Explosion-proof valve, box body assembly of battery pack, battery pack and electric equipment

Abstract

The invention provides an anti-explosion valve, a box assembly of a battery pack, the battery pack and electric equipment, and relates to the technical field of batteries. The anti-explosion valve comprises a valve shell and a water blocking valve, the valve shell is used for being fixedly connected with a box body, and an airflow channel is defined by the valve shell and used for balancing air pressure inside and outside the box body; the water blocking valve is arranged in the airflow channel, and the water blocking valve is configured to block the airflow channel when air pressure inside and outside the box body is balanced and conduct the airflow channel when pressure difference exists between the air pressure inside and outside the box body. The explosion-proof valve provided by the invention can exchange gas with the outside only when the air pressure of the box body of the battery pack is inconsistent, so that the content of water vapor entering the battery cavity is reduced, and the safety of the operation of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to an explosion-proof valve, a box body assembly of a battery pack, a battery pack, and an electrical device. Background Art

[0002] In order to avoid dangers caused by problems such as thermal runaway inside the battery pack, an explosion-proof valve is provided on the battery pack. When high-temperature and high-pressure gas is generated inside the battery pack, the explosion-proof valve can quickly discharge the gas to prevent explosion.

[0003] In the prior art, a waterproof and breathable membrane is provided on the explosion-proof valve to prevent liquid water from entering the inside of the battery pack. At the same time, the waterproof and breathable membrane also has good air permeability and can balance the pressure inside and outside the battery pack.

[0004] However, the waterproof and breathable membrane cannot prevent water vapor from entering the inside of the battery pack. The condensation formed after the water vapor enters the battery pack will cause the insulation resistance to decrease, posing a safety hazard. Summary of the Invention

[0005] The embodiments of this application provide an explosion-proof valve, a box body assembly of a battery pack, a battery pack, and an electrical device, which are beneficial to preventing water vapor from entering the inside of the battery pack and improving the safety of the battery pack.

[0006] In a first aspect, this application provides an explosion-proof valve, including: a valve housing for fixedly connecting with a box body, the valve housing defining an air flow channel for balancing the air pressure inside and outside the box body; a water-blocking valve flap disposed in the air flow channel, the water-blocking valve flap being configured to block the air flow channel when the air pressure inside and outside the box body is balanced, and to conduct the air flow channel when there is a pressure difference between the inside and outside of the box body.

[0007] In a possible implementation manner, the water-blocking valve flap is an elastic member, and the water-blocking valve flap is configured to be deformed under the action of air pressure so as to conduct or block the air flow channel.

[0008] In a possible implementation manner, it further includes: a mounting bracket disposed in the air flow channel and fixedly connected with the valve housing, and the water-blocking valve flap is connected to the mounting bracket.

[0009] In a possible implementation, the mounting bracket includes a support plate. The support plate is provided with a deformation guiding hole and a first air flow hole, and the first air flow hole is arranged on the periphery of the deformation guiding hole; the water blocking valve flap is adhesively arranged on the side of the support plate facing away from the battery cavity. The water blocking valve flap includes a first deformation area and a second deformation area. The first deformation area is opposite to the first air flow hole, and the second deformation area is opposite to the deformation guiding hole and is provided with an openable and closable air permeable hole; the water blocking valve flap is configured such that when the external air pressure is greater than the air pressure in the battery cavity, the first deformation area covers the first air flow hole, and the second deformation area deforms to open the air permeable hole. When the external air pressure is less than the air pressure in the battery cavity, the first deformation area deforms to open the first air flow hole, and the air permeable hole closes.

[0010] In a possible implementation, along the radial direction of the air flow channel and from the outside to the inside, the support plate extends obliquely towards the side close to the battery cavity, and the deformation guiding hole is located at the bottom end of the support plate.

[0011] In a possible implementation, the support plate is further provided with a first through hole on the periphery of the deformation guiding hole, and the water blocking valve flap is provided with a second through hole opposite to the first through hole; the explosion-proof valve further includes: a pressing block, including a block body and a fixing column. The block body is arranged on the side of the water blocking valve flap facing away from the support plate, the fixing column is connected to the block body and passes through the first through hole and the second through hole. The block body is in pressing contact with the water blocking valve flap, and the block body is provided with a second air flow hole, and the second air flow hole communicates with the deformation guiding hole.

[0012] In a possible implementation, at least part of the structure of the second deformation area forms a deformation convex part, the deformation convex part is opposite to the deformation guiding hole, and the air permeable hole is formed in the deformation convex part; the side of the block body facing the water blocking valve flap is provided with a pressing convex part adapted to extend into the deformation guiding hole, and the pressing convex part is used to press the deformation convex part into the deformation guiding hole.

[0013] In a possible implementation, the side of the block body facing away from the water blocking valve flap is provided with a mounting groove, the second air flow hole penetrates the bottom wall of the mounting groove, and the explosion-proof valve further includes: a molecular sieve plug, the molecular sieve plug is fixed in the mounting groove and covers the second air flow hole, and the molecular sieve plug is used to absorb external water vapor.

[0014] In a possible implementation, the mounting bracket includes: side plates, which surround the periphery of the support plate and are connected to the valve housing.

[0015] In a possible implementation, an annular groove surrounding the air flow channel is provided in the channel wall of the air flow channel, and the side plates are fixed in the annular groove.

[0016] In a possible implementation, the water-blocking valve includes a plurality of sub-regions distributed radially along the valve housing. Each sub-region includes an inner edge and an outer edge that are opposite to each other in the radial direction. Among two adjacent sub-regions, the outer edge of the sub-region closer to the inside protrudes beyond the inner edge of the sub-region closer to the outside.

[0017] In a possible implementation, a plurality of water-absorbing structures are provided on the surface of the water-blocking valve facing away from the battery chamber.

[0018] In a possible implementation, the plurality of water-absorbing structures are divided into multiple groups distributed radially along the water-blocking valve. Each group includes a plurality of water-absorbing structures distributed circumferentially along the water-blocking valve.

[0019] In a possible implementation, the water-blocking valve includes a silicone member.

[0020] In a possible implementation, the valve housing includes: a valve body, the inner wall of the valve body defines an air flow channel, and the valve body is provided with a clamping structure; an upper cover, covering the outside of the valve body, the upper cover is provided with a clamping cooperation structure, and the upper cover and the valve body are clamped and cooperated through the clamping structure and the clamping cooperation structure.

[0021] In a possible implementation, the clamping structure is formed as a clamping protrusion, and the clamping cooperation structure is formed as a clamping groove, and the clamping protrusion is clamped in the clamping groove.

[0022] In a possible implementation, the clamping structure is formed on the outer peripheral wall of the valve body; the upper cover includes a side wall and a top wall, the clamping cooperation structure is formed on the side wall, the side wall is spaced from the outer peripheral wall, and the top wall is spaced from the top end face of the valve body, so as to form a ventilation gap between the upper cover and the valve body, and the air flow channel communicates with the outside through the ventilation gap.

[0023] In a possible implementation, it further includes: a waterproof and breathable membrane, disposed in the air flow channel and located on the side of the water-blocking valve away from the box body.

[0024] In a possible implementation, a groove is provided on the top end face of the valve body, and the waterproof and breathable membrane is fixedly disposed in the groove.

[0025] In a possible implementation, the valve body is further provided with a fixed buckle for connecting with the box body of the battery pack.

[0026] In a second aspect, the present application provides a box body assembly of a battery pack, including: a box body, defining a battery chamber; any one of the explosion-proof valves in the first aspect, the valve housing of the explosion-proof valve is fixedly connected to the box body, and the air flow channel of the explosion-proof valve is used to communicate the battery chamber and the outside.

[0027] In a third aspect, the present application provides a battery pack, including: the box body assembly in the second aspect; a battery module, disposed in the battery chamber.

[0028] Fourth aspect, the present application provides an electrical device, including: an electrical device; the battery pack of the third aspect, and the battery pack is used to supply power to the electrical device.

[0029] For the explosion-proof valve provided by the present application, by defining an air flow channel on the valve housing, the air flow channel is communicated with the inside of the box body to balance the air pressure inside and outside the box body. By providing a water-blocking valve flap on the air flow channel to block the water vapor outside the box body from entering the box body. When the air pressure inside and outside the box body is balanced, the air flow channel is blocked by the water-blocking valve flap, so that the exchange of gases between the outside and the inside of the box body can be prevented, which is beneficial to preventing the outside water vapor from entering the box body. When there is a pressure difference between the air pressure inside and outside the box body, the water-blocking valve flap deforms to make the air flow channel conductive. At this time, the gas inside the box body exchanges with the outside gas until the air pressure inside and outside the box body is balanced, and the water-blocking valve flap blocks the air flow channel again. Thus, only when the outside air pressure is inconsistent with the air pressure inside the battery cavity, the air flow channel will be conductive to balance the pressure. When the outside air pressure is balanced with the air pressure inside the battery cavity, the air flow channel is always blocked, and the water vapor entering the air flow channel is isolated outside the box body by the water-blocking valve flap, which can effectively reduce the water vapor entering the battery cavity, and at the same time does not affect the gas flow to balance the air pressure, which is beneficial to avoiding a large amount of condensation in the battery cavity on the premise of ensuring the pressure balance in the battery cavity and improving the operation safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments in line with the present application, and are used together with the specification to explain the principles of the present application.

[0031] Figure 1 is a schematic structural diagram of the explosion-proof valve provided by the embodiment of the present application;

[0032] Figure 2 is Figure 1 the sectional view taken along the line A-A of the explosion-proof valve in

[0033] Figure 3 is a schematic structural diagram of the mounting bracket of the explosion-proof valve provided by the embodiment of the present application;

[0034] Figure 4 is Figure 3 the structural diagram from another angle;

[0035] Figure 5 is Figure 4 the sectional view taken along the line B-B of the explosion-proof valve in

[0036] Figure 6 is a schematic structural diagram of the water-blocking valve flap of the explosion-proof valve provided by the embodiment of the present application;

[0037] Figure 7 is Figure 6 the sectional view taken along the line C-C of the water-blocking valve flap in

[0038] Figure 8 Schematic structural diagram of the water-blocking valve provided by another embodiment of the present application;

[0039] Figure 9 is Figure 8 Cross-sectional view of the water-blocking valve in the D-D direction in

[0040] Figure 10 Schematic structural diagram of the pressure block of the explosion-proof valve provided by an embodiment of the present application;

[0041] Figure 11 is Figure 10 Schematic structural diagram of the pressure block from another angle in

[0042] Figure 12 is Figure 11 Cross-sectional view of the pressure block in the E-E direction in

[0043] Figure 13 Schematic structural diagram of the pressure block provided by another embodiment of the present application;

[0044] Figure 14 is Figure 13 Schematic structural diagram of the pressure block from another angle in

[0045] Figure 15 is Figure 14 Cross-sectional view of the pressure block in the F-F direction in

[0046] Figure 16 Schematic structural diagram of the molecular sieve of the explosion-proof valve provided by an embodiment of the present application;

[0047] Figure 17 Schematic structural diagram of the valve body of the explosion-proof valve provided by an embodiment of the present application;

[0048] Figure 18 is Figure 17 Cross-sectional view of the valve body in the G-G direction in

[0049] Figure 19 Schematic structural diagram of the upper cover of the explosion-proof valve provided by an embodiment of the present application;

[0050] Figure 20 is Figure 19 Cross-sectional view of the cover body in the H-H direction in

[0051] Description of reference numerals:

[0052] 100 - explosion-proof valve;

[0053] 110 - Valve housing; 111 - Valve body; 1111 - Ring groove; 1112 - Clamping structure; 1113 - Groove; 1114 - Fixed buckle; 1115 - Ventilation gap; 112 - Upper cover; 1121 - Top wall; 1122 - Side wall; 1122a - Clamping and mating structure;

[0054] 120 - Waterproof and breathable membrane;

[0055] 130 - Water-blocking valve; 131 - Deformed convex part; 1311 - Ventilation hole; 132 - Second through hole; 133 - Sub-region; 1331 - Water-absorbing structure;

[0056] 140 - Mounting bracket; 141 - Support plate; 1411 - Deformation guiding hole; 1412 - First air flow hole; 1413 - First through hole; 142 - Side plate;

[0057] 150 - Pressing block; 151 - Block body; 1511 - Second air flow hole; 1512 - Pressing convex part; 1513 - Mounting groove; 152 - Fixed column;

[0058] 160 - Molecular plug.

[0059] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0060] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0061] As shown in the background art, a waterproof and breathable membrane is provided on the explosion-proof valve of the prior art to prevent liquid water from entering the interior of the battery pack. At the same time, the waterproof and breathable membrane also has good air permeability and can balance the pressure inside and outside the battery pack. However, the waterproof and breathable membrane cannot prevent water vapor from entering the interior of the battery pack, and the condensation formed after the water vapor enters the battery pack will cause the insulation resistance to decrease, posing a safety hazard.

[0062] In view of the above technical problems, an embodiment of the present application provides an explosion-proof valve, a box body assembly of a battery pack, a battery pack and an electrical device. The valve housing is fixed to the box body of the battery pack. The explosion-proof valve defines an air flow channel on the valve housing, and the air flow channel communicates with the battery cavity in the box body to balance the air pressure inside and outside the box body. A water-blocking valve flap is arranged on the air flow channel to block the water vapor outside the box body from entering the box body. When the external air pressure is balanced with the air pressure in the battery cavity, the air flow channel is blocked by the water-blocking valve flap, so that the exchange of external gas and the gas in the battery cavity can be prevented, which is beneficial to preventing the external water vapor from entering the battery cavity. When the external air pressure is inconsistent with the air pressure in the battery cavity, the water-blocking valve flap deforms to make the air flow channel conductive. At this time, the battery cavity exchanges gas with the outside until the external air pressure is balanced with the air pressure in the battery cavity, and the water-blocking valve flap blocks the air flow channel again. Thus, only when the external air pressure is inconsistent with the air pressure in the battery cavity, the air flow channel will be conductive to balance the pressure. When the external air pressure is balanced with the air pressure in the battery cavity, the air flow channel is always blocked, and the water vapor entering the air flow channel is isolated outside the battery cavity by the water-blocking valve flap, which can effectively reduce the water vapor entering the battery cavity and does not affect the gas flow to balance the air pressure, which is beneficial to avoiding a large amount of condensation in the battery cavity on the premise of ensuring the pressure balance in the battery cavity and improving the operation safety of the battery pack.

[0063] The following uses specific embodiments to elaborate in detail on the technical solution of the present application and how the technical solution of the present application solves the above technical problems. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following will describe the embodiments of the present application with reference to the accompanying drawings:

[0064] It should be noted that the explosion-proof valve provided by the embodiment of the present application can be applied to various different battery packs.

[0065] See Figure 1 and Figure 2 As shown in

[0066] The explosion-proof valve 100 of the embodiment of the present application for a battery pack includes: a valve housing 110 and a water-blocking valve flap 130.

[0067] In the embodiment of the present application, the explosion-proof valve 100 is fixed on the box body of the battery pack through the valve housing 110, and the air flow channel communicates the battery chamber with the external environment to balance the air pressure inside and outside the box body. A water-blocking valve flap 130 is arranged between the waterproof breathable membrane 120 and the battery chamber. When the external air pressure is balanced with the air pressure inside the battery chamber, the water-blocking valve flap 130 will block the air flow channel to close the battery chamber, thereby preventing external gas from entering the battery chamber. The water vapor entering the air flow channel will be blocked by the water-blocking valve flap 130 outside the battery chamber, thus avoiding the condensation of water vapor in the battery chamber. Even if the water vapor condenses into liquid water in the air flow channel, due to the blockage of the water-blocking valve flap 130, the liquid water still cannot enter the battery chamber.

[0068] When the external air pressure is inconsistent with the air pressure inside the battery chamber, the water-blocking valve flap 130 will deform to make the air flow channel conductive, and the external gas exchanges with the gas inside the battery chamber to balance the internal and external pressures of the box body. When the external air pressure is balanced with the air pressure inside the battery chamber, the water-blocking valve flap 130 blocks the air flow channel again to prevent further gas exchange.

[0069] In this way, under the action of the water-blocking valve flap 130 of the explosion-proof valve 100 in the embodiment of the present application, the air flow channel will be conductive only when the air pressure inside the battery chamber is inconsistent with the external air pressure. In other states, the air flow channel is always blocked, and the battery chamber always remains closed. This can not only ensure the balance of the air pressure inside and outside the box body of the battery pack, but also effectively reduce the gas exchange between the battery chamber and the external environment, thereby reducing the water vapor entering the battery chamber, which is beneficial to preventing a large amount of water vapor from condensing in the battery chamber, ensuring the performance of the battery pack, and improving the safety of the battery pack operation.

[0070] In some implementable ways, as shown in Figure 1 and Figure 2 shown, the water-blocking valve flap 130 in the embodiment of the present application is an elastic member, and the water-blocking valve flap 130 is configured to deform under the action of air pressure to make the air flow channel conductive or blocked.

[0071] In specific implementation, the water-blocking valve flap 130 is set as an elastic member. When the external air pressure is inconsistent with the air pressure inside the battery chamber, pressure will be generated on the water-blocking valve flap 130, and the water-blocking valve flap 130 will deform, thereby making the air flow channel conductive. When the external air pressure is balanced with the air pressure inside the battery chamber, the water-blocking valve flap 130 is no longer under the action of pressure and thus returns to its original position to block the air flow channel again. In this way, the internal and external air pressures of the battery pack box body can be balanced in a timely manner, ensuring the safe and stable operation of the battery pack.

[0072] In some implementable ways, as shown in Figures 1 to 5 shown, the embodiment of the present application further includes: a mounting bracket 140, which is arranged in the air flow channel and fixedly connected to the valve housing 110, and the water-blocking valve flap 130 is connected to the mounting bracket 140.

[0073] It is understandable that the water-blocking valve 130 is fixed in the air flow channel by the mounting bracket 140, and the mounting bracket 140 plays a role in supporting the water-blocking valve 130, which can prevent the water-blocking valve 130 from shifting under pressure when the external air pressure is inconsistent with the air pressure in the battery chamber, which is conducive to ensuring the stability of the water-blocking valve 130. The water-blocking valve 130 and the mounting bracket 140 can be partially fixed by gluing or other methods to maintain the stability of the water-blocking valve 130, or the water-blocking valve 130 can be pressed against the mounting bracket 140 by only using a pressing block 150 or other structures. The embodiment of the present application does not limit the specific connection method between the water-blocking valve 130 and the mounting bracket 140, and it is sufficient to ensure that the water-blocking valve 130 will not shift due to the pressure difference between the inside and outside of the box.

[0074] In some possible implementations, see Figures 1 to 6 As shown, the mounting bracket 140 of the embodiment of the present application includes: a support plate 141, a deformation guide hole 1411 and a first air flow hole 1412 are provided on the support plate 141, the first air flow hole 1412 is provided on the peripheral side of the deformation guide hole 1411, and the water blocking valve 130 is provided on the side of the support plate 141 that is away from the box body, and the water blocking valve 130 includes a first deformation area and a second deformation area, the first deformation area is opposite to the first air flow hole, and the second deformation area is opposite to the deformation guide hole 1411 and is provided with an openable and closable air hole 1311; the water blocking valve 130 is configured to cover the first air flow hole 1412 when the external air pressure is greater than the battery cavity air pressure, and the air hole 1311 is opened, and when the external air pressure is less than the battery cavity air pressure, the water blocking valve 130 is separated from the first air flow hole 1412, and the air hole 1311 is closed.

[0075] It can be understood that when the external air pressure is greater than the air pressure in the battery cavity, the water-blocking valve 130 is subjected to pressure toward the battery cavity. At this time, the first deformation area of ​​the water-blocking valve 130 is pressed against the first air hole 1412, and the first air hole 1412 is closed, while the second deformation area is deformed under the action of pressure to open the air hole 1311, and the external air enters the battery cavity through the air hole 1311 to maintain balance. When the external air pressure is less than the air pressure in the battery cavity, the second deformation area closes the air hole 1311 under the action of pressure, and the first deformation area moves away from the first air hole 1412 under the action of pressure, so that the first air hole 1412 is connected, and the gas inside the battery cavity can enter the external environment through the first air hole 1412 through the air flow channel, thereby releasing the pressure inside the battery cavity.

[0076] Thus, when the external gas can enter the battery chamber through the air vent 1311 only when the external air pressure is greater than the air pressure in the battery chamber, the path for water vapor to enter the battery chamber is restricted. An absorbent material or the like can be provided in the deformation guiding hole 1411 or the second deformation region to accurately absorb the water vapor and further reduce the amount of water vapor entering the battery chamber. Of course, the specific structure at the deformation guiding hole 1411 or the second deformation region is not limited in the embodiments of the present application, as long as it can ensure that the water vapor mainly enters the battery chamber through the air vent 1311.

[0077] In some implementable ways, as shown in Figures 1 to 6 FIG. 5, in the radial direction of the air flow channel of the embodiment of the present application and in the direction from the outside to the inside, the support plate 141 extends obliquely toward the side close to the box body, and the deformation guiding hole 1411 is located at the bottom end of the support plate 141.

[0078] It should be noted that the air vent 1311 is located at the center of the water blocking valve 130, and the deformation guiding hole 1411 is located at the center of the support plate 141. The support plate 141 is arranged to be inclined from the outside to the inside, so that the inclination direction of the support plate 141 is consistent with the deformation directions of the two parts of the water blocking valve 130, so as to guide the water blocking valve 130 to deform at the air vent 1311 when a force toward the battery chamber is applied, and to deform at the first deformation region when a force away from the battery chamber is applied.

[0079] In some implementable ways, as shown in Figures 1 to 6 and Figures 10 to 12 FIG. 6, a first through hole 1413 is further provided on the support plate 141 of the embodiment of the present application on the periphery of the deformation guiding hole 1411, and a second through hole 132 opposite to the first through hole 1413 is provided on the water blocking valve 130;

[0080] The explosion-proof valve 100 further includes: a pressing block 150. The pressing block 150 includes a block main body 151 and a fixing column 152. The block main body 151 is arranged on the side of the water blocking valve 130 facing away from the support plate 141. The fixing column 152 is connected to the block main body 151 and passes through the first through hole 1413 and the second through hole 132. The block main body 151 is in pressing contact with the water blocking valve 130. Moreover, a second air flow hole 1511 is provided on the block main body 151, and the second air flow hole 1511 is communicated with the deformation guiding hole 1411.

[0081] Specifically, the fixing post 152 passes through the first through hole 1413 and the second through hole 132 and is fixedly connected to the mounting bracket 140. The pressing block 150 can be fixed to the mounting bracket 140 by means of snap connection, hot melting, etc. The embodiments of the present application do not limit the specific connection method, as long as it is ensured that the pressing block 150 will not move relative to the mounting bracket 140. Thus, the deformed convex portion 131 of the water-blocking valve 130 is pressed tightly against the mounting bracket 140 to prevent the water-blocking valve 130 from shifting, ensuring that the ventilation hole 1311 corresponds to the deformation guiding hole 1411. At the same time, when the external air pressure is less than the air pressure in the battery cavity, the water-blocking valve 130 is subjected to a pressure away from the battery cavity, and the second deformation region is pressed tightly against the block body 151. The block body 151 blocks the ventilation hole 1311, so that the ventilation hole 1311 is closed, and the first deformation region deforms and moves away from the first air flow hole 1412, so that the first air flow hole 1412 is conducted, ensuring that the gas in the battery cavity enters the outside through the first air flow hole 1412. When the external air pressure is greater than the air pressure in the battery cavity, the first deformation region fits with the support plate 141 to block the first air flow hole 1412. The external gas enters the second air flow hole 1511 to separate at least part of the second deformation region from the block body 151, and the ventilation hole 1311 is opened, and the gas enters the battery cavity through the ventilation hole 1311.

[0082] Therefore, the pressing block 150 can further fix the water-blocking valve 130 and define the gas flow path. In addition, the explosion-proof valve 100 of the embodiments of the present application is only provided with one water-blocking valve 130, and the deformation direction of the water-blocking valve 130 remains unchanged, so that the gas can flow in two opposite directions from the outside to the battery cavity and from the battery cavity to the outside. The structure is simple, which is beneficial to saving the maintenance cost of the explosion-proof valve 100.

[0083] In some implementable ways, as shown in Figures 1 to 6 and Figures 10 to 12 shown, at least part of the structure of the second deformation region of the embodiments of the present application is formed as a deformed convex portion 131. The deformed convex portion 131 faces the deformation guiding hole 1411, and the ventilation hole 1311 is formed in the deformed convex portion 131; a pressing convex portion 1512 adapted to extend into the deformation guiding hole 1411 is provided on the side of the block body 151 facing the water-blocking valve 130, and the pressing convex portion 1512 is used to press the deformed convex portion 131 into the deformation guiding hole 1411.

[0084] In specific implementation, the pressing convex part 1512 presses against the deformation convex part 131, thereby fixing the water-blocking valve membrane 130 on the mounting bracket 140. At the same time, the pressing convex part 1512 cooperates with the air-permeable holes 1311. When the deformation convex part 131 fits with the pressing convex part 1512, the air-permeable holes 1311 are blocked and closed by the pressing convex part 1512. When the external air pressure is greater than the air pressure in the battery cavity, the deformation convex part 131 is deformed by the force towards the battery cavity, and the deformation convex part 131 is separated from the pressing convex part 1512 to open the air-permeable holes 1311.

[0085] In some implementable ways, referring to Figures 1 to 6 and Figures 13 to 15 As shown, on the side of the block body 151 of the embodiment of the present application facing away from the water-blocking valve membrane 130, there is an installation groove 1513. The second air flow hole 1511 penetrates the bottom wall of the installation groove 1513. The explosion-proof valve 100 further includes: a molecular sieve 160, which is fixed in the installation groove 1513 and covers the second air flow hole 1511. The molecular sieve 160 is used to absorb external water vapor.

[0086] It can be understood that since the external gas can only enter the battery cavity through the second air flow hole 1511 and the air-permeable hole 1311 in sequence, an installation groove 1513 can be opened at a position on the block body 151 corresponding to the second air flow hole 1511, and the molecular sieve 160 is placed in the installation groove 1513. The molecular sieve 160 has strong adsorption, can absorb the water vapor passing through it but does not affect the passage of other gases. In this way, as long as the external gas enters the battery cavity, it will definitely pass through the molecular sieve 160 first, and the molecular sieve 160 absorbs the water vapor, thereby effectively reducing the water vapor content in the external gas and preventing a large amount of water vapor from entering the battery cavity, which is beneficial to ensuring the safe and stable operation of the battery pack.

[0087] In some implementable ways, referring to Figures 1 to 5 As shown, the mounting bracket 140 of the embodiment of the present application includes: side plates 142, which surround the peripheral side of the support plate 141 and are connected to the valve housing 110.

[0088] In some embodiments, the mounting bracket 140 is fixedly connected to the valve housing 110 through the side wall 1122 to ensure that the position of the water-blocking valve membrane 130 on the support plate 141 remains unchanged and improve the structural stability.

[0089] In some implementable ways, referring to Figures 1 to 5 and Figure 17 and Figure 18 As shown, an annular groove 1111 surrounding the air flow channel is provided in the channel wall of the air flow channel of the embodiment of the present application, and the side plate 142 is fixed in the annular groove 1111.

[0090] In specific implementation, a ring groove 1111 surrounding the air flow channel is formed on the valve housing 110, and at least a part of the side plate 142 of the mounting bracket 140 is located in the ring groove 1111, so as to define the position of the support plate 141, which is beneficial to ensuring that the positions of the air permeable holes 1311 of the water blocking valve 130 and the first air holes 1412 of the mounting bracket 140 correspond to the opening of the battery cavity, avoiding dislocation and affecting the sealing performance of the water blocking valve 130.

[0091] In some implementable ways, referring to Figure 1 , Figure 2 , Figure 6 and Figure 7 as shown, the water blocking valve 130 of the embodiment of the present application includes a plurality of sub-regions 133 distributed radially along the valve housing 110. Each sub-region 133 includes an inner edge and an outer edge opposite to each other in the radial direction. Among them, in two adjacent sub-regions 133, the outer edge of the sub-region 133 closer to the inside protrudes from the inner edge of the sub-region 133 closer to the outside.

[0092] In this way, the water blocking valve 130 is integrally corrugated. When the external air pressure is inconsistent with the air pressure in the battery cavity, resulting in pressure on the water blocking valve 130, part of the pressure will be dispersed to the edges of each sub-region 133. The outer edge of the sub-region 133 closer to the inside protrudes from the inner edge of the sub-region 133 closer to the outside, so as to better define the deformation direction of the water blocking valve 130 and ensure that the gas flow paths are different when the external air pressure is greater than and less than the air pressure in the battery cavity.

[0093] In some implementable ways, referring to Figure 1 , Figure 2 , Figure 8 and Figure 9 as shown, a plurality of water absorption structures 1331 are provided on the surface of the water blocking valve 130 of the embodiment of the present application facing away from the box body.

[0094] It can be understood that setting a plurality of water absorption structures 1331 can further absorb the water vapor in the gas entering the air flow channel from the outside, thereby reducing the water vapor content entering the battery cavity and avoiding a large amount of water vapor condensing into liquid water in the battery cavity, which is beneficial to improving the performance of the battery pack.

[0095] In some implementable ways, referring to Figure 1 , Figure 2 , Figure 8 and Figure 9 as shown, the plurality of water absorption structures 1331 of the embodiment of the present application are divided into multiple groups distributed radially along the water blocking valve 130, and each group includes a plurality of water absorption structures 1331 distributed circumferentially along the water blocking valve 130.

[0096] In some embodiments, multiple groups of water absorption structures 1331 are evenly distributed on the water blocking valve flap 130, which can absorb the water vapor in the air flow channel in all directions to ensure that the content of water vapor in the gas entering the battery cavity from the outside is reduced, which is beneficial to further improve the safety of the battery pack.

[0097] In some implementable ways, referring to Figure 2 as shown, the water blocking valve flap 130 of the embodiment of the present application includes a silica gel part.

[0098] It can be understood that the silica gel part has good sealing performance and waterproof performance. When the external air pressure is balanced with the air pressure in the battery cavity, it can effectively seal the battery cavity to prevent water vapor from entering. At the same time, the silica gel part has a certain elasticity and can undergo elastic deformation under the action of pressure to balance the internal and external air pressures of the battery pack box body and ensure the safe operation of the battery pack.

[0099] In some implementable ways, referring to Figure 1 、 Figure 2 and Figures 17 to 20 as shown, the valve housing 110 of the embodiment of the present application includes: a valve body 111 and an upper cover 112. The inner wall of the valve body 111 defines an air flow channel, and the valve body 111 is provided with a clamping structure 1112; an upper cover 112 covers the outside of the valve body 111, and the upper cover 112 is provided with a clamping and cooperating structure 1122a. The upper cover 112 and the valve body 111 are clamped and cooperated through the clamping structure 1112 and the clamping and cooperating structure 1122a.

[0100] In specific implementation, the valve body 111 is connected to the box body of the battery pack, and the upper cover 112 covers the outside of the valve body 111 to protect the valve housing 110 and ensure that the explosion-proof valve 100 is not damaged. At the same time, the connection between the upper cover 112 and the valve body 111 is a clamping and cooperating connection rather than a fixed connection by welding or other means. When a large amount of gas suddenly generates in the battery pack, the clamping and cooperating connection between the upper cover 112 and the valve body 111 fails, and the upper cover 112 falls off, so that the gas can quickly escape through the air flow, avoiding the explosion of the battery pack and being beneficial to improving the safety performance of the battery pack.

[0101] Among them, the specific shapes of the valve body 111, the upper cover 112, the mounting bracket 140 and the water blocking valve flap 130 are not limited in the embodiment of the present application. The valve body 111, the upper cover 112, the mounting bracket 140 and the water blocking valve flap 130 only need to be able to match each other. Exemplarily, the water blocking valve flap 130, the valve body 111, the upper cover 112 and the mounting bracket 140 are all rotary bodies. In this way, there is no direction limit when assembling the explosion-proof valve 100, which is more convenient for installation and beneficial to improving the assembly efficiency.

[0102] In some implementable ways, referring to Figure 1 、 Figure 2 and Figures 17 to 20As shown, the snap - fit structure 1112 of the embodiment of the present application is formed as a snap - fit protrusion, and the snap - fit cooperation structure 1122a is formed as a groove, and the snap - fit protrusion is snapped into the groove.

[0103] In a specific implementation, the snap - fit protrusion is snapped into the groove to fix the upper cover 112 on the valve body 111. When the temperature of the battery pack suddenly increases, the snap - fit protrusion softens and fails, so that the upper cover 112 falls off, so that the high - pressure gas in the battery pack can be quickly discharged.

[0104] In some implementable ways, referring to Figure 1 、 Figure 2 and Figures 17 to 20 As shown, the snap - fit structure 1112 of the embodiment of the present application is formed on the outer peripheral wall of the valve body 111; the upper cover 112 includes a side wall 1122 and a top wall 1121, the snap - fit cooperation structure 1122a is formed on the side wall 1122, the side wall 1122 is spaced from the outer peripheral wall, and the top wall 1121 is spaced from the top end face of the valve body 111, so as to form a ventilation gap 1115 between the upper cover 112 and the valve body 111, and the air flow channel communicates with the outside through the ventilation gap 1115.

[0105] It can be understood that a certain interval is maintained between the upper cover 112 and the valve body 111 to form the ventilation gap 1115, which can not only ensure the air pressure balance inside and outside the battery pack box, avoid potential safety hazards caused by inconsistent air pressure between the battery cavity and the outside, but also does not affect the protective effect of the upper cover 112 on the valve body 111.

[0106] In some implementable ways, referring to Figure 1 、 Figure 2 and Figures 17 to 20 As shown, the embodiment of the present application further includes a waterproof and breathable membrane 120, which is arranged in the air flow channel and is located on the side away from the box body of the water - blocking valve flap 130.

[0107] It can be understood that the waterproof and breathable membrane 120 can block liquid water from entering the battery cavity and does not prevent the passage of gas, so as to ensure the circulation of gas inside and outside the battery cavity and ensure the balance of air pressure. Therefore, water vapor can normally pass through the waterproof and breathable membrane 120, and the water - blocking valve flap 130 can prevent water vapor from entering the battery cavity and condensing into liquid water, affecting the performance of the battery pack. Therefore, the waterproof and breathable membrane 120 and the water - blocking valve flap 130 respectively prevent liquid water and gaseous water from entering the battery cavity, forming a double protection, which is beneficial to further improving the safety and stability of the battery pack operation.

[0108] In some implementable ways, referring to Figure 1 、 Figure 2 and Figures 17 to 20 As shown, a groove 1113 is provided on the top end face of the valve body 111 of the embodiment of the present application, and the waterproof and breathable membrane 120 is fixedly arranged in the groove 1113.

[0109] It should be noted that the waterproof and breathable membrane 120 is fixed on the valve body 111, and the water-blocking valve flap 130 is located between the waterproof and breathable membrane 120 and the battery chamber. The waterproof and breathable membrane 120 first blocks the external liquid water, and then the water-blocking valve flap 130 blocks the water vapor in the external gas. The double protection can better avoid the occurrence of condensation in the battery chamber, thereby facilitating the safe and stable operation of the battery pack and improving the performance of the battery pack.

[0110] In some implementable ways, as shown in Figure 1 , Figure 2 , Figure 17 and Figure 18 shown, the valve body 111 of the embodiment of the present application is further provided with a fixing buckle 1114 for connecting with the box body of the battery pack.

[0111] Specifically, the valve body 111 is snap-connected to the battery pack box body through the fixing buckle 1114, thereby fixing the explosion-proof valve 100 on the battery pack. The structure is simple and convenient for installation. And when the temperature in the battery chamber suddenly increases, the high-temperature environment in the battery chamber causes the fixing buckle 1114 to soften, so that the entire explosion-proof valve 100 falls off, and the gas in the battery chamber quickly escapes, which helps to prevent the battery pack from exploding and improves the safety of the battery pack. At the same time, the structure of the valve body 111 is simple, which is convenient for the assembly of the explosion-proof valve 100 and is beneficial to reducing the maintenance cost of the explosion-proof valve 100.

[0112] As shown in Figure 1 and Figure 2 shown, the embodiment of the present application further provides a box body assembly of a battery pack, including: a box body and any one of the above explosion-proof valves 100. The box body defines a battery chamber; the valve shell 110 of the explosion-proof valve 100 is fixedly connected to the box body, and the air flow channel of the explosion-proof valve 100 is used to communicate the battery chamber and the outside.

[0113] Among them, the structure and working principle of the explosion-proof valve 100 have been described in detail in the above embodiments, and will not be elaborated here one by one.

[0114] In the embodiment of the present application, the air flow channel is used to maintain the internal and external balance of the box body during the normal operation of the battery pack, and at the same time can prevent water vapor and liquid water from entering the battery chamber. When a large amount of gas suddenly generates in the battery chamber, the explosion-proof valve 100 falls off and the gas in the battery chamber quickly escapes, which is beneficial to preventing the battery pack from exploding due to excessive pressure in the battery chamber and improves the safety of the battery pack.

[0115] As shown in Figure 1 shown, the embodiment of the present application further provides a battery pack, including: the above box body assembly and a battery module, and the battery module is arranged in the battery chamber.

[0116] In the embodiment of the present application, the battery module is disposed in the battery cavity. If condensation occurs in the battery cavity or the insulation resistance of the battery module is reduced or even short-circuited, it will cause potential safety hazards. Therefore, the above-mentioned box body assembly is provided. The explosion-proof valve 100 can prevent water vapor and liquid water from entering the battery cavity, thereby ensuring the safe and stable operation of the battery pack.

[0117] The embodiment of the present application also provides an electrical device, including: an electrical device and the above-mentioned battery pack, and the battery pack is used to supply power to the electrical device.

[0118] In the embodiment of the present application, applying the above-mentioned battery pack to an electrical device is beneficial to improving the performance of the electrical device and enhancing the safety of using the electrical device.

[0119] In summary, the embodiment of the present application provides an explosion-proof valve 100, a box body assembly of a battery pack, a battery pack and an electrical device. Among them, the explosion-proof valve 100 includes a valve housing 110, a waterproof breathable membrane 120, a water-blocking valve flap 130, a mounting bracket 140 and a pressing block 150. The explosion-proof valve 100 is fixed on the box body through the valve housing 110. An air flow channel communicating the battery cavity of the battery pack and the outside is formed in the valve housing 110. Both the waterproof breathable membrane 120 and the water-blocking valve flap 130 are located in the air flow channel. The water-blocking valve flap 130 is fixed on the mounting bracket 140 through the pressing block 150 and is fixed in the air flow channel through the mounting bracket 140. When the external air pressure is balanced with the air pressure in the battery cavity, the first deformation area of the water-blocking valve flap 130 fits with the mounting bracket 140, and the second deformation area fits with the pressing block 150, thereby closing the air flow channel to prevent gas from entering the battery cavity. When the external air pressure is less than the air pressure in the battery cavity, the first deformation area deforms under the action of the air pressure and is partially separated from the mounting bracket 140, so that the gas in the battery cavity enters the air flow channel through the first air hole 1412 of the mounting bracket 140. When the external air pressure is greater than the air pressure in the battery cavity, the second deformation area deforms under the action of the air pressure, and the second deformation area is partially separated from the pressing block 150, so that the air hole 1311 of the water-blocking valve flap 130 is opened. The external gas enters the battery cavity in sequence through the waterproof breathable membrane 120, the second air hole 1511 of the pressing block 150 and the air hole 1311 to balance the air pressure. Therefore, for the explosion-proof valve 100 provided in the embodiment of the present application, the external gas will enter the battery cavity only when the external air pressure is greater than the air pressure in the battery cavity, reducing the gas exchange between the battery cavity and the outside, which is beneficial to reducing the water vapor content in the battery cavity, thereby improving the safety and stability of the battery pack operation.

[0120] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0121] The device or component referred to in the embodiments of the present application or implied must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless otherwise precisely and specifically defined.

[0122] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and the above-mentioned drawings of the embodiments of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0123] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0124] The term "a plurality" in this article refers to two or more. The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0125] It can be understood that in the embodiments of the present application, the various numerical numbers involved are only for the convenience of description and do not limit the scope of the embodiments of the present application.

[0126] It can be understood that in the embodiments of the present application, the magnitude of the sequence numbers of the above processes does not mean the sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0127] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0128] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. An explosion-proof valve (100), characterized in that: include: A valve housing (110) is used for being fixedly connected to the box body, the valve housing (110) defining an air flow channel, the air flow channel being used for balancing the air pressure inside and outside the box body; The water-blocking valve (130) is arranged in the airflow passage, and the water-blocking valve (130) is configured to block the airflow passage when the air pressure inside and outside the box is balanced, and to open the airflow passage when there is a pressure difference between the air pressure inside and outside the box.

2. The explosion-proof valve (100) according to claim 1, characterized in that: The water-blocking valve (130) is an elastic member, and the water-blocking valve (130) is configured to deform under the action of air pressure so as to open or block the airflow channel.

3. The explosion-proof valve (100) according to claim 2, characterized in that: Also includes: A mounting bracket (140) is disposed in the air flow channel and fixedly connected to the valve housing (110). The water-blocking valve (130) is connected to the mounting bracket (140).

4. The explosion-proof valve (100) according to claim 3, characterized in that: The mounting bracket (140) comprises a support plate (141), the support plate (141) being provided with a deformation guide hole (1411) and a first air flow hole (1412), the first air flow hole (1412) being provided on the peripheral side of the deformation guide hole (1411); The water-blocking valve (130) is arranged on a side of the support plate (141) facing away from the box body, and the water-blocking valve (130) comprises a first deformation area and a second deformation area, the first deformation area is opposite to the first air flow hole (1412), and the second deformation area is opposite to the deformation guide hole (1411) and is provided with an openable and closable air hole (1311); The water-blocking valve (130) is constructed such that, when the external air pressure is greater than the air pressure inside the box, the first deformation region covers the first air flow hole (1412), and the second deformation region deforms to open the air vent (1311); and when the external air pressure is less than the air pressure inside the box, the first deformation region deforms to open the first air flow hole (1412), and the air vent (1311) is closed.

5. The explosion-proof valve (100) according to claim 4, characterized in that: Along the radial direction of the airflow channel and in a direction from outside to inside, the support plate (141) extends obliquely toward a side close to the box body, and the deformation guide hole (1411) is located at the bottom end of the support plate (141).

6. The explosion-proof valve (100) according to claim 4, characterized in that: The support plate (141) is further provided with a first through hole (1413) located on the peripheral side of the deformation guide hole (1411), and the water-blocking valve (130) is provided with a second through hole (132) opposite to the first through hole (1413); The explosion-proof valve (100) further comprises: The pressing block (150) comprises a block body (151) and a fixing column (152), wherein the block body (151) is arranged on a side of the water-blocking valve (130) facing away from the support plate (141), the fixing column (152) is connected to the block body (151) and is penetrated through the first through hole (1413) and the second through hole (132), the block body (151) is in pressing contact with the water-blocking valve (130), and the block body (151) is provided with a second air flow hole (1511), and the second air flow hole (1511) is in communication with the deformation guide hole (1411).

7. The explosion-proof valve (100) according to claim 6, characterized in that: At least part of the structure of the second deformation area is formed as a deformation convex portion (131), the deformation convex portion (131) is opposite to the deformation guide hole (1411), and the air vent (1311) is formed in the deformation convex portion (131); A pressing convex portion (1512) suitable for extending into the deformation guide hole (1411) is provided on one side of the block body (151) facing the water-blocking valve (130), and the pressing convex portion (1512) is used to press the deformation convex portion (131) into the deformation guide hole (1411).

8. The explosion-proof valve (100) according to claim 7, characterized in that: A mounting groove (1513) is provided on a side of the block body (151) facing away from the water-blocking valve (130), and the second air flow hole (1511) penetrates the bottom wall of the mounting groove (1513). The explosion-proof valve (100) further comprises: a molecular plug (160), wherein the molecular plug (160) is fixed in the mounting groove (1513) and covers the second air flow hole (1511), and the molecular plug (160) is used to absorb external water vapor.

9. The explosion-proof valve (100) according to claim 4, characterized in that: The mounting bracket (140) comprises a side plate (142) which is arranged around the peripheral side of the support plate (141) and is connected to the valve housing (110).

10. The explosion-proof valve (100) according to claim 9, characterized in that: An annular groove (1111) surrounding the airflow channel is provided in the channel wall of the airflow channel, and the side plate (142) is fixed in the annular groove (1111).

11. The explosion-proof valve (100) according to claim 1, characterized in that: The water-blocking valve (130) comprises a plurality of sub-regions (133) distributed along the radial direction of the valve housing (110), each sub-region (133) comprising an inner edge and an outer edge opposite to each other along the radial direction. Among the two adjacent sub-regions (133), the outer edge of the sub-region (133) closer to the inner side protrudes beyond the inner edge of the sub-region (133) closer to the outer side.

12. The explosion-proof valve (100) according to claim 1, characterized in that: A plurality of water absorption structures (1331) are provided on a surface of the water-blocking valve (130) on one side facing away from the box body.

13. The explosion-proof valve (100) according to claim 12, characterized in that: The plurality of water absorption structures (1331) are divided into a plurality of groups distributed along the radial direction of the water blocking valve (130), and each group comprises a plurality of water absorption structures (1331) distributed along the circumferential direction of the water blocking valve (130).

14. The explosion-proof valve (100) according to claim 1, characterized in that: The water-blocking valve (130) comprises a silicone member.

15. The explosion-proof valve (100) according to claim 1, characterized in that: The valve housing (110) comprises: A valve body (111), wherein the inner wall of the valve body (111) defines the airflow channel, and a clamping structure (1112) is provided on the valve body (111); An upper cover (112) is arranged on the outside of the valve body (111), and the upper cover (112) is provided with a snap-fitting structure (1122a). The upper cover (112) and the valve body (111) are snap-fitted via the snap-fitting structure (1112) and the snap-fitting structure (1122a).

16. The explosion-proof valve (100) according to claim 15, characterized in that: The snap-fit ​​structure (1112) is formed as a snap-fit ​​protrusion, the snap-fit ​​matching structure (1122a) is formed as a snap-fit ​​groove, and the snap-fit ​​protrusion is snap-fitted into the snap-fit ​​groove.

17. The explosion-proof valve (100) according to claim 15, characterized in that: The clamping structure (1112) is formed on the outer peripheral wall of the valve body (111); The upper cover (112) comprises a side wall (1122) and a top wall (1121); the snap-fitting structure (1122a) is formed on the side wall (1122); the side wall (1122) is spaced from the peripheral wall; the top wall (1121) is spaced from the top end face of the valve body (111), so that a ventilation gap (1115) is formed between the upper cover (112) and the valve body (111); and the air flow channel is connected to the outside through the ventilation gap (1115).

18. The explosion-proof valve (100) according to claim 1, characterized in that: Also includes: The waterproof and breathable membrane (120) is arranged in the air flow channel and is located on a side of the water-blocking valve (130) away from the box body.

19. The explosion-proof valve (100) according to claim 18, characterized in that: The valve housing (110) comprises a valve body (111), the inner wall of the valve body (111) defining the air flow channel, a top end surface of the valve body (111) being provided with a groove (1113), and the waterproof breathable membrane (120) being fixedly disposed in the groove (1113).

20. The explosion-proof valve (100) according to claim 15, characterized in that: The valve body (111) is also provided with a fixing buckle (1114) for connecting with the box body.

21. A box assembly of a battery pack, characterized in that: include: A box body defining a battery cavity; The explosion-proof valve (100) according to any one of claims 1 to 20, wherein the valve housing (110) of the explosion-proof valve (100) is fixedly connected to the box body, and the air flow channel of the explosion-proof valve (100) is used to connect the battery cavity with the outside.

22. A battery pack, characterized in that: include: The box assembly according to claim 21; The battery module is arranged in the battery cavity.

23. An electrical equipment, characterized in that: include: Electrical installations; The battery pack as described in claim 22 is used to power the electrical device.

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