Battery system equalization circuit, battery system equalization method, electronic device and storage medium

Abstract

The embodiment of the invention discloses a battery system equalization circuit, a battery system equalization method, electronic equipment and a storage medium, after battery cells meeting a first preset condition and battery cells meeting a second preset condition are determined in a battery pack, the battery cells meeting the first preset condition can be passively equalized according to a second switch module, and / or the battery cells meeting the second preset condition can be passively equalized according to the second switch module; and the battery cells meeting the second preset condition are actively balanced according to the first switch module, so that the battery cells can be balanced according to the actual conditions of different battery cells by combining active balancing and passive balancing, and the balancing accuracy of the battery system is improved.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a battery system balancing circuit, a battery system balancing method, an electronic device, and a storage medium. Background Art

[0002] BMS is currently widely used in the battery field, and balancing management is an important part of BMS. Balancing is divided into active balancing and passive balancing. Active balancing is not applicable in the energy storage field because of its complex hardware. The passive balancing principle releases the energy of the battery cell in the form of heat through power resistors to achieve the purpose of balancing.

[0003] At present, the passive balancing solution is to calculate the voltage difference according to the lowest capacity or lowest voltage of the battery cell, and perform passive balancing based on the calculated voltage difference. However, if the battery cell with the lowest voltage or the lowest capacity is regarded as an abnormal battery cell, there may be a situation where the judgment is wrong. For example, the battery cell with the lowest voltage does not need to be passively balanced, but the current passive balancing solution still performs passive balancing on the battery cell. It can be seen that the current battery system balancing solution has the problem of poor accuracy of battery cell balancing. Summary of the invention

[0004] The embodiments of the present application provide a battery system balancing method, an electronic device, and a storage medium, which can improve the accuracy of battery system balancing.

[0005] The embodiment of the present application provides a battery system balancing circuit, including:

[0006] A plurality of battery packs, each of which is provided with a plurality of battery cells;

[0007] A first switch module, one side of the first switch module is connected to the battery cell, and the other side of the first switch module is connected to a balancing circuit;

[0008] A second switch module, the second switch module is connected to the battery pack through a balancing circuit;

[0009] Among them, when the battery cells of the battery pack meet the first preset condition, the battery cells that meet the first preset condition are passively balanced according to the second switch module, and / or; when the battery cells of the battery pack meet the second preset condition, the battery cells that meet the second preset condition are actively balanced according to the first switch module.

[0010] Optionally, in some embodiments of the present application, the first switch module includes a first switch component and a first resistor, wherein one side of the first switch component is connected to the battery cell, the other side of the first switch component is connected to the first resistor, and the first switch component is connected to the balancing circuit through the first resistor.

[0011] Optionally, in some embodiments of the present application, when the battery cells of the battery pack meet a first preset condition, the second switch component is closed, and the battery cells meeting the first preset condition are passively balanced through the balancing circuit.

[0012] Optionally, in some embodiments of the present application, when the battery cells of the battery pack meet a second preset condition, the first switch component is closed, and the battery cells meeting the second preset condition are actively balanced through the balancing circuit.

[0013] Accordingly, an embodiment of the present application provides a battery system balancing method, including:

[0014] At the end of charging and discharging, monitoring the static voltage of each cell in the battery pack;

[0015] Determining, in the battery pack, a battery cell that meets a first preset condition and a battery cell that meets a second preset condition according to a static voltage of each battery cell at a charging terminal and a static voltage of each battery cell at a discharging terminal;

[0016] Passively balancing the battery cells that meet the first preset condition according to the second switch module, and / or;

[0017] Active balancing is performed on the battery cells that meet the second preset condition according to the first switch module.

[0018] Optionally, in some embodiments of the present application, the passive balancing of the battery cells that meet the first preset condition according to the second switch module includes:

[0019] Closing the second switch component of the second switching module to connect the battery cell that meets the first preset condition to the balancing circuit;

[0020] The battery cells meeting the first preset condition are passively balanced through the balancing circuit.

[0021] Optionally, in some embodiments of the present application, the passive balancing of the battery cells that meet the first preset condition by the balancing circuit includes:

[0022] If the battery cells satisfying the first preset condition belong to the same battery group, calculating a first average voltage value corresponding to the battery group where the battery cells satisfying the first preset condition belong; and performing passive balancing on the battery cells satisfying the first preset condition through the balancing circuit according to the first average voltage value;

[0023] If the battery cells meeting the first preset condition belong to different battery packs, the battery cells meeting the first preset condition are passively balanced synchronously through the balancing circuit.

[0024] Optionally, in some embodiments of the present application, actively balancing the cells that meet the second preset condition according to the first switch module includes:

[0025] Closing the first switch component of the first switch module to connect the battery cells that meet the second preset condition to the balancing circuit;

[0026] The battery cells meeting the second preset condition are passively balanced through the balancing circuit.

[0027] Optionally, in some embodiments of the present application, the passive balancing of the battery cells that meet the second preset condition by the balancing circuit includes:

[0028] Obtaining a second average voltage value of the battery pack where the battery cells meeting the second preset condition are located;

[0029] Determining the number of battery cells corresponding to the battery cells that meet the second preset condition;

[0030] According to the number of battery cells and the second average voltage value, the battery cells meeting the second preset condition are passively balanced through the balancing circuit.

[0031] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above battery system balancing methods are implemented.

[0032] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-described battery system balancing methods are implemented.

[0033] An embodiment of the present application provides a battery system balancing circuit, a battery system balancing method, an electronic device and a storage medium. The battery system balancing circuit includes multiple battery packs, each of which is provided with multiple battery cells; a first switch module, one side of the first switch module is connected to the battery cells, and the other side of the first switch module is connected to a balancing circuit; a second switch module, the second switch module is connected to the battery pack through a balancing circuit; wherein, when the battery cells of the battery pack meet a first preset condition, the battery cells meeting the first preset condition are passively balanced according to the second switch module, and / or; when the battery cells of the battery pack meet a second preset condition, the battery cells meeting the second preset condition are actively balanced according to the first switch module. The battery system balancing method includes monitoring the static voltage of each battery cell in the battery pack at the charging end and the discharging end; determining the battery cells that meet the first preset condition and the battery cells that meet the second preset condition in the battery pack according to the static voltage of each battery cell at the charging end and the static voltage of each battery cell at the discharging end; passively balancing the battery cells that meet the first preset condition according to the second switch module, and / or; actively balancing the battery cells that meet the second preset condition according to the first switch module.

[0034] The battery system balancing solution provided in the present application can, after determining the battery cells that meet the first preset condition and the battery cells that meet the second preset condition in the battery pack, passively balance the battery cells that meet the first preset condition according to the second switch module, and / or actively balance the battery cells that meet the second preset condition according to the first switch module. Therefore, by combining active balancing and passive balancing, balancing can be performed according to the actual conditions of different battery cells, thereby improving the accuracy of battery system balancing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 is a structural schematic diagram of a battery system balancing circuit provided in an embodiment of the present application;

[0037] Figure 2 is another structural schematic diagram of a battery system balancing circuit provided in an embodiment of the present application;

[0038] Figure 3 is a flowchart of a battery system balancing method provided in an embodiment of the present application;

[0039] Figure 4It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0041] See also Figure 1 , Figure 1 : is a structural diagram of a battery system balancing circuit provided in an embodiment of the present application. The battery system balancing circuit provided in an embodiment of the present application includes a plurality of battery packs 101, a first switch module 102 and a second switch module 103, wherein each battery pack 101 is provided with a plurality of battery cells 1011; one side of the first switch module 102 is connected to the battery cell, and the other side of the first switch module 102 is connected to the balancing circuit s; the second switch module 103 is connected to the battery pack 101 through the balancing circuit s; wherein, when the battery cell 1011 of the battery pack 101 meets the first preset condition, the battery cell meeting the first preset condition is passively balanced according to the second switch module 103, and / or; when the battery cell 1011 of the battery pack 101 meets the second preset condition, the battery cell meeting the second preset condition is actively balanced according to the first switch module 102.

[0042] For example, when a cell 1011 in the battery pack meets the first preset condition (for example, the voltage is higher than the average voltage), the second switch module 103 will passively balance the cell. Passive balancing converts excess energy of the cell into heat energy through resistance, thereby reducing the voltage of the cell. When the same or another cell 1011 meets the second preset condition (for example, the voltage is lower than the average voltage), the first switch module 102 will actively balance the cell.

[0043] Optionally, in some embodiments of the present application, please refer to Figure 2 The first switch module 102 includes a first switch component 1021 and a first resistor 1022, wherein one side of the first switch component 1021 is connected to the battery cell 1011, and the other side of the first switch component 1021 is connected to the first resistor 1022, and the first switch component 1021 is connected to the balancing loop s through the first resistor.

[0044] The first switch component 1021 can be an electronic switch, such as a MOSFET or other types of semiconductor switches. It is used to control the connection between the battery cell 1011 and the balancing loop s. When active balancing is required, the first switch component 1021 will be closed to allow current to flow. The first resistor 1022 is connected in series with the first switch component 1021. When the first switch component 1021 is closed, the first resistor 1022 forms a circuit with the battery cell 1011 and the balancing loop s. The function of the first resistor 1022 is to generate a voltage drop when current passes through, which helps to control the magnitude of the current and protect the circuit and the battery cell. For example, when the voltage of a battery cell 1011 is lower than the average voltage of the battery pack and active balancing is required, the first switch component 1021 is closed so that the current can flow from the battery cell with a higher voltage to the battery cell with a lower voltage through the first resistor 1022, thereby increasing the voltage of the latter. The BMS monitors the voltage of the battery cell and controls the opening and closing of the first switch component 1021 as needed to achieve active balancing. When the voltage of the battery cell with a lower voltage reaches or exceeds the average voltage, the first switch component 1021 is disconnected to stop energy transfer.

[0045] Please continue reading Figure 2 The second switch module 103 includes a second switch component 1031 and a second resistor 1032, wherein one side of the second switch component 1031 is connected to the balancing loop s, the other side of the second switch component 1031 is connected to one side of the second resistor 1032, and the other side of the second resistor 1032 is connected to the balancing loop s.

[0046] The second switch component 1031 can be an electronic switch, such as a MOSFET or other type of semiconductor switch. Its function is to control the connection between the balancing loop s and the second resistor 1032. When passive balancing is required, this switch will be closed to allow current to flow. The second resistor 1032 is connected in series with the second switch component 1031. When the second switch component 1031 is closed, the second resistor 1032 forms a circuit with the balancing loop s. The function of the second resistor 1032 is to generate a voltage drop when current passes through, which helps to control the magnitude of the current and convert electrical energy into heat energy, thereby reducing the voltage of the battery cell with a higher voltage. When the voltage of a battery cell 1011 is higher than the average voltage of the battery pack and passive balancing is required, the second switch module 103 will be activated. The second switch component 1031 is closed, so that the current can flow from the battery cell with a higher voltage to the balancing loop through the second resistor 1032, thereby reducing the voltage of the battery cell.

[0047] The battery system balancing solution provided in the present application can, after determining the battery cells 1011 that meet the first preset condition and the battery cells 1011 that meet the second preset condition in the battery group 101, perform passive balancing on the battery cells 1011 that meet the first preset condition according to the second switch module 103, and / or perform active balancing on the battery cells 1011 that meet the second preset condition according to the first switch module 102. Therefore, by combining active balancing and passive balancing, balancing can be performed according to the actual conditions of different battery cells, thereby improving the accuracy of battery system balancing.

[0048] Embodiments of the present application provide a battery system balancing method, an electronic device, and a storage medium.

[0049] Among them, the battery system balancing method can be specifically applied in a terminal, which may include a tablet computer or a personal computer (PC). The terminal can establish a wired or wireless connection with a server, and the server may include an independently running server or a distributed server, or may include a server cluster consisting of multiple servers.

[0050] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0051] A battery system balancing method comprises: monitoring the static voltage of each battery cell in a battery pack at a charging end and a discharging end; determining the battery cells that meet a first preset condition and the battery cells that meet a second preset condition in the battery pack according to the static voltage of each battery cell at the charging end and the static voltage of each battery cell at the discharging end; passively balancing the battery cells that meet the first preset condition according to a second switch module, and / or; actively balancing the battery cells that meet the second preset condition according to the first switch module.

[0052] See also Figure 3 , Figure 3 A schematic diagram of a flow chart of a battery system balancing method provided in an embodiment of the present application. The specific flow chart of the battery system balancing method may be as follows:

[0053] 201. At the end of charging and discharging, monitor the static voltage of each cell in the battery pack.

[0054] The end of charge occurs at the final stage of the battery charging process, when the battery voltage reaches the preset charge cut-off voltage. At this stage, the battery management system (BMS) switches to constant voltage charging mode to prevent overcharging. At the end of charge, the battery voltage stabilizes at a higher level and the current gradually decreases until the charging process ends. The end of discharge refers to the final stage of the battery discharge process, when the battery voltage drops to the preset discharge cut-off voltage. At the end of discharge, in order to protect the battery from over-discharge, the BMS stops the discharge process. The battery voltage at this stage will be relatively low, and the discharge current will gradually decrease until the battery is fully discharged.

[0055] After a battery pack has finished charging or discharging, the cells enter a rest phase where the battery management system (BMS) monitors the voltage of each cell to determine its voltage level when no current is flowing.

[0056] 202. Determine, in the battery pack, battery cells that meet a first preset condition and battery cells that meet a second preset condition according to the static voltage of each battery cell at the charging end and the static voltage of each battery cell at the discharging end.

[0057] The first preset condition refers to the cell voltage reaching or exceeding the set voltage threshold at the end of charging. The first preset condition is used to identify those cells with higher voltages, which may need to be lowered by passive balancing. For example, the equalization start-up condition of the ternary lithium battery pack may set the cell voltage to be above 4.15V (single-cell fully charged voltage 4.2V), and the maximum voltage difference between cells is 0.05mV when the equalization is turned on. The second preset condition refers to the cell voltage being lower than the set voltage threshold at the end of discharge. The second preset condition is used to identify those cells with lower voltages, which need to be increased by active balancing.

[0058] For example, at the end of charging and discharging, the BMS collects static voltage data for each cell. The BMS calculates the average voltage of the entire battery pack, which usually involves adding the voltages of all cells and dividing by the number of cells. The BMS can set two voltage thresholds for determining the first preset condition and the second preset condition. These thresholds can be fixed or dynamically adjusted based on the battery type and usage conditions. The BMS then compares the voltage of each cell with the average voltage and the preset thresholds. The BMS identifies cells with voltages higher than the average voltage plus a positive threshold. These cells are considered to be high-charge and high-discharge cells (i.e., cells that meet the first preset condition); the BMS identifies cells with voltages lower than the average voltage minus a negative threshold. These cells are considered to be low-charge and low-discharge cells (i.e., cells that meet the second preset condition).

[0059] 203. Perform passive balancing on the battery cells that meet the first preset condition according to the second switch module.

[0060] Passive balancing is a technology in a battery management system (BMS) that is used to reduce the voltage difference between individual battery cells in a battery pack. Passive balancing achieves balancing by connecting a resistor in parallel to the battery cells with higher voltages. When these battery cells are fully charged, the excess energy is dissipated as heat through the resistor. The choice of resistor has an important impact on the balancing effect and energy loss. The resistance value is generally selected between a few ohms and tens of ohms. Too large or too small resistance will affect the balancing effect. The resistor is usually placed between the positive and negative poles of the battery cell to form a parallel circuit. In practical applications, the appropriate resistor position can be selected according to the structure and size of the battery pack. During the balancing process, the SOC value of the battery cell needs to be monitored. When a battery cell is detected to be fully charged, the balancing circuit is started to dissipate the excess energy through the resistor.

[0061] When the battery pack begins to charge, the BMS monitors the voltage of each cell. As the charging process progresses, the BMS detects that the voltage of some cells may rise faster. When the voltage of a cell reaches or exceeds the preset equalization voltage threshold (such as 4.2V), the BMS triggers the corresponding MOSFET switch to turn on, so that the resistor is connected in parallel with the battery, thereby starting the equalization process. At this time, the electrical energy in the cell with a higher voltage is consumed in the form of heat energy through the resistor, and the voltage begins to decrease.

[0062] Optionally, in some embodiments of the present application, the step of “passively balancing the battery cells that meet the first preset condition according to the second switch module” may specifically include:

[0063] The second switch component of the second switching module is closed to connect the battery cell that meets the first preset condition to the balancing circuit;

[0064] The battery cells meeting the first preset condition are passively balanced through the balancing circuit.

[0065] For example, please combine Figure 2 At the end of charging, the BMS monitors the static voltage of all cells and identifies cells with voltages higher than a preset threshold (i.e., cells that meet the first preset condition). For the identified high-voltage cells, the BMS closes the second switch component 1031 in the second switch module 103. After closing the second switch component 1031, the high-voltage cell is connected to the balancing circuit s. After the balancing circuit is turned on, the current in the high-voltage cell will flow through the second resistor 1032, converting electrical energy into heat energy, thereby reducing the voltage of the high-voltage cell. When the voltage of the high-voltage cell drops to the preset balancing stop voltage, or the voltage difference between the high-voltage cells is reduced to within a preset range, the BMS disconnects the second switch component 1031 and stops the passive balancing process.

[0066] Optionally, in some embodiments of the present application, the step of “passively balancing the battery cells that meet the first preset condition through a balancing circuit” may specifically include:

[0067] If the battery cells that meet the first preset condition belong to the same battery group, calculating a first average voltage value corresponding to the battery group where the battery cells that meet the first preset condition belong; and performing passive balancing on the battery cells that meet the first preset condition through a balancing circuit according to the first average voltage value;

[0068] If the battery cells meeting the first preset condition belong to different battery packs, the battery cells meeting the first preset condition are passively balanced synchronously through the balancing circuit.

[0069] If the battery cells that meet the first preset condition belong to the same battery pack, the BMS will calculate the average voltage of these battery cells as a reference value for balancing. For battery cells that meet the first preset condition, the BMS will close the second switch component 1031 in the second switch module. After closing the second switch component 1031, the battery cell is connected to the balancing circuit s. The current in the high-voltage battery cell will flow through the second resistor 1032, converting electrical energy into heat energy, thereby reducing the voltage of the battery cell. If the battery cells that meet the first preset condition belong to different battery packs, the BMS will synchronously perform passive balancing on these battery cells through the balancing circuit. This means that no matter which battery pack the battery cells belong to, as long as they meet the first preset condition, the BMS will start the passive balancing process at the same time.

[0070] The BMS calculates the difference between the voltage of each high-charge and high-discharge cell and the average voltage of the battery pack. If all cells that need to be balanced belong to the same battery pack, the BMS will balance these cells in order from largest to smallest according to the size of the voltage deviation from the average. This means that the cell with the largest voltage deviation from the average will be balanced first, followed by the next largest, and so on. If the cells that need to be balanced are distributed in different battery packs, the BMS can balance these cells at the same time without waiting for all cells in one battery pack to be balanced before starting the next battery pack. During passive balancing, the current in the cell passes through a resistor, converting excess electrical energy into heat energy, thereby reducing the voltage of the cell.

[0071] For example, a battery pack consists of 4 cells connected in series, and the full charge voltage of each cell is 4.2 V. At the end of charging, the BMS detects that the voltages of cells 1, 2, and 3 are 4.22 V, 4.23 V, and 4.25 V, respectively, while the voltage of cell 4 is 4.18 V. Cells 1, 2, and 3 meet the first preset condition and need to be passively balanced.

[0072] Balancing of the same battery pack: The BMS calculates the average voltage of cells 1, 2, and 3, assuming it is 4.23 V. The BMS then closes the second switch components of these cells, allowing current to flow through the second resistor, reducing the voltages of cells 1, 2, and 3 until they are close to 4.23 V. If cells 1 and 2 belong to battery pack A, and cell 3 belongs to battery pack B, the BMS will passively balance these cells at the same time, even if they belong to different battery packs.

[0073] 204. Actively balance the battery cells that meet the second preset condition according to the first switch module.

[0074] Active balancing achieves balancing by transferring energy from cells with higher voltage to cells with lower voltage. The advantage of this method is high energy utilization, because it does not dissipate excess energy in the form of heat, but transfers it to cells that need it.

[0075] Please combine Figure 2 For these low-voltage cells (i.e., cells that meet the second preset condition), the BMS turns on the first switch component 1021 in the first switch module to connect the cell to the active balancing circuit. One side of this switch component is connected to the cell, and the other side is connected to the first resistor 1022. For example, if the voltage of cell 1 is higher than the average voltage, and the voltage of cell 2 is lower than the average voltage, the BMS will transfer the energy of cell 1 to cell 2 through the switch component.

[0076] Optionally, in some embodiments of the present application, the step of “actively balancing the cells that meet the second preset condition according to the first switch module” may specifically include:

[0077] Closing the first switch component of the first switch module to connect the battery cell that meets the second preset condition to the balancing circuit;

[0078] The battery cells meeting the second preset condition are passively balanced through the balancing circuit.

[0079] For example, for a battery cell that meets the second preset condition, the BMS will close the first switch component 1021 in the first switch module, so that the battery cell is connected to the balancing loop s. After closing the first switch component, the battery cell is connected to the balancing loop s, and the current in the battery cell flows through the first resistor 1022, converting electrical energy into heat energy, thereby reducing the voltage of the battery cell.

[0080] Optionally, in some embodiments of the present application, the step of “passively balancing the battery cells that meet the second preset condition through the balancing circuit” may specifically include:

[0081] Obtaining a second average voltage value of the battery pack where the battery cells meeting the second preset condition are located;

[0082] Determining the number of battery cells corresponding to the battery cells that meet the second preset condition;

[0083] According to the number of battery cells and the second average voltage value, the battery cells meeting the second preset condition are passively balanced through the balancing circuit.

[0084] For example, specifically, for the battery pack where the battery cells that meet the second preset condition are located, the BMS calculates the average voltage of these battery cells (i.e., the second average voltage value). The BMS determines the number of battery cells that meet the second preset condition, that is, the number of battery cells that need to be passively balanced. For these low-voltage battery cells, the BMS closes the second switch component 1031 in the second switch module so that the battery cell is connected to the balancing circuit s. After closing the second switch component 1031, the battery cell is connected to the balancing circuit s, and the current in the low-voltage battery cell flows through the second resistor 1032, converting electrical energy into heat energy, thereby reducing the voltage of the battery cell.

[0085] Furthermore, assume that a battery pack consists of 4 cells connected in series, and the full discharge voltage of each cell is 3.0 V. At the end of discharge, the BMS detects that the voltages of cells 1, 2, and 3 are 3.05 V, 3.03 V, and 3.02 V, respectively, while the voltage of cell 4 is 2.98 V. Cell 4 meets the second preset condition and needs to be actively balanced.

[0086] The BMS calculates the average voltage of cells 1, 2, and 3, assuming it is 3.03 V. Then, the BMS closes the first switch component of cell 4, so that cell 4 is connected to the active balancing circuit, and energy is transferred from cells 1, 2, and 3 to cell 4 until the voltage of cell 4 is close to 3.03 V.

[0087] If cells 1 and 2 belong to battery pack A, and cells 3 and 4 belong to battery pack B, the BMS will transfer energy between the two battery packs through an active balancing circuit to achieve cell voltage balance.

[0088] The battery system balancing solution provided in the present application can, after determining the battery cells that meet the first preset condition and the battery cells that meet the second preset condition in the battery pack, passively balance the battery cells that meet the first preset condition according to the second switch module, and / or actively balance the battery cells that meet the second preset condition according to the first switch module. Therefore, by combining active balancing and passive balancing, balancing can be performed according to the actual conditions of different battery cells, thereby improving the accuracy of battery system balancing.

[0089] In addition, the present application also provides an electronic device, such as Figure 4 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0090] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 4 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0091] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302 and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0092] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and battery system balancing by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0093] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0094] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0095] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows:

[0096] At the charging end and the discharging end, the static voltage of each battery cell in the battery pack is monitored; based on the static voltage of each battery cell at the charging end and the static voltage of each battery cell at the discharging end, the battery cells that meet the first preset condition and the battery cells that meet the second preset condition are determined in the battery pack; the battery cells that meet the first preset condition are passively balanced according to the second switch module, and / or; the battery cells that meet the second preset condition are actively balanced according to the first switch module.

[0097] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0098] The embodiment of the present application monitors the static voltage of each battery cell in the battery pack at the charging end and the discharging end; determines the battery cells that meet the first preset condition and the battery cells that meet the second preset condition in the battery pack according to the static voltage of each battery cell at the charging end and the static voltage of each battery cell at the discharging end; performs passive balancing on the battery cells that meet the first preset condition according to the second switch module, and / or; performs active balancing on the battery cells that meet the second preset condition according to the first switch module. The battery system balancing solution provided by the present application, after determining the battery cells that meet the first preset condition and the battery cells that meet the second preset condition in the battery pack, can perform passive balancing on the battery cells that meet the first preset condition according to the second switch module, and / or; perform active balancing on the battery cells that meet the second preset condition according to the first switch module, thereby, by combining active balancing and passive balancing, balancing can be performed according to the actual conditions of different battery cells, thereby improving the accuracy of battery system balancing.

[0099] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0100] To this end, an embodiment of the present application provides a storage medium in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any battery system balancing method provided in the embodiment of the present application. For example, the instructions can execute the following steps:

[0101] At the charging end and the discharging end, the static voltage of each battery cell in the battery pack is monitored; based on the static voltage of each battery cell at the charging end and the static voltage of each battery cell at the discharging end, the battery cells that meet the first preset condition and the battery cells that meet the second preset condition are determined in the battery pack; the battery cells that meet the first preset condition are passively balanced according to the second switch module, and / or; the battery cells that meet the second preset condition are actively balanced according to the first switch module.

[0102] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0103] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0104] Since the instructions stored in the storage medium can execute the steps in any one of the battery system balancing methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the battery system balancing methods provided in the embodiments of the present application can be achieved. For details, please refer to the previous embodiments and will not be repeated here.

[0105] The above is a detailed introduction to a battery system balancing method, an electronic device, and a storage medium provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A battery system balancing circuit, characterized in that: include: A plurality of battery packs, each of which is provided with a plurality of battery cells; A first switch module, one side of the first switch module is connected to the battery cell, and the other side of the first switch module is connected to a balancing circuit; A second switch module, the second switch module is connected to the battery pack through a balancing circuit; Among them, when the battery cells of the battery pack meet the first preset condition, the battery cells that meet the first preset condition are passively balanced according to the second switch module, and / or; when the battery cells of the battery pack meet the second preset condition, the battery cells that meet the second preset condition are actively balanced according to the first switch module.

2. The battery system equalization circuit according to claim 1, characterized in that: The first switch module includes a first switch component and a first resistor, wherein one side of the first switch component is connected to the battery cell, the other side of the first switch component is connected to the first resistor, and the first switch component is connected to the balancing circuit through the first resistor.

3. The battery system equalization circuit according to claim 2, characterized in that: When the battery cells of the battery pack meet the second preset condition, the first switch component is closed, and the battery cells meeting the second preset condition are actively balanced through the balancing circuit.

4. The battery system equalization circuit according to claim 1, characterized in that: The second switch module includes a second switch component and a second resistor, wherein one side of the second switch component is connected to the balancing loop, the other side of the second switch component is connected to one side of the second resistor, and the other side of the second resistor is connected to the balancing loop.

5. The battery system equalization circuit according to claim 4, characterized in that: When the battery cells of the battery pack meet the first preset condition, the second switch component is closed, and the battery cells meeting the first preset condition are passively balanced through the balancing circuit.

6. A battery system balancing method, applied to the battery system balancing circuit according to any one of claims 1 to 4, characterized in that: include: At the end of charging and discharging, monitoring the static voltage of each cell in the battery pack; Determining, in the battery pack, a battery cell that meets a first preset condition and a battery cell that meets a second preset condition according to a static voltage of each battery cell at a charging terminal and a static voltage of each battery cell at a discharging terminal; Passively balancing the battery cells that meet the first preset condition according to the second switch module, and / or; Active balancing is performed on the battery cells that meet the second preset condition according to the first switch module.

7. The battery system balancing method according to claim 6, characterized in that: The passive balancing of the battery cells meeting the first preset condition according to the second switch module includes: Closing the second switch component of the second switching module to connect the battery cell that meets the first preset condition to the balancing circuit; The battery cells meeting the first preset condition are passively balanced through the balancing circuit.

8. The battery system balancing method according to claim 7, characterized in that: The passive balancing of the battery cells meeting the first preset condition by the balancing circuit includes: If the battery cells satisfying the first preset condition belong to the same battery group, calculating a first average voltage value corresponding to the battery group where the battery cells satisfying the first preset condition belong; and performing passive balancing on the battery cells satisfying the first preset condition through the balancing circuit according to the first average voltage value; If the battery cells meeting the first preset condition belong to different battery packs, the battery cells meeting the first preset condition are passively balanced synchronously through the balancing circuit.

9. The battery system balancing method according to claim 6, characterized in that: The actively balancing the cells that meet the second preset condition according to the first switch module includes: Closing the first switch component of the first switch module to connect the battery cells that meet the second preset condition to the balancing circuit; The battery cells meeting the second preset condition are passively balanced through the balancing circuit.

10. The battery system balancing method according to claim 9, characterized in that: The passive balancing of the battery cells meeting the second preset condition by the balancing circuit includes: Obtaining a second average voltage value of the battery pack where the battery cells meeting the second preset condition are located; Determining the number of battery cells corresponding to the battery cells that meet the second preset condition; According to the number of battery cells and the second average voltage value, the battery cells meeting the second preset condition are passively balanced through the balancing circuit.

11. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the battery system balancing method according to any one of claims 5 to 10 are implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the battery system balancing method as claimed in any one of claims 5 to 10 are implemented.

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