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

Abstract

The invention relates to a battery pack internal resistance adjusting method and system, a device, equipment, a medium and a product, and the method comprises the steps: determining a target regulation strategy based on the predetermined state information of a battery pack; according to the target regulation and control strategy, control switches corresponding to all the batteries in the battery pack are controlled to be switched on or switched off, and the heat production amount of all the batteries in the battery pack is adjusted to balance the internal resistance of all the batteries in the battery pack. The batteries in the battery pack are respectively connected with the control switch in series, the internal resistance is adjusted by utilizing the pulse current generated by the switch control, complicated screening equipment and thermal management system hardware are not needed, and the equipment cost is greatly reduced.

Description

Technical Field

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

[0002] As the demand for energy storage continues to grow, battery packs have been widely used in many fields. However, parallel battery packs will cause many problems due to inconsistent internal resistance. Differences in battery aging status and temperature differences will be reflected in the inconsistency of internal resistance. In a parallel system, the inconsistency of battery internal resistance will cause significant current differences at the end of charge and discharge. This phenomenon will cause the battery temperature to rise rapidly, which may cause thermal runaway. At the same time, large currents may also cause over-discharge of the battery, aggravate battery aging, and seriously affect the life and safety of the battery pack.

[0003] The common internal resistance uniformity control strategy currently uses heat dissipation to maintain the temperature uniformity in the battery pack to reduce the internal resistance unevenness. However, the heat dissipation method usually requires the use of a complex heat dissipation system, which greatly increases the manufacturing and operating costs of the battery system. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack internal resistance adjustment method and system, device, equipment, medium and product that can reduce costs in response to the above technical problems.

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

[0006] Determining a target control strategy based on predetermined state information of the battery pack;

[0007] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

[0008] In one embodiment, the state information includes the battery operating time, open circuit voltage and initial power of each battery; based on the predetermined state information of the battery pack, determining the target control strategy includes:

[0009] When the battery working time, open circuit voltage and initial power meet the triggering conditions of the same charging capacity, the first control strategy is determined as the target control strategy; the first control strategy is used to control the pulse current of each battery in the battery pack;

[0010] When the battery operating time, open circuit voltage and initial power meet different trigger 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 switch corresponding to each battery in the battery pack is controlled to be closed or opened according to the target control strategy, and the heat generation of each battery in the battery pack is adjusted, including:

[0012] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

[0013] When the target control strategy is the first control strategy, controlling the control switches corresponding to the batteries in the battery pack to be 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 adjust 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.

[0015] In one embodiment, the above-mentioned control switch corresponding to each battery in the battery pack is controlled to be closed or opened according to the target control strategy, and the heat generation of each battery in the battery pack is adjusted, including:

[0016] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

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

[0018] The control switch corresponding to the target battery is controlled to close for a first preset time, and the control switches corresponding to other batteries in the battery pack are controlled to close for a second preset time to adjust the heat generation of each battery in the battery pack; wherein the first preset time is greater than the second preset time.

[0019] In one embodiment, the above-mentioned determining the target battery according to the internal resistance distribution information includes:

[0020] Sorting the internal resistance of each battery to obtain a sorting result;

[0021] Determine at least two candidate battery groups according to a plurality of batteries whose internal resistance meets a preset threshold in the sorting results;

[0022] The candidate battery groups are alternately selected to obtain a target battery group, wherein the batteries in the target battery group are target batteries.

[0023] In a second aspect, the present application further provides a battery system, the battery system comprising a plurality of batteries arranged in parallel and a control unit, wherein a control switch is provided in a branch where each battery is located;

[0024] A control unit, configured to determine a target control strategy based on predetermined state information of the battery pack;

[0025] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

[0026] In a third aspect, the present application further provides a battery pack internal resistance adjustment device, the device comprising:

[0027] A strategy determination module, used to determine a target control strategy based on predetermined battery pack status information;

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

[0029] In a fourth aspect, the present application further provides an electronic device. The electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0030] Determining a target control strategy based on predetermined state information of the battery pack;

[0031] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

[0032] In a fifth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0033] Determining a target control strategy based on predetermined state information of the battery pack;

[0034] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

[0035] In a sixth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0036] Determining a target control strategy based on predetermined state information of the battery pack;

[0037] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

[0038] The above-mentioned battery pack internal resistance adjustment method and system, device, equipment, medium and product determine the target control strategy based on the predetermined battery pack status information; according to the target control strategy, control the control switch corresponding to each battery in the battery pack to close or open, and adjust the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack. This application adjusts the internal resistance by controlling the switch to generate pulse current to control each battery in the battery pack, without the need for complex screening equipment and thermal management system hardware, which greatly reduces the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A diagram showing an application environment of a battery pack internal resistance adjustment method in one embodiment;

[0040] Figure 2 A schematic diagram of a flow chart of a method for adjusting internal resistance of a battery pack in one embodiment;

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

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

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

[0044] Figure 6 A schematic diagram of a process for regulating the heat generation of each battery in a battery pack in another embodiment;

[0045] Figure 7 A schematic diagram of a pulse process in a second regulation strategy in an embodiment;

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

[0047] Fig. 9 A schematic diagram of determining a target battery according to internal resistance distribution information in one embodiment;

[0048] Fig.10 is a structural block diagram of a battery pack internal resistance regulating device in one embodiment;

[0049] Fig.11 FIG. 4 is a diagram showing the internal structure of an electronic device in one embodiment. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] First of all, before specifically introducing the technical solution of the embodiments of the present application, the technical background based on the embodiments of the present application is introduced.

[0052] The differences in battery aging and temperature will be reflected in the inconsistency of internal resistance. In a parallel system, the inconsistency of battery internal resistance will cause significant current differences at the end of charge and discharge, which will cause the battery temperature to rise rapidly and may lead to thermal runaway. At the same time, large currents may also cause over-discharge of the battery and aggravate battery aging.

[0053] Internal resistance uniformity control is mainly 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 will have different internal resistances. The inconsistency of the internal resistance of the cells within the battery pack will lead to uneven current distribution, which will affect the performance and life of the entire battery pack. Therefore, adopting an appropriate internal resistance uniformity control method is crucial to maintaining the performance of the battery pack, improving its reliability and extending its service life.

[0054] The basic strategies for the common internal resistance uniformity control currently include: 1) Battery matching: Before assembling the battery pack, the individual batteries are strictly screened and matched, and battery cells with similar internal resistance are selected to assemble into a battery pack. This pre-screening can reduce the performance differences of the batteries within the battery pack. 2) Active balancing technology: Use active balancing technology to manage the charging and discharging of the batteries in the battery pack, and improve the internal resistance differences caused by different states of charge by balancing the battery state of charge (SOC). 3) Thermal management system control: Maintain temperature uniformity within the battery pack. Since the internal resistance is significantly affected by temperature, maintaining the uniform temperature of the battery pack can effectively reduce the internal resistance unevenness caused by temperature differences. This can be achieved through heating or cooling systems and insulation measures.

[0055] The screening of battery matching can significantly reduce the impact of battery internal resistance differences in the early stage of use, but it will gradually lose its effect as the use time increases, and needs to be coordinated with the control method during use. Active balancing technology improves internal resistance differences, which needs to be achieved when the battery itself has good consistency. Temperature control technology also requires the support of a complex thermal management system.

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

[0057] The battery pack internal resistance adjustment method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. The battery system 01 includes a plurality of batteries 1 and a control unit 2 arranged in parallel, and a control switch 10 is arranged in the branch where each battery 1 is located. The 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, the control switch corresponding to each battery in the battery pack is 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.

[0058] In an exemplary embodiment, Figure 2 As shown, the present application provides a method for adjusting the internal resistance of a battery pack, and the method is applied to Figure 1 The terminal in is used as an example to illustrate, including the following steps:

[0059] S201, determining a target control strategy based on predetermined battery pack status information.

[0060] The status information may 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] The embodiment of the present application installs sensors in the battery pack to monitor the internal resistance, temperature, voltage, current and other parameters of each battery in real time. These parameters are transmitted to the processor of the terminal, and the processor analyzes these status information according to a preset algorithm to determine the current status of the battery pack.

[0062] For example, if it is found that there is a large difference in internal resistance in the battery pack, and the charging requirements of different batteries are the same, it is determined to adopt regulation strategy one; if the charging requirements of different batteries are different, it is determined to adopt regulation strategy two.

[0063] Another implementation method: The battery pack can be tested offline regularly to measure the status parameters of each battery. The measurement results are input into computer software for analysis to determine the status information of the battery pack and the target control strategy. This method is suitable for scenarios where the requirements for battery pack status monitoring are not high.

[0064] S202, according to the target control strategy, control the control switch corresponding to each battery in the battery pack to be closed or opened, and adjust 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 a specific method for adjusting the internal resistance non-uniformity of the battery pack determined according to the state information 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 battery due to the passage of current during operation. The heat generation is related to factors such as current size and power-on time.

[0067] In the embodiment of the present application, when it is determined that a battery in the battery pack has a large internal resistance and needs to increase the temperature to reduce the internal resistance, the control switch corresponding to the battery is set to a short-term high-amplitude pulse mode, that is, the switch is quickly closed and opened, so that the battery passes a high-amplitude current in a short time, thereby increasing the heat generation. The switches corresponding to other batteries with smaller internal resistance are set to a long-term low-amplitude pulse mode, which passes a long-term low-amplitude current to ensure that the charged amount is the same as that of the battery with larger internal resistance, but the heat generation is relatively low. In this way, the temperature of the battery with larger internal resistance increases, the internal resistance decreases, and the internal resistance is homogenized.

[0068] Another implementation method: Assume that one of the batteries in the battery pack has a low open circuit voltage and low power due to its large internal resistance, and needs to increase the charge amount to reduce the internal resistance. Set the control switch corresponding to the battery to a longer power-on time, such as short-term intermittent power-on after a period of continuous power-on, to increase the heat generation and charge amount. The switches corresponding to other batteries use intermittent power-on time to reduce the charge amount. In this way, the heat generation and internal resistance of each battery are adjusted.

[0069] Specifically, the present application adjusts the pulse current by installing a current control switch in the parallel branch to control the number of individual battery packs participating in the parallel current distribution. For batteries with large internal resistance, the switch is controlled to close, increasing the RMS value of the current, thereby increasing the battery temperature and achieving the purpose of reducing the internal resistance.

[0070] When there is a difference in internal resistance, the temperature of the battery cells can be actively changed to reduce the internal resistance unevenness. The heat and temperature change equation of the battery is 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 the temperature difference between batteries and complete the internal resistance regulation, we can start from the two directions of heat generation and heat dissipation of the battery. The existing internal resistance homogenization thermal management method is to control the heat dissipation of the battery by designing the heat dissipation link of the battery, thereby creating temperature differences between batteries and achieving homogenization of internal resistance. This method can effectively regulate the significant current differences at the end, but its limitation lies in the design of the external heat dissipation system. In order to achieve different heat dissipation conditions for different batteries, it is necessary to design complex heat dissipation systems for different batteries, which greatly increases the manufacturing and operation costs of the battery system.

[0073] The above-mentioned battery pack internal resistance adjustment method and system, device, equipment, medium and product determine the target control strategy based on the predetermined battery pack status information; according to the target control strategy, the control switch corresponding to each battery in the battery pack is 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. The present application realizes uniform management of batteries by adjusting the heat generation of each battery in the battery pack. The key is to add a current switch to the parallel unit in the parallel battery system, control the number of parallel batteries through the switch, and quickly and periodically adjust the parameter differences between the batteries in a pulsed manner. Thereby avoiding the complex heat dissipation system design of the parallel battery system and the cost of thermal management components and operating costs.

[0074] In an exemplary embodiment, based on the above embodiment, the state information of the embodiment of the present application includes the working time, open circuit voltage and initial power of each battery. Based on the predetermined state information of the battery pack, determining the target control strategy includes the following steps:

[0075] When the battery operating time, open circuit voltage and initial power meet the triggering conditions of the same charging capacity, the first control strategy is determined as the target control strategy.

[0076] Among them, the first control strategy refers to the control strategy adopted when the battery working time, open circuit voltage and initial power meet the same trigger conditions of charging capacity, which can be used to control the pulse current of each battery in the battery pack.

[0077] The embodiment of the present application monitors the working time, open circuit voltage and initial power of each battery in the battery pack in real time. Specific thresholds and judgment conditions are set. When the working time differences of all batteries are within a certain range, the open circuit voltages are similar and the initial power is basically the same, it is considered that the trigger condition of the same charge amount is met, and the first control strategy is determined as the target control strategy. When the working time, open circuit voltage and initial power of the batteries differ greatly, indicating that the charging requirements of different batteries are different, and the trigger conditions of different charge amounts are met, the second control strategy is determined as the target control strategy.

[0078] Another implementation method is to regularly test the battery pack to obtain the working time, open circuit voltage and initial power data of each battery. Based on historical data and experience, a decision model is established, and the detected state information is input into the model, and the model outputs the control strategy to be adopted. For example, a machine learning algorithm can be used to automatically determine which control strategy should be adopted under different state information by learning a large amount of historical data.

[0079] When the battery operating time, open circuit voltage and initial power meet different trigger conditions of charging capacity, the second control strategy is determined as the target control strategy.

[0080] Among them, the second control strategy refers to the control strategy adopted when the battery working time, open circuit voltage and initial power meet different charging trigger conditions, which can be used to control the charging time of each battery.

[0081] When the second control strategy is determined to be adopted in the embodiment of the present application, the charging time of the battery that needs to increase the charge amount and reduce the internal resistance is extended. The battery can be continuously charged by controlling the switch corresponding to the battery to remain closed for a longer time, thereby increasing the heat generation and charge amount. For other batteries, intermittent charging time is adopted to reduce the charge amount. At the same time, the power and internal resistance changes of each battery are monitored, and the length of the charging time is dynamically adjusted according to the changes.

[0082] Another implementation method: When the second control strategy is adopted, the charging time can be adjusted in combination with other factors, such as the temperature and aging degree of the battery. 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] The embodiment of the present application determines the target control strategy based on the battery's operating time, open circuit voltage, initial power and other state information, and can more accurately adjust the internal resistance of the battery pack to meet different charging requirements. The first control strategy and the second control strategy are optimized for the same and different charging amounts, respectively, to improve the charging efficiency and energy utilization of the battery pack.

[0084] In an exemplary embodiment, based on the above embodiment, see Figure 3 According to the target control strategy, the embodiment of the present application controls the control switch corresponding to each battery in the battery pack to be closed or opened, and adjusts the heat generation of each battery in the battery pack, including the following steps:

[0085] S301, obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information.

[0086] The internal resistance distribution information refers to the size and distribution characteristics of the internal resistance of each battery in the battery pack, which is obtained by measurement or calculation. The target battery refers to the battery that needs to be specifically regulated according to the internal resistance distribution information, which is usually a battery with a large internal resistance or a large difference in internal resistance from other batteries.

[0087] The embodiment of the present application can use professional internal resistance measuring equipment to regularly measure the internal resistance of each battery in the battery pack to obtain internal resistance distribution information. According to the preset internal resistance difference threshold, the battery with larger internal resistance is determined as the target battery. For example, if the internal resistance of a battery is higher than the average internal resistance of the battery pack by a certain percentage, it is determined as the target battery.

[0088] Another embodiment can monitor the voltage, current and other parameters of the battery pack during the charging and discharging process, and use a specific algorithm to estimate the internal resistance distribution information of each battery. According to the internal resistance, the first few batteries with the largest internal resistance are selected as target batteries.

[0089] S302, when the target control strategy is the first control strategy, control switches corresponding to each battery in the battery pack are controlled to close; and short-duration high-amplitude pulse current is input to the target battery, and long-duration low-amplitude pulse current is input to other batteries in the battery pack to adjust the heat generation of each battery in the battery pack.

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

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

[0092] In the embodiment of the present application, when it is determined to adopt the first control strategy, the control switches corresponding to each battery in the battery pack are controlled by the electronic control system to close simultaneously. Then, a pulse current generator is used to output a short-term high-amplitude pulse current to the target battery and a long-term low-amplitude pulse current to 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. At the same time, 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 embodiment: When the first control strategy is adopted, a time-sharing control method can be adopted. First, the control switches of all batteries are closed, and a long low-amplitude pulse current is input to other batteries for a period of time, and then the control switch of the target battery is closed separately, and a short high-amplitude pulse current is input. Repeat this process until the desired internal resistance regulation effect is achieved.

[0094] Take a parallel system consisting of three battery cells as an example, assuming that battery 1 has a relatively large internal resistance, and battery 2 and battery 3 have relatively small internal resistances. In order to achieve uniform control of the battery internal resistance, the temperature of battery 1 needs to be increased according to the law that the battery internal resistance changes with temperature. In the pulse control strategy, the current switches of battery 1, battery 2, and battery 3 are controlled, so that the number of batteries in the parallel system changes during the pulse control process. The temperature of the battery is regulated while keeping the total current entering the parallel battery system unchanged.

[0095] The first control strategy is to keep the charged power of each battery the same (for example, if the three-cell battery pack has not been working for a long time, the open circuit voltage is equal, the initial power is the same, and the charged power of the battery during operation is required to be the same).

[0096] Battery 1 uses a short high-amplitude pulse, while battery 2 and battery 3 use a long low-amplitude pulse. This switch control method can make the amount of electricity charged to battery 1, battery 2 and battery 3 the same, but the RMS value of the current of battery 1 is higher than that of battery 2 and battery 3, the heat generation of battery 1 increases, the temperature rises, and the internal resistance decreases. The corresponding switch state is as follows Figure 4 As shown, the battery current and Figure 5 .

[0097] Among them, the control method realizes the following functions, as shown in formula (2) and formula (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] The embodiment of the present application determines the target battery by obtaining the internal resistance distribution information, and can specifically regulate the battery with larger internal resistance, thereby improving the efficiency and effect of internal resistance regulation. By using different pulse currents to regulate the target battery and other batteries separately, the heat generation and charge amount of each battery can be accurately controlled to achieve the homogenization of the internal resistance of the battery pack. Balancing the internal resistance of the battery pack can avoid the problem of battery circulation and current difference at the end of charging and discharging, improve the performance and safety of the battery pack, and extend the service life of the battery pack.

[0102] In an exemplary embodiment, based on the above embodiment, see Figure 6 The embodiment of the present application relates to a process of controlling the control switch corresponding to each battery in the battery pack to be closed or opened according to a target control strategy, and adjusting the heat generation of each battery in the battery pack, including the following steps:

[0103] S401, obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information.

[0104] The embodiment of the present application can use a high-precision internal resistance tester to measure the internal resistance of each battery in the battery pack to obtain internal resistance distribution information. According to the pre-set internal resistance difference standard, the battery with an internal resistance significantly higher than the average internal resistance is determined as the target battery. For example, if the internal resistance of a battery is higher than the average internal resistance of the battery pack by a certain percentage, it is identified as the target battery.

[0105] Another implementation method: By monitoring the voltage and current change curves of the battery pack during the charging and discharging process, combined with the characteristic parameters of the battery, a specific algorithm can be used to estimate the internal resistance distribution information of each battery. The batteries are sorted according to the internal resistance, and the first few batteries with larger internal resistance are selected as target battery candidates, and then the final target battery is determined in combination with other factors such as the remaining capacity of the battery.

[0106] S402, when the target control strategy is the second control strategy, controls the control switch corresponding to each battery in the battery pack to close; and controls the control switch corresponding to the target battery to close for a first preset time, and controls 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 that the control switch corresponding to the target battery is closed, which is relatively long so as to increase the heat generation and charging amount of the target battery.

[0108] The second preset time length refers to the length of time that the control switches corresponding to other batteries in the battery pack are closed, which is relatively short in order to control the charging amount of other batteries. The first preset time length is greater than the second preset time length.

[0109] In the embodiment of the present application, when it is determined to adopt the second control strategy, the control switches corresponding to all batteries in the battery pack are controlled to close simultaneously through the electronic control system. Then, according to the preset time parameters, the control switch of the target battery is controlled to remain closed for the first preset time, during which the target battery is continuously charged and the heat generation increases. At the same time, the control switches of other batteries are controlled to close for the second preset time, which is less than the first preset time, to control the charge amount of other batteries. During the whole process, the temperature, voltage, current and other parameters of the battery pack can be monitored in real time, and the first preset time and the second preset time can be dynamically adjusted according to the actual situation.

[0110] Another embodiment: a cyclic control method can be used. The charging process of the battery pack is divided into multiple time periods. In each time period, the control switches of all batteries are first controlled to be closed for a period of time, and then the control switches of the target battery are individually controlled to be closed for a first preset time, and then the control switches of other batteries are controlled to be closed for a second preset time. Repeat this cycle until the expected internal resistance regulation effect is achieved. At the same time, the ratio of the first preset time and the second preset time can be gradually adjusted according to the state change of the battery pack.

[0111] Specifically, the second control strategy is to keep the amount of electricity charged to each battery different. (For example, three batteries have been running in parallel for a period of time. Under the same terminal voltage, battery 1 has a lower open circuit voltage and less electricity because of its larger internal resistance, so it can be charged with more electricity).

[0112] Battery 1 uses a longer power-on time, while battery 2 and battery 3 use intermittent power-on time. Battery 1 has a longer current power-on time in the pulse stage, which increases the heat generation of battery 1 and thus increases its temperature.

[0113] The total current I remains unchanged, and the current magnitude relationship of the three batteries is I=I1+I2+I3. Figure 7 As shown, during the pulse process, the initial state of the switches of battery 1, battery 2, and battery 3 remains in the closed state. Take t0~t1 to disconnect the switch of battery 3, so that battery 1 and battery 2 are charged in parallel; take t1~t2 to disconnect the switch of battery 2, so that battery 1 and battery 3 are discharged in parallel. Continue to repeat the above process to achieve a pulse cycle. Since the total current remains unchanged, the current passing through battery 1 increases compared to not performing pulse control. Compared with batteries 2 and 3, the power-on time of battery 1 is increased, thereby increasing the heat generation to increase the temperature and achieve internal resistance regulation.

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

[0115] The embodiment of the present application uses the second control strategy to accurately control the charging time of the target battery and other batteries according to the internal resistance distribution of the battery pack, achieve differentiated regulation of the charging amount of different batteries, and meet the charging needs of different batteries. By increasing the charging time and heat generation of the target battery, its temperature can be increased, thereby reducing the internal resistance. At the same time, controlling the charging amount of other batteries to avoid overcharging helps 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 battery overcharging, over-discharging, and thermal runaway caused by differences in internal resistance, and extends the service life of the battery pack.

[0116] The method of the embodiment of the present application is also applicable to the case where one of the three batteries has a lower internal resistance than the other two batteries. Using the first control strategy: alternately controlling the two batteries with larger internal resistance as battery 1, the heat generation of the two batteries with higher initial internal resistance can be increased, the temperature can be increased, and the internal resistance can be decreased. Using the second control strategy: alternately controlling the two batteries with larger internal resistance as battery 1, the heat generation of the two batteries with higher initial internal resistance can be increased, the temperature can be increased, and the internal resistance can be decreased.

[0117] The method of the embodiment of the present application is also applicable to three batteries, and the internal resistance is distributed in high, medium and low. Using the first control strategy: alternately controlling the batteries with high internal resistance and medium internal resistance as battery 1, the heat generation of the two batteries with initially high internal resistance can be increased, the temperature can be increased, and the internal resistance can be reduced. Among them, the battery with high internal resistance is controlled as battery 1 for a longer time, and the battery with medium internal resistance is controlled as battery 1 for a shorter time, so that the internal resistance of the three batteries is uniform. The method of using the second control strategy is the same as the method of using the first control strategy.

[0118] The method of the embodiment of the present application is also applicable to the regulation process of multiple batteries, which is similar to the regulation process of three batteries. During the regulation process, different pulse currents are generated for different batteries according to the distribution of internal resistance. When the same charging amount is required for different batteries, regulation strategy one is adopted, and short-term high-amplitude pulses are used for batteries that need to increase the temperature and reduce the internal resistance of the battery, and long-term low-amplitude pulses are used for other batteries (the increase in the number of batteries will increase the degree of freedom of regulation, and the implementation case of this application is only one of the typical solutions). When different batteries are required to have different charging amounts, regulation strategy two is adopted, and longer access time and charging power are used for batteries that need to increase the charging amount and reduce the internal resistance, and shorter access time and charging power are used for other batteries (the increase in the number of batteries will increase the degree of freedom of regulation, and the implementation case of this application is only one of the typical solutions).

[0119] In an exemplary embodiment, based on the above embodiment, see Fig. 9 , the embodiment of the present application relates to a process of determining a target battery according to internal resistance distribution information, comprising the following steps:

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

[0121] In the embodiment of the present application, a professional internal resistance measuring device can be used to measure the internal resistance of each battery in the battery pack, and the measurement results can be transmitted to a computer system. The computer system uses a quick sorting algorithm to sort the internal resistance of each battery from small to large or from large to small to obtain a sorting result. For example, the internal resistance can be sorted in order from small to large, which is convenient for the subsequent determination of the battery with a larger internal resistance.

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

[0123] S502: Determine at least two candidate battery groups according to a plurality of batteries whose internal resistances meet a preset threshold in the sorting result.

[0124] The candidate battery group refers to a battery group consisting of multiple batteries that meet a preset threshold in the internal resistance sorting results.

[0125] In the embodiment of the present application, an internal resistance threshold range can be preset, for example, a battery whose internal resistance is greater than a certain percentage of the average value is determined as a battery that meets the preset threshold. According to the sorting result, multiple batteries with internal resistance within the threshold range are screened out, and these batteries are grouped into at least two candidate battery groups. The batteries can be grouped according to their position, number, etc., to ensure that the batteries in each candidate battery group have similar internal resistance characteristics.

[0126] Another embodiment: The internal resistance threshold range under different usage scenarios can be determined based on historical data and experience. Combined with the actual usage of the current battery pack, such as charging and discharging mode, ambient temperature and other factors, the preset threshold is dynamically adjusted. Then, the candidate battery pack is determined based on the adjusted threshold to improve the accuracy and adaptability of the candidate battery pack.

[0127] S503, performing alternate selection processing on the candidate battery groups to obtain a target battery group.

[0128] The target battery group refers to a battery group that is determined through alternating selection and needs to be specifically regulated, and the batteries in the target battery group are target batteries.

[0129] The embodiment of the present application may set a rule for alternating selection, for example, selecting in turn according to the number order of the candidate battery groups. In each selection, the selected candidate battery group is determined as the target battery group. A time interval or the number of charge and discharge cycles may be set as a trigger condition for alternating selection to ensure that different candidate battery groups have the opportunity to be selected as the target battery group for regulation.

[0130] Another embodiment: The rules for alternating selection can be dynamically adjusted according to the real-time state parameters of the battery pack, such as temperature, voltage change rate, etc. When the state parameters of a candidate battery pack meet specific conditions, the 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 preferentially regulate its internal resistance, in which case the group can be selected in advance as the target battery pack.

[0131] The embodiment of the present application can accurately determine the target battery that needs to be regulated by sorting the internal resistance and screening by preset thresholds, thereby improving the pertinence and effectiveness of the internal resistance regulation. The candidate battery packs are determined and alternately selected to make the internal resistance regulation more flexible and comprehensive. The most suitable battery pack can be selected for regulation according to different usage scenarios and battery pack status to improve the overall performance and stability of the battery pack. The internal resistance of each battery in the battery pack is balanced, reducing problems such as battery overcharging, over-discharging, and thermal runaway caused by differences in internal resistance, and extending the service life of the battery pack.

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

[0133] Step 1: When the battery operating time, open circuit voltage and initial power meet the same triggering condition of charging capacity, the first control strategy is determined as the target control strategy;

[0134] Step 2: When the battery operating time, open circuit voltage and initial power meet different trigger conditions of charging capacity, the second control strategy is determined as the target control strategy;

[0135] Step 3: sorting the internal resistance of each battery to obtain a sorting result; determining at least two candidate battery groups according to multiple batteries whose internal resistance meets a preset threshold in the sorting result; alternately selecting the candidate battery groups to obtain a target battery in the target battery group;

[0136] Step 4: When the target control strategy is the first control strategy, control switches corresponding to each battery in the battery pack are controlled to be closed; and short-duration high-amplitude pulse current is input to the target battery, and long-duration low-amplitude pulse current is input to other batteries in the battery pack to adjust 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 switch 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 various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0139] Based on the same inventive concept, the present application embodiment also provides a battery system, please continue to refer to Figure 1 The battery system 01 includes a plurality of batteries 1 and a control unit 2 arranged in parallel, and a control switch 10 is provided in each branch where the battery 1 is located.

[0140] The control unit 2 is used to determine a target regulation strategy based on predetermined battery pack status information; according to the target regulation strategy, control the control switches corresponding to each battery in the battery pack to be closed or opened, and adjust the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack.

[0141] In the embodiment of the present application, the control unit can install sensors in the battery system to monitor the internal resistance, temperature, voltage, current, working time and other parameters of each battery in real time as the status information of the battery pack. The sensor transmits these parameters to the control unit, and the control unit analyzes these status information according to a preset algorithm to determine the current state of the battery pack and the required control strategy.

[0142] When the status information of the battery pack meets the trigger conditions of the same charge amount, such as the working time, open circuit voltage and initial charge of each battery are similar, the control unit determines the first control strategy as the target control strategy. The first control strategy is used to control the pulse current of each battery in the battery pack, using short-term high-amplitude pulse current for batteries that need to increase temperature and reduce internal resistance, and long-term low-amplitude pulse current for other batteries.

[0143] When the battery pack status information meets the trigger conditions of different charging amounts, such as large differences in the working time, open circuit voltage and initial power of different batteries, the control unit determines the second control strategy as the target control strategy. The second control strategy is used to control the charging time of each battery, extending the charging time of batteries that need to increase the charging amount and reduce the internal resistance, and using intermittent charging time 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 battery, the control unit quickly closes and opens the control switch corresponding to the 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 the closed state for a long time.

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

[0146] By controlling the operation of the switch, the heat generation of each battery in the battery pack is adjusted. Under the first control strategy, a short-term high-amplitude pulse current will increase the heat generation of the target battery and increase the temperature, thereby reducing the internal resistance; a long-term low-amplitude pulse current will make the heat generation of other batteries relatively low, but ensure that the charged amount is the same as the target battery. Under the second control strategy, extending the charging time of the target battery will increase its heat generation and charge amount, thereby reducing the internal resistance.

[0147] The battery system described above can automatically determine the target control strategy based on the battery pack status information and accurately adjust the internal resistance of each battery through the synergistic effect of the control unit and the control switch. This avoids the battery circulation and current difference problems caused by inconsistent internal resistance, and improves the performance and safety of the battery system. Compared with traditional battery internal resistance adjustment methods, this battery system does not require complex equipment and expensive materials, and can achieve internal resistance adjustment only through control switches and control units, reducing costs.

[0148] Based on the same inventive concept, the embodiment of the present application also provides a battery pack internal resistance regulating device for implementing the battery pack internal resistance regulating method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery pack internal resistance regulating device embodiments provided below can refer to the limitations of the battery pack internal resistance regulating method above, and will not be repeated here.

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

[0150] A strategy determination module 701 is used to determine a target control strategy based on predetermined battery pack status information;

[0151] The internal resistance regulating module 702 is used to control the control switch corresponding to each battery in the battery pack to be closed or opened according to the target regulation strategy, and to regulate 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 state information includes the working time, open circuit voltage and initial power of each battery; the strategy determination module includes:

[0153] A first strategy determination unit is used to determine the first control strategy as the target control strategy when the battery operating time, open circuit voltage and initial power meet the trigger condition of the same charging capacity; the first control strategy is used to control 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 power meet different charging trigger conditions; 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] A first battery determination unit, configured to obtain internal resistance distribution information of each battery in the battery pack, and determine a target battery according to the internal resistance distribution information;

[0157] The first switch control unit is used to control the closure of the control switches corresponding to each battery in the battery pack when the target control strategy is the first control strategy; and input a short-time high-amplitude pulse current to the target battery and input a long-time low-amplitude pulse current to other batteries in the battery pack to adjust 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] a second battery determination unit, configured to obtain internal resistance distribution information of each battery in the battery pack, and determine a target battery according to the internal resistance distribution information;

[0160] The second switch control unit is used to control the control switch corresponding to each battery in the battery pack to close when the target control strategy is the second control strategy; 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; wherein the first preset time is greater than the second preset time.

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

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

[0163] A candidate battery determination subunit, configured to determine at least two candidate battery groups according to a plurality of batteries whose internal resistances meet a preset threshold in the sorting result;

[0164] The selection subunit is used to perform alternate selection processing on the candidate battery groups to obtain a target battery group, wherein the batteries in the target battery group are target batteries.

[0165] Each module in the above-mentioned battery pack internal resistance adjustment device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in an electronic device in the form of hardware, or can be stored in a memory in the electronic device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0166] In one embodiment, an electronic device is provided. The electronic device may be a control unit, and its internal structure diagram may be as shown in FIG. Fig.11 As shown. The electronic device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the electronic device is used to exchange information between the processor and the external device. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for adjusting the internal resistance of a battery pack is implemented. The display unit of the electronic device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the electronic device housing, or an external keyboard, touchpad or mouse.

[0167] Those skilled in the art will understand that Fig.11The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of 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 a different arrangement of components.

[0168] In one embodiment, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0169] Determining a target control strategy based on predetermined state information of the battery pack;

[0170] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

[0171] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0172] When the battery working time, open circuit voltage and initial power meet the triggering conditions of the same charging capacity, the first control strategy is determined as the target control strategy; the first control strategy is used to control the pulse current of each battery in the battery pack;

[0173] When the battery operating time, open circuit voltage and initial power meet different trigger 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, when the processor executes the computer program, the processor further implements the following steps:

[0175] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

[0176] When the target control strategy is the first control strategy, controlling the control switches corresponding to the batteries in the battery pack to be closed; and,

[0177] Inputting a short-duration high-amplitude pulse current to the target battery and inputting a long-duration low-amplitude pulse current to other batteries in the battery pack to adjust the heat generation of each battery in the battery pack;

[0178] 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 longer than the input duration of the short-time high-amplitude pulse current.

[0179] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0180] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

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

[0182] The control switch corresponding to the target battery is controlled to close for a first preset time, and the control switches corresponding to other batteries in the battery pack are controlled to close for a second preset time to adjust the heat generation of each battery in the battery pack; wherein the first preset time is greater than the second preset time.

[0183] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0184] Sorting the internal resistance of each battery to obtain a sorting result;

[0185] Determine at least two candidate battery groups according to a plurality of batteries whose internal resistance meets a preset threshold in the sorting results;

[0186] The candidate battery groups are alternately selected to obtain a target battery group, wherein the batteries in the target battery group are target batteries.

[0187] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0188] Determining a target control strategy based on predetermined state information of the battery pack;

[0189] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

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

[0191] When the battery working time, open circuit voltage and initial power meet the triggering conditions of the same charging capacity, the first control strategy is determined as the target control strategy; the first control strategy is used to control the pulse current of each battery in the battery pack;

[0192] When the battery operating time, open circuit voltage and initial power meet different trigger 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, the following steps are also implemented:

[0194] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

[0195] When the target control strategy is the first control strategy, controlling the control switches corresponding to the batteries in the battery pack to be closed; and,

[0196] Inputting a short-duration high-amplitude pulse current to the target battery and inputting a long-duration low-amplitude pulse current to other batteries in the battery pack to adjust the heat generation of each battery in the battery pack;

[0197] 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 longer than the input duration of the short-time high-amplitude pulse current.

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

[0199] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

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

[0201] The control switch corresponding to the target battery is controlled to close for a first preset time, and the control switches corresponding to other batteries in the battery pack are controlled to close for a second preset time to adjust the heat generation of each battery in the battery pack; wherein the first preset time is greater than the second preset time.

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

[0203] Sorting the internal resistance of each battery to obtain a sorting result;

[0204] Determine at least two candidate battery groups according to a plurality of batteries whose internal resistance meets a preset threshold in the sorting results;

[0205] The candidate battery groups are alternately selected to obtain a target battery group, wherein the batteries in the target battery group are target batteries.

[0206] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0207] Determining a target control strategy based on predetermined state information of the battery pack;

[0208] According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

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

[0210] When the battery working time, open circuit voltage and initial power meet the triggering conditions of the same charging capacity, the first control strategy is determined as the target control strategy; the first control strategy is used to control the pulse current of each battery in the battery pack;

[0211] When the battery operating time, open circuit voltage and initial power meet different trigger 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, the following steps are also implemented:

[0213] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

[0214] When the target control strategy is the first control strategy, controlling the control switches corresponding to the batteries in the battery pack to be closed; and,

[0215] Inputting a short-duration high-amplitude pulse current to the target battery and inputting a long-duration low-amplitude pulse current to other batteries in the battery pack to adjust the heat generation of each battery in the battery pack;

[0216] 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 longer than the input duration of the short-time high-amplitude pulse current.

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

[0218] Obtaining internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information;

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

[0220] The control switch corresponding to the target battery is controlled to close for a first preset time, and the control switches corresponding to other batteries in the battery pack are controlled to close for a second preset time to adjust the heat generation of each battery in the battery pack; wherein the first preset time is greater than the second preset time.

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

[0222] Sorting the internal resistance of each battery to obtain a sorting result;

[0223] Determine at least two candidate battery groups according to a plurality of batteries whose internal resistance meets a preset threshold in the sorting results;

[0224] The candidate battery groups are alternately selected to obtain a target battery group, wherein the batteries in the target battery group are 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, stored data, displayed data, 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 relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0226] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0227] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for adjusting the internal resistance of a battery pack, characterized in that: The method comprises: Determining a target control strategy based on predetermined state information of the battery pack; According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

2. The method according to claim 1, characterized in that The state information includes the battery operating time, open circuit voltage and initial power of each battery; the target control strategy is determined based on the predetermined battery pack state information, including: In the case where the battery operating time, the open circuit voltage and the initial power satisfy the trigger condition of the same charging amount, the first control strategy is determined as the target control strategy; the first control strategy is used to control the pulse current of each battery in the battery pack; When the battery operating time, the open circuit voltage and the initial power meet different trigger 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.

3. The method according to claim 2, characterized in that According to the target control strategy, controlling the control switch corresponding to each battery in the battery pack to be closed or opened, and adjusting the heat generation of each battery in the battery pack, includes: Acquiring internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information; When the target control strategy is the first control strategy, controlling the control switch corresponding to each battery in the battery pack to be closed; and A short high-amplitude pulse current is input to the target battery, and a long low-amplitude pulse current is input to other batteries in the battery pack to adjust the heat generation of each battery in the battery pack; wherein the pulse amplitude of the short high-amplitude pulse current is higher than the pulse amplitude of the long low-amplitude pulse current, and the input duration of the long low-amplitude pulse current is greater than the input duration of the short high-amplitude pulse current.

4. The method according to claim 2, characterized in that: According to the target control strategy, controlling the control switch corresponding to each battery in the battery pack to be closed or opened, and adjusting the heat generation of each battery in the battery pack, includes: Acquiring internal resistance distribution information of each battery in the battery pack, and determining a target battery according to the internal resistance distribution information; When the target control strategy is the second control strategy, controlling the control switch corresponding to each battery in the battery pack to be closed; and The control switch corresponding to the target battery is controlled to close for a first preset time, and the control switches corresponding to other batteries in the battery pack are controlled to close for a second preset time, so as to adjust the heat generation of each battery in the battery pack; wherein the first preset time is greater than the second preset time.

5. The method according to claim 3 or 4, characterized in that: The determining a target battery according to the internal resistance distribution information includes: Sorting the internal resistance of each of the batteries to obtain a sorting result; Determine at least two candidate battery groups according to a plurality of batteries whose internal resistance meets a preset threshold in the sorting result; The candidate battery groups are alternately selected to obtain a target battery group, wherein the batteries in the target battery group are the target batteries.

6. A battery system, characterized in that: The battery system comprises a plurality of batteries and a control unit arranged in parallel, and each branch where the battery is located is provided with a control switch; The control unit is used to determine a target control strategy based on predetermined battery pack status information; According to the target control strategy, the control switch corresponding to each battery in the battery pack is 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.

7. A battery pack internal resistance regulating device, characterized in that: The device comprises: A strategy determination module, used to determine a target control strategy based on predetermined battery pack status information; The internal resistance regulating module is used to control the control switch corresponding to each battery in the battery pack to be closed or opened according to the target regulation strategy, and to regulate the heat generation of each battery in the battery pack to balance the internal resistance of each battery in the battery pack.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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