Battery explosion-proof structure and battery pack

Abstract

The present application relates to a battery explosion-proof structure and a battery pack. In the battery explosion-proof structure, a cover is provided with a through hole, the cover being configured to cover a battery case, and the through hole being configured to allow communication with the outside of the battery case; and a rupture disc covers the through hole, the rupture disc being configured to open the through hole when thermal runaway occurs in the battery case, so as to achieve pressure relief for the battery case through the through hole. Pressure relief of the battery is realized by means of rupture, eliminating the need for explosion-proof valve components and simplifying the battery explosion-proof structure.

Description

Battery explosion-proof structure and battery pack

[0001] [Correction 06.11.2025 in accordance with Rule 91] This application claims priority to Chinese Patent Application No. 202422898953.6, filed with the Chinese Patent Office on November 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery explosion-proof structure and battery pack. Background Technology

[0003] When a battery experiences thermal runaway, the electrical and chemical energy stored inside is released in a large amount of time, causing the internal temperature to rise rapidly. Simultaneously, the large amount of gas produced by the decomposition of the electrolyte and active materials leads to a sharp increase in internal pressure, potentially causing the battery to explode. To ensure battery safety, an explosion-proof valve is typically installed on the battery casing to release internal pressure promptly when it becomes too high, preventing the battery from exploding during thermal runaway. Technical issues

[0004] Currently, battery packs typically use either pin-type or spring-piston-type explosion-proof valves, but these valves have complex structures and poor pressure relief performance. Technical solutions

[0005] In a first aspect, this application provides a battery explosion-proof structure, comprising:

[0006] The cover has a through hole and is designed to cover the battery box. The through hole is designed to connect to the outside of the battery box.

[0007] A rupture membrane is installed over the through-hole; the rupture membrane is designed to conduct pressure relief to the battery box in the event of thermal runaway within the battery box.

[0008] A flow-draining component is installed in the cover and communicates with the through hole. The flow-draining component is configured to divert the gas generated by thermal runaway to the through hole when thermal runaway occurs inside the battery box.

[0009] Secondly, this application provides a battery pack, including a cell assembly, a battery housing, and a battery explosion-proof structure as described in any of the above.

[0010] The battery cell assembly is housed inside the battery casing, and the battery explosion-proof structure is located on the battery casing. Beneficial effects

[0011] The beneficial effects provided by this application are as follows: The above-mentioned battery explosion-proof structure includes a cover, a rupture membrane, and a drainage component. The cover is provided with a through hole and is configured to cover the battery housing. The through hole is configured to connect to the outside of the battery housing. The rupture membrane is disposed on the through hole. The rupture membrane is configured to conduct through the through hole to relieve pressure on the battery housing when thermal runaway occurs inside the battery housing. The drainage component is disposed on the cover and is connected to the through hole. The drainage component is configured to drain the gas generated by thermal runaway to the through hole when thermal runaway occurs inside the battery housing, thereby achieving rapid pressure relief during battery thermal runaway. This application directly covers the corresponding through holes of the cover with a rupture membrane, eliminating the need for explosion-proof valve parts. When the battery experiences thermal runaway, the rupture membrane is ruptured by the high pressure generated by the thermal runaway, making the through holes conductive. This allows for pressure relief of the battery casing through the through holes, achieving rupture pressure relief of the battery. This simplifies the battery explosion-proof structure, makes the rupture membrane easy to install, and reduces costs. By setting a drainage component connecting the through holes, when the battery experiences thermal runaway, the gas generated by the thermal runaway is guided to the through holes quickly, thereby improving the pressure relief efficiency of the battery thermal runaway and enhancing the pressure relief effect. Attached Figure Description

[0012] Figure 1 is a first-view assembly structure diagram of the battery explosion-proof structure in an embodiment of this application;

[0013] Figure 2 is a schematic diagram of the assembly structure of the battery explosion-proof structure in an embodiment of this application from a second perspective.

[0014] Figure 3 is a schematic diagram of the assembly structure of the battery explosion-proof structure in the embodiment of this application from a third-view perspective.

[0015] Figure 4 is a partial exploded view of the battery explosion-proof structure in an embodiment of this application;

[0016] Figure 5 is a first exploded structural diagram of the battery pack in an embodiment of this application;

[0017] Figure 6 is a second exploded structural diagram of the battery pack in an embodiment of this application;

[0018] Figure 7 is a schematic diagram of the battery pack structure in an embodiment of this application.

[0019] In the picture:

[0020] 10. Cover; 110. Top panel; 120. Extension panel; 130. Through hole; 140. First mounting part;

[0021] 20. Bursting membrane; 210. Second mounting section; 30. Drainage assembly; 320. Collection section; 322. First plate;

[0022] 324. Second plate; 330. Current-draining section; 332. Third plate; 334. Fourth plate; 40. Battery housing;

[0023] 50. Battery cell assembly.

[0024] Implementation methods of this application

[0025] In one embodiment, as shown in Figures 1, 5, and 6, a battery explosion-proof structure is provided, including a cover 10, a rupture membrane 20, and a drainage assembly 30. The cover 10 is provided with a through hole 130 and is configured to cover a battery housing 40. The through hole 130 is configured to connect to the outside of the battery housing 40. The rupture membrane 20 is disposed on the through hole 130. The rupture membrane 20 is configured to conduct through the through hole 130 to relieve pressure on the battery housing 40 in the event of thermal runaway within the battery housing 40. The drainage assembly 30 is disposed on the cover 10 and is connected to the through hole 130. The drainage assembly 30 is configured to drain the gas generated by thermal runaway to the through hole 130 in the event of thermal runaway within the battery housing 40.

[0026] The battery explosion-proof structure can be applied to a battery pack, which may include a battery housing 40. A cell assembly 50 is disposed within the battery housing 40. The cell assembly 50 may consist of a single individual cell, or at least two individual cells. These individual cells can be connected in series and / or parallel. The individual cell can be a lithium-ion cell, and its shape may be, but is not limited to, square or cylindrical. The battery housing 40 may be square in shape and has a receiving cavity and an opening. The receiving cavity and the opening are connected. The cell assembly 50 is disposed within the receiving cavity of the battery housing 40. A cover 10 is placed over the opening of the battery housing 40 to seal the receiving cavity, thereby limiting and fixing the cell assembly 50. For example, the cover 10 may be disposed on the opening of the battery housing 40 by screwing, snap-fitting, and / or adhesive bonding.

[0027] The cover 10 can be made of metal or non-metal. For example, the cover 10 can be made of plastic; or it can be made of aluminum with an insulating layer on its surface. The cover 10 has a through hole 130 that connects to the outside of the battery housing 40. For example, the through hole 130 can be made on the inner wall of the cover 10. The through hole 130 is used to quickly release the gas generated by thermal runaway in the battery housing 40, thereby rapidly depressurizing the battery housing 40 and preventing it from exploding. For example, the shape of the through hole 130 can be, but is not limited to, circular. It should be noted that the size of the through hole 130 can be determined according to the specific model and size of the battery pack.

[0028] The rupture membrane 20 has a thin-film structure and can be a protective membrane with a breathable and waterproof / dustproof (IP67) structure. This allows it to balance the air pressure inside and outside the battery box 40 during normal battery pack operation, preventing abnormal pressure inside the battery box 40. The rupture membrane 20 can cover and seal the through-hole 130, preventing dust or external liquids from entering the battery box 40 through the through-hole 130 when there is no thermal runaway, thus providing waterproof and dustproof protection for the battery pack. The rupture membrane 20 has a burst pressure threshold. When the pressure on the rupture membrane 20 reaches the burst pressure threshold, the rupture membrane 20 will burst, causing the through-hole 130 to open and allowing pressure relief to be provided through the through-hole 130.

[0029] By covering the through hole 130 of the cover 10 with a burst membrane 20, when thermal runaway occurs inside the battery box 40, the high pressure generated by the thermal runaway will break through the burst membrane 20, thereby opening the through hole 130 on the cover 10. The battery box 40 can be depressurized through the through hole 130, realizing rapid depressurization and gas release inside the battery box 40. There is no need to use complex explosion-proof valve parts, thus simplifying the battery explosion-proof structure and reducing structural costs.

[0030] The inner wall of the cover 10 is provided with a drainage component 30. For example, the cover 10 and the drainage component 30 can be an integrally formed structure. The cover 10 and the drainage component 30 together form a drainage channel, which connects to the through hole 130 and the receiving cavity of the battery housing 40. The drainage channel can be used to guide the gas generated by thermal runaway to be rapidly transported to the through hole 130, so that the through hole 130 can quickly discharge the gas generated by thermal runaway to the outside, thereby achieving rapid depressurization of the battery housing 40. In another example, the drainage channel may also consist only of the drainage component 30, which can be installed on the inner wall of the cover 10 by welding or other methods.

[0031] When thermal runaway occurs inside the battery housing 40, the gas generated by the thermal runaway will flow towards the cover 10, causing some of the gas to enter the drainage component 30. The drainage component 30 can then quickly guide some of the gas generated by the thermal runaway to the through hole 130, causing the gas generated by the thermal runaway to gather at the through hole 130. When the gas pressure at the through hole 130 reaches the burst pressure threshold of the rupture membrane 20, the gas generated by the thermal runaway will break through the rupture membrane 20, thereby making the through hole 130 open and enabling the gas generated by the thermal runaway to be quickly discharged to the outside of the battery housing 40 through the through hole 130, thus improving the efficiency of battery pressure relief.

[0032] In the above embodiments, a through hole 130 is provided in the cover 10, which is configured to cover the battery box 40, and the through hole 130 is configured to connect to the outside of the battery box 40; a burst membrane 20 is provided on the through hole 130; the burst membrane 20 is configured to conduct through the through hole 130 when the battery box 40 experiences thermal runaway, so as to depressurize the battery box 40 through the through hole 130; a drainage component 30 is provided in the cover 10, and the drainage component 30 is connected to the through hole 130; the drainage component 30 is configured to drain the gas generated by thermal runaway to the through hole 130 when the battery box 40 experiences thermal runaway, so as to achieve rapid depressurization when the battery experiences thermal runaway. This application directly covers the corresponding through hole 130 of the cover 10 with a burst membrane 20, eliminating the need for explosion-proof valve parts. When the battery experiences thermal runaway, the burst membrane 20 is ruptured by the high pressure generated by the battery's thermal runaway, making the through hole 130 conductive. This allows for pressure relief of the battery housing 40 through the through hole 130, achieving explosion-proof pressure relief of the battery. This simplifies the battery's explosion-proof structure, makes the burst membrane 20 easy to install, and reduces costs. By setting a flow-guiding component 30 connecting the through hole 130, when the battery experiences thermal runaway, the gas generated by the thermal runaway is guided to the through hole 130 quickly, thereby improving the pressure relief efficiency of the battery's thermal runaway and enhancing the pressure relief effect.

[0033] In one embodiment, as shown in FIG4, the cover 10 is provided with a first mounting portion 140 surrounding the through hole 130; the rupture membrane 20 has a second mounting portion 210; the second mounting portion 210 is disposed on the first mounting portion 140 so that the rupture membrane 20 seals the through hole 130.

[0034] The first mounting portion 140 may be in the shape of a hollow ring, and is disposed around the periphery of the through hole 130. For example, the first mounting portion 140 is connected to the edge of the through hole 130; in another example, the first mounting portion 140 is spaced apart from the edge of the through hole 130. The width of the first mounting portion 140 may be specifically determined according to the installation requirements and burst pressure of the rupture membrane 20.

[0035] The second mounting portion 210 may be annular, and is located adjacent to the periphery of the rupture membrane 20. The second mounting portion 210 is used to mount the second mounting portion 140. For example, the shape and size of the second mounting portion 210 may be the same as those of the first mounting portion 140. Adhesive or welded components may be pre-installed in either the first mounting portion 140 or the second mounting portion 210, allowing the second mounting portion 210 to be fixed to the first mounting portion 140 by bonding or welding, thereby achieving the installation and sealing of the rupture membrane 20 in the through hole 130. Alternatively, if the area of ​​the first mounting portion 140 is larger than the area of ​​the second mounting portion 210, adhesive or welded components may be pre-installed in the first mounting portion 140, facilitating the bonding or welding of the second mounting portion 210 to the first mounting portion 140 and improving the ease of installation of the rupture membrane 20.

[0036] For example, by setting the second mounting portion 210 of the rupture membrane 20 on the first mounting portion 140 of the cover 10, when the battery pack is working normally, it can prevent dust or external liquid from entering the battery box 40 through the through hole 130, thus providing waterproof and dustproof protection for the battery pack. When thermal runaway occurs inside the battery box 40, the gas generated by the thermal runaway is quickly guided to the through hole 130 through the drainage component 30. When the gas pressure at the through hole 130 reaches the burst pressure threshold of the rupture membrane 20, the gas generated by the thermal runaway breaks through the rupture membrane 20, causing the second mounting portion 210 of the rupture membrane 20 to detach from the first mounting portion 140 of the cover 10, thereby making the through hole 130 open and realizing the rapid discharge of the gas generated by the thermal runaway to the outside of the battery box 40 through the through hole 130, thus improving the efficiency of battery depressurization.

[0037] In one embodiment, the rupture membrane 20 further has a rupture portion; the rupture portion is located within the second mounting portion 210, and the area of ​​the rupture portion is less than or equal to the area of ​​the second mounting portion 210.

[0038] The bursting pressure that the bursting part can withstand is less than the bursting pressure that the non-bursting part of the bursting membrane 20 can withstand. The bursting part is located in the second mounting part 210. For example, the area of ​​the bursting part is equal to the area of ​​the second mounting part 210, that is, the second mounting part 210 is the bursting part. When thermal runaway occurs in the battery box 40, the gas generated by thermal runaway is quickly guided to the through hole 130 through the drainage component 30. When the gas pressure at the through hole 130 reaches the bursting pressure threshold of the bursting part, it bursts through the connection between the second mounting part 210 and the first mounting part 140, causing the second mounting part 210 of the bursting membrane 20 to separate from the first mounting part 140 of the cover 10, thereby making the through hole 130 open, realizing the rapid discharge of the gas generated by thermal runaway to the outside of the battery box 40 through the through hole 130, improving the efficiency of battery pressure relief.

[0039] In another example, the area of ​​the bursting part is smaller than the area of ​​the second mounting part 210 but larger than half the area of ​​the second mounting part 210. Then, the second mounting part 210 can be divided into a first region corresponding to the bursting part and a second region corresponding to the non-bursting part. The thickness of the adhesive or welded part provided in the first region of the second mounting part 210 is smaller than the thickness of the adhesive or welded part provided in the second region. As a result, the bursting pressure in the first region of the second mounting part 210 is smaller than the bursting pressure in the second region. When the gas pressure at the through hole 130 reaches the bursting pressure threshold of the bursting part, the weld or adhesive mark of the bursting part bursts, causing the second mounting part 210 of the bursting membrane 20 to separate from the first mounting part 140 of the cover 10. This allows the through hole 130 to be opened, enabling the gas generated by thermal runaway to be quickly discharged to the outside of the battery box 40 through the through hole 130, thereby improving the efficiency of battery depressurization.

[0040] In one embodiment, as shown in Figures 2 and 5, the cover 10 is provided with an adjacent top panel 110 and an extension panel; the top panel 110 and the extension panel form a preset angle; a through hole 130 is provided on the extension panel, and a drainage component 30 is provided on the top panel 110.

[0041] The top panel 110 and the extension panel of the cover 10 are integrally formed. The preset included angle between the top panel 110 and the extension panel can be 90°. The top panel 110 has an outer top surface and an inner top surface. The outer top surface of the top panel 110 is provided with positive and negative terminals and a handle. The drainage component 30 is disposed on the inner top surface of the top panel 110. For example, the inner top surface of the top panel 110 is also provided with several protruding ribs to strengthen the cover 10.

[0042] The extended panel is provided with a through hole 130, which is connected to the drainage component 30. By covering the through hole 130 with a rupture membrane 20, when the battery experiences thermal runaway, the thermal runaway gas gathers towards the top panel 110 of the cover 10 and is guided by the drainage component 30 to quickly reach the through hole 130. When the pressure at the through hole 130 reaches the rupture pressure threshold, the rupture membrane 20 is ruptured by the high pressure generated by the battery's thermal runaway, making the through hole 130 open. This allows for pressure relief of the battery housing 40 through the through hole 130, achieving rupture pressure relief of the battery. This eliminates the need for explosion-proof valve parts, simplifies the battery explosion-proof structure, makes the rupture membrane 20 easy to install, and reduces costs.

[0043] In one embodiment, as shown in Figures 1 and 6, the drainage component 30 includes a collection section 320 and a plurality of drainage sections 330; the first end of the collection section 320 is connected to each drainage section 330, and the second end of the collection section 320 is connected to the through hole 130.

[0044] The collecting section 320 and each drainage section 330 are integrally formed. The collecting section 320 and the corresponding drainage section 330 are at a preset angle, for example, the angle between the corresponding drainage section 330 and the collecting section 320 can be 90°.

[0045] The drainage section 330 is used to drain the gas generated by thermal runaway inside the battery box 40 to the collection section 320. The collection section 320 is used to gather the transmitted airflow to the through hole 130 so that the gas generated by thermal runaway can quickly reach the through hole 130. Then, when the pressure at the through hole 130 reaches the burst pressure threshold, it can quickly break through the burst membrane 20 and achieve rapid pressure relief of the battery box 40.

[0046] In one embodiment, as shown in FIG3, the second end dimension of the collection segment 320 is less than or equal to the first end dimension of the collection segment 320.

[0047] For example, the collecting section 320 and the cover 10 enclose a collecting groove. By setting the size of the second end of the collecting section 320 to be smaller than the size of the first end of the collecting section 320, the opening of the collecting groove gradually decreases along the direction from the first end to the second end, so that the collected gas generated by thermal runaway can be transmitted to the through hole 130 through the collecting groove, thereby improving the transmission efficiency and pressure relief effect of the gas generated by thermal runaway.

[0048] In one embodiment, as shown in FIG3, the collecting section 320 is provided with a first plate 322 and a second plate 324; the draining section 330 is provided with a third plate 332 and a fourth plate 334; the first plate 322 and the second plate 324 are spaced apart, and the third plate 332 and the fourth plate 334 are spaced apart.

[0049] The first plate 322 and the second plate are perpendicular to the top panel 110 of the cover 10. For example, the first plate 322 forms an acute angle with the top panel 110 of the cover 10, and the second plate forms an obtuse angle with the top panel 110 of the cover 10, thus forming a funnel-shaped collecting groove between the first plate 322, the second plate 324, and the top panel 110 of the cover 10. Similarly, the third plate 332 and the fourth plate are perpendicular to the top panel 110 of the cover 10. For example, the third plate 332 forms an acute angle with the top panel 110 of the cover 10, and the fourth plate forms an obtuse angle with the top panel 110 of the cover 10, thus forming a funnel-shaped drain channel between the third plate 332, the fourth plate 334, and the top panel 110 of the cover 10.

[0050] The first plate 322, the second plate 324, and the top panel 110 of the cover 10 form a collecting groove, and the third plate 332, the corresponding fourth plate 334, and the top panel 110 of the cover 10 form a corresponding guiding groove. When thermal runaway occurs inside the battery box 40, the gas generated by thermal runaway will move towards the cover 10, causing some of the gas generated by thermal runaway to enter each guiding groove and be transferred to the collecting groove through each guiding groove. Through the collecting groove, some of the gas generated by thermal runaway can be quickly guided to the through hole 130, so that the gas generated by thermal runaway is collected at the through hole 130. When the gas pressure at the through hole 130 reaches the burst pressure threshold of the bursting membrane 20, the gas generated by thermal runaway breaks through the bursting membrane 20, thereby making the through hole 130 open, realizing the rapid discharge of the gas generated by thermal runaway to the outside of the battery box 40 through the through hole 130, improving the efficiency of battery pressure relief.

[0051] In one embodiment, as shown in FIG3, the distance between the first plate 322 and the second plate 324 is less than or equal to the distance between the third plate 332 and the corresponding fourth plate 334.

[0052] For example, the first plate 322 and the second plate 324 are spaced apart, and the third plate 332 and the corresponding fourth plate 334 are spaced apart. The distance between the first plate 322 and the second plate 324 is smaller than the distance between the third plate 332 and the corresponding fourth plate 334. This makes the flow channel space of the collecting groove smaller than the flow channel space of the corresponding diversion sub-groove, so that each diversion sub-groove can divert and transmit the gas generated by thermal runaway to the collecting groove. Through the collection of the collecting groove, part of the gas generated by thermal runaway can be quickly diverted to the through hole 130, so that the gas generated by thermal runaway can quickly reach the through hole 130. When the gas pressure at the through hole 130 reaches the burst pressure threshold of the bursting membrane 20, the gas generated by thermal runaway can quickly break through the bursting membrane 20, improving the efficiency of battery pressure relief.

[0053] In one embodiment, the bursting membrane 20 is attached to the through hole 130 by adhesive or welding.

[0054] For example, the rupture membrane 20 can be applied to the through hole 130 by adhesive bonding. For instance, adhesive can be applied at the mounting point between the rupture membrane 20 and the cover 10. By placing the rupture membrane 20 at the corresponding mounting point and heating the adhesive at the mounting point, the rupture membrane 20 can be fixed at the corresponding position of the cover 10 to seal and cover the through hole 130.

[0055] For example, the rupture membrane 20 can also be welded onto the through hole 130. The rupture membrane 20 is placed on the edge of the through hole 130 of the cover body 10, and ultrasonic welding or heat welding is performed on the corresponding position to fix the rupture membrane 20 to the corresponding position of the cover body 10 to seal and cover the through hole 130.

[0056] In one embodiment, as shown in Figures 5 to 7, a battery pack is also provided, including a cell assembly 50, a battery housing 40, and a battery explosion-proof structure as described above; the cell assembly 50 is disposed inside the battery housing 40, and the battery explosion-proof structure is disposed on the battery housing 40.

[0057] For details regarding the battery cell assembly 50, battery housing 40, and battery explosion-proof structure, please refer to the specific descriptions of the battery cell assembly 50, battery housing 40, and battery explosion-proof structure in the above embodiments, which will not be repeated here.

[0058] By placing the battery cell assembly 50 inside the battery housing 40, the battery explosion-proof structure includes a cover 10, a rupture membrane 20, and a drainage assembly 30. The cover 10 is provided with a through hole 130 and is configured to cover the battery housing 40. The rupture membrane 20 is placed over the through hole 130. The rupture membrane 20 is configured to conduct through the through hole 130 to relieve pressure on the battery housing 40 in the event of thermal runaway. The drainage assembly 30 is placed on the cover 10 and communicates with the through hole 130. The drainage assembly 30 is configured to drain the gas generated by thermal runaway to the through hole 130 in the event of thermal runaway, thereby achieving rapid pressure relief in the event of battery thermal runaway.

[0059] In the above embodiments, by directly covering the corresponding through holes 130 of the cover 10 with the burst membrane 20, the explosion-proof valve parts are eliminated. When the battery pack experiences thermal runaway, the burst membrane 20 is ruptured by the high pressure generated by the thermal runaway of the battery pack, making the through holes 130 conductive. Then, the pressure is released to the battery box 40 through the through holes 130, realizing the burst pressure relief of the battery pack. This simplifies the battery explosion-proof structure, makes the burst membrane 20 easy to install, and reduces costs. By setting the drainage component 30 connecting the through holes 130, when the battery pack experiences thermal runaway, the gas generated by the thermal runaway is guided to the through holes 130 quickly, thereby improving the pressure relief efficiency of the battery pack thermal runaway and enhancing the pressure relief effect.

[0060] It should be noted that the battery pack may also include components such as liquid cooling plates. A specific battery pack may include more components than those described in the above embodiments, or combine certain components, or have different component arrangements.

Claims

1. A battery explosion-proof structure, comprising: A cover body, wherein the cover body is provided with a through hole, the cover body is configured to cover the battery box body, and the through hole is configured to connect to the outside of the battery box body; A rupture membrane is provided over the through hole; the rupture membrane is configured to open the through hole in the event of thermal runaway within the battery housing, so as to relieve pressure on the battery housing through the through hole. A flow-draining component is disposed on the cover and communicates with the through hole; the flow-draining component is configured to divert the gas generated by thermal runaway to the through hole when thermal runaway occurs inside the battery box.

2. The battery explosion-proof structure according to claim 1, wherein, The cover is provided with a first mounting portion surrounding the through hole; the rupture membrane has a second mounting portion. The second mounting portion is disposed in the first mounting portion so that the bursting membrane seals the through hole.

3. The battery explosion-proof structure according to claim 2, wherein, The rupture membrane also has a rupture section; The blasting part is located inside the second mounting part, and the area of ​​the blasting part is less than or equal to the area of ​​the second mounting part.

4. The battery explosion-proof structure according to claim 1, wherein, The cover is provided with an adjacent top panel and an extension panel; the top panel and the extension panel form a preset angle; The through-hole is disposed on the extension panel, and the drainage component is disposed on the top panel.

5. The battery explosion-proof structure according to claim 1, wherein, The drainage component includes a collection section and several drainage sections; the first end of the collection section is connected to each of the drainage sections, and the second end of the collection section is connected to the through hole.

6. The battery explosion-proof structure according to claim 5, wherein, The second end dimension of the converging segment is less than or equal to the first end dimension of the converging segment.

7. The battery explosion-proof structure according to claim 5, wherein, The collecting section is provided with a first plate and a second plate; the diversion section is provided with a third plate and a fourth plate; The first plate and the second plate are spaced apart, and the third plate and the corresponding fourth plate are spaced apart.

8. The battery explosion-proof structure according to claim 7, wherein, The distance between the first plate and the second plate is less than or equal to the distance between the third plate and the corresponding fourth plate.

9. The battery explosion-proof structure according to any one of claims 1 to 8, wherein, The bursting membrane is attached to the through hole by bonding or welding.

10. A battery pack, comprising a cell assembly, a battery housing, and a battery explosion-proof structure as described in any one of claims 1 to 9; The battery cell assembly is housed within the battery casing, and the battery explosion-proof structure is mounted on the battery casing.

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