Battery control method and device, battery management system and storage medium

Abstract

The application relates to a battery control method and device, a battery management system, a storage medium and a computer program product. In the case that overcurrent occurs in a target battery, first, a switch device on the power receiving side of two back-to-back connected switch devices is turned on, and a switch device on the power supply side is operated in a heating mode. Then, in the case that the overcurrent operation of the target battery meets preset shutdown conditions, the two switch devices are simultaneously turned off. In the above scheme, when overcurrent occurs, instead of directly turning off the switch devices, one of the switch devices is continuously turned on, and the other switch device is controlled to operate in a heating mode. The surge energy is absorbed through heating and dissipated in the packaging structure of the switch device until the preset shutdown conditions are met, the two switch devices are turned off, soft shutdown control of the switch devices is realized, the influence of the induced electromotive force generated by the parasitic inductance on the switch devices is slowed down, and the switch devices are prevented from being broken down.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery control method, device, battery management system, storage medium, and computer program product. Background Technology

[0002] With the rapid development of new energy technologies, power batteries are widely used in electric vehicles, smart electronic products, and other electrical equipment due to their advantages of being environmentally friendly and having a long service life. Power batteries are generally equipped with a Battery Management System (BMS) to manage and monitor charging and discharging, and to cut off the power battery to protect it in the event of overvoltage, undervoltage, or overcurrent.

[0003] However, when the BMS turns off the protection switching device, the parasitic inductance of the power supply network or the DC-DC converter (DCDC) output circuit will cause a high induced electromotive force on both sides of the protection switching device, which will break down the protection switching device. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery control method, device, battery management system, and storage medium to mitigate the phenomenon of protection switching devices being damaged when overcurrent occurs in a power battery.

[0005] In a first aspect, this application provides a battery control method, comprising: controlling a switching device on the power supply side to operate in a heating mode and controlling a switching device on the power receiving side to conduct when an overcurrent occurs in the target battery; wherein the two switching devices are connected back to back and are respectively used to connect the target battery and a load device; and controlling the two switching devices to turn off when the overcurrent operation of the target battery meets a preset shutdown condition.

[0006] In the aforementioned battery control method, when an overcurrent occurs in the target battery, the energized switch is first turned on, while the power supply switch operates in a heating mode. Then, when the overcurrent operation of the target battery meets a preset shutdown condition, both switches are simultaneously turned off. This scheme, in the event of an overcurrent, does not directly disconnect the switches but instead keeps one switch on while controlling the other to operate in a heating mode. The heating absorbs surge energy, dissipating it within the switch's encapsulation structure until the preset shutdown condition is met, at which point both switches are turned off. This achieves soft shutdown control of the switches, thereby mitigating the impact of the induced electromotive force generated by parasitic inductance on the switches and preventing them from being damaged.

[0007] In some embodiments, before controlling the switching device on the power supply side to operate in a heating mode and controlling the switching device on the power receiving side to turn on when the target battery experiences an overcurrent, the method further includes: acquiring the operating current parameters of the target battery; and determining that the target battery has experienced an overcurrent when the operating current parameters are greater than or equal to a preset overcurrent threshold.

[0008] The above scheme determines whether the target battery has experienced overcurrent by comparing the real-time operating current parameters of the target battery with a preset overcurrent threshold, and has the advantages of high detection efficiency and high detection accuracy.

[0009] In some embodiments, controlling the switching device on the power supply side to operate in a heating mode includes: controlling the switching device on the power supply side to operate in the linear region, and maintaining the voltage between the input terminal and the output terminal of the switching device on the power supply side less than a preset breakdown threshold voltage.

[0010] The above solution controls the switching device to operate in the linear region and maintains the voltage between the input and output terminals below the preset breakdown threshold voltage, thereby enabling the switching device to operate in a heat-generating mode. This not only allows for rapid absorption of surge energy but also ensures the safe operation of the switching device.

[0011] In some embodiments, controlling the switching devices on the power supply side to operate in a heating mode and controlling the switching devices on the power receiving side to turn on when an overcurrent occurs in the target battery includes: determining the overcurrent type of the target battery when an overcurrent occurs; and controlling the switching devices on the power supply side to operate in a heating mode and controlling the switching devices on the power receiving side to turn on according to the overcurrent type.

[0012] The above solution requires determining the type of overcurrent when the target battery experiences an overcurrent, and then controlling the operating state of the switching devices based on the overcurrent type to ensure the safe and stable operation of the two switching devices, thereby effectively improving the reliability of the battery management system.

[0013] In some embodiments, the overcurrent type includes charging overcurrent; the step of controlling the switching device on the power supply side to operate in a heating mode and controlling the switching device on the power receiving side to conduct according to the overcurrent type includes: in the event of charging overcurrent, controlling the switching device connected to the load device to operate in a heating mode and controlling the switching device connected to the target battery to conduct.

[0014] The above solution controls the switching devices connected to the load device to operate in a heating mode when an overcurrent occurs during charging, i.e., when an overcurrent occurs while charging the target battery. This prevents the switching devices from being damaged in this operating mode and ensures the reliability of the switching devices under overcurrent conditions.

[0015] In some embodiments, the overcurrent type includes discharge overcurrent; the step of controlling the switching device on the power supply side to operate in a heating mode and controlling the switching device on the power receiving side to conduct according to the overcurrent type includes: in the event of discharge overcurrent, controlling the switching device connected to the target battery to operate in a heating mode and controlling the switching device connected to the load device to conduct.

[0016] The above solution controls the switching devices connected to the target battery to operate in a heating mode when an overcurrent discharge occurs, i.e., when the target battery discharges to the load device. This prevents the switching devices from being damaged in this operating mode and ensures the reliability of the switching devices under the overcurrent discharge condition.

[0017] In some embodiments, controlling the two switching devices to turn off when the target battery overcurrent operation meets the preset shutdown conditions includes: controlling the two switching devices to turn off when the duration of the target battery overcurrent operation reaches the preset duration.

[0018] The above scheme determines whether the preset shutdown condition is met by analyzing whether the overcurrent runtime has reached the preset duration, which has the advantage of high analysis efficiency.

[0019] In some embodiments, controlling the two switching devices to turn off when the target battery overcurrent operation meets the preset shutdown conditions includes: controlling the two switching devices to turn off when the voltage between the end of the two switching devices connected to the target battery and the end connected to the load device is less than a preset voltage threshold.

[0020] The above scheme determines whether the preset shutdown condition is met by analyzing whether the voltage between the end of the two switching devices connected to the target battery and the end connected to the load device is less than a preset voltage threshold. It has the advantage of high analysis accuracy.

[0021] Secondly, this application provides a battery control device, comprising: an operation control module, used to control the switching device on the power supply side to operate in a heating mode and control the switching device on the power receiving side to conduct when the target battery experiences overcurrent; wherein the two switching devices are connected back to back and are respectively used to connect the target battery and the load device; and a shutdown control module, used to control the two switching devices to shut down when the target battery's overcurrent operation meets a preset shutdown condition.

[0022] Thirdly, a battery management system includes: a switching device, a current detection device, and a control device, wherein two switching devices are connected back-to-back and are used to connect to a target battery and a load device; the current detection device is connected to the target battery and the load device respectively; and the control device is connected to the switching device, the current detection device, the target battery, and the load device respectively.

[0023] In some embodiments, the control device includes a monitoring processor and a controller, wherein the switching device, the current detection device and the target battery are respectively connected to the monitoring processor, the monitoring processor is connected to the controller, and the controller is communicatively connected to the load device.

[0024] The above scheme includes a monitoring processor and a controller, which respectively implement different data processing functions, effectively reducing data processing pressure and ensuring the operational reliability of the control device.

[0025] In some embodiments, the control device further includes a communicator, through which the controller communicates with the load device.

[0026] In the above scheme, the main control device communicates with the load device through a communicator, thereby realizing information interaction between the main control device and the load device, so that the operation of the battery management system is linked to the load device, ensuring the reliability of the battery management system.

[0027] In some embodiments, the switching device includes a first switching device and a second switching device. The drain terminal of the first switching device is used to connect to the target battery. The source terminal of the first switching device is connected to the source terminal of the second switching device. The drain terminal of the second switching device is connected to the load device. The source terminal of the first switching device, the source terminal of the second switching device, the gate terminal of the first switching device, and the gate terminal of the second switching device are respectively connected to the control device.

[0028] The above scheme includes a first switching device and a second switching device, and the two switching devices are connected back to back through the source end to realize the on / off control between the load device and the target battery, and ensure the safe operation of the battery management system.

[0029] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described battery control method.

[0030] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described battery control method. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 These are schematic diagrams illustrating the application scenarios of power batteries in some embodiments of this application;

[0033] Figure 2 This is a schematic diagram illustrating the application scenarios of the battery control method in some embodiments of this application;

[0034] Figure 3 This is a schematic flowchart of the battery control method in some embodiments of this application;

[0035] Figure 4 This is a schematic flowchart of the battery control method in some other embodiments of this application;

[0036] Figure 5 This is a schematic flowchart of the battery control method in some embodiments of this application;

[0037] Figure 6 This is a schematic diagram of the battery control method in some embodiments of this application;

[0038] Figure 7 This is a schematic flowchart of the battery control method in some other embodiments of this application;

[0039] Figure 8 This is a schematic flowchart of the battery control method in some embodiments of this application;

[0040] Figure 9 This is a schematic diagram of the battery control method in some embodiments of this application;

[0041] Figure 10 This is a flowchart of the battery control method in some embodiments of this application;

[0042] Figure 11 This is a schematic diagram of the battery control device structure in some embodiments of this application;

[0043] Figure 12 This is a schematic diagram of the battery control device structure in some other embodiments of this application;

[0044] Figure 13 This is a schematic diagram of the battery management system structure in some embodiments of this application. Detailed Implementation

[0045] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0046] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0051] To ensure the safe and stable operation of power batteries during charging / discharging or in dormant mode, a battery management system (BMS) is often installed to monitor parameters such as charging / discharging current, voltage, and temperature of the battery cells (battery packs). When overcurrent, overvoltage, or undervoltage conditions are detected, a protective switch located between the battery cell and the load device in the BMS is typically activated to disconnect the connection and prevent damage. However, due to parasitic inductance in low-voltage power grids or DC-DC output circuits, the presence of this parasitic inductance can cause a very high induced electromotive force across the protective switch when it is deactivated in such situations, ultimately leading to the switch's breakdown.

[0052] To address the issue of breakdown of protective switching devices due to induced electromotive force (EMF) during turn-off, a control method can be implemented for their turn-off. Specifically, the protective switching devices are configured with a back-to-back connection. Upon detecting an overcurrent, a soft turn-off is employed. The protective switching devices operate in a heating mode to absorb the surge voltage generated by the induced EMF, dissipating it within the device's package structure. This continues until the set turn-off conditions are met, at which point both devices are turned off, thus preventing the induced EMF from affecting the protective switching devices.

[0053] Based on the above considerations, the technical solution of this application embodiment provides a battery control method. During the operation of the power battery, the operating current parameters of the power battery are detected in real time. If, based on the analysis of the operating current parameters, it is determined that the power battery has experienced overcurrent, the method controls one of the two back-to-back connected switching devices to operate in a heating mode, while the other is turned on, and this state is maintained for a period of time. Specifically, the switching device on the power supply side can be controlled to operate in the linear region, and the voltage between the input and output terminals of the switching device can be maintained below a preset breakdown threshold voltage. Finally, when the preset shutdown conditions are met, both switching devices are turned off, disconnecting the power battery from the load device.

[0054] In the above manner, in the event of overcurrent, the surge energy is absorbed by heating through the characteristic of the switching device’s own turn-on impedance changing the gate-source voltage. The surge energy generated by the induced electromotive force is dissipated in the package structure of the switching device, eliminating the need for additional devices to absorb surge energy. Furthermore, it ensures that the control follower voltage does not exceed the breakdown voltage, thereby improving the operational reliability of the battery management system.

[0055] The target battery referred to in this application embodiment is the cell, battery pack, or battery module in a power battery used to store or release electrical energy. The target battery can be used, but is not limited to, in electrical devices such as mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] For ease of explanation, the following embodiments use the application of a power battery in a vehicle as an example in one embodiment of this application for illustration. Figure 1 This is a schematic diagram of the structure of a vehicle 10 provided in some embodiments of this application. The vehicle 10 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A power battery 100 is installed inside the vehicle 10, and the power battery 100 can be located at the bottom, front, or rear of the vehicle 10. The power battery 100 can be used to supply power to the vehicle 10. For example, the power battery 100 can serve as the operating power source for the vehicle 10, and can also serve as the driving power source for the vehicle 10, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 10. The vehicle 10 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 10 during starting, navigation, and driving.

[0057] The battery control method provided in this application embodiment is applied to... Figure 2 The battery management system shown includes a switching device M, a current detection device 21, and a control device 22. Two switching devices M are connected back to back and are used to connect the target battery (i.e., cells 1-4 in the figure) and the load device (not shown). The current detection device 21 is connected to the target battery and the load device respectively. The control device 22 is connected to the switching device M, the current detection device 21, the target battery, and the load device respectively. The current detection device 21 is used to collect the operating current parameters of the target battery during operation and send them to the control device 22. The control device 22 is used to execute the battery control method.

[0058] Please see Figure 3 The battery control method is explained using the application of a battery control device. The battery control method includes steps 302 and 304.

[0059] Step 302: In the event of an overcurrent in the target battery, control the switching devices on the power supply side to operate in a heating mode, and control the switching devices on the power receiving side to conduct.

[0060] Specifically, two switching devices are connected back-to-back and are used to connect to the target battery and the load device, respectively. The load device is the device connected to the battery management system of the power battery. The target battery is the cell, battery pack, or battery module of the power battery that needs to be controlled by the scheme of this application embodiment. The power supply side is the side that is close to and connected to the device that provides electrical energy; the power receiving side is the side that is close to and connected to the device that receives electrical energy. The heating mode is the operating mode in which the switching devices exhibit resistive characteristics and generate heat based on the flowing electrical energy.

[0061] The type of target battery is not unique; it can be a single cell or a battery pack (or battery stack) formed by connecting two or more cells in series or parallel. In a more detailed embodiment, the target battery includes a 12V lithium battery.

[0062] The battery management system's control device has an overcurrent monitoring function. During the operation of the target battery, it can monitor the operating current parameters of the target battery in real time to analyze whether an overcurrent has occurred. If an overcurrent is detected, the power supply-side switching device is controlled to operate in a heating mode, and the power-receiving-side switching device is controlled to turn on. The heat generated by the power-receiving-side switching device converts the induced electromotive force generated in the battery management system into heat energy, which is ultimately dissipated in the packaging structure of the switching device. This prevents the induced electromotive force from affecting the switching device during the subsequent turn-off process.

[0063] It should be noted that the specific type of control device is not unique. In one embodiment, the control device includes a monitoring processor and a controller. The monitoring processor has voltage, current and temperature monitoring functions, while the controller is the main control device of the battery management system, responsible for the information interaction between the battery management system and the load device, thereby realizing the charging and discharging control of the target battery.

[0064] It is understood that the specific type of monitoring processor is not unique. In one embodiment, the monitoring processor can be a processor, which internally implements functions such as acquiring operating parameters (voltage, current, and temperature, etc.), parameter analysis, overcurrent monitoring, overvoltage monitoring, and overtemperature monitoring to achieve the battery control method of this application embodiment. In another embodiment, the monitoring processor can also be built through hardware circuitry, integrating parameter sampling circuitry, comparison circuitry, power metering circuitry, temperature monitoring circuitry, and voltage and current monitoring circuitry, which can also achieve the battery control method of this application embodiment. Furthermore, in one embodiment, the monitoring processor can also be built through a combination of hardware circuitry and a processor, without specific limitations.

[0065] In a more detailed embodiment, the monitoring processor includes an ASIC (Application Specific Integrated Circuit), which is internally constructed through software and / or hardware to form a device with functions such as parameter acquisition, parameter analysis, overcurrent monitoring, overvoltage monitoring, and overtemperature monitoring.

[0066] The specific type of controller is not unique. In one embodiment, it may include an MCU (Microcontroller Unit). In other embodiments, the controller may also include devices with data processing capabilities such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), without any specific limitation.

[0067] Depending on the application scenario of the power battery, the specific type of load device will also vary. Load device can include an electrical device that operates under the drive of the target battery's output power, and can also include a charging device that converts and transmits electrical energy from an external power source to charge the target battery. For example, in a more detailed embodiment, the load device can be an electric vehicle, which includes electrical devices such as a motor, and charging devices such as an on-board charger that uses an external power source to charge the target battery. To facilitate understanding of the technical solution of this application, the following explanation will use the example of a load device including both an electrical device and a charging device.

[0068] During operation, the target battery can operate in charging and discharging modes according to actual working needs. In charging mode, the load device provides electrical energy, meaning the load device is connected to an external power source. The charging device of the load device converts and transfers the electrical energy from the external power source to charge the target battery. Accordingly, in this mode, the load device is the energy provider, and the target battery is the energy receiver. Therefore, in this mode, the switching device located near and connected to the load device acts as the power supply side, and the switching device located near and connected to the target battery acts as the power receiving side.

[0069] When the target battery operates in discharge mode, the electrical energy released by the target battery is transferred to the load device to power the load device. Accordingly, in this mode, the target battery is the device that provides electrical energy, and the load device is the device that receives electrical energy. Therefore, in this mode, the switching device that is close to and connected to the load device is the switching device on the receiving side, and the switching device that is close to and connected to the target battery is the switching device on the supply side.

[0070] It should be noted that the specific type of switching device is not unique; it can be a transistor, a field-effect transistor, etc., and is not specifically limited. In a more detailed embodiment, all switching devices are field-effect transistors, with the source terminal of the first switching device connected to the source terminal of the second switching device, the drain terminals of the two switching devices connected to the load device and the target battery respectively, and the gate and far-end terminals of the two switching devices connected to the control device respectively. For ease of understanding of the technical solution of this application, the switching devices in the following embodiments can all be understood as field-effect transistors.

[0071] Step 304: When the target battery is operating under overcurrent conditions and the preset shutdown conditions are met, control the two switching devices to turn off.

[0072] Specifically, the preset shutdown condition is a pre-defined condition that must be met to simultaneously shut down both switching devices. When the control device controls the power supply-side switching device to operate in heating mode and controls the energized-side switching device to be on, the control device further analyzes whether the current operation of the battery management system meets the preset shutdown condition, that is, whether the target battery's overcurrent operation meets the preset shutdown condition. Based on meeting the preset shutdown condition, the control device shuts down both switching devices, completing the overcurrent protection.

[0073] In the aforementioned battery control method, when an overcurrent occurs in the target battery, the energized switch is first turned on, while the power supply switch operates in a heating mode. Then, when the overcurrent operation of the target battery meets a preset shutdown condition, both switches are simultaneously turned off. This scheme, in the event of an overcurrent, does not directly disconnect the switches but instead keeps one switch on while controlling the other to operate in a heating mode. The heating absorbs surge energy, dissipating it within the switch's encapsulation structure until the preset shutdown condition is met, at which point both switches are turned off. This achieves soft shutdown control of the switches, thereby mitigating the impact of the induced electromotive force generated by parasitic inductance on the switches and preventing them from being damaged.

[0074] Please see Figure 4 In some embodiments, the method further includes steps 402 and 404 before step 302.

[0075] Step 402: Obtain the operating current parameters of the target battery.

[0076] Step 404: If the operating current parameter is greater than or equal to the preset overcurrent threshold, it is determined that the target battery has experienced overcurrent.

[0077] Specifically, the preset overcurrent threshold is a preset current parameter of the target battery when an overcurrent occurs. In this embodiment, the preset overcurrent threshold is pre-stored in the control device. During the operation of the target battery, the real-time acquired operating current parameter is compared and analyzed with the preset overcurrent threshold to determine whether the target battery has experienced an overcurrent in the current state.

[0078] It is understood that the control device may acquire the operating current parameters of the target battery in a variety of ways. In a more detailed embodiment, the battery management system is equipped with a current detection device, which can collect the current parameters of the target battery during charging and discharging in real time and send them to the control device.

[0079] It should be noted that the specific type of current detection device is not unique; any device with current detection function is acceptable. For example, in one embodiment, the current parameter device includes any one of a shunt or a current sensor.

[0080] The above scheme determines whether the target battery has experienced overcurrent by comparing the real-time operating current parameters of the target battery with a preset overcurrent threshold, and has the advantages of high detection efficiency and high detection accuracy.

[0081] There is no single way to control the switching devices on the power supply side to operate in a heat-generating mode. The actual control method will vary depending on the type of switching device. As long as the induced electromotive force generated by the battery management system can be converted into heat energy by the switching devices and dissipated in the packaging structure of the switching devices when operating in heat-generating mode, it is acceptable.

[0082] For example, in some embodiments, controlling the switching device on the power supply side to operate in a heating mode includes: controlling the switching device on the power supply side to operate in the linear region and maintaining the voltage between the input and output terminals of the switching device on the power supply side below a preset breakdown threshold voltage.

[0083] Specifically, the preset breakdown threshold voltage is a preset voltage level required for the drain-source breakdown of the switching device. The method by which the control device controls the voltage between the input and output terminals of the switching device on the power supply side to be less than the preset breakdown threshold voltage is not unique. In one embodiment, the control device may achieve this by adjusting the voltage output to the input and / or output terminals of the switching device on the power supply side; no specific limitation is made.

[0084] The magnitude of the preset breakdown threshold voltage is not unique. In one embodiment, the drain-source breakdown voltage of the switching device can be used as the preset breakdown threshold voltage and stored in the control device. During subsequent control, the drain-source breakdown voltage is used as the preset breakdown threshold voltage and compared and analyzed with the voltage between the input and output terminals of the switching device on the power supply side.

[0085] In another embodiment, to ensure the operational reliability of the switching device, the preset breakdown threshold voltage can be set to be less than the drain-source breakdown voltage of the switching device. For example, the preset breakdown threshold voltage can be set to a certain multiple (less than 1) of the drain-source breakdown voltage. More specifically, in one embodiment, the preset breakdown threshold voltage can be set to 75% of the drain-source breakdown voltage.

[0086] The above solution controls the switching device to operate in the linear region and maintains the voltage between the input and output terminals below the preset breakdown threshold voltage, thereby enabling the switching device to operate in a heat-generating mode. This not only allows for rapid absorption of surge energy but also ensures the safe operation of the switching device.

[0087] To facilitate understanding of the technical solutions of this application, the following embodiments are explained by controlling the switching device to operate in a heating mode, including controlling the switching device on the power supply side to operate in the linear region, and maintaining the voltage between the input and output terminals of the switching device on the power supply side less than a preset breakdown threshold voltage.

[0088] Please see Figure 5 In some embodiments, step 302 includes steps 502 and 504.

[0089] Step 502: In the event of an overcurrent in the target battery, determine the type of overcurrent in the target battery.

[0090] Step 504: Based on the overcurrent type, control the switching devices on the power supply side to operate in heating mode, and control the switching devices on the energized side to conduct.

[0091] Specifically, the target battery can operate in either a discharge or charge mode. During actual operation, the power supply and receiving sides will differ depending on the operating mode, and consequently, the control methods for the switching devices will also vary. Therefore, in this embodiment, when an overcurrent is detected in the target battery, it is necessary to further determine the type of overcurrent, i.e., whether it is a charging overcurrent or a discharging overcurrent, to control the corresponding switching device to operate in the linear region, while another switching device operates in the on state, thereby achieving soft shutdown control under overcurrent conditions.

[0092] It should be noted that the control device can determine the overcurrent situation in a way that is not unique. In a more detailed embodiment, it can be determined by analyzing the location of the current detection device in the battery management system and the direction of current flow. There is no specific limitation; the setting can be made according to actual needs.

[0093] The above solution requires determining the type of overcurrent when the target battery experiences an overcurrent, and then controlling the operating state of the switching devices based on the overcurrent type to ensure the safe and stable operation of the two switching devices, thereby effectively improving the reliability of the battery management system.

[0094] Please see Figure 6 In some embodiments, the overcurrent type includes charging overcurrent; step 504 includes step 602.

[0095] Step 602: In the event of a charging overcurrent, control the switching device connected to the load device to operate in a heating mode, and control the switching device connected to the target battery to turn on.

[0096] Specifically, in this embodiment, the switching device is located on the positive bus of the target battery and connected to the load device. When the target battery is operating in charging mode, the electrical energy generated by the load device is transmitted to the target battery after passing through two switching devices in sequence. If an overcurrent occurs during charging, to prevent the overcurrent from flowing into the control device connected to the switching device and affecting the safe operation of the control device, it is necessary to control the switching device connected to the load device to operate in the linear region and make the voltage between its input and output terminals less than a preset breakdown threshold voltage. By utilizing the characteristic that the switching device's turn-on impedance changes with the gate-source voltage, surge energy is absorbed through heat generation and dissipated within the packaging structure of the switching device.

[0097] The above solution controls the switching devices connected to the load device to operate in a heating mode when an overcurrent occurs during charging, i.e., when an overcurrent occurs while charging the target battery. This prevents the switching devices from being damaged in this operating mode and ensures the reliability of the switching devices under overcurrent conditions.

[0098] Please see Figure 7 In some embodiments, the overcurrent type includes discharge overcurrent; step 504 includes step 702.

[0099] Step 702: In the event of a discharge overcurrent, control the switching device connected to the target battery to operate in a heating mode, and control the switching device connected to the load device to turn on.

[0100] Specifically, when the target battery is operating in discharge mode, the electrical energy of the target battery is transmitted to the load device after passing through two switching devices in sequence. If an overcurrent discharge occurs at this time, in order to prevent the overcurrent from flowing into the control device connected to the switching device and affecting the safe operation of the control device, it is necessary to control the switching device connected to the target battery to operate in the linear region and make the voltage between its input and output terminals less than the preset breakdown threshold voltage. By utilizing the characteristic that the turn-on impedance of the switching device changes with the gate-source voltage, the surge energy is absorbed by heat and dissipated in the packaging structure of the switching device.

[0101] The above solution controls the switching devices connected to the target battery to operate in a heating mode when an overcurrent discharge occurs, i.e., when the target battery discharges to the load device. This prevents the switching devices from being damaged in this operating mode and ensures the reliability of the switching devices under the overcurrent discharge condition.

[0102] Please see Figure 8 In some embodiments, step 304 includes step 802.

[0103] Step 802: When the target battery has been running under overcurrent for a preset duration, control the two switching devices to turn off.

[0104] Specifically, the preset duration is the preset overcurrent operation duration when the switching devices meet the turn-off conditions. The analysis method for determining whether the target battery's overcurrent operation meets the preset turn-off conditions is not unique. In this embodiment, when the target battery experiences overcurrent, the control device, in addition to controlling the operation of the switching devices, also starts timing. The control device then compares the timed duration with the preset duration, and if the timed duration reaches the preset duration, it simultaneously controls both switching devices to turn off.

[0105] The above scheme determines whether the preset shutdown condition is met by analyzing whether the overcurrent runtime has reached the preset duration, which has the advantage of high analysis efficiency.

[0106] Please see Figure 9 In some embodiments, step 304 includes step 902.

[0107] Step 902: If the voltage between the end of the two switching devices connected to the target battery and the end connected to the load device is less than a preset voltage threshold, control the two switching devices to turn off.

[0108] Specifically, the preset voltage threshold is the voltage between the end of the switching device connected to the target battery and the end connected to the load device when the switching device meets the turn-off condition. After the control device controls the switching device on the power supply side to operate in the linear region and maintains the voltage between the input and output terminals of the power supply side switching device below the preset breakdown threshold voltage, and controls the switching device on the power supply side to be turned on, it will continuously acquire the voltage between the end connected to the target battery and the end connected to the load device and compare it with the preset voltage threshold. If the acquired voltage is less than the preset voltage threshold, the control device considers the turn-off condition of the switching device met and will simultaneously control both switching devices to turn off.

[0109] It should be noted that the preset voltage threshold is not unique, as long as it ensures that the switching device can be safely turned off under the current voltage difference. For example, in one embodiment, the preset voltage threshold can be set to 1V, 2V, 3V, or 5V, etc., without any specific limitation.

[0110] The above scheme determines whether the preset shutdown condition is met by analyzing whether the voltage between the end of the two switching devices connected to the target battery and the end connected to the load device is less than a preset voltage threshold. It has the advantage of high analysis accuracy.

[0111] Please see Figure 10 To facilitate understanding of the technical solution of this application, the following detailed embodiments will be used to explain and illustrate this application. In the following embodiments, the monitoring processor includes an ASIC as an example.

[0112] First, the ASIC of the control device receives the operating current parameters collected by the shunt. Based on these operating current parameters and a preset overcurrent threshold, it analyzes whether an overcurrent has occurred. If an overcurrent is determined to have occurred, it further analyzes the type of overcurrent. In the event of a charging overcurrent, the ASIC starts timing, controls the switching device connected to the load device to operate in the linear region, maintains the voltage between the input and output terminals of the switching device connected to the load device below a preset breakdown threshold voltage, and controls the switching device connected to the target battery to conduct. In the event of a discharging overcurrent, the ASIC starts timing, controls the switching device connected to the target battery to operate in the linear region, maintains the voltage between the input and output terminals of the switching device connected to the target battery below a preset breakdown threshold voltage, and controls the switching device connected to the load device to conduct.

[0113] The control device collects the voltage between the end of the two switching devices connected to the target battery and the end connected to the load device in real time, and compares and analyzes the collected voltage with a preset voltage threshold. When the timer reaches the preset duration, or when the collected voltage is detected to be less than the preset voltage threshold, the ASIC completely shuts off the two switching devices, completing the soft shutdown control for overcurrent protection.

[0114] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0115] Based on the same inventive concept, this application also provides a battery control device for implementing the battery control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more battery control device embodiments provided below can be found in the limitations of the battery control method described above, and will not be repeated here.

[0116] Please see Figure 11 This application provides a battery control device, including: an operation control module 112 and a shutdown control module 114.

[0117] The operation control module 112 is used to control the switching devices on the power supply side to operate in a heating mode and control the switching devices on the power receiving side to conduct when an overcurrent occurs in the target battery.

[0118] The shutdown control module 114 is used to control the two switching devices to shut down when the target battery is operating under overcurrent conditions and the preset shutdown conditions are met.

[0119] Please see Figure 12 In some embodiments, the device further includes an overcurrent detection module 122 before the operation control module 112.

[0120] The overcurrent detection module 122 is used to obtain the operating current parameters of the target battery; if the operating current parameters are greater than or equal to the preset overcurrent threshold, it is determined that the target battery has experienced overcurrent.

[0121] In some embodiments, the operation control module 112 is further configured to control the switching device on the power supply side to operate in the linear region and maintain the voltage between the input terminal and the output terminal of the switching device on the power supply side less than a preset breakdown threshold voltage.

[0122] In some embodiments, the operation control module 112 is further configured to determine the overcurrent type of the target battery when an overcurrent occurs in the target battery; and according to the overcurrent type, control the switching devices on the power supply side to operate in a heating mode and control the switching devices on the power receiving side to turn on.

[0123] In some embodiments, the operation control module 112 is further configured to control the switching device connected to the load device to operate in a heating mode and control the switching device connected to the target battery to conduct in the event of a charging overcurrent.

[0124] In some embodiments, the operation control module 112 is further configured to control the switching device connected to the target battery to operate in a heating mode and control the switching device connected to the load device to conduct in the event of a discharge overcurrent.

[0125] In some embodiments, the shutdown control module 114 is further configured to control the two switching devices to shut down when the duration of overcurrent operation of the target battery reaches a preset duration.

[0126] In some embodiments, the shutdown control module 114 is further configured to control the two switching devices to shut down when the voltage between the end of the two switching devices connected to the target battery and the end connected to the load device is less than a preset voltage threshold.

[0127] Each module in the aforementioned battery control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the operations corresponding to each module.

[0128] In the event of an overcurrent in the target battery, the aforementioned battery control device first controls one of the two back-to-back connected switching devices to turn on, while the other operates in a heating mode. Then, when the overcurrent operation of the target battery meets a preset shutdown condition, both switching devices are simultaneously shut off. This scheme, in the event of an overcurrent, does not directly disconnect the switching devices but instead keeps one switching device on while controlling the other to operate in a heating mode. The heating absorbs surge energy, dissipating it within the device's encapsulation structure until the preset shutdown condition is met, at which point both switching devices are shut off. This achieves soft shutdown control of the switching devices, thereby mitigating the impact of the induced electromotive force generated by parasitic inductance on the switching devices and preventing device breakdown.

[0129] Please refer to the following: Figure 2 This application also provides a battery management system, including: a switching device M, a current detection device 21 and a control device 22, wherein two switching devices M are connected back to back and are used to connect to a target battery and a load device (not shown); the current detection device 21 is connected to the target battery and the load device respectively; and the control device 22 is connected to the switching device M, the current detection device 21, the target battery and the load device respectively.

[0130] Specifically, the control device 22 is used to execute the steps of any of the above-described battery control methods, which are as shown in the various embodiments above and will not be repeated here. In the above-described battery management system, when an overcurrent occurs in the target battery, the system first controls the power-receiving switch M to conduct, while the power-supplying switch M operates in a heating mode. Then, when the overcurrent operation of the target battery meets the preset shutdown condition, both switch devices M are simultaneously shut off. In the above scheme, when an overcurrent occurs, the switch device M is not directly disconnected, but one switch device M is kept conducting while the other switch device M operates in a heating mode. The surge energy is absorbed through heating and dissipated within the packaging structure of the switch device M until the preset shutdown condition is met, at which point both switch devices M are shut off. This achieves soft shutdown control of the switch device M, thereby mitigating the impact of the induced electromotive force generated by the parasitic inductance on the switch device M and preventing the switch device M from being damaged.

[0131] Please see Figure 13 In some embodiments, the control device 22 includes a monitoring processor 131 and a controller 132. The switching device M, the current detection device 21 and the target battery are respectively connected to the monitoring processor 131. The monitoring processor 131 is connected to the controller 132. The controller 132 is communicatively connected to the load device (not shown).

[0132] Specifically, in the figure, L represents parasitic inductance, DCDC is a DC-DC converter, the monitoring processor 131 has voltage, current, and temperature monitoring functions, and the controller 132 is the main control device of the battery management system, responsible for the information interaction between the battery management system and the load device, thereby realizing the charging and discharging control of the target battery. The battery control method of this application embodiment is specifically implemented through the monitoring processor 131.

[0133] In the above scheme, the control device 22 includes a monitoring processor 131 and a controller 132. Different data processing functions are implemented through the monitoring processor 131 and the controller 132, which can effectively reduce the data processing pressure and ensure the operational reliability of the control device 22.

[0134] Please see Figure 13In some embodiments, the control device 22 further includes a communicator 133, through which the controller 132 is communicatively connected to the load device.

[0135] Specifically, the connection method between the controller 132 and the load device is not unique. In this embodiment, the battery management system also includes a communicator 133, through which the controller 132 connects to the load device. More specifically, in one embodiment, the communicator 133 includes a CAN (Controller Area Network) communicator.

[0136] In the above scheme, the main control device communicates with the load device through the communicator 133, thereby realizing information interaction between the main control device and the load device, so that the operation of the battery management system is associated with the load device, ensuring the reliability of the battery management system.

[0137] Please see Figure 13 In some embodiments, the switching device M includes a first switching device M1 and a second switching device M2. The drain terminal of the first switching device M1 is used to connect to the target battery. The source terminal of the first switching device M1 is connected to the source terminal of the second switching device M2. The drain terminal of the second switching device M2 is connected to the load device. The source terminals of the first switching device M1 and the second switching device M2, the gate terminal of the first switching device M1 and the gate terminal of the second switching device M2 are respectively connected to the control device 22.

[0138] Specifically, in this embodiment, the switching device M specifically includes a field-effect transistor. The source terminals of the first switching device M1 and the second switching device M2 are connected. Therefore, in actual operation control, it is necessary to combine the actual overcurrent type and control the drain-source voltage of the first switching device M1 or the second switching device M2 to be less than the preset breakdown threshold voltage. When the voltage between the drain terminal of the first switching device M1 and the drain terminal of the second switching device M2 is less than the preset voltage threshold, the first switching device M1 and the second switching device M2 are turned off.

[0139] In the above scheme, the switching device M includes a first switching device M1 and a second switching device M2, and the two switching devices M are connected back to back through the source end to realize the on / off control between the load device and the target battery, and ensure the safe operation of the battery management system.

[0140] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0141] In the event of an overcurrent in the target battery, the switching devices on the power supply side are controlled to operate in a heating mode; when the overcurrent operation of the target battery meets the preset shutdown conditions, the two switching devices are controlled to shut down.

[0142] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0143] In the event of an overcurrent in the target battery, the switching devices on the power supply side are controlled to operate in heating mode, and the switching devices on the power receiving side are controlled to turn on; when the overcurrent operation of the target battery meets the preset shutdown conditions, both switching devices are controlled to turn off.

[0144] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0145] In the aforementioned storage medium and computer program product, when an overcurrent occurs in the target battery, the first step is to control the energized switch to turn on, while the power-supply switch operates in a heating mode. Then, when the overcurrent operation of the target battery meets a preset shutdown condition, both switches are simultaneously shut off. This scheme, in the event of an overcurrent, does not directly disconnect the switches, but instead keeps one switch on while controlling the other to operate in a heating mode. The heating absorbs surge energy, dissipating it within the switch's encapsulation structure until the preset shutdown condition is met, at which point both switches are shut off. This achieves soft shutdown control of the switches, thereby mitigating the impact of the induced electromotive force generated by parasitic inductance on the switches and preventing them from being damaged.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery control method characterized by, The method comprises the following steps: In the case of overcurrent of the target battery, determining the overcurrent type of the target battery; According to the overcurrent type, the switch device on the power supply side is controlled to operate in a heating mode, and the switch device on the power receiving side is controlled to be turned on; wherein, the two switch devices are connected back-to-back and are respectively used to access the target battery and the load device; In the case that the overcurrent operation of the target battery meets the preset off condition, the two switch devices are controlled to be turned off; The control of the switch device on the power supply side to operate in the heating mode comprises: controlling the switch device on the power supply side to work in a linear region, and maintaining the voltage between the input end and the output end of the switch device on the power supply side to be less than a preset breakdown threshold voltage.

2. The battery control method according to claim 1, characterized by, Before determining the overcurrent type of the target battery in the case of overcurrent of the target battery, the method further comprises the following steps: Obtaining the operating current parameter of the target battery; In the case that the operating current parameter is greater than or equal to a preset overcurrent threshold, it is determined that the target battery has overcurrent.

3. The battery control method according to claim 1, characterized by, The overcurrent type includes charging overcurrent; According to the overcurrent type, the switch device on the power supply side is controlled to operate in a heating mode, and the switch device on the power receiving side is controlled to be turned on, comprising: In the case of charging overcurrent, the switch device connected with the load device is controlled to operate in a heating mode, and the switch device connected with the target battery is controlled to be turned on.

4. The battery control method according to claim 1, characterized by, The overcurrent type includes discharging overcurrent; According to the overcurrent type, the switch device on the power supply side is controlled to operate in a heating mode, and the switch device on the power receiving side is controlled to be turned on, comprising: In the case of discharging overcurrent, the switch device connected with the target battery is controlled to operate in a heating mode, and the switch device connected with the load device is controlled to be turned on.

5. The battery control method according to any one of claims 1 to 4, characterized by, In the case that the overcurrent operation of the target battery meets the preset off condition, the two switch devices are controlled to be turned off, comprising: In the case that the duration of the overcurrent operation of the target battery reaches a preset duration, the two switch devices are controlled to be turned off.

6. The battery control method according to any one of claims 1 to 4, characterized by, In the case that the overcurrent operation of the target battery meets the preset off condition, the two switch devices are controlled to be turned off, comprising: In the case that the voltage between the end of the target battery accessed by the two switch devices and the end of the load device accessed by the two switch devices is less than a preset voltage threshold, the two switch devices are controlled to be turned off.

7. A battery control device characterized by comprising: The method comprises the following steps: The running control module is used to determine the overcurrent type of the target battery in the case of overcurrent of the target battery; According to the overcurrent type, the switch device on the power supply side is controlled to operate in a heating mode, and the switch device on the power receiving side is controlled to be turned on; wherein, the two switch devices are connected back-to-back and are respectively used to access the target battery and the load device; The off control module is used to control the two switch devices to be turned off in the case that the overcurrent operation of the target battery meets the preset off condition; The running control module is also used to control the switch device on the power supply side to work in a linear region, and maintain the voltage between the input end and the output end of the switch device on the power supply side to be less than a preset breakdown threshold voltage.

8. A battery management system, characterized by, The method comprises the following steps: The switch device, two switch devices are connected back-to-back and are used to access the target battery and the load device; The current detection device is connected with the target battery and the load device respectively; A control device is connected with the switching device, the current detection device, the target battery and the load device respectively; the control device is used to execute the steps of the battery control method in any one of claims 1-6.

9. The battery management system of claim 8, wherein, The control device comprises a monitoring processor and a controller, the switching device, the current detection device and the target battery are connected with the monitoring processor respectively, the monitoring processor is connected with the controller, and the controller is connected with the load device in communication.

10. The battery management system of claim 9, wherein, The control device further comprises a communicator, and the controller is connected with the load device in communication through the communicator.

11. The battery management system of claim 8, wherein, The switching device comprises a first switching device and a second switching device, the drain end of the first switching device is used to access the target battery, the source end of the first switching device is connected with the source end of the second switching device, the drain end of the second switching device is connected with the load device, and the source end of the first switching device, the source end of the second switching device, the gate end of the first switching device and the gate end of the second switching device are connected with the control device respectively.

12. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the battery control method in any one of claims 1-6.

13. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the battery control method in any one of claims 1-6.

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