Battery control method, battery system and electric equipment

Abstract

The embodiment of the invention provides a battery control method, a battery system and electric equipment, the control method is suitable for the battery system comprising a first battery pack and a second battery pack, a first positive electrode of the first battery pack is connected with a second positive electrode of the second battery pack through a first switch and a first node; the first negative electrode of the first battery pack is connected with the second negative electrode of the second battery pack through the second node and the second switch, one end of the fusing circuit is connected between the first positive electrode and the first switch, and the other end of the fusing circuit is connected between the second negative electrode and the second switch. Determining that the fusing circuit is fused; and controlling the first switch or the second switch to be closed. The scheme can reduce user loss and improve user experience.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery control method, battery system, and electrical device. Background Technology

[0002] Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] If a battery malfunctions during use, it will typically be powered off, disconnecting the battery from external energy sources. For example, during the operation of an electric vehicle, this operation will disconnect the battery from the load, causing the electric vehicle to lose its power source, which will greatly increase the user's losses and reduce the user experience. Summary of the Invention

[0004] This application provides a battery control method, a battery system, and an electrical device, which can reduce user losses and improve user experience during battery use.

[0005] In a first aspect, this application provides a battery control method applicable to a battery system including a first battery pack and a second battery pack. The first positive terminal of the first battery pack is connected to the second positive terminal of the second battery pack sequentially through a first switch and a first node. The first negative terminal of the first battery pack is connected to the second negative terminal of the second battery pack sequentially through a second node and a second switch. One end of a fuse circuit is connected between the first positive terminal and the first switch, and the other end is connected between the second negative terminal and the second switch. The first node and the second node are used to connect a charging and discharging circuit. The control method includes: determining that the fuse circuit is blown when the battery system is in a discharging mode, wherein both the first switch and the second switch are in an open state when the battery system is in a discharging mode; and controlling the first switch or the second switch to close when the fuse circuit is blown, so as to discharge the first battery pack or the second battery pack.

[0006] In this embodiment, by determining that the fuse circuit has blown during discharge mode and controlling the closing of the first or second switch after its blown, the faulty battery pack can be quickly isolated, and the normal battery pack can continue to supply power to the load. This effectively reduces the risk of the battery system being completely powered down due to the fuse circuit blowing, such as allowing the user to drive the electric vehicle to a parking area or repair shop. It significantly improves the power supply reliability of the battery system during discharge, reducing user losses and enhancing the user experience.

[0007] In one possible implementation, the fuse circuit includes a fuse device, and the fuse circuit breaking includes the fuse device breaking.

[0008] In this embodiment, by employing a fuse as the core component of the fuse circuit, its simplicity, reliability, and low cost can be utilized to achieve effective circuit protection. When the fuse is detected to have blown, it can be clearly determined that the battery system circuit has been interrupted, providing a basis for switching the power supply from the first battery pack and the second battery pack in series to one of the battery packs.

[0009] In one possible implementation, the fuse is configured to blow when the current in the fuse is greater than or equal to a preset current.

[0010] In this embodiment, the fuse circuit is configured to automatically blow when the current reaches a preset current threshold, thereby achieving overcurrent protection for the battery system. This passive fuse mechanism requires no complex control logic, responds quickly, and can promptly disconnect the main circuit in the event of extreme faults such as short circuits in the main discharge circuit, preventing the fault from escalating and reducing functional losses in the battery system and electrical equipment.

[0011] In one possible implementation, determining before the fuse circuit blows includes: controlling the fuse circuit to blow when the battery system malfunctions and the current of the fuse circuit is less than a preset current.

[0012] In this embodiment, in addition to passive overcurrent fusing, an active fusing control mechanism is introduced. When the system detects other types of faults (such as insulation failure, thermal runaway, etc.) and the main circuit current has not yet reached the fusing threshold, the system can actively control the fusing circuit to blow and cut off the main discharge circuit. This active fusing method can intervene in the early stages of a fault, reducing losses for the user.

[0013] In one possible implementation, before controlling the first switch or the second switch to close in the event of a blown fuse, the method further includes: determining that a first battery pack or a second battery pack has failed; controlling the first switch or the second switch to close in the event of a blown fuse includes: controlling the second switch to close to discharge the second battery pack in the event of a blown fuse and a failed first battery pack; or, controlling the first switch to close to discharge the first battery pack in the event of a blown fuse and a failed second battery pack.

[0014] In this embodiment, after the fuse circuit blows, by further determining which battery pack has failed, the closing of the switch corresponding to the normal battery pack can be accurately controlled. This power supply switching strategy allows the normal battery pack to be connected to the main discharge circuit, achieving refined fault isolation and redundant power supply management.

[0015] In one possible implementation, before the fuse circuit blows when the battery system is in discharge mode, the control method further includes: determining the operating mode of the battery system, which may include charging mode or discharging mode.

[0016] In the embodiments of this application, by pre-determining the operating mode (charging or discharging) of the battery system, fault handling and main circuit switching strategies can be made more targeted.

[0017] In one possible implementation, the fuse circuit also includes a third switch connected in series with the fuse device, which is closed when the battery system is in discharge mode.

[0018] In this embodiment of the application, by adding a third switch connected in series with the fuse device in the fuse circuit, active control of the on / off state of the main circuit can be achieved, and flexible switching of the main charging circuit can be realized in the charging mode.

[0019] In one possible implementation, the control method further includes: determining the output voltage of the charging device when the battery system is in charging mode; controlling the first switch and the second switch to open and controlling the third switch to close when the output voltage satisfies the series voltage of the first battery pack and the second battery pack; or, controlling the first switch and the second switch to close and controlling the third switch to open when the output voltage does not satisfy the series voltage of the first battery pack and the second battery pack, and the output voltage satisfies the voltage of either the first battery pack or the second battery pack, wherein the voltage difference between the first battery pack and the second battery pack is less than or equal to a preset voltage when the battery system is in charging mode.

[0020] In this embodiment, regarding the charging mode, when the output voltage of the charging device is high enough, the two battery packs are connected in series and then fast-charged through a fuse circuit; when the charging voltage of the charging device is low, the two battery packs are connected in parallel and charged separately by closing the first and second switches to adapt to the low-voltage charging device. This flexible adaptive charging switching greatly improves the compatibility of the battery system with different charging facilities, and enhances the convenience and efficiency of charging.

[0021] Secondly, this application provides a battery system comprising: a battery device including a first battery pack, a second battery pack, a first switch, a second switch, and a fuse circuit; a first positive terminal of the first battery pack being connected to a second positive terminal of the second battery pack sequentially via the first switch and a first node; a first negative terminal of the first battery pack being connected to a second negative terminal of the second battery pack sequentially via a second node and a second switch; one end of the fuse circuit being connected between the first positive terminal and the first switch, and the other end being connected between the second negative terminal and the second switch; the first node and the second node being used to connect a charging and discharging circuit; and a battery management system connected to the first switch and the second switch, the battery management system being used to execute the control method in the first aspect and any possible implementation thereof.

[0022] In one possible implementation, the fuse circuit includes a fuse device.

[0023] In one possible implementation, the fuse device includes an actively triggered fuse device.

[0024] In one possible implementation, the fuse is connected to the battery management system for use in shutting down the fuse via the battery management system.

[0025] In one possible implementation, the fuse circuit also includes a third switch connected in series with the fuse device, and the third switch is connected to the battery management system.

[0026] Thirdly, a battery management system is provided, the battery management system comprising: a memory for storing a program; and a processor for executing the program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to read the instructions and execute the control method as described in the first aspect and any possible implementation thereof.

[0027] Fourthly, an electrical device is provided, the electrical device comprising: a load; and a battery system as described in the second aspect and any possible implementation thereof, the battery system being connected to the load for supplying power to the load.

[0028] Fifthly, a chip is provided, comprising: a processor for calling and running a computer program from memory, causing a device on which the chip is mounted to perform the methods of the first aspect and any possible implementation thereof.

[0029] In a sixth aspect, a computer program is provided that, when executed by a computer, causes the computer to implement the methods described in the first aspect and any possible implementation thereof.

[0030] In a seventh aspect, a computer-readable storage medium is provided for storing a computer program that, when executed by a computer, causes the computer to implement the methods described in the first aspect and any possible implementation thereof.

[0031] Eighthly, a computer program product is provided, including computer program instructions that, when executed by a computer, cause the computer to implement the methods of the first aspect and any possible implementation thereof. Attached Figure Description

[0032] Figure 1 A schematic diagram of the vehicle provided in this application.

[0033] Figure 2 This is a schematic flowchart illustrating the battery control method provided in an embodiment of this application.

[0034] Figure 3 This is a partial schematic diagram of a battery system provided in an embodiment of this application.

[0035] Figure 4 This is a schematic diagram of a fuse circuit provided in an embodiment of this application.

[0036] Figure 5 This is another schematic flowchart illustrating the battery control method provided in an embodiment of this application.

[0037] Figure 6 Another schematic diagram of the fuse circuit provided in the embodiments of this application.

[0038] Figure 7 This is another schematic flowchart of the battery control method provided in the embodiments of this application.

[0039] Figure 8 This is another schematic flowchart of the battery control method provided in the embodiments of this application.

[0040] Figure 9 This is a schematic diagram of the battery system provided in the embodiments of this application.

[0041] Figure 10 This is a partial schematic diagram of the battery system provided in an embodiment of this application.

[0042] Figure 11 This is another partial schematic diagram of the battery system provided in the embodiments of this application.

[0043] Figure 12 This is a schematic block diagram of the electrical device provided in the embodiments of this application.

[0044] Figure label: Vehicle: 1, Controller: 30, Motor: 40, Battery System: 300, Battery Unit: 301, First Battery Pack: 310, Second Battery Pack: 320, Fuse Circuit: 330, Charge / Discharge Circuit: 340, First Charge / Discharge Circuit: 341, Second Charge / Discharge Circuit: 342, First Switch: K1, Second Switch: K2, Third Switch: K3, Fuse Device: F, First Node: G1, Second Node: G2, Main Positive Relay: K Positive, Main Negative Relay: K Negative, Precharge Relay: K Precharge, Precharge Resistor: R, Battery Management System: 4000, Electrical Device: 7000, Load: 7100. Detailed Implementation

[0045] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0046] 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, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0047] The term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0048] 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.

[0049] In this application, the terms "upper," "lower," "left," "right," "inner," and "outer," indicating orientation or positional relationships, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0050] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0052] If a battery malfunctions during use, it will typically be powered off, disconnecting the battery from external energy sources. For example, during the operation of an electric vehicle, this operation will disconnect the battery from the load, causing the electric vehicle to lose its power source, which will greatly increase the user's losses and reduce the user experience.

[0053] In view of this, embodiments of this application provide a battery control method, a battery system, and an electrical device. The control method is applicable to a battery system including a first battery pack and a second battery pack. The first positive terminal of the first battery pack is connected to the second positive terminal of the second battery pack in sequence through a first switch and a first node. The first negative terminal of the first battery pack is connected to the second negative terminal of the second battery pack in sequence through a second node and a second switch. One end of a fuse circuit is connected between the first positive terminal and the first switch, and the other end is connected between the second negative terminal and the second switch. The first node and the second node are used to connect a charging and discharging circuit. The control method includes: when the battery system is in a discharging mode, determining that the fuse circuit has blown, wherein when the battery system is in a discharging mode, both the first switch and the second switch are in an open state; when the fuse circuit has blown, controlling the first switch or the second switch to close, so as to discharge the first battery pack or the second battery pack.

[0054] The battery control method provided in this application embodiment can control the first switch or the second switch to close if the fuse blows due to a battery fault while the first battery pack and the second battery pack are discharging, so that the first battery pack or the second battery pack can continue to discharge. This can reduce the risk of the battery system being directly powered off and improve the user experience.

[0055] The technical solutions described in the embodiments of this application are applicable to various devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0056] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using vehicles as an example.

[0057] Figure 1 This is a schematic diagram of a vehicle provided in an embodiment of this application.

[0058] Vehicle 1 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 motor 40, a controller 30, and a battery system 300 can be installed inside vehicle 1. The controller 30 can be used to manage the power supply from the battery system 300 to the motor 40. For example, the battery system 300 can be installed at the bottom, front, or rear of vehicle 1.

[0059] The battery system 300 can be used to power the vehicle 1. In some embodiments, the battery system 300 can serve as the operating power source for the vehicle 1's electrical system, for example, to meet the power requirements of the vehicle 1 during startup, navigation, and operation.

[0060] In some embodiments, the battery system 300 can also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0061] To meet diverse power demands, the battery system 300 may include multiple battery cells, which can be connected in series, parallel, or a combination of both. For example, multiple battery cells can first be connected in series, parallel, or a combination of both to form a battery module. These battery modules can then be connected in series, parallel, or a combination of both to form a battery device. In other words, multiple battery cells can directly form a battery device; or they can first be assembled into battery modules, and then the battery modules can be assembled into a battery device.

[0062] The battery system 300 may also include a battery management system, which can be used to monitor the state parameters of the battery device, such as current, voltage, SOC and temperature, in order to control the charging and discharging of the battery device.

[0063] It should be understood that Figure 1 The components shown are just examples. In actual applications, the components may have different names, or they may be added or deleted as needed.

[0064] The following combination Figures 2 to 5 The battery control method provided in the embodiments of this application will be described by way of example.

[0065] Figure 2 This is a schematic flowchart illustrating the battery control method provided in an embodiment of this application. Figure 2 The control methods shown include the following.

[0066] Figure 2 The method shown is applicable to Figure 3 The battery system 300 shown includes a first battery pack 310 and a second battery pack 320. The first positive terminal of the first battery pack 310 is connected to the second positive terminal of the second battery pack 320 in sequence through a first switch K1 and a first node G1. The first negative terminal of the first battery pack 310 is connected to the second negative terminal of the second battery pack 320 in sequence through a second node G2 and a second switch K2. One end of the fuse circuit 330 is connected between the first positive terminal and the first switch K1, and the other end is connected between the second negative terminal and the second switch K2. The first node G1 and the second node G2 are used to connect the charging and discharging circuit 340.

[0067] The charging and discharging circuit 340 refers to an energy transfer circuit, such as a circuit in which the battery system 300 obtains energy from the outside and / or a circuit in which the battery system 300 discharges to a load.

[0068] As an example, the charging and discharging circuit 340 may include a first charging and discharging circuit 341 and a second charging and discharging circuit 342. One end of the first battery pack 310 and the second battery pack 320 is connected to the first charging and discharging circuit 341 through a first node G1, and the other end of the first battery pack 310 and the second battery pack 320 is connected to the second charging and discharging circuit 342 through a second node G2. The first charging and discharging circuit 341 is then connected to the second charging and discharging circuit 342 through a load or an external charging device, thereby forming a charging and discharging main circuit.

[0069] As an example, the first charging / discharging circuit 341 includes a main positive relay Kpositive and a pre-charging resistor R and a pre-charging relay Kpre-charge connected in parallel with it. The second charging / discharging circuit 342 includes a main negative relay Knegative.

[0070] As an example, a charging and discharging circuit includes a charging circuit and a discharging circuit, which can be independent circuits (not shown separately in the figure). For example, the charging circuit includes a first charging circuit and a second charging circuit, and the discharging circuit includes a first discharging circuit and a second discharging circuit.

[0071] The first battery pack 310 may include multiple battery cells, and the second battery pack 320 may include multiple battery cells.

[0072] S210, when the battery system 300 is in discharge mode, determine that the fuse circuit 330 is blown.

[0073] When the battery system 300 is in discharge mode, both the first switch K1 and the second switch K2 are in the off state.

[0074] When the battery system 300 is working normally and in discharge mode, that is, when the battery system 300 is discharging without malfunction, both the first switch K1 and the second switch K2 are in the open state. The first battery pack 310 and the second battery pack 320 are connected in series through the fuse circuit 330 and can supply power to the load.

[0075] When the battery system 300 is in discharge mode, the fuse circuit 330 blows, indicating that the battery system 300 has malfunctioned. For example, if the battery system 300 malfunctions and the current in the main discharge circuit exceeds the range that the fuse circuit 330 can withstand, the fuse circuit 330 will blow automatically.

[0076] As an example, the battery system 300 may be in a discharge mode, which may include a phase in which the battery and load complete communication confirmation (the process of establishing a normal communication connection and completing discharge parameter negotiation), but the relay is not closed, that is, no energy transfer is taking place.

[0077] As another example, when the battery system 300 is in discharge mode, it may include a phase in which the battery transfers energy to the load after the relay is closed.

[0078] As an example, the presence or absence of a blown fuse circuit 330 can be determined by observing changes in the current in the main discharge circuit. For instance, if the current is less than the normal operating current range corresponding to the main discharge circuit, it can be determined that the blown fuse circuit 330 has blown.

[0079] As another example, whether the fuse circuit 330 has blown can be determined by the change in the voltage difference across the fuse circuit 330. For example, when the voltage difference across the fuse device is greater than or equal to a preset voltage (such as the series voltage of the first battery pack 310 and the second battery pack 320), it can be determined that the fuse circuit 330 has blown.

[0080] S220, in the event that the fuse circuit 330 is blown, controls the first switch K1 or the second switch K2 to close, so as to discharge the first battery pack 310 or the second battery pack 320.

[0081] Battery failure is usually caused by the failure of one or more individual battery cells. In other words, a battery failure could occur if one of the battery packs 310 and 320 fails while the other battery pack is functioning normally.

[0082] In this situation, the fuse 330 blows, which can isolate the spread of the fault.

[0083] In this embodiment, the connection between the first battery pack 310 and the second battery pack 320 can be severed by blowing the fuse circuit 330. Simultaneously, by controlling the closure of the first switch K1 or the second switch K2, the first battery pack 310 or the second battery pack 320 can be discharged. This means that the faulty battery pack in the first battery pack 310 and the second battery pack 320 can stop discharging, while the non-faulty battery pack can discharge to the load.

[0084] In this embodiment, the first switch K1 or the second switch K2 can be closed simultaneously with the melting of the fuse circuit 330. Alternatively, the first switch K1 or the second switch K2 can be closed rapidly after the fuse circuit 330 melts.

[0085] In this embodiment, by determining the state of the fuse circuit 330 in discharge mode and controlling the closing of the first switch K1 or the second switch K2 after it blows, the faulty battery pack can be quickly isolated, and the normal battery pack can continue to supply power to the load. This effectively reduces the risk of the battery system 300 being completely powered down due to the fuse circuit 330 blowing, which could prevent the user from driving the electric vehicle to a parking area or repair shop. It significantly improves the power supply reliability of the battery system 300 during discharge, reducing user losses and enhancing the user experience.

[0086] As an example, in this embodiment, the switching of the state of the fuse circuit 330 and the first switch K1 or the second switch K2 is involved. The states of the main positive relay K positive, the precharge relay K precharge and the main negative relay K negative of the battery system 300 can remain unchanged, such as the main positive relay K positive and the main negative relay K negative being closed and the precharge relay K precharge being open.

[0087] In some embodiments, such as Figure 4 As shown, the fuse circuit 330 includes a fuse device F, and the fuse circuit 330 is fused by the fuse device F.

[0088] That is, the fuse circuit 330 is deactivated by the fuse device F within it. When the battery is not faulty, the fuse circuit 330 remains unbroken, connecting the first positive terminal of the first battery pack 310 and the second negative terminal of the second battery pack 320. When the battery malfunctions, the fuse circuit 330 deactivates, disconnecting the first positive terminal of the first battery pack 310 and the second negative terminal of the second battery pack 320.

[0089] As an example, the fusing of the fuse device F can be either active or passive. Active fusing typically involves cutting off the conductive path of the fuse device F through a built-in mechanism, such as a high-voltage impact generated by pyrotechnic agents, igniters, or a mechanical impact from a breaking device, thus severing the conductive copper plate of the fuse device F. Passive fusing occurs when the current in the fuse device F exceeds a preset current, causing the fuse device F to fuse spontaneously.

[0090] The pyrotechnic agents, igniters, or interruption devices can be integrated into the fuse device F, or they can be set up independently from the fuse device F.

[0091] As an example, the fuse device F can simultaneously achieve the two fuse-breaking methods mentioned above.

[0092] In this embodiment, by using a fuse F as the core component of the fuse circuit 330, its simplicity, reliability, and low cost can be utilized to achieve effective circuit protection. When the fuse F is detected to have blown, it can be clearly determined that the circuit of the battery system 300 has been interrupted, providing a basis for switching the power supply of the first battery pack 310 and the second battery pack 320 in series to one of the battery packs.

[0093] In some embodiments, the fuse circuit 330 is configured to blow when the current in the fuse circuit 330 is greater than or equal to a preset current.

[0094] For example, in the event of a battery system 300 malfunction, the current generated in the first battery pack 310, the fuse circuit 330, and the second battery series circuit is greater than or equal to a preset current, causing the fuse circuit 330 to spontaneously blow due to excessive current. In this case, the malfunction of the battery system 300 is usually caused by an overcurrent fault such as a load short circuit, a discharge circuit short circuit, or an internal short circuit within the battery pack.

[0095] In this embodiment, the fuse circuit 330 is configured to automatically fuse when the current reaches a preset current threshold, thereby achieving overcurrent protection for the battery system 300. This passive fuse mechanism does not require complex control logic, responds quickly, and can promptly disconnect the main circuit in the event of extreme faults such as short circuits in the main discharge circuit, preventing the fault from escalating and reducing functional losses in the battery system 300 and electrical equipment.

[0096] In some embodiments, before determining that the fuse circuit 330 has blown, the control method further includes: controlling the fuse circuit 330 to blow when the battery system 300 fails and the current of the fuse circuit 330 is less than a preset current.

[0097] For example, if the battery system 300 malfunctions and the malfunction is not an overcurrent fault, the fuse circuit 330 will not blow spontaneously. In this case, the fuse circuit 330 can be controlled to blow through the battery management system.

[0098] For example, the battery management system can send control information to the fuse device F, causing the high-voltage impact generated by the pyrotechnic agent, igniter, etc. inside the fuse device F or the mechanical impact generated by the breaking device to cut off the fuse device F and thus cut off the fuse circuit 330.

[0099] In this embodiment, in addition to passive overcurrent fusing, an active fusing control mechanism is introduced. When the system detects other types of faults (such as insulation failure, thermal runaway, etc.) and the main circuit current has not yet reached the fusing threshold, the fusing circuit 330 can be actively controlled to blow to cut off the main discharge circuit. This active fusing method can intervene in the early stage of the fault, which can reduce the user's losses.

[0100] Figure 5 This is a schematic flowchart of the battery control method provided in an embodiment of this application. Figure 5 The method shown is applicable to Figure 3 The battery system 300 shown includes a first battery pack 310 and a second battery pack 320. The first positive terminal of the first battery pack 310 is connected to the second positive terminal of the second battery pack 320 in sequence through a first switch K1 and a first node G1. The first negative terminal of the first battery pack 310 is connected to the second negative terminal of the second battery pack 320 in sequence through a second node G2 and a second switch K2. One end of the fuse circuit 330 is connected between the first positive terminal and the first switch K1, and the other end is connected between the second negative terminal and the second switch K2. The first node G1 and the second node G2 are used to connect the charging and discharging circuit 340.

[0101] S510a, when the battery system 300 is in discharge mode, it is determined that the fuse circuit 330 is blown.

[0102] The fuse circuit 330 is configured to blow when the current in the fuse circuit 330 is greater than or equal to a preset current.

[0103] That is, when the battery system 300 is in discharge mode, if the current in the main discharge circuit is greater than or equal to the preset current due to a battery overcurrent fault, the fuse circuit 330, such as the fuse device F therein, will blow.

[0104] For fuse failure caused by the fusing method in step S510a, the fusing circuit 330 can be determined to have failed based on the collected current or voltage signals. For example, the fusing circuit 330 can be determined to have failed by observing changes in the current in the main discharge circuit. For instance, if the current is less than the normal operating current range corresponding to the main discharge circuit, it can be determined that the fusing circuit 330 has failed.

[0105] As another example, the presence or absence of a fuse circuit 330 can be determined by the change in the voltage difference across the fuse circuit 330. For instance, if the voltage difference across the fuse device F is greater than or equal to a preset voltage (such as the series voltage between the first battery pack 310 and the second battery pack 320), it can be determined that the fuse circuit 330 has blown.

[0106] S510b controls the fuse circuit 330 to blow when the battery system 300 is in discharge mode, the battery system 300 malfunctions, and the current of the fuse circuit 330 is less than the preset current.

[0107] When the system is in discharge mode and a non-overcurrent fault occurs in the battery system 300, the current in the main discharge circuit is less than the preset current, and the fuse circuit 330, such as the fuse device F therein, will not spontaneously melt.

[0108] As an example, the high-pressure impact or mechanical impact generated by the pyrotechnic agent, igniter, etc. inside the fuse device F can be controlled to cut off the conductive path of the fuse device F, thereby controlling the fuse circuit 330 to melt.

[0109] S520b, confirms that fuse circuit 330 is blown.

[0110] It has been determined that the fuse has blown.

[0111] For the fuse blow-off caused by the fuse blow-off method in step S510b, in addition to determining that the fuse circuit 330 has blown off based on the collected current or voltage signals as described above, the fuse circuit 330 can also be determined to have blown off based on other methods.

[0112] As an example, the battery management system can send a signal to the fuse F to control the generation of a high-voltage surge or mechanical shock inside the fuse F to cut off the fuse F. When the battery management system sends a signal to the fuse F, it can determine that the fuse circuit 330 has blown.

[0113] As another example, when the fuse device F cuts off its own conductive path, it can send a signal back to the battery management system, which can then determine that the fuse circuit 330 has been blown based on the signal.

[0114] S530, determines that either the first battery pack 310 or the second battery pack 320 has malfunctioned.

[0115] If the fuse circuit 330 is found to be blown, it is also necessary to determine which battery pack, the first battery pack 310 or the second battery pack 320, has failed.

[0116] As an example, a fault in the first battery pack 310 or the second battery pack 320 can be determined by monitoring the state parameters of the first battery pack 310 and the second battery pack 320, such as SOC, voltage, current, and temperature.

[0117] S540a, in the event that the fuse circuit 330 blows and the first battery pack 310 malfunctions, the second switch K2 is closed to discharge the second battery pack 320.

[0118] In this embodiment, if the first battery pack 310 fails when the fuse circuit 330 blows, the second battery pack 320 can still operate normally. Therefore, the second switch K2 can be controlled to close while the first switch K1 remains open. The second battery pack 320, the first node G1, the first discharge circuit, the load, the second discharge circuit, the second node G2, and the second switch K2 are connected in series to form a closed discharge circuit, enabling the second battery pack 320 to supply power to the load.

[0119] S540b controls the first switch K1 to close in the event that the fuse circuit 330 blows and the second battery pack 320 malfunctions, so as to discharge the first battery pack 310.

[0120] In this embodiment, if the second battery pack 320 malfunctions when the fuse circuit 330 blows, the first battery pack 310 can still operate normally. Therefore, the first switch K1 can be controlled to close while the second switch K2 remains open. The first battery pack 310, the first switch K1, the first node G1, the first discharge circuit, the load, the second discharge circuit, and the second node G2 are connected in series to form a closed discharge circuit, enabling the first battery pack 310 to supply power to the load.

[0121] In this embodiment, after the fuse circuit 330 blows, by further determining which battery pack has failed, the closing of the switch corresponding to the normal battery pack can be accurately controlled. This power supply switching strategy allows the normal battery pack to be connected to the main discharge circuit, achieving refined fault isolation and redundant power supply management.

[0122] In some embodiments, when the battery system 300 is in a discharge mode, before the fuse circuit 330 blows, the control method further includes: determining the operating mode of the battery system 300, the operating mode including a charging mode or a discharging mode.

[0123] As an example, the magnitude and direction of the current in the main circuit of the battery system 300 can be used to determine whether the battery system 300 is in charging mode or discharging mode.

[0124] As another example, the battery system 300 can be determined to be in charging or discharging mode based on the communication information of the battery management system. For example, the battery system 300 can be considered to be in charging mode during the period from when the battery management system completes a communication handshake with the external charging device until it exits the charging mode (e.g., charging is complete); similarly, the battery system 300 can be considered to be in charging mode during the period from when the battery management system completes a communication handshake with the load until it exits the discharging mode (e.g., when it receives a stop discharging command from the device and disconnects the main positive and main negative relays).

[0125] In this embodiment of the application, by pre-determining the operating mode (charging or discharging) of the battery system 300, fault handling and main circuit switching strategies can be made more targeted.

[0126] In some embodiments, such as Figure 6 As shown, the fuse circuit 330 also includes a third switch K3 connected in series with the fuse device F. When the battery system 300 is in discharge mode, the third switch K3 is in a closed state.

[0127] In this embodiment, when the battery system 300 is in discharge mode, the third switch K3 is in a closed state, and even if the battery system 300 fails, the third switch K3 can still be in a closed state.

[0128] The first switch K1, the second switch K2, and the third switch K3 can switch states when the battery system 300 is in charging mode, so as to realize the switching between series and parallel connection of the first battery pack 310 and the second battery pack 320 or the switching between series charging and individual charging.

[0129] As an example, if an external charging device, such as a charging pile, can only charge the battery pack with the lower voltage between the first battery pack 310 and the second battery pack 320, such as the voltage of the first battery pack 310 being lower than the voltage of the second battery pack 320, then when the battery system 300 is in charging mode, the third switch K3 can be turned off, the first switch K1 can be turned on, and the second switch K2 can remain off. At this time, the first battery pack 310 can be controlled to charge.

[0130] In this embodiment of the application, by adding a third switch K3 connected in series with the fuse device F in the fuse circuit 330, active control of the on / off state of the main circuit can be realized, and flexible switching of the main charging circuit can be realized in the charging mode.

[0131] Figure 7 This is another schematic flowchart illustrating the battery control method provided in an embodiment of this application. Figure 7 The method shown is applicable to Figure 3The battery system 300 shown includes a first battery pack 310 and a second battery pack 320. The first positive terminal of the first battery pack 310 is connected to the second positive terminal of the second battery pack 320 in sequence through a first switch K1 and a first node G1. The first negative terminal of the first battery pack 310 is connected to the second negative terminal of the second battery pack 320 in sequence through a second node G2 and a second switch K2. One end of the fuse circuit 330 is connected between the first positive terminal and the first switch K1, and the other end is connected between the second negative terminal and the second switch K2. The first node G1 and the second node G2 are used to connect the charging and discharging circuit 340.

[0132] Among them, the fuse circuit 330 includes Figure 6 The fuse F and the third switch K3 are shown in series.

[0133] S710 determines the output voltage of the charging device when the battery system 300 is in charging mode.

[0134] As an example, a charging device refers to a device external to the battery system 300 that can be used to charge the battery system 300, such as a charging pile.

[0135] As an example, the battery management system can obtain the output voltage parameters of the charging device. For instance, after the charging gun is plugged in, the charging station can send its own output voltage parameters to the battery management system, or the output voltage of the charging device can be measured through a voltage detection circuit.

[0136] S720a, when the output voltage meets the series voltage of the first battery pack 310 and the second battery pack 320, controls the first switch K1 and the second switch K2 to open and controls the third switch K3 to close.

[0137] In this embodiment, the battery management system compares the output voltage of the charging device with the total series voltage required for the first battery pack 310 and the second battery pack 320. If the output voltage of the charging device is high enough to charge both battery packs in series simultaneously (i.e., the output voltage is greater than or equal to the sum of the voltages of the first battery pack 310 and the second battery pack 320), the battery system 300 enters the series charging mode.

[0138] As an example, to achieve series charging, the BMS controls both the first switch K1 and the second switch K2 to be in the open state, while simultaneously controlling the third switch, which is connected in series with the fuse F, to be in the closed state. At this time, the charging current path is: positive terminal of the charging device - first charging circuit - first node G1 - fuse F - third switch - second battery pack 320 - second node G2 - second charging circuit - negative terminal of the charging device, forming a series charging circuit, simultaneously charging the first battery pack 310 and the second battery pack 320.

[0139] S720b, when the output voltage cannot meet the series voltage of the first battery pack 310 and the second battery pack 320, but the output voltage meets the voltage of either the first battery pack 310 or the second battery pack 320, controls the first switch K1 and the second switch K2 to close and controls the third switch K3 to open.

[0140] When the battery system 300 is in charging mode, the voltage difference between the first battery pack 310 and the second battery pack 320 is less than or equal to a preset voltage.

[0141] If the output voltage of the charging device is too low to meet the needs of charging two battery packs in series (for example, the charging pile is a low-voltage pile and can only match the voltage of a single battery pack), but is sufficient to meet the charging voltage requirements of either the first battery pack 310 or the second battery pack 320, then the battery system 300 enters the individual charging mode or the parallel charging mode.

[0142] As an example, to improve charging efficiency, it is typically necessary to ensure that the states of the first battery pack 310 and the second battery pack 320 are relatively close, i.e., the voltage difference between them is less than or equal to a preset voltage (for example, to reduce the risk of generating large circulating currents or causing imbalance between battery packs during switching). Under this condition, the battery management system can control both the first switch K1 and the second switch K2 to be closed, while simultaneously controlling the third switch to be open. At this time, the two battery packs are in parallel, and the charging equipment can charge both parallel battery packs simultaneously.

[0143] In this embodiment, regarding the charging mode, when the output voltage of the charging device is high enough, the two battery packs are connected in series and then fast-charged through the fuse circuit 330; when the charging voltage of the charging device is low, the two battery packs are connected in parallel and charged separately by closing the first and second switches K2, to adapt to the low-voltage charging device. This flexible adaptive charging switching greatly improves the compatibility of the battery system 300 with different charging facilities, and enhances the convenience and efficiency of charging.

[0144] Optionally, when an external charging device, such as a charging pile, is charging either the first battery pack 310 or the second battery pack 320, if the voltage difference between the two battery packs is significant, then while the battery system 300 is in charging mode, one of the first switches K1 and K2 can be closed and the other opened, while simultaneously opening the third switch. In this case, one of the two battery packs can be charged individually.

[0145] Optionally, when an external charging device, such as a charging pile, meets the charging needs of the battery pack with the lower voltage (e.g., the first battery pack 310) in the first battery pack 310 and the second battery pack 320, the first battery pack 310 can be charged independently while the battery system 300 is in charging mode by controlling the first switch K1 to close, the second switch K2 to open, and the third switch to open.

[0146] Figure 8 This is another schematic flowchart illustrating the battery control method provided in an embodiment of this application. Figure 8 The method shown is applicable to Figure 3 The battery system 300 shown includes a first battery pack 310 and a second battery pack 320. The first positive terminal of the first battery pack 310 is connected to the second positive terminal of the second battery pack 320 in sequence through a first switch K1 and a first node G1. The first negative terminal of the first battery pack 310 is connected to the second negative terminal of the second battery pack 320 in sequence through a second node G2 and a second switch K2. One end of the fuse circuit 330 is connected between the first positive terminal and the first switch K1, and the other end is connected between the second negative terminal and the second switch K2. The first node G1 and the second node G2 are used to connect the charging and discharging circuit 340.

[0147] Among them, the fuse circuit 330 includes Figure 6 The fuse F and the third switch K3 are shown in series.

[0148] S810 determines the operating mode of the battery system 300.

[0149] The operating modes include charging mode or discharging mode.

[0150] S820A-1 determines that the fuse circuit 330 is blown when the battery system 300 is in discharge mode.

[0151] The fuse circuit 330 is configured to blow when the current in the fuse circuit 330 is greater than or equal to a preset current.

[0152] S820A-2 controls the fuse circuit 330 to blow when the battery system 300 is in discharge mode, the battery system 300 malfunctions, and the current of the fuse circuit 330 is less than the preset current.

[0153] S 830A-2, confirm that the fuse circuit 330 is blown.

[0154] S 840A, determines that either the first battery pack 310 or the second battery pack 320 has malfunctioned.

[0155] S 850A-1 controls the second switch K2 to close in the event that the fuse circuit 330 blows and the first battery pack 310 fails, so as to discharge the second battery pack 320.

[0156] S850A-2, in the event that the fuse circuit 330 blows and the second battery pack 320 malfunctions, controls the first switch K1 to close so that the first battery pack 310 discharges.

[0157] S820B determines the output voltage of the charging device when the battery system 300 is in charging mode.

[0158] S830B-1, when the output voltage meets the series voltage of the first battery pack 310 and the second battery pack 320, controls the first switch K1 and the second switch K2 to open and controls the third switch K3 to close.

[0159] S830B-2, when the output voltage cannot meet the series voltage of the first battery pack 310 and the second battery pack 320, but the output voltage meets the voltage of either the first battery pack 310 or the second battery pack 320, controls the first switch K1 and the second switch K2 to close and controls the third switch K3 to open.

[0160] When the battery system 300 is in charging mode, the voltage difference between the first battery pack 310 and the second battery pack 320 is less than or equal to a preset voltage.

[0161] The contents of steps S810 to S850 can be referred to in the relevant description above, and for the sake of brevity, they will not be repeated here.

[0162] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0163] The battery control method of the embodiments of this application has been described in detail above. The following will be combined with… Figures 9 to 11 The battery system provided in the embodiments of this application will be described.

[0164] like Figures 9 to 11 As shown in the figure, this application embodiment also provides a battery system 300, which may include a battery device 301 and a battery management system 4000.

[0165] like Figure 9As shown, the battery device 301 includes a first battery pack 310, a second battery pack 320, a first switch K1, a second switch K2, and a fuse circuit 330. The first positive terminal of the first battery pack 310 is connected to the second positive terminal of the second battery pack 320 in sequence through the first switch K1 and the first node G1. The first negative terminal of the first battery pack 310 is connected to the second negative terminal of the second battery pack 320 in sequence through the second node G2 and the second switch K2. One end of the fuse circuit 330 is connected between the first positive terminal and the first node G1, and the other end is connected between the second negative terminal and the second node G2. The first node G1 and the second node G2 are used to connect the charging and discharging circuit 340.

[0166] The battery management system 4000 is connected to the first switch K1 and the second switch K2. The battery management system 4000 can be used to execute various control methods in the above method embodiments. For example, the battery management system 4000 is used to determine that the fuse circuit 330 is blown when the battery system 300 is in a discharge mode, wherein both the first switch K1 and the second switch K2 are in an open state when the battery system 300 is in a discharge mode; and when the fuse circuit 330 is blown, control the first switch K1 or the second switch K2 to close so that the first battery pack 310 or the second battery pack 320 discharges.

[0167] Figure 9 For related content, please refer to the above text. Figure 2 and Figure 3 The relevant descriptions in the document are not repeated here.

[0168] In some embodiments, such as Figure 10 As shown, the fuse circuit 330 includes a fuse device F.

[0169] The details of the fuse circuit 330, including the fuse device F, can be found in the description in the method embodiments, and will not be repeated here.

[0170] In some embodiments, the fuse device F includes an active triggering fuse device F.

[0171] An active triggering fuse F refers to a fuse F that can actively fuse, that is, a fuse F that can cut off the conductive path of the fuse F by high pressure impact generated by built-in pyrotechnic agents, igniters, etc., or mechanical impact of a breaking device.

[0172] In some embodiments, such as Figure 10 As shown, the fuse F is connected to the battery management system 4000 and is used to disconnect the fuse via the battery management system 4000.

[0173] As an example, the battery management system 4000 can send control information to the fuse device F, causing the high-voltage impact generated by the pyrotechnic agent, igniter, etc. inside the fuse device F or the mechanical impact generated by the breaking device to cut off the fuse device F and thus cut off the fuse circuit 330.

[0174] As another example, the fuse F can also report information about the fuse F being blown to the battery management system 4000.

[0175] In some embodiments, such as Figure 11 As shown, the fuse circuit 330 also includes a third switch K3 connected in series with the fuse device F, and the third switch K3 is connected to the battery management system 4000.

[0176] In this embodiment, the battery management system 4000 can be used to control the closing and opening of the third switch K3.

[0177] The third switch K3 is connected between the first positive terminal of the first battery pack 310 and the fuse F. Optionally, the third switch K3 can be connected between the fuse F and the second negative terminal of the second battery pack 320.

[0178] like Figure 12 As shown in the figure, this application embodiment also provides an electrical device 7000.

[0179] Electrical device 7000 includes a load 7100 and a battery system 300, wherein the battery system 300 is connected to the load 7100 and is used to supply power to the load 7100.

[0180] As an example, the battery system 300 is used to provide DC power to the load 7100, the voltage of which is greater than a voltage threshold. That is, the load 7100 is a high-voltage load, and the battery system 300 can supply high-voltage power to the load 7100.

[0181] As an example, electrical appliances may also include other loads such as low-voltage loads.

[0182] For details on the battery system 300, please refer to the above text. Figures 9 to 11 For the sake of brevity, the relevant descriptions will not be repeated here.

[0183] In this application, "high voltage" and "low voltage" are relative concepts; that is, high voltage involves a voltage higher than low voltage. Generally speaking, the difference between high-voltage and low-voltage related circuits or components is that high-voltage related circuits or components refer to circuits or components that can be directly or indirectly connected to the battery system. This is because the battery system consists of several battery cells, providing a relatively high voltage.

[0184] As will be understood by those skilled in the art, high voltage generally refers to voltages greater than tens of volts, hundreds of volts, or higher. Circuits and components operating at voltages greater than tens of volts, hundreds of volts, or higher can be used or processed. For example, circuits and components operating at voltages greater than 30V AC RMS and less than or equal to 1000V AC RMS, or greater than 60V DC and less than or equal to 1500V DC. Here, V represents volts, AC RMS represents the effective power in the alternating current waveform, and DC represents direct current.

[0185] Low voltage generally refers to voltages of tens of volts, 10 volts, or lower. Low-voltage related circuits or components refer to circuits and components that can use or handle voltages of tens of volts, 10 volts, or lower. For example, circuits and components with a maximum operating voltage of no more than 30V AC RMS or no more than 60V DC. Here, V represents volts, AC RMS represents the effective power in the alternating current waveform, and DC represents direct current.

[0186] This application also provides a battery management system, which includes: a memory for storing programs; and a processor for executing the programs stored in the memory. When the programs stored in the memory are executed, the processor reads the instructions and executes the various control methods provided in this application according to the instructions.

[0187] This application also provides a computer-readable storage medium for storing computer programs.

[0188] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0189] This application also provides a computer program product, including computer program instructions.

[0190] When the computer program instructions are run on a computer, the computer causes the computer to perform the various methods of the embodiments of this application.

[0191] This application also provides a computer program.

[0192] When the computer program is run on a computer, it causes the computer to perform the various methods of the embodiments of this application.

[0193] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0194] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0195] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of this application may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0196] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0197] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0198] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0199] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 method for controlling a battery, characterized in that, The control method is applicable to a battery system including a first battery pack and a second battery pack. The first positive terminal of the first battery pack is sequentially connected to the second positive terminal of the second battery pack via a first switch and a first node. The first negative terminal of the first battery pack is sequentially connected to the second negative terminal of the second battery pack via a second node and a second switch. One end of a fuse circuit is connected between the first positive terminal and the first switch, and the other end is connected between the second negative terminal and the second switch. The first node and the second node are used to connect a charging / discharging circuit. The control method includes: When the battery system is in discharge mode, it is determined that the fuse circuit is blown, wherein both the first switch and the second switch are in the off state when the battery system is in discharge mode; In the event that the fuse circuit blows, the first switch or the second switch is closed to discharge the first battery pack or the second battery pack.

2. The control method according to claim 1, characterized in that, The fusible circuit includes a fusible device, and the fusible circuit being fused includes the fusible device being fused.

3. The control method according to claim 1, characterized in that, The fuse circuit is configured to blow when the current in the fuse circuit is greater than or equal to a preset current.

4. The control method according to claim 1, characterized in that, Before determining that the fuse circuit has blown, the following steps are included: If the battery system malfunctions and the current in the fuse circuit is less than a preset current, the fuse circuit is controlled to blow.

5. The control method according to claim 1, characterized in that, In the event that the fuse circuit blows, before controlling the first switch or the second switch to close, the method further includes: It is determined that either the first battery pack or the second battery pack has malfunctioned; In the event that the fuse circuit has blown, controlling the first switch or the second switch to close includes: In the event that the fuse circuit blows and the first battery pack malfunctions, the second switch is controlled to close, thereby discharging the second battery pack; or... In the event that the fuse circuit blows and the second battery pack malfunctions, the first switch is controlled to close so that the first battery pack can be discharged.

6. The control method according to claim 1, characterized in that, When the battery system is in discharge mode, the control method further includes the following steps before the fuse circuit blows: The operating mode of the battery system is determined, including either a charging mode or a discharging mode.

7. The control method according to claim 2, characterized in that, The fuse circuit also includes a third switch connected in series with the fuse device, and the third switch is closed when the battery system is in discharge mode.

8. The control method according to claim 7, characterized in that, The control method further includes: When the battery system is in charging mode, determine the output voltage of the charging device; If the output voltage satisfies the series voltage of the first battery pack and the second battery pack, control the first switch and the second switch to open and control the third switch to close; or... When the output voltage cannot meet the series voltage of the first battery pack and the second battery pack, and the output voltage meets the voltage of either the first battery pack or the second battery pack, the first switch and the second switch are controlled to close and the third switch is controlled to open. When the battery system is in charging mode, the voltage difference between the first battery pack and the second battery pack is less than or equal to a preset voltage.

9. A battery system, characterized in that, The battery system includes: A battery device includes a first battery pack, a second battery pack, a first switch, a second switch, and a fuse circuit. The first positive terminal of the first battery pack is connected to the second positive terminal of the second battery pack in sequence through the first switch and a first node. The first negative terminal of the first battery pack is connected to the second negative terminal of the second battery pack in sequence through a second node and a second switch. One end of the fuse circuit is connected between the first positive terminal and the first switch, and the other end is connected between the second negative terminal and the second switch. The first node and the second node are used to connect a charging and discharging circuit. A battery management system, connected to the first switch and the second switch, the battery management system being used to perform the control method as described in any one of claims 1 to 8.

10. The battery system according to claim 9, characterized in that, The fuse circuit includes a fuse device.

11. The battery system according to claim 10, characterized in that, The fuse device includes an active trigger fuse device.

12. The battery system according to claim 10, characterized in that, The fuse is connected to the battery management system and is used to fuse the fuse through the battery management system.

13. The battery system according to any one of claims 10 to 12, characterized in that, The fuse circuit also includes a third switch connected in series with the fuse device, and the third switch is connected to the battery management system.

14. An electrical appliance, characterized in that, The electrical equipment includes: Load; and, The battery system as described in any one of claims 9 to 13, wherein the battery system is connected to the load for supplying power to the load.

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