Integrated battery system unit and battery system

Abstract

The present invention provides an integrated battery system unit and a battery system, wherein the integrated battery system unit comprises: at least one battery box including a plurality of battery cells connected in series and parallel; a battery management system connected to the battery box, used to collect the operating parameters of the battery box and estimate the state parameters, and issue control instructions; a high-voltage distribution box connected to the battery box and the battery management system, used to control the on-off of the battery box and the main circuit according to the control instructions transmitted by the battery management system, and control the input and removal of the integrated battery system unit; a thermal management system connected to the battery management system and the battery box, used to communicate with the battery management system to obtain the temperature of each battery cell in the battery box in real time, and adjust the temperature of the battery cells in the battery box according to the temperature. The present invention can reduce the space occupied by the system through integration, can be flexibly connected to or removed from the battery system, and does not affect the use of other integrated battery system units.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery management, and in particular relates to an integrated battery system unit and a battery system. Background Art

[0002] As the fastest growing energy storage mode, battery energy storage has the advantages of high energy density, high energy conversion efficiency, fast response speed, and high regulation accuracy. The existing large-capacity battery system has large installed batteries and needs to be equipped with a thermal management system and a fire protection system. Therefore, it occupies a large space, has low integration, and needs to customize each subsystem separately according to actual needs, which is costly and requires a large design workload. The existing battery system is usually equipped with only a single contactor in the main circuit to receive the main control signal to perform the on-off operation. If the main control fails or the contactor sticks, the main circuit cannot be disconnected in time, which is easy to cause a safety accident. In addition, the existing battery system is usually equipped with only a single fuse in the main circuit. If the main circuit current is too large and the single fuse cannot disconnect the circuit in time due to a fault, it is also easy to cause a safety accident. Once a fault occurs somewhere in the existing battery system and switches to the disconnected state, the battery system will not be able to maintain operation. In addition, once thermal runaway somewhere in the battery system triggers the battery system fire protection measures, the entire battery system is at risk of being scrapped, and its subsequent maintenance costs are high. Summary of the invention

[0003] The present invention provides an integrated battery system unit and a battery system to solve the problems that the existing battery system installation needs to be equipped with a thermal management system, occupies a large space, has a low integration, and the main circuit cannot be cut off in time when a main control fails.

[0004] Based on the above purpose, an embodiment of the present invention provides an integrated battery system unit, comprising: at least one battery box, wherein the battery box comprises a plurality of battery cells connected in series and parallel; a battery management system connected to the battery box, for collecting operating parameters of the battery box and estimating state parameters, and issuing control instructions; a high-voltage distribution box connected to the battery box and the battery management system, for receiving the control instructions transmitted by the battery management system, and controlling the connection and disconnection of the battery box and the main circuit according to the control instructions, and controlling the input and disconnection of the integrated battery system unit; a thermal management system connected to the battery management system and the battery box, for communicating with the battery management system to obtain the temperature of each battery cell in the battery box in real time, and adjust the temperature of the battery cells in the battery box according to the temperature.

[0005] Optionally, the integrated battery system unit also includes: a fire protection system, connected to the battery box and the battery management system, for monitoring the fire protection parameters in the battery box in real time, and obtaining the temperature of each battery cell in the battery box through the battery management system, and performing fire protection control according to the fire protection parameters and the temperature.

[0006] Optionally, the fire protection system includes: a fire protection controller, a fire protection sensor, a drive valve and a fire extinguishing agent tank. The fire protection sensor is arranged on the battery box for monitoring the fire protection parameters in the battery box in real time. The fire protection controller is connected to the fire protection sensor, the battery management system and the drive valve. The drive valve is also connected to the fire extinguishing agent tank. The fire protection controller receives the temperature of each battery cell in the battery box transmitted by the battery management system, and outputs a drive instruction to control the drive valve to open when it is judged that the battery box has thermal runaway according to the temperature and the fire protection parameters. The fire extinguishing agent in the fire extinguishing agent tank is passed into the battery box through the drive valve for fire extinguishing.

[0007] Optionally, the battery box also includes: a heating film, a first manual switch, a second manual switch, a first fuse and a water cooling plate; the two ends of the heating film are respectively connected to the positive pole and the negative pole of the high-voltage distribution box, the multiple series-parallel connected battery cells are connected in series between the first manual switch and the second manual switch, the first fuse is connected in series with the first manual switch, and the two ends of the water cooling plate are connected to the thermal management system.

[0008] Optionally, the high-voltage distribution box includes: a first contactor and a second contactor respectively connected to the positive pole and the negative pole of the main circuit, and the high-voltage distribution box controls the on and off of the first contactor and the second contactor according to the control instruction to complete the input and output of the integrated battery system unit.

[0009] Optionally, the high-voltage distribution box also includes: a third manual switch, a fourth manual switch, a second fuse and a third fuse; the third manual switch and the second fuse are connected in series between the battery box and the first contactor, and the fourth manual switch and the third fuse are connected in series between the battery box and the second contactor.

[0010] Optionally, the high-voltage distribution box also includes: a third contactor and a fourth contactor; the third contactor is connected between one end of the heating film and the first contactor, and the fourth contactor is connected between the other end of the heating film and the second contactor, and is used to control the heating film to start self-heating when the temperature of the battery cell is low.

[0011] Optionally, the high-voltage distribution box also includes: a current sensor, a voltage sensor and an insulation tester; the current sensor is connected in series with the first contactor to detect the current of the main circuit of the integrated battery system unit, the voltage sensor and the insulation tester are connected in parallel between the positive and negative circuits of the main circuit, the voltage sensor is used to detect the voltage of the main circuit of the integrated battery system unit, and the insulation tester is used to detect the insulation resistance value of the positive and negative bus bars of the integrated battery system unit to the ground and the positive and negative bus bar voltages.

[0012] Based on the same inventive concept, an embodiment of the present invention also proposes a battery system, including: a central management system, and a plurality of the aforementioned integrated battery system units connected in parallel to each other, each of the integrated battery system units being connected to a system bus via an electrical connection, and the central management system being connected to each of the integrated battery system units.

[0013] Optionally, the central management system is connected to a battery management system in the integrated battery system unit, and the battery management system monitors the operation of the integrated battery system unit and controls the integrated battery system unit to be connected to or disconnected from the system bus.

[0014] The beneficial effects of the present invention are as follows: as can be seen from the above, an integrated battery system unit and a battery system provided by an embodiment of the present invention, the integrated battery system unit comprises: at least one battery box comprising a plurality of battery cells connected in series and parallel; a battery management system connected to the battery box, a high-voltage distribution box and a thermal management system connected to the battery box and the battery management system, the battery management system collects the operating parameters of the battery box and estimates the state parameters, and issues control instructions; the high-voltage distribution box receives the control instructions transmitted by the battery management system, and controls the on-off of the battery box and the main circuit according to the control instructions, and controls the input and removal of the integrated battery system unit; the thermal management system communicates with the battery management system to obtain the temperature of each battery cell in the battery box in real time, and adjusts the temperature of the battery cells in the battery box according to the temperature, and can integrate the thermal management system into the integrated battery system unit, reduce the space occupied by the system through integration, and control the on-off of the battery box and the main circuit through the battery management system and the high-voltage distribution box, so as to control the flexible access or removal of the integrated battery system unit from the battery system without affecting the use of other integrated battery system units. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a schematic structural diagram of an integrated battery system unit in an embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of a battery box in an integrated battery system unit in an embodiment of the present invention;

[0018] Figure 3 It is a structural schematic diagram of a high-voltage distribution box in an integrated battery system unit in an embodiment of the present invention;

[0019] Figure 4 is a structural schematic diagram of a fire protection system in an integrated battery system unit in an embodiment of the present invention;

[0020] Figure 5 Schematic diagram of the structure of the battery system in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present invention do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] The embodiment of the present invention provides an integrated battery system unit. Figure 1As shown, the integrated battery system unit includes: at least one battery box 1, a high-voltage distribution box 2, a battery management system 3 and a thermal management system 4. The battery management system 3 is connected to the battery box 1, and is used to collect the operating parameters of the battery box 1 and estimate the state parameters, and issue control instructions; the high-voltage distribution box 2 is connected to the battery box 1 and the battery management system 3, and is used to receive the control instructions transmitted by the battery management system 3, and control the connection and disconnection of the battery box 1 and the main circuit according to the control instructions, and control the input and removal of the integrated battery system unit; the thermal management system 4 is connected to the battery management system 3 and the battery box 1, and is used to communicate with the battery management system 3 to obtain the temperature of each battery cell in the battery box 1 in real time, and adjust the temperature of the battery cell in the battery box 1 according to the temperature. In the embodiment of the present invention, the thermal management system 4 is integrated into the integrated battery system unit, and the space occupied by the system is reduced through integration; the connection and disconnection of the battery box 1 and the main circuit are controlled by the battery management system 3 and the high-voltage distribution box 2, and the integrated battery system unit can be flexibly connected or removed from the battery system without affecting the use of other integrated battery system units.

[0024] The integrated battery system unit also includes: a fire protection system 5, which is connected to the battery box 1 and the battery management system 3, and is used to monitor the fire protection parameters in the battery box 1 in real time, and obtain the temperature of each battery cell in the battery box 1 through the battery management system 3, and perform fire protection control according to the fire protection parameters and the temperature. The integrated battery system unit in the embodiment of the present invention integrates the battery box 1, the high-voltage distribution box 2, the battery management system 3, the thermal management system 4 and the fire protection system 5. The space occupied by the battery system is reduced through integration, and the space utilization rate is improved.

[0025] The structure of the battery box 1 is as follows Figure 2 As shown, the battery box 1 includes a plurality of battery cells 11 connected in series and parallel. The battery box 1 also includes: a heating film 12, a first manual switch 13, a second manual switch 14, a first fuse 15 and a water-cooled plate 16. The two ends of the heating film 12 are respectively connected to the positive electrode and the negative electrode of the high-voltage distribution box 2, the plurality of battery cells 11 connected in series and parallel are connected in series between the first manual switch 13 and the second manual switch 14, the first fuse 15 is connected in series with the first manual switch 13, and the two ends of the water-cooled plate 16 are connected to the thermal management system 4. The temperature control during the operation of the battery box 1 is achieved by heat exchange between the battery cell 11 and the coolant in the water-cooled plate 16. The first manual switch 13, the second manual switch 14 and the first fuse 15 of the battery box 1 can be equipped according to needs to improve maintenance and operation safety. Starting the heating film 12 in the battery box 1 can realize the low-temperature heating function of the battery.

[0026] The structure of high voltage distribution box 2 is as follows Figure 3 As shown, the high-voltage distribution box 2 includes: a first contactor 201 and a second contactor 202 respectively connected to the positive and negative poles of the main circuit 6, and the high-voltage distribution box 2 controls the on and off of the first contactor 201 and the second contactor 202 according to the control instruction to complete the input and removal of the integrated battery system unit. The on and off control of the integrated battery system unit and the battery system main circuit 6 is achieved by controlling the on and off states of the first contactor 201 connected to the positive pole of the main circuit 6 and the second contactor 202 connected to the negative pole of the main circuit 6, thereby realizing the input and removal of the integrated battery system unit. Compared with the single contactor design, this contactor redundancy design has the function of ensuring that the line can be normally cut off when a single contactor has an adhesion failure, thereby improving the safety of the battery system.

[0027] The high-voltage distribution box 2 also includes: a third manual switch 203, a fourth manual switch 204, a second fuse 205 and a third fuse 206; the third manual switch 203 and the second fuse 205 are connected in series between the battery box 1 and the first contactor 201, and the fourth manual switch 204 and the third fuse 206 are connected in series between the battery box 1 and the second contactor 202. Before working in the high-voltage distribution box 2, the third manual switch 203 connected to the positive main circuit of the main circuit 6 and the fourth manual switch 204 connected to the negative main circuit of the main circuit 6 need to be pulled out, so as to cut off the main circuit between the high-voltage distribution box 2 and the battery box 1, and ensure safety during maintenance. When the main circuit between the high-voltage distribution box 2 and the battery box 1 is overcurrent, the second fuse 205 and the third fuse 206 connected to the positive main circuit and the negative main circuit are cut off. The main circuit fuse also adopts a redundant design, and the second fuse 205 and the third fuse 206 are respectively set at the positive and negative poles of the main circuit to prevent the risk of circuit overcurrent and ensure the safety of the integrated battery system unit during operation.

[0028] The high-voltage distribution box 2 also includes: a third contactor 207 and a fourth contactor 208. The third contactor 207 is connected between one end of the heating film 12 and the first contactor 201, and the fourth contactor 208 is connected between the other end of the heating film 12 and the second contactor 202, and is used to control the heating film 12 to start self-heating when the temperature of the battery cell 11 is low. The third contactor 207 and the fourth contactor 208 are heating circuit on-off control contactors. When the battery management system 3 detects that the temperature of the battery cell 11 is lower than the temperature threshold, the third contactor 207 and the fourth contactor 208 are closed, and the battery cell 11 in the battery box 1 provides electrical energy to the heating film 12, thereby starting self-heating. Compared with the single contactor design, this contactor redundancy design also has the function of ensuring that the line can be cut off normally when a single contactor has an adhesion failure, thereby improving the safety of the battery system.

[0029] The high-voltage distribution box 2 also includes: a current sensor 209, a voltage sensor 210 and an insulation detector 211. The current sensor 209 is connected in series with the first contactor 201 to detect the current of the main circuit 6 of the integrated battery system unit. The voltage sensor 210 and the insulation detector 211 are connected in parallel between the positive and negative circuits of the main circuit 6. The voltage sensor 210 is used to detect the voltage of the main circuit 6 of the integrated battery system unit. The insulation detector 211 is used to detect the insulation resistance value of the positive and negative busbars of the integrated battery system unit to the ground and the positive and negative busbar voltages. The current sensor 209 and the voltage sensor 210 detect the voltage and current of the integrated battery system unit, and provide real-time voltage and current information for the battery management system 3, which is used for nuclear power status calculation and related protection functions.

[0030] The main components of the battery main circuit, such as fuses, contactors, etc., are placed inside the high-voltage distribution box 2, which has the functions of main circuit short-circuit protection and on-off switching between the integrated battery system unit and the load end.

[0031] The battery management system 3 is responsible for the collection of operating parameters of each battery cell 11, estimation of state parameters, logic control, fault diagnosis, system protection, data processing and storage, communication with the thermal management system and the fire protection system, and communication with the upper system. The battery management system collects operating parameters such as voltage, current, and temperature, estimates state parameters such as nuclear power state, peak power, and health state based on the operating parameters, uses the state parameters as control logic parameter input, and issues control instructions to enable each contactor and other actuators to perform control tasks.

[0032] The thermal management system 4 communicates with the battery management system 3 to obtain the temperature of each battery cell 11 in real time, and adjusts the flow and temperature of the refrigerant flowing through the water cooling plate 16 by controlling the speed of the compressor and water pump, the on / off state of the solenoid valve, etc., and changes the heat exchange between the refrigerant and the battery cell 11, ensuring that the temperature difference between each battery cell 11 is always within the allowable range during the charging and discharging process. The thermal management system 4 can switch between cooling and heating modes according to the temperature of the battery cell 11 and the temperature control requirements.

[0033] like Figure 4As shown, the fire fighting system 5 includes: a fire fighting controller 51, a fire fighting sensor 52, a driving valve 53 and a fire fighting agent tank 54. The fire fighting sensor 52 is arranged on the battery box 1 and is used to monitor the fire fighting parameters in the battery box 1 in real time. The fire fighting controller 51 is connected to the fire fighting sensor 52, the battery management system 3 and the driving valve 53. The driving valve 53 is also connected to the fire fighting agent tank 54. The fire fighting controller 51 receives the temperature of each battery cell 11 in the battery box 1 transmitted by the battery management system 3, and outputs a driving instruction to control the driving valve 53 to open when judging the thermal runaway of the battery box 1 according to the temperature and the fire fighting parameters. The fire fighting agent in the fire fighting agent tank 54 is passed into the battery box 1 through the driving valve 53 to extinguish the fire. The fire fighting sensor 52 installed on each battery box 1 monitors the fire fighting parameters such as the comprehensive combustion gas and smoke concentration and gas temperature in each battery box 1 in real time, and transmits the fire fighting parameters to the fire fighting controller 51. At the same time, the battery management system 3 transmits the temperature of each battery cell 11 obtained in real time to the fire fighting controller 51. When the fire controller 51 determines that a battery box 1 has thermal runaway according to the received fire parameters and temperature, the fire controller 51 sends a drive instruction to the corresponding drive valve 53, and the fire extinguishing agent in the fire extinguishing agent tank 54 is introduced into the thermal runaway battery box 1 through the fire pipeline to achieve the purpose of fire extinguishing.

[0034] The integrated battery system unit of the embodiment of the present invention may include a plurality of battery boxes connected in series, which constitute a battery cabinet. The integrated battery system unit realizes high integration, integrates a battery cabinet, a battery management system, a high-voltage distribution box, a thermal management system and a fire protection system, and improves space utilization. The integrated battery system unit has fuse redundancy protection and contactor redundancy protection functions, and has high safety. By setting devices such as fuses and contactors in the high-voltage distribution box, it has the functions of main circuit short-circuit protection and performing on-off switching between the integrated battery system unit and the load end, thereby realizing the unit redundancy function.

[0035] The integrated battery system unit of the embodiment of the present invention includes: at least one battery box including a plurality of battery cells connected in series and parallel; a battery management system connected to the battery box, a high-voltage distribution box and a thermal management system connected to the battery box and the battery management system, the battery management system collects operating parameters of the battery box and estimates state parameters, and issues control instructions; the high-voltage distribution box receives the control instructions transmitted by the battery management system, and controls the connection and disconnection of the battery box and the main circuit according to the control instructions, and controls the input and removal of the integrated battery system unit; the thermal management system communicates with the battery management system to obtain the temperature of each battery cell in the battery box in real time, and adjusts the temperature of the battery cells in the battery box according to the temperature, so that the thermal management system can be integrated into the integrated battery system unit, and the system occupancy space can be reduced through integration. The connection and disconnection of the battery box and the main circuit can be controlled by the battery management system and the high-voltage distribution box, and the integrated battery system unit can be flexibly connected or removed from the battery system without affecting the use of other integrated battery system units.

[0036] Based on the same concept, an embodiment of the present invention also provides a battery system. Figure 5 As shown, the battery system includes: a central management system, a plurality of the aforementioned integrated battery system units connected in parallel, each of the integrated battery system units is connected to the system busbar through an electrical connection, and the central management system is connected to each of the integrated battery system units. The central management system can flexibly configure the number of integrated battery system units and the series-parallel connection of the integrated battery system units to form the battery system according to the actual power and capacity requirements. The positive and negative poles of the main circuit are drawn out from the high-voltage distribution box of each integrated battery system unit and connected to the system busbar through electrical connectors. Figure 5 Where N is a positive integer.

[0037] The central management system is connected to the battery management system in the integrated battery system unit, and the integrated battery system unit is monitored through the battery management system, and the integrated battery system unit is controlled to be put into the system bus or cut off from the system bus. As the top-level control center of the system, the central control unit is responsible for the operation process monitoring of the entire system, system logic control and protection, and communication with external systems. This is a unit redundancy design. During the use of the battery system, each integrated battery system unit can be independent of each other. If any integrated battery system unit fails and causes the integrated battery system unit to be disconnected from the load, it will not affect the use of other integrated battery system units, and the battery system can be maintained. Operation; if any integrated battery system unit is damaged or fire-fighting measures are triggered due to thermal runaway, other integrated battery system units are independent of the integrated battery system unit, and only the damaged integrated battery system unit needs to be replaced, which greatly reduces the maintenance cost. In addition, the mass production of integrated battery system units can greatly reduce the design workload and manufacturing costs.

[0038] For the convenience of description, the above device is described as various modules according to their functions. Of course, when implementing the embodiment of the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0039] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. Based on the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of simplicity.

[0040] This application is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the embodiments of the present invention. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the scope of protection of this application.

Claims

1. An integrated battery system unit, characterized in that: The integrated battery system unit comprises: At least one battery box, the battery box comprising a plurality of battery cells connected in series and parallel; A battery management system, connected to the battery box, for collecting operating parameters of the battery box, estimating state parameters, and issuing control instructions; A high-voltage distribution box, connected to the battery box and the battery management system, for receiving the control instructions transmitted by the battery management system, and controlling the connection and disconnection of the battery box and the main circuit according to the control instructions, and controlling the input and disconnection of the integrated battery system unit; A thermal management system connected to the battery management system and the battery box, and configured to communicate with the battery management system to obtain the temperature of each battery cell in the battery box in real time, and to adjust the temperature of the battery cells in the battery box according to the temperature; The battery box further includes: a heating film, a first manual switch, a second manual switch, a first fuse and a water cooling plate; the two ends of the heating film are respectively connected to the positive electrode and the negative electrode of the high-voltage distribution box, the plurality of battery cells connected in series and parallel are connected in series between the first manual switch and the second manual switch, the first fuse is connected in series with the first manual switch, and the two ends of the water cooling plate are connected to the thermal management system; The high-voltage distribution box comprises: a first contactor and a second contactor respectively connected to the positive electrode and the negative electrode of the main circuit, and the high-voltage distribution box controls the on-off of the first contactor and the second contactor according to the control instruction to complete the input and removal of the integrated battery system unit; The high-voltage distribution box further includes: a third manual switch, a fourth manual switch, a second fuse and a third fuse; the third manual switch and the second fuse are connected in series between the battery box and the first contactor, and the fourth manual switch and the third fuse are connected in series between the battery box and the second contactor; The high-voltage distribution box also includes: a third contactor and a fourth contactor; the third contactor is connected between one end of the heating film and the first contactor, and the fourth contactor is connected between the other end of the heating film and the second contactor, and is used to control the heating film to start self-heating when the temperature of the battery cell is low.

2. The integrated battery system unit according to claim 1, characterized in that: The integrated battery system unit also includes: a fire protection system, which is connected to the battery box and the battery management system, and is used to monitor the fire protection parameters in the battery box in real time, and obtain the temperature of each battery cell in the battery box through the battery management system, and perform fire protection control according to the fire protection parameters and the temperature.

3. The integrated battery system unit according to claim 2, characterized in that: The fire fighting system includes: a fire fighting controller, a fire fighting sensor, a driving valve and a fire extinguishing agent tank. The fire fighting sensor is arranged on the battery box and is used to monitor the fire fighting parameters in the battery box in real time. The fire fighting controller is connected to the fire fighting sensor, the battery management system and the driving valve. The driving valve is also connected to the fire extinguishing agent tank. The fire fighting controller receives the temperature of each battery cell in the battery box transmitted by the battery management system, and outputs a driving instruction to control the driving valve to open when judging the thermal runaway of the battery box according to the temperature and the fire fighting parameters. The fire extinguishing agent in the fire extinguishing agent tank is passed into the battery box through the driving valve to extinguish the fire.

4. The integrated battery system unit according to claim 1, characterized in that: The high-voltage distribution box also includes: a current sensor, a voltage sensor and an insulation tester; the current sensor is connected in series with the first contactor to detect the current of the main circuit of the integrated battery system unit, the voltage sensor and the insulation tester are connected in parallel between the positive and negative circuits of the main circuit, the voltage sensor is used to detect the voltage of the main circuit of the integrated battery system unit, and the insulation tester is used to detect the insulation resistance value of the positive and negative busbars of the integrated battery system unit to the ground and the positive and negative busbar voltages.

5. A battery system, characterized in that: The battery system comprises: a central management system, and a plurality of integrated battery system units as described in any one of claims 1 to 4 connected in parallel with each other, each of the integrated battery system units being connected to a system bus via an electrical connection, and the central management system being connected to each of the integrated battery system units.

6. The battery system according to claim 5, characterized in that: The central management system is connected to the battery management system in the integrated battery system unit, and the battery management system monitors the operation of the integrated battery system unit and controls the integrated battery system unit to be put into the system bus or removed from the system bus.

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