step S600: Determine the target battery module among multiple battery modules based on the module voltage of each battery module.

[0087] Step S610: Reduce the module voltage of the target battery module.

[0088] In the above implementation method, this solution determines the target battery module based on the module voltage of each battery module. Specifically, this solution can determine the battery module with the highest module voltage among multiple battery modules as the target battery module. For example, if the module voltages of the three battery modules are U1, U2 and U3 respectively, if module voltage U3 is the highest, then the battery module with module voltage U3 is determined as the target battery module.

[0089] Based on the above, this solution can reduce the module voltage of the battery module with the highest module voltage. This reduces the voltage difference between battery modules during battery pack charging, thereby extending the time when the module voltage difference exceeds a preset voltage difference threshold or the charging conversion value exceeds a preset charging conversion threshold. This delays the time for series charging to switch to parallel charging, thus extending the series charging time of the battery pack. Since series charging has higher charging efficiency than parallel charging, this improves the charging efficiency of the battery pack while ensuring that safety issues such as lithium plating do not occur.

[0090] In one specific implementation, each battery module in this solution's battery pack is connected in parallel with a load circuit. This solution can directly reduce the module voltage of the target battery module by consuming the load circuit. In another specific implementation, to more accurately reduce the module voltage of the target battery module, this solution can obtain the individual cell voltage of each cell in the target battery module. Each battery module has multiple cells, and the module voltage of the battery module is equal to the sum of the voltages of all the cells in the battery module. Then, based on the individual cell voltage, this solution identifies the cell with the highest individual voltage as the target cell, and then uses a load circuit to consume the energy of the target cell, thereby reducing the module voltage of the target battery module. Each cell can be connected in parallel with a load circuit for energy consumption.

[0091] It should be noted that the load circuit mentioned above can be a resistive load circuit. The resistive load circuit is connected in parallel with the target battery module or target cell. When it is necessary to consume the power of the target battery module or target cell, the resistive load circuit can be turned on, so that the power of the target battery module or target cell is consumed by the resistor through heat dissipation, thereby reducing the module voltage of the target battery module.

[0092] In this embodiment, the battery module with the highest voltage among multiple battery modules is identified as the target battery module based on the module voltage of each battery module. Then, the module voltage of the battery module with the highest voltage is reduced, thereby reducing the voltage difference between battery modules during the battery pack charging process. This prolongs the time when the module voltage difference is greater than a preset voltage difference threshold or the charging conversion value is greater than a preset charging conversion threshold, thus delaying the time for switching from series charging to parallel charging. This extends the series charging time of the battery pack, and since series charging has higher charging efficiency than parallel charging, the charging efficiency of the battery pack is improved while ensuring that safety issues such as lithium plating do not occur.

[0093] Figure 7 A schematic structural block diagram of a charging device provided in this application is shown. It should be understood that this device is related to... Figures 2 to 6 The method embodiment executed in the above text corresponds to the steps involved in the aforementioned method. The specific functions of this device can be found in the description above; to avoid repetition, detailed descriptions are omitted here. This device includes at least one software function module that can be stored in a memory or embedded in the device's operating system (OS) in the form of software or firmware. Specifically, the device includes: an acquisition module 700 and a control module 710; the acquisition module 700 is used to acquire the charging parameters of each battery module in the battery pack under the current charging mode; wherein the current charging mode includes a series charging mode; the control module 710 is used to control multiple battery modules to switch from a series charging mode to a parallel charging mode after determining, based on the charging parameters of each battery module, that the charging conversion conditions between any two battery modules are met.

[0094] In the technical solution of this application embodiment, in the mode of series charging of multiple battery modules in the battery pack, the charging parameters of each battery module are collected. Then, based on the charging parameters of each battery module, it is determined that any two battery modules meet the charging conversion conditions. This indicates that the series charging method may have problems such as heat generation and lithium plating caused by excessive charging and discharging current. On this basis, this solution controls the multiple battery modules of the battery pack to switch from series charging to parallel charging. This allows the battery pack to realize the conversion from series charging to parallel charging before the charging and discharging current becomes too large, thereby reducing the risk of lithium plating and improving the charging safety of the battery pack.

[0095] According to some embodiments of this application, the charging parameters include module voltage. The device also includes a determination module 720, which is specifically used to calculate the module voltage difference between every two battery modules in the plurality of battery modules; if the voltage difference between any two battery modules exceeds a preset voltage difference threshold, it is determined that the charging conversion conditions are met between any two battery modules.

[0096] According to some embodiments of this application, optionally, the charging parameters include battery module voltage and cell temperature. The determining module 720 is specifically used to determine the highest cell temperature based on the cell temperature of each battery module; calculate the module voltage difference between every two battery modules in the multiple battery modules; calculate the charging conversion value between the corresponding two battery modules based on the module voltage difference between every two battery modules and the highest cell temperature; if the charging conversion value of any two battery modules exceeds a preset charging conversion threshold, then it is determined that the charging conversion condition is met between any two battery modules.

[0097] Optionally, according to some embodiments of this application, the determining module 720 is further configured to calculate the charging conversion value between two corresponding battery modules based on the module voltage difference and the highest cell temperature between the two battery modules using a charging conversion value calculation formula, wherein the charging conversion value calculation formula is:

[0098] M = kT + U.

[0099] Where M represents the charging conversion value between the two battery modules, k represents the preset coefficient, T represents the highest cell temperature, and U represents the module voltage difference between the two corresponding battery modules.

[0100] According to some embodiments of this application, the charging parameters include module voltage; the determining module 720 is further configured to determine a target battery module among a plurality of battery modules based on the module voltage of each battery module; the device also includes a voltage reduction module 730 for reducing the module voltage of the target battery module.

[0101] According to some embodiments of this application, the determining module 720 is also specifically used to determine the battery module with the highest module voltage among a plurality of battery modules as the target battery module.

[0102] According to some embodiments of this application, the voltage reduction module 730 is specifically used to consume the module voltage of the target battery module using a load circuit, so as to reduce the module voltage of the target battery module.

[0103] According to some embodiments of this application, the voltage reduction module 730 is also specifically used to obtain the individual cell voltage of each cell in the target battery module; determine the cell with the highest individual cell voltage as the target cell; and use a load circuit to consume the power of the target cell in order to reduce the module voltage of the target battery module.

[0104] According to some embodiments of this application, such as Figure 8As shown, this application provides an electronic device 8, including: a processor 801 and a memory 802. The processor 801 and the memory 802 are interconnected and communicate with each other through a communication bus 803 and / or other forms of connection mechanism (not shown). The memory 802 stores a computer program executable by the processor 801. When the computing device is running, the processor 801 executes the computer program to execute the method executed by the external terminal in any optional implementation, such as steps S200 to S220: obtaining the charging parameters of each battery module in the battery pack under the current charging mode; if it is determined based on the charging parameters of each battery module that the charging conversion conditions between any two battery modules are met, then controlling the multiple battery modules to switch from series charging mode to parallel charging mode.

[0105] This application provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the method in any of the aforementioned optional implementations.

[0106] The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0107] This application provides a computer program product that, when run on a computer, causes the computer to perform a method in any of the optional implementations.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A charging method, characterized in that, The method includes: Obtain the charging parameters of each battery module in the battery pack under the current charging mode; wherein, the battery pack has multiple battery modules, and the current charging mode includes series charging mode; If the charging parameters of each battery module determine that any two battery modules meet the charging conversion conditions, then the multiple battery modules are controlled to switch from series charging mode to parallel charging mode. The charging parameters include battery module voltage and cell temperature; determining the charging conversion conditions between any two battery modules based on the charging parameters of each battery module includes: The maximum cell temperature is determined based on the cell temperature of each battery module. Calculate the voltage difference between any two battery modules in a multi-module system; The charging conversion value is calculated using the charging conversion value calculation formula, based on the module voltage difference and the highest cell temperature between each pair of battery modules. The charging conversion value calculation formula is as follows: M = kT+U; Where M represents the charging conversion value between the two battery modules, k represents the preset coefficient, T represents the highest cell temperature, and U represents the module voltage difference between the two corresponding battery modules. If the charging conversion values ​​of any two battery modules exceed the preset charging conversion threshold, then the charging conversion conditions between any two battery modules are determined to be met.

2. The method according to claim 1, characterized in that, in, The charging parameters include module voltage; determining the charging conversion conditions between any two battery modules based on the charging parameters of each battery module includes: Calculate the voltage difference between any two battery modules in a multi-module system; If the voltage difference between any two battery modules exceeds a preset voltage difference threshold, then the charging conversion conditions between any two battery modules are determined to be met.

3. The method according to claim 1, characterized in that, in, The charging parameters include module voltage; before determining, based on the charging parameters of each battery module, that the charging conversion condition is met between any two battery modules, the method further includes: The target battery module is determined from multiple battery modules based on the module voltage of each battery module. Reduce the module voltage of the target battery module.

4. The method according to claim 3, characterized in that, The step of determining the target battery module among multiple battery modules based on the module voltage of each battery module includes: The battery module with the highest module voltage among multiple battery modules is identified as the target battery module.

5. The method according to claim 3, characterized in that, The step of reducing the module voltage of the target battery module includes: using a load circuit to consume the module voltage of the target battery module in order to reduce the module voltage of the target battery module.

6. The method according to claim 3, characterized in that, The step of reducing the module voltage of the target battery module includes: obtaining the individual cell voltage of each cell in the target battery module; The cell with the highest single-cell voltage is identified as the target cell; A load circuit is used to consume the power of the target cell in order to reduce the module voltage of the target battery module.

7. A charging device, characterized in that, The device includes: an acquisition module and a control module; The acquisition module is used to acquire the charging parameters of each battery module in the battery pack under the current charging mode; wherein, the current charging mode includes series charging mode; The control module is used to control the multiple battery modules to switch from series charging mode to parallel charging mode after determining that the charging conversion conditions between any two battery modules are met based on the charging parameters of each battery module. The charging parameters include battery module voltage and cell temperature; determining the charging conversion conditions between any two battery modules based on the charging parameters of each battery module includes: The maximum cell temperature is determined based on the cell temperature of each battery module. Calculate the voltage difference between any two battery modules in a multi-module system; The charging conversion value is calculated using the charging conversion value calculation formula, based on the module voltage difference and the highest cell temperature between each pair of battery modules. The charging conversion value calculation formula is as follows: M = kT+U; Where M represents the charging conversion value between the two battery modules, k represents the preset coefficient, T represents the highest cell temperature, and U represents the module voltage difference between the two corresponding battery modules. If the charging conversion values ​​of any two battery modules exceed the preset charging conversion threshold, then the charging conversion conditions between any two battery modules are determined to be met.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 6.

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