Battery pack internal resistance adjustment method and system, device, equipment, medium and product

Abstract

The application relates to a battery pack internal resistance adjusting method and system, device, equipment, medium and product. Based on predetermined state information of a battery pack, a target control strategy is determined. According to the target control strategy, the control switches corresponding to each battery in the battery pack are controlled to be closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack. In the application, a control switch is connected in series with each battery in the battery pack, and the internal resistance is adjusted by using the switch to control the pulse current, so that the equipment cost is greatly reduced without a complex screening device and a thermal management system hardware.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and in particular to a method, system, device, equipment, medium and product for adjusting the internal resistance of a battery pack. Background Technology

[0002] With the ever-increasing demand for energy storage, battery packs have been widely used in numerous fields. However, parallel battery packs can cause many problems due to inconsistent internal resistance. Differences in battery aging and temperature will manifest as inconsistencies in internal resistance. In parallel systems, these inconsistencies in battery internal resistance will cause significant current differences at the end of charging and discharging. This phenomenon will lead to a rapid increase in battery temperature, potentially triggering thermal runaway. Simultaneously, the larger current may cause over-discharging of the battery, accelerating battery aging and severely impacting the battery pack's lifespan and safety.

[0003] Current common strategies for controlling internal resistance uniformity rely on heat dissipation to maintain temperature uniformity within the battery pack, thereby reducing internal resistance unevenness. However, heat dissipation typically requires complex cooling systems, significantly increasing the manufacturing and operating costs of the battery system. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, system, device, equipment, medium, and product for adjusting the internal resistance of a battery pack that can reduce costs, in order to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a method for adjusting the internal resistance of a battery pack, the method comprising:

[0006] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0007] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0008] In one embodiment, the aforementioned state information includes the battery operating time, open-circuit voltage, and initial charge of each battery; based on the predetermined state information of the battery pack, a target control strategy is determined, including:

[0009] When the battery operating time, open circuit voltage, and initial charge meet the triggering conditions of the same charging amount, the first regulation strategy is determined as the target regulation strategy; the first regulation strategy is used to regulate the pulse current of each battery in the battery pack.

[0010] When the battery operating time, open circuit voltage, and initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy; the second control strategy is used to control the charging time of each battery.

[0011] In one embodiment, the above-mentioned control of the control switches corresponding to each battery in the battery pack being closed or opened according to the target control strategy, and the adjustment of the heat generation of each battery in the battery pack, includes:

[0012] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0013] When the target control strategy is the first control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0014] A short-duration high-amplitude pulse current is input to the target battery, and a long-duration low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack; wherein, the pulse amplitude of the short-duration high-amplitude pulse current is higher than that of the long-duration low-amplitude pulse current, and the input duration of the long-duration low-amplitude pulse current is greater than that of the short-duration high-amplitude pulse current.

[0015] In one embodiment, the above-mentioned control of the control switches corresponding to each battery in the battery pack being closed or opened according to the target control strategy, and the adjustment of the heat generation of each battery in the battery pack, includes:

[0016] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0017] When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0018] The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to regulate the heat generation of each battery in the battery pack; wherein, the first preset duration is longer than the second preset duration.

[0019] In one embodiment, determining the target battery based on the internal resistance distribution information includes:

[0020] The internal resistance of each battery is sorted to obtain the sorting result;

[0021] Based on the sorting results of multiple batteries whose internal resistance meets the preset threshold, at least two candidate battery groups are determined.

[0022] The candidate battery packs are selected alternately to obtain the target battery pack, wherein the batteries in the target battery pack are the target batteries.

[0023] Secondly, this application also provides a battery system, which includes multiple batteries connected in parallel and a control unit, with a control switch provided in the branch where each battery is located;

[0024] The control unit is used to determine the target control strategy based on the predetermined state information of the battery pack;

[0025] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0026] Thirdly, this application also provides a battery pack internal resistance adjustment device, the device comprising:

[0027] The strategy determination module is used to determine the target control strategy based on the pre-determined state information of the battery pack;

[0028] The internal resistance adjustment module is used to control the control switches of each battery in the battery pack to close or open according to the target control strategy, and to adjust the heat generation of each battery in the battery pack in order to balance the internal resistance of each battery in the battery pack.

[0029] Fourthly, this application also provides an electronic device. The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0030] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0031] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0032] Fifthly, this application also provides a computer-readable storage medium. This computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0033] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0034] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0035] Sixthly, this application also provides a computer program product. This computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0036] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0037] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0038] The aforementioned battery pack internal resistance adjustment method, system, device, equipment, medium, and product determine a target control strategy based on pre-defined battery pack state information. According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack. This application adjusts the internal resistance by connecting control switches in series with each battery in the battery pack and using the switch control to generate pulse current, eliminating the need for complex screening equipment and thermal management system hardware, thus significantly reducing equipment costs. Attached Figure Description

[0039] Figure 1 This is a diagram illustrating the application environment of a battery pack internal resistance adjustment method in one embodiment.

[0040] Figure 2 This is a flowchart illustrating a battery pack internal resistance adjustment method in one embodiment;

[0041] Figure 3 This is a schematic diagram of the process for adjusting the heat generation of each battery in a battery pack in one embodiment;

[0042] Figure 4 This is a schematic diagram of the switch state in one embodiment;

[0043] Figure 5 This is a schematic diagram of the battery current in one embodiment;

[0044] Figure 6 This is a schematic diagram illustrating the process of adjusting the heat generation of each battery in the battery pack in another embodiment;

[0045] Figure 7 This is a schematic diagram of the pulse process in the second regulation strategy in one embodiment;

[0046] Figure 8 This is a schematic diagram illustrating the current and temperature distribution of a battery in one embodiment;

[0047] Figure 9 This is a schematic diagram illustrating the determination of a target battery based on internal resistance distribution information in one embodiment.

[0048] Figure 10 This is a structural block diagram of a battery pack internal resistance adjustment device in one embodiment;

[0049] Figure 11 This is a diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0051] First, before introducing the technical solutions of the embodiments of this application in detail, the technical background on which the embodiments of this application are based will be introduced.

[0052] Differences in battery aging and temperature will manifest as inconsistencies in internal resistance. In parallel systems, these inconsistencies in battery internal resistance will cause significant current differences at the end of charging and discharging. This phenomenon will lead to a rapid increase in battery temperature, potentially causing thermal runaway. At the same time, the large current may also cause over-discharge of the battery and accelerate battery aging.

[0053] Internal resistance uniformity control is primarily used in battery management systems, especially for multiple battery cells in parallel battery packs or series battery clusters. Due to differences in manufacturing tolerances, usage conditions, and aging rates, even batteries of the same model and batch can have varying internal resistances. Inconsistent internal resistance among cells within a battery pack leads to uneven current distribution, thus affecting the overall performance and lifespan of the battery pack. Therefore, employing appropriate internal resistance uniformity control methods is crucial for maintaining battery pack performance, improving its reliability, and extending its lifespan.

[0054] Common strategies for controlling internal resistance uniformity include: 1) Battery matching: Before assembling the battery pack, individual batteries are rigorously screened and matched, selecting battery cells with similar internal resistance to assemble into the battery pack. This pre-screening can reduce performance differences among batteries within the battery pack. 2) Active balancing technology: Active balancing technology is used to manage the charging and discharging of batteries in the battery pack, improving internal resistance differences caused by different states of charge (SOC) by balancing the battery's state of charge. 3) Thermal management system control: Maintaining temperature uniformity within the battery pack. Since internal resistance is significantly affected by temperature, maintaining temperature uniformity in the battery pack can effectively reduce internal resistance unevenness caused by temperature differences. This can be achieved through heating or cooling systems and insulation measures.

[0055] Battery matching screening can significantly reduce the impact of internal resistance differences in the early stages of use, but its effectiveness gradually diminishes with increasing usage time, requiring synergy with control methods during use. Active equalization technology to improve internal resistance differences requires a relatively high degree of battery uniformity. Temperature control technology also necessitates the support of a complex thermal management system.

[0056] Based on this, this application provides a method, system, device, equipment, medium, and product for adjusting the internal resistance of a battery pack, aiming to solve the above-mentioned technical problems.

[0057] The battery pack internal resistance adjustment method provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, the battery system 01 includes multiple batteries 1 connected in parallel and a control unit 2. Each branch of the battery 1 is equipped with a control switch 10. The control unit 2 is used to determine a target control strategy based on the predetermined state information of the battery pack; according to the target control strategy, it controls the control switch corresponding to each battery in the battery pack to close or open, and adjusts the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack.

[0058] In one exemplary embodiment, such as Figure 2 As shown, this application provides a method for adjusting the internal resistance of a battery pack, which can be applied to... Figure 1 Taking the terminal in the example, the explanation includes the following steps:

[0059] S201, based on the predetermined state information of the battery pack, determines the target control strategy.

[0060] The status information can include parameters such as the internal resistance, temperature, charge level, and open-circuit voltage of each battery in the battery pack. This information is used to determine the current status of the battery pack and the required control strategy.

[0061] This application embodiment uses sensors installed in the battery pack to monitor parameters such as internal resistance, temperature, voltage, and current of each battery in real time. These parameters are transmitted to the processor in the terminal, which analyzes this state information according to a preset algorithm to determine the current state of the battery pack.

[0062] For example, if a large difference in internal resistance is found in the battery pack and the charging requirements of different batteries are the same, then control strategy one is adopted; if the charging requirements of different batteries are different, then control strategy two is adopted.

[0063] Another approach is to periodically perform offline testing on the battery pack, measuring the state parameters of each battery. The measurement results are then input into computer software for analysis to determine the battery pack's state information and target control strategies. This method is suitable for scenarios where battery pack state monitoring requirements are not stringent.

[0064] S202, according to the target control strategy, controls the control switch corresponding to each battery in the battery pack to close or open, and adjusts the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack.

[0065] Among them, the target control strategy refers to the specific method determined based on the state information of the battery pack for adjusting the non-uniformity of the internal resistance of the battery pack, including but not limited to control strategies for different charging requirements.

[0066] Heat generation refers to the heat generated by the current passing through the battery during operation. Heat generation is related to factors such as the magnitude of the current and the duration of power flow.

[0067] In this embodiment, when it is determined that a battery in the battery pack has a high internal resistance and requires increased temperature to reduce its internal resistance, the control switch corresponding to that battery is set to a short-duration high-amplitude pulse mode. This means the switch closes and opens rapidly, allowing a high-amplitude current to pass through the battery in a short period, increasing heat generation. The switches corresponding to other batteries with lower internal resistance are set to a long-duration low-amplitude pulse mode, allowing a lower-amplitude current to pass through for a longer period, ensuring the charged capacity is the same as the battery with higher internal resistance, but with relatively lower heat generation. In this way, the temperature of the battery with higher internal resistance increases, and its internal resistance decreases, achieving uniformity of internal resistance.

[0068] Another implementation: Suppose that one battery in the battery pack has a low open-circuit voltage and low charge due to high internal resistance, requiring increased charging to reduce its internal resistance. Set the control switch corresponding to this battery to a longer energizing time, for example, continuously energizing for a period followed by intermittent brief disconnections, to increase heat generation and charging. The switches corresponding to other batteries use intermittent energizing times to reduce charging. This method regulates the heat generation and internal resistance of each battery.

[0069] Specifically, this application regulates the pulse current by installing current control switches in parallel branch circuits to control the number of individual battery cells participating in the parallel current distribution. For batteries with high internal resistance, controlling the closing of their switches increases the root mean square value of the current, thereby increasing the battery temperature and reducing the internal resistance.

[0070] When there is a difference in internal resistance, the unevenness of internal resistance can be reduced by actively changing the temperature of the individual battery cells. The equations for the heat and temperature change of the battery are shown in formula (1), where h is the natural convection heat dissipation coefficient of the air, A is the heat dissipation surface area of ​​the battery, C is the specific heat capacity of the battery, and m is the mass of the battery.

[0071] (1)

[0072] To achieve internal resistance control through temperature differences between batteries, one can approach the issue from two directions: heat generation and heat dissipation. Existing methods for internal resistance homogenization in thermal management involve designing the battery's heat dissipation system to regulate heat dissipation, thereby creating temperature differences between batteries and achieving uniform internal resistance control. This method can effectively regulate significant current differences at the battery terminals, but its limitation lies in the design of the external heat dissipation system. To achieve different heat dissipation conditions for different batteries, complex external heat dissipation systems need to be designed for each battery, significantly increasing the manufacturing and operating costs of the battery system.

[0073] The aforementioned battery pack internal resistance adjustment method, system, device, equipment, medium, and product determine a target control strategy based on pre-defined battery pack state information. According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack. This application achieves uniform battery management by adjusting the heat generation of each battery in the battery pack. Its key lies in adding current switches to the parallel units in the parallel battery system, controlling the number of parallel batteries through the switches, and rapidly and periodically adjusting the parameter differences between batteries in a pulse manner. This avoids the complex heat dissipation system design and costly thermal management components and operating costs associated with parallel battery systems.

[0074] In an exemplary embodiment, based on the above embodiments, the state information of this application embodiment includes the operating time, open-circuit voltage, and initial charge of each battery. Based on the predetermined state information of the battery pack, a target control strategy is determined, including the following steps:

[0075] When the battery operating time, open-circuit voltage, and initial charge meet the same triggering condition as the charge amount, the first regulation strategy is determined as the target regulation strategy.

[0076] The first regulation strategy refers to the regulation strategy adopted when the battery working time, open circuit voltage and initial charge meet the same trigger condition of charging amount. It can be used to regulate the pulse current of each battery in the battery pack.

[0077] This application embodiment monitors the operating time, open-circuit voltage, and initial charge of each battery in the battery pack in real time. Specific thresholds and judgment conditions are set. When the operating time differences among all batteries are within a certain range, their open-circuit voltages are similar, and their initial charges are basically the same, the trigger condition for equal charge is considered met, and the first control strategy is determined as the target control strategy. When the differences in operating time, open-circuit voltage, and initial charge between batteries are large, it indicates that the charging needs of different batteries are different, meeting the trigger condition for different charge amounts, and the second control strategy is determined as the target control strategy.

[0078] Another approach is to periodically inspect the battery pack to obtain data on the operating time, open-circuit voltage, and initial charge of each battery. Based on historical data and experience, a decision-making model is established. The detected state information is input into the model, and the model outputs the appropriate control strategy. For example, machine learning algorithms can be used to automatically determine which control strategy to employ under different state conditions by learning from a large amount of historical data.

[0079] When the battery operating time, open circuit voltage, and initial charge meet different triggering conditions for charging amount, the second regulation strategy is determined as the target regulation strategy.

[0080] The second control strategy refers to the control strategy adopted when the battery working time, open circuit voltage and initial charge meet different trigger conditions for charging amount, and can be used to control the charging time of each battery.

[0081] In this embodiment of the application, when the second control strategy is determined to be adopted, the charging time of batteries that require increased charging capacity and reduced internal resistance is extended. This can be achieved by controlling the switch corresponding to that battery to remain closed for a longer period, allowing the battery to charge continuously, thereby increasing heat generation and charging capacity. For other batteries, intermittent charging times are used to reduce the charging capacity. Simultaneously, the changes in the charge and internal resistance of each battery are monitored, and the charging time is dynamically adjusted according to these changes.

[0082] Another implementation method: When adopting the second control strategy, the charging time can be adjusted in conjunction with other factors, such as the battery temperature and degree of aging. For example, for batteries with higher temperatures or more severe aging, the charging time can be appropriately shortened to avoid overheating and excessive aging.

[0083] This application's embodiments determine the target control strategy based on battery operating time, open-circuit voltage, and initial charge status information, enabling more precise adjustment of the battery pack's internal resistance to meet diverse charging needs. The first and second control strategies are optimized for the same and different charging amounts, respectively, improving the battery pack's charging efficiency and energy utilization.

[0084] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 3 According to the target control strategy, this application embodiment controls the control switches corresponding to each battery in the battery pack to close or open, and adjusts the heat generation of each battery in the battery pack, including the following steps:

[0085] S301, Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information.

[0086] Internal resistance distribution information refers to the magnitude and distribution characteristics of the internal resistance of each cell in the battery pack, obtained through measurement or calculation. The target cell refers to a cell that requires specific adjustments based on the internal resistance distribution information; it is typically a cell with high internal resistance or a significant difference in internal resistance compared to other cells.

[0087] This application embodiment uses professional internal resistance measurement equipment to periodically measure the internal resistance of each battery in the battery pack, obtaining internal resistance distribution information. Based on a preset internal resistance difference threshold, batteries with higher internal resistance are identified as target batteries. For example, if the internal resistance of a certain battery is higher than the average internal resistance of the battery pack by a certain proportion, it is identified as a target battery.

[0088] Another implementation method involves monitoring parameters such as voltage and current during the charging and discharging process of the battery pack, and using a specific algorithm to estimate the internal resistance distribution of each battery. Based on the magnitude of the internal resistance, the batteries with the highest internal resistance are selected as target batteries.

[0089] S302, when the target control strategy is the first control strategy, controls the control switch corresponding to each battery in the battery pack to close; and inputs a short-time high-amplitude pulse current to the target battery and a long-time low-amplitude pulse current to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack.

[0090] Among them, short-time high-amplitude pulse current refers to a pulse current with a high current amplitude but a short duration, which is used to increase the temperature of the target battery to reduce its internal resistance.

[0091] Long-duration low-amplitude pulse current refers to a pulse current with a relatively low amplitude but a long duration, used to ensure that other batteries are charged to the same amount of power as the target battery but generate relatively less heat. Short-duration high-amplitude pulse current has a higher pulse amplitude than long-duration low-amplitude pulse current, and the input duration of long-duration low-amplitude pulse current is longer than that of short-duration high-amplitude pulse current.

[0092] In this embodiment, when the first control strategy is determined to be adopted, the control switches corresponding to each battery in the battery pack are simultaneously closed by the electronic control system. Then, a pulse current generator outputs a short-duration, high-amplitude pulse current to the target battery and a long-duration, low-amplitude pulse current to the other batteries. The parameters of the pulse current, such as pulse amplitude, duration, and frequency, can be adjusted according to actual conditions to achieve the best internal resistance regulation effect. Simultaneously, the temperature and internal resistance changes of the battery pack are monitored in real time, and the parameters of the pulse current are dynamically adjusted according to the changes.

[0093] Another implementation method: When using the first control strategy, a time-sharing control approach can be adopted. First, close the control switches of all batteries and input a long-duration, low-amplitude pulse current to the other batteries for a period of time. Then, close the control switch of the target battery individually and input a short-duration, high-amplitude pulse current. Repeat this process until the desired internal resistance regulation effect is achieved.

[0094] Taking a parallel system consisting of three battery cells as an example, let's assume battery 1 has a relatively high internal resistance, while batteries 2 and 3 have relatively low internal resistances. To achieve uniform control of the battery internal resistance, according to the law of battery internal resistance changing with temperature, the temperature of battery 1 needs to be increased. In the pulse control strategy, the number of batteries in the parallel system will change by controlling the current switches of batteries 1, 2, and 3 during the pulse control process. The battery temperature is adjusted while keeping the total current entering the parallel battery system constant.

[0095] The first control strategy is to keep the amount of charge on each battery the same (for example, if the three battery packs have not been used for a long time, the open circuit voltage is equal, the initial charge is the same, and it is required that the charge on each battery is the same during operation).

[0096] Battery 1 uses short-duration, high-amplitude pulses, while batteries 2 and 3 use long-duration, low-amplitude pulses. This switching control method ensures that batteries 1, 2, and 3 are charged with the same amount of power. However, the root mean square current of battery 1 is higher than that of batteries 2 and 3, leading to increased heat generation, higher temperature, and decreased internal resistance in battery 1. The corresponding switching states are as follows: Figure 4 As shown, battery current and Figure 5 .

[0097] The control method achieves the following functions, as shown in formulas (2) and (3):

[0098] (2)

[0099] (3)

[0100] According to the above formula (1), the heat generated by battery 1 is higher than that of battery 2 and battery 3, and the temperature rise of battery 1 is higher, which reduces its internal resistance and achieves uniform internal resistance.

[0101] This application's embodiments determine the target battery by acquiring internal resistance distribution information, enabling targeted regulation of batteries with high internal resistance and improving the efficiency and effectiveness of internal resistance adjustment. By using different pulse currents to separately regulate the target battery and other batteries, the heat generation and charging amount of each battery can be precisely controlled, achieving uniformity of the battery pack's internal resistance. Balancing the battery pack's internal resistance avoids issues such as circulating current and current differences at the end of charging and discharging, improving the battery pack's performance and safety, and extending its lifespan.

[0102] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 6 This application embodiment relates to the process of controlling the closing or opening of the control switch corresponding to each battery in the battery pack according to the target control strategy, and adjusting the heat generation of each battery in the battery pack, including the following steps:

[0103] S401, Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information.

[0104] This application embodiment uses a high-precision internal resistance tester to measure the internal resistance of each battery in the battery pack, obtaining internal resistance distribution information. Based on a pre-set internal resistance difference standard, batteries with internal resistance significantly higher than the average internal resistance are identified as target batteries. For example, if the internal resistance of a battery is a certain percentage higher than the average internal resistance of the battery pack, it is identified as a target battery.

[0105] Another implementation method involves monitoring the voltage and current changes of the battery pack during charging and discharging, and combining this with the battery's characteristic parameters to estimate the internal resistance distribution of each battery using a specific algorithm. The batteries are then sorted according to their internal resistance, and the top few with the highest internal resistance are selected as candidate target batteries. Finally, other factors, such as the remaining capacity of the batteries, are considered to determine the final target battery.

[0106] S402, when the target control strategy is the second control strategy, control the control switches corresponding to each battery in the battery pack to close; and control the control switch corresponding to the target battery to close for a first preset time, and control the control switches corresponding to other batteries in the battery pack to close for a second preset time, so as to adjust the heat generation of each battery in the battery pack.

[0107] The first preset duration refers to the length of time the control switch corresponding to the target battery is closed, which is relatively long in order to increase the heat generation and charging amount of the target battery.

[0108] The second preset duration refers to the length of time that the control switches for other batteries in the battery pack are closed. It is relatively short to control the charging amount of other batteries. The first preset duration is longer than the second preset duration.

[0109] In this embodiment, when the second control strategy is determined to be adopted, the electronic control system simultaneously controls the closing of the control switches corresponding to all batteries in the battery pack. Then, according to preset time parameters, the control switch of the target battery is kept closed for a first preset duration, during which the target battery continues to charge, increasing heat generation. Simultaneously, the control switches of other batteries are closed for a second preset duration, which is shorter than the first preset duration, to control the charging amount of the other batteries. Throughout the process, parameters such as the temperature, voltage, and current of the battery pack can be monitored in real time, and the first and second preset durations can be dynamically adjusted according to the actual situation.

[0110] Another implementation method is to use a cyclic control approach. The charging process of the battery pack is divided into multiple time periods. Within each time period, the control switches of all batteries are first closed for a certain period, then the control switch of the target battery is closed for a first preset duration, and then the control switches of the other batteries are closed for a second preset duration. This cyclic process is repeated until the desired internal resistance adjustment effect is achieved. Simultaneously, the ratio of the first preset duration to the second preset duration can be gradually adjusted according to changes in the state of the battery pack.

[0111] Specifically, the second control strategy is to maintain a different amount of charge on each battery. (For example, if three batteries have been operating in parallel for a period of time, under the same terminal voltage, battery 1 has a lower open-circuit voltage and less charge due to its higher internal resistance, and can be charged with more charge.)

[0112] Battery 1 uses a longer power-on time, while batteries 2 and 3 use intermittent power-on times. Battery 1 has a longer current-on time during the pulse phase, which increases the heat generated by battery 1 and consequently raises its temperature.

[0113] The total current I remains constant, and the relationship between the currents of the three batteries is I = I1 + I2 + I3. For example... Figure 7 As shown, during the pulse process, the switches of batteries 1, 2, and 3 remain initially closed. During the time intervals t0 to t1, the switch of battery 3 is opened, allowing battery 1 and battery 2 to charge in parallel. During the time intervals t1 to t2, the switch of battery 2 is opened, allowing battery 1 and battery 3 to discharge in parallel. This process is repeated to achieve a pulse cycle. Since the total current remains constant, the current through battery 1 increases compared to no pulse control. Compared to batteries 2 and 3, the on-time of battery 1 increases, thereby increasing heat generation and raising the temperature, thus achieving internal resistance regulation.

[0114] The duration of the pulse phase is 3600s. The specific description of the pulse process is as follows, where the switching cycles of battery 2 and battery 3 are each 20s. The simulated current and temperature distribution of the three batteries is as follows. Figure 8 As shown.

[0115] This application embodiment, through a second control strategy, can precisely control the charging time of the target battery and other batteries based on the internal resistance distribution of the battery pack, achieving differentiated adjustment of the charging amount of different batteries and meeting their charging needs. By increasing the charging time and heat generation of the target battery, its temperature can be increased, thereby reducing its internal resistance. Simultaneously, controlling the charging amount of other batteries avoids overcharging, helping to maintain the overall performance and safety of the battery pack. Balancing the internal resistance of each battery in the battery pack reduces problems such as overcharging, over-discharging, and thermal runaway caused by differences in internal resistance, extending the battery pack's lifespan.

[0116] The method described in this application embodiment is also applicable to a three-cell battery configuration where one cell has a lower internal resistance than the other two. Using a first control strategy: alternately controlling the two cells with higher internal resistance as battery 1, the heat generation of the two cells with initially higher internal resistance increases, leading to a rise in temperature and a decrease in internal resistance. Using a second control strategy: alternately controlling the two cells with higher internal resistance as battery 1, the heat generation of the two cells with initially higher internal resistance increases, leading to a rise in temperature and a decrease in internal resistance.

[0117] The method described in this application embodiment is also applicable to three-cell batteries with high, medium, and low internal resistance distributions. Using the first control strategy: alternately controlling the batteries with high and medium internal resistance as battery 1, the heat generation of the two batteries with initially high internal resistance increases, their temperature rises, and their internal resistance decreases. The control time for the battery with high internal resistance as battery 1 is longer, while the control time for the battery with medium internal resistance as battery 1 is shorter, thus achieving uniform internal resistance across the three batteries. The method using the second control strategy is the same as the method using the first control strategy.

[0118] The method described in this application is also applicable to the regulation process of multiple batteries, similar to the regulation process of three batteries. During the regulation process, different pulse currents are generated for different batteries based on their internal resistance distribution. When the same charging amount is required for different batteries, regulation strategy one is adopted: short-duration, high-amplitude pulses are used for batteries that require increased temperature and reduced internal resistance, while long-duration, low-amplitude pulses are used for other batteries (increasing the number of batteries increases the degree of freedom in regulation; the implementation example in this application is only one typical solution). When different charging amounts are required for different batteries, regulation strategy two is adopted: longer access time and charging amount are used for batteries that require increased charging amount and reduced internal resistance, while shorter access time and charging amount are used for other batteries (increasing the number of batteries increases the degree of freedom in regulation; the implementation example in this application is only one typical solution).

[0119] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 9 This application relates to the process of determining a target battery based on internal resistance distribution information, including the following steps:

[0120] S501 sorts the internal resistance of each battery to obtain the sorting result.

[0121] This application embodiment uses specialized internal resistance measurement equipment to measure the internal resistance of each battery in the battery pack, and transmits the measurement results to a computer system. The computer system uses algorithms such as quicksort to sort the internal resistance of each battery from smallest to largest or from largest to smallest, obtaining a sorting result. For example, the batteries can be sorted in ascending order of internal resistance, which facilitates the subsequent identification of batteries with larger internal resistance.

[0122] Another implementation method involves monitoring the voltage and current changes of the battery pack during charging and discharging, using a specific algorithm to estimate the internal resistance of each battery, and then sorting them. Simple algorithms such as bubble sort can be used for sorting, which is suitable for scenarios with limited computing resources.

[0123] S502, based on the sorting results of multiple batteries whose internal resistance meets the preset threshold, determine at least two candidate battery packs.

[0124] Candidate battery packs refer to a set of batteries that meet a preset threshold based on their internal resistance ranking results.

[0125] In this embodiment, a preset internal resistance threshold range can be established. For example, batteries with an internal resistance greater than a certain percentage of the average value can be identified as meeting the preset threshold. Based on the sorting results, multiple batteries with internal resistance within this threshold range are selected, and these batteries are grouped into at least two candidate battery groups. Grouping can be based on battery location, number, etc., to ensure that the batteries in each candidate battery group have similar internal resistance characteristics.

[0126] Another implementation method involves determining the internal resistance threshold range for different usage scenarios based on historical data and experience. The preset threshold is then dynamically adjusted considering the actual usage of the current battery pack, such as charging / discharging modes and ambient temperature. Candidate battery packs are then selected based on the adjusted thresholds, improving the accuracy and adaptability of the candidate battery packs.

[0127] S503, alternately select candidate battery packs to obtain the target battery pack.

[0128] The target battery pack refers to the battery pack that needs to be specifically controlled after being determined through alternating selection, and the batteries in the target battery pack are the target batteries.

[0129] This application embodiment can set an alternating selection rule, such as selecting candidate battery packs in turn according to their numerical order. Each time a selection is made, the selected candidate battery pack is determined as the target battery pack. A time interval or a number of charge-discharge cycles can be set as the trigger condition for alternating selection, ensuring that different candidate battery packs have a chance to be selected as the target battery pack for regulation.

[0130] Another implementation method involves dynamically adjusting the alternating selection rules based on the real-time state parameters of the battery pack, such as temperature and voltage change rate. When the state parameters of a candidate battery pack meet specific conditions, that candidate battery pack is preferentially selected as the target battery pack. For example, if the temperature of a candidate battery pack rises rapidly, it may be necessary to prioritize its internal resistance control; in this case, that pack can be selected as the target battery pack in advance.

[0131] This application's embodiments, through sorting internal resistance and screening using preset thresholds, can accurately identify the target battery requiring adjustment, improving the targeting and effectiveness of internal resistance regulation. Identifying candidate battery packs and performing alternating selection makes internal resistance adjustment more flexible and comprehensive. The most suitable battery pack can be selected for regulation based on different usage scenarios and battery pack states, improving the overall performance and stability of the battery pack. Balancing the internal resistance of each battery in the pack reduces problems such as overcharging, over-discharging, and thermal runaway caused by differences in internal resistance, extending the battery pack's lifespan.

[0132] In one exemplary embodiment, based on the above embodiments, the method further includes:

[0133] Step 1: Under the condition that the battery working time, open circuit voltage and initial charge meet the same triggering condition of charging amount, the first regulation strategy is determined as the target regulation strategy;

[0134] Step 2: When the battery working time, open circuit voltage, and initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy.

[0135] Step 3: Sort the internal resistance of each battery to obtain the sorting result; determine at least two candidate battery groups based on the multiple batteries whose internal resistance meets the preset threshold in the sorting result; alternately select the candidate battery groups to obtain the target battery in the target battery group.

[0136] Step 4: When the target control strategy is the first control strategy, control the closing of the control switch corresponding to each battery in the battery pack; and input a short-term high-amplitude pulse current to the target battery and a long-term low-amplitude pulse current to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack.

[0137] Step 5: When the target control strategy is the second control strategy, control the control switches corresponding to each battery in the battery pack to close; and control the control switch corresponding to the target battery to close for a first preset time, and control the control switches corresponding to other batteries in the battery pack to close for a second preset time, so as to adjust the heat generation of each battery in the battery pack.

[0138] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0139] Based on the same inventive concept, this application also provides a battery system, please continue to refer to... Figure 1 The battery system 01 includes multiple batteries 1 connected in parallel and a control unit 2, and each branch of the battery 1 is equipped with a control switch 10.

[0140] Control unit 2 is used to determine the target control strategy based on the predetermined state information of the battery pack; according to the target control strategy, it controls the control switch corresponding to each battery in the battery pack to close or open, and adjusts the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack.

[0141] In this embodiment, the control unit can install sensors in the battery system to monitor parameters such as the internal resistance, temperature, voltage, current, and operating time of each battery in real time, providing information about the battery pack's status. The sensors transmit these parameters to the control unit, which analyzes this status information according to a preset algorithm to determine the current state of the battery pack and the required control strategy.

[0142] When the state information of the battery pack meets the triggering conditions for the same charge level, such as similar operating time, open-circuit voltage, and initial charge of each battery, the control unit determines the first regulation strategy as the target regulation strategy. The first regulation strategy is used to regulate the pulse current of each battery in the battery pack. Short-duration high-amplitude pulse current is used for batteries that need to increase temperature and reduce internal resistance, while long-duration low-amplitude pulse current is used for other batteries.

[0143] When the battery pack's state information meets the trigger conditions for different charging amounts, such as significant differences in the operating time, open-circuit voltage, and initial charge of different batteries, the control unit determines the second regulation strategy as the target regulation strategy. The second regulation strategy is used to regulate the charging time of each battery, extending the charging time for batteries requiring increased charging and reduced internal resistance, while using intermittent charging times for other batteries.

[0144] According to the target control strategy, the control unit controls the control switches corresponding to each battery to close or open. For example, under the first control strategy, when a short-term high-amplitude pulse current needs to be input to a certain battery, the control unit quickly closes and opens the control switch corresponding to that battery; when a long-term low-amplitude pulse current needs to be input to other batteries, the control unit keeps the control switches corresponding to these batteries in a closed state for a longer period of time.

[0145] Under the second control strategy, the control unit controls the closing time of the control switch corresponding to each battery according to preset time parameters. For batteries that need increased charging capacity, the control unit closes their corresponding control switch for a longer time; for other batteries, the control unit closes their corresponding control switch for a shorter time.

[0146] The heat generation of each battery in the battery pack is adjusted by controlling the operation of the switch. Under the first control strategy, a short-duration high-amplitude pulse current increases the heat generation and temperature of the target battery, thereby reducing its internal resistance; a long-duration low-amplitude pulse current results in relatively lower heat generation in other batteries, while ensuring that the charged capacity is the same as that of the target battery. Under the second control strategy, extending the charging time of the target battery increases its heat generation and charge capacity, thereby reducing its internal resistance.

[0147] The aforementioned battery system, through the coordinated action of a control unit and a control switch, can automatically determine the target regulation strategy based on the battery pack's state information and precisely adjust the internal resistance of each battery. This avoids problems such as circulating current and current differences caused by inconsistent internal resistance, improving the performance and safety of the battery system. Compared to traditional battery internal resistance adjustment methods, this battery system requires no complex equipment or expensive materials; internal resistance adjustment can be achieved solely through control switches and a control unit, thus reducing costs.

[0148] Based on the same inventive concept, this application also provides a battery pack internal resistance adjustment device for implementing the battery pack internal resistance adjustment method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the battery pack internal resistance adjustment device provided below can be found in the limitations of the battery pack internal resistance adjustment method described above, and will not be repeated here.

[0149] In one embodiment, such as Figure 10 As shown, a battery pack internal resistance adjustment device 700 is provided, comprising:

[0150] The strategy determination module 701 is used to determine the target control strategy based on the pre-determined state information of the battery pack;

[0151] The internal resistance adjustment module 702 is used to control the control switches corresponding to each battery in the battery pack to close or open according to the target control strategy, and to adjust the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack.

[0152] In one embodiment, the aforementioned status information includes the operating time, open-circuit voltage, and initial charge of each battery; the strategy determination module includes:

[0153] The first strategy determination unit is used to determine the first regulation strategy as the target regulation strategy when the battery working time, open circuit voltage and initial charge meet the triggering conditions of the same charging amount; the first regulation strategy is used to regulate the pulse current of each battery in the battery pack.

[0154] The second strategy determination unit is used to determine the second control strategy as the target control strategy when the battery working time, open circuit voltage and initial charge meet different trigger conditions for charging amount; the second control strategy is used to control the charging time of each battery.

[0155] In one embodiment, the internal resistance adjustment module includes:

[0156] The first battery determination unit is used to acquire the internal resistance distribution information of each battery in the battery pack and determine the target battery based on the internal resistance distribution information.

[0157] The first switch control unit is used to control the closing of the control switches corresponding to each battery in the battery pack when the target control strategy is the first control strategy; and to input a short-time high-amplitude pulse current to the target battery and a long-time low-amplitude pulse current to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack; wherein the pulse amplitude of the short-time high-amplitude pulse current is higher than the pulse amplitude of the long-time low-amplitude pulse current, and the input duration of the long-time low-amplitude pulse current is greater than the input duration of the short-time high-amplitude pulse current.

[0158] In one embodiment, the internal resistance adjustment module includes:

[0159] The second battery determination unit is used to acquire the internal resistance distribution information of each battery in the battery pack and determine the target battery based on the internal resistance distribution information.

[0160] The second switch control unit is used to control the closing of the control switches corresponding to each battery in the battery pack when the target control strategy is the second control strategy; and to control the control switch corresponding to the target battery to close for a first preset duration, and control the control switches corresponding to other batteries in the battery pack to close for a second preset duration, so as to adjust the heat generation of each battery in the battery pack; wherein the first preset duration is longer than the second preset duration.

[0161] In one embodiment, the aforementioned root first battery determining unit includes:

[0162] The sorting subunit is used to sort the internal resistance of each battery to obtain the sorting result;

[0163] The candidate battery determination sub-unit is used to determine at least two candidate battery groups based on multiple batteries whose internal resistance meets a preset threshold in the sorting results.

[0164] A sub-unit is selected to perform an alternating selection process on candidate battery packs to obtain a target battery pack, wherein the batteries in the target battery pack are the target batteries.

[0165] Each module in the aforementioned battery pack internal resistance adjustment device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware form or independent of it, or stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.

[0166] In one embodiment, an electronic device is provided, which may be a control unit, and its internal structure diagram may be as follows: Figure 11 As shown, this electronic device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a method for adjusting the internal resistance of a battery pack. The display unit is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the electronic device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the electronic device, or external keyboards, touchpads, or mice, etc.

[0167] Those skilled in the art will understand that Figure 11The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0168] In one embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0169] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0170] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0171] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0172] When the battery operating time, open circuit voltage, and initial charge meet the triggering conditions of the same charging amount, the first regulation strategy is determined as the target regulation strategy; the first regulation strategy is used to regulate the pulse current of each battery in the battery pack.

[0173] When the battery operating time, open circuit voltage, and initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy; the second control strategy is used to control the charging time of each battery.

[0174] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0175] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0176] When the target control strategy is the first control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0177] A short-duration, high-amplitude pulse current is input to the target battery, and a long-duration, low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack.

[0178] The pulse amplitude of a short-duration high-amplitude pulse current is higher than that of a long-duration low-amplitude pulse current, and the input duration of a long-duration low-amplitude pulse current is greater than that of a short-duration high-amplitude pulse current.

[0179] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0180] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0181] When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0182] The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to regulate the heat generation of each battery in the battery pack; wherein, the first preset duration is longer than the second preset duration.

[0183] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0184] The internal resistance of each battery is sorted to obtain the sorting result;

[0185] Based on the sorting results of multiple batteries whose internal resistance meets the preset threshold, at least two candidate battery groups are determined.

[0186] The candidate battery packs are selected alternately to obtain the target battery pack, wherein the batteries in the target battery pack are the target batteries.

[0187] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0188] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0189] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0190] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0191] When the battery operating time, open circuit voltage, and initial charge meet the triggering conditions of the same charging amount, the first regulation strategy is determined as the target regulation strategy; the first regulation strategy is used to regulate the pulse current of each battery in the battery pack.

[0192] When the battery operating time, open circuit voltage, and initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy; the second control strategy is used to control the charging time of each battery.

[0193] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0194] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0195] When the target control strategy is the first control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0196] A short-duration, high-amplitude pulse current is input to the target battery, and a long-duration, low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack.

[0197] The pulse amplitude of a short-duration high-amplitude pulse current is higher than that of a long-duration low-amplitude pulse current, and the input duration of a long-duration low-amplitude pulse current is greater than that of a short-duration high-amplitude pulse current.

[0198] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0199] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0200] When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0201] The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to regulate the heat generation of each battery in the battery pack; wherein, the first preset duration is longer than the second preset duration.

[0202] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0203] The internal resistance of each battery is sorted to obtain the sorting result;

[0204] Based on the sorting results of multiple batteries whose internal resistance meets the preset threshold, at least two candidate battery groups are determined.

[0205] The candidate battery packs are selected alternately to obtain the target battery pack, wherein the batteries in the target battery pack are the target batteries.

[0206] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0207] Based on the predetermined state information of the battery pack, a target control strategy is determined;

[0208] According to the target control strategy, the control switches corresponding to each battery in the battery pack are closed or opened, and the heat generation of each battery in the battery pack is adjusted to balance the internal resistance of each battery in the battery pack.

[0209] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0210] When the battery operating time, open circuit voltage, and initial charge meet the triggering conditions of the same charging amount, the first regulation strategy is determined as the target regulation strategy; the first regulation strategy is used to regulate the pulse current of each battery in the battery pack.

[0211] When the battery operating time, open circuit voltage, and initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy; the second control strategy is used to control the charging time of each battery.

[0212] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0213] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0214] When the target control strategy is the first control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0215] A short-duration, high-amplitude pulse current is input to the target battery, and a long-duration, low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack.

[0216] The pulse amplitude of a short-duration high-amplitude pulse current is higher than that of a long-duration low-amplitude pulse current, and the input duration of a long-duration low-amplitude pulse current is greater than that of a short-duration high-amplitude pulse current.

[0217] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0218] Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information;

[0219] When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and...

[0220] The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to regulate the heat generation of each battery in the battery pack; wherein, the first preset duration is longer than the second preset duration.

[0221] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0222] The internal resistance of each battery is sorted to obtain the sorting result;

[0223] Based on the sorting results of multiple batteries whose internal resistance meets the preset threshold, at least two candidate battery groups are determined.

[0224] The candidate battery packs are selected alternately to obtain the target battery pack, wherein the batteries in the target battery pack are the target batteries.

[0225] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0226] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0227] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0228] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for adjusting the internal resistance of a battery pack, characterized in that, The method includes: When the battery operating time, open-circuit voltage, and initial charge meet the triggering condition of the same charging amount, the first regulation strategy is determined as the target regulation strategy; the first regulation strategy is used to regulate the pulse current of each battery in the battery pack. When the battery operating time, the open-circuit voltage, and the initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy; the second control strategy is used to control the charging time of each battery. Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information; When the target control strategy is the first control strategy, the control switches corresponding to each battery in the battery pack are closed; and... A short-duration high-amplitude pulse current is input to the target battery, and a long-duration low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack; wherein, the pulse amplitude of the short-duration high-amplitude pulse current is higher than the pulse amplitude of the long-duration low-amplitude pulse current, and the input duration of the long-duration low-amplitude pulse current is greater than the input duration of the short-duration high-amplitude pulse current; Alternatively, obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information; When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and... The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to adjust the heat generation of each battery in the battery pack; wherein the first preset duration is longer than the second preset duration.

2. The method according to claim 1, characterized in that, The step of determining the target battery based on the internal resistance distribution information includes: The internal resistances of each battery are sorted to obtain the sorting results; Based on the sorting results, at least two candidate battery groups are determined for multiple batteries whose internal resistance meets a preset threshold. The candidate battery packs are selected alternately to obtain the target battery pack, wherein the batteries in the target battery pack are the target batteries.

3. A battery system, characterized in that, The battery system includes multiple batteries and a control unit connected in parallel, and each branch of the battery is equipped with a control switch. The control unit is used to determine the first regulation strategy as the target regulation strategy when the battery working time, open circuit voltage and initial charge meet the same triggering condition of charging amount. The first regulation strategy is used to regulate the pulse current of each battery in the battery pack. When the battery operating time, the open circuit voltage, and the initial charge meet different triggering conditions for charging amount, the second control strategy is determined as the target control strategy; The second control strategy is used to control the charging time of each of the batteries; Obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information; When the target control strategy is the first control strategy, the control switch corresponding to each battery in the battery pack is closed. as well as, A short-duration high-amplitude pulse current is input to the target battery, and a long-duration low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack; wherein, the pulse amplitude of the short-duration high-amplitude pulse current is higher than the pulse amplitude of the long-duration low-amplitude pulse current, and the input duration of the long-duration low-amplitude pulse current is greater than the input duration of the short-duration high-amplitude pulse current; Alternatively, obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information; When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and... The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to adjust the heat generation of each battery in the battery pack; wherein the first preset duration is longer than the second preset duration.

4. A battery pack internal resistance adjustment device, characterized in that, The device includes: The strategy determination module is used to determine a first control strategy as the target control strategy when the battery operating time, open-circuit voltage, and initial charge meet the triggering condition of the same charging amount; the first control strategy is used to regulate the pulse current of each battery in the battery pack; when the battery operating time, open-circuit voltage, and initial charge meet the triggering condition of different charging amounts, a second control strategy is determined as the target control strategy; the second control strategy is used to regulate the charging time of each battery. An internal resistance adjustment module is used to acquire the internal resistance distribution information of each battery in the battery pack and determine the target battery based on the internal resistance distribution information. When the target control strategy is the first control strategy, the control switches corresponding to each battery in the battery pack are closed; and... A short-duration high-amplitude pulse current is input to the target battery, and a long-duration low-amplitude pulse current is input to other batteries in the battery pack to regulate the heat generation of each battery in the battery pack; wherein, the pulse amplitude of the short-duration high-amplitude pulse current is higher than the pulse amplitude of the long-duration low-amplitude pulse current, and the input duration of the long-duration low-amplitude pulse current is greater than the input duration of the short-duration high-amplitude pulse current; Alternatively, obtain the internal resistance distribution information of each battery in the battery pack, and determine the target battery based on the internal resistance distribution information; When the target control strategy is the second control strategy, the control switches corresponding to each battery in the battery pack are closed; and... The control switch corresponding to the target battery is closed for a first preset duration, and the control switches corresponding to other batteries in the battery pack are closed for a second preset duration, so as to adjust the heat generation of each battery in the battery pack; wherein the first preset duration is longer than the second preset duration.

5. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 2.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

7. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

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