Balanced monitoring method and device for battery pack system, computer equipment and storage medium

Abstract

The invention provides a battery pack system equalization monitoring method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring battery pack equalization state parameters of a battery pack group; performing equalization adjustment processing on the battery pack equalization state parameter and a preset equalization state parameter to obtain a battery pack equalization adjustment quantity; and according to the battery pack equalization adjustment amount, an equalization on-off regulation and control signal is sent to a main control pack equalization central controller. After the battery pack equalization state parameters are collected, the equalization operation condition between the current internal battery packs of the battery pack group is determined, then the battery pack equalization state parameters are compared with the standard equalization state parameters, and finally the battery pack equalization state parameters are determined according to the difference value. According to the invention, the equalization mode between the battery packs in the electric pack group is optimized and adjusted through the main control pack equalization central controller without changing the serial-parallel number of the battery cells in the battery packs, so that the equalization maintenance difficulty and maintenance cost between the battery packs are effectively reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a method, device, computer equipment and storage medium for balancing and monitoring a battery pack system. Background Art

[0002] As a clean energy source, lithium-ion batteries are widely used in various fields, which brings with it different requirements for battery voltage platforms and capacities. Especially in high-voltage, high-capacity application scenarios, single batteries are difficult to meet the requirements and have high maintenance costs. Therefore, multi-battery systems have become a feasible solution to the above problems. However, individual differences between batteries will cause imbalance in the battery during use, shortening the battery life. Therefore, in order to keep the differences between batteries within a safe range, multi-battery systems need to introduce balancing management.

[0003] The prior art mostly adopts an active balancing method of transferring the power of a high-voltage battery to a low-voltage battery. For example, the currently published Chinese invention patent application - a battery array balancing circuit and balancing method (patent number CN108134426A) provides a balancing method, which controls the switch tube inside the single battery to select different power paths, first stores part of the power of the high-voltage battery in an external energy storage element, and then transfers the power on the energy storage element to the low-voltage battery, and uses the external energy storage element as a medium to transfer the energy of the high-voltage battery to the low-voltage battery, thereby achieving battery power balancing.

[0004] However, the above balancing method is based on the battery cells rather than the battery pack. Once the battery array is formed, it is difficult to change the number of battery cells in series and parallel, and the maintenance difficulty and cost increase accordingly. Although the battery array can be extended infinitely in theory, each battery cell corresponds to a balancing module, and each balancing module is composed of multiple switch tubes. The control module requires a large number of control ports to control these switch tubes, which limits the expansion of the battery array. Summary of the invention

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a battery pack system balancing monitoring method, device, computer equipment and storage medium that effectively reduce the maintenance difficulty and maintenance cost of balancing between battery packs.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A battery pack system balancing monitoring method, the method comprising:

[0008] Obtain the battery pack balancing state parameters of the battery pack group;

[0009] Performing a balance adjustment process on the battery pack balance state parameter and the preset balance state parameter to obtain a battery pack balance adjustment value;

[0010] According to the battery pack balancing adjustment amount, a balancing on / off control signal is sent to the main control pack balancing central controller to adjust the on / off of the balancing circuit of the battery pack to be balanced.

[0011] In one of the embodiments, the obtaining of the battery pack balancing state parameter of the battery pack group includes: obtaining a maximum value of the battery pack pressure difference of the battery pack group.

[0012] In one of the embodiments, the battery pack balanced state parameters are balanced and adjusted with preset balanced state parameters to obtain a battery pack balanced adjustment value, including: calculating the adjustment between the maximum pressure difference of the battery pack and the preset maximum pressure difference to obtain a battery pack balanced maximum pressure difference adjustment.

[0013] In one of the embodiments, a balancing start and stop control signal is sent to the main control pack balancing central controller according to the battery pack balancing adjustment amount to adjust the on and off of the balancing circuit of the battery pack to be balanced, including: detecting whether the maximum balancing pressure difference of the battery pack is greater than or equal to the preset balancing pressure difference; when the maximum balancing pressure difference of the battery pack is greater than or equal to the preset balancing pressure difference, sending a balancing start signal to the main control pack balancing central controller.

[0014] In one of the embodiments, the obtaining of the battery pack balancing state parameters of the battery pack group includes: obtaining a maximum value of the battery pack current difference of the battery pack group.

[0015] In one of the embodiments, the battery pack balancing state parameters are balanced and adjusted with preset balancing state parameters to obtain a battery pack balancing adjustment value, including: calculating the adjustment between the maximum flow difference of the battery pack and the preset maximum flow difference to obtain a battery pack balanced maximum flow difference adjustment.

[0016] In one of the embodiments, a balancing start and stop control signal is sent to the main control pack balancing central controller according to the battery pack balancing adjustment amount to adjust the on and off of the balancing circuit of the battery pack to be balanced, including: detecting whether the maximum balancing flow difference adjustment of the battery pack is less than the preset balancing flow difference adjustment; when the maximum balancing flow difference adjustment of the battery pack is less than the preset balancing flow difference adjustment, a balancing shutdown signal is sent to the main control pack balancing central controller.

[0017] A battery pack system balancing monitoring device includes: a balancing acquisition module, a balancing conversion module and a balancing control module; the balancing acquisition module is used to obtain the battery pack balancing state parameters of a battery pack group; the balancing conversion module is used to balance the battery pack balancing state parameters with preset balancing state parameters to obtain the battery pack balancing adjustment value; the balancing control module is used to send a balancing start and close control signal to the main control pack balancing central controller according to the battery pack balancing adjustment value to adjust the on and off of the balancing circuit of the battery pack to be balanced.

[0018] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0019] Obtain the battery pack balancing state parameters of the battery pack group;

[0020] Performing a balance adjustment process on the battery pack balance state parameter and the preset balance state parameter to obtain a battery pack balance adjustment value;

[0021] According to the battery pack balancing adjustment amount, a balancing on / off control signal is sent to the main control pack balancing central controller to adjust the on / off of the balancing circuit of the battery pack to be balanced.

[0022] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the following steps:

[0023] Obtain the battery pack balancing state parameters of the battery pack group;

[0024] Performing a balance adjustment process on the battery pack balance state parameter and the preset balance state parameter to obtain a battery pack balance adjustment value;

[0025] According to the battery pack balancing adjustment amount, a balancing on / off control signal is sent to the main control pack balancing central controller to adjust the on / off of the balancing circuit of the battery pack to be balanced.

[0026] Compared with the prior art, the present invention has at least the following advantages:

[0027] After collecting the battery pack balancing state parameters, the current balanced operation status of the battery packs inside the battery pack group is determined, and then the battery pack balancing state parameters are compared with the standard balanced state parameters to facilitate determining the difference between the current balanced operation status of the battery packs inside the battery pack group and the balanced operation status between standard battery packs. Finally, based on the above difference value, the balancing mode between the battery packs in the battery pack group is optimized and adjusted through the main control pack balancing central controller to keep each battery pack balanced without changing the number of series and parallel cells in the battery pack, which effectively reduces the maintenance difficulty and maintenance cost of the balance between the battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a flow chart of a battery pack system balancing monitoring method in one embodiment;

[0030] Figure 2 is a schematic diagram of a battery pack in one embodiment;

[0031] Figure 3 A connection diagram of a battery pack system in one embodiment;

[0032] Figure 4 A schematic diagram of balancing a battery pack system in a static state in one embodiment;

[0033] Figure 5 A schematic diagram of equalization of a battery pack system in a discharge state in one embodiment;

[0034] Figure 6 A schematic diagram of equalization of a battery pack system in a charging state in an embodiment;

[0035] Figure 7 is an internal structure diagram of a computer device in one embodiment;

[0036] Figure 8 is a circuit diagram of a multi-battery pack balancing circuit in one embodiment;

[0037] Fig. 9 for Figure 1 The circuit diagram of the balancing sub-circuit in the multi-battery pack balancing circuit is shown. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] The present disclosure relates to a battery pack system balancing monitoring method. In one embodiment, the battery pack system balancing monitoring method includes obtaining a battery pack balancing state parameter of a battery pack group; performing a balancing adjustment process on the battery pack balancing state parameter and a preset balancing state parameter to obtain a battery pack balancing adjustment amount; and sending a balancing on / off control signal to a main control pack balancing central controller according to the battery pack balancing adjustment amount to adjust the on / off of a balancing circuit of a battery pack to be balanced. After collecting the battery pack balancing state parameter, the balancing operation status between the current battery packs inside the battery pack group is determined, and then the battery pack balancing state parameter is compared with the standard balancing state parameter to facilitate determining the difference between the balancing operation status between the current battery packs inside the battery pack group and the balancing operation status between the standard battery packs. Finally, according to the above difference value, the balancing mode between the battery packs in the battery pack group is optimized and adjusted through the main control pack balancing central controller so that each battery pack remains balanced without changing the number of series and parallel cells in the battery pack, which effectively reduces the maintenance difficulty and maintenance cost of balancing between battery packs.

[0042] See also Figure 1 , which is a flow chart of a battery pack system balancing monitoring method according to an embodiment of the present disclosure. The battery pack system balancing monitoring method includes part or all of the following steps.

[0043] S100: Obtain battery pack balancing state parameters of a battery pack group.

[0044] In this embodiment, the battery pack balancing state parameter is the current balancing operation data between the battery packs in the battery pack group, that is, the battery pack balancing state parameter is the charge balancing state between the battery packs in the battery pack group, that is, the battery pack balancing state parameter corresponds to the charge balancing state between the battery packs in the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation state between the battery packs in the battery pack group.

[0045] S200: Performing a balancing adjustment process on the battery pack balancing state parameter and the preset balancing state parameter to obtain a battery pack balancing adjustment value.

[0046] In this embodiment, the battery pack balancing state parameter is the current balancing operation data between the battery packs inside the battery pack group, that is, the battery pack balancing state parameter is the charge balancing situation between the battery packs of the battery pack group, that is, the battery pack balancing state parameter corresponds to the charge balancing state between the battery packs of the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation status between the battery packs inside the battery pack group. The preset balancing state parameter is the standard balancing operation data between the battery packs inside the battery pack group, that is, the preset balancing state parameter is the reference charge balancing situation between the battery packs of the battery pack group, that is, the preset balancing state parameter corresponds to the specified charge balancing state between the battery packs of the battery pack group. By performing the balancing adjustment processing on the battery pack balancing state parameter and the preset balancing state parameter, it is convenient to determine the degree of difference in balancing operation between the current battery packs inside the battery pack group.

[0047] S300: Sending a balancing on / off control signal to the main control pack balancing central controller according to the battery pack balancing adjustment value to adjust the on / off of the balancing circuit of the battery pack to be balanced.

[0048] In this embodiment, the battery pack balancing adjustment amount is obtained based on the battery pack balancing state parameter and the preset balancing state parameter. The battery pack balancing state parameter is the balancing operation data between the battery packs in the current battery pack group, that is, the battery pack balancing state parameter is the charge balancing situation between the battery packs in the battery pack group, that is, the battery pack balancing state parameter corresponds to the charge balancing state between the battery packs in the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation situation between the battery packs in the battery pack group. The preset balancing state parameter is the standard balancing operation data between the battery packs in the battery pack group, that is, the preset balancing state parameter is the reference charge balancing situation between the battery packs in the battery pack group, that is, the preset balancing state parameter corresponds to the specified charge balancing state between the battery packs in the battery pack group. By performing the balancing adjustment processing on the battery pack balancing state parameter and the preset balancing state parameter, it is convenient to determine the degree of difference in balancing operation between the battery packs in the current battery pack group. After obtaining the battery pack balancing adjustment value, the current electrical performance differences between the battery packs inside the battery pack group can be determined, so that the balancing circuit control of the battery pack that needs to be balanced can be adjusted by sending the balancing start and close control signal, so that the electrical performance of each battery pack remains consistent.

[0049] In the above embodiment, after the battery pack balancing state parameters are collected, the current balanced operation status between the battery packs inside the battery pack group is determined, and then the battery pack balancing state parameters are compared with the standard balanced state parameters to facilitate determining the difference between the current balanced operation status between the battery packs inside the battery pack group and the balanced operation status between the standard battery packs. Finally, based on the above difference value, the balancing mode between the battery packs in the battery pack group is optimized and adjusted through the main control pack balancing central controller to keep each battery pack balanced without changing the number of series and parallel cells in the battery pack, which effectively reduces the maintenance difficulty and maintenance cost of the balance between the battery packs.

[0050] In one of the embodiments, the obtaining of the battery pack balancing state parameters of the battery pack group includes: obtaining the maximum value of the battery pack voltage difference of the battery pack group. In this embodiment, the battery pack balancing state parameters are the current balancing operation data between the battery packs inside the battery pack group, that is, the battery pack balancing state parameters are the charge balancing conditions between the battery packs of the battery pack group, that is, the battery pack balancing state parameters correspond to the charge balancing conditions between the battery packs of the battery pack group. By collecting the battery pack balancing state parameters, it is convenient to determine the current balancing operation conditions between the battery packs inside the battery pack group. The battery pack balancing state parameters include the maximum value of the battery pack voltage difference of the battery pack group, and the maximum value of the battery pack voltage difference is the maximum voltage difference between the battery packs of the battery pack group, that is, the maximum value of the battery pack voltage difference is the voltage difference between the highest voltage battery pack and the lowest voltage battery pack in the battery pack group. By collecting the maximum value of the battery pack voltage difference, it is convenient to determine the maximum voltage difference between the battery packs of the battery pack group.

[0051] Further, the said balancing and adjusting the battery pack balancing state parameter with the preset balancing state parameter to obtain the battery pack balancing adjustment amount includes: obtaining the adjustment of the maximum pressure difference of the battery pack with the preset maximum pressure difference to obtain the battery pack balancing maximum pressure difference adjustment. In this embodiment, the battery pack balancing state parameter is the balancing operation data between the current internal battery packs of the battery pack group, that is, the battery pack balancing state parameter is the charge balancing condition between the battery packs of the battery pack group, that is, the battery pack balancing state parameter corresponds to the charge balancing condition between the battery packs of the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation condition between the battery packs of the battery pack group. The preset balancing state parameter is the standard balancing operation data between the internal battery packs of the battery pack group, that is, the preset balancing state parameter is the reference charge balancing condition between the battery packs of the battery pack group, that is, the preset balancing state parameter corresponds to the specified charge balancing condition between the battery packs of the battery pack group. By performing a balance adjustment process on the battery pack balance state parameters and the preset balance state parameters, it is convenient to determine the degree of balance operation difference between the current internal battery packs of the battery pack group. The battery pack balance state parameters include the maximum battery pack pressure difference of the battery pack group. The maximum battery pack pressure difference is the maximum voltage difference between the battery packs of the battery pack group, that is, the maximum battery pack pressure difference is the voltage difference between the highest voltage battery pack and the lowest voltage battery pack in the battery pack group. By collecting the maximum battery pack pressure difference, it is convenient to determine the maximum voltage difference between the battery packs of the battery pack group. By obtaining the balance of the maximum battery pack pressure difference and the preset maximum pressure difference, it is convenient to determine the degree of difference between the maximum voltage difference between the battery packs of the battery pack group and the standard maximum pressure difference.

[0052] Furthermore, the sending of a balancing start and stop control signal to the main control pack balancing central controller according to the battery pack balancing adjustment amount to adjust the on and off of the balancing circuit of the battery pack to be balanced includes: detecting whether the battery pack balancing maximum pressure difference adjustment is greater than or equal to the preset balancing pressure difference adjustment; when the battery pack balancing maximum pressure difference adjustment is greater than or equal to the preset balancing pressure difference adjustment, sending a balancing start signal to the main control pack balancing central controller. In this embodiment, the battery pack balancing adjustment amount is obtained based on the battery pack balancing state parameter and the preset balancing state parameter, and the battery pack balancing state parameter is the balancing operation data between the current internal battery packs of the battery pack group, that is, the battery pack balancing state parameter is the battery pack charge balancing status between the battery packs of the battery pack group, that is, the battery pack balancing state parameter corresponds to the battery pack charge balancing status between the battery packs of the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation status between the internal battery packs of the battery pack group. The preset balancing state parameters are standard balancing operation data between the battery packs inside the battery pack group, that is, the preset balancing state parameters are reference power balancing conditions between the battery packs of the battery pack group, that is, the preset balancing state parameters correspond to the specified power balancing conditions between the battery packs of the battery pack group. By performing a balancing adjustment process on the battery pack balancing state parameters and the preset balancing state parameters, it is convenient to determine the degree of difference in balancing operation between the current battery packs inside the battery pack group. After obtaining the battery pack balancing adjustment amount, the difference in electrical performance between the current battery packs inside the battery pack group is determined, so that the balancing circuit control of the battery pack that needs to be balanced can be adjusted by sending the balancing start and close control signal, so that the electrical performance of each battery pack remains consistent. The battery pack balancing state parameter includes the maximum voltage difference of the battery pack of the battery pack group, and the maximum voltage difference of the battery pack is the maximum voltage difference between the battery packs of the battery pack group, that is, the maximum voltage difference of the battery pack is the voltage difference between the highest voltage battery pack and the lowest voltage battery pack in the battery pack group. By collecting the maximum voltage difference of the battery pack, it is convenient to determine the maximum voltage difference between the battery packs of the battery pack group. By obtaining the difference between the maximum voltage difference of the battery pack and the preset maximum voltage difference, it is convenient to determine the difference between the maximum voltage difference between the battery packs of the battery pack group and the standard maximum voltage difference. The battery pack balancing maximum voltage difference difference is greater than or equal to the preset balancing voltage difference difference, indicating that the maximum voltage difference between the battery packs of the battery pack group is too large, that is, it indicates that the voltage difference of at least two battery packs in the battery pack group exceeds the predetermined maximum voltage difference. At this time, a balancing start signal is sent to the main control pack balancing central controller to start the balancing circuit between the corresponding battery packs, so that the two battery packs with a pressure difference exceeding the maximum pressure difference maintain balance.

[0053] In another embodiment, when the maximum balanced pressure difference of the battery pack is less than the preset balanced pressure difference, a balanced shutdown signal is sent to the main control pack balanced central controller to ensure the balance between the battery packs.

[0054] In one of the embodiments, the obtaining of the battery pack balancing state parameters of the battery pack group includes: obtaining the maximum value of the battery pack current difference of the battery packs of the battery pack group. In this embodiment, the battery pack balancing state parameters are the current balancing operation data between the battery packs inside the battery pack group, that is, the battery pack balancing state parameters are the charge balancing conditions between the battery packs of the battery pack group, that is, the battery pack balancing state parameters correspond to the charge balancing conditions between the battery packs of the battery pack group. By collecting the battery pack balancing state parameters, it is convenient to determine the current balancing operation conditions between the battery packs inside the battery pack group. The battery pack balancing state parameters include the maximum value of the battery pack current difference of the battery pack group, and the maximum value of the battery pack current difference is the maximum current difference between the battery packs of the battery pack group, that is, the maximum value of the battery pack current difference is the current difference between the highest current battery pack and the lowest current battery pack in the battery pack group. By collecting the maximum value of the battery pack current difference, it is convenient to determine the maximum current difference between the battery packs of the battery pack group.

[0055] Further, the said balancing adjustment processing of the battery pack balancing state parameter and the preset balancing state parameter to obtain the battery pack balancing adjustment amount includes: obtaining the adjustment of the maximum flow difference of the battery pack and the preset maximum flow difference to obtain the battery pack balancing maximum flow difference adjustment. In this embodiment, the battery pack balancing state parameter is the balancing operation data between the current internal battery packs of the battery pack group, that is, the battery pack balancing state parameter is the charge balancing condition between the battery packs of the battery pack group, that is, the battery pack balancing state parameter corresponds to the charge balancing condition between the battery packs of the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation condition between the internal battery packs of the battery pack group. The preset balancing state parameter is the standard balancing operation data between the internal battery packs of the battery pack group, that is, the preset balancing state parameter is the reference charge balancing condition between the battery packs of the battery pack group, that is, the preset balancing state parameter corresponds to the specified charge balancing condition between the battery packs of the battery pack group. By performing a balancing and adjustment process on the battery pack balancing state parameters and the preset balancing state parameters, it is convenient to determine the degree of balancing operation difference between the current internal battery packs of the battery pack group. The battery pack balancing state parameters include the maximum value of the battery pack current difference of the battery pack group, and the maximum value of the battery pack current difference is the maximum current difference between the battery packs of the battery pack group, that is, the maximum value of the battery pack current difference is the current difference between the highest current battery pack and the lowest current battery pack in the battery pack group. By collecting the maximum value of the battery pack current difference, it is convenient to determine the maximum current difference between the battery packs of the battery pack group. By taking the adjustment of the maximum value of the battery pack current difference and the preset maximum value of the current difference, it is convenient to determine the degree of difference between the maximum current difference between the battery packs of the battery pack group and the standard maximum current difference.

[0056] Furthermore, the balancing start and stop control signal is sent to the main control pack balancing central controller according to the battery pack balancing adjustment amount to adjust the on and off of the balancing circuit of the battery pack to be balanced, including: detecting whether the maximum flow difference adjustment of the battery pack balancing is less than the preset balancing flow difference adjustment; when the maximum flow difference adjustment of the battery pack balancing is less than the preset balancing flow difference adjustment, sending a balancing shutdown signal to the main control pack balancing central controller. In this embodiment, the battery pack balancing adjustment amount is obtained based on the battery pack balancing state parameter and the preset balancing state parameter, and the battery pack balancing state parameter is the balancing operation data between the current internal battery packs of the battery pack group, that is, the battery pack balancing state parameter is the battery pack charge balancing status between the battery packs of the battery pack group, that is, the battery pack balancing state parameter corresponds to the battery pack charge balancing status between the battery packs of the battery pack group. By collecting the battery pack balancing state parameter, it is convenient to determine the current balancing operation status between the internal battery packs of the battery pack group. The preset balancing state parameters are standard balancing operation data between the battery packs inside the battery pack group, that is, the preset balancing state parameters are reference power balancing conditions between the battery packs of the battery pack group, that is, the preset balancing state parameters correspond to the specified power balancing conditions between the battery packs of the battery pack group. By performing a balancing adjustment process on the battery pack balancing state parameters and the preset balancing state parameters, it is convenient to determine the degree of difference in balancing operation between the current battery packs inside the battery pack group. After obtaining the battery pack balancing adjustment amount, the difference in electrical performance between the current battery packs inside the battery pack group is determined, so that the balancing circuit control of the battery pack that needs to be balanced can be adjusted by sending the balancing start and close control signal, so that the electrical performance of each battery pack remains consistent. The battery pack balancing state parameter includes the maximum value of the battery pack current difference of the battery pack group, and the maximum value of the battery pack current difference is the maximum current difference between the battery packs of the battery pack group, that is, the maximum value of the battery pack current difference is the current difference between the highest current battery pack and the lowest current battery pack in the battery pack group. By collecting the maximum value of the battery pack current difference, it is convenient to determine the maximum current difference between the battery packs of the battery pack group. By taking the difference between the maximum value of the battery pack current difference and the preset maximum value of the current difference, it is convenient to determine the degree of difference between the maximum current difference between the battery packs of the battery pack group and the standard maximum current difference. The battery pack balancing maximum current difference difference difference is less than the preset balancing current difference difference difference, indicating that the maximum current difference between the battery packs of the battery pack group is small, that is, it indicates that the current difference of at least two battery packs in the battery pack group is within the predetermined maximum current difference range. At this time, by sending a balancing shutdown signal to the main control pack balancing central controller, the balancing between the battery packs is ensured.

[0057] In another embodiment, when the battery pack balancing maximum flow difference adjustment is greater than or equal to the preset balancing flow difference adjustment, it indicates that the maximum flow difference between the battery packs in the battery pack group is too large, that is, it indicates that the flow difference of at least two battery packs in the battery pack group exceeds the predetermined maximum flow difference. At this time, a balancing start signal is sent to the main control pack balancing central controller to start the corresponding balancing circuit between the battery packs, so that the two battery packs with the flow difference exceeding the maximum flow difference maintain balance.

[0058] During the actual system balancing process of the battery pack group, the change in the pressure difference between the battery packs of the battery pack is affected by the current charge and discharge status, and it is easy to temporarily exceed the maximum pressure difference. However, it will return to balance due to external power replenishment or external discharge. If the pressure difference change occurring at this time is identified as requiring balancing operation, the balancing modules or balancing switches on some battery packs will be frequently opened or disconnected, resulting in too many invalid balancing times during use, and further increasing the power consumption used for balancing.

[0059] In order to reduce the power consumption during the balancing process, the method further includes the following steps: sending a balancing start and stop control signal to the main control pack balancing central controller according to the balancing adjustment amount of the battery pack to adjust the on and off of the balancing circuit of the battery pack to be balanced:

[0060] Obtaining the balanced overvoltage time of the battery pack;

[0061] Detecting whether the balanced overpressure time is less than or equal to a preset overpressure time;

[0062] When the equalization overvoltage time is less than or equal to the preset overvoltage time, a packet-to-packet equalization prohibition signal is sent to the main control packet balancing central controller.

[0063] In this embodiment, the balanced overvoltage time is the duration of voltage overvoltage of at least two battery packs in the battery pack group, that is, the balanced overvoltage time is the continuous duration of excessive voltage difference between battery packs in the battery pack group. The preset overvoltage time is the specified time when excessive voltage difference occurs between battery packs in the battery pack group. The balanced overvoltage time is less than or equal to the preset overvoltage time, indicating that the duration of voltage overvoltage of any two battery packs in the battery pack group is less than the specified time, that is, the overvoltage time between battery packs in the battery pack group is too short. At this time, the electrical properties of the current two battery packs in the battery pack group are balanced by themselves, and the inter-pack balancing prohibition signal is sent to the main control pack balancing central controller to reduce the balancing energy consumption between the battery packs in the battery pack group that are currently temporarily over-voltage.

[0064] Furthermore, the detecting whether the balanced overpressure time is less than or equal to the preset overpressure time further includes:

[0065] When the overpressure equalization time is greater than the preset overpressure time, obtaining the overpressure equalization time of the battery pack;

[0066] Detecting whether the equalization pressure-leveling time is greater than or equal to a preset pressure-leveling time;

[0067] When the equalization and leveling time is greater than or equal to the preset leveling time, a packet group equalization signal is sent to the main control packet balancing central controller.

[0068] In this embodiment, the equalization overvoltage time is greater than the preset overvoltage time, indicating that there is a continuous overvoltage between the two current battery packs in the battery pack group. At this time, the battery pack continues to perform equalization operations to eliminate the overvoltage between the two battery packs. In the process of continuous equalization, the charges between the battery packs are continuously exchanged to reach equilibrium, which is prone to secondary overvoltage, that is, the original high-voltage battery pack is converted into a low-voltage battery pack after equalization. By collecting the equalization voltage leveling time, it is convenient to determine the voltage balance duration between the two current battery packs in the battery pack group during the equalization process. The equalization voltage leveling time is greater than or equal to the preset voltage leveling time, indicating that the voltage balance duration between the two current battery packs in the battery pack group is longer, that is, it indicates that the battery packs of the battery pack group maintain a stable balanced state. At this time, by sending a pack group equalization signal to the main control pack balancing central controller to end the balancing operation of the current battery pack group, it is convenient to balance the battery packs of other subsequent battery packs.

[0069] In another embodiment, when the equalization and leveling time is less than the preset leveling time, step S300 is executed.

[0070] In another embodiment, see Figure 2 The battery pack includes a cell module 01, a main control module 02, a balancing module 03, a communication module 04, a charge and discharge switch 11, a balancing positive end control switch 12, a balancing negative end control switch 13, a positive electrode port 21, a negative electrode port 22, a first balancing port 23 and a second balancing port 24.

[0071] The main control module 01 is composed of a sampling chip and an MCU (microcontroller unit), i.e., a peripheral circuit, and is used to collect information such as battery voltage and current, estimate battery power, send and receive data information, and control other modules and switches. The communication module 04 is composed of a CAN transceiver chip and its peripheral circuits, and is used to realize the mutual conversion between the digital signal that the MCU can recognize and the electrical signal transmitted in the CAN bus, and to help the battery pack communicate with external devices.

[0072] The balancing module 03 is a switching power supply circuit, which is composed of a control chip and a switching circuit. It realizes the functions of voltage boost, voltage reduction and voltage stabilization, outputs a unidirectional stable current, and has the function of power supply isolation.

[0073] Among them, the negative electrode of the battery cell module 01 is connected to the negative electrode port 22, and is also connected to the balanced negative electrode line VB- through the balanced negative terminal control switch 13. The positive electrode is connected to the positive electrode port 21 through the charge and discharge switch 11, and is connected to the balanced positive electrode line VB+ through the balanced positive terminal control switch 12. The positive and negative electrodes of the input end of the balancing module 03 are respectively connected to the positive and negative electrodes of the battery cell module 01, and the positive and negative electrodes of the output end are respectively connected to the balanced positive electrode line VB+ and the balanced negative electrode line VB-.

[0074] The charge and discharge switch 11 , the balanced positive end control switch 12 and the balanced negative end control switch 13 are all composed of MOS tubes (metal-oxide semiconductor field effect tubes) and their peripheral drive circuits, and their opening and closing states are controlled by the main control module 02 .

[0075] The above battery packs form a multi-series and parallel battery pack system. Figure 3 For example, the battery pack system consists of four battery strings S1 to S4 connected in parallel, where each battery string consists of four single battery packs connected in series. The line connection steps of the battery pack system are as follows:

[0076] 1. The battery packs are divided into four groups S1-S4. In each group, the positive ports 21 of the highest potential battery packs PACK1, PACK5, PACK9, and PACK13 are connected to form the total positive pole of the battery pack system, and the negative ports 22 of the lowest potential battery packs PACK4, PACK8, PACK12, and PACK16 are connected to form the total negative pole of the battery pack system. The remaining positive and negative ports are connected in such a way that the positive port 21 is connected to the negative port 22 of the adjacent battery pack in the same group, and the battery pack system is connected to the external charging and discharging circuit.

[0077] Second, in each battery group, except for the first balancing port 23 of the highest potential battery pack PACK1, PACK5, PACK9, PACK13 and the second balancing port 24 of the lowest potential battery pack PACK4, PACK8, PACK12, PACK16, the remaining balancing ports are connected in the manner that the first balancing port 23 is connected to the second balancing port 24 of the adjacent battery in the same group; the second balancing port 24 of the battery PACK4 in the first battery group S1 is connected to the second balancing port 24 of the battery PACK8 in the second battery group S2, the first balancing port 23 of the battery PACK5 in the second battery group S2 is connected to the first balancing port 23 of the battery PACK9 in the third battery group S3, and the second balancing port 24 of the battery PACK12 in the third battery group S3 is connected to the second balancing port 24 of the battery PACK16 in the fourth battery group S4. At this point, the balancing circuit part of the battery pack system is connected, and all battery packs are connected in parallel on the balancing path.

[0078] 3. The CAN communication modules 04 of all battery packs are connected via a CAN bus to form a CAN communication architecture. Preferably, in this embodiment, the CAN bus and the balancing line are integrated on the same bus. Therefore, when the balancing path connection is completed, the communication line connection is also completed, which reduces the wiring steps in practical applications.

[0079] The specific implementation of the battery pack system balancing monitoring method is as follows:

[0080] After completing the above-mentioned line connection, the battery pack PACK1 in the first battery group S1 automatically becomes the master battery pack of the battery pack system, and the remaining battery packs become slave battery packs of the battery pack system. The master battery pack assigns communication addresses to all battery packs, and all batteries form a connection relationship in terms of communication signals.

[0081] In the initial state, the balancing modules 03 of all battery packs in the battery pack system are turned off, and the charge and discharge switch 11, the balancing positive end control switch 12 and the balancing negative end control switch 13 are disconnected.

[0082] All battery packs collect their own voltage, overcurrent, temperature and other status information through the main control module 02 and calculate the battery pack power, and then send the above information to the main control battery pack through the communication module 04. The main control battery pack collects the status information of all battery packs, and selects the highest voltage battery pack and the lowest voltage battery pack, and the highest voltage battery pack is battery pack a, and the lowest voltage battery pack is battery pack b.

[0083] Calculate the voltage difference between battery pack a and battery pack b: ΔV = Va - Vb.

[0084] If ΔV>V1 and the duration exceeds t1, where V1 is the equalization start-up voltage difference threshold, it is determined that the internal equalization mode of the battery pack system needs to be turned on, and t1 is the preset overvoltage time.

[0085] The master control battery pack sends an action instruction to battery pack a and battery pack b. After receiving the instruction, battery pack a turns on the balancing module 03. After receiving the instruction, battery pack b closes the balancing positive end control switch 12 and the balancing negative end control switch 13. The balancing circuit between battery pack a and battery pack b is turned on. At this time, the input voltage of the balancing module 03 of battery pack a is the voltage across the battery cell module 01 of battery pack a, and the output voltage of the balancing module 03 is applied to the battery cell module 01 of battery pack b.

[0086] When the battery pack a turns on the balancing module 03, the battery pack a controls the output voltage of the balancing module 03 to match the voltage of the battery pack b, so as to avoid the surge current that damages the battery pack when the balancing line is turned on.

[0087] If the battery pack system is in a static state, that is, it is neither charged by an external power source nor discharged to an external load, please refer to Figure 4 The input voltage of the balancing module 03 of battery pack a is the voltage of the cell module 01 , and the output voltage is applied to both ends of the cell module 01 of battery pack b and is greater than its open circuit voltage. Battery pack a charges battery pack b through the balancing module 03 .

[0088] If the battery pack system is in a discharging state, please refer to Figure 5 , the charge and discharge switches 11 of all battery packs are closed. For battery pack a, part of the discharge current of the cell module 01 is discharged from the positive and negative ends of the battery pack to the outside, and part of it flows to the cell module of battery pack b through the balancing module 03. At this time, the voltage drop across the cell module 01 of battery pack b is the output voltage of the balancing module 03 of battery pack a and is greater than its own open circuit voltage. Part of the output current of the balancing module 03 of battery pack a is used to charge battery pack b, and part of it flows out from the positive and negative ends of battery pack b to become the discharge current of the battery string where battery pack b is located.

[0089] If the battery pack system is in charging state at this time, please refer to Figure 6, the charge and discharge switches 11 of all battery packs are closed. For battery pack a, part of the charging current flowing into battery pack a flows to the cell module 01 to charge it, and part flows to the cell module 01 of battery pack b through the balancing module 03. The current actually charging the cell module 01 of battery pack a is equal to the charging current of the battery string where battery pack a is located minus the current flowing to the balancing module 03; the charging current of battery b is equal to the charging current of the battery string where battery b is located plus the output current of the balancing module 03 of battery pack a. This process transfers part of the charging current flowing to battery pack a to battery pack b, reducing the charging current of battery pack a and increasing the charging current of battery pack b, thereby achieving the effect of balanced charging.

[0090] During the balancing process, the main control module 02 of battery pack b collects the charging current of battery pack b and feeds back the above current information to battery pack a through the CAN bus. The main control module 02 of battery pack a calculates the charging current required by battery pack b according to the current state of the battery pack system and the voltage of battery pack b, controls and adjusts the duty cycle of the PWM control signal of the balancing module 03, changes the output voltage of the balancing module 03, and further changes the charging current of battery pack b, so that the charging current of battery pack b is maintained within the target range, realizing constant current balanced charging.

[0091] At the same time, the master battery continuously receives voltage information sent by all battery packs in the battery pack system. If the voltage of battery pack a is greater than that of other battery packs and the voltage of battery pack b is less than that of other battery packs, and the condition is not met and lasts for more than t2, a command is sent to turn off the balancing module 03 of battery pack a, disconnect the balancing positive terminal control switch 12 and the balancing negative terminal control switch 13 of battery pack b, and balancing is suspended. Then, the current highest voltage battery pack and the lowest voltage battery pack are made into the new battery pack a and battery pack b, and a command is sent to turn on the balancing module 03 of the new battery pack a, close the balancing positive terminal control switch 12 and the balancing negative terminal control switch 13 of the new battery pack b, and balancing continues.

[0092] When ΔV<V2, and the duration exceeds t3, where t3 is the preset voltage leveling time and V2 is the voltage difference threshold for the end of balancing, it is determined that balancing is completed, and the main control battery pack sends an instruction to turn off the balancing module 03 of battery pack a, disconnect the balancing positive terminal control switch 12 and the balancing negative terminal control switch 13 of battery pack b, and balancing is completed.

[0093] The voltage difference thresholds V1, V2, and times t1, t2, t3 mentioned above are set by the program code of the battery pack main control module 02. It should also be noted that the above-mentioned balancing process is performed when the battery pack has no faults and no battery protection is triggered.

[0094] The above-mentioned various preset variables are all set in the database for timely retrieval, and different preset variables are placed in different storage units, that is, in different storage stacks. Moreover, the balanced overpressure time and the balanced flat pressure time can be collected through corresponding detectors, for example, through the timer in the balanced acquisition module.

[0095] In one of the embodiments, the present disclosure also relates to a battery pack system balancing monitoring device, including: a balancing acquisition module, a balancing conversion module and a balancing control module; the balancing acquisition module is used to obtain the battery pack balancing state parameters of the battery pack group; the balancing conversion module is used to balance the battery pack balancing state parameters with the preset balancing state parameters to obtain the battery pack balancing adjustment amount; the balancing control module is used to send a balancing start and close control signal to the main control pack balancing central controller according to the battery pack balancing adjustment amount to adjust the on and off of the balancing circuit of the battery pack to be balanced.

[0096] In this embodiment, after the balancing acquisition module collects the battery pack balancing state parameters, the current balancing operation status between the battery packs inside the battery pack group is determined, and then the balancing conversion module compares the battery pack balancing state parameters with the standard balancing state parameters to facilitate determining the difference between the current balancing operation status between the battery packs inside the battery pack group and the balancing operation status between the standard battery packs. Finally, the balancing control module optimizes and adjusts the balancing mode between the battery packs in the battery pack group according to the above difference value through the main control pack balancing central controller, so that each battery pack remains balanced without changing the number of series and parallel cells in the battery pack, effectively reducing the maintenance difficulty and maintenance cost of the balance between the battery packs.

[0097] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor, a memory and a network interface connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as battery pack balancing state parameters, battery pack balancing adjustment quantities, and balancing start and close control signals. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery pack system balancing monitoring method is implemented.

[0098] Those skilled in the art will understand that Figure 7The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0099] In one of the embodiments, the present application further provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0100] In one of the embodiments, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0101] In one embodiment, see Figure 8 , which is a circuit diagram of a multi-battery pack balancing circuit of an embodiment of the present disclosure. The multi-battery pack balancing circuit is applied to the above-mentioned battery pack system balancing monitoring method and battery pack system.

[0102] The multi-battery pack balancing circuit 10 of one embodiment includes a plurality of balancing sub-circuits. Fig. 9Each of the balancing sub-circuits includes a cell module, a balancing transformer T1, a primary-side electronic switch tube Q1, a balancing positive-end switch, a balancing negative-end switch, an output rectifier diode D2, and an output capacitor C2, and a plurality of the battery packs are connected in series and / or in parallel. The positive electrode P+ of the cell module is connected to the second end of the primary side of the balancing transformer T1, the first end of the primary side of the balancing transformer T1 is connected to the first end of the primary-side electronic switch tube Q1, the second end of the primary-side electronic switch tube Q1 is connected to the negative electrode P- of the cell module, and the control end of the primary-side electronic switch tube Q1 is used to be connected to the first PWM control end of the balancing controller. The first end of the secondary side of the balancing transformer T1 is connected to the positive electrode of the output rectifier diode D2, the negative electrode of the output rectifier diode D2 is connected to the first end of the output capacitor C2, the first end of the output capacitor C2 is also connected to the first end of the output capacitor C2 of other balancing sub-circuits, the second end of the output capacitor C2 is connected to the second end of the secondary side of the balancing transformer T1, and the second end of the output capacitor C2 is also connected to the second end of the output capacitor C2 of other balancing sub-circuits. The positive electrode P+ of the battery module is also connected to the first end of the balancing positive end switch, the second end of the balancing positive end switch is connected to the first end of the output capacitor C2, and the control end of the balancing positive end switch is used to connect to the positive end switch control end of the balancing controller. The negative electrode P- of the battery module is also connected to the first end of the balancing negative end switch, the second end of the balancing negative end switch is connected to the second end of the output capacitor C2, and the control end of the balancing negative end switch is used to connect to the negative end switch control end of the balancing controller.

[0103] In this embodiment, during balancing, the balancing positive switch and the balancing negative switch corresponding to the high-voltage battery pack in the two target balancing battery packs are turned off, and the balancing positive switch and the balancing negative switch corresponding to the low-voltage battery pack in the two target balancing battery packs are turned on. By controlling the on-off of the primary-side electronic switch tube Q1 corresponding to the high-voltage battery pack in the two target balancing battery packs, the electric energy output from the secondary side of the high-voltage battery pack transformer is transmitted to the low-voltage battery pack through the balancing positive switch and the balancing negative switch of the low-voltage battery pack. Moreover, since the balancing circuit is separated from the external charging and discharging circuit of the battery pack, the mutually balanced battery packs can be balanced regardless of whether they are in a static state or a charging and discharging state, which has the advantages of high balancing efficiency and good flexibility. In addition, the balancing circuits of the two target balancing battery packs are connected through a transformer. Due to the isolation effect of the transformer, the selection of the two target battery packs is not affected by the position of the battery pack in the battery system, and the balancing between any two battery packs is achieved. Moreover, during balancing, the balancing positive switch and the balancing negative switch of the low-voltage battery pack are continuously turned on, which is equivalent to the positive and negative poles of the low-voltage battery pack cells being directly connected to the output end of the high-voltage battery pack switching power supply, and the energy output by the transformer is directly used to charge the low-voltage battery pack.

[0104] In another embodiment, each of the battery packs mentioned above includes the multi-battery pack balancing circuit mentioned above, that is, each battery pack includes a battery cell module and a balancing circuit.

[0105] In another embodiment, the primary side electronic switch tube Q1 is an N-type MOS tube, the first end of the primary side electronic switch tube Q1 is the drain of the N-type MOS tube, the second end of the primary side electronic switch tube Q1 is the source of the N-type MOS tube, and the control end of the primary side electronic switch tube Q1 is the gate of the N-type MOS tube.

[0106] In one embodiment, see Fig. 9 , the balancing subcircuit also includes a balancing current detection resistor R2, and the second end of the primary-side electronic switch tube Q1 is connected to the negative electrode P- of the battery module through the balancing current detection resistor R2. In this embodiment, the balancing current detection resistor R2 is connected in series to the second end of the primary-side electronic switch tube Q1, and the balancing current detection resistor R2 serves as a detection resistor for the current between the second end of the primary-side electronic switch tube Q1 and the negative electrode P- of the battery module. Specifically, the current detection end of the balancing controller is connected in parallel to the two ends of the balancing current detection resistor R2. By collecting the voltage on the balancing current detection resistor R2, it is convenient to determine the current output by the high-voltage battery pack in the two target balancing battery packs during the balancing process.

[0107] In one embodiment, see Fig. 9The balancing subcircuit further includes a low-voltage battery current-sensing resistor R6, through which the negative electrode of the battery cell module is connected to the first end of the balancing negative switch, and the detection end of the low-voltage battery current-sensing resistor R6 is connected to the low-voltage feedback end of the balancing controller. The low-voltage battery current-sensing resistor R6 is used to detect the balancing current output by the low-voltage battery packs in the two target balancing battery packs during the balancing process.

[0108] In one embodiment, see Fig. 9 , the balancing sub-circuit also includes a first feedback resistor R5 and a second feedback resistor R4, the first end of the inductive side of the balancing transformer T1 is connected to the first end of the first feedback resistor R5, the second end of the inductive side of the balancing transformer T1 is connected to the negative electrode of the battery module, the second end of the first feedback resistor R5 is connected to the negative electrode of the battery module through the second feedback resistor R4, and the second end of the first feedback resistor R5 is used to connect to the balanced feedback detection end of the balanced controller. In this embodiment, the first feedback resistor R5 and the second feedback resistor R4 are connected in series on the inductive side of the balancing transformer T1, and the inductive side of the balancing transformer T1 serves as the feedback side for balanced electric energy. The first feedback resistor R5 and the second feedback resistor R4 form a voltage-dividing feedback circuit, which is convenient for proportional feedback detection of the output voltage of the inductive side of the balancing transformer T1, so as to improve the detection accuracy of the balanced voltage and current of the battery module.

[0109] In another embodiment, the primary side first end, the secondary side first end and the inductive side first end of the balancing transformer are like-named ends, and the primary side second end, the secondary side second end and the inductive side second end of the balancing transformer are different-named ends.

[0110] Furthermore, the balancing subcircuit further includes a feedback diode D3, the first end of the sensing side of the balancing transformer T1 is connected to the positive electrode of the feedback diode D3, and the negative electrode of the feedback diode D3 is connected to the first end of the first feedback resistor R5. In this embodiment, when the primary-side electronic switch tube Q1 is turned on, the feedback diode D3 is reverse biased, so that the electric energy output by the battery module is stored in the primary side of the balancing transformer T1. When the primary-side electronic switch tube Q1 is turned off, the sensing side of the balancing transformer T1 receives feedback, which is convenient for monitoring the balancing operation state.

[0111] In another embodiment, the output rectifier diode D2 has a similar function to the feedback diode D3. When the primary-side electronic switch tube Q1 is turned on, the output rectifier diode D2 is also reverse biased; and when the primary-side electronic switch tube Q1 is turned off, the output rectifier diode D2 is forward biased, which is convenient for outputting the electric energy of the primary side of the balancing transformer T1 to the output capacitor C2. Moreover, it is transmitted to the load end, that is, the low-voltage battery pack in the target balancing battery pack, through the output capacitor, and the output capacitor is charged at the same time. In the next cycle, the output rectifier diode D2 is reverse biased, and the output current is provided by the output capacitor, so that the output DC power supply is output.

[0112] In one embodiment, see Fig. 9 The balancing subcircuit further includes an absorption resistor R3 and an absorption capacitor C3. The first end of the secondary side of the balancing transformer T1 is connected to the first end of the absorption resistor R3, and the second end of the absorption resistor R3 is connected to the cathode of the output rectifier diode D2 through the absorption capacitor C3. In this embodiment, the absorption resistor R3 and the absorption capacitor C3 are connected in series to form an absorption circuit for the secondary side of the balancing transformer T1, which plays a role in absorbing pulses, improving output stability, and reducing radiation.

[0113] In one embodiment, see Fig. 9 , the balanced positive-end switch comprises a first positive-end electronic switch tube Q2 and a second positive-end electronic switch tube Q3, the positive electrode P+ of the battery module is connected to the second end of the first positive-end electronic switch tube Q2, the first end of the first positive-end electronic switch tube Q2 is connected to the first end of the second positive-end electronic switch tube Q3, and the second end of the second positive-end electronic switch tube Q3 is connected to the first end of the output capacitor C2. In this embodiment, the first positive-end electronic switch tube Q2 and the second positive-end electronic switch tube Q3 are P-type MOS tubes, the first end of the first positive-end electronic switch tube Q2 and the first end of the second positive-end electronic switch tube Q3 are drains of the P-type MOS tube, the second end of the first positive-end electronic switch tube Q2 and the second end of the second positive-end electronic switch tube Q3 are sources of the P-type MOS tube, and the control end of the first positive-end electronic switch tube Q2 and the control end of the second positive-end electronic switch tube Q3 are gates of the P-type MOS tube. By connecting the first positive-end electronic switch tube Q2 and the second positive-end electronic switch tube Q3 in reverse series, it is convenient to perform charge and discharge balance control on the positive end of the battery cell module.

[0114] In one embodiment, see Fig. 9, the balanced negative-end switch comprises a first negative-end electronic switch tube Q4 and a second negative-end electronic switch tube Q5, the negative electrode P- of the battery module is connected to the second end of the first negative-end electronic switch tube Q4, the first end of the first negative-end electronic switch tube Q4 is connected to the first end of the second negative-end electronic switch tube Q5, and the second end of the second negative-end electronic switch tube Q5 is connected to the second end of the output capacitor C2. In this embodiment, the first negative-end electronic switch tube Q4 and the second negative-end electronic switch tube Q5 are P-type MOS tubes, the first end of the first negative-end electronic switch tube Q4 and the first end of the second negative-end electronic switch tube Q5 are drains of the P-type MOS tube, the second end of the first negative-end electronic switch tube Q4 and the second end of the second negative-end electronic switch tube Q5 are sources of the P-type MOS tube, and the control end of the first negative-end electronic switch tube Q4 and the control end of the second negative-end electronic switch tube Q5 are gates of the P-type MOS tube. By connecting the first negative-end electronic switch tube Q4 and the second negative-end electronic switch tube Q5 in reverse series, it is convenient to perform charge and discharge balance control on the negative end of the battery cell module.

[0115] In another embodiment, after the two battery packs receive the balancing instruction sent by the master battery pack: for the high-voltage battery pack in the two target balancing battery packs, the control voltage is output through the positive switch control terminal and the negative switch control terminal of the balancing controller, so that the first positive electronic switch tube Q2, the second positive electronic switch tube Q3, the first negative electronic switch tube Q4 and the second negative electronic switch tube Q5 are turned off, and the balancing controller simultaneously outputs a PWM drive signal to the primary side electronic switch tube Q1. When the primary side electronic switch tube Q1 is turned on, the battery charges the primary coil and stores energy. Since the output rectifier diode D2 and the feedback diode D3 are reverse biased, no current flows through the secondary coil. ; When the primary-side electronic switch tube Q1 is turned off, the polarity of the primary coil is reversed, the output rectifier diode D2 and the feedback diode D3 are forward biased, and the energy stored in the primary is output to the load through the output rectifier diode D2, that is, output to the high-voltage battery pack in the two target balanced battery packs, and the output capacitor C2 is charged at the same time. On the other side, the transformer output voltage is fed back to the balancing controller through the feedback diode D3, the first feedback resistor R5 and the second feedback resistor R4; when the primary-side electronic switch tube Q1 is turned on again, the output rectifier diode D2 is reverse biased, the primary coil stores energy, the secondary coil has no current, and the energy required by the load is provided by the output capacitor C2, and this cycle is repeated. During the switching process, the balancing controller detects the current and output voltage through the balancing current detection resistor R2, the feedback diode D3, the first feedback resistor R5 and the second feedback resistor R4, and adjusts the duty cycle of the PWM signal driven by the primary-side electronic switch tube Q1 according to the above values, thereby adjusting the voltage and current at the output end.

[0116] For the low voltage battery pack in the two target balanced battery packs, the primary side electronic switch tube Q1 of the low voltage battery pack in the two target balanced battery packs is turned off, that is, the switch power supply circuit part of the low voltage battery pack in the two target balanced battery packs does not work, and the control voltage is output through the positive switch control terminal and the negative switch control terminal of the balancing controller corresponding to the low voltage battery pack in the two target balanced battery packs, so that the first positive end electronic switch tube Q2, the second positive end electronic switch tube Q3, the first negative end electronic switch tube Q4 and the second negative end electronic switch tube Q5 of the low voltage battery pack in the two target balanced battery packs are turned on. At this time, the total positive electrode of the battery cell is connected to the positive end of the secondary output coil of the high voltage battery pack in the two target balanced battery packs through the balancing positive line, and the total negative electrode of the battery cell is connected to the negative end of the secondary output coil of the high voltage battery pack in the two target balanced battery packs through the balancing negative line; at this time, since the output voltage of the high voltage battery pack in the two target balanced battery packs is greater than that of the low voltage battery pack in the two target balanced battery packs, the electric energy is transferred from the high voltage battery pack in the two target balanced battery packs to the low voltage battery pack in the two target balanced battery packs. For other non-target cell modules in the battery system, the above-mentioned switch MOS tubes are kept in a closed state, so that only two target cell modules to be balanced form a conductive loop on the balancing loop.

[0117] In one embodiment, see Fig. 9 , the balancing subcircuit also includes a clamping resistor R1 and a clamping capacitor C1, the positive electrode P+ of the battery module is respectively connected to the first end of the clamping resistor R1 and the first end of the clamping capacitor C1, and the second end of the clamping resistor R1 and the second end of the clamping capacitor C1 are both connected to the first end of the primary side electronic switch tube Q1. In this embodiment, the clamping resistor R1 and the clamping capacitor C1 are simultaneously connected in parallel on the primary side of the balancing transformer T1, and the clamping resistor R1 and the clamping capacitor C1 are connected in parallel to each other to form a clamping circuit on the primary side of the balancing transformer T1 to absorb the leakage inductance of the primary side of the balancing transformer T1, so as to reduce the peak voltage across the drain and source of the primary side electronic switch tube Q1 during the switching process, thereby effectively protecting the primary side electronic switch tube Q1 and ensuring the normal operation of the primary side electronic switch tube Q1. The balancing subcircuit further includes a clamping diode D1, the first end of the primary-side electronic switch tube Q1 is connected to the positive electrode of the clamping diode D1, and the negative electrode of the clamping diode D1 is connected to the second end of the clamping resistor R1. In this embodiment, the clamping diode D1 is connected in series between the first end of the primary side of the balancing transformer T1 and the clamping capacitor C1, so that the clamping resistor R1, the clamping capacitor C1 and the clamping diode D1 form an RCD clamping circuit, which further effectively protects the primary-side electronic switch tube Q1.

[0118] In one of the embodiments, the present disclosure also relates to a battery cell module series-parallel balancing system, including the multi-battery cell module balancing circuit described in any of the above embodiments. In this embodiment, the multi-battery cell module balancing circuit includes multiple balancing sub-circuits; each of the balancing sub-circuits includes a battery cell module, a balancing transformer, a primary-side electronic switch tube, a balancing positive-end switch, a balancing negative-end switch, an output rectifier diode, and an output capacitor, wherein the multiple battery cell modules are connected in series and / or in parallel with each other; the positive electrode of the battery cell module is connected to the second end of the primary side of the balancing transformer, the first end of the primary side of the balancing transformer is connected to the first end of the primary-side electronic switch tube, the second end of the primary-side electronic switch tube is connected to the negative electrode of the battery cell module, and the control end of the primary-side electronic switch tube is used to be connected to the first PWM control end of the balancing controller; the first end of the secondary side of the balancing transformer is connected to the positive electrode of the output rectifier diode, and the negative electrode of the output rectifier diode is connected to the negative electrode of the output rectifier diode. The first end of the output capacitor is connected, and the first end of the output capacitor is also connected to the first end of the output capacitor of other balancing sub-circuits, the second end of the output capacitor is connected to the second end of the secondary side of the balancing transformer, and the second end of the output capacitor is also connected to the second end of the output capacitor of other balancing sub-circuits; the positive electrode of the battery cell module is also connected to the first end of the balancing positive end switch, and the second end of the balancing positive end switch is connected to the first end of the output capacitor, and the control end of the balancing positive end switch is used to be connected to the positive end switch control end of the balancing controller; the negative electrode of the battery cell module is also connected to the first end of the balancing negative end switch, and the second end of the balancing negative end switch is connected to the second end of the output capacitor, and the control end of the balancing negative end switch is used to be connected to the negative end switch control end of the balancing controller. During balancing, the balancing positive switch and the balancing negative switch corresponding to the high-voltage battery pack in the two target balancing battery packs are closed, and the balancing positive switch and the balancing negative switch corresponding to the low-voltage battery pack in the two target balancing battery packs are turned on. By controlling the on-off of the primary-side electronic switch tube corresponding to the high-voltage battery pack in the two target balancing battery packs, the electric energy on the high-voltage battery pack in the two target balancing battery packs is stored in the corresponding output capacitor. After that, the low-voltage battery pack in the two target balancing battery packs receives the electric energy of the output capacitor corresponding to the high-voltage battery pack in the two target balancing battery packs through its own corresponding balancing positive switch and balancing negative switch. Moreover, since the balancing circuit is separated from the external charging and discharging circuit of the cell module, the mutually balanced cell modules can be balanced regardless of whether they are in a static state or a charging and discharging state, which has the advantages of high balancing efficiency and good flexibility. In addition, the balancing circuits of the two target balancing cell modules are connected through a transformer. Due to the isolation effect of the transformer, the selection of the two target cell modules is not affected by the position of the cell modules in the battery system, and the balancing between any two cell modules is achieved.

[0119] Those of ordinary skill 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 memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. 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).

[0120] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A battery pack system balancing monitoring method, characterized in that: include: Obtain the battery pack balancing state parameters of the battery pack group; Performing a balance adjustment process on the battery pack balance state parameter and the preset balance state parameter to obtain a battery pack balance adjustment value; According to the battery pack balancing adjustment amount, a balancing on / off control signal is sent to the main control pack balancing central controller to adjust the on / off of the balancing circuit of the battery pack to be balanced.

2. The battery pack system balancing monitoring method according to claim 1, characterized in that: The obtaining of the battery pack balancing state parameters of the battery pack group includes: Obtain the maximum battery pack voltage difference of the battery pack group.

3. The battery pack system balancing monitoring method according to claim 2, characterized in that: The step of performing a balancing adjustment process on the battery pack balancing state parameter and the preset balancing state parameter to obtain a battery pack balancing adjustment value includes: The difference between the maximum pressure difference of the battery pack and the preset maximum pressure difference is calculated to obtain the maximum pressure difference difference of the battery pack.

4. The battery pack system balancing monitoring method according to claim 3, characterized in that: The step of sending a balancing on / off control signal to a main control pack balancing central controller according to the balancing adjustment amount of the battery pack to adjust the on / off of the balancing circuit of the battery pack to be balanced includes: Detecting whether the maximum balanced pressure difference of the battery pack is greater than or equal to a preset balanced pressure difference; When the maximum balanced pressure difference of the battery pack is greater than or equal to the preset balanced pressure difference, a balanced start signal is sent to the main control pack balanced central controller.

5. The battery pack system balancing monitoring method according to claim 1, characterized in that: The obtaining of the battery pack balancing state parameters of the battery pack group includes: Obtain a maximum value of a battery pack current difference of the battery pack group.

6. The battery pack system balancing monitoring method according to claim 5, characterized in that: The step of performing a balancing adjustment process on the battery pack balancing state parameter and the preset balancing state parameter to obtain a battery pack balancing adjustment value includes: The difference between the maximum flow difference of the battery pack and the preset maximum flow difference is calculated to obtain the maximum flow difference difference of the battery pack balance.

7. The battery pack system balancing monitoring method according to claim 6, characterized in that: The step of sending a balancing on / off control signal to a main control pack balancing central controller according to the balancing adjustment amount of the battery pack to adjust the on / off of the balancing circuit of the battery pack to be balanced includes: Detecting whether the maximum current difference adjustment of the battery pack balance is less than a preset current difference adjustment; When the maximum current difference adjustment of the battery pack balance is less than the preset current difference adjustment, a balance shutdown signal is sent to the main control pack balance central controller.

8. A battery pack system balancing monitoring device, characterized in that: include: A balancing acquisition module, the balancing acquisition module is used to obtain battery pack balancing state parameters of the battery pack group; A balancing conversion module, the balancing conversion module is used to perform a balancing adjustment process on the balancing state parameter of the battery pack and a preset balancing state parameter to obtain a balancing adjustment amount of the battery pack; A balancing control module is used to send a balancing on / off control signal to the main control pack balancing central controller according to the balancing adjustment amount of the battery pack to adjust the on / off of the balancing circuit of the battery pack to be balanced.

9. A computer 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 7 are implemented.

10. 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 7 are implemented.

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