Battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery, a cover plate or a shell of the battery is provided with a mounting hole, and two opposite sides of the mounting hole are respectively provided with a first sinking table and a second sinking table. The anti-explosion valve protection piece is embedded in the first sinking table, and the fixing ring is connected with the side, away from the containing cavity, of the cover plate in a welded mode so that the anti-explosion valve protection piece can be fixed. The anti-explosion valve is embedded in the second sinking table and connected with the cover plate or the shell in a welded mode. A first thinning part is arranged on the anti-explosion valve protection sheet, and an air hole communicated with the mounting hole is formed in the first thinning part. And when the battery is not subjected to thermal runaway, the air holes can block the electrolyte, so that the explosion-proof valve is protected, and the explosion-proof valve is prevented from being corroded by the overflowing electrolyte during liquid injection. And the explosion-proof valve protection sheet does not need to be bonded with the cover plate through back glue, so that the adverse effect of high temperature generated in the welding process of the cover plate and the shell on the explosion-proof valve protection sheet is avoided, the reliability of the explosion-proof valve protection sheet is improved, and the explosion-proof valve protection sheet is not prone to falling off and losing efficacy.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery. Background Art

[0002] At present, there is a pressure relief explosion-proof valve on the battery shell or cover to prevent the battery from exploding due to large gas production when it is under thermal runaway. Generally speaking, in order to protect the explosion-proof valve, an explosion-proof valve protection patch is installed above the explosion-proof valve to prevent dust, electrolyte and other pollution and foreign matter from damaging the explosion-proof valve.

[0003] There is a cutout on one side of the explosion-proof valve protection patch. During the battery filling process, a small amount of electrolyte overflows. Due to the existence of the cutout, the electrolyte easily flows through the cutout to the surface of the explosion-proof valve, and the electrolyte will corrode the explosion-proof valve, causing the explosion-proof valve to fail. In addition, during the welding process of the cover plate and the shell, when the width of the cover plate is small, the high temperature generated during the welding process will cause the explosion-proof valve protection patch to deform and the adhesive to melt, causing the explosion-proof valve protection patch to fall off and fail. Summary of the invention

[0004] The object of the present invention is to provide a battery which can prevent electrolyte from entering into an explosion-proof valve, thereby avoiding failure of the explosion-proof valve, and can also reduce burns to the explosion-proof valve protection sheet during welding of a cover plate and a shell.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a battery comprising:

[0007] A cover plate and a shell, wherein at least one end of the shell is provided with an opening, the cover plate is connected to a side of the shell provided with the opening and encloses a receiving cavity, a mounting hole is provided on one side wall of the cover plate and / or the shell, a first sinking platform is provided on the inner wall of the mounting hole on a side away from the receiving cavity, and a second sinking platform is provided on the inner wall of the mounting hole on a side close to the receiving cavity;

[0008] An explosion-proof valve protection sheet is embedded in the first sinking platform, the explosion-proof valve protection sheet is provided with a first thinning portion, and the first thinning portion is provided with an air hole;

[0009] A fixing ring, the fixing ring is welded to the cover plate and / or the shell to press the explosion-proof valve protection sheet against the first bottom wall of the first sink;

[0010] The explosion-proof valve is embedded in the second sink platform. The explosion-proof valve has a pressure relief channel after opening. The accommodating cavity, the pressure relief channel, the mounting hole and the air hole are connected in sequence.

[0011] Optionally, the first thinned portion is annular, and the explosion-proof valve protection sheet further includes a first fixing portion and a first main body portion, the first fixing portion is arranged on the circumferential outer side of the first thinned portion, and the first main body portion is located on the circumferential inner side of the first thinned portion.

[0012] Optionally, along the radial direction of the mounting hole, a distance between a peripheral side wall of the first fixing portion and a first side wall of the first sinking platform is C;

[0013] The value range of C is: 0.3mm≤C≤1.0mm.

[0014] Optionally, along the radial direction of the mounting hole, the width of the first fixing portion is L1, and the width of the first sinking platform is L2;

[0015] L1, L2 and C satisfy: L1>L2-C;

[0016] The value range of L1 is: 0.1mm≤L1≤0.3mm.

[0017] Optionally, along the axial direction of the mounting hole, the thickness of the first main body portion is h1, and the thickness of the first thinned portion is h2;

[0018] h1 and h2 satisfy: h1 / 3≤h2≤h1 / 2;

[0019] The value range of h1 is: 0.1mm≤h1≤0.25mm.

[0020] Optionally, along the radial direction of the mounting hole, the width of the first thinned portion is b, and the value range of b is: 0.3mm≤b≤1.0mm.

[0021] Optionally, the pores are provided in plurality, and the plurality of pores are arranged at intervals on the first thinned portion, the pores are circular holes, and the diameter of the pores is d;

[0022] The value range of d is: 0.05mm≤d≤0.15mm.

[0023] Optionally, the fixing ring is embedded in the first sink, and an end surface of the fixing ring facing away from the accommodating cavity is flush with an end surface of the cover plate and / or the side wall of the shell facing away from the accommodating cavity.

[0024] Optionally, the fixing ring is welded to the cover plate and / or the shell to form a welding portion, and along the axial direction of the mounting hole, the thickness of the fixing ring is P, the penetration of the welding portion is W, and P>W.

[0025] Optionally, the explosion-proof valve protection sheet is made of PET, and the fixing ring, the shell and the cover plate are made of aluminum.

[0026] The beneficial effects of the present invention are as follows:

[0027] The present invention provides a battery, which includes a cover plate and a housing. An installation hole is provided on the cover plate or the housing. A first counterbore is provided on one side of the inner wall of the installation hole away from the accommodating cavity, and a second counterbore is provided on one side of the inner wall of the installation hole close to the accommodating cavity. The explosion-proof valve protection piece is embedded at the first counterbore, and the fixing ring is welded to the side of the cover plate / housing away from the accommodating cavity, and the explosion-proof valve protection piece is fixed on the cover plate / housing through the fixing ring. The explosion-proof valve is embedded at the second counterbore, and the explosion-proof valve is welded to the cover plate / housing, thereby realizing the fixation of the explosion-proof valve. By adopting the above installation method, the explosion-proof valve protection piece is provided with a first thinning part, and air holes are provided at the first thinning part. The air holes are communicated with the installation hole. When the battery does not undergo thermal runaway, the air holes can block the electrolyte, thereby protecting the explosion-proof valve and preventing the explosion-proof valve from being corroded by the overflowing electrolyte during liquid injection. The air holes can also play a role in ventilation. At the same time, the explosion-proof valve protection piece does not need to use adhesive to bond with the cover plate / housing, thereby avoiding the adverse effects of the high temperature generated during the welding of the cover plate and the housing on the explosion-proof valve protection piece, improving the reliability of the explosion-proof valve protection piece, and not easily falling off and failing. Description of the Drawings

[0028] Figure 1 is an exploded view of the cover plate, the explosion-proof valve protection piece and the explosion-proof valve provided in the embodiment of the present invention;

[0029] Figure 2 is a sectional view of the cover plate, the explosion-proof valve protection piece and the explosion-proof valve provided in the embodiment of the present invention;

[0030] Figure 3 is Figure 2 a partial enlarged view of part A in

[0031] Figure 4 is Figure 2 a partial enlarged view of part B in

[0032] Figure 5 is a sectional view of the explosion-proof valve protection piece provided in the embodiment of the present invention;

[0033] Figure 6 is a top view of the explosion-proof valve protection piece provided in the embodiment of the present invention.

[0034] In the figure:

[0035] 100, Cover plate; 110, Mounting hole; 111, First sunk platform; 1111, First platform bottom wall; 1112, First platform side wall; 112, Second sunk platform; 1121, Second platform bottom wall; 1122, Second platform side wall; 300, Explosion-proof valve protection piece; 310, First thinning part; 311, Air hole; 320, First fixing part; 330, First body part; 400, Fixing ring; 401, Welding part; 500, Explosion-proof valve; 510, Second fixing part; 520, Second body part; 521, Second thinning part. Detailed implementation mode

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and that the first feature is "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. That the first feature is "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mount", "connect" and "couple" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0040] Embodiment 1

[0041] As Figures 1-4 shown, this embodiment provides a battery, which includes a cover plate 100 and a housing 200. At least one end of the housing 200 is provided with an opening 201. The cover plate 100 is connected to the side of the housing 200 where the opening 201 is provided and encloses a receiving cavity. The cover plate 100 is provided with a mounting hole 110. On the side of the inner wall of the mounting hole 110 away from the receiving cavity, a first sinking platform 111 is provided. On the side of the inner wall of the mounting hole 110 close to the receiving cavity, a second sinking platform 112 is provided. The explosion-proof valve protection piece 300 is embedded at the first sinking platform 111. The fixing ring 400 is welded to the side of the cover plate 100 away from the receiving cavity to press the explosion-proof valve protection piece 300 against the first bottom wall 1111 of the first sinking platform 111, and the fixing of the explosion-proof valve protection piece 300 on the cover plate 100 is realized through the fixing ring 400. Optionally, the fixing ring 400 is also embedded at the first sinking platform 111, and the circumferential side wall of the fixing ring 400 is welded to the first side wall 1112 of the first sinking platform 111.

[0042] When the above installation method is adopted, the explosion-proof valve protection piece 300 does not need to be adhered to the cover plate 100 with back glue, thus avoiding the adverse effect on the explosion-proof valve protection piece 300 caused by the high temperature generated during the welding of the cover plate 100 and the housing 200. The reliability of the fixing of the explosion-proof valve protection piece 300 on the cover plate 100 is high, and it is not easy to fall off and fail. It should be noted that the welding power during the welding of the fixing ring 400 and the cover plate 100 is much smaller than the welding power during the welding of the cover plate 100 and the housing 200, so the explosion-proof valve protection piece 300 will not be deformed.

[0043] The explosion-proof valve 500 is embedded in the second sinking platform 112. The end surface of the circumferential edge of the explosion-proof valve 500 away from the receiving cavity abuts against the second bottom wall 1121 of the second sinking platform 112, and the circumferential side wall of the explosion-proof valve 500 is welded to the second side wall 1122 of the second sinking platform 112, thereby realizing the fixing of the explosion-proof valve 500 on the cover plate 100.

[0044] The explosion-proof valve protection piece 300 is provided with a first thinning portion 310. Along the axial direction of the mounting hole 110 ( Figure 1In the Z-axis direction shown in the figure, the projection of the first thinning portion 310 on the cover plate 100 coincides with the explosion-proof valve 500. After the explosion-proof valve 500 is opened, there is a pressure relief channel, and the accommodation cavity, the pressure relief channel, and the mounting hole 110 are communicated in sequence. Thus, after the battery undergoes thermal runaway, the high-temperature and high-pressure gas will break through the first thinning portion 310, and a channel for the high-temperature and high-pressure gas to flow is formed inside the first thinning portion 310, facilitating pressure relief. Further, air holes 311 are provided at the first thinning portion 310, and the air holes 311 are communicated with the mounting hole 110. When the battery does not undergo thermal runaway, the air holes 311 can block the electrolyte, thereby protecting the explosion-proof valve 500 and preventing the explosion-proof valve 500 from being corroded by the overflowing electrolyte during liquid injection. At the same time, the air holes 311 also play a role in ventilation to ensure the accuracy of helium leak detection. Otherwise, if the air holes 311 are not provided, when there is a poor welding between the explosion-proof valve 500 and the cover plate 100 and there is a gas leakage problem, the explosion-proof valve protection piece 300 may completely seal the mounting hole 110, affecting the accuracy of helium leak detection and posing a safety risk to the battery.

[0045] Optionally, the material of the explosion-proof valve protection piece 300 is PET, and the explosion-proof valve protection piece 300 is a colorless and transparent thin film. The materials of the fixing ring 400, the housing 200, and the cover plate 100 are aluminum, so as to weld the fixing ring 400 to the cover plate 100 and weld the cover plate 100 to the housing 200, ensuring good welding quality and high connection reliability.

[0046] Continue to refer to Figure 3 、 Figure 5 and Figure 6 In this embodiment, the first thinning portion 310 is annular. The explosion-proof valve protection piece 300 further includes a first fixing portion 320 and a first body portion 330. The first fixing portion 320 is disposed on the circumferential outer side of the first thinning portion 310, and the first body portion 330 is located on the circumferential inner side of the first thinning portion 310. The fixing ring 400 presses the first fixing portion 320 of the explosion-proof valve protection piece 300 against the first sinking platform 111. When the battery undergoes thermal runaway, the first thinning portion 310 ruptures, and a channel for the high-temperature and high-pressure gas to flow is formed at the position of the first body portion 330.

[0047] It should be noted that along the radial direction of the mounting hole 110 (such as Figure 4 、 Figure 5 the X-axis direction in the figure), the distance between the circumferential side wall of the first fixing portion 320 and the first side wall 1112 of the first sinking platform 111 of the first sinking platform 111 is C, and the value range of C is: 0.3 mm ≤ C ≤ 1.0 mm. For example, the value of C can be 0.3 mm, 0.5 mm, 0.8 mm, or 1.0 mm. By arranging the circumferential side wall of the first fixing portion 320 at an interval from the first side wall 1112 of the first sinking platform 111, it is convenient to install the explosion-proof valve protection piece 300 at the first sinking platform 111 and prevent the explosion-proof valve protection piece 300 from interfering with the cover plate 100.

[0048] Further, in the radial direction of the mounting hole 110, the width of the first fixing portion 320 is L1, and the width of the first counterbore 111 is L2. L1, L2, and C satisfy: L1 > L2 - C. By adopting the above dimensional limitations, it is ensured that the first thinning portion 310 is exposed within the mounting hole 110, enabling high-temperature and high-pressure gas to directly act on the first thinning portion 310, thereby facilitating the tearing of the first thinning portion 310 to achieve the pressure relief function.

[0049] Optionally, the value range of L1 is: 0.1 mm ≤ b ≤ 0.3 mm. For example, the value of L1 can be 0.1 mm, 0.2 mm, or 0.3 mm, etc. By limiting the value of L1 within the above range, on the one hand, it is ensured that the first fixing portion 320 has sufficient mechanical strength to ensure the stability and firmness of the fixing of the explosion-proof valve protection piece 300; on the other hand, it is ensured that the area of the first body portion 330 is relatively large to meet the flow of high-temperature and high-pressure gas.

[0050] Continue to refer to Figure 3 , in the axial direction of the mounting hole 110, the thickness of the first body portion 330 is h1, and the thickness of the first thinning portion 310 is h2. h1 and h2 satisfy: h1 / 3 ≤ h2 ≤ h1 / 2. Preferably, the value of h2 can be one-third of h1. By adopting the above settings, on the one hand, it is ensured that the mechanical strength of the first thinning portion 310 is sufficient to prevent the first thinning portion 310 from deforming or cracking due to being pulled during the installation of the explosion-proof valve protection piece 300, and the reliability of the explosion-proof valve protection piece 300 is high; on the other hand, it is also necessary to ensure that the first thinning portion 310 can be smoothly torn when the explosion-proof valve protection piece 300 is impacted by high-temperature and high-pressure gas, thereby achieving smooth valve opening and pressure relief and ensuring relatively high safety of the battery.

[0051] Optionally, the value range of h1 is: 0.1 mm ≤ h1 ≤ 0.25 mm. For example, the value of h1 can be 0.1 mm, 0.2 mm, or 0.25 mm, etc. By limiting the value of h1 within the above range, it is ensured that the mechanical strength of the first body portion 330 is sufficient.

[0052] Furthermore, in this embodiment, the thickness of the first main body portion 330 along the axial direction of the mounting hole 110 is equal to the thickness of the first fixing portion 320 along the axial direction of the mounting hole 110, that is, the thickness of the first fixing portion 320 along the axial direction of the mounting hole 110 is also h1. The fixing ring 400 is embedded in the first sink 111, and the end face of the fixing ring 400 facing away from the accommodating cavity is flush with the end face of the cover plate 100 facing away from the accommodating cavity. Along the axial direction of the mounting hole 110, the thickness of the fixing ring 400 is P, and the depth of the first sink 111 is H. The relationship between h1, P and H satisfies: H=h1+P. By adopting the above-mentioned structural setting, the fixing ring 400 will not protrude from the end face of the cover plate 100 facing away from the accommodating cavity, and the appearance of the battery is good and the structure is regular. In addition, it is necessary to ensure that the fixing ring 400 will not cover the air hole 311 to facilitate exhaust.

[0053] Furthermore, the fixing ring 400 is welded to the cover plate 100 to form a welding portion 401. Along the axial direction of the mounting hole 110, the thickness of the fixing ring 400 is P, the penetration of the welding portion 401 is W, and P>W. In other words, the welding portion 401 will not spread to the first fixing portion 320 of the explosion-proof valve protection sheet 300, thereby ensuring that the structure of the explosion-proof valve protection sheet 300 is intact and safe and reliable to use.

[0054] Continue to see Figure 3 , Figure 5 and Figure 6 , along the radial direction of the mounting hole 110, the width of the first thinning portion 310 is b, and the value range of b is: 0.3mm≤b≤1.0mm. For example, the value of b can be 0.3mm, 0.5mm, 0.8mm or 1.0mm, etc. By limiting the value of b within the above range, it is ensured that the contact area between the high-temperature and high-pressure gas and the first thinning portion 310 is large, so that the first thinning portion 310 can be torn open smoothly.

[0055] Further, there are multiple pores 311 on the explosion-proof valve protection sheet 300, and the multiple pores 311 are evenly spaced on the first thinning portion 310, so that the force on the first thinning portion 310 is uniform, and the pores 311 are evenly exhausted. Optionally, the pores 311 are all circular holes, and the diameter of the pores 311 is d, and the value range of d is: 0.05mm≤d≤0.15mm. For example, the value of d can be 0.05mm, 0.08mm, 0.10mm, 0.12mm or 0.15mm, etc. It should be noted that in a specific embodiment, it should be ensured that the value of d is not greater than the value of b, that is, d≤b. Thus, it can be ensured that the pores 311 can pass through the gas, and the external liquid (electrolyte) will not flow through the pores 311 to the explosion-proof valve 500, which can ensure that the helium detection test is not affected, and at the same time achieve the protection of the explosion-proof valve 500.

[0056] Continue to seeFigure 4 , in this embodiment, the explosion-proof valve 500 includes a second fixing portion 510 and a second body portion 520. The second fixing portion 510 is disposed on the circumferential outer side of the second body portion 520, and a second thinning portion 521 is provided on the second body portion 520. The circumferential side wall of the second fixing portion 510 is welded to the second table side wall 1122 of the second sink 112, so as to fix the explosion-proof valve 500 on the cover plate 100. Along the axial direction of the mounting hole 110, the projection of the second thinning portion 521 on the cover plate 100 coincides with the projection of the mounting hole 110 on the cover plate 100, that is, the second thinning portion 521 is located inside the second table bottom wall 1121 of the second sink 112. When the battery undergoes thermal runaway, the second thinning portion 521 ruptures, and a pressure relief channel is formed at the position of a part of the second body portion 520 surrounded by the inside of the second thinning portion 521.

[0057] Embodiment Two

[0058] This embodiment provides a battery. The difference between this battery and the battery in Embodiment One is that in this embodiment, the mounting hole 110 is provided on one of the side walls of the housing 200. A first sink 111 is provided on the side of the inner wall of the mounting hole 110 away from the accommodating cavity, and a second sink 112 is provided on the side of the inner wall of the mounting hole 110 close to the accommodating cavity. The explosion-proof valve protection piece 300 and the fixing ring 400 are embedded in the first sink 111, and the fixing ring 400 is welded to the housing 200. A welding portion 401 is formed by welding the fixing ring 400 to the first table side wall 1112 of the first sink 111 on the housing 200. The end surface of the fixing ring 400 on the side away from the accommodating cavity is flush with the end surface of the side wall of the housing 200 on the side away from the accommodating cavity. The explosion-proof valve 500 is embedded in the second sink 112.

[0059] The rest of the structures in this embodiment are the same as those in Embodiment One, and will not be described in detail here.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery, characterized in that: include: A cover plate and a shell, wherein at least one end of the shell is provided with an opening, the cover plate is connected to a side of the shell provided with the opening and encloses a receiving cavity, a mounting hole is provided on one side wall of the cover plate and / or the shell, a first sinking platform is provided on the inner wall of the mounting hole on a side away from the receiving cavity, and a second sinking platform is provided on the inner wall of the mounting hole on a side close to the receiving cavity; An explosion-proof valve protection sheet is embedded in the first sinking platform, and a first thinning portion is provided on the explosion-proof valve protection sheet, and an air hole is provided at the first thinning portion; A fixing ring, the fixing ring being welded to the cover plate and / or the shell to press the explosion-proof valve protection sheet against the first bottom wall of the first sink; The explosion-proof valve is embedded in the second sink platform. The explosion-proof valve has a pressure relief channel after opening. The accommodating cavity, the pressure relief channel, the mounting hole and the air hole are connected in sequence.

2. The battery according to claim 1, characterized in that The first thinning portion is annular, and the explosion-proof valve protection sheet further includes a first fixing portion and a first main body portion, wherein the first fixing portion is arranged on the circumferential outer side of the first thinning portion, and the first main body portion is located on the circumferential inner side of the first thinning portion.

3. The battery according to claim 2, characterized in that Along the radial direction of the mounting hole, the distance between the peripheral side wall of the first fixing portion and the first platform side wall of the first sinking platform is C; The value range of C is: 0.3mm≤C≤1.0mm.

4. The battery according to claim 3, characterized in that Along the radial direction of the mounting hole, the width of the first fixing portion is L1, and the width of the first sinking platform is L2; L1, L2 and C satisfy: L1>L2-C; The value range of L1 is: 0.1mm≤L1≤0.3mm.

5. The battery according to claim 2, characterized in that Along the axial direction of the mounting hole, the thickness of the first main body portion is h1, and the thickness of the first thinned portion is h2; h1 and h2 satisfy: h1 / 3≤h2≤h1 / 2; The value range of h1 is: 0.1mm≤h1≤0.25mm.

6. The battery according to claim 1, characterized in that Along the radial direction of the mounting hole, the width of the first thinned portion is b, and the value range of b is: 0.3mm≤b≤1.0mm.

7. The battery according to claim 1, characterized in that The pores are provided in plurality, and the pores are arranged at intervals on the first thinned portion, the pores are circular holes, and the diameter of the pores is d; The value range of d is: 0.05mm≤d≤0.15mm.

8. The battery according to claim 1, characterized in that The fixing ring is embedded in the first sink, and the end surface of the fixing ring facing away from the accommodating cavity is flush with the end surface of the cover plate and / or the side wall of the shell facing away from the accommodating cavity.

9. The battery according to claim 8, characterized in that The fixing ring is welded to the cover plate and / or the shell to form a welding portion. Along the axial direction of the mounting hole, the thickness of the fixing ring is P, the penetration depth of the welding portion is W, and P>W.

10. The battery according to claim 1, characterized in that The explosion-proof valve protection sheet is made of PET, and the fixing ring, the shell and the cover plate are made of aluminum.

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