Immersed battery explosion-proof system

Abstract

The immersed battery explosion-proof system comprises a battery protection box, a battery module is arranged in the battery protection box in a sealed mode, and a liquid cooling explosion-proof unit is arranged at the upper end of the battery protection box. A liquid cooling explosion-proof unit is arranged at the upper end of the battery protection box, in a working state, the liquid cooling explosion-proof unit utilizes cooling water to dissipate heat of the battery module through a heat conduction effect, and when the battery module breaks down and smokes, the liquid cooling explosion-proof unit directly injects the cooling water into the battery protection box; the battery module is immersed in the cooling water to prevent spontaneous combustion of the battery module.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage battery safety, and in particular to an immersion battery explosion-proof system. Background Art

[0002] Energy storage lithium battery refers to the necessary energy storage component used in various power storage.

[0003] Since the energy storage lithium batteries on the market (which include a battery protection box and a battery module, and the battery module is sealed in the battery protection box) have problems such as battery spontaneous combustion caused by excessive temperature and aging during use, there are serious safety hazards in the field of battery applications.

[0004] The existing method is to only set a liquid cooling circulation device on the outside of the battery protection box to cool the internal battery module. Once the internal battery module starts to smoke (the lithium battery generally produces a large amount of thick smoke and heat before spontaneous combustion), there is no effective means to prevent the subsequent spontaneous combustion of the internal battery module. Therefore, this application provides an immersion battery explosion-proof system to meet the needs. Summary of the invention

[0005] The purpose of the present application is to provide an immersion battery explosion-proof system to solve the technical problem in the prior art that it is impossible to prevent the spontaneous combustion of battery modules inside a battery protection box.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an immersed battery explosion-proof system, comprising a battery protection box with a battery module sealed inside, a liquid-cooled explosion-proof unit being arranged at the upper end of the battery protection box, and when in working state, the liquid-cooled explosion-proof unit utilizes cooling water to dissipate heat from the battery module through heat conduction, and when the battery module fails and smokes, the liquid-cooled explosion-proof unit directly injects cooling water into the battery protection box, so that the battery module is immersed in the cooling water to prevent spontaneous combustion of the battery module.

[0007] As a preferred implementation in this embodiment, the liquid-cooled explosion-proof unit includes a liquid-cooled explosion-proof box that is fitted with the upper end of the battery protection box, and a liquid inlet pipe and a liquid outlet pipe are arranged on the liquid-cooled explosion-proof box, and the liquid inlet pipe and the liquid outlet pipe are respectively connected to the liquid outlet end and the liquid inlet end of the chiller, and the inner cavity of the liquid-cooled explosion-proof box is connected to the inner cavity of the battery protection box through a plurality of U-shaped tubes arranged on both sides, and each of the U-shaped tubes is provided with a first valve, and a first gear is installed on the rotating adjustment shaft of each of the first valves; A mounting rod is fixed to the upper end of the liquid-cooled explosion-proof box, and a movable groove is rotatably provided on the mounting rod, and a movable block is slidably provided in the groove of the movable groove, and universal balls are provided on both side ends and the bottom of the movable block, and a limiting groove adapted to the universal ball is provided in the inner cavity of the groove, and movable openings are penetrated on both sides of the movable groove, and two movable openings are suspended and penetrated by a U-shaped rod, and first gear rods are provided on both lower ends of the U-shaped rod, and the two first gear rods are respectively engaged with the first gears on the same side, and the two first gear rods both slide and penetrate the limiting blocks fixedly provided on the liquid-cooled explosion-proof box; A support rod and a support column are respectively arranged on both sides of the mounting rod, the lower end of the first support rod is slidably arranged in the inner cavity of the air duct through an elastic sealing sleeve, and the lower end of the air duct is communicated with the inner cavity of the battery protection box; At the beginning, the movable groove is set to be lower on the left and higher on the right, the upper end of the support rod contacts the lower end of the movable groove, and the U-shaped tube flow channel is blocked.

[0008] As a preferred implementation manner in this embodiment, it also includes an acceleration unit for accelerating the movement speed of the movable block, so that the movable block quickly drives the first valve to move through the first gear rod, thereby opening the flow channel of the U-shaped tube in advance.

[0009] As a preferred implementation manner in this embodiment, the acceleration unit includes a first magnet and a second magnet, the first magnet is installed in a mounting groove at the front end of the movable block, and the second magnet is installed on the inner cavity wall of the movable groove, the first magnet and the second magnet are arranged opposite to each other, and the relative end magnetic poles are opposite.

[0010] As a preferred implementation manner in this embodiment, it also includes a third magnet and a fourth magnet, the third magnet is arranged in the groove at the upper end of the support column, the fourth magnet is arranged above the third magnet, the fourth magnet is installed at the bottom of the movable groove, and the third magnet and the fourth magnet have opposite magnetic poles at opposite ends.

[0011] As a preferred implementation in this embodiment, it also includes a backflow prevention unit and a self-shutoff unit; Backflow prevention unit: after the flow channel of the U-shaped tube is opened, the liquid outlet pipe is blocked to prevent part of the cooling water from flowing back into the chiller through the liquid outlet pipe; Self-shutoff unit: After the battery module is completely submerged in cold zone water, the injection of cooling water into the battery protection box is automatically stopped.

[0012] As a preferred implementation manner in this embodiment, the backflow prevention unit includes a second valve installed on the liquid outlet pipe, a second gear is installed on the rotary adjustment shaft on the second valve, and the second gear is gear-connected with a second gear rod, and the second gear rod is installed on the first gear rod; The self-shutoff unit includes a mechanical float valve located in the inner cavity of the shell, the liquid outlet end of the mechanical float valve is connected to the liquid-cooled explosion-proof box, the liquid inlet end of the mechanical float valve is connected to the liquid outlet end of the liquid inlet pipe, and the battery protection box is connected to the inner cavity of the shell through an overflow pipe.

[0013] As a preferred implementation manner in this embodiment, it also includes a gas discharge unit for discharging the gas in the battery protection box, thereby reducing the internal air pressure of the battery protection box, which is conducive to accelerating the speed of injecting cooling water into the battery protection box.

[0014] As a preferred implementation manner in this embodiment, the air leakage unit includes an exhaust pipe communicated with the inner cavity of the shell, a third valve is installed on the exhaust pipe, and a third gear is installed on the rotating adjustment shaft of the third valve, and the third gear is gear-connected with the second gear rod.

[0015] In summary, the technical effects and advantages of the present invention are as follows: The present invention has a reasonable structure. A liquid-cooled explosion-proof unit is arranged at the upper end of the battery protection box. In the working state, the liquid-cooled explosion-proof unit uses cooling water to dissipate heat from the battery module through heat conduction. When the battery module fails and smokes, the liquid-cooled explosion-proof unit directly injects cooling water into the battery protection box, so that the battery module is immersed in the cooling water to prevent the battery module from spontaneous combustion. In the present invention, an acceleration unit is provided to shorten the required reaction time, which is conducive to timely immersing the failed battery module in cooling water; In the present invention, a backflow prevention unit and a self-shutoff unit are provided to avoid prolonging the immersion time of the battery module and to avoid wasting cooling water; In the present invention, a gas release unit is provided to discharge the gas in the battery protection box, thereby reducing the internal gas pressure of the battery protection box, which is beneficial to speed up the speed of injecting cooling water into the battery protection box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application 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 some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the liquid-cooled explosion-proof unit; Figure 3 for Figure 2 Explosion diagram of the liquid-cooled explosion-proof unit; Figure 4 for Figure 3 Schematic diagram of the structure of the middle movable tank when viewed from above; Figure 5 for Figure 3 The schematic diagram of the structure of the middle movable slot from the side; Figure 6 for Figure 1 Schematic diagram of the middle shell structure; Figure 7 for Figure 6 Schematic diagram of the partial cross-section structure of the middle shell; Figure 8 It is a side view structural schematic diagram of the present invention.

[0018] In the figure: 1. battery protection box; 2. liquid cooling explosion-proof box; 3. liquid outlet pipe; 4. liquid inlet pipe; 5. U-shaped pipe; 6. first valve; 7. second gear rod; 8. overflow pipe; 9. first gear rod; 10. limit block; 11. air guide pipe; 12. support rod; 13. support column; 14. movable groove; 15. movable opening; 16. U-shaped rod; 17. first gear; 18. mechanical float valve; 19. movable block; 20. limit groove; 21. third magnet; 22. fourth magnet; 23. first magnet; 24. second magnet; 25. second valve; 26. second gear; 27. shell; 28. exhaust pipe; 29. ​​third valve; 30. third gear. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example: Reference Figure 1 An immersed battery explosion-proof system is shown, comprising a battery protection box 1 in which a battery module is sealed and arranged internally, and a liquid-cooled explosion-proof unit is arranged at the upper end of the battery protection box 1. When in working state, the liquid-cooled explosion-proof unit uses cooling water to dissipate heat from the battery module through heat conduction. When the battery module fails and smokes, the liquid-cooled explosion-proof unit directly injects cooling water into the battery protection box 1, so that the battery module is immersed in the cooling water to prevent spontaneous combustion of the battery module.

[0021] As a preferred implementation in this embodiment, Figure 1-3 As shown, the liquid-cooled explosion-proof unit includes a liquid-cooled explosion-proof box 2 that is fitted with the upper end of the battery protection box 1, and a liquid inlet pipe 4 and a liquid outlet pipe 3 are arranged on the upper end of the liquid-cooled explosion-proof box 2, and the liquid inlet pipe 4 and the liquid outlet pipe 3 are respectively connected to the liquid outlet end and the liquid inlet end of the chiller, and the inner cavity of the liquid-cooled explosion-proof box 2 is connected to the inner cavity of the battery protection box 1 through a plurality of U-shaped tubes 5 arranged on both sides, and each U-shaped tube 5 is provided with a first valve 6, and a first gear 17 is installed on the rotating adjustment shaft of each first valve 6; A mounting rod is fixed to the upper end of the liquid-cooled explosion-proof box 2, and a movable groove 14 is rotatably provided on the mounting rod, and a movable block 19 is slidably provided in the groove of the movable groove 14, and universal balls are provided on both side ends and the bottom of the movable block 19, and a limiting groove 20 adapted to the universal ball is provided in the inner cavity of the groove, and movable openings 15 are penetrated on both sides of the movable groove 14, and the two movable openings 15 are suspended and penetrated by the U-shaped rod 16, and the first gear rods 9 are provided on the two lower ends of the U-shaped rod 16, and the two first gear rods 9 are respectively gear-engaged with the first gear 17 on the same side, and the two first gear rods 9 slide through the limiting blocks 10 fixedly provided on the liquid-cooled explosion-proof box 2; A support rod 12 and a support column 13 are respectively arranged on both sides of the mounting rod. The lower end of the first support rod 12 is slidably arranged in the inner cavity of the air guide tube 11 through an elastic sealing sleeve. The lower end of the air guide tube 11 is communicated with the inner cavity of the battery protection box 1. At the beginning, the movable groove 14 is set to be lower on the left and higher on the right, the upper end of the support rod 12 contacts the lower end of the movable groove 14, and the flow channel of the U-shaped tube 5 is blocked.

[0022] When in use, the condensed water in the chiller can be transported to the liquid-cooled explosion-proof box 2 through the pump body through the liquid inlet pipe 4, and the battery module in the battery protection box 1 can be cooled and dissipated through the effect of heat conduction. When the battery module fails and produces smoke, the air pressure in the battery protection box 1 will increase. The increase in air pressure will cause the support rod 12 to move upward under the push of the air pressure, and then the movable groove 14 will gradually form a horizontal state from a state of low left and high right, and then form a state of high left and low right (in this process, the movable groove 14 does not have any contact with the U-shaped rod 16). At this time, the movable block 19 moves obliquely downward and moves under the force of gravity. The U-shaped rod 16 is accelerated under the action of the component force, so that the movable block 19 obtains enough kinetic energy to collide with the U-shaped rod 16 and drives the first gear rods 9 on both sides to move, so that the first gear rods 9 on both sides respectively drive the first gears 17 on both sides to rotate quickly, and finally the flow channel of the U-shaped tube 5 is quickly opened. At this time, the cooling water flowing into the liquid-cooled explosion-proof box 2 can quickly flow to the inner cavity of the battery protection box 1 through multiple U-shaped tubes 5 (the cooling water subsequently input from the liquid inlet pipe 4 can also be discharged into the battery protection box 1 through the U-shaped tube 5), which can quickly immerse the battery module in the condensed water, thereby achieving the purpose of preventing the spontaneous combustion of the battery module.

[0023] It should be noted that: first, the setting of the limiting groove 20 can make the movable block 19 move stably in the inner cavity of the movable groove 14, so that the movable block 14 will not be separated from the movable groove 14 due to collision; second, the purpose of setting multiple U-shaped tubes 5 is to speed up the discharge of cooling water into the battery protection box 1, and the sum of the water discharge volume per unit time of the multiple U-shaped tubes 5 is greater than the liquid intake volume per unit time of the liquid inlet pipe 4, and the liquid inlet end of the U-shaped tube 5 is located below the liquid outlet pipe 3, which can reduce the cooling water from flowing back to the water cooling unit through the liquid outlet pipe 5 (this is in the process of discharging liquid into the battery protection box 1); third, the angle between the movable groove 14 and the horizontal plane is set to 20° to 30° at the beginning, which can effectively prevent It can prevent false triggering (there is gas in the battery protection box 1, and the gas will expand when heated, which will cause the support rod 12 to move up or down within a certain range. If the angle is too small, it will easily cause false triggering) and improve the reaction sensitivity (if the angle is set too large, it will easily take a long time for the movable block 19 in the movable groove 14 to move, which is not conducive to the subsequent rapid immersion of the battery module); Fourth, use condensed water to immerse the battery module. The condensed water has a certain condensation effect, which can further improve the flame retardant effect of the battery module.

[0024] As a preferred implementation in this embodiment, an acceleration unit is also included for accelerating the movement speed of the movable block 19, so that the movable block 19 quickly drives the first valve 6 to move through the first gear rod 9, thereby opening the flow channel of the U-shaped tube 5 in advance.

[0025] The purpose of the acceleration unit is to shorten the required reaction time, which is conducive to timely immersion of the failed battery module in cooling water.

[0026] As a preferred implementation in this embodiment, Figure 3 and Figure 5 As shown, the acceleration unit includes a first magnet 23 and a second magnet 24. The first magnet 23 is installed in the installation groove at the front end of the movable block 19, and the second magnet 24 is installed on the inner cavity wall of the movable groove 14. The first magnet 23 and the second magnet 24 are arranged opposite to each other, and the magnetic poles at the opposite ends are opposite.

[0027] When the movable groove 14 is in a state of being higher on the left and lower on the right, the movable block 19 inside it moves downward along the inclined plane. When it approaches the U-shaped rod 16, the magnetic force of the first magnet 23 and the second magnet 24 will accelerate the movement speed of the movable block 19, thereby accelerating the speed at which the flow channel of the U-shaped tube 5 is opened.

[0028] As a preferred implementation in this embodiment, Figure 3 and Figure 4 As shown, it also includes a third magnet 21 and a fourth magnet 22. The third magnet 21 is arranged in the groove at the upper end of the support column 13, and the fourth magnet 22 is arranged above the third magnet 21. The fourth magnet 22 is installed at the bottom of the movable groove 14, and the magnetic poles of the opposite ends of the third magnet 21 and the fourth magnet 22 are opposite.

[0029] The third magnet 21 and the fourth magnet 22 are provided to further open the flow channel of the U-shaped tube 5 in advance. When the movable groove 14 forms a horizontal state under the action of the support rod 12, the magnetic force of the third magnet 21 and the fourth magnet 22 will cause the right end of the movable groove 14 to rotate downward rapidly, and the lower end of the movable groove 14 will contact the upper end of the support column 13, and the movable groove 14 will stop moving. That is, the action of the third magnet 21 and the fourth magnet 22 can accelerate the movable block 19 to form a left-high-right-low state, which is beneficial to further open the flow channel of the U-shaped tube 5 in advance.

[0030] As a preferred implementation in this embodiment, it also includes a backflow prevention unit and a self-shutoff unit; Backflow prevention unit: after the flow channel of the U-shaped tube 5 is opened, the liquid outlet pipe 3 is blocked to prevent part of the cooling water from flowing back into the chiller through the liquid outlet pipe 3; Self-shutoff unit: After the battery module is completely submerged in the cold zone water, the injection of cooling water into the battery protection box 1 is automatically stopped.

[0031] The backflow prevention unit is provided to prevent part of the cooling water from flowing back into the chiller from the outlet pipe when the cooling water is discharged into the battery protection box 1, so as to avoid prolonging the immersion time of the battery module; The automatic shut-off function is designed to avoid wasting cooling water.

[0032] As a preferred implementation in this embodiment, Figure 1 , Figure 6 and Figure 7 As shown, the backflow prevention unit includes a second valve 25 installed on the liquid outlet pipe 3, a second gear 26 is installed on the rotary adjustment shaft on the second valve 25, and the second gear 26 is gear-engaged with the second gear rod 7, and the second gear rod 7 is installed on the first gear rod 9; The self-shut-off unit includes a mechanical float valve 18 located in the inner cavity of the shell 27, the liquid outlet end of the mechanical float valve 18 is connected to the liquid-cooled explosion-proof box 2, the liquid inlet end of the mechanical float valve 18 is connected to the liquid outlet end of the liquid inlet pipe 4, and the battery protection box 1 is connected to the inner cavity of the shell 27 through the overflow pipe 8.

[0033] While the first gear rod 9 drives the first gear 17 to rotate to open the flow channel of the U-shaped tube 5, the second gear rod 7 drives the second gear 26 to rotate, and finally closes the liquid outlet pipe 4, so that the cooling water cannot be discharged from the liquid outlet pipe 3. All the cooling water flows into the inner cavity of the battery protection box 1 through the flow channel of the U-shaped tube 5, thereby accelerating the immersion of the electromagnetic module; When the battery module is submerged, the cooling water in its battery protection box 1 will overflow into the inner cavity of the shell 27 through the overflow pipe 8. At this time, the float of the mechanical float valve 18 contacts the cooling water and moves downward, eventually blocking the flow channel of the liquid inlet pipe 5 and automatically completing the water cut-off operation, which can effectively avoid the waste of cooling water.

[0034] It should be noted that the chiller is generally connected to multiple liquid-cooled explosion-proof boxes 2. If the flow is not cut off in time after the immersion is completed, the processing will cause the amount of water in the chiller to decrease, which will reduce the amount of cooling water entering other liquid-cooled explosion-proof boxes 2, affecting the cooling treatment of other battery modules.

[0035] As a preferred implementation manner in this embodiment, it also includes a gas discharge unit for discharging the gas in the battery protection box 1, thereby reducing the internal air pressure of the battery protection box 1, which is conducive to accelerating the speed of injecting cooling water into the battery protection box 1.

[0036] As a preferred implementation in this embodiment, Figure 6 As shown, the deflation unit includes an exhaust pipe 28 communicating with the inner cavity of the housing 27 , a third valve 29 is installed on the exhaust pipe 28 , and a third gear 30 is installed on the rotation adjustment shaft of the third valve 29 , and the third gear 30 is gear-connected with the second gear rod 7 .

[0037] The movement of the first gear rod 9 can drive the second gear rod 7 to move, and the movement of the second gear rod 7 drives the third gear 30 to move, thereby opening the third valve 29, so that the air pressure inside the battery protection box 1 is balanced with the external atmospheric pressure, and the cooling water in the liquid-cooled explosion-proof box 2 can quickly flow into the battery protection box 1.

[0038] It should be noted that driving teeth are arranged in rows on both side ends of the second gear rod 7 .

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An immersion battery explosion-proof system, comprising a battery protection box (1) in which a battery module is sealed and arranged, characterized in that: A liquid-cooled explosion-proof unit is provided at the upper end of the battery protection box (1). When in operation, the liquid-cooled explosion-proof unit uses cooling water to dissipate heat from the battery module through heat conduction. When the battery module fails and smokes, the liquid-cooled explosion-proof unit directly injects cooling water into the battery protection box (1), so that the battery module is immersed in the cooling water to prevent spontaneous combustion of the battery module.

2. The submerged battery explosion-proof system according to claim 1, characterized in that: The liquid-cooled explosion-proof unit comprises a liquid-cooled explosion-proof box (2) which is arranged in close contact with the upper end of the battery protection box (1); a liquid inlet pipe (4) and a liquid outlet pipe (3) are arranged on the upper end of the liquid-cooled explosion-proof box (2); the liquid inlet pipe (4) and the liquid outlet pipe (3) are respectively connected to the liquid outlet end and the liquid inlet end of the chiller; the inner cavity of the liquid-cooled explosion-proof box (2) is connected to the inner cavity of the battery protection box (1) via a plurality of U-shaped tubes (5) arranged on both sides; each of the U-shaped tubes (5) is provided with a first valve (6); and a first gear (17) is installed on the rotation adjustment shaft of each of the first valves (6); A mounting rod is fixed to the upper end of the liquid-cooled explosion-proof box (2), and a movable groove (14) is rotatably provided on the mounting rod, and a movable block (19) is slidably provided in the groove of the movable groove (14), and both side ends and the bottom of the movable block (19) are provided with universal balls, and the inner cavity of the groove is provided with a limiting groove (20) adapted to the universal ball, and movable openings (15) are penetrated on both sides of the movable groove (14), and two movable openings (15) are suspended and penetrated by a U-shaped rod (16), and first gear rods (9) are provided on both lower ends of the U-shaped rod (16), and the two first gear rods (9) are respectively gear-connected with the first gear (17) on the same side, and the two first gear rods (9) both slide and penetrate the limiting blocks (10) fixedly provided on the liquid-cooled explosion-proof box (2); A support rod (12) and a support column (13) are respectively arranged on both sides of the mounting rod, the lower end of the first support rod (12) is slidably arranged in the inner cavity of the air guide tube (11) through an elastic sealing sleeve, and the lower end of the air guide tube (11) is in communication with the inner cavity of the battery protection box (1); At the beginning, the movable groove (14) is arranged to be lower on the left and higher on the right, the upper end of the support rod (12) contacts the lower end of the movable groove (14), and the flow channel of the U-shaped tube (5) is blocked.

3. The submerged battery explosion-proof system according to claim 2, characterized in that: It also includes an acceleration unit for accelerating the movement speed of the movable block (19), so that the movable block (19) quickly drives the first valve (6) to move via the first gear rod (9), thereby causing the flow channel of the U-shaped tube (5) to be opened in advance.

4. The submerged battery explosion-proof system according to claim 3, characterized in that: The acceleration unit comprises a first magnet (23) and a second magnet (24), wherein the first magnet (23) is mounted in a mounting groove at the front end of the movable block (19), and the second magnet (24) is mounted on the inner cavity wall of the movable groove (14), and the first magnet (23) and the second magnet (24) are arranged opposite to each other, and the magnetic poles of the opposite ends are opposite.

5. The submerged battery explosion-proof system according to claim 4, characterized in that: It also includes a third magnet (21) and a fourth magnet (22), wherein the third magnet (21) is arranged in a groove at the upper end of the support column (13), the fourth magnet (22) is arranged above the third magnet (21), and the fourth magnet (22) is installed at the bottom of the movable groove (14), and the magnetic poles of the third magnet (21) and the fourth magnet (22) at opposite ends are opposite.

6. The submerged battery explosion-proof system according to claim 2, characterized in that: It also includes a backflow prevention unit and a self-shutoff unit; Backflow prevention unit: after the flow channel of the U-shaped tube (5) is opened, the liquid outlet pipe (3) is blocked to prevent part of the cooling water from flowing back into the chiller through the liquid outlet pipe (3); A self-shut-off unit automatically stops injecting cooling water into the battery protection box (1) after the battery module is completely submerged in cold zone water.

7. The submerged battery explosion-proof system according to claim 6, characterized in that: The backflow prevention unit comprises a second valve (25) mounted on the liquid outlet pipe (3); a second gear (26) is mounted on a rotation adjustment shaft on the second valve (25); the second gear (26) is gear-engaged with a second gear rod (7); and the second gear rod (7) is mounted on the first gear rod (9); The self-shutoff unit comprises a mechanical float valve (18) located in the inner cavity of a housing (27); a liquid outlet end of the mechanical float valve (18) is connected to the liquid-cooled explosion-proof box (2); a liquid inlet end of the mechanical float valve (18) is connected to the liquid outlet end of the liquid inlet pipe (4); and the battery protection box (1) is in communication with the inner cavity of the housing (27) via an overflow pipe (8).

8. The submerged battery explosion-proof system according to claim 7, characterized in that: It also comprises a gas discharge unit for discharging the gas in the battery protection box (1), thereby reducing the internal gas pressure of the battery protection box (1), which is conducive to accelerating the speed of injecting cooling water into the battery protection box (1).

9. The submerged battery explosion-proof system according to claim 8, characterized in that: The air release unit comprises an exhaust pipe (28) communicating with the inner cavity of the housing (27); a third valve (29) is mounted on the exhaust pipe (28); a third gear (30) is mounted on the rotation adjustment shaft of the third valve (29); and the third gear (30) is gear-connected with the second gear rod (7).

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