Pressure release valve assembly, top cover assembly, battery and electric equipment

Abstract

The invention provides a pressure release valve assembly, a top cover assembly, a battery and electric equipment. The pressure release valve assembly comprises a pressing plate, an elastic piece, a first sealing piece and a second sealing piece which are sequentially arranged in the first mounting groove of the top cover. The elastic piece elastically abuts against the position between the pressing plate and the first sealing piece, the second sealing piece is located between the first sealing piece and the bottom wall of the first installation groove, and the second sealing piece is further located on the outer edge of the air inlet hole in the top cover. When the air pressure at the air inlet hole is larger than or equal to a preset threshold value of the pressure release valve assembly, the first sealing piece is pushed by air at the air inlet hole to be separated from the second sealing piece. And then the gas is discharged out of the battery through the gas inlet hole, a first gas channel between the first sealing piece and the side wall of the first mounting groove, a second gas channel between the first sealing piece and the pressing plate, a third gas channel of the elastic piece and a gas outlet hole in the pressing plate. According to the technical scheme, the battery can be repeatedly exhausted on the basis of ensuring the service life of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a pressure relief valve assembly, a top cover assembly, a battery and an electrical device. Background Art

[0002] With the development of clean energy, batteries with recyclable characteristics are becoming more and more popular. During the use of the battery, chemical reactions inside the battery cell will produce a large amount of gas, so an explosion-proof valve structure is generally provided in the top cover assembly. The large amount of gas generated inside the battery cell can break through the explosion-proof valve and then be discharged to the outside of the battery. However, although the explosion-proof valve can discharge the gas to the outside of the battery by opening the valve, the opening of the explosion-proof valve can easily lead to a reduction in the life of the battery cell. Summary of the invention

[0003] The embodiments of the present application provide a pressure relief valve assembly, a top cover assembly, a battery and an electrical device, which can repeatedly exhaust the battery while ensuring the life of the battery cell.

[0004] In a first aspect, the present application provides a pressure relief valve assembly, the pressure relief valve assembly is used to be connected to a top cover, the top cover is provided with a first mounting groove and an air inlet hole in communication, the pressure relief valve assembly comprises a pressing plate, an elastic member, a first sealing member and a second sealing member sequentially arranged in the first mounting groove, the elastic member elastically abuts between the pressing plate and the first sealing member, the second sealing member is located between the first sealing member and a bottom wall of the first mounting groove, and the second sealing member is also located at an outer edge of the air inlet hole;

[0005] A first air passage is formed in a gap area between the first sealing member and the side wall of the first mounting groove, a second air passage is formed in a gap area between the first sealing member and the pressing plate, a third air passage is provided on the elastic member, and an air outlet is provided on the pressing plate, wherein the air outlet communicates with the inside of the pressure relief valve assembly and the outside of the pressure relief valve assembly;

[0006] When the air pressure at the air inlet is less than a preset threshold of the pressure relief valve assembly, the first sealing member is pressed against the second sealing member by the elastic member to seal the air inlet;

[0007] When the air pressure at the air inlet is greater than or equal to a preset threshold value of the pressure relief valve assembly, the first sealing member is pushed by the gas at the air inlet and separated from the second sealing member, and the air inlet, the first air channel, the second air channel, the third air channel and the air outlet are connected in sequence to form a gas channel for the gas at the air inlet to pass through.

[0008] During the use of the battery, chemical reactions inside the battery cell will produce a large amount of gas. Once the gas accumulates too much, it is easy to cause the battery to explode. Therefore, an explosion-proof valve assembly is generally provided in the top cover assembly. When the gas pressure inside the battery cell reaches a certain value, the gas will break through the explosion-proof valve assembly and be discharged to the outside of the battery, thereby preventing the battery from exploding due to excessive gas pressure inside. However, once the explosion-proof valve explodes, it cannot be used again, and the explosion of the explosion-proof valve will also greatly reduce the life of the battery cell.

[0009] Therefore, in the embodiment of the present application, by setting a pressure relief valve assembly in the top cover assembly, the battery can be repeatedly exhausted, and the impact on the battery cell during the exhaust process can be reduced. Specifically, when a certain amount of gas is generated inside the battery cell, causing the gas pressure formed by the gas entering the air inlet of the top cover to be greater than or equal to the preset threshold of the pressure relief valve assembly, the gas will pass through the air inlet of the top cover and the through hole on the second seal in turn, and then lift up the first seal, so that the first seal compresses the elastic member. The elastic member will move in the radial direction of the first seal under the pressure of the first seal, thereby reducing the height of the elastic member. As the first seal compresses the elastic member, the first seal is separated from the second seal. The gas will enter the first air channel between the first seal and the side wall of the top cover through the gap between the second seal and the first seal. Then enter the second air channel between the second seal and the pressure plate through the first air channel, and then diffuse to the third air channel of the elastic member, and finally be discharged to the outside of the battery through the air outlet of the pressure plate.

[0010] Alternatively, when passing through the second seal, the gas may also enter the gap between the second seal and the side wall of the top cover through the gap between the second seal and the bottom wall of the first mounting groove, and then enter the first air channel between the first seal and the side wall of the top cover.

[0011] When the air pressure at the air inlet is less than the preset threshold of the pressure relief valve assembly, the rebound force of the elastic member causes the first seal to be pressed against the second seal, so that the pressure relief valve assembly remains sealed, and the pressure relief valve assembly stops exhausting, and the pressure relief valve assembly is cyclically and reciprocally exhausted in one direction. Exemplarily, the preset threshold may be 0.2 MPa. Of course, in some other embodiments, the preset threshold may also be other values, which are not strictly limited.

[0012] In summary, when the gas generated inside the battery cell causes the air pressure entering the air inlet of the top cover to be greater than or equal to the preset threshold of the pressure relief valve assembly, the pressure relief valve assembly will start to exhaust the battery. When the air pressure at the air inlet of the top cover is less than the preset threshold of the pressure relief valve assembly, the pressure relief valve assembly will stop exhausting. That is, the pressure relief valve assembly can repeatedly exhaust the battery. This greatly improves the service life of the battery cell.

[0013] In a possible embodiment, the pressure plate includes a pressure plate body and a flange, the pressure plate body is provided with the air outlet, the flange is located on the side of the pressure plate body facing the elastic member, one end of the flange is connected to the outer edge of the air outlet, and the other end of the flange is projected into the pressure plate body along the thickness direction of the pressure plate, the flange is bent relative to the pressure plate body, and cooperates with the pressure plate body to form a first slot, and part of the elastic member is located in the first slot and abuts between the pressure plate body and the flange.

[0014] In a possible implementation manner, a second installation groove is recessed on a surface of the pressure plate body facing the elastic member, the second installation groove is communicated with the first clamping groove, and a portion of the elastic member is located in the second installation groove.

[0015] In a possible embodiment, the elastic member includes a first connecting portion and a plurality of legs, at least a portion of the first connecting portion is located in the first slot, and the plurality of legs are spaced apart in the circumferential direction of the first connecting portion, and each of the legs includes a first connecting end and a second connecting end, the first connecting end is fixedly connected to the outer edge of the first connecting portion, the second connecting end abuts against the first sealing member, and the second connecting end can move relative to the first sealing member along the radial direction of the first connecting portion.

[0016] In a possible embodiment, the elastic member also includes a second connecting portion, which is annular, and the second connecting end is fixedly connected to the inner edge of the second connecting portion. The second connecting portion and the first connecting portion are spaced apart in the thickness direction of the elastic member and abut against the first sealing member. The second connecting portion can move relative to the first sealing member along the radial direction of the first connecting portion.

[0017] In a possible embodiment, the third air duct includes a first sub-air duct and a second sub-air duct, the first sub-air duct is a gap area between two adjacent legs, the first sub-air duct is connected to the first air duct, the second sub-air duct is a through hole that penetrates the first connecting part along the thickness direction of the first connecting part, and the second sub-air duct is connected to the air outlet.

[0018] In a possible implementation manner, there is line contact between the elastic member and the first sealing member.

[0019] In a possible implementation manner, the first sealing member includes a first sealing body and a retaining wall;

[0020] The first sealing body comprises a first surface and a second surface, the first surface and the second surface are arranged opposite to each other in the thickness direction of the first sealing body, the first surface abuts against the elastic member, and the second surface abuts against the second sealing member;

[0021] The retaining wall is connected to the outer edge of the first sealing body and protrudes relative to the first surface. The retaining wall also surrounds a portion of the elastic member. The end of the retaining wall away from the first sealing body is spaced apart from the pressure plate. The gap area between the outer peripheral surface of the retaining wall and the side wall of the first mounting groove forms the first air channel.

[0022] In a possible implementation manner, a portion of the first surface that contacts the elastic member is a plane.

[0023] In a possible implementation manner, the second sealing member is in line contact with the first sealing member, and / or the second sealing member is in line contact with the first mounting groove.

[0024] In a possible embodiment, the second seal includes an inner ring body and an outer ring body, the inner ring body abuts between the first seal and the bottom wall of the first mounting groove, the outer ring body is connected to the outer edge of the inner ring body, and the thickness of the outer ring body is less than the thickness of the inner ring body.

[0025] In a second aspect, the present application also provides a top cover assembly, which includes a top cover and a pressure relief valve assembly as described above, wherein the top cover is provided with a first mounting groove and an air inlet hole which are connected to each other, and the pressure relief valve assembly is located in the first mounting groove and covers the air inlet hole.

[0026] In one possible embodiment, the first mounting groove includes a first groove and a second groove, the first groove and the second groove are coaxially arranged, the cross-sectional width of the first groove along the thickness direction of the top cover is greater than the cross-sectional width of the second groove along the thickness direction of the top cover, a first step surface is formed at the connection between the first groove and the second groove, the pressure plate is located in the first groove and abuts against the first step surface, the elastic member is located in the first groove and the second groove, and the first seal and the second seal are both located in the second groove.

[0027] In a third aspect, the present application further provides a battery, comprising a battery cell, a shell and a top cover assembly as described above, wherein the top cover assembly is connected to the shell and is arranged together with the shell to form a accommodating space, and the battery cell is located in the accommodating space.

[0028] In a fourth aspect, the present application also provides an electrical device, wherein the electrical device comprises the battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a battery provided in an embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a top cover assembly provided in an embodiment of the present application;

[0032] Figure 4 yes Figure 3 An exploded structural diagram of the top cover assembly shown;

[0033] Figure 5a is along Figure 3 A schematic cross-sectional view of a portion of the structure of the top cover assembly obtained by cutting along the cutting line AA shown;

[0034] Figure 5b is along Figure 5a Enlarged view of middle area B;

[0035] Figure 6a yes Figure 3 A schematic structural diagram of an angle of a top cover of the top cover assembly shown;

[0036] Figure 6b yes Figure 3 A schematic structural diagram of the top cover of the top cover assembly shown in FIG. 1 from another angle;

[0037] Figure 7 is along Figure 3 Another schematic cross-sectional view of a portion of the top cover assembly obtained by cutting along the cutting line AA shown;

[0038] Figure 8 yes Figure 3 A schematic diagram of the exploded structure of the pressure relief valve assembly of the top cover assembly shown;

[0039] Figure 9a yes Figure 8 A schematic structural diagram of a pressure plate of a pressure relief valve assembly at an angle shown;

[0040] Figure 9b yes Figure 8 A schematic structural diagram of the pressure plate of the pressure relief valve assembly shown in FIG.

[0041] Fig.10a yes Figure 8 A schematic structural diagram of an elastic member of a pressure relief valve assembly shown;

[0042] Fig.10b yes Figure 8 Another structural schematic diagram of the elastic member of the pressure relief valve assembly shown;

[0043] Fig.11 It is a schematic diagram of the assembly process of the elastic member and the pressure plate;

[0044] Fig.12a yes Figure 8 A schematic structural diagram of a first sealing member of a pressure relief valve assembly at an angle shown;

[0045] Figure 12b yes Figure 8 A schematic structural diagram of the first sealing member of the pressure relief valve assembly from another angle;

[0046] Fig.13a yes Figure 8 A schematic structural diagram of a second sealing member of the pressure relief valve assembly at an angle shown;

[0047] Fig.13b yes Figure 8 A schematic structural diagram of the second sealing member of the pressure relief valve assembly from another angle;

[0048] Fig.14a yes Figure 3 A schematic structural diagram of the lower plastic of the top cover assembly at an angle shown;

[0049] Fig.14b yes Figure 3 A schematic structural diagram of the lower plastic of the top cover assembly from another angle;

[0050] Fig.14c yes Figure 3 A schematic structural diagram of the lower plastic of the top cover assembly from another angle;

[0051] Fig.15 yes Figure 3 A schematic diagram of the structure of the upper plastic of the top cover assembly shown;

[0052] Fig.16 yes Figure 3 A schematic structural diagram of a pole of a top cover assembly is shown.

[0053] Reference numerals:

[0054] Energy storage system 500, electric energy conversion device 510, first user load 520, second user load 530, electric equipment 400, battery 300, shell 310, battery cell 320, top cover assembly 200, pressure relief valve assembly 100, top cover 210, lower plastic 220, upper plastic 230, pole 240, explosion-proof valve 250, explosion-proof valve protection sheet 260, explosion-proof valve assembly F, pressing plate 10, elastic member 20, first sealing member 30, second sealing member 40, air outlet 11, pressing plate body 12, flange 13, first card slot 14, first sub-portion 131, first sub-portion 132, first sub-portion 133, first sub-portion 134, first sub-portion 135, first sub-portion 136, first sub-portion 137, first sub-portion 138, first sub-portion 139, first sub-portion 140, first sub-portion 141, first sub-portion 142, first sub-portion 143, first sub-portion 144, first sub-portion 145, first sub-portion 146, first sub-portion 147, first sub-portion 148, first sub-portion 149, first sub-portion 149, first sub-portion 147, first sub-portion 148, first sub-portion 149, first sub-portion 141, first sub-portion 142, first sub-portion 143, first sub-portion 144, first sub-portion 145, first sub-portion 146, first sub-portion 147, first sub-portion 148, first sub-portion 149, first sub-portion 149, second sub-portion 132, second mounting groove 15, third mounting groove 16, first connecting portion 21, supporting leg 22, third air channel S3, first sub-air channel S31, second sub-air channel S32, first connecting end 22a, second connecting end 22b, second connecting portion 23, first distance d1, first sealing body 31, retaining wall 32, first surface 311, second surface 312, abutting surface 311a, first air channel S1, second air channel S2, inner ring body 41, outer ring body 42, first thickness T1, second thickness T2, first mounting groove 211, air inlet 212, third edge 213 a, fourth edge 213b, first groove 2111, second groove 2112, first step surface 2113, second step surface 2114, first connecting surface 2115, top cover body 214, second convex portion 215, first surface 2141, second surface 2142, first groove 216a, first through hole 216b, first boss 216c, explosion-proof hole 217, first injection hole 218, exhaust hole 221, fourth installation groove 222, first edge 223a, second edge 223b, second connecting surface 2221, lower plastic body 224, first convex portion 2 25. third surface 2241. fourth surface 2242. baffle 226. support portion 227. second groove 228a. second through hole 228b. second boss 228c. second liquid injection hole 229. first height H1. second height H2. third height H3. fifth surface 231. sixth surface 232. third through hole 233. second card slot 234. first side surface 234a. second side surface 234b. pole body 241. pole base 242. first body 2411. second body 2412. third body 2413. fourth body 2414. DETAILED DESCRIPTION

[0055] For ease of understanding, the terms involved in the embodiments of the present application are first explained.

[0056] And / or: It is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0057] Multiple: refers to two or more than two.

[0058] Connection: should be understood in a broad sense. For example, A and B are connected, which can be either direct or indirect through an intermediary.

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. It should be noted that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] Embodiments of the present application provide a pressure relief valve assembly, a top cover assembly, a battery, and an electrical device.

[0061] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, the current generation of green electricity generally relies on photovoltaics, wind power, water potential, etc., while wind and solar energy generally have problems of strong intermittency and volatility, which will cause instability of the power grid, insufficient electricity during peak hours, too much electricity during low hours, and unstable voltage will also cause damage to electricity. Therefore, it may cause "wind and light abandonment" problems due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage must be relied on. That is, electrical energy is converted into other forms of energy by physical or chemical means and stored, and energy is converted into electrical energy and released when needed. In simple terms, energy storage is similar to a large "power bank". When photovoltaic and wind energy are sufficient, electrical energy is stored and the stored electricity is released when needed.

[0062] Taking electrochemical energy storage as an example, an embodiment of the present application provides an electrical device 400, which has a group of chemical batteries inside. The chemical elements in the chemical batteries are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage media. Simply put, the electricity generated by wind and solar energy is stored in chemical batteries. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0063] At present, energy storage application scenarios are quite extensive, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of electrical equipment 400 include:

[0064] Large-scale energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the power grid, achieve load matching of electricity in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation.

[0065] The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there are large price differences in electricity charges at peak and valley locations according to electricity demand, after users have electrical equipment 400, in order to reduce costs, they usually charge the energy storage cabinet / box during the low electricity price period; during the peak electricity price period, the electricity in the electrical equipment 400 is discharged for use, so as to save electricity bills. In addition, in remote areas, as well as areas prone to natural disasters such as earthquakes and hurricanes, the presence of household electrical equipment 400 is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0066] See also Figure 1 , Figure 1 4 is a schematic diagram of the structure of the energy storage system 500 provided in the embodiment of the present application. The embodiment of the present application takes the household energy storage scenario in the user-side energy storage as an example for explanation, and the electric device 400 of the present application is not limited to the household energy storage scenario.

[0067] The embodiment of the present application provides an energy storage system 500, which includes an electric energy conversion device 510, a first user load 520, a second user load 530, and an electric device 400. The electric device 400 is a small energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the photovoltaic panel can convert solar energy into electric energy during the period of low electricity prices. The electric device 400 is used to store the electric energy and supply it to street lamps and household appliances for use during the peak electricity prices, or to supply power when the power grid is out of power / power outage.

[0068] Among them, the electric device 400 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. When the electric device 400 includes multiple batteries, the multiple batteries are electrically connected and are all located inside the shell of the electric device 400, which can be protected from interference from the external environment under the protection of the shell. Exemplarily, multiple batteries are arranged at intervals. Multiple batteries can be connected in series, or in parallel, or a mixture of series and parallel connections to achieve greater capacity and power. The embodiments of the present application are described by taking the electric device 400 including a battery as an example, but it should be understood that the electric device 400 is not limited to this.

[0069] See also Figure 2 , Figure 2It is a structural schematic diagram of a battery 300 provided in an embodiment of the present application.

[0070] For the convenience of description, the length direction of the battery 300 is defined as the X direction, the width direction of the battery 300 is defined as the Y direction, and the height direction of the battery 300 is defined as the Z direction. The X direction, the Y direction, and the Z direction are perpendicular to each other.

[0071] The battery 300 may include a top cover assembly 200, a shell 310 and a battery cell 320. The top cover assembly 200 is connected to the shell 310 and is surrounded by the shell 310 to form a receiving space, and the battery cell 320 is located in the receiving space. Exemplarily, the top cover assembly 200 may be welded to the shell 310 by welding. The shell 310 may be made of a metal material, such as an aluminum alloy. The battery 300 may be a cylindrical battery 300 or a square battery 300, etc.

[0072] It should be noted that Figure 2 The purpose of the above description is only to schematically describe the connection relationship between the top cover assembly 200, the housing 310 and the battery cell 320, and it does not specifically limit the connection position, specific structure and quantity of each device. The structure shown in the embodiment of the present application does not constitute a specific limitation on the battery 300. In other embodiments of the present application, the battery 300 may include Figure 2 More or fewer components may be shown, or some components may be combined or separated, or the components may be arranged differently. Figure 2 The components shown may be implemented in hardware, software or a combination of software and hardware.

[0073] Please refer to Figure 3 and Figure 4 , Figure 3 is a structural schematic diagram of a top cover assembly 200 provided in an embodiment of the present application, Figure 4 yes Figure 3 A schematic diagram of the exploded structure of the top cover assembly 200 is shown.

[0074] The top cover assembly 200 may include a pressure relief valve assembly 100, a top cover 210, a lower plastic 220, an upper plastic 230, a pole 240, an explosion-proof valve 250, and an explosion-proof valve protection sheet 260. The lower plastic 220 and the upper plastic 230 are sequentially mounted on the top cover 210 along the thickness direction of the top cover assembly 200 (Z direction as shown in the figure). The pole 240 is mounted on the top cover 210 and is insulated from the top cover 210 by the upper plastic 230 and the lower plastic 220. The pole 240 can be used as an electrode lead of the battery 300. The pressure relief valve assembly 100 is connected to the top cover 210 and is spaced apart from the pole 240 in the length direction of the top cover 210 (X direction as shown in the figure). The pressure relief valve assembly 100 is used for pressure relief protection of the battery 300. The explosion-proof valve assembly F is connected to the top cover 210, and is spaced apart from the pressure relief valve assembly 100 and the pole 240 in the length direction of the top cover 210, and is also used for pressure relief protection of the battery 300. The explosion-proof valve assembly F may include an explosion-proof valve 250 and an explosion-proof valve protection sheet 260. The explosion-proof valve 250 and the explosion-proof valve protection sheet 260 are both connected to the explosion-proof hole 217 on the top cover 210, and are sequentially arranged in the thickness direction of the top cover 210. The explosion-proof valve protection sheet 260 covers the explosion-proof valve 250.

[0075] In an embodiment of the present application, the number of poles 240 may be two. The two poles 240 are respectively a positive pole and a negative pole. The two poles 240 are spaced apart in the length direction of the top cover 210. The number of upper plastics 230 may be two. One of the upper plastics 230 is sleeved on the positive pole. The other upper plastic 230 is sleeved on the negative pole. The structure of the top cover assembly 200 will be described below by taking the assembly of a pole 240, an upper plastic 230, a top cover 210 and a lower plastic 220 as an example. In the absence of conflict, the following description of the structure of a pole 240 and an upper plastic 230 can be applied to other poles 240 and upper plastics 230.

[0076] Please refer to Figure 5a , Figure 5b , Figure 6a and Figure 6b , Figure 5a is along Figure 3 A cross-sectional schematic diagram of a partial structure of the top cover assembly 200 obtained by cutting along the cutting line AA shown in FIG. Figure 5b is along Figure 5a The enlarged view of area B in the middle Figure 6a yes Figure 3 The schematic diagram of the structure of the top cover 210 of the top cover assembly 200 is shown at an angle. Figure 6b yes Figure 3 A schematic structural diagram of the top cover 210 of the top cover assembly 200 is shown at another angle.

[0077] The top cover 210 may be provided with a first mounting groove 211 and an air inlet 212. The opening of the first mounting groove 211 is located on the surface of the top cover 210 away from the battery cell 320. The first mounting groove 211 may be formed by being recessed from the surface of the top cover 210 away from the battery cell 320 toward the inside of the top cover 210. The first mounting groove 211 is used to install the pressure relief valve assembly 100. The air inlet 212 penetrates the bottom wall of the first mounting groove 211 along the thickness direction of the top cover 210. The air inlet 212 is coaxially arranged and communicated with the first mounting groove 211. The air inlet 212 may be covered by the pressure relief valve assembly 100. The air inlet 212 may be sealed by the first sealing member 30 when the air pressure at the position thereof is less than a preset threshold value. The air inlet 212 may also be communicated with the air outlet 11 of the pressing plate 10 when the air pressure at the position thereof is greater than or equal to the preset threshold value, so as to allow the gas generated inside the battery cell 320 to pass through.

[0078] The first mounting groove 211 may include a first groove 2111 and a second groove 2112. The first groove 2111 and the second groove 2112 are coaxially arranged and communicated. The opening of the first groove 2111 may be the opening of the first mounting groove 211. The first groove 2111 may be used to accommodate the pressing plate 10 and part of the elastic member 20. The bottom wall of the second groove 2112 may be the bottom wall of the first mounting groove 211. The cross-sectional width of the second groove 2112 along the thickness direction of the top cover 210 may be smaller than the cross-sectional width of the first groove 2111 along the thickness direction of the top cover 210. The second groove 2112 may be used to accommodate the first sealing member 30 and the second sealing member 40 and part of the elastic member 20.

[0079] The connection between the first groove 2111 and the second groove 2112 may form a first step surface 2113 and a second step surface 2114. The first step surface 2113 may be the bottom wall of the first groove 2111. The first step surface 2113 may be arranged in parallel with the bottom wall of the first mounting groove 211, and may be used to abut against the pressing plate 10. The second step surface 2114 may be the inner peripheral wall of the second groove 2112. The inner peripheral wall of the second groove 2112 is the inner surface surrounding the central axis of the second groove 2112. The second step surface 2114 may be arranged perpendicular to the first step surface 2113.

[0080] It is understandable that by forming a step surface in the first mounting groove 211 of the top cover 210 to support the pressure plate 10, the pressure plate 10 abuts against the step surface and is fixed, and when the elastic member 20 is compressed by the pressure of the first sealing member 30, the pressure plate 10 connected to the elastic member 20 can remain stationary, thereby ensuring the connection stability of the pressure relief valve assembly 100. At the same time, the abutment of the pressure plate 10 against the step surface can also enhance the sealing performance of the pressure relief valve assembly 100.

[0081] The top cover 210 may include a third edge 213a and a fourth edge 213b. The third edge 213a and the fourth edge 213b are arranged opposite to each other in the width direction (the Y direction in the figure) of the top cover 210. The distance between the central axis of the first mounting groove 211 and the third edge 213a is equal to the distance between the center line of the first mounting groove 211 and the fourth edge 213b (allowable tolerance range). That is, along the width direction of the top cover 210, the first mounting groove 211 is located in the middle position of the top cover 210 (allowable tolerance range).

[0082] The first mounting groove 211 may include a first connecting surface 2115. The first connecting surface 2115 forms at least a portion of the bottom wall of the first mounting groove 211. The first connecting surface 2115 is connected to the outer edge of the air inlet hole 212 in a surrounding manner and is coaxially arranged with the air inlet hole 212. That is, the first connecting surface 2115 is annular and surrounds the air inlet hole 212. In the thickness direction of the top cover assembly 200 (Z direction as shown in the figure), the distance between the first connecting surface 2115 and the opening of the first mounting groove 211 gradually decreases from the end connected to the air inlet hole 212 to the end away from the air inlet hole 212. That is, the first connecting surface 2115 is an inclined surface.

[0083] It is understandable that, in the process of exhausting the battery 300 through the pressure relief valve assembly 100, the electrolyte in the battery cell 320 may enter the first mounting groove 211 due to the effect of air pressure. Therefore, the bottom wall of the first mounting groove 211 around the air inlet 212 is set as an inclined surface, so that the electrolyte splashed into the first mounting groove 211 can flow into the air inlet 212 through the inclined surface, and then flow back to the battery cell 320, thereby preventing the electrolyte from splashing out of the battery 300 through the pressure relief valve assembly 100.

[0084] In some other embodiments, in the thickness direction of the top cover assembly 200, the distance between the first connecting surface 2115 and the opening of the first mounting groove 211 can first remain unchanged and then gradually decrease from the end connected to the air inlet hole 212 to the end away from the air inlet hole 212.

[0085] In some other embodiments, the first connecting surface 2115 may also form the entire bottom wall of the first mounting groove 211. That is, the first connecting surface 2115 is the bottom wall of the first mounting groove 211. At this time, in the thickness direction of the top cover assembly 200, the distance between the first connecting surface 2115 and the opening of the first mounting groove 211 gradually decreases from the end connected to the air inlet hole 212 to the end away from the air inlet hole 212. Alternatively, in the thickness direction of the top cover assembly 200, the distance between the first connecting surface 2115 and the opening of the first mounting groove 211 may first remain unchanged and then gradually decrease from the end connected to the air inlet hole 212 to the end away from the air inlet hole 212.

[0086] The embodiment of the present application does not limit the proportion of the first connection surface 2115 to the bottom wall of the first installation groove 211 , as long as the electrolyte splashed into the first installation groove 211 can flow back into the battery cell 320 through the inclined surface on the bottom wall of the first installation groove 211 .

[0087] In an embodiment of the present application, the top cover 210 may include a top cover body 214 and a second protrusion 215. The second protrusion 215 is connected to the top cover body 214 and is protruded relative to the top cover body 214 toward the surface of the lower plastic 220. The second protrusion 215 and the top cover body 214 can be connected to form an integrated structure. Exemplarily, the second protrusion 215 and the top cover body 214 can be an integrated structure formed by connecting by means such as integral molding. Alternatively, the second protrusion 215 and the top cover body 214 can also be an integrated structure formed by connecting by assembly methods such as welding and bonding. It should be noted that the integrated structures described below can all be connected by assembly methods such as integral molding, welding, bonding, etc., and will not be repeated.

[0088] Please refer to Figure 5a , Figure 6a , Figure 6b and Figure 7 , Figure 7 is along Figure 3 Another cross-sectional schematic diagram of a partial structure of the top cover assembly 200 obtained by cutting along the cutting line AA shown. The top cover body 214 may include a first surface 2141 and a second surface 2142. The first surface 2141 and the second surface 2142 are arranged opposite to each other in the thickness direction (Z direction shown in the figure) of the top cover body 214. The first surface 2141 is away from the battery cell 320. The second surface 2142 faces the battery cell 320. The second surface 2142 can be connected to the third surface 2241 of the lower plastic 220 and the surface of the pole base 242 of the pole 240 close to the pole body 241. The second protrusion 215 is connected to the second surface 2142 of the top cover body 214 and is located in the fourth mounting groove 222 of the lower plastic 220.

[0089] The top cover body 214 and the second protrusion 215 may be provided with the air inlet 212 and the first mounting groove 211 described above. The air inlet 212 and the first mounting groove 211 are both coaxially arranged with the second protrusion 215. Among them, the air inlet 212 may penetrate the first surface 2141 and the surface of the second protrusion 215 away from the top cover body 214. That is, the first through hole 216b may penetrate the top cover body 214 and the second protrusion 215 along the thickness direction of the top cover 210. The opening of the first mounting groove 211 is located on the first surface 2141. The first mounting groove 211 may be formed by being recessed from the first surface 2141 to the inside of the top cover 210 and the second protrusion 215. Among them, the first groove 2111 is located in the top cover body 214, and the second groove 2112 is located in the second protrusion 215 and part of the top cover body 214. In some other embodiments, the first groove 2111 may be located in the top cover body 214, the second groove 2112 may be located in the second convex portion 215, and the first step surface 2113 may be flush with the second surface 2142. Alternatively, the first groove 2111 may be located in the top cover body 214 and a portion of the second convex portion 215, and the second groove 2112 may be located in the second convex portion 215.

[0090] Please refer to Figure 6a , Figure 6b and Figure 7 , the top cover 210 may be provided with a first groove 216a and a first through hole 216b. The opening of the first groove 216a is located on the surface of the top cover 210 facing the battery cell 320. That is, the opening of the first groove 216a is located on the second surface 2142 of the top cover 210. The first groove 216a may be formed by being recessed from the second surface 2142 to the inside of the top cover 210. The first groove 216a may be used to accommodate the second boss 228c of the lower plastic 220, part of the upper plastic 230 and part of the pole base 242 of the pole 240. The first through hole 216b may penetrate the top cover 210 along the thickness direction of the top cover 210. The first through hole 216b is coaxially arranged and connected with the first groove 216a. The first through hole 216b may be connected with the third through hole 233 of the upper plastic 230 and the second through hole 228b of the lower plastic 220. The first through hole 216b is used for the pole 240 to pass through.

[0091] Among them, the number of the first grooves 216a can be two, and the two first grooves 216a are spaced apart in the length direction of the top cover 210 (X direction in the figure). Each first groove 216a can be used to install a second boss 228c of the lower plastic 220, a part of the upper plastic 230 and a part of the pole base 242 of the pole 240. The number of the first through holes 216b can be two, and the two first through holes 216b can be spaced apart in the length direction of the top cover 210, and are respectively coaxially arranged and connected with the two first grooves 216a. One of the first through holes 216b is used for the positive pole to pass through. The other first through hole 216b is used for the negative pole to pass through.

[0092] In an embodiment of the present application, the top cover 210 may include a first boss 216c. The first boss 216c is connected to the first surface 2141 of the top cover body 214 and is protruding relative to the first surface 2141. The first boss 216c and the top cover body 214 may be connected to form an integrated structure by methods such as integral molding. The first boss 216c is located in the second slot 234 of the upper plastic 230. The surface of the first boss 216c facing away from the top cover body 214 abuts against the first side 234a of the second slot 234 of the upper plastic 230. In some other embodiments, the top cover 210 may also not include the first boss 216c, as long as the top cover 210 can be installed with the second slot 234 of the upper plastic 230.

[0093] For example, the number of the first bosses 216 c may be two, and the two first bosses 216 c are spaced apart in the length direction of the top cover 210 . Each first boss 216 c is connected to a second slot 234 of the upper plastic 230 .

[0094] The top cover body 214 and the first boss 216c may be provided with the first through hole 216b and the first groove 216a described above. Among them, the first through hole 216b may penetrate the second surface 2142 and the surface of the first boss 216c away from the top cover body 214. That is, the first through hole 216b may penetrate the top cover body 214 and the first boss 216c along the thickness direction of the top cover 210. The opening of the first groove 216a is located on the second surface 2142. The first groove 216a may be formed by being recessed from the second surface 2142 to the inside of the top cover 210. The bottom wall of the first groove 216a abuts against the second side 234b of the second slot 234 of the upper plastic 230. The bottom wall of the first groove 216a may be located in the top cover body 214. Alternatively, the bottom wall of the first groove 216a may be located in the first boss 216c. Alternatively, the bottom wall of the first groove 216a may be flush with the first surface 2141. In the embodiment of the present application, there is no limitation on the depth of the first groove 216 a , as long as the distance between the bottom wall of the first groove 216 a and the surface of the first boss 216 c away from the top cover body 214 is equal to the distance between the two inner circumferential surfaces of the second slot 234 of the upper plastic 230 .

[0095] The top cover 210 may also be provided with an explosion-proof hole 217 and a first injection hole 218. Specifically, in the length direction of the top cover body 214 (the X direction shown in the figure), the explosion-proof hole 217 is located between the air inlet hole 212 and the first through hole 216b, and is spaced apart from the air inlet hole 212 and the first through hole 216b. That is, the explosion-proof valve assembly F is spaced apart from the pressure relief valve assembly 100. The explosion-proof hole 217 may penetrate the first surface 2141 and the second surface 2142. That is, the explosion-proof hole 217 penetrates the top cover body 214 along the thickness direction of the top cover body 214. The explosion-proof hole 217 is used to connect with the explosion-proof valve 250 and the explosion-proof valve protection sheet 260.

[0096] In the length direction of the top cover body 214, the first injection hole 218 can be arranged between the explosion-proof hole 217 and the first through hole 216b, and is located at both ends of the explosion-proof hole 217 respectively with the air inlet 212. The first injection hole 218 and the explosion-proof hole 217, the first through hole 216b and the air inlet 212 are all arranged at intervals. The first injection hole 218 can penetrate the first surface 2141 and the second surface 2142. That is, the first injection hole 218 penetrates the top cover body 214 along the thickness direction of the top cover body 214. The first injection hole 218 is used to inject electrolyte into the battery cell 320.

[0097] Please refer to Figure 5a , Figure 5b and Figure 8 , Figure 8 yes Figure 3 Schematic diagram of the exploded structure of the pressure relief valve assembly 100 of the top cover assembly 200 shown. The pressure relief valve assembly 100 is located in the first mounting groove 211 of the top cover 210. The pressure relief valve assembly 100 may include a pressure plate 10, an elastic member 20, a first sealing member 30 and a second sealing member 40 arranged in sequence. The pressure plate 10 is close to the opening of the first mounting groove 211 of the top cover 210. The elastic member 20 elastically abuts between the pressure plate 10 and the first sealing member 30. The second sealing member 40 is connected between the first sealing member 30 and the bottom wall of the first mounting groove 211 of the top cover 210.

[0098] Please refer to Figure 5a , Figure 5b , Figure 9a and Figure 9b , Figure 9a yes Figure 8 The schematic structural diagram of the pressure plate 10 of the pressure relief valve assembly 100 is shown at an angle. Figure 9b yes Figure 8 A schematic structural diagram of the pressure relief valve assembly 100 shown in FIG. 1 is shown in FIG.

[0099] The pressing plate 10 may be provided with an air outlet 11. The air outlet 11 penetrates the pressing plate 10 along the thickness direction (Z direction in the figure) of the pressing plate 10. The air outlet 11 is used to connect the inside of the pressure relief valve assembly 100 with the outside of the pressure relief valve assembly 100 and allow the gas generated in the electric core 320 to pass through.

[0100] Specifically, the pressing plate 10 may include a pressing plate body 12 and a flange 13. The pressing plate body 12 is located in the first groove 2111 of the first mounting groove 211 of the top cover 210. The surface of the pressing plate body 12 facing the elastic member 20 may abut against the first step surface 2113 of the top cover 210, and is spaced apart from the surface of the first sealing member 30 facing the pressing plate 10. The pressing plate body 12 is provided with the air outlet 11 described above. The air outlet 11 penetrates the pressing plate body 12 along the thickness direction of the pressing plate body 12 (Z direction in the figure).

[0101] The flange 13 is located on the side of the pressing plate body 12 facing the elastic member 20. One end of the flange 13 is connected to the outer edge of the air outlet 11. The projection of the other end of the flange 13 along the thickness direction of the pressing plate 10 falls into the pressing plate body 12. That is, the flange 13 is bent relative to the pressing plate body 12. The flange 13 cooperates with the pressing plate body 12 to form a first slot 14. The first slot 14 is used to install part of the elastic member 20.

[0102] The flange 13 may include a first sub-portion 131 and a second sub-portion 132. The first sub-portion 131 is bent and connected between the pressure plate body 12 and the second sub-portion 132. The first sub-portion 131 may be coaxially arranged with the second sub-portion 132, and both may be protruded relative to the surface of the pressure plate body 12 toward the elastic member 20. Specifically, the first sub-portion 131 is arranged around the outer edge of the air outlet 11, and may be arranged substantially perpendicular to the pressure plate body 12. That is, the first sub-portion 131 is annular and surrounds the air outlet 11. The second sub-portion 132 is connected to an end of the first sub-portion 131 away from the air outlet 11, and may be arranged substantially parallel to the pressure plate body 12. The second sub-portion 132 may be annular.

[0103] The first sub-portion 131 and the second sub-portion 132 of the flange 13 cooperate with the platen body 12 to form the first slot 14. The surface of the first sub-portion 131 facing away from the air outlet 11 forms the bottom wall of the first slot 14. The surface of the second sub-portion 132 facing the platen body 12 and the surface of the platen body 12 facing the elastic member 20 cooperate to form two side walls of the first slot 14. The platen body 12 and the first sub-portion 131 and the second sub-portion 132 of the flange 13 can be connected to form an integrated structure by means such as integral molding.

[0104] It can be understood that by providing a flange 13 on the pressing plate 10 and forming a first slot 14 on the pressing plate 10, the elastic member 20 can be snapped into the slot to achieve a fixed connection between the elastic member 20 and the pressing plate 10 and enhance the connection stability between the elastic member 20 and the pressing plate 10.

[0105] The pressing plate 10 may be provided with a second mounting groove 15. Specifically, the second mounting groove 15 is located at the pressing plate body 12. The opening of the second mounting groove 15 is located at the surface of the pressing plate body 12 facing the elastic member 20. The second mounting groove 15 is recessed from the surface of the pressing plate body 12 facing the elastic member 20 toward the inside of the pressing plate body 12. The second mounting groove 15 is coaxially arranged with the air outlet 11 and the flange 13. The second mounting groove 15 is connected to the first card groove 14. Part of the bottom wall of the second mounting groove 15 and the surface of the second sub-portion 132 facing the pressing plate body 12 can cooperate to form the side wall of the first card groove 14. The second mounting groove 15 can be used to install part of the elastic member 20 and accommodate part of the first connecting portion 21 of the elastic member 20. The depth of the second mounting groove 15 can be equal to the height of the first sub-portion 131 along the thickness direction of the pressing plate 10.

[0106] In some other embodiments, the depth of the second mounting groove 15 may be greater than the height of the first sub-portion 131 along the thickness direction of the pressing plate 10 . Alternatively, the depth of the second mounting groove 15 may be less than the height of the first sub-portion 131 along the thickness direction of the pressing plate 10 .

[0107] It is understandable that by providing the second mounting groove 15 on the pressing plate 10, the thickness of the pressing plate 10 can be reduced while ensuring the strength of the pressing plate 10. In addition, since the second mounting groove 15 can also accommodate part of the elastic member 20, during the assembly process of the pressure relief valve assembly 100, the second mounting groove 15 can limit the elastic member 20, so that the pressing plate 10 is bent to form the flange 13, and the process of fixing the flange 13 and the elastic member 20 can be easier and more convenient.

[0108] The pressing plate 10 may also be provided with a third mounting groove 16. The opening of the third mounting groove 16 is located on the surface of the pressing plate body 12 away from the elastic member 20. The third mounting groove 16 is recessed from the surface of the pressing plate body 12 away from the elastic member 20 toward the inside of the pressing plate body 12. The third mounting groove 16 is coaxially arranged with the air outlet 11 and communicated with the air outlet 11. The third mounting groove 16 is used to install the pressing member.

[0109] It is understandable that during the assembly process of the battery 300, after placing a pressure piece with a certain weight on the third mounting groove 16 of the pressure plate 10, the pressure plate 10 can be kept connected to the first step surface 2113 of the top cover 210, so that the threshold value of the pressure relief valve assembly 100 opening the valve can be conveniently set. Exemplarily, when a 0.4kg pressure piece is placed on the third mounting groove 16 of the pressure plate 10 so that the pressure plate 10 is connected to the top cover 210, the preset threshold value of the pressure relief valve assembly 100 opening the valve can be set to 0.2MPa. When the weight of the pressure piece is changed, the valve opening threshold value of the pressure relief valve assembly 100 can be changed accordingly. Among them, the preset threshold value is the air pressure value that causes the pressure relief valve assembly 100 to open the valve.

[0110] Please refer to Figure 5a , Figure 5b and Fig.10a , Fig.10a yes Figure 8 A structural schematic diagram of the elastic member 20 of the pressure relief valve assembly 100 is shown.

[0111] The elastic member 20 is connected between the pressure plate 10 and the first sealing member 30, and is located in the first groove 2111 and the second groove 2112 of the first mounting groove 211 of the top cover 210. The elastic member 20 may include a first connecting portion 21 and a plurality of legs 22. The plurality of legs 22 are arranged at intervals in the circumferential direction of the first connecting portion 21. The circumferential direction of the first connecting portion 21 is a direction that surrounds the central axis of the first connecting portion 21. The plurality of legs 22 and the first connecting portion 21 may be connected to form an integrated structure by methods such as integral molding. The elastic member 20 may be made of a highly elastic material. Exemplarily, the elastic member 20 may be made of a 60Si2Mn material. Each 60Si2Mn molecule is composed of 60 Si atoms and 2 Mn atoms.

[0112] The first connection part 21 may be provided with a second sub-air channel S32. The second sub-air channel S32 penetrates the first connection part 21 along the thickness direction of the first connection part 21 (Z direction shown in the figure), and is connected to the air outlet 11 of the pressing plate 10. The second sub-air channel S32 can be used to allow the gas in the power core 320 to pass through. The first connection part 21 may include an inner edge and an outer edge. Among them, the inner edge of the first connection part 21 is the outer edge of the second sub-air channel S32. The outer edge of the first connection part 21 is away from the second sub-air channel S32. The first connection part 21 abuts against the pressing plate 10 and is located in the first card groove 14 of the pressing plate 10. The inner edge of the first connection part 21 is covered by the pressing plate 10. The thickness of the first connection part 21 along the thickness direction of the elastic member 20 (Z direction shown in the figure) can be equal to the height of the first sub-part 131 along the thickness direction of the pressing plate 10, and can also be equal to the distance between the two side walls of the first card groove 14. Specifically, the surface of the first connection part 21 facing the first seal 30 and the surface facing away from the first seal 30 are respectively in contact with the two side walls of the first card slot 14. The inner peripheral surface of the first connection part 21 is in contact with the bottom wall of the first card slot 14. The inner peripheral surface of the first connection part 21 is the inner surface surrounding the central axis of the first connection part 21, and is also the inner wall of the second sub-airway S32. That is, the elastic member 20 is in contact between the pressure plate body 12 and the flange 13.

[0113] Each leg 22 may include a first connection end 22a and a second connection end 22b. The first connection end 22a of the leg 22 is fixedly connected to the outer edge of the first connection portion 21. The second connection end 22b of the leg 22 abuts against the first surface 311 of the first seal 30 and is spaced apart from the retaining wall 32 of the first seal 30. The second connection end 22b of the leg 22 can move along the radial direction of the first connection portion 21 relative to the first surface 311 of the first seal 30. Specifically, when the elastic member 20 is squeezed by the first seal 30, the second connection end 22b of the leg 22 moves from the central axis of the second connection portion 23 toward the retaining wall 32 of the first seal 30, so that the thickness (i.e., height) of the elastic member 20 along the thickness direction of the top cover assembly 200 is reduced.

[0114] The second connection end 22b of the support leg 22 may be in line contact with the first surface 311 of the first sealing member 30. For example, the second connection end 22b of the support leg 22 is tilted from the first sealing member 30 to the elastic member 20 relative to the first surface 311 of the first sealing member 30. The second connection end 22b of the support leg 22 may be an arc-shaped structure. In addition, the second connection end 22b of the support leg 22 is designed as an arc portion to avoid scratching the first sealing member 30 when the elastic member 20 moves, resulting in damage to the surface of the first sealing member 30 and thus affecting the rebound recovery effect of the elastic member 20.

[0115] It can be understood that by forming a line contact between the second connecting end 22b of the support leg 22 and the first sealing member 30, a line contact can be formed between the elastic member 20 and the first sealing member 30, thereby reducing the difficulty of moving the support leg 22 when the elastic member 20 is subjected to force, and facilitating the second connecting end 22b of the support leg 22 to move along the radial direction of the first connecting portion 21.

[0116] Furthermore, the first connection portion 21 of the elastic member 20 is installed in the first slot 14 of the pressing plate 10, and the second connection end 22b of the support leg 22 can be moved relative to the first sealing member 30. When the elastic member 20 is subjected to the pressure inside the battery 300, the height of the elastic member 20 can be reduced by moving the second connection end 22b of the support leg 22, while the first connection portion 21 of the elastic member 20 connected to the pressing plate 10 is fixed by the first slot 14 and will not move, thereby ensuring the stability of the pressure relief valve assembly 100 during exhaust and pressure relief.

[0117] In the embodiments of this application, please refer to Figure 5a , Figure 5b and Fig.10b , Fig.10b yes Figure 8 Another structural schematic diagram of the elastic member 20 of the pressure relief valve assembly 100 shown in FIG. The elastic member 20 may further include a second connecting portion 23. The second connecting portion 23 may be annular. The inner edge of the second connecting portion 23 is connected to the second connecting end 22b of the support leg 22. The second connecting portion 23 and the first connecting portion 21 are spaced apart in the thickness direction of the elastic member 20 and are located in the second groove 2112 of the first mounting groove 211 of the top cover 210. The second connecting portion 23 abuts against the first surface 311 of the first sealing member 30 and can move in the radial direction of the first connecting portion 21 relative to the first surface 311 of the first sealing member 30. Specifically, when the elastic member 20 is squeezed by the first sealing member 30, the second connecting portion 23 moves from the central axis of the second connecting portion 23 to the direction of the retaining wall 32 of the first sealing member 30. That is, when the elastic member 20 is squeezed by the first sealing member 30, the cross-sectional width of the second connecting portion 23 along the thickness direction of the elastic member 20 gradually increases. This in turn drives the second connection end 22 b of the support leg 22 to move from the central axis of the second connection portion 23 toward the retaining wall 32 of the first sealing member 30 , thereby reducing the thickness (ie, height) of the elastic member 20 along the thickness direction of the top cover assembly 200 .

[0118] There can be a line contact between the second connection part 23 and the first surface 311 of the first seal 30. Exemplarily, the second connection part 23 is tilted from the first seal 30 to the direction of the elastic part 20 relative to the first surface 311 of the first seal 30. By forming a line contact between the second connection part 23 and the first seal 30, the difficulty of the second connection part 23 moving when the elastic part 20 is subjected to force can be reduced, and the second connection part 23 can be convenient for moving along the radial direction of the first connection part 21. The end of the second connection part 23 away from the second connection end 22b of the support leg 22 can be an arc structure. Designing the second connection part 23 as an arc portion can avoid scratching the first seal 30 when the elastic part 20 moves, resulting in damage to the surface of the first seal 30 and thus affecting the rebound recovery effect of the elastic part 20.

[0119] It can be understood that by providing the second connecting portion 23, the second connecting ends 22b of the multiple legs 22 can be connected together, so that when the elastic member 20 is subjected to the pressure in the battery cell 320, the force is more evenly applied when the second connecting portion 23 moves relative to the first sealing member 30, thereby making the pressure relief process of the pressure relief valve assembly 100 more stable.

[0120] In an embodiment of the present application, the elastic member 20 may be provided with a third air channel S3. The third air channel S3 may include a first sub-air channel S31 and the second sub-air channel S32 described above. Among them, the first sub-air channel S31 is composed of a gap area between a plurality of adjacent legs 22. The first sub-air channel S31 is connected to the second sub-air channel S32 through the space area formed by the first connecting portion 21 and the second connecting portion 23 and the plurality of legs 22. The third air channel S3 is used to allow the gas generated in the power core 320 to pass through.

[0121] It can be understood that by setting the third air channel S3 in the elastic member 20, and making the first sub-air channel S31 in the third air channel S3 connected with the first air channel S1 between the first sealing member 30 and the second step surface 2114 of the top cover 210, and the second sub-air channel S32 in the third air channel S3 connected with the air outlet 11 of the pressure plate 10, the third air channel S3 can be connected between the second air channel S2 and the air outlet 11, so that when the pressure relief valve assembly 100 is venting, the gas generated by the battery cell 320 can be normally discharged to the outside of the pressure relief valve assembly 100.

[0122] See also Fig.11 , Fig.11 is a schematic diagram of the assembly process of the elastic member 20 and the pressing plate 10. In the embodiment of the present application, the assembly process of the elastic member 20 and the pressing plate 10 may include at least the following steps:

[0123] First, the second mounting groove 15 is formed on the surface of the pressing plate 10 facing the battery cell 320 .

[0124] Secondly, the first bending process is performed on the area of ​​the pressing plate 10 around the central axis of the pressing plate 10, and this part of the pressing plate 10 area is bent to be perpendicular to the original pressing plate 10 (i.e., the pressing plate body 12). The bent pressing plate 10 forms a flange 13, and the flange 13 extends from the pressing plate 10 toward the direction of the battery cell 320. At this time, the original area of ​​the flange 13 on the pressing plate 10 forms an air outlet 11.

[0125] Then, the elastic member 20 is mounted on the pressing plate 10, so that the surface of the first connection portion 21 of the elastic member 20 facing away from the battery cell 320 abuts against the bottom wall of the second mounting groove 15 of the pressing plate 10, and the inner edge of the first connection portion 21 is connected to the outer peripheral surface of part of the flange 13. The outer peripheral surface of the flange 13 is the outer surface surrounding the central axis of the flange 13.

[0126] Afterwards, the portion of the flange 13 that is not connected to the first connection portion 21 is bent for the second time, so that the first connection portion 21 is fixed by the flange 13 and the pressure plate body 12. The specific bending process is: after bending this portion of the flange 13 45° in the direction away from the central axis of the pressure plate 10, it is riveted to make this portion of the flange 13 parallel to the pressure plate body 12. This portion of the flange 13 is the second sub-portion 132 of the flange 13, and the flange 13 that has only been bent for the first time is the first sub-portion 131 of the flange 13. The first sub-portion 131, the second sub-portion 132 and the bottom wall of the second mounting groove 15 together form the first clamping groove 14.

[0127] Please refer to Figure 5a , Figure 5b , Fig.12a and Figure 12b , Fig.12a yes Figure 8 The schematic diagram of the structure of the first sealing member 30 of the pressure relief valve assembly 100 is shown at an angle. Figure 12b yes Figure 8 The schematic structural diagram of the first sealing member 30 of the pressure relief valve assembly 100 is shown in another angle.

[0128] The first sealing member 30 is located in the second groove 2112 of the first mounting groove 211 of the top cover 210. There is a gap between the outer peripheral surface of the first sealing member 30 and the inner peripheral wall of the second groove 2112 for allowing the gas in the power core 320 to pass through. The outer peripheral surface of the first sealing member 30 is an outer surface surrounding the central axis of the first sealing member 30.

[0129] The first sealing member 30 may include a first sealing body 31 and a retaining wall 32. The retaining wall 32 is connected to the outer edge of the first sealing body 31 and is protruded from the first sealing member 30 toward the elastic member 20 relative to the first sealing body 31. That is, the retaining wall 32 is annular and surrounds the first sealing body 31. The retaining wall 32 and the first sealing body 31 may be an integrated structure formed by a method such as integral molding.

[0130] The first sealing body 31 may include a first surface 311 and a second surface 312. The first surface 311 and the second surface 312 are arranged opposite to each other in the thickness direction (Z direction in the figure) of the first sealing body 31. The first surface 311 faces away from the battery cell 320. The first surface 311 may abut against the elastic member 20. The second surface 312 faces toward the battery cell 320. The second surface 312 may abut against the second sealing member 40.

[0131] The portion of the first surface 311 that contacts the elastic member 20 may be a plane. Specifically, the first surface 311 may include an abutting surface 311a that abuts against the elastic member 20. That is, the abutting surface 311a forms at least a portion of the first surface 311 and extends along the circumferential direction of the first sealing body 31. The circumferential direction of the first sealing body 31 is a direction that surrounds the central axis of the first sealing body 31. The abutting surface 311a is arranged parallel to the bottom wall of the first mounting groove 211 of the top cover 210.

[0132] It is understandable that by arranging the abutting surface 311a of the first sealing member 30 in parallel with the bottom wall of the first mounting groove 211 of the top cover 210, the contact position between the elastic member 20 and the first sealing member 30 can be kept flat, so that the pressure relief valve assembly 100 maintains structural stability during the pressure relief process. The smaller the area of ​​the abutting surface 311a, the better its flatness can be guaranteed.

[0133] In a possible application scenario, the distance between the first surface 311 and the opening of the first installation groove 211 of the top cover 210 first remains constant, then gradually increases, and then remains constant in the direction from the central axis of the first sealing body 31 to the retaining wall 32. That is, the central area of ​​the first surface 311 close to the central axis of the first sealing body 31 is raised relative to the edge area of ​​the first surface 311 far from the central axis of the first sealing body 31 (that is, the area where the abutting surface 311a is located).

[0134] In other application scenarios, the central area of ​​the first surface 311 close to the central axis of the first sealing body 31 can also be recessed relative to the edge area of ​​the first surface 311 away from the central axis of the first sealing body 31 (i.e., the area where the abutment surface 311a is located), so that the contact position between the elastic member 20 and the first sealing member 30 can remain flat.

[0135] In the embodiment of the present application, the second surface 312 can be arranged parallel to the first surface 311, and the distance between the second surface 312 and the first surface 311 remains unchanged. That is, the second surface 312 has a structure corresponding to the first surface 311. In some other embodiments, the structural relationship between the second surface 312 and the first surface 311 may not be limited.

[0136] The retaining wall 32 is connected to the first sealing body 31 and is protruded relative to the first surface 311 of the first sealing body 31. The retaining wall 32 can be vertically arranged with respect to the first sealing body 31. In some other embodiments, the retaining wall 32 can also be inclined with respect to the first sealing body 31. The retaining wall 32 can surround a portion of the elastic member 20, and can be enclosed with the first sealing body 31 to form a receiving space for receiving the elastic member 20.

[0137] It can be understood that by setting a retaining wall 32 in the first seal 30, the retaining wall 32 can be used as a stop position in the first seal 30 to limit the moving distance of the elastic member 20 relative to the first seal 30, thereby preventing the elastic member 20 from slipping off the first seal 30 and having a good limiting effect.

[0138] The retaining wall 32 is spaced apart from the side wall of the first mounting groove 211 of the top cover 210. That is, the retaining wall 32 is spaced apart from the second step surface 2114 of the top cover 210. The gap area between the outer peripheral surface of the retaining wall 32 and the second step surface 2114 of the top cover 210 forms the first air channel S1. The outer peripheral surface of the retaining wall 32 is the outer surface surrounding the central axis of the retaining wall 32. The first air channel S1 is connected to the first sub-air channel S31 of the elastic member 20, and is used to allow the gas in the power core 320 to pass through.

[0139] The end of the retaining wall 32 away from the first sealing body 31 is spaced apart from the pressing plate 10. In the thickness direction of the top cover assembly 200, the distance between the end of the retaining wall 32 away from the first sealing body 31 and the surface of the pressing plate 10 facing the elastic member 20 is a first distance d1. The size of the first distance d1 can be used to limit the degree to which the elastic member 20 is compressed.

[0140] It is understandable that when the first sealing member 30 is pushed upward by the air pressure in the battery cell 320 and compresses the elastic member 20, the end of the retaining wall 32 away from the first sealing body 31 will be close to the surface of the pressure plate 10 facing the elastic member 20, and the first distance d1 will be reduced. Therefore, if the first distance d1 is set too large, the distance that the retaining wall 32 can float will be greater, the distance that the first sealing body 31 can float will also be greater, and the degree of compression of the elastic member 20 will be greater. However, if the elastic member 20 is compressed too much, the elastic member 20 will be plastically deformed and difficult to recover to the original state. Therefore, in the embodiment of the present application, the first distance d1 is set within the range of 0.1mm to 0.5mm (including the endpoint values ​​0.1mm and 0.5mm). The first distance d1 within this range can not only ensure the normal exhaust function of the pressure relief valve assembly 100, but also avoid the situation where the elastic member 20 is compressed too much and plastically deformed and difficult to recover to the original state due to the first distance d1 being too large, and the reliability is good.

[0141] The gap area between the first sealing member 30 and the pressing plate 10 forms a second air channel S2. The second air channel S2 includes the gap area between the end of the retaining wall 32 away from the first sealing body 31 and the pressing plate 10, and the accommodating space formed by the retaining plate 226 and the first sealing body 31. The second air channel S2 is connected to the first sub-air channel S31 of the elastic member 20, and is used to allow the gas in the power core 320 to pass through.

[0142] Please refer to Figure 5a , Figure 5b , Fig.13a and Fig.13b , Fig.13a yes Figure 8 The schematic diagram of the structure of the second sealing member 40 of the pressure relief valve assembly 100 is shown at an angle. Fig.13b yes Figure 8 FIG. 1 is a schematic structural diagram of the second sealing member 40 of the pressure relief valve assembly 100 from another angle.

[0143] The second seal 40 is located between the first seal 30 and the bottom wall of the first mounting groove 211 of the top cover 210. Specifically, the second seal 40 is located in the second groove 2112 of the first mounting groove 211 of the top cover 210 and abuts against the bottom wall of the second groove 2112. That is, the second seal 40 abuts against the bottom wall of the first mounting groove 211 of the top cover 210. The side of the second seal 40 that is away from the bottom wall of the first mounting groove 211 of the top cover 210 abuts against the second surface 312 of the first seal 30. There is a gap between the second seal 40 and the inner peripheral wall of the second groove 2112. That is, there is a gap between the second seal 40 and the inner peripheral wall of the first mounting groove 211 (i.e., the second step surface 2114). The distance between the outer peripheral surface of the second seal 40 and the second step surface 2114 of the top cover 210 can be in the range of 0 to 0.17 mm (including the endpoint value 0.17 mm, but excluding the endpoint value 0 mm). The outer peripheral surface of the second sealing member 40 is an outer surface surrounding the central axis of the second sealing member 40 .

[0144] It is understandable that by setting the distance between the outer circumferential surface of the second sealing member 40 and the second step surface 2114 of the top cover 210 within the aforementioned range, the second sealing member 40 can be more easily installed in the first installation groove 211 of the top cover 210. It is prevented that the gap is too small, which may cause the second sealing member 40 to be assembled poorly, twist and deform, and cause the sealing failure of the pressure relief valve assembly 100. At the same time, it is also prevented that the gap is too large and air leakage occurs.

[0145] The second sealing member 40 is also located at the outer edge of the air inlet hole 212 of the top cover 210. Specifically, the second sealing member 40 is disposed around the circumferential direction of the air inlet hole 212 of the top cover 210. The circumferential direction of the air inlet hole 212 is a direction that surrounds the central axis of the air inlet hole 212. That is, the second sealing member 40 is annular and surrounds the air inlet hole 212.

[0146] The second sealing member 40 may be made of a sealing material having low temperature resistance. For example, the second sealing member 40 may be made of EPDM (Ethylene Propylene Diene Monomer).

[0147] The second seal 40 may include an inner ring body 41 and an outer ring body 42. The inner ring body 41 abuts between the first seal 30 and the bottom wall of the first mounting groove 211 of the top cover 210. The inner ring body 41 is in line contact with the first seal 30. And / or, the inner ring body 41 is in line contact with the first mounting groove 211. The outer ring body 42 is connected to the outer edge of the inner ring body 41 in a circumferential manner. In the thickness direction of the second seal 40 (Z direction in the figure), the thickness of the outer ring body 42 is less than the thickness of the inner ring body 41. The outer ring body 42 is also located between the first seal 30 and the bottom wall of the first mounting groove 211 of the top cover 210, and is spaced apart from the first seal 30 and the bottom wall of the first mounting groove 211 of the top cover 210.

[0148] It can be understood that by making the thickness of the outer ring body 42 smaller than the thickness of the inner ring body 41, a gap can be provided between the outer ring body 42 and the first seal 30, and between the outer ring body 42 and the bottom wall of the first mounting groove 211 of the top cover 210. This gap can serve as a channel for the gas in the battery cell 320 to be discharged to the outside of the battery 300, making the gas flow smoother.

[0149] Specifically, the thickness of the second seal 40 increases first, then decreases, and finally remains unchanged from the direction close to the central axis of the second seal 40 to the direction away from the central axis of the second seal 40. Therefore, there is a maximum thickness in the inner ring body 41, that is, the first thickness T1. At the maximum thickness of the inner ring body 41, the second seal 40 contacts the first seal 30 and / or the bottom wall of the first mounting groove 211 of the top cover 210. That is, the second seal 40 is in line contact with the first seal 30, and / or the second seal 40 is in line contact with the bottom wall of the first mounting groove 211. Therefore, at other parts of the inner ring body 41 and at the outer ring body 42, there is a gap between the second seal 40 and the first seal 30 and the bottom wall of the first mounting groove 211 of the top cover 210, and this gap can be used as a channel for the gas in the battery cell 320 to be discharged to the outside of the battery 300.

[0150] In some other embodiments, the thickness of the second seal 40 first decreases and then remains unchanged from the direction close to the central axis of the second seal 40 to the direction away from the central axis of the second seal 40. This can also make the second seal 40 and the first seal 30 in line contact, and / or the second seal 40 and the bottom wall of the first installation groove 211 in line contact.

[0151] It is understandable that if the second seal 40 forms surface contact with the top cover 210 and / or the first seal 30, the second seal 40 may be partially concave due to insufficient flatness, thereby affecting the sealing effect of the pressure relief valve assembly 100 after assembly. Therefore, by making the second seal 40 form line contact with the top cover 210 and / or the first seal 30, the sealing effect of the pressure relief valve assembly 100 can be improved.

[0152] In a possible application scenario, the cross-sectional shape of the inner ring body 41 of the second seal 40 along the radial direction of the second seal 40 is circular, and the maximum thickness of the second seal 40 is equal to the diameter of the circle. The cross-sectional shape of the outer ring body 42 of the second seal 40 along the radial direction of the second seal 40 is rectangular, which can prevent the second seal 40 from moving in its radial direction and improve the structural stability of the second seal 40 after assembly.

[0153] In the embodiment of the present application, the portion of the second sealing member 40 whose thickness remains unchanged is the outer ring body 42. The thickness of the outer ring body 42 is the second thickness T2. The second thickness T2 is greater than or equal to 0.4 mm.

[0154] It can be understood that by setting the thickness of the outer ring body 42 within the aforementioned range, it is possible to avoid the outer ring body 42 being too thin and deformed, resulting in the outer ring body 42 being unable to provide sufficient supporting force when under pressure, thereby causing the relative position of the first seal 30 and the top cover 210 to be unstable, and the outer ring body 42 being unable to play a positioning and guiding role.

[0155] In the embodiment of the present application, the difference between the first thickness T1 and the second thickness T2 of the second sealing member 40 accounts for a ratio of the first thickness T1 that is greater than or equal to 30%, that is, (T1-T2) / T1≥30%.

[0156] It is understandable that by making the thickness of the second sealing member 40 meet the above conditions, the thickness difference of the second sealing member 40 can be kept within an appropriate range. It is avoided that the thickness difference of the second sealing member 40 is too small, resulting in the outer ring body 42 contacting the top cover 210 and the first sealing member 30 when it is compressed, resulting in an unstable sealing interface and sealing failure.

[0157] During the use of the battery, chemical reactions inside the battery cell will produce a large amount of gas. Once the gas accumulates too much, it is easy to cause the battery to explode. Therefore, an explosion-proof valve assembly is generally provided in the top cover assembly. When the gas pressure inside the battery cell reaches a certain value, the gas will break through the explosion-proof valve assembly and be discharged to the outside of the battery, thereby preventing the battery from exploding due to excessive gas pressure inside. However, once the explosion-proof valve explodes, it cannot be used again, and the explosion of the explosion-proof valve will also greatly reduce the life of the battery cell.

[0158] Therefore, in the embodiment of the present application, by providing the pressure relief valve assembly 100 in the top cover assembly 200, the battery 300 can be repeatedly vented, and the impact on the battery cell 320 during the venting process can be reduced. Figure 5b As shown by the dotted arrow, when a certain amount of gas is generated inside the battery cell 320, causing the gas pressure formed by the gas entering the air inlet 212 of the top cover 210 to be greater than or equal to the preset threshold of the pressure relief valve assembly 100, the gas will pass through the air inlet 212 of the top cover 210 and the through hole on the second seal 40 in sequence, and then lift up the first seal 30, so that the first seal 30 compresses the elastic member 20. The second connection part 23 of the elastic member 20 will move in the radial direction of the first connection part 21 under the pressure of the first seal 30, thereby reducing the height of the elastic member 20. As the first seal 30 compresses the elastic member 20, the first seal 30 is separated from the second seal 40. The gas will enter the first air passage S1 between the first seal 30 and the second step surface 2114 of the top cover 210 through the gap between the second seal 40 and the first seal 30. It then enters the second air channel S2 between the retaining wall 32 of the second seal 40 and the pressure plate 10 through the first air channel S1, and then diffuses to the first sub-air channel S31 between the multiple legs 22 of the elastic member 20, and then passes through the second air channel S2 between the first sealing body 31 of the first seal 30 and the pressure plate 10, the second sub-air channel S32 of the first connecting part 21 of the elastic member 20, and the air outlet 11 of the pressure plate 10 in sequence, and is finally discharged to the outside of the battery 300.

[0159] Or, if Figure 5b As shown by the solid arrow, Figure 5b Different from the path indicated by the dotted arrow, when the gas passes through the second sealing member 40, it can also enter the gap between the second sealing member 40 and the second step surface 2114 of the top cover 210 through the gap between the second sealing member 40 and the bottom wall of the first mounting groove 211, and then enter the first air passage S1 between the first sealing member 30 and the second step surface 2114 of the top cover 210.

[0160] When the air pressure at the air inlet 212 is less than the preset threshold of the pressure relief valve assembly 100, the rebound force of the elastic member 20 causes the first sealing member 30 to be pressed against the second sealing member 40, so that the pressure relief valve assembly 100 remains sealed, and the pressure relief valve assembly 100 stops exhausting, and the one-way exhaust of the pressure relief valve assembly 100 is realized in a reciprocating cycle. Exemplarily, the preset threshold may be 0.2 MPa. Of course, in some other embodiments, the preset threshold may also be other values, which are not strictly limited.

[0161] In summary, when the gas generated inside the battery cell 320 causes the air pressure entering the air inlet 212 of the top cover 210 to be greater than or equal to the preset threshold of the pressure relief valve assembly 100, the pressure relief valve assembly 100 will start to exhaust the battery 300. When the air pressure at the air inlet 212 of the top cover 210 is less than the preset threshold of the pressure relief valve assembly 100, the pressure relief valve assembly 100 will stop exhausting. That is, the pressure relief valve assembly 100 can repeatedly exhaust the battery 300. The service life of the battery cell 320 is greatly improved.

[0162] Moreover, due to the pressure difference between the inside and outside of the pressure relief valve assembly 100, the pressure relief valve can only be opened by the air pressure in the battery cell 320, and cannot be opened from the outside of the battery. That is, the pressure relief valve assembly 100 is one-way. This can prevent water molecules and other substances outside the battery 300 from entering the battery 300 through the pressure relief valve assembly 100 and causing the battery 300 to fail, and further improve the reliability of the battery 300 and increase its service life.

[0163] In addition, although the explosion-proof valve assembly F can play a role when a large amount of gas is generated inside the battery 300, resulting in a high gas pressure, when the gas generated inside the battery cell 320 is small and insufficient to reach the threshold of breaking through the explosion-proof valve 250, these gases cannot be discharged. However, although these small amounts of gas will not cause the battery 300 to explode, they will cause the battery 300 to bulge, deform, etc. The pressure relief valve assembly 100 can control the amount of gas in the battery cell 320 discharged from the battery 300 by adjusting the threshold of the pressure relief valve assembly 100 to open the valve, thereby achieving the purpose of discharging a small amount of gas generated inside the battery 300.

[0164] Please refer to Figure 5a , Figure 5b , Figure 7 and Fig.14a , Fig.14a yes Figure 3 A schematic structural diagram of an angle of the lower plastic 220 of the top cover assembly 200 shown. The lower plastic 220 is connected to the second surface 2142 of the top cover 210. Part of the lower plastic 220 is located between the upper plastic 230 and the pole base 242 of the pole 240. The lower plastic 220 may be provided with an exhaust hole 221. The exhaust hole 221 penetrates the lower plastic 220 along the thickness direction of the lower plastic 220. The exhaust hole 221 is staggeredly connected to the air inlet 212 of the top cover 210, and is used to allow the gas and electrolyte in the battery cell 320 to pass through. That is, the gas in the battery cell 320 can enter the air inlet 212 of the top cover 210 through the exhaust hole 221.

[0165] The number of the exhaust holes 221 may be one or more. When the number of the exhaust holes 221 is multiple, the multiple exhaust holes 221 may be arranged on the lower plastic 220 at intervals along the circumferential direction of the second protrusion 215 of the top cover 210. The circumferential direction of the second protrusion 215 is a direction around the central axis of the second protrusion 215. Each exhaust hole 221 is staggered and connected to the air inlet 212.

[0166] It is understandable that during the process of using the pressure relief valve assembly 100 to vent gas, due to the effect of the air pressure in the battery cell 320 , the electrolyte is easily splashed into the interior of the pressure relief valve assembly 100 , and even splashed or overflowed through the pressure relief valve assembly 100 to the outside of the battery 300 .

[0167] Therefore, in the embodiment of the present application, when the electrolyte enters the first mounting groove 211 of the top cover 210, the electrolyte can flow into the air inlet 212 of the top cover 210 through the inclined surface on the bottom wall of the first mounting groove 211. Then, the electrolyte flows into the surface of the lower plastic 220 close to the top cover 210 through the air inlet 212 of the top cover 210, and then flows into the exhaust hole 221 of the lower plastic 220, and finally flows back to the battery cell 320 through the exhaust hole 221 of the lower plastic 220. The purpose of returning the electrolyte entering the pressure relief valve assembly 100 into the battery cell 320 is achieved, and the electrolyte is prevented from splashing or overflowing to the outside of the battery 300 through the pressure relief valve assembly 100. Furthermore, the staggered connection between the exhaust hole 221 and the air inlet hole 212 can increase the path for the electrolyte of the battery cell 320 to enter the first mounting groove 211 of the top cover 210, thereby reducing the possibility that the electrolyte enters the exhaust hole 221 of the lower plastic 220 and then directly splashes into the air inlet hole 212 of the top cover 210 and thus enters the first mounting groove 211 of the top cover 210, thereby increasing the difficulty of the electrolyte penetrating into the interior of the pressure relief valve assembly 100.

[0168] In some other embodiments, the exhaust hole 221 may also be coaxially arranged with the air inlet hole 212 of the top cover 210 and communicate with each other.

[0169] Please refer to Figure 7 , Fig.14a and Fig.14b , Fig.14b yes Figure 3The schematic diagram of the structure of the lower plastic 220 of the top cover assembly 200 shown in another angle. The lower plastic 220 may be provided with a fourth mounting groove 222. The opening of the fourth mounting groove 222 is located on the surface of the lower plastic 220 close to the top cover 210. The fourth mounting groove 222 may be formed by being recessed from the surface of the lower plastic 220 close to the top cover 210 to the inside of the lower plastic 220. The fourth mounting groove 222 is coaxially arranged and connected with the air inlet 212 of the top cover 210, and is coaxially arranged with the first mounting groove 211 of the top cover 210. The fourth mounting groove 222 may be used to accommodate the second protrusion 215 of the top cover 210. And there is a gap between the inner wall of the fourth mounting groove 222 and the second protrusion 215 of the top cover 210. Among them, the inner wall of the fourth mounting groove 222 includes the bottom wall and the inner peripheral wall of the fourth mounting groove 222. The inner peripheral wall of the fourth mounting groove 222 is the inner surface surrounding the central axis of the fourth mounting groove 222. Specifically, there is a gap between the bottom wall of the fourth mounting groove 222 and the surface of the first protrusion 225 of the lower plastic 220 that faces away from the top cover body 214. There is a gap between the inner peripheral wall of the fourth mounting groove 222 and the outer peripheral surface of the first protrusion 225 of the lower plastic 220. The outer peripheral surface of the first protrusion 225 of the lower plastic 220 is an outer surface that surrounds the central axis of the first protrusion 225. These gap areas cooperate to form a flow channel for electrolyte to pass through.

[0170] The lower plastic 220 may include a first edge 223a and a second edge 223b. The first edge 223a and the second edge 223b are arranged opposite to each other in the width direction (the Y direction in the figure) of the lower plastic 220. The distance between the central axis of the fourth mounting groove 222 and the first edge 223a is equal to the distance between the central axis of the fourth mounting groove 222 and the second edge 223b (allowable tolerance range). That is, along the width direction of the lower plastic 220, the fourth mounting groove 222 is located in the middle position of the lower plastic 220 (allowable tolerance range).

[0171] It is understandable that during the charge and discharge process of the battery, the surface of the battery's pole pieces (such as the anode and cathode) may lack electrolyte in some areas due to uneven flow of electrolyte, forming dry areas. Compared with the outer ring of the battery cell, it is relatively difficult for the pole pieces in the inner ring of the battery cell to be re-wetted by the electrolyte outside the battery cell.

[0172] Therefore, in the embodiment of the present application, the first mounting groove 211 of the top cover 210 is set at the middle position in the width direction of the top cover 210, and the fourth mounting groove 222 of the lower plastic 220 is set at the middle position in the width direction of the lower plastic 220, so that the exhaust hole 221 corresponds to the middle inner circle position of the battery cell 320, so that the electrolyte collected and refluxed from the top cover 210 and the lower plastic 220 is redistributed to the middle inner circle position of the battery cell 320, thereby improving the re-infiltration effect of the electrode at the middle inner circle position of the battery cell 320.

[0173] The outer edge of the bottom wall of the fourth mounting groove 222 may be provided with the exhaust hole 221 described above. The exhaust hole 221 is connected to the fourth mounting groove 222. That is, part of the outer edge of the exhaust hole 221 is connected to part of the outer edge of the bottom wall of the fourth mounting groove 222. The exhaust hole 221 and the air inlet 212 of the top cover 210 are staggeredly connected through the flow channel formed by the gap between the fourth mounting groove 222 and the second protrusion 215 of the top cover 210. When the number of the exhaust holes 221 is multiple, the multiple exhaust holes 221 can be spaced apart along the circumferential direction of the fourth mounting groove 222. The circumferential direction of the fourth mounting groove 222 is the direction of a circle around the central axis of the fourth mounting groove 222.

[0174] In some other embodiments, the outer edge of the exhaust hole 221 may be connected to the inner edge of the bottom wall of the fourth mounting groove 222. That is, the exhaust hole 221 penetrates the bottom wall of the fourth mounting groove 222 along the thickness direction of the lower plastic 220. The central axis of the exhaust hole 221 is spaced from the central axis of the fourth mounting groove 222, so that the exhaust hole 221 and the air inlet 212 of the top cover 210 can be staggered and connected.

[0175] It can be understood that, by setting the exhaust hole 221 of the lower plastic 220 at the outer edge of the bottom wall of the fourth mounting groove 222, and setting the air inlet 212 of the top cover 210 coaxially with the first mounting groove 211, the staggered setting of the exhaust hole 221 of the lower plastic 220 and the air inlet 212 of the top cover 210 is achieved. And the flow channel between the fourth mounting groove 222 of the lower plastic 220 and the second protrusion 215 of the top cover 210 realizes the communication between the exhaust hole 221 of the lower plastic 220 and the air inlet 212 of the top cover 210. This staggered connection setting can ensure that the gas generated by the battery cell 320 can be smoothly discharged to the outside of the battery 300, while increasing the path for the electrolyte of the battery cell 320 to enter the first mounting groove 211 of the top cover 210, reducing the possibility of the electrolyte entering the inside of the pressure relief valve assembly 100. In addition, the gap between the fourth mounting groove 222 of the lower plastic 220 and the second protrusion 215 of the top cover 210 can be used as a buffer space or a liquid storage space, so that the electrolyte splashed into the fourth mounting groove 222 of the lower plastic 220 needs to accumulate a certain amount before it can enter the first mounting groove 211 of the top cover 210 through the air inlet 212 of the top cover 210, further increasing the difficulty of the electrolyte penetrating into the interior of the pressure relief valve assembly 100.

[0176] The fourth mounting groove 222 may further include a second connection surface 2221. The second connection surface 2221 forms at least a portion of the bottom wall of the fourth mounting groove 222. The second connection surface 2221 is located between the exhaust hole 221 and the air inlet 212 of the top cover 210. In the thickness direction of the top cover assembly 200, the distance between the second connection surface 2221 and the opening of the fourth mounting groove 222 gradually decreases from the end facing the exhaust hole 221 to the end away from the exhaust hole 221. That is, the second connection surface 2221 is an inclined surface.

[0177] In some other embodiments, in the thickness direction of the top cover assembly 200, the distance between the second connecting surface 2221 and the opening of the fourth mounting groove 222 can first remain unchanged and then gradually decrease from the end toward the end away from the exhaust hole 221.

[0178] In some other embodiments, the second connection surface 2221 may form the entire bottom wall of the fourth mounting groove 222. That is, the second connection surface 2221 is the bottom wall of the fourth mounting groove 222. At this time, in the thickness direction of the top cover assembly 200, the distance between the second connection surface 2221 and the opening of the fourth mounting groove 222 gradually decreases from the end facing the exhaust hole 221 to the end away from the exhaust hole 221. Alternatively, in the thickness direction of the top cover assembly 200, the distance between the second connection surface 2221 and the opening of the fourth mounting groove 222 may first remain unchanged and then gradually decrease from the end facing the exhaust hole 221 to the end away from the exhaust hole 221.

[0179] The embodiment of the present application does not limit the ratio of the second connection surface 2221 to the fourth installation groove 222 , as long as the electrolyte splashed into the fourth installation groove 222 can flow into the battery cell 320 through the inclined surface on the bottom wall of the fourth installation groove 222 .

[0180] It is understandable that when the electrolyte enters the first mounting groove 211 of the top cover 210, the electrolyte can flow into the air inlet 212 of the top cover 210 through the inclined surface on the bottom wall of the first mounting groove 211. Then, it flows into the fourth mounting groove 222 of the lower plastic 220 through the air inlet 212 of the top cover 210, and then flows into the exhaust hole 221 of the lower plastic 220 through the inclined surface on the bottom wall of the fourth mounting groove 222, and finally flows back to the battery cell 320. The bottom wall of the first mounting groove 211 of the top cover 210 and the bottom wall of the fourth mounting groove 222 of the lower plastic 220 are both provided with inclined surfaces, so that the electrolyte splashed into the first mounting groove 211 of the top cover 210 and the fourth mounting groove 222 of the lower plastic 220 can flow back to the battery cell 320 more easily, and also make the electrolyte flow faster, saving time.

[0181] For a possible application scenario, please refer to Figure 7 and Fig.14b , the exhaust hole 221 is located at the outer edge of the bottom wall of the fourth mounting groove 222 and is connected to the fourth mounting groove 222. The number of the exhaust holes 221 can be four. The four exhaust holes 221 can be arranged at intervals along the circumferential direction of the fourth mounting groove 222. The four exhaust holes 221 can be located at the four equal points of the circumferential direction of the fourth mounting groove 222. The second connecting surface 2221 forms part of the bottom wall of the fourth mounting groove 222. The second connecting surface 2221 is annular. The outer edge of the second connecting surface 2221 is the outer edge of the bottom wall of the fourth mounting groove 222. In the thickness direction of the top cover assembly 200, the distance between the second connecting surface 2221 and the opening of the fourth mounting groove 222 gradually decreases from one end facing the exhaust hole 221 to one end away from the exhaust hole 221. The distance between the bottom wall of the fourth mounting groove 222 and the opening of the fourth mounting groove 222 first remains unchanged and then gradually increases from the direction close to the central axis of the fourth mounting groove 222 to the direction away from the central axis of the fourth mounting groove 222. That is, the area of ​​the bottom wall of the fourth installation groove 222 close to the central axis thereof is a plane, and the position of the plane corresponds to the opening of the air inlet hole 212 of the top cover 210 .

[0182] In this application scenario, when the electrolyte of the battery cell 320 splashes into the fourth mounting groove 222 of the lower plastic 220, the electrolyte will flow into the exhaust hole 221 located at the outer edge of the bottom wall of the fourth mounting groove 222 through the inclined surface on the bottom wall of the fourth mounting groove 222, and then flow back to the battery cell 320, thereby realizing the reflux of the electrolyte.

[0183] In the embodiments of this application, please refer to Figure 7 , Fig.14a , Fig.14b and Fig.14c , Fig.14c yes Figure 3 The structure diagram of the lower plastic 220 of the top cover assembly 200 shown in another angle. The lower plastic 220 may include a lower plastic body 224 and a first protrusion 225. The first protrusion 225 is fixedly connected to the lower plastic body 224 and is protruded relative to the surface of the lower plastic body 224 away from the top cover 210. The first protrusion 225 and the lower plastic body 224 may be connected to form an integrated structure by means such as integral molding.

[0184] The lower plastic body 224 may include a third surface 2241 and a fourth surface 2242. The third surface 2241 and the fourth surface 2242 are arranged opposite to each other in the thickness direction of the lower plastic body 224 (Z direction shown in the figure). The third surface 2241 is away from the battery cell 320. The fourth surface 2242 faces the battery cell 320. The third surface 2241 is connected to the second surface 2142 of the top cover 210. The lower plastic body 224 may be an integrated structure. In some other embodiments, the lower plastic body 224 may also be a split structure. Specifically, the lower plastic body 224 may include a first part and a second part. The first part and the second part are arranged in sequence in the length direction of the lower plastic body 224 (X direction shown in the figure). The first part and the second part are detachably connected.

[0185] The first protrusion 225 is connected to the fourth surface 2242 of the lower plastic body 224. In the thickness direction (Z direction in the figure) of the lower plastic 220, the protrusion height of the first protrusion 225 relative to the fourth surface 2242 is a first height H1.

[0186] The lower plastic body 224 and the first protrusion 225 may be provided with the exhaust hole 221 and the fourth mounting groove 222 described above. The exhaust hole 221 may penetrate the third surface 2241 and the fourth surface 2242 of the lower plastic body 224, and penetrate the side wall of the first protrusion 225 along the thickness direction of the lower plastic 220. The opening of the fourth mounting groove 222 is located on the third surface 2241. The fourth mounting groove 222 may be formed by being recessed from the third surface 2241 to the inside of the lower plastic body 224 and the first protrusion 225. The fourth mounting groove 222 is coaxially arranged with the first protrusion 225.

[0187] The lower plastic 220 may further include a baffle 226. One end of the baffle 226 is connected to the fourth surface 2242 of the lower plastic body 224, and the other end extends in a direction away from the top cover 210. The baffle 226 is continuously arranged around the circumferential direction of the first protrusion 225, and is arranged at intervals from the first protrusion 225. That is, the baffle 226 is annular and surrounds the first protrusion 225. The circumferential direction of the first protrusion 225 is a direction that surrounds the central axis of the first protrusion 225. The baffle 226 is located on the side of the exhaust hole 221 away from the fourth mounting groove 222. In the thickness direction of the lower plastic 220, the protruding height of the baffle 226 relative to the fourth surface 2242 is a second height H2. The second height H2 of the baffle 226 is greater than the first height H1 of the first protrusion 225. The baffle 226 and the lower plastic body 224 can be connected to form an integrated structure by a method such as integral molding.

[0188] In some other embodiments, the baffle 226 may be located on a side of the exhaust hole 221 away from the fourth mounting groove 222 , and may be disposed intermittently around the circumferential direction of the first protrusion 225 .

[0189] It is understandable that the baffle 226 is provided on the side of the exhaust hole 221 of the lower plastic 220 away from the fourth mounting groove 222, which can reduce the shaking of the battery cell 320, reduce the possibility of the electrolyte splashing into the fourth mounting groove 222 of the lower plastic 220, and further reduce the risk of the electrolyte overflowing the battery 300. The height of the baffle 226 is set to be greater than the height of the first convex portion 225, so that the electrolyte in the fourth mounting groove 222 can be blocked by the baffle 226 when flowing into the battery cell 320 through the exhaust hole 221, thereby vertically flowing the electrolyte into the predetermined position in the battery cell 320, that is, the electrolyte flows into the middle inner circle position of the battery cell 320.

[0190] The lower plastic 220 may further include a support portion 227. The support portion 227 is connected to the fourth surface 2242 of the lower plastic body 224 and is spaced apart from the baffle 226. In the thickness direction of the lower plastic 220, the protruding height of the support portion 227 relative to the fourth surface 2242 is a third height H3. The third height H3 of the support portion 227 is greater than the second height H2 of the baffle 226. The support portion 227 may be used to abut against the battery cell 320 and support the battery cell 320 to prevent the battery cell 320 from directly contacting the top cover 210 and causing a short circuit.

[0191] The number of the support parts 227 can be one or more. When the number of the support parts 227 is multiple, the positions of the multiple support parts 227 are different, and the structures can be the same, similar or different. Exemplarily, the number of the support parts 227 is three. In the length direction of the lower plastic 220, two of the support parts 227 are located at both ends of the lower plastic 220, and one support part 227 is arranged on the lower plastic 220 at a position corresponding to the explosion-proof hole 217 of the top cover 210.

[0192] It is understandable that setting the height of the support portion 227 to be greater than the height of the baffle 226 can ensure that the baffle 226 does not directly contact the battery cell 320 but has a certain distance from the battery cell 320, thereby reducing the possibility of the electrolyte in the battery cell 320 entering the lower plastic 220.

[0193] The lower plastic 220 may also be provided with a second injection hole 229. In the length direction of the lower plastic 220 (X direction in the figure), the second injection hole 229 may be arranged between the support portion 227 and the second through hole 228b, and is located at both ends of the support portion 227 with the fourth mounting groove 222. Among them, the support portion 227 is located at a position in the lower plastic 220 corresponding to the explosion-proof hole 217 of the top cover 210. The second injection hole 229 is spaced apart from the support portion 227, the fourth mounting groove 222 and the second through hole 228b. The second injection hole 229 may penetrate the third surface 2241 and the fourth surface 2242. That is, the second injection hole 229 penetrates the lower plastic body 224 along the thickness direction of the lower plastic body 224. The second injection hole 229 can be used to communicate with the first injection hole 218 of the top cover 210, and is used to inject electrolyte into the battery cell 320.

[0194] Please refer to Figure 7 , Fig.14a , Fig.14b and Fig.14c , the lower plastic 220 may be provided with a second groove 228a and a second through hole 228b. The opening of the second groove 228a is located on the surface of the lower plastic 220 away from the top cover 210. That is, the opening of the second groove 228a is located on the fourth surface 2242. The second groove 228a can be formed from the fourth surface 2242 to the inner recess of the lower plastic 220. The second groove 228a can be used to install the pole base 242 of the pole 240. The second through hole 228b is coaxially arranged and connected with the second groove 228a. The second through hole 228b can pass through the third surface 2241 and the bottom wall of the second groove 228a along the thickness direction of the lower plastic 220. That is, one end opening of the second through hole 228b is located on the third surface 2241, and the other end opening is located on the bottom wall of the second groove 228a. The second through hole 228b is connected with the first through hole 216b of the top cover 210. The second through hole 228b can be used for the pole 240 to pass through and accommodate the fourth body 2414 of the pole 240. The inner surface of the second through hole 228b can be spaced apart from the outer peripheral surface of the fourth body 2414 of the pole 240. The outer peripheral surface of the fourth body 2414 of the pole 240 is the outer surface surrounding the central axis of the fourth body 2414. The inner surface of the second through hole 228b is the surface surrounding the central axis of the second through hole 228b.

[0195] The number of the second grooves 228a can be two, and the two second grooves 228a are arranged at intervals in the length direction of the lower plastic 220. Each second groove 228a can be used to install a pole base 242 of a pole 240. The number of the second through holes 228b can be two, and the two second through holes 228b can be arranged at intervals in the length direction of the lower plastic 220, and are respectively coaxially arranged and connected with the two second grooves 228a. One of the second through holes 228b is used for the positive pole to pass through. The other first through hole 216b is used for the negative pole to pass through.

[0196] In an embodiment of the present application, the lower plastic 220 may include a second boss 228c. The second boss 228c is connected to the third surface 2241 of the lower plastic body 224 and is protruding relative to the third surface 2241. The second boss 228c and the lower plastic body 224 may be connected to form an integrated structure by means such as integral molding. The second boss 228c is located in the first groove 216a of the top cover 210. The second boss 228c is separated from the bottom wall of the first groove 216a of the top cover 210 by the upper plastic 230. The surface of the second boss 228c facing away from the top cover body 214 abuts against the sixth surface 232 of the upper plastic 230. Through the connection between the second boss 228c of the lower plastic 220 and the first groove 216a of the top cover 210, the alignment connection between the lower plastic 220 and the top cover 210 can be helped, thereby improving the assembly efficiency of the top cover assembly 200 and the battery 300.

[0197] For example, the number of the second bosses 228c may be two, and the two second bosses 228c are arranged at intervals in the length direction of the lower plastic 220. Each second boss 228c is located in a first groove 216a of the top cover 210.

[0198] The lower plastic body 224 and the second boss 228c may be provided with the second through hole 228b and the second groove 228a described above. The opening of the second groove 228a may be located on the fourth surface 2242. The second groove 228a may be formed by being recessed from the fourth surface 2242 to the interior of the lower plastic 220. The bottom wall of the second groove 228a may be located in the lower plastic body 224, and the second through hole 228b may penetrate the second boss 228c and at least a portion of the lower plastic body 224 along the thickness direction of the lower plastic 220. Alternatively, the bottom wall of the second groove 228a may be located in the second boss 228c, and the second through hole 228b may penetrate a portion of the second boss 228c along the thickness direction of the lower plastic 220. Alternatively, the bottom wall of the second groove 228a may be flush with the third surface 2241, and the second through hole 228b may penetrate the second boss 228c along the thickness direction of the lower plastic 220.

[0199] Please refer to Figure 7 and Fig.15, Fig.15 yes Figure 3 A structural schematic diagram of the upper plastic 230 of the top cover assembly 200 shown. The upper plastic 230 may include a fifth surface 231 and a sixth surface 232. The fifth surface 231 and the sixth surface 232 are arranged opposite to each other in the thickness direction (Z direction in the figure) of the upper plastic 230. The fifth surface 231 is away from the battery cell 320. The sixth surface 232 faces the battery cell 320. The fifth surface 231 abuts against the surface of the second body 2412 of the pole 240 close to the pole base 242. The sixth surface 232 abuts against the surface of the fourth body 2414 of the pole 240 away from the pole base 242.

[0200] The upper plastic 230 may be provided with a third through hole 233. The third through hole 233 may penetrate the fifth surface 231 and the sixth surface 232. That is, the third through hole 233 penetrates the upper plastic 230 along the thickness direction of the upper plastic 230. The third through hole 233 of the upper plastic 230 may be coaxially arranged and communicated with the first through hole 216b of the top cover 210 and the second through hole 228b of the lower plastic 220. The third through hole 233 is used for the pole 240 to pass through and for accommodating the third body 2413 of the pole 240. The inner surface of the third through hole 233 may abut against the outer peripheral surface of the third body 2413 of the pole 240. Among them, the inner surface of the third through hole 233 is a surface that surrounds the central axis of the third through hole 233. The outer peripheral surface of the third body 2413 is an outer surface that surrounds the central axis of the third body 2413.

[0201] The number of the upper plastic 230 can be two. The two upper plastics 230 are spaced apart in the length direction of the upper plastic 230 (the X direction in the figure). One of the upper plastics 230 is installed on a positive pole. The other upper plastic 230 is installed on a negative pole. The number of the third through holes 233 can be two, and the two third through holes 233 can be spaced apart in the length direction of the upper plastic 230. One of the third through holes 233 is used for the positive pole to pass through. The other third through hole 233 is used for the negative pole to pass through.

[0202] The upper plastic 230 may be provided with a second slot 234. The opening of the second slot 234 is located on the outer peripheral surface of the upper plastic 230. The outer peripheral surface of the upper plastic 230 is an outer surface that surrounds the central axis of the upper plastic 230. The second slot 234 may be formed from the outer peripheral surface of the upper plastic 230 to the inner recess of the upper plastic 230. The second slot 234 is arranged around the circumferential direction of the third through hole 233. The circumferential direction of the third through hole 233 is a direction that surrounds the central axis of the third through hole 233. The bottom wall of the second slot 234 is spaced and arranged parallel to the inner surface of the third through hole 233. That is, the second slot 234 is annular and surrounds the third through hole 233. The second slot 234 may include a first side surface 234a and a second side surface 234b. The first side surface 234a and the second side surface 234b may be arranged opposite to each other in the thickness direction of the upper plastic 230. The first side surface 234a is close to the fifth surface 231. The second side surface 234b is close to the sixth surface 232. The second slot 234 can be used to install a portion of the top cover 210. The bottom wall of the second slot 234 abuts against the inner surface of the first through hole 216b of the top cover 210. The first side surface 234a abuts against the surface of the first boss 216c of the top cover 210 that is away from the top cover body 214. The second side surface 234b abuts against the bottom wall of the first groove 216a of the top cover 210.

[0203] For example, the number of the second slots 234 may be two, and the two second slots 234 are spaced apart in the length direction of the upper plastic 230. Each second slot 234 is connected to a portion of the top cover 210.

[0204] It can be understood that by providing a second card groove 234 recessed in the radial direction of the upper plastic 230 in the upper plastic 230 and connecting the second card groove 234 to the top cover 210, the installation stability of the upper plastic 230 and the top cover 210 can be increased, and the top cover 210 can be prevented from moving in the thickness direction of the top cover assembly 200.

[0205] Please refer to Figure 7 and Fig.16 , Fig.16 yes Figure 3A structural schematic diagram of a pole 240 of a top cover assembly 200 shown. The pole 240 is mounted on the upper plastic 230, the top cover 210 and the lower plastic 220. The opposite ends of the pole 240 are respectively protruded relative to the fifth surface 231 of the upper plastic 230 and the fourth surface 2242 of the lower plastic 220. Specifically, the pole 240 may include a pole body 241 and a pole base 242. The pole base 242 is located on a side of the top cover 210 close to the lower plastic 220. One end of the pole body 241 is fixedly connected to the pole base 242. The pole body 241 passes through the second through hole 228b of the lower plastic 220, the first through hole 216b of the top cover 210 and the third through hole 233 of the upper plastic 230. The other end of the pole body 241 extends out of the upper plastic 230.

[0206] The pole body 241 may include a first body 2411, a second body 2412, a third body 2413 and a fourth body 2414. The first body 2411, the second body 2412, the third body 2413 and the fourth body 2414 are connected in sequence and coaxially arranged. One end of the fourth body 2414 is connected to the pole base 242. The third body 2413 is connected between the fourth body 2414 and the second body 2412. The first body 2411 is connected to the surface of the second body 2412 away from the third body 2413. The pole base 242 and the first body 2411, the second body 2412, the third body 2413 and the fourth body 2414 of the pole 240 can be an integrated structure. The cross-sectional width of the first body 2411 along the thickness direction of the pole 240 (Z direction in the figure) is smaller than the cross-sectional width of the second body 2412 along the thickness direction of the pole 240. The cross-sectional width of the third body 2413 along the thickness direction of the pole 240 is smaller than the cross-sectional width of the second body 2412 along the thickness direction of the pole 240, and is also smaller than the cross-sectional width of the fourth body 2414 along the thickness direction of the pole 240. The cross-sectional width of the pole base 242 along the thickness direction of the pole 240 is greater than the cross-sectional width of the pole body 241 (including the first body 2411, the second body 2412, the third body 2413 and the fourth body 2414) along the thickness direction of the pole 240.

[0207] It is understandable that by configuring the pole body 241 to be four parts of different sizes, the upper plastic 230, the top cover 210 and the lower plastic 220 can be better installed in the corresponding parts to avoid misalignment. Moreover, the size of the pole base 242 is larger than that of the pole body 241, which can effectively prevent the pole 240 from slipping.

[0208] In the embodiment of the present application, the first body 2411 and the second body 2412 of the pole 240 are protruded relative to the fifth surface 231 of the upper plastic 230. The surface of the second body 2412 close to the pole base 242 abuts against the fifth surface 231 of the upper plastic 230. The third body 2413 of the pole 240 is located in the third through hole 233 of the upper plastic 230 and the first through hole 216b of the top cover 210, and is separated from the top cover 210 by the upper plastic 230. The outer peripheral surface of the third body 2413 abuts against the inner surface of the third through hole 233 of the upper plastic 230. The fourth body 2414 of the pole 240 is located in the second through hole 228b of the lower plastic 220. There is a gap between the outer peripheral surface of the fourth body 2414 and the inner surface of the second through hole 228b of the lower plastic 220. The surface of the fourth body 2414 facing away from the pole base 242 abuts against the sixth surface 232 of the upper plastic 230. Part of the pole base 242 of the pole 240 is located in the second through hole 228b of the lower plastic 220, and part of the pole base 242 protrudes relative to the fourth surface 2242 of the lower plastic 220.

[0209] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pressure relief valve assembly, the pressure relief valve assembly is used to be connected to a top cover, the top cover is provided with a first mounting groove and an air inlet hole that are connected to each other, characterized in that: The pressure relief valve assembly includes a pressure plate, an elastic member, a first seal and a second seal which are sequentially arranged in the first mounting groove, the elastic member elastically abuts between the pressure plate and the first seal, the second seal is located between the first seal and the bottom wall of the first mounting groove, and the second seal is also located at the outer edge of the air inlet hole; A first air passage is formed in a gap area between the first sealing member and the side wall of the first mounting groove, a second air passage is formed in a gap area between the first sealing member and the pressing plate, a third air passage is provided on the elastic member, and an air outlet is provided on the pressing plate, wherein the air outlet communicates with the inside of the pressure relief valve assembly and the outside of the pressure relief valve assembly; When the air pressure at the air inlet is less than a preset threshold of the pressure relief valve assembly, the first sealing member is pressed against the second sealing member by the elastic member to seal the air inlet; When the air pressure at the air inlet is greater than or equal to a preset threshold value of the pressure relief valve assembly, the first sealing member is pushed by the gas at the air inlet and separated from the second sealing member, and the air inlet, the first air channel, the second air channel, the third air channel and the air outlet are connected in sequence to form a gas channel for the gas at the air inlet to pass through.

2. The pressure relief valve assembly according to claim 1, characterized in that: The pressure plate includes a pressure plate body and a flange, the pressure plate body is provided with the air outlet, the flange is located on the side of the pressure plate body facing the elastic member, one end of the flange is connected to the outer edge of the air outlet, and the other end of the flange falls into the pressure plate body along the thickness direction of the pressure plate. The flange is bent relative to the pressure plate body and cooperates with the pressure plate body to form a first slot, and part of the elastic member is located in the first slot and abuts between the pressure plate body and the flange.

3. The pressure relief valve assembly according to claim 2, characterized in that: A second mounting groove is recessed on the surface of the pressure plate body facing the elastic member. The second mounting groove is communicated with the first clamping groove, and a portion of the elastic member is located in the second mounting groove.

4. The pressure relief valve assembly according to claim 2, characterized in that: The elastic member includes a first connecting portion and a plurality of legs, at least a portion of the first connecting portion is located in the first slot, and the plurality of legs are spaced apart in the circumferential direction of the first connecting portion, and each of the legs includes a first connecting end and a second connecting end, the first connecting end is fixedly connected to the outer edge of the first connecting portion, the second connecting end abuts against the first sealing member, and the second connecting end can move relative to the first sealing member along the radial direction of the first connecting portion.

5. The pressure relief valve assembly according to claim 4, characterized in that: The elastic member also includes a second connecting portion, which is annular. The second connecting end is fixedly connected to the inner edge of the second connecting portion. The second connecting portion and the first connecting portion are spaced apart in the thickness direction of the elastic member and abut against the first sealing member. The second connecting portion can move relative to the first sealing member along the radial direction of the first connecting portion.

6. The pressure relief valve assembly according to claim 4 or 5, characterized in that: The third air channel includes a first sub-air channel and a second sub-air channel, the first sub-air channel is a gap area between two adjacent legs, the first sub-air channel is connected to the first air channel, the second sub-air channel is a through hole that penetrates the first connecting part along the thickness direction of the first connecting part, and the second sub-air channel is connected to the air outlet.

7. The pressure relief valve assembly according to any one of claims 1 to 5, characterized in that: The elastic member is in line contact with the first sealing member.

8. The pressure relief valve assembly according to any one of claims 1 to 5, characterized in that: The first sealing member includes a first sealing body and a retaining wall; The first sealing body comprises a first surface and a second surface, the first surface and the second surface are arranged opposite to each other in the thickness direction of the first sealing body, the first surface abuts against the elastic member, and the second surface abuts against the second sealing member; The retaining wall is connected to the outer edge of the first sealing body and protrudes relative to the first surface. The retaining wall also surrounds a portion of the elastic member. The end of the retaining wall away from the first sealing body is spaced apart from the pressure plate. The gap area between the outer peripheral surface of the retaining wall and the side wall of the first mounting groove forms the first air channel.

9. The pressure relief valve assembly according to claim 8, characterized in that: A portion of the first surface in contact with the elastic member is a plane.

10. The pressure relief valve assembly according to any one of claims 1 to 5, characterized in that: The second sealing member is in line contact with the first sealing member, and / or the second sealing member is in line contact with the first mounting groove.

11. The pressure relief valve assembly according to any one of claims 1 to 5, characterized in that: The second sealing member includes an inner ring body and an outer ring body, wherein the inner ring body abuts between the first sealing member and the bottom wall of the first mounting groove, and the outer ring body surrounds and is connected to the outer edge of the inner ring body, and the thickness of the outer ring body is less than the thickness of the inner ring body.

12. A top cover assembly, characterized in that: The top cover assembly includes a top cover and a pressure relief valve assembly as described in any one of claims 1 to 11, the top cover is provided with a first mounting groove and an air inlet hole that are connected, and the pressure relief valve assembly is located in the first mounting groove and covers the air inlet hole.

13. The top cover assembly according to claim 12, characterized in that: The first mounting groove includes a first groove and a second groove, the first groove and the second groove are coaxially arranged, the cross-sectional width of the first groove along the thickness direction of the top cover is greater than the cross-sectional width of the second groove along the thickness direction of the top cover, a first step surface is formed at the connection between the first groove and the second groove, the pressure plate is located in the first groove and abuts against the first step surface, the elastic member is located in the first groove and the second groove, and the first seal and the second seal are both located in the second groove.

14. A battery, characterized in that: The battery comprises a battery cell, a shell and a top cover assembly as described in claim 12 or 13, wherein the top cover assembly is connected to the shell and is arranged together with the shell to form a receiving space, and the battery cell is located in the receiving space.

15. An electrical equipment, characterized in that: The electric device comprises the battery as claimed in claim 14.

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