Battery control device, control method, electronic apparatus, vehicle, medium, and product

Abstract

The invention discloses a battery control device, a battery control method, electronic equipment, a vehicle, a computer readable storage medium and a computer program product, the device comprises a control module and a battery module, the battery module comprises a plurality of battery units, and the control module is electrically connected with the battery module. And the control module is configured to control the running state of each battery unit according to the magnetic field attribute of the battery module, so that the residual capacities of the battery units are matched with one another. Thus, the situation that the remaining capacity of each battery unit in the battery module is greatly different during self-heating of the battery module can be avoided, the consistency of the remaining capacity of each battery unit in the battery module can be guaranteed, and normal operation of the vehicle based on power supply of the battery module can be guaranteed.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a battery control device, a battery control method, an electronic device, a vehicle, a computer-readable storage medium, and a computer program product. Background Art

[0002] To improve the performance degradation of lithium iron phosphate (LiFePO4) batteries in low-temperature environments, related technologies have proposed battery self-heating technology, which actively heats the battery through discharge and internal resistance, thereby improving battery performance in low-temperature conditions. However, due to factors such as battery specifications and remaining battery life, the discharge efficiency of different batteries varies. Consequently, after the battery self-heating period ends, the remaining current (State of Charge, SOC) of different batteries in the vehicle may vary, which to some extent affects the battery usage of the vehicle and may even pose a safety risk. Summary of the Invention

[0003] The present application provides a battery control device, a battery control method, an electronic device, a vehicle, a computer-readable storage medium, and a computer program product.

[0004] A battery control device provided in an embodiment of the present application includes a control module and a battery module, wherein the battery module includes a plurality of battery cells, and the control module is electrically connected to the battery module;

[0005] The control module is configured to control the operating state of each of the battery cells according to the magnetic field properties of the battery module so that the remaining capacities of the battery cells match each other.

[0006] Thus, in the embodiments of the present application, the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module, so that the remaining capacity of each battery cell matches each other. This can avoid the situation where there are large differences in the remaining capacity of each battery cell in the battery module when the battery module self-heats, thereby ensuring the consistency of the remaining capacity of each battery cell in the battery module, and thus ensuring the normal operation of the vehicle based on the power supply of the battery module. In addition, the embodiments of the present application can control the operating state of each battery cell in the battery module according to the magnetic field properties of the battery module. Therefore, compared with the method of detecting the difference in the remaining capacity of different battery cells through dual-channel integration operation, it can avoid the problems caused by shunt temperature drift and analog-to-digital converter quantization. Therefore, it can control the operating state of each battery cell in the battery module with higher precision, thereby effectively ensuring the matching of the remaining capacity of each battery cell.

[0007] In certain embodiments of the present application, the apparatus includes a detection device for detecting properties of the magnetic field, and the control module is electrically connected to the detection device.

[0008] Thus, in the embodiment of the present application, the magnetic field properties of the battery module can be detected by the detection device, thereby achieving the acquisition of the magnetic field properties of the battery module.

[0009] In certain embodiments of the present application, the detection device includes a magnetic ring, the positive pole wire of the battery module is arranged around one side of the magnetic ring along a first direction, and the negative pole wire of the battery module is arranged around the other side of the magnetic ring along a second direction, and the first direction is opposite to the second direction.

[0010] In this way, in an embodiment of the present application, the positive pole wire of the battery module can be arranged in a first direction around one side of the magnetic ring of the detection module, and the negative pole wire of the battery module can be arranged in a second direction around the other side of the magnetic ring, thereby realizing the magnetic field property detection of the battery module through the magnetic ring.

[0011] In certain embodiments of the present application, the device includes a resistor connected in series with one of the battery cells.

[0012] Thus, in the embodiment of the present application, a resistor may be provided in series with a battery cell, so that the voltage, current and other properties of the resistor may be measured to serve as a reference for the voltage, current and other properties of each battery cell in the battery module.

[0013] In certain embodiments of the present application, the device includes a first switching device, the battery module is connected to the first switching device, the first switching device is connected to the control module, and the open and closed state of the first switching device is related to the operating state of the battery unit.

[0014] Thus, in the embodiment of the present application, the operating state of each battery cell can be adjusted by the first switching device, thereby adjusting the residual current of each battery cell to match each other.

[0015] In certain embodiments of the present application, the first switching device includes a capacitor, at least one bridge arm and at least one inductor, each of the bridge arms includes an upper bridge tube and a lower bridge tube arranged in series, the connection node between the upper bridge tube and the lower bridge tube is connected to one of the inductors, and the capacitor is arranged in parallel with the bridge arm.

[0016] Thus, in the embodiment of the present application, the first switching device can be realized by a capacitor, at least one inductor, at least one bridge arm provided with an upper bridge tube and a lower bridge tube, and at least one inductor.

[0017] In certain embodiments of the present application, the device includes a second switching device, the battery module is electrically connected to the second switching device, the second switching device is connected to the control module, the battery module can generate heat when the second switching device is in a closed state, and the battery module cannot generate heat when the second switching device is in a disconnected state.

[0018] Thus, in the embodiment of the present application, the heat generation control of the battery module can be achieved through the second switching device.

[0019] An embodiment of the present application provides a battery control method, which is applied to the above-mentioned battery control device, and includes:

[0020] The operating state of each of the battery cells is controlled according to the magnetic field properties of the battery module so that the remaining capacities of the battery cells match each other.

[0021] Thus, in the embodiments of the present application, the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module, so that the remaining capacity of each battery cell matches each other. This can avoid the situation where there are large differences in the remaining capacity of each battery cell in the battery module when the battery module self-heats, thereby ensuring the consistency of the remaining capacity of each battery cell in the battery module, and thus ensuring the normal operation of the vehicle based on the power supply of the battery module. In addition, the embodiments of the present application can control the operating state of each battery cell in the battery module according to the magnetic field properties of the battery module. Therefore, compared with the method of detecting the difference in the remaining capacity of different battery cells through dual-channel integration operation, it can avoid the problems caused by shunt temperature drift and analog-to-digital converter quantization. Therefore, it can control the operating state of each battery cell in the battery module with higher precision, thereby effectively ensuring the matching of the remaining capacity of each battery cell.

[0022] In certain embodiments of the present application, controlling the operating state of each of the battery cells according to the magnetic field properties of the battery module so that the remaining capacities of the battery cells match each other includes:

[0023] When the temperature of the battery module is less than or equal to a preset temperature, the operating state of each of the battery cells is controlled according to the magnetic field properties.

[0024] Thus, in the embodiment of the present application, when the temperature of the battery module is less than or equal to the preset temperature, the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module, so that the operating state control of each battery cell can be carried out robustly.

[0025] In certain embodiments of the present application, the apparatus includes a second switching device, wherein when the second switching device is in a closed state, the battery module can generate heat, and when the second switching device is in an open state, the battery module cannot generate heat. When the temperature of the battery module is less than or equal to a preset temperature, controlling the operating state of each battery cell according to the magnetic field properties includes:

[0026] When the temperature of the battery module is less than or equal to the preset temperature, the second switching device is controlled to be in a closed state, and the operating state of each of the battery cells is controlled according to the magnetic field properties.

[0027] In this way, in an embodiment of the present application, when the temperature of the battery module is less than or equal to the preset temperature, the second switching device can be controlled to be in a closed state, and the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module. Thus, the operating state of each battery cell in the battery module can be controlled based on the magnetic field properties of the battery module capable of generating heat, and further, the remaining power of each battery cell in the battery module capable of generating heat can be matched with each other to a certain extent.

[0028] In certain embodiments of the present application, the apparatus includes a first switching device, the battery module is connected to the first switching device, each bridge arm of the first switching device includes an upper bridge tube and a lower bridge tube arranged in series, and the apparatus controls the operating state of each battery cell according to the magnetic field properties of the battery module so that the remaining capacity of each battery cell matches each other, including:

[0029] The operating state of each of the battery cells is determined based on the magnetic field properties when the first switching device is in a first preset state and the magnetic field properties when the first switching device is in a second preset state, so that the remaining capacity of each of the battery cells matches each other, wherein, when the first switching device is in the first preset state, the upper bridge tube is in a closed state and the lower bridge tube is in a disconnected state; when the first switching device is in the second preset state, the upper bridge tube is in a disconnected state and the lower bridge tube is in a closed state.

[0030] In this way, in an embodiment of the present application, the operating state of each battery cell can be determined based on the magnetic field properties of the first switching device in the first preset state and the magnetic field properties of the first switching device in the second preset state, so that the remaining capacity of each battery cell matches each other, thereby realizing the control of the operating state of the battery cell.

[0031] In certain embodiments of the present application, the magnetic field attribute includes magnetic field strength, and determining the operating state of each battery cell based on the magnetic field attribute when the first switching device is in a first preset state and the magnetic field attribute when the first switching device is in a second preset state so as to match the remaining capacity of each battery cell includes:

[0032] determining a current difference between a current operating current of a battery cell and a current operating current of another battery cell based on a magnetic field strength when the first switching device is in a first preset state and a magnetic field strength when the first switching device is in a second preset state;

[0033] The operating state of each of the battery cells is determined according to the current difference.

[0034] Thus, in an embodiment of the present application, the current difference between the current operating current of a battery cell and the current operating current of another battery cell can be determined based on the magnetic field strength when the first switching device is in the first preset state and the magnetic field strength when the first switching device is in the second preset state, and the operating state of each battery cell can be determined based on the current difference, thereby realizing the conversion from magnetic field strength to operating current.

[0035] In certain embodiments of the present application, determining the operating state of each battery cell according to the current difference includes:

[0036] Determining a current remaining capacity difference between one battery cell and another battery cell according to the current operating current difference and the continuous operation duration of the battery module;

[0037] The operating state of each of the battery cells is controlled according to the current residual capacity difference.

[0038] Thus, in an embodiment of the present application, the current remaining capacity difference of one battery cell relative to another battery cell can be determined based on the current operating current difference of one battery cell relative to the current operating current of another battery cell, and the continuous working time of the battery module, and the operating state of each battery cell can be controlled based on the current remaining capacity difference, so that the operating state of each battery cell can be determined based on the current remaining capacity difference between the battery cells, thereby ensuring effective control of the operating state of the battery cells.

[0039] In certain embodiments of the present application, controlling the operating state of each battery cell according to the current remaining capacity difference includes:

[0040] When the current remaining capacity difference is greater than or equal to a first preset threshold, the duty cycle of the upper bridge tube and the duty cycle of the lower bridge tube are controlled to control the operating state of each of the battery cells so that the remaining capacity of each of the battery cells matches each other.

[0041] In this way, in the embodiment of the present application, when the current remaining capacity difference is greater than or equal to the first preset threshold value, the opening and closing states of the upper bridge tube and the lower bridge tube can be controlled to control the operating state of each battery cell, so that the remaining capacity of each battery cell matches each other, so that the operating state of the battery cell can be adjusted based on the opening and closing states of the upper bridge tube and the lower bridge tube.

[0042] In certain embodiments of the present application, the operating state includes an operating current, the multiple battery cells include a first battery cell and a second battery cell, the operating current of the first battery cell is positively correlated with the duty cycle of the upper bridge tube, and the operating current of the second battery cell is positively correlated with the duty cycle of the lower bridge tube, and when the current remaining capacity difference is greater than or equal to a first preset threshold, controlling the duty cycle of the upper bridge tube and the duty cycle of the lower bridge tube to control the operating state of each of the battery cells so that the remaining capacity of each of the battery cells matches each other, includes:

[0043] When the absolute value of the current remaining capacity difference is greater than or equal to a first preset threshold value and the current remaining capacity difference is greater than zero, controlling the duty cycle of the upper bridge transistor to decrease and controlling the duty cycle of the lower bridge transistor to increase; and / or,

[0044] When the absolute value of the current remaining capacity difference is greater than or equal to a first preset threshold and the current remaining capacity difference is less than zero, the duty cycle of the upper bridge tube is controlled to increase, and the duty cycle of the lower bridge tube is controlled to decrease.

[0045] Thus, in an embodiment of the present application, when the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold value, and the current remaining capacity difference is greater than zero, the duty cycle of the upper bridge tube can be controlled to decrease, and the duty cycle of the lower bridge tube can be controlled to increase; and / or, when the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold value, and the current remaining capacity difference is less than zero, the duty cycle of the upper bridge tube can be controlled to increase, and the duty cycle of the lower bridge tube can be controlled to decrease, thereby realizing duty cycle control for the upper bridge tube and the lower bridge tube.

[0046] In certain embodiments of the present application, the method further comprises:

[0047] When the current remaining capacity difference is less than a second preset threshold and a preset stop operation instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube, so that the battery module stops generating heat.

[0048] Thus, in the embodiment of the present application, when the current remaining capacity difference is less than the second preset threshold value and the preset stop working instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube, thereby completing

[0049] In certain embodiments of the present application, the method further comprises:

[0050] When the current remaining capacity difference is greater than a third preset threshold and a preset stop-work instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube so that the battery module stops generating heat, and the current remaining capacity difference is stored.

[0051] Thus, in the embodiment of the present application, when the current remaining capacity difference is greater than the third preset threshold value and the preset stop working instruction is obtained, the duty cycle of the upper bridge tube can be controlled to be the same as the duty cycle of the lower bridge tube, so that the battery module stops generating heat, and the current remaining capacity difference is stored, so that the operating state of the battery unit can be controlled according to the stored current remaining capacity difference.

[0052] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the above-mentioned battery control method is implemented.

[0053] An embodiment of the present application provides a vehicle, comprising the above-mentioned electronic device.

[0054] An embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by one or more processors, the above-mentioned battery control method is implemented.

[0055] An embodiment of the present application provides a computer program product, including a computer program / instruction, which implements the above-mentioned battery control method when executed by a processor.

[0056] The electronic device, vehicle, computer-readable storage medium, and computer program product provided by the embodiments of the present application can control the operating state of each battery cell in the battery module based on the magnetic field properties of the battery module, thereby matching the remaining capacity of each battery cell. This can avoid the situation where there is a large difference in the remaining capacity of each battery cell in the battery module when the battery module self-heats, thereby ensuring the consistency of the remaining capacity of each battery cell in the battery module, and thus ensuring the normal operation of the vehicle based on the battery module. In addition, the embodiments of the present application can control the operating state of each battery cell in the battery module based on the magnetic field properties of the battery module. Therefore, compared with the method of detecting the difference in the remaining capacity of different battery cells through dual-channel integration operations, it can avoid the problems caused by shunt temperature drift and analog-to-digital converter quantization. Therefore, it can control the operating state of each battery cell in the battery module with higher precision, thereby effectively ensuring the matching of the remaining capacity of each battery cell.

[0057] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0059] Figure 1 This is a schematic diagram of a battery control device in certain embodiments of the present application;

[0060] Figure 2 This is a schematic diagram of a battery control device in certain embodiments of the present application;

[0061] Figure 3 This is a flowchart of a battery control method in certain embodiments of the present application;

[0062] Figure 4 This is a flowchart of a battery control method in certain embodiments of the present application;

[0063] Figure 5 This is a flowchart of a battery control method in certain embodiments of the present application;

[0064] Figure 6 This is a flowchart of a battery control method in certain embodiments of the present application;

[0065] Figure 7 Schematic diagram of a flow chart of a battery control method in certain embodiments of the present application. DETAILED DESCRIPTION

[0066] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0067] In recent years, the new energy vehicle industry has experienced explosive growth, with market penetration continuing to increase and the industry boasting broad prospects for development. As a mainstream power source, lithium iron phosphate (LiFePO4) batteries are widely used due to their advantages such as high energy density and long cycle life. However, lithium iron phosphate (LiFePO4) batteries have significant performance degradation issues in low-temperature environments, including a sharp drop in rate performance, a significant reduction in driving range, and reduced charging efficiency. Therefore, the performance degradation of lithium iron phosphate batteries in low-temperature environments has become a key factor restricting consumers from purchasing new energy vehicle models. In response to this situation, battery self-heating technology has been proposed in related technologies, which involves designing the battery pack into a symmetrical module and reusing the high-frequency alternating current generated by the motor and electronic control system, thereby achieving efficient Joule heat self-heating through the internal resistance of the battery, thereby significantly improving the performance of the battery in low-temperature conditions.

[0068] Specifically, the self-heating technology in the related art divides the battery pack into two modules, the upper and lower modules, and reuses the electronic control system to achieve self-heating of the battery module with the help of the positive / negative dual circuit. However, due to the differences in switching characteristics and control signal delays between different IGBTs (Insulate-Gate Bipolar Transistors) in the electronic control system, a current deviation occurs between the upper and lower bridge arms. As a result, different battery cells are prone to accumulate differences in SOC (residual current, State Of Charge) of different battery pack groups after long-term self-heating. When the accumulated SOC estimation error of the system exceeds the calibration threshold of the BMS (Battery Management System), an SOC jump phenomenon will occur. In addition, under low temperature conditions, if the charging current exceeds the limit, it may also trigger the risk of lithium plating.

[0069] In related technologies, to avoid SOC jumps and the risk of lithium plating, shunts are typically placed on the positive and negative busbars, and dual-channel integration is used to detect SOC differences between different battery packs. Understandably, this approach introduces shunt temperature drift and ADC (Analog to Digital Converter) quantization errors, making it difficult to effectively address the cumulative SOC error problem.

[0070] Based on the above problems you may encounter, please refer to Figure 1An embodiment of the present application provides a battery control device 100, including a control module 110 and a battery module 120, the battery module 120 including a plurality of battery cells 121, the control module 110 being electrically connected to the battery module 120, and the control module 110 being configured to control the operating state of each battery cell 121 according to the magnetic field properties of the battery module 120 so that the remaining capacity of each battery cell 121 matches each other.

[0071] Specifically, in the embodiment of the present application, the vehicle can control the operating status of each battery cell 121 in the battery module 120 according to the magnetic field properties of the battery module 120, such as adjusting the operating current, operating voltage, etc. of each battery cell 121 in the battery module 120, so that during the self-heating process of the battery module 120, the remaining capacity of each battery cell 121 can match each other.

[0072] Thus, in the embodiments of the present application, the operating state of each battery cell 121 in the battery module 120 can be controlled based on the magnetic field properties of the battery module 120, thereby matching the remaining capacity of each battery cell 121. This can prevent significant differences in the remaining capacity of each battery cell 121 within the battery module 120 when the battery module 120 self-heats, thereby ensuring consistency in the remaining capacity of each battery cell 121 within the battery module 120 and, in turn, ensuring normal operation of the vehicle powered by the battery module 120. Furthermore, the embodiments of the present application can control the operating state of each battery cell 121 in the battery module 120 based on the magnetic field properties of the battery module 120. Therefore, compared to a method of detecting differences in the remaining capacity of different battery cells 121 through dual-channel integration operations, this method avoids issues caused by shunt temperature drift and analog-to-digital converter quantization. Consequently, the operating state of each battery cell 121 in the battery module 120 can be controlled with higher precision, effectively ensuring matching of the remaining capacity of each battery cell 121.

[0073] In one example, the battery module 120 is a vehicle power battery.

[0074] In one example, the battery unit 121 is a battery pack.

[0075] In one example, the control module 110 is an ECU (Electronic Control Unit).

[0076] In one example, the control module 110 is a BMS (Battery Management System) or an ECU (Electronic Control Unit) electrically connected to the BMS.

[0077] In one example, the battery module 120 includes at least two battery cells 121 .

[0078] In one example, for any two battery cells 121 in the battery module 120, if the difference between the SOC of one battery cell 121 and the SOC of the other battery cell 121 is less than or equal to a preset threshold, the SOCs of the two battery cells 121 match each other.

[0079] Furthermore, in one example, the preset threshold is 5%. In another example, the preset threshold is in a value interval of [5%, 10%].

[0080] In one example, the magnetic field attribute includes one or more combinations of magnetic flux, magnetic field strength, and the like.

[0081] It can be understood that when a conductor is energized, the current will generate a magnetic field in the surrounding space, and the strength of the magnetic field is proportional to the current. Furthermore, when different battery packs in the control module 110 generate heat based on their own internal resistance, the magnetic field properties of the control module 110 can be measured to estimate the operating current differences of each battery pack, and then the SOC differences of each battery pack can be determined based on the operating current differences. For example, the operating current differences can be integrated to calculate the SOC differences of each battery pack.

[0082] It can also be understood that, because the operating status of each battery cell 121 in the battery module 120 is controlled by the magnetic field properties, compared to the method of detecting the difference in remaining power of different battery cells 121 through dual-channel integration operations, the situation caused by shunt temperature drift and analog-to-digital converter quantization can be avoided.

[0083] See also Figure 2 In certain embodiments of the present application, the device 100 includes a detection device 130 for detecting magnetic field properties, the control module 110 is electrically connected to the detection device 130 , and the battery module 120 is electrically connected to the detection device 130 .

[0084] Specifically, in the embodiment of the present application, the control module 110 may detect the magnetic field properties of the battery module 120 through the detection device 130 .

[0085] In one example, the detection device 130 is a Hall Component.

[0086] In such Figure 2 In one example shown, the detection device 130 includes a first Hall sensor and a second Hall sensor, wherein the first Hall sensor is located at Figure 2 The second Hall sensor is located in the preset range of the battery cell 121 (let the battery pack be C1) at the upper position of the middle Figure 2 The battery cell 121 in the lower middle position is within the preset range (let the battery pack be C2), and then the first Hall sensor can detect the magnetic field strength of C1 (let the magnetic field strength be B1), and the second Hall sensor can detect the magnetic field strength of C2 (let the magnetic field strength be B2), and then the control module 110 can calculate the difference between the current operating current of C1 and the current operating current of C2 according to the difference between B1 and B2, and then, according to the difference between the current operating current of C1 and the current operating current of C2, calculate the difference between the SOC of C1 and the SOC of C2 after both C1 and C2 have been self-heated for a period of time.

[0087] Thus, in the embodiment of the present application, the magnetic field properties of the battery module 120 can be detected by the detection device 130, thereby acquiring the magnetic field properties of the battery module 120.

[0088] Please refer again Figure 2 In certain embodiments of the present application, the detection device 130 includes a magnetic ring, the positive pole wire of the battery module 120 is arranged on one side of the magnetic ring along a first direction, and the negative pole wire of the battery module 120 is arranged on the other side of the magnetic ring along a second direction, and the first direction is opposite to the second direction.

[0089] Specifically, in the embodiment of the present application, the detection module may include a magnetic ring with positive and negative busbars wound in opposite directions, and implement magnetic field property detection of the battery module 120 based on the magnetic ring.

[0090] Specifically, such as Figure 2 As shown, for Figure 2 The positive lead (or positive bus bar) of the battery cell 121 in the upper middle position is located Figure 2 The negative electrode wire (or negative busbar) of the battery unit 121 at the lower middle position, these two wires are wound around the magnetic ring of the detection device 130 in opposite directions.

[0091] In one example, the positive electrode wire is arranged to surround the magnetic ring in a clockwise direction, and the negative electrode busbar is arranged to surround the magnetic ring in a counterclockwise direction.

[0092] It is understandable that in Figure 2 In the example shown, the current direction of the positive wire and the current direction of the negative wire can form two magnetic field vectors with opposite directions in the magnetic ring. Since the magnitude of the magnetic field vector is related to the current operating current of the battery pack, the composite vector of the two magnetic field vectors can reflect the current of the battery pack. Figure 2 The difference between the current operating currents of the two battery packs.

[0093] In this way, in an embodiment of the present application, the positive pole wire of the battery module 120 can be arranged in a first direction around one side of the magnetic ring of the detection module, and the negative pole wire of the battery module 120 can be arranged in a second direction around the other side of the magnetic ring, thereby realizing the magnetic field property detection of the battery module through the magnetic ring.

[0094] Please refer again Figure 2 In some embodiments of the present application, the device 100 includes a resistor 140 connected in series with a battery cell 121 .

[0095] Specifically, in order to avoid measurement errors caused by interference from factors such as changes in the internal resistance of the battery cell 121 and polarization effects when directly measuring the operating current, operating voltage and other properties of the battery cell 121, in an embodiment of the present application, a resistor 140 is also provided in the control device 100. The resistor 140 is connected in series with a battery cell 121. Then, the operating current of the resistor 140 can be equivalent to the operating current of the battery cell 121, or the operating voltage of the resistor 140 can be collected to determine the operating current of the resistor 140, and then the operating current of the battery cell 121 is determined.

[0096] It can be understood that since the operating current of the resistor 140 is measured to determine the operating current of the battery cell 121, the operating current of the battery cell 121 is consistent with the resistance accuracy of the resistor 140 and the accuracy of the acquisition module used to collect the voltage or current of the resistor 140, thereby avoiding interference from factors such as changes in the internal resistance of the battery cell 121 and polarization effects.

[0097] It is also understandable that after the operating current of the resistor 140 is measured, the operating current of the resistor 140 can be used as a reference to determine the difference between the operating currents of the battery cells 121 in the battery module 120 .

[0098] In one example, the resistor 140 is a shunt resistor.

[0099] Thus, in the embodiment of the present application, a resistor 140 can be set in series with a battery cell 121, so that the voltage, current and other properties of the resistor 140 can be measured to serve as a reference for the voltage, current and other properties of each battery cell 121 in the battery module.

[0100] Please refer again Figure 2 In certain embodiments of the present application, the battery control device 100 includes a first switching device 150, the battery module 120 is connected to the first switching device 150, the first switching device 150 is connected to the control module 110, and the open and closed state of the first switching device 150 is related to the operating state of the battery cell 121.

[0101] Specifically, in the embodiment of the present application, a first switching device 150 is provided in the battery control device 100 , and then the control module 110 can adjust the on / off state of the first switching device 150 , thereby adjusting the operating state of each battery cell 121 .

[0102] Thus, in the embodiment of the present application, the operating state of each battery cell 121 can be adjusted by the first switching device 150, so that the residual currents of each battery cell 121 are adjusted to match each other.

[0103] Please refer again Figure 2 In certain embodiments of the present application, the first switching device 150 includes a capacitor 151, at least one bridge arm and at least one inductor 152. Each bridge arm includes an upper bridge tube 153 and a lower bridge tube 154 arranged in series. The connection node between the upper bridge tube 153 and the lower bridge tube 154 is connected to an inductor 152, and the capacitor 151 is arranged in parallel with the bridge arm.

[0104] Specifically, in the embodiment of the present application, the operating state of each battery cell 121 in the battery module can be changed by adjusting the duty cycle of the upper bridge tube 153 and the duty cycle of the lower bridge tube 154 of each bridge arm in the first switching device 150.

[0105] For example, for Figure 2 The battery cell 121 in the upper middle position (let the battery pack be C1), Figure 2 The battery cell 121 in the lower middle position (let the battery pack be C2), if the SOC of C1 is higher than C2, the Figure 2 The duty cycle of the three upper bridge tubes 153 is increased Figure 2 The duty cycle of the three lower bridge tubes 154 is adjusted to reduce the operating current of C1 and increase the operating current of C2, so that the SOC of C1 gradually matches the SOC of C2, or in other words, the difference between the SOC of C1 and the SOC of C2 gradually becomes less than or equal to the preset threshold.

[0106] In addition, it can also be understood that when the duty cycle of the upper bridge tube 153 and the duty cycle of the lower bridge tube 154 of each bridge arm are changed, high-frequency pulse current may be generated, causing bus current fluctuations. Therefore, the difficulty of current change can be increased through the inductor 152, thereby smoothing the current waveform.

[0107] Furthermore, in order to temporarily store electrical energy and stabilize the current, the capacitor 151 can be used to store and release electrical energy to avoid sudden changes in current and to prevent the current from exceeding the upper limit allowed.

[0108] Thus, in the embodiment of the present application, the first switching device 150 can be realized by a capacitor 151 , at least one inductor 152 , at least one bridge arm provided with an upper bridge tube 153 and a lower bridge tube 154 , and at least one inductor 152 .

[0109] Please refer again Figure 2 In certain embodiments of the present application, the device 100 includes a second switching device 160, the battery module 120 is electrically connected to the second switching device 160, the second switching device 160 is connected to the control module 110, and the battery module 120 can generate heat when the second switching device 160 is in a closed state, and the battery module 120 cannot generate heat when the second switching device 160 is in a disconnected state.

[0110] Specifically, in the embodiment of the present application, the battery control device 100 may include a second switching device 160 , and the second switching device 160 is used to control the self-heating of the battery module 120 .

[0111] In one example, if the control module 110 determines that the current temperature of the battery module 120 is less than or equal to a preset temperature, the control module 110 may control the switch device to be in a closed state to enable the battery module 120 to self-heat. Specifically, when the second switch device is in the closed state, each battery cell in the battery module can discharge and generate heat based on its own internal resistance to achieve self-heating. When the second switch device is in the open state, each battery cell in the battery module cannot discharge, thereby stopping self-heating.

[0112] In one example, when determining that the current temperature of the battery module 120 is greater than a preset temperature, the control module 110 may control the switch device to be in an off state to prevent the battery module 120 from self-heating.

[0113] In one example, the preset temperature is 10°C.

[0114] As such, in the embodiment of the present application, heat generation control of the battery module 120 can be achieved through the second switching device 160 .

[0115] See also Figure 3 Corresponding to the above-mentioned battery control device, an embodiment of the present application further provides a battery control method applied to the above-mentioned battery control device 100, the method comprising:

[0116] 01: Based on the magnetic field properties of the battery module, the operating status of each battery cell is controlled so that the remaining capacity of each battery cell matches each other.

[0117] The present application also provides an electronic device comprising a memory and a processor. The battery control method of the present application can be implemented by the electronic device of the present application. Specifically, the memory stores a computer program, and the processor is configured to control the operating state of each battery cell based on the magnetic field properties of the battery module to ensure that the remaining capacity of each battery cell matches each other.

[0118] Specifically, in the embodiment of the present application, the vehicle can control the operating status of each battery cell in the battery module according to the magnetic field properties of the battery module, such as adjusting the operating current, operating voltage, etc. of each battery cell in the battery module, so that the remaining capacity of each battery cell can match each other during the self-heating process of the battery module.

[0119] It can be understood that when a conductor is energized, the current will generate a magnetic field in the surrounding space, and the strength of the magnetic field is proportional to the current. Furthermore, when different battery packs in the control module generate heat based on their own internal resistance, the magnetic field properties of the control module can be measured to estimate the operating current differences of each battery pack, and then the SOC differences of each battery pack can be determined based on the operating current differences. For example, the operating current differences can be integrated to calculate the SOC differences of each battery pack.

[0120] It can also be understood that, because the operating status of each battery cell in the battery module is controlled by the magnetic field properties, compared with the method of detecting the difference in remaining power of different battery cells through dual-channel integration operations, the situation caused by shunt temperature drift and analog-to-digital converter quantization can be avoided.

[0121] In addition, it can be understood that the contents of the battery module, battery unit, etc. can refer to the relevant contents of the aforementioned battery control device, and to avoid repetition, they will not be repeated here.

[0122] Thus, in the embodiments of the present application, the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module, so that the remaining capacity of each battery cell matches each other. This can avoid the situation where there are large differences in the remaining capacity of each battery cell in the battery module when the battery module self-heats, thereby ensuring the consistency of the remaining capacity of each battery cell in the battery module, and thus ensuring the normal operation of the vehicle based on the power supply of the battery module. In addition, the embodiments of the present application can control the operating state of each battery cell in the battery module according to the magnetic field properties of the battery module. Therefore, compared with the method of detecting the difference in the remaining capacity of different battery cells through dual-channel integration operation, it can avoid the problems caused by shunt temperature drift and analog-to-digital converter quantization. Therefore, it can control the operating state of each battery cell in the battery module with higher precision, thereby effectively ensuring the matching of the remaining capacity of each battery cell.

[0123] In certain embodiments of the present application, step 01 includes:

[0124] When the temperature of the battery module is less than or equal to a preset temperature, the operating state of each battery cell is controlled according to the magnetic field properties.

[0125] The processor of the embodiment of the present application is further configured to control the operating state of each battery cell according to the magnetic field properties when the temperature of the battery module is less than or equal to a preset temperature.

[0126] Specifically, in an embodiment of the present application, the vehicle can detect the temperature of the battery module in real time, and when the temperature of the battery module is less than or equal to a preset temperature, control the operating status of each battery cell in the module according to the magnetic field properties of the battery module.

[0127] In one example, the preset temperature is 10 degrees Celsius.

[0128] In one example, when the temperature of the battery module is less than or equal to a preset temperature, the vehicle can control the discharge of each battery cell in the battery module. It is understood that when the battery cell discharges, the wire generates a magnetic field, and the vehicle can detect the magnetic field properties of the battery module while controlling the discharge of each battery cell in the battery module.

[0129] Thus, in the embodiment of the present application, when the temperature of the battery module is less than or equal to the preset temperature, the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module, so that the operating state control of each battery cell can be carried out robustly.

[0130] In certain embodiments of the present application, the battery control device includes a second switch device. When the second switch device is in a closed state, the battery module can generate heat, and when the second switch device is in an open state, the battery module cannot generate heat. Furthermore, when the temperature of the battery module is less than or equal to a preset temperature, the step of controlling the operating state of each battery cell according to the magnetic field properties includes:

[0131] When the temperature of the battery module is less than or equal to the preset temperature, the second switch device is controlled to be in a closed state, and the operating state of each battery unit is controlled according to the magnetic field properties.

[0132] The processor of the embodiment of the present application is also used to control the second switching device to be in a closed state when the temperature of the battery module is less than or equal to a preset temperature, and control the operating state of each battery cell according to the magnetic field properties.

[0133] Specifically, in this embodiment of the present application, the vehicle can control the second switch device to be closed when the battery module temperature is less than or equal to a preset temperature, allowing the battery module to generate heat. Furthermore, the vehicle can detect the magnetic field properties of the battery module when generating heat and thereby control the operating status of each battery cell within the battery module.

[0134] In one example, when the temperature of the battery module is less than or equal to a preset temperature, the vehicle may control the second switch device to be in a closed state to enable the battery module to self-heat.

[0135] In one example, when the temperature of the battery module is greater than a preset temperature, the vehicle may control the second switching device to be in an off state to stop the battery module from self-heating.

[0136] In this way, in an embodiment of the present application, when the temperature of the battery module is less than or equal to the preset temperature, the second switching device can be controlled to be in a closed state, and the operating state of each battery cell in the battery module can be controlled according to the magnetic field properties of the battery module. Thus, the operating state of each battery cell in the battery module can be controlled based on the magnetic field properties of the battery module that can generate heat, and further, the remaining power of each battery cell in the battery module that can generate heat can be matched with each other to a certain extent.

[0137] See also Figure 4 In certain embodiments of the present application, the battery control device includes a first switching device, the battery module is connected to the first switching device, and each bridge arm of the first switching device includes an upper bridge tube and a lower bridge tube arranged in series. Furthermore, step 01 includes:

[0138] 010: Determine the operating state of each battery cell based on the magnetic field properties of the first switching device in the first preset state and the magnetic field properties of the first switching device in the second preset state, so that the remaining capacity of each battery cell matches each other, wherein, when the first switching device is in the first preset state, the upper bridge tube is in a closed state and the lower bridge tube is in a disconnected state; when the first switching device is in the second preset state, the upper bridge tube is in a disconnected state and the lower bridge tube is in a closed state.

[0139] The processor of the embodiment of the present application is also used to determine the operating state of each battery cell based on the magnetic field properties of the first switching device in the first preset state and the magnetic field properties of the first switching device in the second preset state, so that the remaining capacity of each battery cell matches each other, wherein, when the first switching device is in the first preset state, the upper bridge tube is in a closed state and the lower bridge tube is in a disconnected state, and when the first switching device is in the second preset state, the upper bridge tube is in a disconnected state and the lower bridge tube is in a closed state.

[0140] Specifically, in the embodiment of the present application, the vehicle can detect the magnetic field properties of the switch module by alternately controlling the opening and closing of the upper and lower bridge tubes.

[0141] In one example, Figure 2For example, in the first 0-0.5ms, the vehicle can control all upper bridge tubes to be in the disconnected state and all lower bridge tubes to be in the closed state. At this time, after the positive electrode of the battery module outputs current, a magnetic field is generated along the first direction around the positive electrode wire (or positive busbar) set on the magnetic ring. The detection device detects that the magnetic field strength is B + .

[0142] Then, in the first 0.5-1ms, the vehicle can control all upper bridge tubes to be in the closed state and all lower bridge tubes to be in the open state. At this time, after the negative electrode of the battery module outputs current, a magnetic field is generated along the second direction around the negative electrode wire (or negative busbar) set on the magnetic ring. The detection device detects that the magnetic field strength is B - .

[0143] Finally, the vehicle can detect the two magnetic field strengths (B + 、B - ), controls the operating status of each battery cell so that the remaining capacity of each battery cell matches each other.

[0144] In this way, in an embodiment of the present application, the operating state of each battery cell can be determined based on the magnetic field properties of the first switching device in the first preset state and the magnetic field properties of the first switching device in the second preset state, so that the remaining capacity of each battery cell matches each other, thereby realizing the control of the operating state of the battery cell.

[0145] See also Figure 5 In some embodiments of the present invention, the magnetic field attribute includes magnetic field strength, and step 010 includes:

[0146] 0100: Determine a current difference between a current operating current of a battery cell and a current operating current of another battery cell based on a magnetic field strength when the first switching device is in a first preset state and a magnetic field strength when the first switching device is in a second preset state;

[0147] 0101: Determine the operating status of each battery cell based on the current difference.

[0148] The processor of the embodiment of the present application is also used to determine the current difference between the current operating current of a battery cell and the current operating current of another battery cell based on the magnetic field strength when the first switching device is in a first preset state and the magnetic field strength when the first switching device is in a second preset state, and to determine the operating state of each battery cell based on the current difference.

[0149] Specifically, in an embodiment of the present application, the current difference between the current operating current of a battery cell and the current operating current of another battery cell can be calculated based on the magnetic field strength of the battery module when the first switching device is in a first preset state and the magnetic field strength of the battery module when the first switching device is in a second preset state, and the operating state of each battery cell can be controlled based on the current difference.

[0150] For example, again using the above B + 、B - For example, if the positive wire (or positive busbar) is wound around the magnetic ring N times in the first direction, and the negative wire (or negative busbar) is wound around the magnetic ring N times in the second direction, then B + 、B - Satisfies the following two formulas, namely:

[0151] B + =k·I1·N

[0152] B - =k·I2·N

[0153] Where k is a preset constant.

[0154] Furthermore, the above two formulas can be changed into:

[0155] ΔI=I1-I2=(B + -B - )×w

[0156] Wherein, w is a preset coefficient related to the above-mentioned N and k, and ΔI is the current difference between the current operating current of one battery cell and the current operating current of another battery cell.

[0157] Thus, in an embodiment of the present application, the current difference between the current operating current of a battery cell and the current operating current of another battery cell can be determined based on the magnetic field strength when the first switching device is in the first preset state and the magnetic field strength when the first switching device is in the second preset state, and the operating state of each battery cell can be determined based on the current difference, thereby realizing the conversion from magnetic field strength to operating current.

[0158] See also Figure 6 In certain embodiments of the present application, step 0101 includes:

[0159] 01010: Determine the current remaining capacity difference of one battery cell relative to another battery cell based on the current operating current difference and the continuous working time of the battery module;

[0160] 01011: Control the operating status of each battery unit based on the current remaining capacity difference.

[0161] The processor of the embodiment of the present application is also used to determine the current remaining capacity difference of one battery cell relative to another battery cell based on the current operating current difference and the continuous working time of the battery module, and control the operating status of each battery cell based on the current remaining capacity difference.

[0162] Specifically, in an embodiment of the present application, when the current difference between the current operating current of a battery cell and the current operating current of another battery cell is determined, the remaining capacity difference between the current operating current of a battery cell and the current operating current of another battery cell can be calculated based on the battery difference and the continuous working time of the battery module.

[0163] It is understandable that the battery difference may be integrated over time to determine the remaining capacity difference between the current operating current of one battery cell and the current operating current of another battery cell based on the battery difference.

[0164] Furthermore, when determining the difference in remaining capacity between the current operating current of a battery cell and the current operating current of another battery cell, it can be judged that the deviation of the difference in remaining capacity between the current operating current of a battery cell and the current operating current of another battery cell is large, and the operating status of each battery cell is adjusted accordingly.

[0165] In one example, the vehicle may store the current remaining capacity difference at the end of the last self-heating, and then, the vehicle reads the current remaining capacity difference stored at the end of the last self-heating, and adjusts the operating status of each battery cell according to the current remaining capacity difference.

[0166] Thus, in the embodiment of the present application, the current remaining capacity difference of one battery cell relative to another battery cell can be determined based on the current operating current difference of one battery cell relative to the current operating current of another battery cell, and the continuous working time of the battery module, and the operating state of each battery cell can be controlled based on the current remaining capacity difference, so that the operating state of each battery cell can be determined based on the current remaining capacity difference between the battery cells, thereby ensuring effective control of the operating state of the battery cells.

[0167] In certain embodiments of the present application, step 01011 includes:

[0168] When the current remaining capacity difference is greater than or equal to the first preset threshold, the opening and closing states of the upper bridge tube and the lower bridge tube are controlled to control the operating state of each battery cell so that the remaining capacity of each battery cell matches each other.

[0169] The processor of the embodiment of the present application is also used to control the opening and closing states of the upper bridge tube and the lower bridge tube when the current remaining capacity difference is greater than or equal to a first preset threshold value, so as to control the operating state of each battery cell so that the remaining capacity of each battery cell matches each other.

[0170] Specifically, in an embodiment of the present application, the vehicle can adjust the duty cycle of the upper bridge tube and the duty cycle of the lower bridge tube when the difference in the current remaining capacity of one battery cell relative to another battery cell is greater than or equal to a first preset threshold, thereby changing the operating status of each battery cell.

[0171] In an example, please participate Figure 2 , for Figure 2 The battery cell in the upper middle position (let the battery pack be C1), Figure 2 For the battery cell in the lower middle position (C2), when the duty cycle of the upper bridge transistor increases and the duty cycle of the lower bridge transistor decreases, the operating current of C1 increases and the operating current of C2 decreases. When the duty cycle of the upper bridge transistor decreases and the duty cycle of the lower bridge transistor increases, the operating current of C1 decreases and the operating current of C2 increases.

[0172] In this way, in the embodiment of the present application, when the current remaining capacity difference is greater than or equal to the first preset threshold value, the opening and closing states of the upper bridge tube and the lower bridge tube can be controlled to control the operating state of each battery cell, so that the remaining capacity of each battery cell matches each other, so that the operating state of the battery cell can be adjusted based on the opening and closing states of the upper bridge tube and the lower bridge tube.

[0173] In certain embodiments of the present application, the operating state includes an operating current, the plurality of battery cells include a first battery cell and a second battery cell, the operating current of the first battery cell is positively correlated with the duty cycle of the upper bridge transistor, and the operating current of the second battery cell is positively correlated with the duty cycle of the lower bridge transistor. When a current remaining capacity difference is greater than or equal to a first preset threshold, the duty cycle of the upper bridge transistor and the duty cycle of the lower bridge transistor are controlled to control the operating state of each battery cell so that the remaining capacity of each battery cell matches each other, including:

[0174] When the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold and the current remaining capacity difference is greater than zero, the duty cycle of the upper bridge transistor is controlled to decrease, and the duty cycle of the lower bridge transistor is controlled to increase; and / or,

[0175] When the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold and the current remaining capacity difference is less than zero, the duty cycle of the upper bridge tube is controlled to increase, and the duty cycle of the lower bridge tube is controlled to decrease.

[0176] The processor of the embodiment of the present application is also used to control the duty cycle of the upper bridge tube to decrease and the duty cycle of the lower bridge tube to increase when the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold value and the current remaining capacity difference is greater than zero; and / or, to control the duty cycle of the upper bridge tube to increase and the duty cycle of the lower bridge tube to decrease when the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold value and the current remaining capacity difference is less than zero.

[0177] Specifically, in an embodiment of the present application, when it is determined that the SOC of one battery cell is higher than the SOC of another battery cell, and the difference in the SOCs of the two battery cells is greater than or equal to a first preset threshold, the duty cycle of the bridge tube on one battery cell side can be reduced and the duty cycle of the bridge tube on the other battery cell side can be reduced.

[0178] For example, please participate Figure 2 , for Figure 2 The battery cell in the upper middle position (let the battery pack be the first battery cell), Figure 2 For the battery cell in the lower middle position (let's call this the second battery cell in this battery pack), when the SOC of the first battery cell is higher than the SOC of the second battery cell, and the absolute value of the difference in the current remaining capacity of the first battery cell relative to the second battery cell is greater than or equal to a first preset threshold, the duty cycle of each upper bridge transistor can be reduced, and the duty cycle of each lower transistor can be increased, so as to reduce the operating current of the first battery cell and increase the operating current of the second battery cell. Consequently, over time, the SOC of the first battery cell will gradually approach the SOC of the second battery cell, which is equivalent to the first battery cell supplying power to the second battery cell to charge the second battery cell.

[0179] Conversely, when the SOC of the first battery cell is lower than the SOC of the second battery cell, and the absolute value of the difference in the current remaining capacity of the first battery cell relative to the second battery cell is greater than or equal to a first preset threshold, the duty cycle of each upper bridge transistor can be increased, and the duty cycle of each lower bridge transistor can be reduced, so that the operating current of the first battery cell increases and the operating current of the second battery cell decreases. Consequently, over time, the SOC of the second battery cell will gradually approach the SOC of the first battery cell, which is equivalent to the second battery cell supplying power to the first battery cell to charge the first battery cell.

[0180] Thus, in an embodiment of the present application, when the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold value, and the current remaining capacity difference is greater than zero, the duty cycle of the upper bridge tube can be controlled to decrease, and the duty cycle of the lower bridge tube can be controlled to increase; and / or, when the absolute value of the current remaining capacity difference is greater than or equal to the first preset threshold value, and the current remaining capacity difference is less than zero, the duty cycle of the upper bridge tube can be controlled to increase, and the duty cycle of the lower bridge tube can be controlled to decrease, thereby realizing duty cycle control for the upper bridge tube and the lower bridge tube.

[0181] In certain embodiments of the present application, the battery control method further includes:

[0182] When the current remaining capacity difference is less than the second preset threshold and a preset stop operation instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube, so that the battery module stops generating heat.

[0183] The processor of the embodiment of the present application is also used to control the duty cycle of the upper bridge tube to be the same as the duty cycle of the lower bridge tube when the current remaining capacity difference is less than a second preset threshold and a preset stop working instruction is obtained, so as to stop the battery module from generating heat.

[0184] Specifically, in an embodiment of the present application, when it is determined that the current remaining capacity difference between a battery cell and another battery cell is less than a second preset threshold value, the duty cycle of the upper bridge tube and the duty cycle of the lower bridge tube can be controlled to be the same, so that each battery cell in the battery module stops discharging and thus stops generating heat.

[0185] In one example, the second preset threshold is lower than the first preset threshold.

[0186] In one example, the preset stop operation instruction is used to instruct the battery module to stop self-heating.

[0187] Thus, in the embodiment of the present application, when the current remaining capacity difference is less than the second preset threshold value and the preset stop working instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube, thereby completing

[0188] In certain embodiments of the present application, the battery control method further includes:

[0189] When the current remaining capacity difference is greater than the third preset threshold and a preset stop operation instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube to stop the battery module from generating heat, and the current remaining capacity difference is stored.

[0190] The processor of the embodiment of the present application is also used to control the duty cycle of the upper bridge tube to be the same as the duty cycle of the lower bridge tube when the current remaining capacity difference is greater than a third preset threshold and a preset stop work instruction is obtained, so as to stop the battery module from generating heat and store the current remaining capacity difference.

[0191] Specifically, in the embodiments of the present application, if the vehicle determines that the SOC of one battery cell is significantly different from the SOC of another battery cell, but receives a preset stop command, it can control the duty cycle of the upper and lower bridge transistors to be the same, so that each battery cell in the battery module stops discharging and thus stops generating heat. At the same time, the vehicle can also store the current remaining capacity difference and, during the next self-heating or charging operation, adjust the duty cycle of each upper and lower bridge transistor based on the stored current remaining capacity difference to achieve a balanced SOC of each battery cell.

[0192] Thus, in the embodiment of the present application, when the current remaining capacity difference is greater than the third preset threshold value and the preset stop working instruction is obtained, the duty cycle of the upper bridge tube can be controlled to be the same as the duty cycle of the lower bridge tube, so that the battery module stops generating heat, and the current remaining capacity difference is stored, so that the operating state of the battery unit can be controlled according to the stored current remaining capacity difference.

[0193] In certain embodiments of this application, please refer to Figure 2 、 Figure 7 As well as C1 and C2 mentioned above, Figure 7 The figure is a flow chart of a battery control method in certain embodiments of the present application. Specifically, in the embodiments of the present application, the BMS in the vehicle can determine whether the battery module meets self-heating conditions, such as whether the insulation state is normal, whether there is a short circuit, open circuit, or leakage, based on the real-time detected battery module temperature and when the battery module temperature is less than a preset temperature, such as 10 degrees Celsius. If so, the BMS sends a self-heating command and simultaneously closes the third switch device.

[0194] Then, when the ECU (i.e., control module) receives the self-heating instruction, it controls the upper and lower bridge tubes to alternately close and open within a certain period of time according to the pre-set self-heating operating frequency and operating current, so that the battery module can self-heat.

[0195] Then, during the self-heating process of the battery module, the intensity B of the magnetic field generated by the detection group surrounding the positive conductor (or positive busbar) arranged on the magnetic ring along the first direction is + , and the intensity B of the magnetic field generated by the detection group along the second direction around the negative conductor (or negative busbar) set on the magnetic ring - . And according to B + and B -Calculate the current difference ΔI.

[0196] Then, according to the pre-set -α and +α thresholds that represent the maximum SOC deviation during the entire self-heating process, ΔI is integrated over time to determine the SOC deviation (i.e., the current SOC difference), and the relationship between the SOC deviation and -α and +α is continuously judged.

[0197] Then, if the current SOC difference is ≥+α, the duty cycle of each switch tube on the C1 side is reduced and the duty cycle of each switch tube on the C2 side is increased, that is, the duty cycle of each upper bridge tube is controlled to decrease, and the duty cycle of each lower bridge tube is controlled to increase.

[0198] Afterwards, if the current SOC difference is less than β, the duty cycle of the upper bridge tube is adjusted to be the same as the duty cycle of the lower bridge tube, thereby exiting the self-heating of the control module.

[0199] Afterwards, if it is detected that self-heating is completed, but the current SOC difference is ≥ |α|, the current SOC difference is stored in the register of the BMS to be used after the next self-heating is turned on.

[0200] An embodiment of the present application further provides a vehicle, which includes the above-mentioned electronic device.

[0201] The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by one or more processors, the above-mentioned battery control method is implemented.

[0202] The embodiment of the present application further provides a computer program product, including a computer program / instruction, which implements the above-mentioned battery control method when executed by a processor.

[0203] In the description of this specification, the descriptions with reference to the terms "particularly", "further", "particularly", "understandably", etc. are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms are not intended to refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0204] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0205] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery control device, characterized in that: The battery module comprises a control module and a battery module, wherein the battery module comprises a plurality of battery cells, and the control module is electrically connected to the battery module; The control module is configured to control the operating state of each of the battery cells according to the magnetic field properties of the battery module so that the remaining capacities of the battery cells match each other.

2. The device according to claim 1, characterized in that The device includes a detection device for detecting the properties of the magnetic field, and the control module is electrically connected to the detection device.

3. The device according to claim 2, characterized in that The detection device includes a magnetic ring, the positive pole wire of the battery module is arranged around one side of the magnetic ring along a first direction, and the negative pole wire of the battery module is arranged around the other side of the magnetic ring along a second direction, and the first direction is opposite to the second direction.

4. The device according to claim 1, characterized in that The device includes a resistor arranged in series with one of the battery cells.

5. The device according to claim 1, characterized in that The device includes a first switching device, the battery module is connected to the first switching device, the first switching device is connected to the control module, and the open and closed state of the first switching device is related to the operating state of the battery unit.

6. The device according to claim 5, characterized in that The first switching device includes a capacitor, at least one bridge arm and at least one inductor. Each bridge arm includes an upper bridge tube and a lower bridge tube arranged in series. The connection node between the upper bridge tube and the lower bridge tube is connected to one of the inductors. The capacitor is arranged in parallel with the bridge arm.

7. The device according to claim 1, characterized in that The device includes a second switching device, the battery module is electrically connected to the second switching device, the second switching device is connected to the control module, the battery module can generate heat when the second switching device is in a closed state, and the battery module cannot generate heat when the second switching device is in an open state.

8. A battery control method, characterized in that: The method is applied to the device according to any one of claims 1 to 7, and the method comprises: The operating state of each of the battery cells is controlled according to the magnetic field properties of the battery module so that the remaining capacities of the battery cells match each other.

9. The method according to claim 8, characterized in that The controlling the operating state of each of the battery cells according to the magnetic field properties of the battery module so that the remaining capacities of the battery cells match each other includes: When the temperature of the battery module is less than or equal to a preset temperature, the operating state of each of the battery cells is controlled according to the magnetic field properties.

10. The method according to claim 9, characterized in that The device includes a second switch device, wherein the battery module can generate heat when the second switch device is in a closed state, and cannot generate heat when the second switch device is in an open state. When the temperature of the battery module is less than or equal to a preset temperature, controlling the operating state of each battery cell according to the magnetic field property includes: When the temperature of the battery module is less than or equal to the preset temperature, the second switching device is controlled to be in a closed state, and the operating state of each of the battery cells is controlled according to the magnetic field properties.

11. The method according to claim 8, characterized in that The apparatus includes a first switching device, the battery module is connected to the first switching device, each bridge arm of the first switching device includes an upper bridge tube and a lower bridge tube arranged in series, and the operating state of each battery cell is controlled according to the magnetic field properties of the battery module so that the remaining capacity of each battery cell matches each other, including: The operating state of each of the battery cells is determined based on the magnetic field properties when the first switching device is in a first preset state and the magnetic field properties when the first switching device is in a second preset state, so that the remaining capacity of each of the battery cells matches each other, wherein, when the first switching device is in the first preset state, the upper bridge tube is in a closed state and the lower bridge tube is in a disconnected state; when the first switching device is in the second preset state, the upper bridge tube is in a disconnected state and the lower bridge tube is in a closed state.

12. The method according to claim 11, characterized in that The magnetic field attribute includes magnetic field strength, and determining the operating state of each of the battery cells based on the magnetic field attribute when the first switching device is in a first preset state and the magnetic field attribute when the first switching device is in a second preset state so that the remaining capacity of each of the battery cells matches each other includes: determining a current difference between a current operating current of a battery cell and a current operating current of another battery cell based on a magnetic field strength when the first switching device is in a first preset state and a magnetic field strength when the first switching device is in a second preset state; The operating state of each of the battery cells is determined according to the current difference.

13. The method according to claim 12, characterized in that Determining the operating state of each battery cell according to the current difference includes: Determining a current remaining capacity difference between one battery cell and another battery cell according to the current operating current difference and the continuous operation duration of the battery module; The operating state of each of the battery cells is controlled according to the current residual capacity difference.

14. The method according to claim 13, characterized in that The controlling the operating state of each battery cell according to the current remaining capacity difference includes: When the current remaining capacity difference is greater than or equal to a first preset threshold, the duty cycle of the upper bridge tube and the duty cycle of the lower bridge tube are controlled to control the operating state of each of the battery cells so that the remaining capacity of each of the battery cells matches each other.

15. The method according to claim 14, characterized in that The operating state includes an operating current, the multiple battery cells include a first battery cell and a second battery cell, the operating current of the first battery cell is positively correlated with the duty cycle of the upper bridge tube, and the operating current of the second battery cell is positively correlated with the duty cycle of the lower bridge tube, and when the current remaining capacity difference is greater than or equal to a first preset threshold, controlling the duty cycle of the upper bridge tube and the duty cycle of the lower bridge tube to control the operating state of each of the battery cells so that the remaining capacity of each of the battery cells matches each other, including: When the absolute value of the current remaining capacity difference is greater than or equal to a first preset threshold value and the current remaining capacity difference is greater than zero, controlling the duty cycle of the upper bridge transistor to decrease and controlling the duty cycle of the lower bridge transistor to increase; and / or, When the absolute value of the current remaining capacity difference is greater than or equal to a first preset threshold and the current remaining capacity difference is less than zero, the duty cycle of the upper bridge tube is controlled to increase, and the duty cycle of the lower bridge tube is controlled to decrease.

16. The method according to claim 13, characterized in that The method further comprises: When the current remaining capacity difference is less than a second preset threshold and a preset stop operation instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube, so that the battery module stops generating heat.

17. The method according to claim 13, wherein The method further comprises: When the current remaining capacity difference is greater than a third preset threshold and a preset stop-work instruction is obtained, the duty cycle of the upper bridge tube is controlled to be the same as the duty cycle of the lower bridge tube so that the battery module stops generating heat, and the current remaining capacity difference is stored.

18. An electronic device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method according to any one of claims 8 to 17 is implemented.

19. A vehicle, characterized in that: The vehicle comprises the apparatus according to any one of claims 1 to 7 and the device according to claim 18.

20. 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 one or more processors, the method according to any one of claims 8 to 17 is implemented.

21. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the method according to any one of claims 8 to 17 is implemented.

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