Charging and discharging power regulation and control method, device and equipment for parallel battery packs

Abstract

The invention discloses a charging and discharging power regulation and control method, device and equipment for parallel battery packs and a readable storage medium, and relates to the technical field of batteries. Comprising the following steps: performing data sampling on each single packet in the parallel battery pack according to a preset sampling step length, and determining a target single packet from each single packet according to the sampled data; calculating a proportionality coefficient, an integral coefficient and a differential coefficient of the target single packet based on the sampling data of the target single packet; based on the proportionality coefficient, the integral coefficient, the differential coefficient and the sampling data of the target single packet, calculating a charging and discharging current increment instruction value of the target single packet in the current control period; and adjusting the charging and discharging power of all single packs in the parallel battery packs until the current sampling value of any single pack is greater than the allowable charging and discharging current value of the single pack and the single pack with the minimum allowable charging and discharging current value also reaches a stable state. According to the method, the stability of the parallel battery pack is maintained on the basis of improving the power utilization rate of the parallel battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a charging and discharging power regulation method, device and equipment of parallel battery packs and a readable storage medium. BACKGROUND

[0002] With the rapid development of electrification technology, electricity is increasingly widely used in transportation, energy storage, portable devices and industrial fields, and people's demand for longer endurance, higher power and higher capacity energy systems continues to grow. However, the capacity and output capability of a single single pack are restricted by factors such as volume, weight, installation space, etc., and the energy and power that can be provided have a ceiling, making it difficult to meet the current application requirements for high energy density and high power output. Therefore, battery systems that can be expanded by connecting multiple single packs in parallel have gradually become the mainstream direction. By flexibly combining multiple single packs, the overall capacity and power can be significantly improved, providing higher market competitiveness.

[0003] In a parallel battery system, SOP (State of Power) is used to represent the maximum current that the battery system can safely and continuously output or absorb under given environmental and operating conditions. Unlike a single single pack, the SOP of a parallel system is a system-level indicator and cannot be simply considered as the linear accumulation of single pack SOP. Its calculation must take into account factors such as voltage differences, SOC (State of Charge), SOH (State of Health), temperature differences and internal resistance inconsistencies between multiple parallel battery packs. The significance of parallel SOP is that it can comprehensively reflect the power capability of the entire system, and by dynamically adjusting the system current, it can ensure that in the case of significant differences between single packs, a single pack does not enter an overload state due to overcurrent, thereby ensuring the reliability and safety of the system.

[0004] However, the existing parallel SOP calculation method has obvious limitations. One common method is to take the smallest single pack SOP in the system and multiply it by the number of parallel packs to obtain the system SOP. Although this method can avoid overcurrent in the weakest single pack, since the current distribution in a parallel system is affected by factors such as voltage difference, single cell internal resistance and connection line resistance, it is not evenly distributed, so this method will significantly limit the available power of other single packs with better performance, forcing the charging power of the entire system to be at a lower level, which severely affects charging speed and user experience.

[0005] Another way is to add an independent DCDC current limiting module to each single pack, so that each single pack can automatically limit current according to its own SOP, thereby achieving independent power regulation of each pack, and directly accumulating the SOP of multiple packs as the system SOP. Although this method can improve power distribution, it requires each single pack to be equipped with a high-power DCDC module, significantly increasing hardware costs, system complexity and volume, which is not conducive to large-scale applications.

[0006] Therefore, how to realize a new method capable of dynamically adjusting and packing system SOP, avoiding single package overcurrent, and maximizing overall power capability without relying on additional hardware has become a problem that the current technology urgently needs to solve. SUMMARY

[0007] The application aims to provide a parallel battery pack charging and discharging power regulation method, device, equipment and readable storage medium, which performs step-by-step sampling and real-time parameter sensing on the parallel battery pack, takes a target single pack as the control core, and adaptively calculates the proportional coefficient, integral coefficient and differential coefficient in combination with the temperature, internal resistance, charge, battery health and other key state quantities of the target single pack, so that the regulation process can dynamically compensate for the performance differences between battery packs. By using the charging and discharging power increment of the target single pack as the system charging and discharging power regulation amount, the power regulation process of the parallel pack system can present a small, predictable and convergent dynamic adjustment characteristic. This scheme ensures that the current of the weakest battery pack does not exceed its power capability boundary during the adjustment process, while avoiding the overall power reduction caused by the fixed minimum charging and discharging power or excessive current limiting in traditional methods, thereby maximizing the available power of the system under the premise of ensuring safety. Ultimately, the application realizes fast, stable and adaptive regulation of the charging and discharging process of the parallel battery pack system, improves the power utilization rate of the system, shortens the charging time, and improves the consistency, safety and service life of the entire battery system.

[0008] To achieve the above-mentioned purpose, the application provides the following technical scheme: In a first aspect, the application provides a parallel battery pack charging and discharging power regulation method, which comprises: Data sampling is performed on each single pack in the parallel battery pack according to a preset sampling step, to obtain sampling data of each single pack in the parallel battery pack, and the internal resistance value, battery remaining capacity value and battery health value of each single pack are determined based on the sampling data. The sampling data includes voltage sampling value, current sampling value and temperature sampling value. When the parallel battery pack enters the charging and discharging mode, if the current sampling value of any single pack is greater than the allowable charging and discharging current value of the single pack, the single pack is set as the target single pack. If the current sampling value of any single pack is not greater than the allowable charging and discharging current value of the single pack, the single pack with the smallest allowable charging and discharging current value is set as the target single pack. The proportional coefficient, integral coefficient and differential coefficient of the target single pack are calculated based on the temperature sampling value, internal resistance value, battery remaining capacity value and battery health value of the target single pack. The charging and discharging current increment instruction value of the target single pack in the current control period is calculated based on the proportional coefficient, integral coefficient, differential coefficient of the target single pack, the difference between the current sampling value and the target current value, and the preset control step. The power adjustment module is configured to adjust the charging and discharging power of all single battery packs in the parallel battery pack based on the charging and discharging current increment instruction value of the target single battery pack in the current control cycle, until there is no single battery pack whose current sampling value is greater than the allowed charging and discharging current value of the single battery pack, and the single battery pack with the minimum allowed charging and discharging current value also reaches a stable state.

[0009] In a second aspect, the present application further provides a charging and discharging power regulation device for parallel battery packs, which comprises: a data sampling module configured to sample data of each single battery pack in the parallel battery pack according to a preset sampling step, to obtain sampling data of each single battery pack in the parallel battery pack, and to determine the internal resistance value, the battery remaining capacity value and the battery health value of each single battery pack based on the sampling data, wherein the sampling data comprises a voltage sampling value, a current sampling value and a temperature sampling value; a target determination module configured to, when the parallel battery pack enters a charging and discharging mode, determine a target single battery pack as follows: if there is any single battery pack whose current sampling value is greater than the allowed charging and discharging current value of the single battery pack, the single battery pack is determined as the target single battery pack; or if there is no single battery pack whose current sampling value is greater than the allowed charging and discharging current value of the single battery pack, the single battery pack with the minimum allowed charging and discharging current value is determined as the target single battery pack; a coefficient calculation module configured to calculate the proportional coefficient, the integral coefficient and the differential coefficient of the target single battery pack based on the temperature sampling value, the internal resistance value, the battery remaining capacity value and the battery health value of the target single battery pack; an increment calculation module configured to calculate the charging and discharging current increment instruction value of the target single battery pack in the current control cycle based on the proportional coefficient, the integral coefficient, the differential coefficient of the target single battery pack, the difference between the current sampling value and the target current value, and a preset control step; a power adjustment module configured to adjust the charging and discharging power of all single battery packs in the parallel battery pack based on the charging and discharging current increment instruction value of the target single battery pack in the current control cycle, until there is no single battery pack whose current sampling value is greater than the allowed charging and discharging current value of the single battery pack, and the single battery pack with the minimum allowed charging and discharging current value also reaches a stable state.

[0010] In a third aspect, the present application further provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the charging and discharging power regulation method for parallel battery packs provided in the first aspect when executing the computer program.

[0011] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program implements the charging and discharging power regulation method for parallel battery packs provided in the first aspect when executed by a processor.

[0012] In a fifth aspect, the present application further provides a computer program product, which comprises a computer program, and the computer program implements the charging and discharging power regulation method for parallel battery packs provided in the first aspect when executed by a processor.

[0013] The beneficial effects of the present application are that: the charging and discharging power regulation method of the parallel battery pack in the present application first samples the data of each single pack in the parallel battery pack according to a preset sampling step to obtain the sampling data of each single pack in the parallel battery pack, and determines the internal resistance value, the battery remaining capacity value and the battery health value of each single pack based on the sampling data; the sampling data includes voltage sampling value, current sampling value and temperature sampling value; when the parallel battery pack enters the charging and discharging mode, if the current sampling value of any single pack is greater than the allowed charging and discharging current value of the single pack, the single pack is the target single pack, and if the current sampling value of any single pack is not greater than the allowed charging and discharging current value of the single pack, the single pack with the smallest allowed charging and discharging current value is the target single pack; then the proportional coefficient, the integral coefficient and the differential coefficient of the target single pack are calculated based on the temperature sampling value, the internal resistance value, the battery remaining capacity value and the battery health value of the target single pack; then the charging and discharging current increment instruction value of the target single pack in the current control period is calculated based on the proportional coefficient, the integral coefficient, the differential coefficient of the target single pack, the difference between the current sampling value and the target current value and the preset control step; finally, the charging and discharging power of all single packs in the parallel battery pack is adjusted based on the charging and discharging current increment instruction value of the target single pack in the current control period, until there is no single pack whose current sampling value is greater than the allowed charging and discharging current value of the single pack, and the single pack with the smallest allowed charging and discharging current value also reaches a stable state. The above method realizes step-by-step sampling and real-time parameter sensing of the parallel battery pack, takes the target single pack as the control core, and adaptively calculates the proportional coefficient, the integral coefficient and the differential coefficient in combination with the temperature, the internal resistance, the charge, the battery health and other key state quantities of the target single pack, so that the regulation process can dynamically compensate for the performance differences of the battery packs. By using the charging and discharging power increment of the target single pack as the system charging and discharging power regulation amount, the power regulation process of the parallel pack system can present a small, predictable and convergent dynamic adjustment characteristic. This scheme ensures that the current of the weakest battery pack does not exceed its power capability boundary during the adjustment process, while avoiding the overall power drop caused by the fixed minimum charging and discharging power or excessive current limiting in traditional methods, thereby maximizing the available power of the system under the premise of ensuring safety. Ultimately, the present application realizes fast, stable and adaptive regulation of the charging and discharging process of the parallel battery pack system, improves the power utilization rate of the system, shortens the charging time, and improves the consistency, safety and service life of the entire battery system.

[0014] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, and to implement the content of the description, the following will be described in detail with reference to the preferred embodiments of the present application and in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A flowchart of a charging and discharging power regulation method of a parallel battery pack according to an embodiment of the present application; Figure 2 A flowchart of a process for calculating proportional, integral and derivative coefficients according to an embodiment of the present application is shown in the figure; Figure 3 A flowchart of another parallel battery pack charging and discharging power regulation method according to an embodiment of the present application is shown in the figure; Figure 4 A structural diagram of a parallel battery pack charging and discharging power regulation device according to an embodiment of the present application is shown in the figure; Figure 5 A structural diagram of another parallel battery pack charging and discharging power regulation device according to an embodiment of the present application is shown in the figure; Figure 6 An electronic device structure diagram according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0016] The technical solutions of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] It should be noted that the use of "one embodiment", "an embodiment", "example embodiment", etc. in the specification refers to the described embodiment including a specific feature, structure or characteristic, but not every embodiment must include these specific features, structures or characteristics. In addition, such expressions do not refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in connection with an embodiment, it is indicated that such a feature, structure or characteristic is combined with other embodiments within the knowledge of those skilled in the art, whether or not it is explicitly described.

[0018] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0019] In one embodiment, as shown in Figure 1 The present application provides a flowchart of a parallel battery pack charging and discharging power regulation method, and the specific method includes: S101, data sampling is performed on each single pack in the parallel battery pack according to a preset sampling step to obtain sampling data of each single pack in the parallel battery pack, and the internal resistance value, battery remaining capacity value and battery health value of each single pack are determined based on the sampling data; the sampling data includes voltage sampling value, current sampling value and temperature sampling value.

[0020] Specifically, the charging and discharging power regulation of the parallel battery pack is digital control, not continuous time control, so it is necessary to sample the data of each single pack in the parallel battery pack according to the preset sampling step to obtain the voltage sampling value, current sampling value and temperature sampling value of each single pack in the parallel battery pack, and calculate the internal resistance value, battery remaining capacity value and battery health value of each single pack according to the voltage sampling value, current sampling value and temperature sampling value.

[0021] S102, when the parallel battery pack enters the charging and discharging mode, if the current sampling value of any single pack is greater than the allowed charging and discharging current value of the single pack, the single pack is the target single pack, and if the current sampling value of any single pack is not greater than the allowed charging and discharging current value of the single pack, the single pack with the minimum allowed charging and discharging current value is the target single pack.

[0022] Specifically, the allowed charging and discharging current value is set according to the single pack specification book, which is a key parameter to ensure the safe and stable operation of the battery. If the current value exceeds during the charging and discharging process, it will damage the battery life or cause safety problems. When the parallel battery pack system enters the charging and discharging mode, the adaptive power distribution control is started. When the current sampling value of a single pack is greater than the allowed charging and discharging current value of the single pack, it means that the single pack is in a dangerous state, and the single pack needs to be taken as the target single pack for subsequent adjustment of the charging and discharging power of all single packs in the parallel battery pack system according to the charging and discharging current increment instruction value of the single pack. When there is no single pack whose current sampling value is greater than the allowed charging and discharging current value of the single pack, the allowed charging and discharging current values of all single packs can be compared to select the target single pack with the minimum allowed charging and discharging current value for subsequent adjustment of the charging and discharging power of all single packs in the parallel battery pack system according to the charging and discharging current increment instruction value of the single pack.

[0023] Further, if there are multiple single packs whose current sampling values are greater than their allowed charging and discharging current values, the deviations of the current sampling values and the allowed charging and discharging current values of all single packs are compared, and the single pack with the maximum deviation is taken as the target single pack.

[0024] Using the safety limit value of each battery monomer as the benchmark, the "over-limit risk pack" or "minimum allowed current pack" is dynamically identified as the key control target to adjust the total system power in real time, which realizes active and accurate overcurrent protection, eliminates safety hazards, and ensures that all parallel battery pack monomers work within the safe capacity range, thereby optimizing the output performance to the maximum extent and prolonging the battery pack life under the premise of ensuring the overall safety of the system.

[0025] S103, calculating the proportional coefficient, integral coefficient and differential coefficient of the target single pack based on the temperature sampling value, internal resistance value, battery remaining capacity value and battery health value of the target single pack.

[0026] PID control is a common algorithm in the field of automatic control, and its name comes from three core parameters: Proportional (P), Integral (I), and Derivative (D). PID controller can achieve precise control of the system through the combination of these three parameters, and is widely used in temperature, speed, pressure and other scenes that require stable control. Therefore, in order to realize the charge and discharge power regulation of parallel battery packs, the proportional coefficient, integral coefficient and derivative coefficient of the target single pack need to be obtained.

[0027] Specifically, the proportional coefficient, integral coefficient and derivative coefficient are related to the battery health, temperature, internal resistance, remaining capacity and other parameters of the single pack. Therefore, the proportional coefficient, integral coefficient and derivative coefficient are adjusted according to the related parameters of the single pack to ensure that the current system always remains stable. A relationship mapping table between temperature sampling value, internal resistance value, battery remaining capacity value and battery health value and proportional coefficient, integral coefficient and derivative coefficient can be pre-generated. When the temperature sampling value, internal resistance value, battery remaining capacity value and battery health value of the target single pack are determined, the proportional coefficient, integral coefficient and derivative coefficient of the target single pack are determined by table lookup.

[0028] S104, based on the proportional coefficient, integral coefficient, derivative coefficient of the target single pack, the difference between the current sampling value and the target current value, and the preset control step, calculate the charge and discharge current increment instruction value of the target single pack in the current control period.

[0029] Specifically, according to the Pid algorithm, the proportional coefficient, integral coefficient and derivative coefficient of the target single pack, the difference between the current sampling value and the target current value, and the preset control step, the charge and discharge current control instruction value of the target single pack in the current control period can be calculated. Based on the same scheme, the charge and discharge current control instruction value of the target single pack in the last control period is calculated. The charge and discharge current control instruction value of the target single pack in the current control period is subtracted from the charge and discharge current control instruction value of the target single pack in the last control period, that is, the charge and discharge current increment instruction of the target single pack in the current control period is obtained. It should be noted that the charge and discharge current increment instruction of the target single pack can be negative.

[0030] For example, the charge and discharge current control instruction value of the target single pack in the current control period (the kth control period) can be calculated according to the following formula (1): (1); Where K p_n represents the proportional coefficient of single pack n, K i_n represents the integral coefficient of single pack n, and K d_n represents the derivative coefficient of single pack n, e[k] nis the difference between the current sampling value obtained in the kth control period of the nth battery pack and the target current value, I sop [k] n is the charge-discharge current control instruction value of the target nth battery pack in the kth control period, and Δt is a preset control step.

[0031] Similarly, the charge-discharge current control instruction value of the target nth battery pack in the last control period (the (k-1)th control period) is calculated based on the following formula (2): (2); wherein K p_n represents the proportional coefficient of the nth battery pack, K i_n represents the integral coefficient of the nth battery pack, and K d_n represents the differential coefficient of the nth battery pack, e[k-1] n is the difference between the current sampling value obtained in the (k-1)th control period of the nth battery pack and the target current value, e[k-2] n is the difference between the current sampling value obtained in the (k-2)th control period of the nth battery pack and the target current value, I sop [k-1] n is the charge-discharge current control instruction value of the target nth battery pack in the (k-1)th control period, and Δt is a preset control step.

[0032] The charge-discharge current control instruction value of the target nth battery pack in the current control period is subtracted from the charge-discharge current control instruction value of the target nth battery pack in the last control period, i.e. the charge-discharge current increment instruction value of the target nth battery pack in the current control period is obtained, as shown in formula (3): (3); wherein K p_n represents the proportional coefficient of the nth battery pack, K i_n represents the integral coefficient of the nth battery pack, and K d_n represents the differential coefficient of the nth battery pack, e[k] n is the difference between the current sampling value obtained in the kth control period of the nth battery pack and the target current value, e[k-2] n is the difference between the current sampling value obtained in the (k-2)th control period of the nth battery pack and the target current value, ΔI sop [k] n is the charge-discharge current increment instruction value of the target nth battery pack in the kth control period, and Δt is a preset control step.

[0033] In S105, the charge-discharge power of all battery packs in the parallel battery pack system is adjusted based on the charge-discharge current increment instruction value of the target nth battery pack in the current control period, until there is no current sampling value of any battery pack greater than the allowed charge-discharge current value of the battery pack, and the allowed charge-discharge current value of the battery pack in the stable state is the smallest.

[0034] Specifically, the charge and discharge current control instruction value of each single pack in the parallel battery pack in the last control cycle is directly summed with the charge and discharge current increment instruction value of the target single pack in the current control cycle, that is, the charge and discharge current control instruction value of each single pack in the parallel battery pack in the current control cycle is obtained, until there is no single pack whose current sampling value is greater than the allowed charge and discharge current value of the single pack, and the single pack with the smallest allowed charge and discharge current value also reaches a stable state, that is, the charge and discharge power regulation of the parallel battery pack is completed. The specific formula can be referred to formula (4) as follows: I sop_sys [k]=I sop_sys [k-1]+ΔI sop [k] n (4); Wherein, I sop_sys [k] is the charge and discharge current instruction value of each single pack in the parallel battery pack system in the kth control cycle, I sop_sys [k-1] is the charge and discharge current instruction value of each single pack in the parallel battery pack system in the k-1th control cycle, ΔI sop [k] n is the charge and discharge current increment instruction value of the target single pack n in the kth control cycle.

[0035] Optionally, if the parallel battery pack exits the charge and discharge mode, the regulation can also be directly stopped.

[0036] The method for regulating the charging and discharging power of the parallel battery pack in the above embodiment first samples the data of each single pack in the parallel battery pack according to a preset sampling step to obtain the sampling data of each single pack in the parallel battery pack, and determines the internal resistance value, the remaining battery capacity value and the battery health value of each single pack based on the sampling data. The sampling data includes the voltage sampling value, the current sampling value and the temperature sampling value. When the parallel battery pack enters the charging and discharging mode, if the current sampling value of any single pack is greater than the allowable charging and discharging current value of the single pack, the single pack is regarded as the target single pack; if the current sampling value of any single pack is not greater than the allowable charging and discharging current value of the single pack, the single pack with the minimum allowable charging and discharging current value is regarded as the target single pack. Then, the proportional coefficient, the integral coefficient and the differential coefficient of the target single pack are calculated based on the temperature sampling value, the internal resistance value, the remaining battery capacity value and the battery health value of the target single pack. Then, the charging and discharging current increment instruction value of the target single pack in the current control period is calculated based on the proportional coefficient, the integral coefficient, the differential coefficient, the difference between the current sampling value and the target current value of the target single pack and the preset control step. Finally, the charging and discharging power of all single packs in the parallel battery pack is adjusted based on the charging and discharging current increment instruction value of the target single pack in the current control period, until the current sampling value of any single pack is not greater than the allowable charging and discharging current value of the single pack, and the single pack with the minimum allowable charging and discharging current value also reaches a stable state. The above method can dynamically compensate the performance difference of the battery pack by step sampling and real-time parameter sensing of the parallel battery pack, taking the target single pack as the control core, and adaptively calculating the proportional coefficient, the integral coefficient and the differential coefficient based on the temperature, the internal resistance, the charge, the battery health and other key state quantities of the target single pack. By using the charging and discharging current increment of the target single pack as the system charging and discharging current adjustment amount, the power regulation process of the parallel pack system can present a small, predictable and convergent dynamic adjustment characteristic. The scheme ensures that the current of the weakest battery pack does not exceed its power capability boundary during the adjustment process, while avoiding the overall power reduction caused by the fixed minimum charging and discharging power or excessive current limiting in the traditional method, thereby maximizing the available power of the system under the premise of ensuring safety. Finally, the present application realizes the fast, stable and adaptive regulation of the charging and discharging process of the parallel battery pack system, improves the power utilization rate of the system, shortens the charging time, and improves the consistency, safety and service life of the entire battery system.

[0037] In another embodiment, since the proportional coefficient, the integral coefficient and the differential coefficient are key factors for calculating the charging and discharging current increment instruction value of the target single pack, and the proportional coefficient, the integral coefficient and the differential coefficient are determined by the temperature sampling value, the internal resistance value, the remaining battery capacity value and the battery health value of the target single pack, the determination process of the proportional coefficient, the integral coefficient and the differential coefficient is described in detail in the embodiment, and the specific method is described in Figure 2 : S201, set the basic proportional coefficient and the basic integral coefficient of the target single pack, and obtain the optimal differential coefficient and the reference internal resistance of the target single pack in the reference state.

[0038] The reference state can be 25°C, 50% battery remaining capacity value, and 100% battery health.

[0039] Specifically, the basic proportional coefficient and the basic integral coefficient of the target single pack are set first, and then the optimal differential coefficient and the reference internal resistance of the target single pack in the reference state are obtained.

[0040] S202, calculate the proportional coefficient and the integral coefficient of the target single pack based on the basic proportional coefficient, the basic integral coefficient, the temperature sampling value, the battery remaining capacity value, and the battery health value of the target single pack.

[0041] Specifically, the larger the proportional coefficient, the greater the change of the charge and discharge current output value of the target single pack each time, that is, the faster the current target single pack charge and discharge current value approaches the target value, and the proportional coefficient is essentially related to the internal resistance of the battery cell. The higher the temperature sampling value and the battery health value, the smaller the internal resistance. The battery remaining capacity value and the internal resistance curve are in U-shaped distribution, and the internal resistance is usually smallest and stable in the 20%-80% stage. Therefore, when the parallel battery pack is charging, its current absorption capacity is stronger, and the current change of the system when the charging current changes will be greater. That is, the smaller the internal resistance, the faster the current change to the target current. At this time, the proportional coefficient needs to be reduced to prevent overshoot due to too fast adjustment. The adjustment of the integral coefficient is usually opposite to that of the proportional coefficient. Because the integral coefficient is used to correct the steady-state error of the system, it has a stronger effect when the system is stable, and needs to quickly correct the steady-state error. If it is in high temperature, the internal resistance is very small, the system response is very fast, and the adjustment is too large, which may cause repeated oscillation or overshoot and risk of thermal runaway. Therefore, the integral coefficient should be reduced to reduce the steady-state error adjustment speed. When the internal resistance increases (commonly seen in low temperature, low battery remaining capacity value, and low battery health value), the system response becomes slower and the inertia becomes larger, and the integral coefficient needs to be increased to maintain the previous adjustment speed.

[0042] Optionally, the way to calculate the proportional coefficient and the integral coefficient of the target single pack can also be: determining a proportional coefficient adjustment factor and an integral coefficient adjustment factor based on the temperature sampling value, the battery remaining capacity value, and the battery health value of the target single pack; performing product calculation on the basic proportional coefficient and the proportional coefficient adjustment factor to obtain the proportional coefficient of the target single pack; and performing product calculation on the basic integral coefficient and the integral coefficient adjustment factor to obtain the integral coefficient of the target single pack.

[0043] The proportional coefficient adjustment factor is determined based on the target single-pack temperature sampling value, the battery remaining capacity value and the battery health value, including: if the temperature sampling value is within the reference temperature range, the proportional coefficient adjustment factor is a fixed factor; if the temperature sampling value is lower than the reference temperature range, the proportional coefficient adjustment factor is increased; if the temperature sampling value is higher than the reference temperature range, the proportional coefficient adjustment factor is decreased; if the battery remaining capacity value is within the standard capacity range, the proportional coefficient adjustment factor is a fixed factor, if the battery remaining capacity value deviates from the standard capacity range but is less than or equal to a preset capacity threshold, the proportional coefficient adjustment factor is increased; if the battery remaining capacity value deviates from the standard capacity range and is greater than the preset capacity threshold, the proportional coefficient adjustment factor is decreased; if the battery health value is higher than a preset health threshold, the proportional coefficient adjustment factor is a fixed factor; if the battery health value is lower than the preset health threshold, the proportional coefficient adjustment factor is increased. If the temperature sampling value is within the reference temperature range, the integral coefficient adjustment factor is a fixed factor; if the temperature sampling value is lower than the reference temperature range, the integral coefficient adjustment factor is decreased; if the temperature sampling value is higher than the reference temperature range, the integral coefficient adjustment factor is decreased; if the battery remaining capacity value is within the standard capacity range, the integral coefficient adjustment factor is a fixed factor, if the battery remaining capacity value deviates from the standard capacity range, the integral coefficient adjustment factor is decreased; if the battery health value is higher than a preset health threshold, the integral coefficient adjustment factor is a fixed factor; if the battery health value is lower than the preset health threshold, the integral coefficient adjustment factor is decreased.

[0044] For example, when the battery health is 100%, the proportional coefficient adjustment factor is 1 and the integral coefficient adjustment factor is 1; when the battery health is 90%, the battery internal resistance increases, the proportional coefficient is increased and the integral coefficient is decreased, and accordingly, the proportional coefficient adjustment factor is 1.3 and the integral coefficient adjustment factor is 0.8; when the battery health is 85%, the battery internal resistance further increases, the proportional coefficient is further increased and the integral coefficient is further decreased, and accordingly, the proportional coefficient adjustment factor is 1.6 and the integral coefficient adjustment factor is 0.6; when the battery health is below 80%, the battery is seriously aged, the proportional coefficient adjustment factor is 1.8 and the integral coefficient adjustment factor is 0.5.

[0045] For example, when the temperature is 0-6℃, the low temperature leads to an increase in the battery internal resistance, the proportional coefficient adjustment factor is 1.8 and the integral coefficient adjustment factor is 0.6; when the temperature is 6-15℃, the proportional coefficient adjustment factor is 1.3 and the integral coefficient adjustment factor is 0.8; when the temperature is 16-25℃ (reference temperature range), the proportional coefficient adjustment factor is 1.0 and the integral coefficient adjustment factor is 1.0; when the temperature is 25-40℃, the proportional coefficient adjustment factor is 0.9 and the integral coefficient adjustment factor is 1.0; when the temperature is 40-50℃, the proportional coefficient adjustment factor is 0.8 and the integral coefficient adjustment factor is 0.9.

[0046] For example, when the battery remaining capacity value is 0-10%, the proportional coefficient adjustment factor is 1.8 and the integral coefficient adjustment factor is 0.5; when the battery remaining capacity value is 10-20%, the proportional coefficient adjustment factor is 1.3 and the integral coefficient adjustment factor is 0.8; when the battery remaining capacity value is 20-80% (standard capacity range), the proportional coefficient adjustment factor is 1.0 and the integral coefficient adjustment factor is 1.0; when the battery remaining capacity value is 80-95%, the proportional coefficient adjustment factor is 1.3 and the integral coefficient adjustment factor is 0.9; and when the battery remaining capacity value is greater than 95%, the proportional coefficient adjustment factor is 0.9 and the integral coefficient adjustment factor is 0.7.

[0047] After the proportional coefficient adjustment factor and the integral coefficient adjustment factor are determined, the proportional coefficient and the integral coefficient can be calculated according to the following formulas (5) and (6): (5); (6); wherein Kp is the proportional coefficient, KI is the integral coefficient, Kp0 is the basic proportional coefficient, KI0 is the basic integral coefficient, Fb is the adjustment factor of the battery health on the proportional coefficient, Ft is the adjustment factor of the temperature on the proportional coefficient, Fc is the adjustment factor of the battery remaining capacity value on the proportional coefficient, Fb is the adjustment factor of the battery health on the integral coefficient, Ft is the adjustment factor of the temperature on the integral coefficient, and Fc is the adjustment factor of the battery remaining capacity value on the integral coefficient. p_n i_n p_base i_base SOH_Kp T_kp SOC_Kp SOH_Ki T_ki SOC_Ki

[0048] Optionally, in addition to calculating the proportional coefficient and the integral coefficient of the target single pack based on the basic proportional coefficient, the basic integral coefficient, the temperature sampling value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient and the integral coefficient of the target single pack can also be determined by the following method: obtaining the optimal proportional coefficient, the optimal integral coefficient and the reference internal resistance of the target single pack in the reference state; and calculating the proportional coefficient and the integral coefficient of the target single pack based on the optimal proportional coefficient, the optimal integral coefficient, the reference internal resistance and the internal resistance value.

[0049] ​​​​​​​​​​Specifically, the essence of calculating the proportional coefficient and the integral coefficient of the target single pack based on the temperature sampling value, the battery remaining capacity value and the battery health value is still the change of the control coefficient based on the change of the internal resistance, so the optimal proportional coefficient, the optimal integral coefficient, the reference internal resistance and the internal resistance value (i.e. the current estimated internal resistance value) of the target single pack under the reference state (such as 25°C, 50% battery remaining capacity value, 100% health value) can be obtained, and the proportional coefficient and the integral coefficient are calculated according to the following formulas (7)-(8): ; ; Wherein, K p_n is the proportional coefficient, K i_n is the integral coefficient, K p_nom is the optimal proportional coefficient, K i_nom is the optimal integral coefficient, R nominal is the reference internal resistance, and R act is the current estimated internal resistance value.

[0050] S203, calculating the differential coefficient of the target single pack based on the optimal differential coefficient of the target single pack, the reference internal resistance and the limit internal resistance value.

[0051] Wherein, the optimal differential coefficient and the reference internal resistance are the differential coefficient and the internal resistance of the target single pack under the reference state (such as 25°C, 50% battery remaining capacity value, 100% health value).

[0052] Specifically, the role of the differential coefficient is to reduce the current adjustment speed when the current is close to the target value, but it is very sensitive to noise, and the sampling speed of the current is relatively fast, so the fluctuation will be relatively large, so a very small fixed value is usually given, which is related to the current sampling period, the preset control step and the battery internal resistance. The calculation formula of the differential coefficient is referred to the following formula (9): (9); Wherein, K d_n is the differential coefficient, K d_nom is the optimal differential coefficient, R nom is the reference internal resistance, R max is the limit internal resistance value of the battery in the worst case, T s is the sampling period, and Δt is the preset control step.

[0053] The proportional coefficient, integral coefficient and differential coefficient calculation method in the above embodiment first sets a basic proportional coefficient and a basic integral coefficient of a target single pack, and obtains an optimal differential coefficient and a reference internal resistance of the target single pack in a reference state; then calculates a proportional coefficient and an integral coefficient of the target single pack based on the basic proportional coefficient, the basic integral coefficient, a temperature sampling value, a battery remaining capacity value and a battery health value of the target single pack; and finally calculates a differential coefficient of the target single pack based on the optimal differential coefficient, the reference internal resistance and a limit internal resistance value of the target single pack. The proportional coefficient, the integral coefficient and the differential coefficient are determined in real time according to the temperature sampling value, the battery remaining capacity value and the battery health value, the coefficients are adaptively adjusted according to the state of the battery pack, and the accuracy of the coefficients is improved.

[0054] In order to comprehensively show the present scheme, the present embodiment gives an optional way of the charge-discharge power regulation method of the parallel battery pack, as shown in Figure 3 S301, data sampling is performed on each single pack in the parallel battery pack according to a preset sampling step, sampling data of each single pack in the parallel battery pack is obtained, and an internal resistance value, a battery remaining capacity value and a battery health value of each single pack are determined based on the sampling data.

[0055] The sampling data includes a voltage sampling value, a current sampling value and a temperature sampling value.

[0056] S302, when the parallel battery pack enters a charge-discharge mode, if the current sampling value of any single pack is greater than the allowed charge-discharge current value of the single pack, the single pack is set as a target single pack; if the current sampling value of any single pack is not greater than the allowed charge-discharge current value of the single pack, the single pack with the minimum allowed charge-discharge current value is set as the target single pack.

[0057] If the current sampling value of multiple single packs is greater than the allowed charge-discharge current value of the single pack, the deviation of the current sampling value and the allowed charge-discharge current value of each single pack is compared, and the single pack with the maximum deviation is set as the target single pack.

[0058] S303, a basic proportional coefficient and a basic integral coefficient of the target single pack are set, and an optimal differential coefficient and a reference internal resistance of the target single pack in a reference state are obtained.

[0059] S304, a proportional coefficient adjustment factor and an integral coefficient adjustment factor are determined based on a temperature sampling value, a battery remaining capacity value and a battery health value of the target single pack.

[0060] ​If the temperature sampling value is within the reference temperature range, the proportional coefficient adjustment factor is a fixed factor; if the temperature sampling value is lower than the reference temperature range, the proportional coefficient adjustment factor is increased; if the temperature sampling value is higher than the reference temperature range, the proportional coefficient adjustment factor is decreased; if the battery remaining power value is within the standard power range, the proportional coefficient adjustment factor is a fixed factor; if the battery remaining power value deviates from the standard power range but is less than or equal to the preset power threshold, the proportional coefficient adjustment factor is increased; if the battery remaining power value deviates from the standard power range and is greater than the preset power threshold, the proportional coefficient adjustment factor is decreased; if the battery health value is higher than the preset health threshold, the proportional coefficient adjustment factor is a fixed factor; if the battery health value is lower than the preset health threshold, the proportional coefficient adjustment factor is increased; if the temperature sampling value is within the reference temperature range, the integral coefficient adjustment factor is a fixed factor; if the temperature sampling value is lower than the reference temperature range, the integral coefficient adjustment factor is decreased; if the temperature sampling value is higher than the reference temperature range, the integral coefficient adjustment factor is decreased; if the battery remaining power value is within the standard power range, the integral coefficient adjustment factor is a fixed factor; if the battery remaining power value deviates from the standard power range, the integral coefficient adjustment factor is decreased; if the battery health value is higher than the preset health threshold, the integral coefficient adjustment factor is a fixed factor; if the battery health value is lower than the preset health threshold, the integral coefficient adjustment factor is decreased.

[0061] S305, the base proportional coefficient and the proportional coefficient adjustment factor are multiplied to obtain the proportional coefficient of the target single pack.

[0062] S306, the base integral coefficient and the integral coefficient adjustment factor are multiplied to obtain the integral coefficient of the target single pack.

[0063] Optionally, the optimal proportional coefficient, the optimal integral coefficient and the reference internal resistance of the target single pack in the reference state are obtained; and the proportional coefficient and the integral coefficient of the target single pack are calculated based on the optimal proportional coefficient, the optimal integral coefficient, the reference internal resistance and the internal resistance value.

[0064] S307, the differential coefficient of the target single pack is calculated based on the optimal differential coefficient of the target single pack, the reference internal resistance and the limit internal resistance value.

[0065] S308, the charge-discharge current increment instruction value of the target single pack in the current control period is calculated based on the proportional coefficient, the integral coefficient, the differential coefficient of the target single pack, the difference between the current sampling value and the target current value, and the preset control step.

[0066] S309, the charge-discharge power of all single packs in the parallel battery pack is adjusted based on the charge-discharge current increment instruction value of the target single pack in the current control period, until there is no single pack whose current sampling value is greater than the allowable charge-discharge current value of the single pack, and the single pack with the smallest allowable charge-discharge current value also reaches a stable state.

[0067] The specific process of S301-S309 can be referred to the description of the above method embodiments, which has similar implementation principles and technical effects, and will not be described here.

[0068] Based on the same inventive concept, the application also provides a parallel battery pack charging and discharging power regulation device for implementing the parallel battery pack charging and discharging power regulation method. The device provides a solution to the implementation scheme as described in the above method, and therefore the specific limitations in one or more parallel battery pack charging and discharging power regulation device embodiments provided below can be referred to the limitations of the parallel battery pack charging and discharging power regulation method described above, and will not be described here.

[0069] In one embodiment, as shown in Figure 4 a parallel battery pack charging and discharging power regulation device is provided, which comprises: a data sampling module 40, configured to sample data of each single pack in the parallel battery pack according to a preset sampling step, to obtain sampling data of each single pack in the parallel battery pack, and to determine the internal resistance value, the battery remaining capacity value and the battery health value of each single pack based on the sampling data; the sampling data includes voltage sampling value, current sampling value and temperature sampling value; a target determination module 41, configured to, when the parallel battery pack enters a charging and discharging mode, if there is any single pack whose current sampling value is greater than the allowed charging and discharging current value of the single pack, make the single pack as a target single pack, and if there is no single pack whose current sampling value is greater than the allowed charging and discharging current value of the single pack, make the single pack with the minimum allowed charging and discharging current value as the target single pack; a coefficient calculation module 42, configured to calculate the proportional coefficient, the integral coefficient and the differential coefficient of the target single pack based on the temperature sampling value, the internal resistance value, the battery remaining capacity value and the battery health value of the target single pack; an increment calculation module 43, configured to calculate the charging and discharging current increment instruction value of the target single pack in the current control period based on the proportional coefficient, the integral coefficient, the differential coefficient of the target single pack, the difference between the current sampling value and the target current value, and a preset control step; a power adjustment module 44, configured to adjust the charging and discharging power of all single packs in the parallel battery pack based on the charging and discharging current increment instruction value of the target single pack in the current control period, until there is no single pack whose current sampling value is greater than the allowed charging and discharging current value of the single pack, and the single pack with the minimum allowed charging and discharging current value also reaches a stable state.

[0070] In another embodiment, as shown in Figure 5 , Figure 4 the coefficient calculation module 42 in The base setting unit 420 is configured to set a base proportional coefficient and a base integral coefficient of the target single pack, and obtain an optimal differential coefficient and a reference internal resistance of the target single pack in a reference state; The first calculation unit 421 is configured to calculate a proportional coefficient and an integral coefficient of the target single pack based on the base proportional coefficient, the base integral coefficient, a temperature sampling value, a battery remaining power value and a battery health value of the target single pack; The second calculation unit 422 is configured to calculate a differential coefficient of the target single pack based on the optimal differential coefficient, the reference internal resistance and a limit internal resistance value of the target single pack.

[0071] The embodiments of the present application also provide an electronic device. In some embodiments, referring to FIG. 7, Figure 6 As shown in FIG. 7, the electronic device 700 includes an input unit 710, a memory 720, a processor 730 and an output unit 740. The memory 720 stores program instructions executable on the processor 730, and the processor 730 invokes the program instructions to perform the charging and discharging power regulation method and / or technical solutions of the parallel battery pack in the foregoing embodiments. The electronic device 700 can be a mobile terminal device such as a mobile phone or a computer.

[0072] In addition, the embodiments of the present application also provide a computer readable storage medium for storing a computer program for performing the charging and discharging power regulation method of the parallel battery pack. For example, computer program instructions, when executed by a computer, can invoke or provide the method and / or technical solutions according to the present application through the operation of the computer. The program instructions for invoking the method of the present application can be stored in a fixed or removable storage medium, and / or transmitted and / or stored in a storage medium according to the program instructions.

[0073] Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present application can be realized by a general computing device, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module. Therefore, the present application is not limited to any specific combination of hardware and software.

[0074] The technical features of the above embodiments can be integrated in any manner. In order to make the description simple, not all possible integrations of the technical features in the above embodiments are described, however, as long as the integrations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0075] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for regulating the charge and discharge power of parallel battery packs, characterized in that, The method comprises: According to the preset sampling step, the data of each single pack in the parallel battery pack is sampled to obtain the sampling data of each single pack in the parallel battery pack, and the internal resistance value, the battery remaining capacity value and the battery health value of each single pack are determined based on the sampling data; the sampling data includes voltage sampling value, current sampling value and temperature sampling value; When the parallel battery pack enters the charging and discharging mode, if the current sampling value of any single pack is greater than the allowable charging and discharging current value of the single pack, the single pack is the target single pack; if the current sampling value of any single pack is not greater than the allowable charging and discharging current value of the single pack, the single pack with the smallest allowable charging and discharging current value is the target single pack; Based on the temperature sampling value, the internal resistance value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient, the integral coefficient and the differential coefficient of the target single pack are calculated; Based on the proportional coefficient, the integral coefficient, the differential coefficient, the difference between the current sampling value and the target current value of the target single pack and the preset control step, the charging and discharging current increment instruction value of the target single pack in the current control period is calculated; Based on the charging and discharging current increment instruction value of the target single pack in the current control period, the charging and discharging power of all single packs in the parallel battery pack is adjusted until there is no single pack whose current sampling value is greater than the allowable charging and discharging current value of the single pack, and the single pack with the smallest allowable charging and discharging current value also reaches a stable state.

2. The method of claim 1, wherein the method further comprises: Based on the temperature sampling value, the internal resistance value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient, the integral coefficient and the differential coefficient of the target single pack are calculated, comprising: The base proportional coefficient and the base integral coefficient of the target single pack are set, and the optimal differential coefficient and the reference internal resistance of the target single pack in the reference state are obtained; Based on the base proportional coefficient, the base integral coefficient, the temperature sampling value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient and the integral coefficient of the target single pack are calculated; Based on the optimal differential coefficient, the reference internal resistance and the limit internal resistance value of the target single pack, the differential coefficient of the target single pack is calculated.

3. The method of claim 2, wherein the step of determining the power limit of each parallel battery pack is performed by the controller. Based on the base proportional coefficient, the base integral coefficient, the temperature sampling value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient and the integral coefficient of the target single pack are calculated, comprising: Based on the temperature sampling value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient adjustment factor and the integral coefficient adjustment factor are determined; The base proportional coefficient and the proportional coefficient adjustment factor are multiplied to obtain the proportional coefficient of the target single pack; The base integral coefficient and the integral coefficient adjustment factor are multiplied to obtain the integral coefficient of the target single pack.

4. The method of claim 3, wherein the step of determining the power limit of each parallel battery pack is performed by the controller. Based on the temperature sampling value, the battery remaining capacity value and the battery health value of the target single pack, the proportional coefficient adjustment factor is determined, comprising: If the temperature sampling value is within the reference temperature range, the proportional coefficient adjustment factor is a fixed factor; if the temperature sampling value is lower than the reference temperature range, the proportional coefficient adjustment factor is increased; if the temperature sampling value is higher than the reference temperature range, the proportional coefficient adjustment factor is decreased; If the battery remaining capacity value is in the standard capacity range, the proportional coefficient adjustment factor is a fixed factor; if the battery remaining capacity value deviates from the standard capacity range but is less than or equal to the preset capacity threshold, the proportional coefficient adjustment factor is increased; if the battery remaining capacity value deviates from the standard capacity range and is greater than the preset capacity threshold, the proportional coefficient adjustment factor is decreased. If the battery health value is higher than the preset health threshold, the proportional coefficient adjustment factor is a fixed factor; if the battery health value is lower than the preset health threshold, the proportional coefficient adjustment factor is increased.

5. The method of claim 3, wherein the step of determining the power limit of each parallel battery pack is performed by: determining a power limit of each parallel battery pack based on a state of charge of each parallel battery pack, a state of health of each parallel battery pack, and a temperature of each parallel battery pack. Based on the temperature sampling value, the battery remaining capacity value and the battery health value of the target single pack, an integral coefficient adjustment factor is determined, including: If the temperature sampling value is in the reference temperature range, the integral coefficient adjustment factor is a fixed factor; if the temperature sampling value is lower than the reference temperature range, the integral coefficient adjustment factor is decreased; if the temperature sampling value is higher than the reference temperature range, the integral coefficient adjustment factor is decreased. If the battery remaining capacity value is in the standard capacity range, the integral coefficient adjustment factor is a fixed factor; if the battery remaining capacity value deviates from the standard capacity range, the integral coefficient adjustment factor is decreased. If the battery health value is higher than the preset health threshold, the integral coefficient adjustment factor is a fixed factor; if the battery health value is lower than the preset health threshold, the integral coefficient adjustment factor is decreased.

6. The method of claim 2, wherein the step of determining the power limit of each parallel battery pack is performed by the controller. The method further includes: Obtaining the optimal proportional coefficient, the optimal integral coefficient and the reference internal resistance of the target single pack in the reference state; Based on the optimal proportional coefficient, the optimal integral coefficient, the reference internal resistance and the internal resistance value, the proportional coefficient and the integral coefficient of the target single pack are calculated.

7. A charge-discharge power regulating device for parallel battery packs, characterized by, The device includes: A data sampling module is configured to sample data of each single pack in the parallel battery pack according to a preset sampling step, to obtain sampling data of each single pack in the parallel battery pack, and to determine the internal resistance value, the battery remaining capacity value and the battery health value of each single pack based on the sampling data; the sampling data includes a voltage sampling value, a current sampling value and a temperature sampling value; A target determination module is configured to, when the parallel battery pack enters a charging and discharging mode, if the current sampling value of any single pack is greater than the allowable charging and discharging current value of the single pack, determine the single pack as a target single pack, and if the current sampling value of any single pack is not greater than the allowable charging and discharging current value of the single pack, determine the single pack with the smallest allowable charging and discharging current value as the target single pack; A coefficient calculation module is configured to calculate the proportional coefficient, the integral coefficient and the differential coefficient of the target single pack based on the temperature sampling value, the internal resistance value, the battery remaining capacity value and the battery health value of the target single pack; An increment calculation module is configured to calculate the charging and discharging current increment instruction value of the target single pack in the current control period based on the proportional coefficient, the integral coefficient, the differential coefficient of the target single pack, the difference between the current sampling value and the target current value and a preset control step. The power adjustment module is configured to adjust the charging and discharging power of all the single battery packs in the parallel battery pack based on the target single battery pack's charging and discharging current increment instruction value in the current control cycle until there is no single battery pack whose current sampling value is greater than the allowed charging and discharging current value of the single battery pack, and the single battery pack with the smallest allowed charging and discharging current value also reaches a stable state.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, The processor executes the computer program to implement the charging and discharging power regulation method of the parallel battery pack in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the charging and discharging power regulation method of the parallel battery pack in any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the charging and discharging power regulation method of the parallel battery pack in any one of claims 1 to 6.

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