Battery equalization control method and device, electronic equipment and storage medium

Abstract

The invention provides a battery equalization control method and device, electronic equipment and a storage medium, and is applied to a control chip in a battery equalization circuit, the battery equalization circuit further comprises a plurality of equalization thermistors with heating devices underlaid and equalization MOS tubes correspondingly connected with the equalization thermistors, and when a module cell is charged to a preset first voltage threshold value, the equalization thermistors are electrically connected with the equalization MOS tubes. Acquiring a cell voltage corresponding to each string of cells in the module, and determining a voltage difference value between a maximum value and a minimum value corresponding to the cell voltage; when the voltage difference value is greater than a preset first voltage difference threshold value, controlling the equalization MOS tube to be opened, and performing equalization discharging on the battery cell string with the battery cell voltage greater than a preset second voltage threshold value; and controlling a heating device which is connected with the target battery cell string with the maximum battery cell voltage and is padded below the equalization thermistor to work so as to reduce the resistance value of the equalization thermistor and increase the equalization discharge current corresponding to the target battery cell string. The current distribution of the single batteries can be dynamically adjusted by using the adjustable resistor, and efficient equalization is realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage control, and in particular, to a battery balancing control method, device, electronic device, and storage medium. Background Art

[0002] With the wide application of electric vehicles, energy storage systems, and other battery-powered devices, the balanced management of battery packs has become a key factor affecting the overall system performance and lifespan. In a series-connected battery pack, due to differences in production processes, aging degrees, working environments, etc. among individual battery cells, the voltages and capacities of the individual battery cells will gradually deviate, resulting in overcharging or over-discharging of some individual battery cells, thereby affecting the lifespan and safety of the entire battery pack.

[0003] The magnitude of the balancing current is an important indicator for eliminating cell differences during the aging of lithium battery modules. The magnitude of the balancing current directly affects the performance consistency during the aging process of the module cells. If the battery is not balanced properly, it will cause a large voltage difference at the end of charge and discharge during customer use, affecting the service life of the module. The resistance in the balancing circuit directly affects the magnitude of the current in the balancing circuit, indirectly affecting the balancing time and the compatibility with the cell performance.

[0004] Existing battery balancing methods mainly include two categories: passive balancing and active balancing. Passive balancing usually uses a fixed resistor for energy dissipation to reduce the voltage of high-voltage monomers, but this method has problems such as large energy loss and low balancing efficiency. Active balancing methods use energy storage components such as inductors, transformers, or capacitors to transfer energy between individual battery cells to improve the balancing efficiency. However, their circuits are complex, the cost is high, and there are additional power conversion losses. Summary of the Invention

[0005] Embodiments of the present disclosure at least provide a battery balancing control method, device, electronic device, and storage medium, which can dynamically adjust the current distribution of individual batteries using an adjustable resistor to achieve efficient balancing, while reducing energy loss, improving battery balancing efficiency, and system reliability.

[0006] Embodiments of the present disclosure provide a battery balancing control method, which is applied to a control chip in a battery balancing circuit. The battery balancing circuit further includes a plurality of balancing thermistors with heating devices underneath, and a balancing MOS transistor corresponding to each of the balancing thermistors. The method includes:

[0007] When the module cells are charged to a preset first voltage threshold, collect the cell voltages corresponding to each string of cells in the module, and determine the voltage difference between the maximum value and the minimum value of the cell voltages;

[0008] When the voltage difference is greater than a preset first voltage difference threshold, control the balancing MOS transistor to turn on, and perform balancing discharge on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold;

[0009] Control the heating device connected to the balancing thermistor pad of the target battery cell string with the maximum battery cell voltage to work, so as to reduce the resistance value of the balancing thermistor and increase the balancing discharge current corresponding to the target battery cell string;

[0010] Monitor the voltage difference in real time. When the voltage difference is not greater than a preset second voltage difference threshold, control the working power of the heating device corresponding to the target battery cell string to decrease, so as to increase the resistance value of the balancing thermistor and reduce the balancing discharge current corresponding to the target battery cell string.

[0011] In an optional implementation manner, the battery balancing circuit further includes a heater total controller and a heater sub-controller;

[0012] One end of the heater total controller is communicatively connected to each heater sub-controller;

[0013] The other end of the heater total controller is connected to the control chip;

[0014] Each heater sub-controller is connected to the corresponding heating device.

[0015] In an optional implementation manner, controlling the heating device connected to the balancing thermistor pad of the target battery cell string with the maximum battery cell voltage to work specifically includes:

[0016] Receive the heating trigger signal sent by the BMS, and forward the heating trigger signal carrying the identity identifier corresponding to the target battery cell string to the heater total controller;

[0017] Through the heater total controller, send the heating trigger signal to the heater sub-controller connected to the heating device corresponding to the target battery cell string according to the identity identifier;

[0018] After receiving the heating trigger signal, the heater sub-controller triggers the connected heating device to work.

[0019] In an optional implementation manner, the battery balancing circuit further includes a MOS switch total controller;

[0020] One end of the MOS switch total controller is communicatively connected to the control chip;

[0021] The other end of the MOS switch total controller is respectively communicatively connected to each balancing MOS transistor.

[0022] In an alternative embodiment, controlling the balancing MOS transistor to turn on specifically includes:

[0023] Receiving a balancing discharge trigger signal sent by the BMS, parsing the balancing discharge trigger signal, determining the battery cell string with the battery cell voltage greater than a preset second voltage threshold, and sending the balancing discharge trigger signal to the MOS switch master controller while carrying the identity identifier corresponding to the battery cell string;

[0024] After receiving the balancing discharge trigger signal, the MOS switch master controller controls the corresponding balancing MOS transistor connected to the battery cell string with the battery cell voltage greater than the preset second voltage threshold to turn on according to the identity identifier.

[0025] In an alternative embodiment, after controlling the operating power of the heating device corresponding to the target battery cell string to decrease, the method further includes:

[0026] When the voltage difference is not greater than a preset third voltage difference threshold, sending a MOS switch off signal to the MOS switch master controller, where the preset first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold;

[0027] After receiving the MOS switch off signal, the MOS switch master controller triggers the corresponding balancing MOS transistor to turn off.

[0028] In an alternative embodiment, after controlling the heating device connected to the balancing thermistor underlay corresponding to the target battery cell string with the maximum battery cell voltage to operate, the method further includes:

[0029] Increasing the charging current corresponding to the module battery cells.

[0030] The embodiments of the present disclosure further provide a battery balancing control device, which is applied to a control chip in a battery balancing circuit. The battery balancing circuit further includes a plurality of balancing thermistors with heating devices underlaid and a balancing MOS transistor corresponding to each balancing thermistor. The device includes:

[0031] A voltage acquisition module, configured to collect the battery cell voltage corresponding to each string of battery cells in the module and determine the voltage difference between the maximum value and the minimum value of the battery cell voltage when the module battery cells are charged to a preset first voltage threshold;

[0032] A balancing discharge module, configured to control the balancing MOS transistor to turn on and perform balancing discharge for the battery cell string with the battery cell voltage greater than a preset second voltage threshold when the voltage difference is greater than a preset first voltage difference threshold;

[0033] An accelerating discharge module is configured to control the heating device connected to the equalizing thermistor underpad of the target cell string having the maximum cell voltage to operate, so as to reduce the resistance value of the equalizing thermistor and increase the equalizing discharge current corresponding to the target cell string;

[0034] A discharge decelerating module is configured to monitor the voltage difference in real time. When the voltage difference is not greater than a preset second voltage difference threshold, it controls the operating power of the heating device corresponding to the target cell string to decrease, so as to increase the resistance value of the equalizing thermistor and reduce the equalizing discharge current corresponding to the target cell string.

[0035] An embodiment of the present disclosure further provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device runs, the processor communicates with the memory through the bus. When the machine-readable instructions are executed by the processor, the above battery equalization control method, or the steps in any possible implementation manner of the above battery equalization control method are executed.

[0036] An embodiment of the present disclosure further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the above battery equalization control method, or the steps in any possible implementation manner of the above battery equalization control method are executed.

[0037] An embodiment of the present disclosure further provides a computer program product, including a computer program / instructions. When the computer program and instructions are executed by a processor, the above battery equalization control method, or the steps in any possible implementation manner of the above battery equalization control method are implemented.

[0038] A battery equalization control method, device, electronic device and storage medium provided by an embodiment of the present disclosure are applied to a control chip in a battery equalization circuit. The battery equalization circuit further includes a plurality of equalization thermistors with heating devices underlaid, and an equalization MOS transistor corresponding to each equalization thermistor. When the module battery cells are charged to a preset first voltage threshold, the battery cell voltages corresponding to each string of battery cells in the module are collected, and the voltage difference between the maximum value and the minimum value of the battery cell voltages is determined; when the voltage difference is greater than a preset first voltage difference threshold, the equalization MOS transistor is controlled to turn on, and equalization discharge is performed on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold; the heating device underlaid the equalization thermistor connected to the target battery cell string with the maximum battery cell voltage is controlled to operate, so as to reduce the resistance value of the equalization thermistor and increase the equalization discharge current corresponding to the target battery cell string; the voltage difference is monitored in real time, and when the voltage difference is not greater than a preset second voltage difference threshold, the operating power of the heating device corresponding to the target battery cell string is controlled to decrease, so as to increase the resistance value of the equalization thermistor and decrease the equalization discharge current corresponding to the target battery cell string. It is possible to dynamically adjust the current distribution of individual battery cells by using an adjustable resistor, achieve efficient equalization, improve the battery equalization efficiency and system reliability while reducing energy loss.

[0039] In order to make the above objects, features and advantages of the present disclosure more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, gives a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings required for use in the embodiments will be briefly introduced below. The accompanying drawings herein are incorporated into the specification and constitute a part of this specification. These drawings illustrate embodiments consistent with the present disclosure and, together with the specification, are used to explain the technical solutions of the present disclosure. It should be understood that the following drawings only illustrate some embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 FIG. shows a schematic diagram of a battery equalization circuit provided by an embodiment of the present disclosure;

[0042] Figure 2 FIG. shows a flowchart of a battery equalization control method provided by an embodiment of the present disclosure;

[0043] Figure 3 FIG. shows a schematic diagram of a battery equalization control device provided by an embodiment of the present disclosure;

[0044] Figure 4The figure shows a schematic diagram of an electronic device provided by an embodiment of the present disclosure. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only some of the embodiments of the present disclosure, rather than all of the embodiments. Components of the embodiments of the present disclosure described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the claimed present disclosure, but merely represents selected embodiments of the present disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0046] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] The term "and / or" in this document merely describes an association relationship and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" in this document means any one of multiple items or any combination of at least two of multiple items. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set composed of A, B, and C.

[0048] Through research, it is found that the magnitude of the balancing current is an important indicator for eliminating cell differences during the aging of a lithium battery module. The magnitude of the balancing current directly affects the performance consistency problem during the aging process of the module cells. If the battery is not balanced properly, it will cause a large voltage difference at the end of charge and discharge during customer use, affecting the service life of the module. The resistance in the balancing circuit directly affects the magnitude of the current in the balancing circuit, indirectly affecting the balancing time and the compatibility with the cell performance. Existing battery balancing methods mainly include two categories: passive balancing and active balancing. Passive balancing usually uses a fixed resistor for energy dissipation to reduce the voltage of high-voltage monomers, but this method has problems such as large energy loss and low balancing efficiency. Active balancing methods use energy storage components such as inductors, transformers, or capacitors to transfer energy between cell monomers to improve the balancing efficiency. However, their circuits are complex, the cost is high, and there are additional power conversion losses.

[0049] Based on the above research, the present disclosure provides a battery equalization control method, device, electronic device, and storage medium, which are applied to a control chip in a battery equalization circuit. The battery equalization circuit further includes a plurality of equalization thermistors with heating devices underneath and an equalization MOS transistor corresponding to each equalization thermistor. When the module battery cells are charged to a preset first voltage threshold, the battery cell voltages corresponding to each string of battery cells in the module are collected, and the voltage difference between the maximum value and the minimum value of the battery cell voltages is determined. When the voltage difference is greater than a preset first pressure difference threshold, the equalization MOS transistor is controlled to turn on, and equalization discharge is performed on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold. The heating device under the equalization thermistor connected to the target battery cell string with the maximum battery cell voltage is controlled to operate, so as to reduce the resistance value of the equalization thermistor and increase the equalization discharge current corresponding to the target battery cell string. The voltage difference is monitored in real time. When the voltage difference is not greater than a preset second pressure difference threshold, the operating power of the heating device corresponding to the target battery cell string is controlled to decrease, so as to increase the resistance value of the equalization thermistor and decrease the equalization discharge current corresponding to the target battery cell string. The current distribution of individual battery cells can be dynamically adjusted by using an adjustable resistor to achieve efficient equalization, while reducing energy loss and improving battery equalization efficiency and system reliability.

[0050] For ease of understanding of this embodiment, first, a battery equalization circuit disclosed in the embodiments of the present disclosure will be introduced in detail. Refer to Figure 1 As shown, it is a schematic diagram of a battery equalization circuit provided by an embodiment of the present disclosure.

[0051] As Figure 1 shown in, the battery equalization circuit provided by the embodiments of the present disclosure includes a control chip, an equalization thermistor, an equalization MOS transistor, a heater master controller, a heater slave controller, and a MOS switch master controller.

[0052] Specifically, a heating device is placed under each equalization thermistor, each equalization thermistor is connected to an equalization MOS transistor, one end of the heater master controller is communicatively connected to each heater slave controller, the other end of the heater master controller is connected to the control chip, and each heater slave controller is connected to the corresponding heating device. One end of the MOS switch master controller is communicatively connected to the control chip; the other end of the MOS switch master controller is communicatively connected to each equalization MOS transistor respectively.

[0053] It should be noted that the resistance value of the equalization thermistor decreases with the increase of temperature, and each equalization thermistor is connected to a string of battery cells.

[0054] Secondly, the battery equalization control method provided by the embodiments of the present disclosure will be introduced. The execution subject of the battery equalization control method provided by the embodiments of the present disclosure is asFigure 1 The control chip in the battery equalization circuit shown in Figure 1 can be integrated into a computer device with certain computing capabilities. Such computer devices include, for example: terminal devices, servers, or other processing devices. Terminal devices can be user equipment (UE), mobile devices, user terminals, terminals, cellular phones, cordless phones, personal digital assistants (PDA), handheld devices, computing devices, in-vehicle devices, wearable devices, etc. In some possible implementation manners, the control chip can be implemented by the processor calling computer-readable instructions stored in the memory.

[0055] See Figure 2 As shown in Figure 2 , it is a flowchart of a battery equalization control method provided by an embodiment of the present disclosure. The method includes steps S101 to S104, where:

[0056] S101. When the module battery cells are charged to a preset first voltage threshold, collect the battery cell voltages corresponding to each string of battery cells in the module, and determine the voltage difference between the maximum value and the minimum value of the battery cell voltages.

[0057] In a specific implementation, first, after the aging starts, the lithium battery module is charged until the voltage of the single battery cell in the module is charged to the preset first voltage threshold. Then, control the equalization MOS transistor to turn on. At this time, collect the battery cell voltages of each string of battery cells in the lithium battery module and send them to the BMS (Battery Management System). In the case of the end of charging, the voltage difference of the single cells will be relatively obvious.

[0058] Here, when the module battery cells are charged to the preset first voltage threshold, the system starts to execute the first step of equalization control, that is, collect the battery cell voltages and calculate the voltage difference. During the charging process of the battery module, when it is detected that the battery cell voltage reaches the preset first voltage threshold, the system starts the battery cell voltage collection and equalization judgment process.

[0059] It should be noted that the preset first voltage threshold can be set according to actual needs and is not specifically limited here.

[0060] Among them, the control chip can measure the voltage of each string of battery cells in the module through an internal or external voltage acquisition module (such as an ADC, analog-to-digital converter). The sampled data can be transmitted to the control chip through a single-wire bus (such as I 2 2C, SPI, or CAN bus) to ensure efficient and accurate data acquisition.

[0061] Further, after the voltages of all the battery cell strings are collected, the control chip analyzes these voltage data to determine the maximum voltage value and the minimum voltage value, calculates the difference between the maximum and minimum battery cell voltages, and this voltage difference is used to determine whether equalizing discharge is required. If the difference is greater than a preset first voltage difference threshold, the system will perform equalizing discharge.

[0062] Optionally, the control chip can store the current voltage data for subsequent equalizing control or trend analysis, or send the voltage data to the BMS.

[0063] In this way, the system can accurately obtain the voltage states of each battery cell and determine whether equalizing operation is required, thereby improving the consistency and lifespan of the battery module.

[0064] S102. When the voltage difference is greater than a preset first voltage difference threshold, control the equalizing MOS transistor to turn on, and perform equalizing discharge on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold.

[0065] In a specific implementation, when the difference between the maximum voltage and the minimum voltage inside the battery module exceeds the preset first voltage difference threshold, the system needs to perform equalizing discharge to reduce the voltage deviation between different battery cells and improve the consistency of the module.

[0066] Here, it is determined whether the calculated battery cell voltage difference is greater than the preset first voltage difference threshold. If the voltage difference is greater than the preset first voltage difference threshold, equalizing discharge is triggered; otherwise, the status quo is maintained and no equalizing operation is performed.

[0067] It should be noted that the preset first voltage difference threshold and the preset second voltage threshold can be set according to actual needs and are not specifically limited here.

[0068] At the same time, equalizing discharge is only performed on those battery cell strings whose battery cell voltages are higher than the preset second voltage threshold to ensure that the low-voltage battery cells will not be further discharged due to equalization.

[0069] As a possible implementation manner, receive the equalizing discharge trigger signal sent by the BMS, parse the equalizing discharge trigger signal, determine the battery cell strings whose battery cell voltages are greater than the preset second voltage threshold, and send the equalizing discharge trigger signal to the MOS switch master controller together with the identity identifier corresponding to the battery cell string; after receiving the equalizing discharge trigger signal, the MOS switch master controller controls the equalizing MOS transistors connected to the battery cell strings whose battery cell voltages are greater than the preset second voltage threshold to turn on according to the identity identifier.

[0070] In a specific implementation, the BMS periodically detects the cell voltage collected by the control chip. When the equalization condition is met, after receiving the equalization discharge trigger signal from the BMS, the MOS switch total controller analyzes the signal content, determines the target cell string number that needs to perform discharge equalization, and controls the equalization MOSFET to turn on through communication protocol (such as I 2 C, SPI or CAN) instructions, conducts the equalization loop of the target cell string, and confirms the actual conduction state of the MOSFET through the signal feedback mechanism to ensure the successful execution of the instruction.

[0071] Here, after the equalization MOSFET is turned on, the excess energy of the cell string is released through the equalization thermistor. The current path can be target cell → equalization MOSFET → equalization thermistor → ground (GND). The characteristic of the equalization thermistor can be that the initial resistance is relatively high, and its resistance can be reduced by controlling the heating device under it, increasing the discharge current, and improving the equalization efficiency.

[0072] S103. Control the heating device under the equalization thermistor connected to the target cell string with the maximum cell voltage to work, so as to reduce the resistance of the equalization thermistor and increase the equalization discharge current corresponding to the target cell string.

[0073] In a specific implementation, during the equalization discharge process, in order to accelerate the equalization speed of the high-voltage cell string, a variable resistance equalization strategy is adopted. Among them, the resistance of the equalization thermistor is affected by temperature changes. When a larger equalization discharge current is required, the system will control the heating device to heat the equalization thermistor, reduce its resistance, thereby increasing the discharge current and accelerating the equalization discharge process. And then increase the charging current corresponding to the module cells.

[0074] Here, when it is detected that the voltage of a certain cell string is significantly higher than that of other cell strings, at this time, control the heating device under the equalization resistor connected to this cell string to work, heat the equalization resistor. At this time, the equalization resistor connected to this cell string will have its resistance decreased due to heating. From I = U / R, it can be known that when the resistance becomes smaller, the current will increase, which makes the equalization discharge current of this cell string higher than that of other strings. At this time, due to the fact that the equalization discharge current of this cell string is larger than that of other cell strings, the voltage of this cell string will drop faster.

[0075] Among them, during the equalization discharge process, when the system detects that the cell voltage of a certain cell string is the maximum and the voltage difference exceeds the set threshold, start the heating adjustment mechanism. Determine the cell string corresponding to the maximum cell voltage, that is, the target equalization discharge cell string.

[0076] As a possible implementation, receive the heating trigger signal sent by the BMS, and forward the heating trigger signal carrying the identity identifier corresponding to the target battery cell string to the heater master controller; the heater master controller sends the heating trigger signal to the heater slave controller connected to the heating device corresponding to the target battery cell string according to the identity identifier; after receiving the heating trigger signal, the heater slave controller triggers the connected heating device to work.

[0077] In a specific implementation, when the system determines the target battery cell string, the BMS issues an instruction to control the heater slave controller to turn on the heating device below the target battery cell string. During this process, the BMS determines the target battery cell string number, sends a heating signal to the heater master controller, and requests the heating device to be turned on. The heater master controller analyzes the signal, finds the corresponding heater slave controller, and the heater slave controller is powered on for heating to increase the temperature of the equalization thermistor connected to the target battery cell string.

[0078] Here, the equalization thermistor has a negative temperature coefficient characteristic, that is, when the temperature rises, the resistance value decreases. When the heating device is turned on, the temperature of the equalization thermistor rises, resulting in a decrease in its resistance value. Due to the decrease in the resistance value of the thermistor, the current in the equalization circuit of the target battery cell string increases, and the discharge path is the target battery cell string → equalization MOS transistor → thermistor → GND.

[0079] Among them, the discharge rate is affected by factors such as the heating power, the material characteristics of the thermistor, and the heat dissipation design.

[0080] S104. Real-time monitor the voltage difference. When the voltage difference is not greater than the preset second voltage difference threshold, control the working power of the heating device corresponding to the target battery cell string to decrease, so as to increase the resistance value of the equalization thermistor and decrease the equalization discharge current corresponding to the target battery cell string.

[0081] In a specific implementation, during the equalization discharge process, the system precisely controls the equalization discharge current by dynamically adjusting the power of the heating device to ensure that the equalization process is both efficient and safe. After the equalization discharge of the target battery cell string has been carried out for a period of time, the system real-time monitors the voltages of all battery cells and calculates the voltage difference between the battery cells. If the voltage difference gradually decreases and drops to the preset second voltage difference threshold, the system adjusts the power of the heating device to reduce the heating degree, so as to decrease the equalization discharge current and reduce the equalization time.

[0082] Here, when the voltage of the battery cell string with the highest voltage drops, when the BMS obtains that the voltage difference decreases, it will command the heater under the equalization resistor connected to this string of battery cells to reduce the power. At this time, the equalization resistor will become larger, reducing the equalization discharge current of this string of battery cells. At the same time, due to the decrease in the voltage of the highest string of battery cells, the entire equalization process can perform charging with a larger current, thereby achieving the purpose of reducing the equalization time.

[0083] Among them, after the above conditions are met, gradually reduce the power of the heating device connected to the target battery cell string to gradually lower its temperature, thereby increasing the resistance value of the balancing thermistor and reducing the balancing discharge current.

[0084] As a possible implementation, when the voltage difference is not greater than a preset third voltage difference threshold, send a MOS switch off signal to the MOS switch total controller, where the preset first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold; after receiving the MOS switch off signal, the MOS switch total controller triggers the corresponding balancing MOS transistor to turn off.

[0085] As another possible implementation, when the voltage difference is not greater than a preset third voltage difference threshold, send a MOS switch off signal to the MOS switch total controller, where the preset first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold; after receiving the MOS switch off signal, the MOS switch total controller triggers the corresponding balancing MOS transistor to turn off.

[0086] Here, during the entire balancing process, the BMS collects the voltage data of each battery cell string in real time, and based on the voltage level of the battery cells, issues the power to be used to the heater and detects the temperature and resistance value of the resistor, so as to achieve the purpose that the balancing discharge current in the balancing circuit of each battery cell string can be adjusted according to the size of the battery cell voltage.

[0087] It should be noted that the preset first voltage difference threshold, second voltage difference threshold, and third voltage difference threshold can be selected according to actual needs and are not specifically limited here.

[0088] A battery balancing control method provided by an embodiment of the present disclosure is applied to a control chip in a battery balancing circuit. The battery balancing circuit further includes a plurality of balancing thermistors with heating devices disposed thereunder and a balancing MOS transistor corresponding to each of the balancing thermistors. When the module battery cells are charged to a preset first voltage threshold, the battery cell voltages corresponding to each string of battery cells in the module are collected, and the voltage difference between the maximum value and the minimum value of the corresponding battery cell voltages is determined. When the voltage difference is greater than a preset first pressure difference threshold, the balancing MOS transistor is controlled to turn on, and balancing discharge is performed on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold. The heating device disposed under the balancing thermistor connected to the target battery cell string with the maximum battery cell voltage is controlled to operate, so as to reduce the resistance value of the balancing thermistor and increase the balancing discharge current corresponding to the target battery cell string. The voltage difference is monitored in real time. When the voltage difference is not greater than a preset second pressure difference threshold, the operating power of the heating device corresponding to the target battery cell string is controlled to decrease, so as to increase the resistance value of the balancing thermistor and decrease the balancing discharge current corresponding to the target battery cell string. It is possible to dynamically adjust the current distribution of individual battery cells by using an adjustable resistor, achieve efficient balancing, improve the battery balancing efficiency and system reliability while reducing energy loss.

[0089] Those skilled in the art can understand that in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0090] Based on the same inventive concept, an embodiment of the present disclosure further provides a battery balancing control device corresponding to the battery balancing control method. Since the principle of solving problems by the device in the embodiment of the present disclosure is similar to that of the above battery balancing control method in the embodiment of the present disclosure, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0091] Please refer to Figure 3 , Figure 3 which is a schematic diagram of a battery balancing control device provided by an embodiment of the present disclosure. As Figure 3 shown in Figure 1 ,the battery balancing control device 300 provided by an embodiment of the present disclosure is applied to a control chip in a battery balancing circuit as shown in

[0092] The voltage acquisition module 310 is configured to collect the battery cell voltages corresponding to each string of battery cells in the module and determine the voltage difference between the maximum value and the minimum value of the corresponding battery cell voltages when the module battery cells are charged to a preset first voltage threshold;

[0093] The balancing discharge module 320 is configured to control the balancing MOS transistor to turn on when the voltage difference is greater than a preset first voltage difference threshold, and perform balancing discharge on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold.

[0094] The accelerating discharge module 330 is configured to control the heating device connected to the balancing thermistor underlay of the target battery cell string having the maximum battery cell voltage to operate, so as to reduce the resistance value of the balancing thermistor and increase the balancing discharge current corresponding to the target battery cell string.

[0095] The discharge decelerating module 340 is configured to monitor the voltage difference in real time, and when the voltage difference is not greater than a preset second voltage difference threshold, control the operating power of the heating device corresponding to the target battery cell string to decrease, so as to increase the resistance value of the balancing thermistor and decrease the balancing discharge current corresponding to the target battery cell string.

[0096] Descriptions of the processing procedures of the various modules in the device and the interaction procedures between the various modules may refer to the relevant descriptions in the foregoing method embodiments, and will not be elaborated here.

[0097] A battery balancing control device provided by an embodiment of the present disclosure is applied to a control chip in a battery balancing circuit. The battery balancing circuit further includes a plurality of balancing thermistors with heating devices underlaid and a balancing MOS transistor corresponding to each balancing thermistor. When the module battery cells are charged to a preset first voltage threshold, the battery cell voltages corresponding to each string of battery cells in the module are collected, and the voltage difference between the maximum value and the minimum value of the corresponding battery cell voltages is determined; when the voltage difference is greater than a preset first voltage difference threshold, control the balancing MOS transistor to turn on, and perform balancing discharge on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold; control the heating device connected to the balancing thermistor underlay of the target battery cell string having the maximum battery cell voltage to operate, so as to reduce the resistance value of the balancing thermistor and increase the balancing discharge current corresponding to the target battery cell string; monitor the voltage difference in real time, and when the voltage difference is not greater than a preset second voltage difference threshold, control the operating power of the heating device corresponding to the target battery cell string to decrease, so as to increase the resistance value of the balancing thermistor and decrease the balancing discharge current corresponding to the target battery cell string. It is possible to dynamically adjust the current distribution of individual battery cells by using adjustable resistors, achieve efficient balancing, and improve the battery balancing efficiency and system reliability while reducing energy loss.

[0098] Corresponding to Figure 2 the battery balancing control method in Figure 4 as shown in

[0099] A processor 41, a memory 42, and a bus 43; the memory 42 is used to store execution instructions, including an internal memory 421 and an external memory 422; here, the internal memory 421 is also called the main memory, which is used to temporarily store the operation data in the processor 41 and the data exchanged with the external memory 422 such as a hard disk. The processor 41 exchanges data with the external memory 422 through the internal memory 421. When the electronic device 400 runs, the processor 41 communicates with the memory 42 through the bus 43, so that the processor 41 executes Figure 2 the steps of the battery balancing control method in

[0100] Embodiments of the present disclosure also provide a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, it executes the steps of the battery balancing control method described in the above method embodiments. Among them, the storage medium may be a volatile or non-volatile computer-readable storage medium.

[0101] Embodiments of the present disclosure also provide a computer program product, which includes computer instructions. When the computer instructions are executed by a processor, they can execute the steps of the battery balancing control method described in the above method embodiments. For details, please refer to the above method embodiments and will not be elaborated here.

[0102] Among them, the above computer program product can be specifically implemented in a manner of hardware, software, or a combination thereof. In an optional embodiment, the computer program product is specifically embodied as a computer storage medium. In another optional embodiment, the computer program product is specifically embodied as a software product, such as a Software Development Kit (SDK), etc.

[0103] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working process of the above-described device can refer to the corresponding process in the foregoing method embodiments and will not be elaborated here. In several embodiments provided by the present disclosure, it should be understood that the disclosed device and method can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces, and the indirect coupling or communication connection of the device or unit may be in an electrical, mechanical or other form.

[0104] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0105] In addition, in each embodiment of the present disclosure, each functional unit may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit.

[0106] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present disclosure, in essence, or the part that contributes to the prior art or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present disclosure. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs that can store program codes.

[0107] Finally, it should be noted that: the above-described embodiments are only specific implementation manners of the present disclosure, used to illustrate the technical solutions of the present disclosure, rather than limiting them. The protection scope of the present disclosure is not limited thereto. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present disclosure can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements for some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should all be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A battery balancing control method, characterized in that: A control chip applied to a battery balancing circuit, wherein the battery balancing circuit further comprises a plurality of balancing thermistors with a heating device underneath and a balancing MOS tube correspondingly connected to each of the balancing thermistors, and the method comprises: When the module battery cells are charged to a preset first voltage threshold, the battery cell voltage corresponding to each string of battery cells in the module is collected, and the voltage difference between the maximum value and the minimum value corresponding to the battery cell voltage is determined; When the voltage difference is greater than a preset first voltage difference threshold, the balancing MOS tube is controlled to be turned on, and a balanced discharge is performed on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold; Controlling the heating device under the balancing thermistor connected to the target battery cell string with the maximum battery cell voltage to work, so as to reduce the resistance value of the balancing thermistor and increase the balancing discharge current corresponding to the target battery cell string; The voltage difference is monitored in real time. When the voltage difference is not greater than a preset second voltage difference threshold, the working power of the heating device corresponding to the target battery string is controlled to be reduced to increase the resistance of the balancing thermistor and reduce the balancing discharge current corresponding to the target battery string.

2. The method according to claim 1, characterized in that The battery balancing circuit also includes a heater master controller and a heater sub-controller; One end of the heater master controller is communicatively connected to each of the heater sub-controllers; The other end of the heater master controller is connected to the control chip; Each of the heater sub-controllers is connected to a corresponding heating device.

3. The method according to claim 2, characterized in that Controlling the heating device under the balancing thermistor connected to the target battery cell string with the maximum battery cell voltage to work specifically includes: Receive a heating trigger signal sent by the BMS, and forward the heating trigger signal carrying an identity identifier corresponding to the target battery string to the heater master controller; The heater master controller sends the heating trigger signal to the heater sub-controller connected to the heating device corresponding to the target battery cell string according to the identity identifier; After receiving the heating trigger signal, the heater sub-controller triggers the connected heating device to operate.

4. The method according to claim 1, characterized in that: The battery balancing circuit also includes a MOS switch master controller; One end of the MOS switch master controller is communicatively connected to the control chip; The other end of the MOS switch master controller is respectively connected to each of the balancing MOS tubes for communication.

5. The method according to claim 4, characterized in that Controlling the balancing MOS tube to turn on specifically includes: Receive a balanced discharge trigger signal sent by the BMS, parse the balanced discharge trigger signal, determine a cell string whose cell voltage is greater than a preset second voltage threshold, and send the balanced discharge trigger signal to the MOS switch master controller with an identity identifier corresponding to the cell string; After receiving the balanced discharge trigger signal, the MOS switch master controller controls the balanced MOS tube connected to the cell string whose cell voltage is greater than a preset second voltage threshold to be turned on according to the identity identifier.

6. The method according to claim 4, characterized in that After controlling the target battery cell string to reduce the operating power of the heating device, the method further includes: When the voltage difference value is not greater than a preset third voltage difference threshold, a MOS switch closing signal is sent to the MOS switch master controller, wherein the preset first voltage difference threshold is greater than the second voltage difference threshold, and the second voltage difference threshold is greater than the third voltage difference threshold; After receiving the MOS switch closing signal, the MOS switch master controller triggers the corresponding balancing MOS tube to close.

7. The method according to claim 1, characterized in that After controlling the heating device connected to the target battery cell string having the maximum battery cell voltage and under the balancing thermistor to operate, the method further includes: Increase the charging current corresponding to the module battery cell.

8. A battery balancing control device, characterized in that: A control chip used in a battery balancing circuit, wherein the battery balancing circuit further comprises a plurality of balancing thermistors with a heating device underneath and a balancing MOS tube correspondingly connected to each of the balancing thermistors, and the device comprises: A voltage acquisition module is used to collect the cell voltage corresponding to each string of cells in the module when the module cell is charged to a preset first voltage threshold, and determine the voltage difference between the maximum value and the minimum value corresponding to the cell voltage; A balanced discharge module, used for controlling the balanced MOS tube to turn on when the voltage difference is greater than a preset first voltage difference threshold, and performing balanced discharge on the battery cell string whose battery cell voltage is greater than a preset second voltage threshold; An accelerating discharge module, used for controlling the heating device under the balancing thermistor connected to the target battery string with the maximum battery cell voltage to work, so as to reduce the resistance of the balancing thermistor and increase the balancing discharge current corresponding to the target battery string; The discharge deceleration module is used to monitor the voltage difference in real time. When the voltage difference is not greater than a preset second voltage difference threshold, the operating power of the heating device corresponding to the target battery string is controlled to be reduced to increase the resistance of the balancing thermistor and reduce the balancing discharge current corresponding to the target battery string.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the battery balancing control method according to any one of claims 1 to 7 are performed.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the battery balancing control method according to any one of claims 1 to 7 are executed.

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