Power battery balancing pre-over-temperature protection method, apparatus and device, and storage medium

Abstract

A power battery balancing pre-over-temperature protection method, apparatus and device, and a storage medium. The method comprises: acquiring first real-time temperatures of balancing resistors corresponding to battery cells with balancing activated in a power battery (S10); determining whether the highest real-time temperature of the first real-time temperatures exceeds a first preset temperature threshold (S20); and if so, limiting the number of battery cells with balancing activated, so as to perform over-temperature protection (S30).

Description

Power battery equalization pre-overtemperature protection method, device, equipment and storage medium

[0001] This application claims priority to Chinese patent application No. 202410222805.4 filed on February 28, 2024, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery management technology, and in particular to a method, device, equipment and storage medium for equalizing and pre-overtemperature protection of a power battery. Background Art

[0003] With the widespread use of electric vehicles in public transportation, their ownership rate continues to rise. As onboard functions become more and more comprehensive, the use of power batteries, a core component of electric vehicles, is also increasing. The performance and lifespan of power batteries play a crucial role in the range and service life of electric vehicles.

[0004] Because the numerous single cells that make up a power battery inevitably differ during manufacturing and use, there are inconsistencies in the single cell capacity, internal resistance, self-discharge rate, and charge and discharge efficiency of each cell. As the usage time increases, the overall capacity of the power battery will decrease, which in turn will reduce the service life and may even cause a breakdown risk at the end of discharge. Therefore, a balancing function is added to the battery design to consume the energy of high-voltage or high-charge cells during the charge and discharge process to reduce the gap between different cells. However, when a large number of cells need to be balanced, the temperature of the balancing resistor rises rapidly. Currently, the balancing resistor is protected by stopping the balancing when the temperature threshold is reached, resulting in poor balancing effect.

[0005] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Technical issues

[0006] The main purpose of this application is to provide a power battery equalization pre-overtemperature protection method, device, equipment and storage medium, aiming to solve the technical problem in the prior art that the power battery equalization effect is very poor when a large number of cells are equalized and the temperature of the equalization resistor rises rapidly. Technical Solutions

[0007] To achieve the above objectives, the present application provides a power battery equalization pre-overtemperature protection method, the method comprising:

[0008] Obtaining a first real-time temperature of a balancing resistor corresponding to each battery cell in the power battery that is balancing-enabled;

[0009] Determining whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold;

[0010] If so, limit the number of cells that are evenly turned on to provide over-temperature protection.

[0011] In one embodiment, before the step of limiting the number of cells that are evenly turned on to perform over-temperature protection, the method further includes:

[0012] Get the real-time voltage of each battery cell that is turned on evenly;

[0013] Sorting the obtained real-time voltages in ascending order according to the voltage values ​​to obtain a sorting table;

[0014] The step of limiting the number of cells that are evenly turned on to perform over-temperature protection includes:

[0015] The number of cells that are evenly turned on is limited according to the order of the sorting table to provide over-temperature protection.

[0016] In one embodiment, before the step of limiting the number of cells that are evenly turned on to perform over-temperature protection, the method further includes:

[0017] Get the real-time power of each battery cell that is turned on evenly;

[0018] Sorting the acquired real-time powers from large to small according to the power values ​​to obtain a sorting table;

[0019] The step of limiting the number of cells that are evenly turned on to perform over-temperature protection includes:

[0020] The number of cells that are evenly turned on is limited according to the order of the sorting table to provide over-temperature protection.

[0021] In one embodiment, before the step of limiting the number of cells to be evenly turned on according to the order of the sorting table, the method further includes:

[0022] Get the initial number of cells in the power battery that are balanced;

[0023] Setting a preset limit number of cells that need to be equalized according to the initial number of cells;

[0024] The step of limiting the number of cells to be evenly turned on according to the order of the sorting table includes:

[0025] The balanced opening of the preset limited number of the battery cells is limited according to the order of the sorting table.

[0026] In one embodiment, the step of limiting the balancing start of the preset limited number of battery cells according to the order of the sorting table includes:

[0027] Selecting the first cell that needs to be subjected to balancing opening restriction according to the order of the sorting table;

[0028] The first battery cells are balanced and turned off, and the first battery cells that need to be balanced and restricted are selected according to the order of the sorting table until the number of the first battery cells reaches the preset limit.

[0029] In one embodiment, after the step of limiting the number of cells that are evenly turned on to perform over-temperature protection, the method further includes:

[0030] Obtain the second real-time temperature of the balancing resistor corresponding to the battery cell that is balanced after limiting;

[0031] After the highest real-time temperature among the second real-time temperatures drops below a second preset temperature threshold, the number of battery cells that are balanced and turned on is restored.

[0032] In one embodiment, after the step of obtaining the second real-time temperature of the balancing resistor corresponding to the battery cell that is balanced and turned on after the restriction, the method further includes:

[0033] After the highest real-time temperature among the second real-time temperatures exceeds a third preset temperature threshold, balancing of the power batteries is stopped.

[0034] In addition, to achieve the above-mentioned purpose, the present application also proposes a power battery equalization pre-overtemperature protection device, the device comprising:

[0035] A temperature acquisition module is used to obtain a first real-time temperature of a balancing resistor corresponding to each battery cell in the power battery that is balancing-enabled;

[0036] a temperature determination module, configured to determine whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold;

[0037] The balancing protection module is used to limit the number of cells that are opened for balancing to provide over-temperature protection.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a power battery balancing pre-overtemperature protection device, which includes: a memory, a processor, and a power battery balancing pre-overtemperature protection program stored in the memory and executable on the processor, wherein the power battery balancing pre-overtemperature protection program is configured to implement the steps of the power battery balancing pre-overtemperature protection method described above.

[0039] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a power battery balancing pre-overtemperature protection program is stored. When the power battery balancing pre-overtemperature protection program is executed by a processor, the steps of the power battery balancing pre-overtemperature protection method described above are implemented. Beneficial effects

[0040] The technical solution of this application includes: obtaining the first real-time temperature of the equalization resistor corresponding to each battery cell in the power battery that is equalized; judging whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold; if so, limiting the number of cells that are equalized to provide over-temperature protection. This method can limit the number of cells that are equalized in advance when the voltage difference between the cells in the power battery is large and equalization is activated, resulting in a rapid temperature rise, and does not directly stop the equalization of the entire power battery. It can also restore the battery to its original equalization-enabled state after the temperature drops. This improves the equalization effect of the power battery, avoids the risk of breakdown at the power supply end of the power battery due to a large voltage difference between the cells, and increases the service life of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic diagram of the structure of a power battery equalization pre-overtemperature protection device in a hardware operating environment according to an embodiment of the present application;

[0042] FIG2 is a flow chart of a first embodiment of a balanced pre-overtemperature protection method for power batteries of the present application;

[0043] FIG3 is a flow chart illustrating a second embodiment of a balanced pre-overtemperature protection method for power batteries according to the present application, based on voltage limitation;

[0044] FIG4 is a schematic diagram of a flow chart according to power limitation in a second embodiment of a balanced pre-overtemperature protection method for power batteries of the present application;

[0045] FIG5 is a flow chart showing quantity limitation in a second embodiment of a balanced pre-overtemperature protection method for power batteries of the present application;

[0046] FIG6 is a flow chart of a third embodiment of a balanced pre-overtemperature protection method for power batteries of the present application;

[0047] FIG7 is a structural block diagram of the power battery equalization pre-overtemperature protection device of the present application.

[0048] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0049] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0050] 1 , which is a schematic diagram of the structure of a power battery equalization pre-overtemperature protection device in a hardware operating environment according to an embodiment of the present application.

[0051] As shown in Figure 1, the power battery balancing pre-overtemperature protection device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display and an input unit, such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. Optionally, the memory 1005 may be a storage device independent of the processor 1001.

[0052] Those skilled in the art will understand that the structure shown in FIG1 does not constitute a limitation on the power battery equalization pre-overtemperature protection device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0053] As shown in FIG1 , the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a power battery equalization pre-overtemperature protection program.

[0054] In the power battery balancing pre-overtemperature protection device shown in FIG1 , the network interface 1004 is primarily used for data communication with a network server; the user interface 1003 is primarily used for data interaction with a user; the processor 1001 and the memory 1005 in the power battery balancing pre-overtemperature protection device of the present application may be provided in the power battery balancing pre-overtemperature protection device. The power battery balancing pre-overtemperature protection device calls a power battery balancing pre-overtemperature protection program stored in the memory 1005 via the processor 1001 and executes the power battery balancing pre-overtemperature protection method provided in the embodiments of the present application.

[0055] An embodiment of the present application provides a balanced pre-overtemperature protection method for power batteries. Referring to FIG. 2 , FIG. 2 is a flow chart of a first embodiment of the balanced pre-overtemperature protection method for power batteries of the present application.

[0056] In this embodiment, the power battery equalization pre-overtemperature protection method includes the following steps:

[0057] Step S10: obtaining a first real-time temperature of a balancing resistor corresponding to each battery cell in the power battery that is balancing-enabled.

[0058] The execution subject of this embodiment can be a computing service device (such as a mobile phone, tablet computer, personal computer, etc.) with data processing, network communication, and program execution capabilities, or an electronic device capable of performing the same or similar functions, such as the above-mentioned power battery equalization pre-overtemperature protection device. This embodiment and the following embodiments will be described using the above-mentioned power battery equalization pre-overtemperature protection device as an example.

[0059] A battery cell is the basic unit of a power battery. The operating voltage of a single cell is generally between 3V and 5V. Multiple cells are connected in series or parallel to create a power battery that meets the high capacity and voltage requirements of electric vehicles. Connecting cells in series increases voltage, while connecting cells in parallel increases capacity.

[0060] In one embodiment, when a certain difference in the State of Charge (SOC) of each battery cell is detected, balancing is initiated by connecting balancing resistors in parallel to each battery cell. For example, during charging, cells with a higher SOC discharge through the balancing resistor to consume power, allowing other cells that are not yet fully charged to continue charging, thereby maintaining the overall capacity of the power battery.

[0061] The first real-time temperature may be the temperature of each balancing resistor, collected by a temperature detection device. Since discharge through the balancing resistors continues when balancing is enabled, causing the temperature of the balancing resistors to rise, a balancing stop temperature may be set to ensure the continued reliable operation of the power battery and prevent damage to electronic components caused by overheating. When the first real-time temperature exceeds the balancing stop temperature, balancing of the entire power battery is stopped, i.e., balancing of each cell is disabled. The balancing stop temperature can be set based on specific circumstances and is not limited in this embodiment. For example, it may be set to 45 degrees Celsius or 50 degrees Celsius.

[0062] Step S20: determining whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold.

[0063] The highest real-time temperature may be the temperature with the highest value among the first real-time temperatures of the balancing resistors in the balancing-on state collected, that is, it is determined whether the temperature of the balancing resistor with the highest temperature at this time exceeds the first preset temperature.

[0064] The first preset temperature threshold may be a temperature value pre-set in the memory 1005 of the power battery balancing pre-overtemperature protection device, and is used to determine whether the temperature of the balancing resistor has risen to a value close to the balancing stop temperature. Therefore, the first preset temperature threshold may be set to a value slightly lower than the balancing stop temperature. For example, if the balancing stop temperature is set to 50 degrees Celsius, the first preset temperature threshold may be set to 40 degrees Celsius.

[0065] Step S30: If yes, limit the number of cells that are evenly turned on to perform over-temperature protection.

[0066] If the highest real-time temperature of each balancing resistor in the balancing-on state exceeds the first preset temperature, it indicates that a large number of cells are balancing, causing the power battery temperature to rise rapidly and approaching the balancing stop temperature for the entire power battery. If the balancing stop temperature is reached immediately, causing many cells to stop balancing simultaneously, the balancing effect of the power battery will be poor, and the capacity and operating stability of the power battery cannot be guaranteed.

[0067] The limiting of the number of cells that are enabled for balancing means turning off the balancing state of some cells and only turning on the balancing of some cells, so as to avoid the first real-time temperature inside the power battery exceeding the balancing stop temperature, causing all cells to stop working at the same time, while ensuring that some cells continue to maintain balancing, thereby improving the stability of equipment operation.

[0068] In this embodiment, the first real-time temperature of the balancing resistor corresponding to each cell in the power battery that is balancing enabled is obtained; the highest real-time temperature among these first real-time temperatures is determined to exceed a first preset temperature threshold; if so, the number of cells that are balancing enabled is limited to provide overtemperature protection. This method can proactively limit the number of cells that are balancing enabled when balancing is initiated due to a large cell voltage differential within the power battery, resulting in a rapid temperature rise, without directly halting balancing for the entire power battery. This improves the balancing performance of the power battery, avoids the risk of the power battery's power supply terminal stalling due to large cell voltage differentials, and thus increases the power battery's service life.

[0069] Referring to FIG3 , FIG3 is a flow chart of the second embodiment of the power battery equalization pre-overtemperature protection method according to voltage limitation. Based on the first embodiment described above, in this embodiment, the steps before step S30 include:

[0070] Step S301: obtaining the real-time voltage of each battery cell that is turned on in a balanced manner.

[0071] Because the numerous individual cells that make up a power battery inevitably vary during manufacturing and use, the SOC of each cell will vary with use, which is reflected in the voltage of each cell. The above-mentioned power battery balancing and pre-overtemperature protection device can collect the real-time voltage of each cell through a voltage detection device. In this embodiment, only the real-time voltage of the cell in the balancing state needs to be collected.

[0072] Step S302: sorting the acquired real-time voltages from small to large according to the voltage values ​​to obtain a sorting table.

[0073] The real-time voltages of the cells in the above-mentioned balancing-on state are sorted in ascending order to obtain a sorting table, that is, the higher the order of the cell in the sorting table, the smaller the real-time voltage of the cell.

[0074] The sorting table should include the cell numbers that determine the positions of the cells in each balanced on state and the arrangement numbers that determine the voltage sorting. Since the real-time voltage of each cell changes over time, the cell numbers and their corresponding arrangement numbers in the sorting table can also be variable. For example, by setting a detection time, the real-time voltage of the cell can be re-obtained every 30 seconds and the sorting table can be constructed. The setting of the detection time can be set according to actual conditions and is not limited in this embodiment.

[0075] At this time, the step S30 further includes:

[0076] Step S303: limiting the number of cells to be evenly turned on according to the order of the sorting table to perform over-temperature protection.

[0077] Limiting the number of cells with balancing enabled based on the order of the sorting table means disabling balancing for cells at the front of the sorting table, while retaining balancing for cells at the back of the sorting table. This means disabling balancing for cells with lower real-time voltages and enabling balancing for cells with higher real-time voltages.

[0078] Since the difference between the battery cell with higher real-time voltage and the average voltage of all battery cells is large, retaining the balancing of the battery cell with higher real-time voltage can ensure that the SOC of each battery cell in the power battery tends to be balanced as much as possible, thereby improving the balancing effect of the power battery.

[0079] In one embodiment, referring to FIG4 , FIG4 is a flow chart of the second embodiment of the power battery equalization pre-overtemperature protection method according to the present application according to power limitation. The step S30 includes:

[0080] Step S401: obtaining the real-time power of each battery cell that is turned on evenly.

[0081] Due to the differences in the SOC of each battery cell when balancing is turned on, the heat generated by each balancing resistor is also inconsistent. The above-mentioned power battery balancing pre-overtemperature protection device can collect the real-time power of each battery cell through a power detection device, and can also collect the real-time current of the balancing resistor in each battery cell through a current detection device to calculate the real-time power of each battery cell.

[0082] Only one of this solution and the above-mentioned solution of collecting real-time voltage can be selected, that is, determining the equalization limit battery cell number by real-time voltage or determining the equalization limit battery cell number by real-time power.

[0083] Step S402: sorting the acquired real-time voltages from large to small according to the power values ​​to obtain a sorting table.

[0084] The real-time powers of the battery cells in the above-mentioned balancing-on state are sorted from large to small to obtain a sorting table, that is, the battery cell at the front of the sorting table has a larger real-time power.

[0085] Similar to the sorting table constructed based on real-time voltage, the sorting table constructed based on real-time power should also include the cell numbers that determine the position of each cell in the balancing-on state and the permutation numbers that determine the voltage sorting. The detection time setting is also similar to the above method and will not be detailed here.

[0086] At this time, the step S30 further includes:

[0087] Step S403: limiting the number of cells to be evenly turned on according to the order of the sorting table to perform over-temperature protection.

[0088] Limiting the number of cells with balancing enabled based on the order of the sorting table means only disabling balancing for cells at the front of the sorting table, while retaining balancing for cells at the back of the sorting table. This means disabling balancing for cells with higher real-time power and enabling balancing for cells with lower real-time power.

[0089] Since cells with higher real-time power generate more heat, the temperature of their corresponding balancing resistors will rise faster, affecting the balancing of the power battery. Therefore, by preferentially shutting down cells with higher real-time power, the impact of the temperature rise of the power battery can be further mitigated, thereby improving the balancing effect of the power battery.

[0090] In one embodiment, referring to FIG5 , which is a flow chart showing quantity limitation in the second embodiment of the power battery equalization pre-overtemperature protection method of the present application, the method further includes:

[0091] Step S501: obtaining the initial number of cells in the power battery that are equalized and enabled.

[0092] The initial number of battery cells may be the number of battery cells being balanced in the power battery due to differences in SOC of the battery cells before the balancing restriction is performed.

[0093] Step S502: setting a preset limit number for equalization opening restriction according to the initial number of battery cells.

[0094] The preset limit number can be the number of cells that remain balanced and turned on after a certain number of cells are turned off when performing balancing restriction. The preset limit number can be set according to the above-mentioned initial number of cells. For example: if the initial number of cells N>10, the preset limit number is set to N / 2; if the initial number of cells N≤10, the preset limit number is set to 3. The correspondence between the initial number of cells and the preset limit number can be modified according to actual conditions. By setting the preset limit number, the stability of the equipment operation is further improved.

[0095] The above step of limiting the number of cells to be evenly turned on according to the order of the sorting table further includes:

[0096] Step S503: limiting the balancing start of the preset limited number of battery cells according to the order of the sorting table.

[0097] Taking the preset limit of 3 as an example, in step S303, only the balanced on state of the three battery cells corresponding to the last three battery cells in the sorting table is maintained, that is, the three battery cells with the largest real-time voltage are maintained in the balanced on state. In step S403, the balanced on state of the three battery cells corresponding to the last three battery cells in the sorting table is also maintained, that is, the three battery cells with the smallest real-time power are maintained in the balanced on state.

[0098] In one embodiment, step S503 further includes:

[0099] Step S504: Select the first cell that needs to be subjected to equalization opening restriction according to the order in the sorting table. (Not shown in the figure)

[0100] That is, according to the arrangement numbers and cell numbers in the above arrangement table, the cell number corresponding to the front arrangement number is the first cell.

[0101] Step S505: Turn off balancing of the first battery cell, and return to the order of the sorting table to select the first battery cell that needs to be limited by balancing, until the number of the first battery cells reaches the preset limit. (Not shown in the figure)

[0102] The cells are shut down sequentially according to the corresponding cell numbers until the number of cells remaining balanced and open reaches the preset limit. By looking up the table and sorting, the cells are shut down sequentially to avoid shutting down too many cells at once, which could affect the performance of the power battery.

[0103] Refer to Figure 6, which is a flow chart of a third embodiment of the power battery equalization pre-overtemperature protection method of the present application. Based on the above embodiments, in this embodiment, after step S30, the following is further included:

[0104] Step S601: obtaining a second real-time temperature of a balancing resistor corresponding to a battery cell that is balanced and turned on after limitation.

[0105] The second real-time temperature may be the real-time temperature of the preset limited number of balanced and enabled battery cells remaining after the balancing restriction is performed.

[0106] Step S602: after the highest real-time temperature among the second real-time temperatures drops below a second preset temperature threshold, the number of cells that are balanced and turned on is restored.

[0107] The second preset temperature threshold may be a temperature value pre-set in the memory 1005 of the power battery balancing pre-overtemperature protection device, and is used to determine whether the temperature of the balancing resistor has dropped to a threshold value sufficient for normal operation. Therefore, the second preset temperature threshold may be set to a value lower than the first preset temperature threshold. For example, if the first preset temperature threshold is set to 40 degrees Celsius, the second preset temperature threshold may be set to 30 degrees Celsius.

[0108] In one embodiment, after step S601, the method further includes:

[0109] Step S603: After the highest real-time temperature among the second real-time temperatures exceeds a third preset temperature threshold, stopping balancing of the power batteries.

[0110] The third preset temperature threshold may be a temperature value pre-set in the memory 1005 of the power battery balancing pre-overtemperature protection device, and is used to determine whether the temperature of the balancing resistor has still risen to the threshold for stopping balancing. Therefore, the third preset temperature threshold may be set to a value higher than the first preset temperature threshold, i.e., the aforementioned balancing stop temperature (e.g., 50 degrees Celsius).

[0111] In this embodiment, a second preset temperature threshold lower than the first preset temperature threshold and a third preset temperature threshold higher than the first preset temperature threshold are set. The second real-time temperature of the balancing resistor corresponding to the battery cell that is balanced after the limit is collected, and the number of battery cells that are balanced after the highest real-time temperature in the second real-time temperature drops below the second preset temperature threshold. After the highest real-time temperature in the second real-time temperature exceeds the third preset temperature threshold, the balancing of the power battery is stopped. Limiting the number of battery cells that are balanced does not directly stop the balancing of the entire power battery, and the balancing can be restored to the original balanced state after the temperature drops. This improves the balancing effect of the power battery and further increases the service life of the power battery.

[0112] In addition, an embodiment of the present application further provides a storage medium storing a power battery balancing pre-overtemperature protection program. When the power battery balancing pre-overtemperature protection program is executed by a processor, the steps of the power battery balancing pre-overtemperature protection method described above are implemented.

[0113] 7 and , FIG7 is a structural block diagram of the power battery equalization pre-overtemperature protection device of the present application.

[0114] As shown in FIG7 , the power battery equalization pre-overtemperature protection device proposed in the embodiment of the present application includes:

[0115] The temperature acquisition module 701 is configured to acquire a first real-time temperature of a balancing resistor corresponding to each battery cell in the power battery that is balancing-enabled.

[0116] The temperature judgment module 702 is configured to judge whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold.

[0117] The balancing protection module 703 is used to limit the number of cells that are opened in a balanced manner to perform over-temperature protection.

[0118] This embodiment obtains the first real-time temperature of the balancing resistor corresponding to each cell in the power battery that is balancing enabled; determines whether the highest of these first real-time temperatures exceeds a first preset temperature threshold; and if so, limits the number of cells that are balancing enabled to provide overtemperature protection. This method can preemptively limit the number of cells that are balancing enabled when balancing is initiated due to a large cell voltage differential within the power battery, resulting in a rapid temperature rise, without directly halting balancing for the entire power battery. This improves the balancing performance of the power battery, avoids the risk of the power battery's power supply terminal stalling due to large cell voltage differentials, and increases the service life of the power battery.

[0119] In one embodiment, the balancing protection module 703 is further used to obtain the real-time voltage of each battery cell that is balanced and turned on; sort the obtained real-time voltages from large to small according to the voltage value to obtain a sorting table; and limit the number of battery cells that are balanced and turned on according to the order of the sorting table to perform over-temperature protection.

[0120] In one embodiment, the balancing protection module 703 is further used to obtain the real-time power of each battery cell that is turned on in a balanced manner; sort the obtained real-time power from small to large according to the power value to obtain a sorting table; and limit the number of battery cells that are turned on in a balanced manner according to the order of the sorting table to perform over-temperature protection.

[0121] In one embodiment, the balancing protection module 703 is further used to obtain the initial number of cells in the power battery that are balanced and turned on; set a preset limit number of cells that need to be balanced and turned on according to the initial number of cells; and limit the balanced turning on of the preset limit number of cells according to the order of the sorting table.

[0122] In one embodiment, the balancing protection module 703 is further used to select the first battery cell that needs to be restricted by balancing according to the order of the sorting table; turn off balancing of the first battery cell, and return to selecting the first battery cell that needs to be restricted by balancing according to the order of the sorting table until the number of the first battery cells reaches the preset limit.

[0123] In one embodiment, the balancing protection module 703 is further used to obtain the second real-time temperature of the balancing resistor corresponding to the battery cell that is balanced and turned on after the restriction; and the number of battery cells that are balanced and turned on is restored after the highest real-time temperature among the second real-time temperatures drops below a second preset temperature threshold.

[0124] In one embodiment, the balancing protection module 703 is further configured to stop balancing of the power batteries after the highest real-time temperature among the second real-time temperatures exceeds a third preset temperature threshold.

[0125] Other embodiments or specific implementations of the power battery equalization pre-overtemperature protection device of the present application can refer to the above-mentioned method embodiments and will not be repeated here.

[0126] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0127] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0128] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0129] The above are only some embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power battery equalization pre-overtemperature protection method, wherein: The power battery equalization pre-overtemperature protection method includes: Obtaining a first real-time temperature of a balancing resistor corresponding to each battery cell in the power battery that is balancing-enabled; Determining whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold; If so, limit the number of cells that are evenly turned on to provide over-temperature protection.

2. The power battery equalization pre-overtemperature protection method according to claim 1, wherein: Before the step of limiting the number of cells that are evenly turned on to perform over-temperature protection, the method further includes: Get the real-time voltage of each battery cell that is turned on evenly; Sorting the obtained real-time voltages in ascending order according to the voltage values ​​to obtain a sorting table; The step of limiting the number of cells that are evenly turned on to perform over-temperature protection includes: The number of cells that are evenly turned on is limited according to the order of the sorting table to provide over-temperature protection.

3. The power battery equalization pre-overtemperature protection method according to claim 1, wherein: Before the step of limiting the number of cells that are evenly turned on to perform over-temperature protection, the method further includes: Get the real-time power of each battery cell that is turned on evenly; Sorting the acquired real-time powers from large to small according to the power values ​​to obtain a sorting table; The step of limiting the number of cells that are evenly turned on to perform over-temperature protection includes: The number of cells that are evenly turned on is limited according to the order of the sorting table to provide over-temperature protection.

4. The power battery equalization pre-overtemperature protection method according to any one of claims 2 to 3, wherein: Before the step of limiting the number of cells to be evenly turned on according to the order of the sorting table, the method further includes: Get the initial number of cells in the power battery that are balanced; Setting a preset limit number of cells that need to be equalized according to the initial number of cells; The step of limiting the number of cells to be evenly turned on according to the order of the sorting table includes: The balanced opening of the preset limited number of the battery cells is limited according to the order of the sorting table.

5. The power battery equalization pre-overtemperature protection method according to claim 4, wherein: The step of limiting the balanced opening of the preset limited number of battery cells according to the order of the sorting table includes: Selecting the first cell that needs to be subjected to balancing opening restriction according to the order of the sorting table; The first battery cells are balanced and turned off, and the first battery cells that need to be balanced and restricted are selected according to the order of the sorting table until the number of the first battery cells reaches the preset limit.

6. The power battery equalization pre-overtemperature protection method according to claim 1, wherein: After the step of limiting the number of cells that are evenly turned on to perform over-temperature protection, the method further includes: Obtain the second real-time temperature of the balancing resistor corresponding to the battery cell that is balanced after limiting; After the highest real-time temperature among the second real-time temperatures drops below a second preset temperature threshold, the number of battery cells that are balanced and turned on is restored.

7. The power battery equalization pre-overtemperature protection method according to claim 6, wherein: After the step of obtaining the second real-time temperature of the balancing resistor corresponding to the battery cell that is balanced and turned on after the restriction, the method further includes: After the highest real-time temperature among the second real-time temperatures exceeds a third preset temperature threshold, balancing of the power batteries is stopped.

8. A power battery equalization pre-overtemperature protection device, wherein: The device comprises: A temperature acquisition module is used to obtain a first real-time temperature of a balancing resistor corresponding to each battery cell in the power battery that is balancing-enabled; a temperature determination module, configured to determine whether the highest real-time temperature among the first real-time temperatures exceeds a first preset temperature threshold; The balancing protection module is used to limit the number of cells that are opened for balancing to provide over-temperature protection.

9. A power battery equalization pre-overtemperature protection device, wherein: The device includes: a memory, a processor, and a power battery balancing pre-overtemperature protection program stored in the memory and executable on the processor, wherein the power battery balancing pre-overtemperature protection program is configured to implement the steps of the power battery balancing pre-overtemperature protection method according to any one of claims 1 to 7.

10. A storage medium, wherein: The storage medium stores a power battery balancing pre-overtemperature protection program, which, when executed by the processor, implements the steps of the power battery balancing pre-overtemperature protection method according to any one of claims 1 to 7.

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