Balancing control method and control device of power battery, storage medium and vehicle

Abstract

The application discloses a kind of equalization control method and control device of power battery, storage medium, vehicle, the power battery includes multiple battery monomers, the method comprises: in response to equalization instruction, the residual state-of-charge of each battery monomer in multiple battery monomers is obtained;Determine the first difference between the maximum residual state-of-charge and the minimum residual state-of-charge in multiple residual state-of-charge;According to the first difference interval corresponding to the first difference, determine the target equalization duration of power battery, wherein different first difference interval corresponds to different target equalization duration;According to target equalization duration, equalization is carried out to power battery.The equalization control method of the application can dynamically adjust the equalization duration of power battery, improve the effect of equalization control.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a power battery equalization control method, a power battery equalization control device, a computer-readable storage medium, and a vehicle. Background Technology

[0002] Most power batteries on the market now have a BMS (Battery Management System) balancing function, which mainly adjusts the capacity and voltage between individual battery cells to ensure that there are no weak points between cells that would affect the use of the battery system. Among them, electric vehicles on the market mainly use passive balancing, which can work during vehicle operation and charging, but the duration of operation is relatively fixed. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, the first objective of this invention is to propose a method for equalization control of a power battery. This method involves determining a first difference between the maximum and minimum remaining charge capacity among multiple remaining charge capacity values, and determining a target equalization duration for the power battery based on the first difference interval corresponding to the first difference value. The power battery is then equalized according to the target equalization duration, thereby dynamically adjusting the equalization duration and improving the effectiveness of equalization control.

[0004] The second objective of this invention is to provide a power battery equalization control device.

[0005] A third objective of this invention is to provide a computer-readable storage medium.

[0006] The fourth objective of this invention is to provide a vehicle.

[0007] To achieve the above objectives, a first aspect of the present invention provides a method for balancing control of a power battery, the power battery comprising a plurality of battery cells, the method comprising: in response to a balancing command, acquiring the remaining charge of each of the plurality of battery cells; determining a first difference between the maximum and minimum remaining charge among the plurality of remaining charge; determining a target balancing time of the power battery based on a first difference interval corresponding to the first difference, wherein different first difference intervals correspond to different target balancing times; and balancing the power battery according to the target balancing time.

[0008] According to an embodiment of the present invention, the power battery balancing control method first responds to a balancing command by acquiring the remaining charge of each of a plurality of battery cells. Then, it determines a first difference between the maximum and minimum remaining charge among the plurality of remaining charge values. Next, it determines a target balancing time for the power battery based on a first difference interval corresponding to the first difference value, wherein different first difference intervals correspond to different target balancing times. Finally, it balances the power battery according to the target balancing time. Therefore, this method can dynamically adjust the balancing time of the power battery, improving the effectiveness of balancing control.

[0009] In addition, the power battery equalization control method according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to one embodiment of the present invention, the method further includes: generating the equalization command in response to a vehicle power-down request.

[0011] According to an embodiment of the present invention, before balancing the power battery according to the target balancing duration, the method further includes: controlling the vehicle to enter a dormant state when the first difference is less than a preset difference; balancing the power battery according to the target balancing duration when the first difference is greater than or equal to the preset difference, and controlling the vehicle to enter a dormant state after balancing is completed.

[0012] According to one embodiment of the present invention, the method further includes: generating the equalization command in response to a wake-up signal when the vehicle is in a dormant state.

[0013] According to an embodiment of the present invention, before balancing the power battery according to the target balancing duration, the method further includes: when the first difference is less than a preset difference, controlling the vehicle to continue in a dormant state; when the first difference is greater than or equal to the preset difference, balancing the power battery according to the target balancing duration, and after balancing is completed, controlling the vehicle to continue in a dormant state.

[0014] According to one embodiment of the present invention, the wake-up signal is determined by: obtaining a second difference between the maximum remaining charge and the minimum remaining charge after the current equalization is completed; determining a wake-up interval based on the second difference interval corresponding to the second difference; and generating the wake-up signal when the vehicle's sleep duration reaches the wake-up interval.

[0015] According to an embodiment of the present invention, the method further includes: obtaining a third difference between the maximum remaining charge and the minimum remaining charge at the start of each equalization, and a fourth difference between the maximum remaining charge and the minimum remaining charge at the end of each equalization; performing a consistency evaluation on the power battery based on the deviation between the third difference and the fourth difference to obtain an evaluation result; and determining whether the power battery needs to be replaced based on the evaluation result corresponding to each equalization in multiple equalizations.

[0016] To achieve the above objectives, a second aspect of the present invention provides a power battery balancing control device, wherein the power battery includes multiple battery cells, and the device includes: an acquisition module, configured to acquire the remaining charge of each of the multiple battery cells in response to a balancing command; a first determination module, configured to determine a first difference between the maximum and minimum remaining charge among the multiple remaining charge values; a second determination module, configured to determine a target balancing time of the power battery based on a first difference interval corresponding to the first difference value, wherein different first difference intervals correspond to different target balancing times; and a balancing module, configured to balance the power battery according to the target balancing time.

[0017] According to an embodiment of the present invention, a power battery balancing control device includes an acquisition module for acquiring the remaining charge of each of a plurality of battery cells in response to a balancing command; a first determining module for determining a first difference between the maximum and minimum remaining charge among the plurality of remaining charge values; a second determining module for determining a target balancing time for the power battery based on a first difference interval corresponding to the first difference value, wherein different first difference intervals correspond to different target balancing times; and a balancing module for balancing the power battery according to the target balancing time. Thus, the device can dynamically adjust the balancing time of the power battery, improving the effectiveness of balancing control.

[0018] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the above-described power battery equalization control method.

[0019] According to the computer-readable storage medium of the present invention, by executing the above-described power battery balancing control method, the balancing duration of the power battery can be dynamically adjusted, thereby improving the balancing control effect.

[0020] To achieve the above objectives, a vehicle is provided in a fourth aspect of the present invention, comprising a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the above-described power battery equalization control method.

[0021] According to the vehicle of the present invention, by executing the above-described power battery equalization control method, the equalization duration of the power battery can be dynamically adjusted, thereby improving the effect of equalization control.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 A flowchart of a power battery equalization control method according to an embodiment of the present invention;

[0024] Figure 2 A flowchart illustrating a power battery equalization control method according to a specific example of the present invention;

[0025] Figure 3 A flowchart illustrating a power battery equalization control method according to another specific example of the present invention;

[0026] Figure 4 This is a block diagram of a power battery balancing control device according to an embodiment of the present invention.

[0027] Figure 5 This is a block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The following description, with reference to the accompanying drawings, outlines an embodiment of the present invention of a power battery balancing control method, a power battery balancing control device, a computer-readable storage medium, and a vehicle.

[0030] Figure 1 This is a flowchart of a power battery balancing control method according to an embodiment of the present invention.

[0031] like Figure 1 As shown, the power battery balancing control method of this embodiment may include the following steps:

[0032] S1, in response to the balancing command, obtains the remaining charge of each of the multiple battery cells.

[0033] S2, determine the first difference between the maximum and minimum remaining charge among multiple remaining charge values.

[0034] S3, determine the target equilibrium time of the power battery based on the first difference interval corresponding to the first difference, wherein different first difference intervals correspond to different target equilibrium times.

[0035] S4 balances the power battery according to the target balancing time.

[0036] Specifically, in a power battery composed of multiple battery cells connected in series, differences inevitably exist between the individual cells during manufacturing. Furthermore, variations in heat dissipation, charging, and discharging during battery use lead to voltage differences between the individual cells, a phenomenon known as battery cell imbalance. If this imbalance is not addressed promptly, the voltage differences between the cells will widen, resulting in performance degradation and reduced battery life. Therefore, battery balancing is necessary. This involves responding to balancing commands and obtaining the remaining charge capacity of each individual cell, representing the current percentage of charge held by that cell relative to the total capacity of the battery cells.

[0037] When determining the remaining charge of each battery cell, for example, the voltage value of the battery cell can be obtained, and then the remaining charge can be obtained by looking up a two-dimensional table ocv-soc. In this two-dimensional table, each voltage value corresponds to a remaining charge, and the corresponding remaining charge can be determined after determining a voltage value.

[0038] After obtaining the remaining charge of each individual battery cell, the remaining charge of multiple battery cells can be evaluated to determine the maximum and minimum remaining charge. A first difference is then determined, which is the maximum remaining charge minus the minimum remaining charge. It should be noted that if the maximum and minimum remaining charge are equal, the first difference is zero.

[0039] After determining the first difference, the corresponding first difference interval can be determined based on the first difference. For example, the first difference interval can be divided into intervals of 5%. For instance, the first difference in interval 1 is between 0% and 5% (greater than 0% and less than 5%), the first difference in interval 2 is between 5% and 10% (greater than or equal to 5% and less than 10%), the first difference in interval 3 is between 10% and 15% (greater than or equal to 10% and less than 15%), and so on. The first difference is between 15% and 20% (greater than or equal to 15% and less than 20%). In the first difference interval 5, the first difference is between 15% and 20% (greater than or equal to 20% and less than 25%). In the first difference interval 6, the first difference is between 25% and 30% (greater than or equal to 25% and less than 30%). When the first difference is greater than 30%, it can be determined that the first difference falls within the first difference interval 7, i.e., the first difference is between 30% and 100% (greater than or equal to 30% and less than 100%). It should be noted that when dividing the intervals, other proportional divisions can also be used, such as 10% or 15%, or divisions can be made using an increasing percentage method, such as the first difference in first difference interval 1 being 0%-5%, the first difference in first difference interval 2 being 5%-15%, and the first difference in first difference interval 3 being 15%-30%, etc.

[0040] Different first difference intervals correspond to different target balancing times. The target balancing time of the power battery can be determined based on the first difference interval. For example, when the first difference is in a larger first difference interval, the target balancing time can be longer, and when the first difference is in a smaller first difference interval, the target balancing time can be shorter. Thus, the power battery can be balanced according to the target balancing time. Therefore, the balancing time can be dynamically adjusted according to the state of the individual battery cells, thereby achieving a better balancing effect.

[0041] For example, taking the first difference interval as described above, if the first difference is in the first difference interval 1, it indicates that the current power battery voltage difference consistency is good, and no equalization operation is needed; if the first difference is in the first difference interval 2, it indicates that the current power battery has a certain voltage difference, but the difference is not large, and the target equalization time can be determined as h1 hours, for example, h1 can be 2 hours; if the first difference is in the first difference interval 3, it indicates that the current power battery has a certain voltage difference, and the target equalization time can be determined as h2 hours, for example, h1 can be 4 hours; if the first difference is in the first difference interval 4, it indicates that the current power battery voltage difference is not large, and no equalization operation is needed; if the first difference is in the first difference interval 4, it indicates that the current power battery voltage difference is not large, and no equalization operation is needed. If the battery has a certain pressure difference, the target equalization time can be determined as h3 hours, for example, h3 can be 6 hours. If the first difference is in the first difference interval 5, it indicates that the current power battery has a certain pressure difference, and the target equalization time can be determined as h4 hours, for example, h4 can be 8 hours. If the first difference is in the first difference interval 6, it indicates that the current power battery has a certain pressure difference, and the target equalization time can be determined as h5 hours, for example, h5 can be 10 hours. If the first difference is in the first difference interval 7, it indicates that the current power battery has a certain pressure difference, and the difference is relatively large, and the target equalization time can be determined as h6 hours, for example, h6 can be 12 hours. It should be noted that h1, h2, h3, h4, h5, and h6 can be determined according to the actual situation, such as adaptive adjustments based on different power battery models, current ambient temperature, etc. Therefore, when the first difference is large, a larger equalization time can be used for equalization, and when the first difference is small, a smaller equalization time can be used for equalization, resulting in a better equalization effect.

[0042] Therefore, by determining the first difference between the maximum and minimum remaining charge among multiple remaining charge values, and determining the target balancing time of the power battery based on the first difference interval corresponding to the first difference value, the power battery can be balanced according to the target balancing time, thereby dynamically adjusting the balancing time of the power battery and improving the balancing control effect.

[0043] According to one embodiment of the present invention, the power battery equalization control method further includes: generating an equalization command in response to a vehicle power-off request.

[0044] Specifically, in addition to normal balancing operations during vehicle charging or driving, the battery can also be balanced after the vehicle is powered off. Since the power battery remains operational after the vehicle stops working, it can use its own electrical energy to enable the BMS controller to operate. By consuming a small amount of the power battery's own electrical energy, it can balance the power battery. This responds to the vehicle's power-off request and generates balancing commands, thereby balancing the power battery when the vehicle is powered off and extending its lifespan.

[0045] According to one embodiment of the present invention, before balancing the power battery according to the target balancing duration, the method further includes: controlling the vehicle to enter a dormant state when the first difference is less than a preset difference; balancing the power battery according to the target balancing duration when the first difference is greater than or equal to the preset difference, and controlling the vehicle to enter a dormant state after balancing is completed. The preset difference can be determined according to actual conditions.

[0046] Specifically, before balancing the power battery according to the target balancing time, it is necessary to determine the relationship between the first difference and the preset difference. When the first difference is less than the preset difference, it indicates that the current first difference is small. In other words, the difference between the maximum and minimum remaining charge of the multiple battery cells is small, the voltage difference of the power battery is consistent, and no balancing operation is required. The vehicle can be controlled to enter a sleep state. When the first difference is greater than or equal to the preset difference, it indicates that the current first difference is large. The power battery can be balanced according to the target balancing time. After balancing, the voltage difference of the power battery is consistent, the first difference gradually decreases, i.e., it is less than the preset difference, and the vehicle can be controlled to enter a sleep state.

[0047] For example, taking the aforementioned first difference interval division as an example, the preset difference can be 5%. That is, when the first difference is less than the preset difference of less than 5%, such as when the first difference is 3%, it can be determined that the first difference is in the first difference interval 1, and the vehicle can be controlled to enter a dormant state. When the first difference is greater than or equal to the preset difference of 5%, such as when the first difference is 8%, it can be determined that the first difference is in the first difference interval 2, and the target balancing time can be determined to be 2 hours. Thus, the power battery is balanced according to the target balancing time of 2 hours, and after balancing is completed, the vehicle is controlled to enter a dormant state. As another example, when the first difference is 35%, it can be determined that the first difference is in the first difference interval 7, and the target balancing time can be determined to be 12 hours. Thus, the power battery is balanced according to the target balancing time of 12 hours, and after balancing is completed, the vehicle is controlled to enter a dormant state.

[0048] According to one embodiment of the present invention, the equalization control method for a power battery further includes: generating an equalization command in response to a wake-up signal when the vehicle is in a dormant state. The wake-up signal is determined by: obtaining a second difference between the maximum remaining charge and the minimum remaining charge after the current equalization is completed; determining a wake-up interval based on the second difference interval corresponding to the second difference; and generating a wake-up signal when the vehicle's dormant duration reaches the wake-up interval.

[0049] Specifically, when the vehicle is in a dormant state, it can respond to a wake-up signal and generate a balancing command to balance the power battery. For example, a timed wake-up function can be used. After the vehicle has been in a dormant state for a period of time, in order to ensure good voltage difference consistency of the power battery, a timed wake-up interval can be set. For example, by accumulating a timer for 30 minutes, the vehicle can be woken up after 30 minutes of dormancy, and the power battery can be balanced.

[0050] In one embodiment of the present invention, when determining the wake-up signal, the difference between the maximum remaining charge and the minimum remaining charge can be obtained again after the current equalization of the power battery, i.e., the second difference. The second difference may be the same as or different from the first difference. The wake-up interval can be determined according to the second difference interval corresponding to the second difference. Different second differences correspond to different second difference intervals, and different second difference intervals correspond to different wake-up intervals. For example, the larger the second difference, the shorter the wake-up interval; the smaller the second difference, the longer the wake-up interval. This is so that when the vehicle's sleep time reaches the wake-up interval, a wake-up signal is generated, thereby generating an equalization command to equalize the power battery again.

[0051] According to an embodiment of the present invention, before balancing the power battery according to the target balancing duration, the power battery balancing control method further includes: when the first difference is less than a preset difference, controlling the vehicle to continue in a dormant state; when the first difference is greater than or equal to the preset difference, balancing the power battery according to the target balancing duration, and after balancing is completed, controlling the vehicle to continue in a dormant state.

[0052] Specifically, before balancing the power battery according to the target balancing time, it is necessary to determine the relationship between the first difference and the preset difference. When the first difference is less than the preset difference, it indicates that the current first difference is small. In other words, the difference between the maximum and minimum remaining charge of the multiple battery cells is small, the voltage difference of the power battery is consistent, and no balancing operation is required. The vehicle can remain in a dormant state. When the first difference is greater than or equal to the preset difference, it indicates that the current first difference is large. The power battery can be balanced according to the target balancing time. After balancing, the voltage difference of the power battery is consistent, the first difference gradually decreases, i.e., it becomes less than the preset difference, and the vehicle can remain in a dormant state.

[0053] For example, taking the aforementioned first difference interval division as an example, the preset difference can be 5%. That is, when the first difference is less than the preset difference of less than 5%, such as when the first difference is 1%, it can be determined that the first difference is in the first difference interval 1, and the vehicle can be controlled to continue to be in a dormant state. When the first difference is greater than or equal to the preset difference of 5%, such as when the first difference is 12%, it can be determined that the first difference is in the first difference interval 3, and the target balancing time can be determined to be 4 hours. Thus, the power battery is balanced according to the target balancing time of 4 hours, and after the balancing is completed, the vehicle is controlled to continue to be in a dormant state. As another example, when the first difference is 25%, it can be determined that the first difference is in the first difference interval 6, and the target balancing time can be determined to be 10 hours. Thus, the power battery is balanced according to the target balancing time of 10 hours, and after the balancing is completed, the vehicle is controlled to continue to be in a dormant state.

[0054] According to an embodiment of the present invention, the equalization control method for a power battery further includes: obtaining a third difference between the maximum remaining charge and the minimum remaining charge at the start of each equalization, and a fourth difference between the maximum remaining charge and the minimum remaining charge at the end of each equalization; performing a consistency evaluation on the power battery based on the deviation between the third difference and the fourth difference to obtain an evaluation result; and determining whether the power battery needs to be replaced based on the evaluation result corresponding to each equalization in multiple equalizations.

[0055] Specifically, the power batteries of electric vehicles undergo repeated charging and discharging processes during use, which affects the inconsistencies between individual battery cells. These inconsistencies directly impact battery performance and safety, potentially leading to safety hazards during vehicle operation. Therefore, it is necessary to assess the capacity consistency of the power batteries and identify any capacity inconsistency issues.

[0056] The process involves obtaining a third difference between the maximum and minimum remaining charge at the start of each equalization cycle and a fourth difference at the end of each equalization cycle. Based on the deviation between these two differences, a consistency evaluation of the power battery is performed. For example, a small difference indicates that the capacity of each cell in the power battery is consistent within the allowable capacity deviation range, meaning the overall cell capacity of the power battery is the same. Conversely, a large difference indicates inconsistency in the capacity of each cell, suggesting individual cell degradation. Therefore, based on the evaluation results of each equalization cycle, it can be determined whether the power battery needs replacement. For instance, if cell degradation is identified, replacing the power battery can ensure the driving safety and lifespan of the electric vehicle. If the overall cell capacity of the power battery is consistent, replacement is not necessary.

[0057] As a concrete example, such as Figure 2 As shown, the battery balancing control method when the vehicle is powered off may include the following steps:

[0058] S101, Determine if the vehicle is powered off. If yes, proceed to step S102; otherwise, proceed to step S109.

[0059] S102 generates equalization instructions.

[0060] S103, obtain the remaining charge of each of the multiple battery cells.

[0061] S104, determine the first difference between the maximum and minimum remaining charge among multiple remaining charge values.

[0062] S105, determine the target equalization time of the power battery based on the first difference interval corresponding to the first difference.

[0063] S106, Determine whether the first difference is less than the preset difference. If yes, proceed to step S107; if no, proceed to step S108.

[0064] S107, controls the vehicle to enter sleep mode.

[0065] S108 balances the power battery according to the target balancing time.

[0066] S109, vehicles continue to move.

[0067] As a concrete example, such as Figure 3 As shown, the battery balancing control method during vehicle hibernation may include the following steps:

[0068] S201, Determine if the vehicle is in a dormant state. If yes, proceed to step S202; otherwise, proceed to step S212.

[0069] S202, obtain the second difference between the maximum and minimum remaining charge after the balancing is completed.

[0070] S203, determine the wake-up interval duration based on the second difference interval corresponding to the second difference.

[0071] S204, determine whether the vehicle's sleep duration has reached the wake-up interval. If yes, proceed to step S205; if no, proceed to step S203.

[0072] S205 generates a wake-up signal and generates an equalization command.

[0073] S206, obtain the remaining charge of each of the multiple battery cells.

[0074] S207, determine the first difference between the maximum and minimum remaining charge among multiple remaining charge values.

[0075] S208, determine the target equalization time of the power battery based on the first difference interval corresponding to the first difference.

[0076] S209, determine whether the first difference is less than the preset difference. If yes, proceed to step S210; if no, proceed to step S211.

[0077] S210, keep the vehicle in a dormant state.

[0078] S211 balances the power battery according to the target balancing time, and after balancing is completed, controls the vehicle to continue to be in a dormant state.

[0079] In summary, the power battery balancing control method according to embodiments of the present invention first responds to a balancing command by acquiring the remaining charge of each of multiple battery cells. Then, it determines a first difference between the maximum and minimum remaining charge values ​​among the multiple remaining charge values. Next, it determines a target balancing time for the power battery based on a first difference interval corresponding to the first difference value, wherein different first difference intervals correspond to different target balancing times. Finally, it balances the power battery according to the target balancing time. Therefore, this method can dynamically adjust the balancing time of the power battery, improving the effectiveness of balancing control.

[0080] Corresponding to the above embodiments, the present invention also proposes a power battery equalization control device.

[0081] like Figure 4 As shown, the power battery balancing control device 100 of this embodiment includes: an acquisition module 110, a first determination module 120, a second determination module 130, and a balancing module 140.

[0082] The acquisition module 110 is used to acquire the remaining charge of each of the multiple battery cells in response to the balancing command. The first determination module 120 is used to determine a first difference between the maximum and minimum remaining charge among the multiple remaining charge values. The second determination module 130 is used to determine the target balancing time of the power battery based on the first difference interval corresponding to the first difference value, wherein different first difference intervals correspond to different target balancing times. The balancing module 140 is used to balance the power battery according to the target balancing time.

[0083] According to one embodiment of the present invention, the equalization module 140 is further configured to: generate an equalization command in response to a vehicle power-off request.

[0084] According to one embodiment of the present invention, before balancing the power battery according to the target balancing time, the balancing module 140 is further configured to: control the vehicle to enter a dormant state when the first difference is less than a preset difference; and balance the power battery according to the target balancing time when the first difference is greater than or equal to the preset difference, and control the vehicle to enter a dormant state after the balancing is completed.

[0085] According to one embodiment of the present invention, the equalization module 140 is further configured to: generate an equalization command in response to a wake-up signal when the vehicle is in a sleep state.

[0086] According to one embodiment of the present invention, before the equalization module 140 equalizes the power battery according to the target equalization duration, the method further includes: when the first difference is less than a preset difference, controlling the vehicle to continue in a dormant state; when the first difference is greater than or equal to the preset difference, equalizing the power battery according to the target equalization duration, and after the equalization is completed, controlling the vehicle to continue in a dormant state.

[0087] According to an embodiment of the present invention, the equalization module 140 is further configured to: obtain a second difference between the maximum remaining charge and the minimum remaining charge after the current equalization is completed; determine the wake-up interval duration based on the second difference interval corresponding to the second difference; and generate a wake-up signal when the vehicle's sleep duration reaches the wake-up interval duration.

[0088] According to an embodiment of the present invention, the first determining module 120 is further configured to: obtain a third difference between the maximum remaining charge and the minimum remaining charge at the start of each equalization, and a fourth difference between the maximum remaining charge and the minimum remaining charge at the end of each equalization; perform a consistency evaluation on the power battery based on the deviation between the third difference and the fourth difference, and obtain an evaluation result; and determine whether the power battery needs to be replaced based on the evaluation result corresponding to each equalization in multiple equalizations.

[0089] It should be noted that for details not disclosed in the power battery balancing control device of this embodiment of the invention, please refer to the details disclosed in the power battery balancing control method of this embodiment of the invention, which will not be repeated here.

[0090] According to an embodiment of the present invention, a power battery balancing control device includes an acquisition module for acquiring the remaining charge of each of a plurality of battery cells in response to a balancing command; a first determining module for determining a first difference between the maximum and minimum remaining charge among the plurality of remaining charge values; a second determining module for determining a target balancing time for the power battery based on a first difference interval corresponding to the first difference value, wherein different first difference intervals correspond to different target balancing times; and a balancing module for balancing the power battery according to the target balancing time. Thus, the device can dynamically adjust the balancing time of the power battery, improving the effectiveness of balancing control.

[0091] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0092] The computer-readable storage medium of this invention stores a program that, when executed by a processor, implements the above-described power battery equalization control method.

[0093] According to the computer-readable storage medium of the present invention, by executing the above-described power battery balancing control method, the balancing duration of the power battery can be dynamically adjusted, thereby improving the balancing control effect.

[0094] Corresponding to the above embodiments, the present invention also proposes a vehicle.

[0095] like Figure 5 As shown, the vehicle 200 of this embodiment may include: a memory 210, a processor 220, and a program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the program, it realizes the above-mentioned equalization control of the power battery.

[0096] According to the vehicle of the present invention, by executing the above-described power battery equalization control method, the equalization duration of the power battery can be dynamically adjusted, thereby improving the effect of equalization control.

[0097] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0098] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0099] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0101] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0102] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for equalization control of a power battery, characterized in that, The power battery includes a plurality of battery monomers, and the method comprises: In response to the equalization instruction, the residual charge of each battery monomer in the plurality of battery monomers is obtained; A first difference between the maximum residual charge and the minimum residual charge in the plurality of residual charges is determined; According to the first difference value corresponding to the first difference interval, the target equalization time of the power battery is determined, wherein different first difference intervals correspond to different target equalization times; According to the target equalization time, the power battery is equalized; In response to the wake-up signal when the vehicle is in a dormant state, the equalization instruction is generated; Before the power battery is equalized according to the target equalization time, the method further comprises: When the first difference is less than a preset difference, the vehicle continues to be in a dormant state; When the first difference is greater than or equal to the preset difference, the power battery is equalized according to the target equalization time, and after the equalization is completed, the vehicle continues to be in a dormant state; The wake-up signal is determined by: After this equalization is completed, a second difference between the maximum residual charge and the minimum residual charge is obtained; According to the second difference value corresponding to the second difference interval, the wake-up interval time is determined; When the dormant time of the vehicle reaches the wake-up interval time, the wake-up signal is generated.

2. The method of claim 1, wherein, The method further comprises: In response to the vehicle power-off request, the equalization instruction is generated.

3. The method of claim 2, wherein, Before the power battery is equalized according to the target equalization time, the method further comprises: When the first difference is less than a preset difference, the vehicle enters a dormant state; When the first difference is greater than or equal to the preset difference, the power battery is equalized according to the target equalization time, and after the equalization is completed, the vehicle enters a dormant state.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: The third difference between the maximum residual charge and the minimum residual charge at the beginning of each equalization and the fourth difference between the maximum residual charge and the minimum residual charge at the completion of each equalization are obtained; According to the deviation between the third difference and the fourth difference, the consistency of the power battery is evaluated to obtain an evaluation result; According to the evaluation result corresponding to each equalization in multiple equalizations, it is determined whether the power battery needs to be replaced.

5. A balancing control device for a power battery, characterized in that, The equalization control device of the power battery is used to execute the method of any one of claims 1-4, the power battery includes a plurality of battery monomers, and the device comprises: An acquisition module is configured to obtain the residual charge of each battery monomer in the plurality of battery monomers in response to an equalization instruction; A first determination module is configured to determine a first difference between the maximum residual charge and the minimum residual charge in the plurality of residual charges; A second determination module is configured to determine the target equalization time of the power battery according to the first difference value corresponding to the first difference interval, wherein different first difference intervals correspond to different target equalization times; An equalization module is configured to equalize the power battery according to the target equalization time.

6. A computer-readable storage medium, characterized in that, A program is stored thereon, and the program is executed by a processor to implement the equalization control method of the power battery according to any one of claims 1-4.

7. A vehicle characterized by comprising: A program is stored thereon, and the program is executed by a processor to implement the equalization control method of the power battery according to any one of claims 1-4.

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