Battery cabinet

Abstract

The utility model provides a battery cabinet which is characterized in that a plurality of large horizontal batteries are arranged on a shelf in a cabinet body. An injection and drainage port of the battery is connected to the injection and drainage branch pipe and the injection and drainage main pipe, a normally open valve is arranged at the injection and drainage port of the battery, a pressure sensor and an electromagnetic valve are arranged on the injection and drainage branch pipe, the pressure in the battery can be detected by utilizing the pressure sensor, and a safener can be injected into the battery or normally produced gas in the battery can be discharged by opening the electromagnetic valve. The explosion-proof port of the battery is connected to the explosion-proof branch pipe and the waste discharge barrel, the one-way pressure valve is arranged at the explosion-proof port of the battery, and when the pressure in the battery is too large due to the failure of the battery, the one-way pressure valve is automatically opened, so that combustible gas, electrolyte and the like in the battery are discharged into the waste discharge barrel. The battery cabinet is low in cost, simple in structure, convenient to mount and high in space utilization rate in the battery cabinet, has battery maintenance and safety functions, and can prolong the service life and improve the safety performance of the battery.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, and particularly to a battery cabinet. Background Art

[0002] Energy storage is an important supporting technology for the large-scale development of new energy. New energy + energy storage will be an important technological and industrial direction in the next decade. Lithium-ion batteries are new high-energy batteries with lithium-inserted compounds as the positive and negative electrode materials. Currently, electrochemical energy storage based on lithium-ion batteries is one of the most widely used energy storage forms. Lithium batteries for energy storage generally first connect single cells in series into modules, and several modules are arranged in a cluster, and are connected in parallel as a battery array in the form of a battery cabinet or a battery rack, and are connected to the grid or directly output for application after busbar connection and power conversion. However, the design, daily maintenance and safety issues of the battery cabinet for large batteries still need to be urgently solved, and technological innovation and breakthroughs are required. Summary of the Utility Model

[0003] In view of the above problems, the utility model provides a battery cabinet, in which a plurality of large horizontal batteries are placed on a shelf in the cabinet. The injection and discharge ports of the battery are connected to an injection and discharge branch pipe and an injection and discharge main pipe. A normally open valve is provided at the injection and discharge port of the battery. A pressure sensor and a solenoid valve are provided on the injection and discharge branch pipe. The pressure sensor can be used to detect the pressure inside the battery, and the solenoid valve can be opened to inject a safety agent into the battery or discharge the normal gas generated inside the battery. The explosion-proof port of the battery is connected to an explosion-proof branch pipe and a waste discharge cylinder. A one-way pressure valve is provided at the explosion-proof port of the battery. When the pressure inside the battery is too high due to a fault, the one-way pressure valve automatically opens, so that the combustible gas, electrolyte, etc. inside the battery are discharged into the waste discharge cylinder. The battery cabinet has low cost, simple structure, convenient installation, high space utilization rate inside the battery cabinet, and has battery maintenance and safety functions, which can improve the service life and safety performance of the battery.

[0004] The technical solution provided by the utility model is as follows:

[0005] According to the present utility model, a battery cabinet is provided. The battery cabinet includes a cabinet body, a shelf, a plurality of batteries, a pipeline system, and a safety control unit. The shelf is placed inside the cabinet body, and the plurality of batteries are respectively placed on the shelf. Each battery is provided with a fluid injection / discharge port for injecting and discharging fluid and an explosion-proof port for discharging fluid. A normally open valve is provided at the fluid injection / discharge port, and a one-way pressure valve is provided at the explosion-proof port. The pipeline system includes an injection / discharge main pipe, a plurality of injection / discharge branch pipes, an exhaust pipe, a safety agent pipe, a waste discharge barrel, a plurality of explosion-proof branch pipes, and a liquid discharge pipe. One end of the injection / discharge branch pipe is communicated with the injection / discharge main pipe, and the other end of the injection / discharge branch pipe is connected to the fluid injection / discharge port of the battery. An electromagnetic valve and a pressure sensor for detecting the pressure inside the battery are provided on the injection / discharge branch pipe. The injection / discharge main pipe is connected to the safety agent pipe, and the safety agent pipe is connected to a safety agent storage tank outside the battery cabinet. The safety agent can be injected into the battery through the safety agent pipe, the injection / discharge main pipe, the injection / discharge branch pipe, and the fluid injection / discharge port of the battery. The injection / discharge main pipe is also connected to the exhaust pipe, and the gas generated inside the battery can be discharged out of the battery cabinet through the fluid injection / discharge port of the battery, the injection / discharge branch pipe, the injection / discharge main pipe, and the exhaust pipe. One end of the explosion-proof branch pipe is communicated with the waste discharge barrel, and the other end of the explosion-proof branch pipe is connected to the explosion-proof port of the battery. The lower part of the waste discharge barrel is connected to the liquid discharge pipe for discharging the liquid in the waste discharge barrel out of the battery cabinet, and the upper part of the waste discharge barrel is provided with an exhaust port for discharging the gas in the waste discharge barrel out of the battery cabinet. The safety control unit can receive the signal of the pressure sensor, open or close the electromagnetic valve, and communicate with other energy storage management systems. Specifically, a normally open valve is provided at the fluid injection / discharge port of the battery. The injection / discharge branch pipe is connected to the fluid injection / discharge port. The pressure sensor is arranged at a position on the injection / discharge branch pipe close to the fluid injection / discharge port, and the electromagnetic valve is arranged at a position on the injection / discharge branch pipe slightly away from the fluid injection / discharge port. Since the injection / discharge branch pipe is communicated with the inside of the battery, the pressure sensor can be used to detect the pressure inside the battery. The part of the injection / discharge branch pipe between the pressure sensor and the fluid injection / discharge port can adopt an inverted "U" shape structure, so that the pressure sensor can not only detect the air pressure inside the battery, but also will not be corroded by the electrolyte inside the battery. It should be pointed out here that the pressure sensor can also be arranged inside the battery. The data detected by the pressure sensor can be transmitted to the safety control unit, and the safety control unit controls the opening and closing of the electromagnetic valve on the injection / discharge branch pipe for the normal exhaust of the battery usually and injecting the safety agent into the battery when the battery fails. When the battery fails, the pressure inside the battery will increase rapidly, causing the one-way pressure valve at the explosion-proof port of the battery to open. At this time, while injecting the safety agent into the battery through the injection / discharge branch pipe, a large amount of gas, electrolyte, and other liquids generated inside the battery will be discharged through the one-way pressure valve at the explosion-proof port. The safety agent storage tank can be arranged outside the battery cabinet. The safety agent storage tank is connected to the safety agent pipe, and the safety agent in the safety agent storage tank can be injected into the faulty battery by using a liquid pump, high-pressure gas, etc.The safety agent can be one or more of carbon dioxide, nitrogen, argon, helium, sulfur dioxide, heptafluoropropane, 1,1,1,2,3,3,3-heptafluoro-2-methyl-3-pentanone, etc.; or one or more of alkyl phosphate esters, aromatic phosphate esters, phosphite esters, phosphazenes, phosphorus-halogen organic compounds, tricresyl phosphate, dimethyl methylphosphonate, hexamethylphosphoramide, tetrabromobisphenol, phosphaphenanthrene derivatives, nitrogen-phosphorus ene additives, and phosphazene compounds, etc.; or water, silicone oil, dry powder fire extinguishing agent, foam fire extinguishing agent or aerosol fire extinguishing agent, etc. Through the pipeline system and valve settings of the battery cabinet, the routine maintenance of the battery and the elimination of potential safety hazards of faulty batteries can be achieved in a simple, reliable and low-cost manner.

[0006] When the pressure sensor detects that the pressure inside the battery reaches the first threshold, the safety control unit controls the solenoid valve on the injection and drainage branch pipe to open for the routine exhaust of the battery; when the pressure inside the battery reaches the second threshold, the one-way pressure valve of the battery automatically opens to discharge the gas and liquid inside the battery into the waste discharge cylinder, and the safety agent is injected into the battery through the safety agent pipe, injection and drainage main pipe, injection and drainage branch pipe and the injection and drainage port of the battery. The second threshold is greater than the first threshold. The first threshold of the pressure inside the battery can be 5 - 200 kPa, and the second threshold of the pressure inside the battery can be 10 - 300 kPa. That is to say, when the pressure inside the battery reaches the first threshold, the solenoid valve on the injection and drainage branch pipe opens, and the gas inside the battery enters the injection and drainage main pipe through the injection and drainage port and the injection and drainage branch pipe, and then is discharged from the battery cabinet through the exhaust pipe connected to the injection and drainage main pipe. The exhaust pipe can include a first exhaust pipe and a second exhaust pipe. The first exhaust pipe can be connected to the upper part of the injection and drainage main pipe, and the second exhaust pipe can be connected to the lower part of the injection and drainage main pipe to quickly discharge the gas in the injection and drainage main pipe. When the pressure inside the battery reaches the second threshold, the injection and drainage port, the injection and drainage branch pipe and the injection and drainage main pipe are no longer used for gas discharge but for injecting the safety agent into the battery. At this time, the pressure inside the battery reaches the value to open the one-way pressure valve of the explosion-proof port, causing the one-way pressure valve of the explosion-proof port to open, and fluids such as combustible gas and electrolyte inside the battery are discharged through the explosion-proof port, explosion-proof branch pipe and waste discharge cylinder.

[0007] In addition to judging the injection timing of the safety agent by the pressure inside the battery, it can also be judged by other methods or a combination of multiple methods. For example, a temperature sensor can be provided on the injection and drainage branch pipe. When the temperature sensor detects that the temperature inside the battery exceeds a predetermined value, the safety control unit controls the solenoid valve on the injection and drainage branch pipe to open to inject the safety agent into the battery.

[0008] The battery can be a large horizontal battery. The length of the large horizontal battery can be approximately 300 mm to 1500 mm, the width can be approximately 200 mm to 500 mm, and the height can be approximately 50 mm to 200 mm. One battery is placed on each layer of the shelf, and 16 to 24 batteries can be placed in each battery cabinet. The battery includes opposite first and second sides. A filling and discharging port is provided on the first side of the battery. Multiple batteries are arranged vertically on the shelf such that the filling and discharging ports on the first sides of the multiple batteries are vertically aligned; an explosion-proof port is provided on the second side of the battery. Multiple batteries are arranged vertically on the shelf such that the explosion-proof ports on the second sides of the multiple batteries are vertically aligned. The cabinet body includes a first cabinet door on the same side as the first side of the battery and a second cabinet door on the same side as the second side of the battery. The relatively arranged first and second cabinet doors can facilitate operations such as installation and maintenance inside the battery cabinet from the front and back sides.

[0009] The battery cabinet includes a top plate, and a fire extinguishing device is provided on the lower surface of the top plate of the battery cabinet. The fire extinguishing device can be controlled to be turned on by a safety control unit. To save space, the safety control unit can be installed on the first cabinet door or the second cabinet door. The fire extinguishing device is filled with a fire extinguishing agent. When the abnormal gas production pressure or temperature inside the battery still cannot be reduced after the operations of exhausting gas and injecting a safety agent for the faulty battery, the fire extinguishing device can be turned on. On the basis of ensuring the intrinsic safety of the battery cabinet by using the safety agent, the fire extinguishing device can further improve the safety of the entire battery cabinet.

[0010] The cabinet body includes a first cabinet wall and a second cabinet wall located on the side. The filling and discharging main pipe and the filling and discharging branch pipes are close to the filling and discharging ports of the battery and are located in the space between the first cabinet wall and the shelf. The explosion-proof branch pipes and the waste discharge cylinder are close to the explosion-proof ports of the battery and are located in the space between the second cabinet wall and the shelf. That is to say, the front and back of the battery cabinet body are the first and second cabinet doors, and the left and right sides are the first and second cabinet walls. The shelf is located in the middle of the battery cabinet. There is a certain space between the shelf and the first cabinet wall, and there is also a certain space between the shelf and the second cabinet wall, which can be used for the laying of pipelines, so that the space inside the battery cabinet can be effectively utilized.

[0011] In the battery cabinet, a waste discharge cylinder is used instead of an ordinary pipeline. The waste discharge cylinder with a rectangular cross-section, for example, can be set according to the internal space size of the battery cabinet, which can not only meet the requirements of large discharge capacity but also fully save the internal space of the battery cabinet. A shutter can be provided at the exhaust port of the waste discharge cylinder. The shutter is fixedly connected to the exhaust port of the waste discharge cylinder. The cabinet body is provided with an air port. The shutter is opposite to the air port of the cabinet body and can be fixedly connected to the air port. The gas discharged from the battery to the waste discharge cylinder can be discharged from the battery cabinet through the air port of the cabinet body, and the shutter can prevent foreign objects outside the battery cabinet from entering the waste discharge cylinder. The total cross-sectional area of the waste discharge cylinder can be 100 to 500 cm 2, the total volume can be 20 to 50 L. Preferably, the cross-section of the waste discharge cylinder is rectangular, the length of the cross-section of the rectangle is 90 to 350 mm, and the width is 30 to 150 mm.

[0012] The battery is also provided with a coolant injection port and a coolant discharge port. The pipeline system also includes a coolant injection main pipe, a plurality of coolant injection branch pipes, a coolant discharge main pipe, and a plurality of coolant discharge branch pipes. One end of the coolant injection branch pipe is communicated with the coolant injection main pipe and the other end is connected to the coolant injection port of the battery. One end of the coolant discharge branch pipe is communicated with the coolant discharge main pipe and the other end is connected to the coolant discharge port of the battery. Through the coolant injection port of the battery, the coolant discharge port and the coolant pipeline inside the battery, the inside of the battery can be directly cooled, so as to realize the efficient and rapid cooling of the battery. The coolant injection main pipe, the coolant injection branch pipes, the coolant discharge main pipe, and the coolant discharge branch pipes can also be arranged in the space between the shelf and the first cabinet wall and between the shelf and the second cabinet wall.

[0013] A plurality of batteries are electrically connected through connecting flexible buses and led out through positive and negative busbars. An outlet end is provided on the first cabinet wall or the second cabinet wall. One end of the outlet end can be electrically connected to the busbar, and the other end is connected to the cable or busbar of other battery cabinets, and can be used for the electrical connection of adjacent battery cabinets. An outlet cable is provided at the bottom of the cabinet body. The outlet cable can be electrically connected to the pole busbar of other battery cabinets and can be used for the electrical connection of adjacent battery cabinets. The batteries in the battery cabinet can be connected in series through connecting flexible buses and then electrically connected to the outlet end or the outlet cable through the busbar. The series connection between multiple battery cabinets can be realized through the electrical connection of the outlet ends or the outlet cables of multiple battery cabinets. Preferably, the outlet end is arranged on the first cabinet wall or the second cabinet wall of the battery cabinet. Fuses, manual maintenance switches, etc. can also be arranged on the first cabinet wall or the second cabinet wall.

[0014] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention.

[0015] The advantages of the present invention are as follows:

[0016] 1) Through the combined design of the pipeline system and the valve, the routine maintenance of the battery and the elimination of potential safety hazards of the faulty battery can be realized in a simple, reliable and low-cost manner;

[0017] 2) Each battery is equipped with sensors and solenoid valves. In combination with the safety control unit, pipeline system, and valves, independent safety control of each battery can be achieved.

[0018] 3) The gas generated by the faulty battery can be discharged outside the cabinet in a timely manner, reducing the risk of accumulation and deflagration of combustible gases inside the cabinet. The safety agent can directly act on the inside of the faulty battery to eliminate the hidden danger of thermal runaway. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the cabinet body and shelf of the battery cabinet;

[0020] Figure 2 It is an overall schematic diagram of the battery cabinet;

[0021] Figures 3(a) and 3(b) are schematic diagrams of the battery and pipeline system of the battery cabinet.

[0022] List of Reference Numerals

[0023] 1 - Cabinet body

[0024] 101 - First cabinet door

[0025] 102 - Second cabinet door

[0026] 103 - First cabinet wall

[0027] 104 - Second cabinet wall

[0028] 105 - Top plate

[0029] 106 - Bottom plate

[0030] 2 - Safety control unit

[0031] 3 - Battery management unit

[0032] 4 - Lead-out terminal

[0033] 5 - Air port

[0034] 6 - Support part

[0035] 7 - Shelf

[0036] 8 - Battery

[0037] 801 - Injection and drainage port

[0038] 802 - Explosion-proof port

[0039] 9 - Pipeline system

[0040] 901 - Injection and drainage branch pipe

[0041] 902 - Injection and drainage main pipe

[0042] 903 - Safety agent pipe

[0043] 904 - First exhaust pipe

[0044] 905 - Second exhaust pipe

[0045] 906 - Explosion-proof branch pipe

[0046] 907 - Waste discharge cylinder

[0047] 908 - Drain pipe

[0048] 909 - Coolant injection branch pipe

[0049] 910 - Coolant discharge branch pipe

[0050] 911 - Coolant injection main pipe

[0051] 912 - Coolant discharge main pipe

[0052] 11 - Connecting flexible busbar

[0053] 12 - Busbar for current collection

[0054] 13 - Normally open valve

[0055] 14 - Solenoid valve

[0056] 15 - Check valve

[0057] 16 - Pressure sensor

[0058] 17 - Louver Detailed implementation manners

[0059] The present utility model will be further described below with reference to the accompanying drawings and through embodiments.

[0060] Figure 1 It is a schematic diagram of the cabinet body and shelf of the battery cabinet. As Figure 1As shown in the figure, the cabinet body 1 includes a first cabinet door 101, a second cabinet door (not shown in the figure), a first cabinet wall 103, a second cabinet wall 104, a top plate 105 and a bottom plate 106. A safety control unit 2, a battery management unit 3, etc. can be installed on the first cabinet door 101 or the second cabinet door. A lead-out terminal 4, etc. can be installed on the first cabinet wall 103 or the second cabinet wall 104. An air port 5 can be provided on the first cabinet wall 103 or the second cabinet wall 104 for docking with the exhaust port of the waste discharge cylinder. A support portion 6 can be provided below the bottom plate 106, and pipelines connected to the outside of the battery cabinet can be arranged in the support portion 6. A shelf 7 is provided in the cabinet body 1, and each layer of the shelf 7 can be used to place a battery. A space is formed between the left side surface of the shelf 7 and the first cabinet wall 103, and a space is formed between the right side surface of the shelf 7 and the second cabinet wall 104. A pipeline system can be arranged in the space formed between the shelf and the cabinet wall.

[0061] Figure 2 It is an overall schematic diagram of the battery cabinet. The battery cabinet includes a cabinet body 1, a shelf, a plurality of batteries 8, a pipeline system 9, a safety control unit 2, etc. The plurality of batteries 8 are placed on the shelf. A filling and discharging port is provided on the first side surface of the battery 8. The first side surface of the battery 8 and the first cabinet door 101 of the cabinet body are on the same side. An explosion-proof port is provided on the second side surface of the battery 8. The second side surface of the battery 8 and the second cabinet door 102 of the cabinet body are on the same side. The batteries 8 are electrically connected by a connecting flexible bus 11, and a busbar 12 electrically connects the batteries 8 to the lead-out terminal 4. Filling and discharging branch pipes, filling and discharging main pipes, safety agent pipes, exhaust pipes, etc. can be arranged in the space between the left side surface of the shelf and the first cabinet wall 103, and explosion-proof branch pipes, waste discharge cylinders, liquid discharge pipes, etc. can be arranged in the space between the right side surface of the shelf and the second cabinet wall 104. Through the design of opening doors from the front and back, operations such as installation and maintenance of the batteries, pipelines, circuits, etc. can be conveniently carried out from both the front and back sides.

[0062] Figures 3(a) and 3(b) are schematic diagrams of the battery and pipeline system of the battery cabinet. As shown in Figure 3(a), a normally open valve 13 is provided at the injection / discharge port 801 of the battery. One end of the injection / discharge branch pipe 901 is connected to the injection / discharge port 801 of the battery. A pressure sensor 16 and a solenoid valve 14 are provided on the injection / discharge branch pipe 901. The other end of the injection / discharge branch pipe 901 is connected to the injection / discharge main pipe 902. The injection / discharge main pipe 902 is respectively connected to a safety agent pipe 903 for injecting a safety agent, a first exhaust pipe 904 and a second exhaust pipe 905 for exhausting gas. Solenoid valves may be provided on the safety agent pipe 903, the first exhaust pipe 904 and the second exhaust pipe 905. The safety agent pipe 903 is connected to a safety agent storage tank outside the battery cabinet. As shown in Figure 3(b), a one-way pressure valve 15 is provided at the explosion-proof port 802 of the battery. One end of the explosion-proof branch pipe 906 is connected to the explosion-proof port 802. The other end of the explosion-proof branch pipe 906 is connected to a waste discharge cylinder 907. The lower part of the waste discharge cylinder 907 is connected to a liquid discharge pipe 908 for discharging liquid. An exhaust port for exhausting gas is provided at the upper part of the waste discharge cylinder 907, and a louver 17 may be installed on the exhaust port. The pipeline system may further include a coolant injection branch pipe 909, a coolant discharge branch pipe 910, a coolant injection main pipe 911 and a coolant discharge main pipe 912. One end of the coolant injection branch pipe 909 is connected to the coolant injection port of the battery. The other end of the coolant injection branch pipe 909 is connected to the coolant injection main pipe 911. The coolant injection main pipe 911 is connected to a cooling system outside the battery cabinet. One end of the coolant discharge branch pipe 910 is connected to the coolant discharge port of the battery. The other end of the coolant discharge branch pipe 910 is connected to the coolant discharge main pipe 912. The coolant discharge main pipe 912 is also connected to a cooling system outside the battery cabinet.

[0063] During the normal gas production process of the battery, when the pressure sensor 16 detects that the pressure inside the battery reaches the first threshold, the safety control unit controls the solenoid valve 14 on the injection and discharge branch pipe 901 and the solenoid valve on the exhaust pipe to open, so that the gas inside the battery is discharged outside the battery cabinet through the injection and discharge branch pipe 901, the injection and discharge main pipe 902, the first exhaust pipe 904 and the second exhaust pipe 905, thereby realizing the daily maintenance of the battery. In the case of a battery failure, when the pressure sensor 16 detects that the pressure inside the battery reaches the second threshold, the safety control unit controls the solenoid valve on the exhaust pipe to close, controls the solenoid valves on the safety agent pipe 903 and the injection and discharge branch pipe 901 to open. At this time, the one-way pressure valve 15 of the battery automatically opens due to the reached pressure value, so that the combustible gas, electrolyte, etc. inside the battery are discharged through the explosion-proof branch pipe 906, the waste discharge cylinder 907, the exhaust port and the drain pipe 908, and the safety agent is injected into the battery through the safety agent pipe 903, the injection and discharge main pipe 902, and the injection and discharge branch pipe 901, thereby eliminating the safety hazards of the faulty battery and preventing the combustion and explosion of the faulty battery. After the safety agent is injected into the faulty battery, the gas production gradually decreases, the pressure inside the battery drops, and the one-way pressure valve 15 at the explosion-proof port 802 automatically closes. At this time, the solenoid valve of the safety agent pipe 903 can be closed and the normally open valve 13 at the battery injection and discharge port can be closed, and then the faulty battery can be taken out of the battery cabinet.

[0064] The specific embodiments of the present invention are not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A battery cabinet, characterized in that: The battery cabinet includes a cabinet body, a shelf, a plurality of batteries, a piping system and a safety control unit. The shelf is placed in the cabinet body, and the plurality of batteries are placed on the shelf respectively. Each battery is provided with an injection and discharge port for injecting and discharging fluid and an explosion-proof port for discharging fluid. A normally open valve is provided at the injection and discharge port, and a one-way pressure valve is provided at the explosion-proof port. The piping system includes an injection and discharge main pipe, a plurality of injection and discharge branch pipes, an exhaust pipe, a safety agent pipe, a waste discharge cylinder, a plurality of explosion-proof branch pipes and a liquid discharge pipe. One end of the injection and discharge branch pipe is connected to the injection and discharge main pipe and the other end of the injection and discharge branch pipe is connected to the injection and discharge port of the battery. An electromagnetic valve and a pressure sensor for detecting the pressure inside the battery are provided on the injection and discharge branch pipe. The injection and discharge main pipe is connected to the safety agent pipe and the safety agent pipe is connected to the outside of the battery cabinet. The battery cabinet is provided with a safety agent storage tank, and the safety agent can be injected into the battery via the safety agent pipe, the injection and discharge main pipe, the injection and discharge branch pipe, and the injection and discharge port of the battery; the injection and discharge main pipe is connected to the exhaust pipe, and the gas generated in the battery can be discharged out of the battery cabinet via the injection and discharge port of the battery, the injection and discharge branch pipe, the injection and discharge main pipe, and the exhaust pipe; one end of the explosion-proof branch pipe is connected to the waste discharge barrel and the other end of the explosion-proof branch pipe is connected to the explosion-proof port of the battery; the lower part of the waste discharge barrel is connected to the drain pipe for discharging the liquid in the waste discharge barrel out of the battery cabinet; the upper part of the waste discharge barrel is provided with an exhaust port for discharging the gas in the waste discharge barrel out of the battery cabinet; the safety control unit can receive the signal of the pressure sensor and open or close the solenoid valve.

2. The battery cabinet according to claim 1, characterized in that: When the pressure sensor detects that the pressure in the battery reaches a first threshold, the safety control unit controls the solenoid valve on the injection and discharge branch pipe to open for normal exhaust of the battery; when the pressure in the battery reaches a second threshold, the one-way pressure valve of the battery automatically opens to discharge the gas and liquid in the battery into a waste discharge barrel, and the safety agent is injected into the battery via the safety agent pipe, the injection and discharge main pipe, the injection and discharge branch pipe and the injection and discharge port of the battery, the second threshold is greater than the first threshold, the first threshold of the pressure in the battery is 5 to 200 kPa, and the second threshold of the pressure in the battery is 10 to 300 kPa.

3. The battery cabinet according to claim 1, characterized in that: The exhaust pipe includes a first exhaust pipe and a second exhaust pipe, wherein the first exhaust pipe is connected to the upper portion of the injection and discharge main pipe, and the second exhaust pipe is connected to the lower portion of the injection and discharge main pipe, for exhausting the gas in the injection and discharge main pipe.

4. The battery cabinet according to claim 1, characterized in that: A temperature sensor is provided on the injection and discharge branch pipe. When the temperature sensor detects that the temperature inside the battery exceeds a predetermined value, the safety control unit controls the electromagnetic valve to open so as to inject a safety agent into the battery.

5. The battery cabinet according to claim 1, characterized in that: The battery comprises a first side and a second side facing each other, the injection and discharge port is arranged on the first side of the battery, the multiple batteries are arranged up and down on the shelf so that the injection and discharge ports on the first side of the multiple batteries are aligned up and down, the explosion-proof port is arranged on the second side of the battery, the multiple batteries are arranged up and down on the shelf so that the explosion-proof ports on the second side of the multiple batteries are aligned up and down, and the cabinet comprises a first cabinet door on the same side as the first side of the battery and a second cabinet door on the same side as the second side of the battery.

6. The battery cabinet according to claim 5, characterized in that: The battery cabinet includes a top plate, and a fire extinguishing device is provided on the lower surface of the top plate of the battery cabinet. The fire extinguishing device is controlled to be turned on by the safety control unit, and the safety control unit is installed on the first cabinet door or the second cabinet door.

7. The battery cabinet according to claim 1, characterized in that: The cabinet body includes a first cabinet wall and a second cabinet wall located on the side, the injection and discharge main pipe and the injection and discharge branch pipe are close to the injection and discharge ports of the battery and are located in the space between the first cabinet wall and the shelf, and the explosion-proof branch pipe and the waste discharge barrel are close to the explosion-proof port of the battery and are located in the space between the second cabinet wall and the shelf.

8. The battery cabinet according to claim 1, characterized in that: A shutter is provided at the exhaust port of the waste discharge tube, and the shutter is fixedly connected to the exhaust port of the waste discharge tube. The cabinet is provided with an air port, and the shutter is opposite to the air port of the cabinet and can be fixedly connected to the air port.

9. The battery cabinet according to claim 1, characterized in that: The cross section of the waste discharge barrel is rectangular, the length of the rectangular cross section is 90 to 350 mm, and the width is 30 to 150 mm.

10. The battery cabinet according to claim 1, characterized in that: The battery is also provided with a coolant injection port and a coolant discharge port, and the piping system also includes a coolant injection main pipe, a plurality of coolant injection branches, a coolant discharge main pipe, and a plurality of coolant discharge branches, one end of the coolant injection branch pipe is connected to the coolant injection main pipe and the other end is connected to the coolant injection port of the battery, one end of the coolant discharge branch pipe is connected to the coolant discharge main pipe and the other end is connected to the coolant discharge port of the battery.

11. The battery cabinet according to claim 7, characterized in that: The multiple batteries are electrically connected through a connecting bus and led out through a busbar. A lead-out terminal is provided on the first cabinet wall or the second cabinet wall. The lead-out terminal can be electrically connected to the busbar and can be used for electrical connection between multiple battery cabinets.

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