End cover assembly, battery and battery pack

Abstract

The utility model provides an end cap assembly, battery and battery pack, the end cap assembly comprises an end cap and a sealing element, the end cap is provided with a through hole, the sealing element comprises a guide part and a sealing part which are connected with each other, the sealing part is hermetically connected in the through hole, a cavity is arranged in the guide part, the guide part comprises a bottom surface, and the bottom surface is provided with a through hole. The bottom face is arranged at the end, away from the sealing part, of the guiding part, a first opening is formed in the bottom face and communicated with the cavity, and the height of the cavity is larger than or equal to one fourth of the height of the sealing part. When the sealing element enters the through hole, the cavity is communicated with the outside through the first opening, so that the guide part can elastically contract towards the cavity, the difficulty of mounting the sealing element in the through hole is reduced, and the sealing element can enter the through hole more quickly to improve the mounting efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an end cover assembly, a battery and a battery pack. Background Art

[0002] In the related art, the method for sealing the liquid injection hole of a battery is to first use a sealing rubber particle to block the liquid injection hole, and then stick a sealing aluminum sheet. The sealing aluminum sheet and the bare aluminum sheet provided with the liquid injection hole are welded into a whole by welding technology, so as to completely seal the liquid injection hole. If the structural design of the sealing rubber particle is unreasonable, the installation time will be increased, affecting the production efficiency. In the related art, the time for installing the sealing rubber particle into the liquid injection hole is long, and the production efficiency is low. Summary of the Utility Model

[0003] The embodiments of the utility model provide an end cover assembly, a battery and a battery pack, which can improve the technical problem of low production efficiency of batteries.

[0004] In a first aspect, the embodiments of the utility model provide an end cover assembly, including:

[0005] An end cover provided with a through hole;

[0006] A seal, the seal includes a guiding part and a sealing part connected to each other. The sealing part is sealingly connected in the through hole. A cavity is provided in the guiding part. The guiding part includes a bottom surface, the bottom surface is arranged at an end of the guiding part away from the sealing part, and a first opening is provided in the bottom surface. The first opening is communicated with the cavity, and the height of the cavity is greater than or equal to one-fourth of the height of the seal;

[0007] The diameter of the sealing part is greater than the diameter of the guiding part, and the diameter of the sealing part is greater than the diameter of the through hole. The diameter of the bottom surface is smaller than the diameter of the through hole. When the seal enters the through hole, the guiding part can elastically contract towards the cavity.

[0008] In one embodiment, the seal includes a side wall surrounding the cavity. A groove communicated with the cavity is provided in the side wall, and a second opening communicated with the groove is provided in the bottom surface.

[0009] In one embodiment, a plurality of the grooves are provided in the side wall, and the plurality of grooves are uniformly arranged around the cavity.

[0010] In one embodiment, the diameter of the cavity gradually decreases along the direction away from the bottom surface.

[0011] In one embodiment, the diameter of the guiding part gradually increases along the direction away from the bottom surface.

[0012] In one embodiment, the guiding portion includes a first outer surface, the sealing portion includes a second outer surface adjacent to the first outer surface, and the included angle between the first outer surface and the second outer surface is greater than 0° and less than or equal to 45°.

[0013] In one embodiment, the sealing portion includes a main body and a protrusion, the protrusion protrudes from the main body, and the protrusion is disposed around the main body.

[0014] In one embodiment, the guiding portion includes a connecting section and a guiding section, the connecting section is connected between the guiding section and the sealing portion, the connecting section includes a connecting surface, and the connecting surface is an arc structure.

[0015] In one embodiment, the sealing portion and the guiding portion are an integrally formed structure.

[0016] In a second aspect, an embodiment of the present invention provides a battery, the battery includes a housing, an electric core, and the end cap assembly as described above. The interior of the housing has a receiving cavity, the electric core is accommodated in the receiving cavity, the end cap assembly covers the housing, and the first opening faces the electric core.

[0017] In a third aspect, an embodiment of the present invention provides a battery pack, the battery pack includes a battery box body and the battery as described above, and the batteries are arranged in the battery box body.

[0018] The beneficial effects of the embodiments of the present invention:

[0019] The present invention provides an end cap assembly, the end cap assembly includes an end cap and a seal. The end cap is provided with a through hole, the seal is disposed in the through hole, and the diameter of the seal is at least partially greater than or equal to the diameter of the through hole to seal the through hole. Wherein, a cavity is provided in the seal, the seal includes a bottom surface, and the bottom surface is provided with a first opening communicating with the cavity. The seal includes a guiding portion and a sealing portion connected to each other. The sealing portion is sealingly connected in the through hole. A cavity is provided in the guiding portion. The guiding portion includes a bottom surface disposed at an end of the guiding portion away from the sealing portion. The bottom surface is provided with a first opening, and the first opening communicates with the cavity. The height of the cavity is greater than or equal to one-fourth of the height of the seal. The diameter of the sealing portion is greater than the diameter of the guiding portion, and the diameter of the sealing portion is greater than the diameter of the through hole. The diameter of the bottom surface is less than the diameter of the through hole. When the seal enters the through hole, since the cavity communicates with the outside through the first opening, the guiding portion can elastically contract towards the cavity, reducing the difficulty of installing the seal in the through hole, so that the seal can enter the through hole faster, thereby increasing the installation efficiency. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an end cover assembly provided by an embodiment of the present utility model.

[0022] Figure 2 is Figure 1 An enlarged schematic view of a partial area A of the end cover assembly shown.

[0023] Figure 3 is Figure 2 The structural schematic of the seal shown Figure 1 .

[0024] Figure 4 is Figure 2 The structural schematic of the seal shown Figure 2 .

[0025] Figure 5 is Figure 4 The bottom view of the seal shown.

[0026] Figure 6 is Figure 4 The top view of the seal shown.

[0027] Figure 7 is Figure 6 The sectional view of the seal shown along A - A.

[0028] Figure 8 is Figure 4 The front view of the seal shown.

[0029] Figure 9 is Figure 1 The front view of the end cover assembly shown Figure 1 .

[0030] Figure 10 is Figure 9 An enlarged schematic view of a partial area B of the end cover assembly shown.

[0031] Figure 11 is Figure 1 The front view of the end cover assembly shown Figure 2 .

[0032] Figure 12 is Figure 11 An enlarged schematic view of a partial area C of the end cover assembly shown.

[0033] Figure 13This is a schematic structural diagram of a battery provided by an embodiment of the present utility model.

[0034] Reference numerals:

[0035] 100, end cap assembly;

[0036] 10, end cap; 11, through hole;

[0037] 20, seal; 21, sealing part; 211, main body; 2110, second outer surface; 212, protrusion; 213, first step surface; 214, second step surface; 22, guiding part; 221, bottom surface; 222, first opening; 223, cavity; 2231, second opening; 2232, side wall; 2233, groove; 224, connecting section; 2241, connecting surface; 225, guiding section; 2251, first outer surface.

[0038] 200, battery; 201, housing. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0040] In the related art, after the lithium-ion battery is filled with liquid, in order to ensure the negative pressure environment in the housing to prevent external gas and moisture from entering the core, it is necessary to seal the liquid injection hole. The method for sealing the liquid injection hole of the battery is to first block the liquid injection hole with a sealing rubber particle, and then stick a sealing aluminum sheet, and use a welding process to weld the sealing aluminum sheet and the bright aluminum sheet provided with the liquid injection hole into a whole, so as to achieve complete sealing of the liquid injection hole. If the structural design of the sealing rubber particle is unreasonable, it will increase the installation time and affect the production efficiency.

[0041] Please refer to Figures 1 - 3 , Figure 1 This is a schematic structural diagram of an end cap assembly provided by an embodiment of the present utility model, Figure 2 is Figure 1 an enlarged schematic diagram of a partial A of the end cap assembly shown in Figure 3 is Figure 2Schematic structural diagram of the seal shown. The present application provides an end cap assembly 100, and the end cap assembly 100 includes an end cap 10. The end cap 10 is provided with a through hole 11. The through hole 11 can be a liquid injection hole for injecting electrolyte into the battery. The through hole 11 can also be other holes, such as an explosion-proof hole, etc. The end cap assembly 100 further includes a seal 20, and the seal 20 can cooperate with the through hole 11 to block the through hole 11. The seal 20 includes a guiding portion 22 and a sealing portion 21 connected to each other. The sealing portion 21 is sealingly connected inside the through hole 11. A cavity 223 is provided inside the guiding portion 22. The guiding portion 22 includes a bottom surface 221, and the bottom surface 221 is provided at one end of the guiding portion 22 away from the sealing portion 21. When the guiding portion 22 is inserted into the through hole 11, the guiding portion 22 is squeezed into the cavity 223 to facilitate the seal 20 to enter the through hole 11. The bottom surface 221 is provided with a first opening 222, and the cavity 223 is communicated with the first opening 222. The height of the cavity 223 is greater than or equal to one-fourth of the height of the seal 20. If the height is too small, it may cause the cavity 223 not to shrink normally during installation. In some embodiments, the height of the cavity 223 can be less than or equal to two-thirds of the height of the seal to avoid weakening the sealing effect of the seal 20.

[0042] Specifically, please refer to Figure 4 , Figure 4 the schematic structure of the seal shown Figure 2 . The diameter of the sealing portion 21 is greater than the diameter of the guiding portion 22, and the diameter of the sealing portion 21 is greater than the diameter of the through hole 11. The diameter of the bottom surface 221 is smaller than the diameter of the through hole 11. When the seal 20 enters the through hole 11, the guiding portion 22 can elastically contract towards the cavity 223. When the guiding portion 22 enters the through hole 11, the sealing portion 21 can abut against the periphery of the through hole 11. When pushing into the through hole 11, the sealing portion 21 abuts against the inner wall of the through hole 11 and is squeezed into the cavity 223 to increase the sealing effect with the through hole 11. The diameter of the sealing portion 21 can be slightly larger than the size of the guiding portion 22 to prevent too large a size difference. A first annular groove corresponding to the sealing portion 21 can also be provided on the inner wall of the through hole 11. After the seal 20 enters the through hole, the cooperation between the sealing portion 21 and the first annular groove can improve the sealing performance and reliability of the seal 20.

[0043] Specifically, when the seal 20 is installed in the through-hole, the diameter of the sealing portion 21 is larger than that of the through-hole 11, and the seal 20 and the through-hole 11 are in interference fit so that the seal 20 can seal the through-hole 11 when installed in the through-hole 11. During installation, the bottom surface 221 of the seal 20 faces the through-hole 11. The cavity 223 at the bottom of the guiding portion 22 is designed to have a compensating effect. When the seal 20 enters the through-hole 11, the design of the bottom cavity 223 weakens the strength of the seal 20. The cavity 223 communicates with the outside through the first opening 222. The seal 20 is elastically contracted towards the cavity 223 under the extrusion of the inner wall of the through-hole 11, deforming the seal 20, so that it can more conveniently enter the through-hole 11 and reduce the difficulty of installing the seal 20 in the through-hole 11, thereby increasing the installation efficiency. At the same time, the design of the cavity 223 also has a weight-reducing effect, thereby reducing the influence of the self-weight of the seal 20 on the weight of the end cover assembly 100.

[0044] In some embodiments, the seal 20 is made of an elastic material, such as rubber. Rubber has a certain elasticity, which can ensure that the seal 20 can deform and enter the through-hole 11 during installation and reset to maintain the seal after the extrusion force disappears. And the rubber part has a certain hardness, which can prevent the seal 20 from deforming too much and affecting the sealing effect.

[0045] Please refer to Figure 4 for reference Figure 5 , Figure 5 which is Figure 4 the bottom view of the shown seal. In some embodiments, the seal includes a side wall 2232 surrounding the cavity 223. The side wall 2232 is provided with a groove 2233 communicating with the cavity 223, and the bottom surface 221 is provided with a second opening 2231 communicating with the groove 2233. Specifically, the cavity 223 is provided in the middle of the bottom surface 221, and the groove 2233 extends in a direction away from the cavity 223. On the one hand, the groove 2233 plays a certain compensating role. When the seal 20 enters the through-hole 11, the groove 2233 and the cavity 223 contract inward together. On the other hand, during the operation of the battery, the battery core generates gas, and this area expands outward, making it difficult for the seal 20 to fall off. Among them, the opening 222 is a circular opening, and the cavity 223 is a cylindrical channel. Centered on the cavity 223, a plurality of grooves 2233 extend radially outward from the center. The groove 2233 can be a rectangular structure, and the height at which the groove 2233 extends from the bottom surface 221 in a direction away from the bottom surface is the same as the height of the cavity 223.

[0046] In some embodiments, the opening 222 can also be a square opening, a rhombus opening, etc. The present application does not limit the specific structure of the opening 222 here.

[0047] In some embodiments, the groove 2233 can also be a triangular structure, an oval structure, etc. The present application does not limit the specific structure of the groove 2233 herein.

[0048] In some embodiments, a plurality of grooves 2233 are formed in the side wall 2232, and the plurality of grooves 2233 are uniformly arranged around the cavity 223. Specifically, the plurality of grooves 2233 are connected to the periphery of the cavity 223, and the angle between any two adjacent grooves 2233 is equal. The uniform arrangement of the grooves 2233 around the cavity 223 can increase the structural stability, so that the shrinkage effect generated inside the seal 20 when the seal 20 enters is the same around, reducing the deformation of the seal 20. Among them, the angle between any two adjacent grooves 2233 can be 30°, 45°, 60°, 90°, etc. Correspondingly, according to the different angles between two adjacent grooves 2233, the number of grooves 2233 can be four, six, eight, etc. The present application does not limit the specific angle and number herein.

[0049] Please refer to Figure 6 、 Figure 7 , Figure 6 is Figure 4 the top view of the seal shown, Figure 7 is Figure 6 the cross-sectional view of the seal shown along A-A. In some embodiments, along the direction away from the bottom surface 221, the diameter of the cavity 223 gradually decreases. Specifically, the diameter of the opening 222 of the bottom surface 221 is the largest, and as the direction away from the bottom surface 221, the diameter of the cavity 223 gradually decreases, forming a frustum-shaped structure. The gradual decrease in the diameter of the cavity 223 along the direction away from the bottom surface 221 can make the bottom thickness of the seal 20 thinner, making it more convenient for the seal 20 to enter the through hole 11.

[0050] Specifically, taking the distance that the groove 2233 extends outward from the channel as the length of the groove 2233, since the diameter of the cavity 223 gradually decreases, as the diameter of the cavity 223 gradually decreases, the length of each groove 2233 increases, that is, the length of the groove 2233 at the end away from the bottom surface 221 is greater than the length of the groove 2233 at the end close to the bottom surface 221.

[0051] Please refer to Figures 8 - 10 , Figure 8 is Figure 4 the front view of the seal shown, Figure 9 is Figure 1 the front view of the end cap assembly shown Figure 1 , Figure 10 is Figure 9An enlarged schematic view of a partial B of the end cap assembly shown, specifically a schematic view of the cooperation between the seal and the end cap when the seal is partially inserted into the through hole. In some embodiments, along the direction away from the bottom surface 221, the diameter of the guiding portion 22 gradually increases. The guiding portion 22 as a whole forms a tapered structure that is narrower at the bottom and wider at the top. It can be understood that the diameter of the bottom of the guiding portion 22 is smaller, which can facilitate the guiding portion 22 to enter the through hole 11 with a diameter larger than that of the guiding portion 22. The tapered structure can play a good guiding role, reduce the frictional resistance during the assembly of the seal 20, improve the assembly efficiency and assembly accuracy of the seal 20, and avoid skewing during installation.

[0052] Please continue to refer to Figures 11 - 12 , Figure 11 is Figure 1 the front view of the end cap assembly shown Figure 2 , Figure 12 is Figure 11 An enlarged schematic view of a partial C of the end cap assembly shown, specifically a schematic view of the cooperation between the seal and the end cap after the seal is partially inserted into the through hole. In some embodiments, the guiding portion 22 includes a first outer surface 2251, and the sealing portion 21 includes a second outer surface 2110 adjacent to the first outer surface 2251. The included angle α between the first outer surface 2251 and the second outer surface 2110 is greater than 0° and less than or equal to 45°. Specifically, the second outer surface 2110 is parallel to the inner wall of the through hole 11, and the first outer surface 2251 is inclined and forms an included angle with the second outer surface 2110. It can be understood that the inclined first outer surface 2251 can facilitate the entry of the guiding portion 22. If the inclination angle is too large, the guiding portion 22 cannot enter; if the inclination angle is too small, the guiding effect is weak. As shown in the figure, the included angle between the first outer surface 2251 and the second outer surface 2110 is greater than 0° and less than or equal to 45°, such as the included angle between the first outer surface 2251 and the second outer surface 2110 can be 20°, 30°, 40°, 45°, etc.

[0053] In some embodiments, the sealing portion 21 includes a main body 211 and a protrusion 212. The protrusion 212 protrudes from the main body 211 and is annularly arranged around the main body 211. Specifically, the diameter of the protrusion 212 is greater than the diameter of the main body 211, that is, the cross-sectional area of the protrusion 212 is greater than the cross-sectional area of the main body 211, and the cross-sectional area of the main body 211 is greater than the cross-sectional area of the guiding portion 22. During the process of inserting the seal 20 into the through hole 11, the protrusion 212 will abut against the inner wall of the through hole 11 and be compressed and deformed, and compress into the cavity 223. As the insertion depth increases, the protrusion 212 will recover its deformation. The protrusion 212 can be a ring structure, and a second ring groove corresponding to the protrusion 212 can be provided on the inner wall of the through hole 11. The protrusion 212 cooperates with the second ring groove to improve the sealing effect of the sealing portion 21, and at the same time improve the sealing reliability between the seal 20 and the end cap assembly 100 to prevent electrolyte leakage.

[0054] Among them, the protrusion 212 can be arranged in the middle of the main body 211, or at one end of the main body 211 close to the guiding portion 22, or at one end of the main body 211 away from the guiding portion 22.

[0055] In some embodiments, the protrusion 212 and the main body 211 are of an integrally formed structure, and the integrally formed structure can enhance the connection stability between the main body 211 and the protrusion 212.

[0056] In some embodiments, the guiding portion 22 includes a connecting section 224 and a guiding section 225. The connecting section 224 is connected between the guiding section 225 and the connecting section 224. The connecting section 224 includes a connecting surface 2241, and the connecting surface 2241 is an arc-shaped structure. The arc-shaped structure enables the guiding portion 22 and the sealing portion 21 to be smoothly connected in a transitional manner. It can be understood that the smooth transitional structure can reduce the frictional resistance when the seal 20 enters, and prevent the seal 20 from extruding glue filaments when entering the through hole 11.

[0057] In some embodiments, the guiding section 225 includes a first outer surface 2251, and the sealing portion 21 includes a second outer surface 2110 close to the first outer surface 2251. The first outer surface 2251 is inclined towards the cavity 223 and forms a certain angle with the second outer surface 2110. The connecting section 224 is connected between the guiding section 225 and the second outer surface 2110 of the sealing portion 21. Since the diameter of the first outer surface 2251 gradually decreases in the inclined section, there will be a diameter difference with the sealing portion 21. Therefore, the connecting surface 2241 is an arc-shaped structure protruding towards the outside of the seal 20. One end of the connecting surface 2241 is smoothly connected to the second outer surface 2110, and the other end is smoothly connected to the first outer surface 2251.

[0058] In some embodiments, the guiding section 225 includes a first outer surface 2251, and the sealing portion 21 includes a second outer surface 2110 close to the first outer surface 2251. The sealing portion 21 includes a first stepped stage and a second stepped stage. The second stepped stage is a cylindrical structure with a diameter smaller than that of the main body 211. The first stepped stage is a tapered structure connected between the second stepped stage and the main body 211. The first stepped stage includes a first step surface 213, and the second stepped stage includes a second step surface 214. The second step surface 214 is parallel to the second outer surface 2110. The first step surface 213 is inclined and connected between the second step surface 214 and the second outer surface 2110. The first outer surface 2251 is inclined and forms a certain angle with the second outer surface 2110. The connecting section 224 is connected between the guiding section 225 and the second stepped stage. The connecting surface 2241 is an arc-shaped structure protruding towards the outside of the seal 20. One end of the connecting surface 2241 is smoothly connected to the second step surface 214, and the other end is smoothly connected to the first outer surface 2251.

[0059] In some embodiments, the guiding section 225 includes a first outer surface 2251, the sealing section 21 includes a second outer surface 2110 adjacent to the first outer surface 2251. The first outer surface 2251 has a straight structure. The connecting section 224 is connected between the guiding section 225 and the second outer surface 2110 of the sealing section 21. Since the guiding section 225 has a straight structure and the diameter of the sealing section 21 is larger than that of the guiding section 22, the connecting surface 2241 is an arc structure recessed inwardly toward the inside of the seal 20, and the connecting surface 2241 and the second outer surface 2110 are smoothly and transitionally connected.

[0060] In some embodiments, the sealing section 21 and the guiding section 22 are integrally formed structures. The integrally formed structure can enhance the structural stability of the sealing section 21 and the guiding section 22, and at the same time can simplify the installation process and improve production efficiency.

[0061] In some embodiments, the sealing section 21 and the guiding section 22 can be integrally formed by an injection molding process. Of course, they can also be made by other processes, and the manufacturing process of the seal 20 is not limited in this embodiment.

[0062] In some embodiments, the sealing section 21 and the guiding section 22 are separately formed structures. For example, the sealing section 21 and the guiding section 22 are non-detachably connected by means of bonding or the like.

[0063] Please refer to Figure 13 , Figure 13 which is a schematic structural diagram of a battery provided by an embodiment of the present invention. The present invention also provides a battery 200, including a housing 201, an electric core, and the end cover assembly 100 as described above. The inside of the housing 201 has a receiving cavity, the electric core is accommodated in the receiving cavity. One end of the housing 201 is provided with a chamber opening, and the end cover assembly 100 covers the chamber opening, and the first opening 222 faces the electric core. The housing 201 can be a square housing or a cylindrical housing, and the battery can be a square battery or a cylindrical battery, but the specific shapes of the housing and the battery are not limited in this application.

[0064] The present invention also provides a battery pack, including a battery box body and the battery 200 as described above. The batteries are arranged in the battery box body. By optimizing the structure of the seal 20 of the end cover 10, the installation efficiency of the end cover 10 can be improved, so that the seal 20 can better adapt to the equipment, and the assembly efficiency of the battery pack and the straight-through rate of each process transfer can be improved.

[0065] The above has introduced the embodiments of the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. An end cap assembly, characterized in that: include: An end cover having a through hole; A sealing member, the sealing member comprising a guide portion and a sealing portion connected to each other, the sealing portion being sealed and connected to the through hole, a cavity being provided in the guide portion, the guide portion comprising a bottom surface, the bottom surface being provided at an end of the guide portion away from the sealing portion, the bottom surface being provided with a first opening, the first opening being connected to the cavity, and the height of the cavity being greater than or equal to one quarter of the height of the sealing member; The diameter of the sealing part is larger than the diameter of the guide part, and the diameter of the sealing part is larger than the diameter of the through hole. The diameter of the bottom surface is smaller than the diameter of the through hole. When the sealing member enters the through hole, the guide part can elastically shrink toward the cavity.

2. The end cap assembly according to claim 1, characterized in that: The sealing member comprises a side wall surrounding the cavity, the side wall is provided with a groove communicating with the cavity, and the bottom surface is provided with a second opening communicating with the groove.

3. The end cap assembly according to claim 2, characterized in that: The side wall is provided with a plurality of grooves, and the plurality of grooves are evenly arranged around the cavity.

4. The end cap assembly according to any one of claims 1 to 3, characterized in that: The diameter of the cavity gradually decreases in a direction away from the bottom surface.

5. The end cap assembly according to any one of claims 1 to 3, characterized in that: The diameter of the guide portion gradually increases in a direction away from the bottom surface.

6. The end cap assembly according to claim 5, characterized in that: The guide portion includes a first outer surface, the sealing portion includes a second outer surface close to the first outer surface, and an angle between the first outer surface and the second outer surface is greater than 0° and less than or equal to 45°.

7. The end cap assembly according to any one of claims 1 to 3, characterized in that: The sealing part comprises a main body and a protrusion, wherein the protrusion is protruding from the main body and the protrusion is annularly arranged on the main body.

8. The end cap assembly according to any one of claims 1 to 3, characterized in that: The guide portion includes a connecting section and a guiding section, the connecting section is connected between the guiding section and the sealing portion, the connecting section includes a connecting surface, and the connecting surface is an arc-shaped structure.

9. The end cap assembly according to any one of claims 1 to 3, characterized in that: The sealing portion and the guiding portion are an integrally formed structure.

10. A battery, characterized in that: It comprises a shell, a battery cell and an end cover assembly as claimed in any one of claims 1 to 9, wherein the shell has a receiving cavity inside, the battery cell is received in the receiving cavity, the end cover assembly is covered on the shell, and the first opening faces the battery cell.

11. A battery pack, characterized in that: It comprises a battery box and the battery as claimed in claim 10, wherein the battery is arranged in the battery box.

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