End cover assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses an end cover assembly, a battery, a battery pack and electric equipment, the end cover assembly comprises: a cover plate, which is provided with a liquid injection hole; the sealing cover comprises a top cover and a first connecting part, the first connecting part is arranged at the end, facing the liquid injection hole, of the top cover, and the first connecting part is detachably connected with the peripheral wall of the liquid injection hole. According to the technical scheme provided by the invention, the first connecting part is detachably connected with the liquid injection hole, and the electrolyte can be supplemented twice or multiple times in the manufacturing process or the later use process of the battery cell, so that the service life of the battery cell can be prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to an end cap assembly, a battery, a battery pack, and an electrical device. Background Art

[0002] In the prior art, the liquid injection hole on the battery end cap is usually sealed by welding and gluing. After the liquid injection hole is closed, it is very difficult to open it again. Therefore, it is impossible to perform secondary electrolyte supplementation, which will result in a shorter service life of the battery cell. Utility Model Content

[0003] The purpose of the embodiments of this application is to provide an end cap assembly, a battery, a battery pack, and an electrical device.

[0004] According to the first aspect of the embodiments of this application, an end cap assembly is provided, including:

[0005] A cover plate, with a liquid injection hole formed thereon;

[0006] A sealing cover, which includes a top cover and a first connecting portion. The first connecting portion is provided at one end of the top cover facing the liquid injection hole, and the first connecting portion is detachably connected to the peripheral wall of the liquid injection hole.

[0007] Optionally, the end cap assembly further includes a sealing member located between the cover plate and the top cover.

[0008] Optionally, one end of the cover plate facing the sealing cover has a boss, and the liquid injection hole penetrates the cover plate at the boss.

[0009] The sealing cover further includes a second connecting portion, which is provided at one end of the top cover facing the liquid injection hole and is arranged circumferentially around the first connecting portion. The second connecting portion is detachably connected to the boss, the top cover abuts against the boss, and the sealing member is located between the top cover and the boss.

[0010] Optionally, a groove is formed at one end of the boss away from the cover plate, and the sealing member is received in the groove and abuts against the top cover.

[0011] Optionally, the groove is arranged circumferentially around the liquid injection hole, and the cross-section of the groove in the first direction is annular. The sealing member is an O-ring.

[0012] The outer diameter of the groove is the same as the outer diameter of the sealing member, and the inner diameter of the groove is larger than the inner diameter of the sealing member; or

[0013] The outer diameter of the groove is smaller than the outer diameter of the sealing member, and the inner diameter of the groove is the same as the inner diameter of the sealing member; or

[0014] The outer diameter of the groove is smaller than the outer diameter of the sealing element, and the inner diameter of the groove is larger than the inner diameter of the sealing element.

[0015] Optionally, the second connecting portion is cylindrical;

[0016] In the second direction, the length of the second connecting portion is the same as the length of the boss.

[0017] Optionally, the inner wall of the second connecting portion is threadedly connected to the outer wall of the boss.

[0018] Optionally, a first thread is formed on the inner wall of the second connecting portion, and a second thread is formed on the outer wall of the boss;

[0019] In the second direction, the length of the first thread is the same as the length of the second thread.

[0020] Optionally, one end of the second connection portion facing the cover plate is bonded to the cover plate.

[0021] Optionally, the outer wall of the first connecting portion is threadedly connected to the inner wall of the injection hole.

[0022] Optionally, the inner wall of the injection hole is provided with a third thread, and the outer wall of the first connecting portion is provided with a fourth thread;

[0023] In the second direction, the length of the third thread is greater than or equal to the length of the fourth thread.

[0024] Optionally, the end cover assembly further comprises a pole, wherein the pole is arranged at one end of the cover plate facing the top cover, and in the second direction, an end surface of the pole protrudes beyond an end surface of the top cover.

[0025] Optionally, a rotation groove is provided at one end of the top cover away from the liquid injection hole.

[0026] According to a second aspect of an embodiment of the present application, a battery is provided, comprising the above-mentioned end cover assembly.

[0027] According to a third aspect of an embodiment of the present application, a battery pack is provided, comprising:

[0028] The end cap assembly as described above; or

[0029] The battery mentioned above.

[0030] According to a fourth aspect of an embodiment of the present application, there is provided an electric device, including:

[0031] The end cap assembly as described above; or

[0032] any battery as mentioned above; or

[0033] The above-mentioned battery pack.

[0034] One technical effect of the embodiment of the present application is that the first connecting portion is detachably connected to the liquid injection hole. During the manufacturing process or in the later use process of the battery cell, the electrolyte can be replenished twice or multiple times, thereby improving the service life of the battery cell. Compared with the prior art in which the liquid injection hole is sealed by welding, this embodiment can also avoid the problem of poor airtightness caused by holes and air holes during the welding and sealing process. By means of threaded connection, there is no need to introduce welding equipment, which can simplify the manufacturing process and thus reduce the manufacturing cost.

[0035] Other features and advantages of the present application will become clear from the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present application and, together with the description thereof, serve to explain the principles of the present application.

[0037] Figure 1 is an exploded schematic view of the end cap assembly in the embodiment of the present application;

[0038] Figure 2 is a schematic structural view of the end cap assembly in the embodiment of the present application;

[0039] Figure 3 is a schematic structural view of the end cap assembly in the embodiment of the present application;

[0040] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0041] Figure 5 is Figure 4 a partial enlarged view of B in

[0042] Figure 6 is a schematic structural view of the sealing cover in the embodiment of the present application;

[0043] Figure 7 is a schematic structural view of the sealing member in the embodiment of the present application.

[0044] Description of the reference numerals: End cap assembly 100; Cover plate 11; Boss 12; Groove 121; Second thread 122; Liquid injection hole 13; Third thread 131; Sealing cover 2; Top cover 21; Rotating groove 211; First connecting portion 22; Fourth thread 221; Second connecting portion 23; First thread 231; Sealing member 3; Terminal post 4. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present application or its application or use.

[0047] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0048] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0050] First, it should be noted that for the first direction and the second direction mentioned in the embodiments of the present application, please refer to the directions marked in the attached Figure 3 drawings, and the first direction intersects with the second direction.

[0051] As Figures 1 - 7 shown, according to the first aspect of the embodiments of the present application, a end cap assembly 100 is provided, including a cover plate 11 and a sealing cover 2; a liquid injection hole 13 is formed in the cover plate 11; the sealing cover 2 includes a top cover 21 and a first connecting portion 22, the first connecting portion 22 is disposed at one end of the top cover 21 facing the liquid injection hole 13, and the first connecting portion 22 is detachably connected to the peripheral wall of the liquid injection hole 13.

[0052] In an embodiment of the present application, a end cap assembly 100 is provided, and the end cap assembly 100 is configured to be used for a battery.

[0053] As Figures 1 - 5 shown, the end cap assembly 100 includes a cover plate 11 and a sealing cover 2.

[0054] Among them, the cover plate 11 is an end cap of the battery housing, a liquid injection hole 13 is provided on the cover plate 11, the liquid injection hole 13 penetrates through the cover plate 11, and electrolyte is injected into the battery through the liquid injection hole 13. The sealing cover 2 includes a top cover 21 and a first connecting portion 22, the first connecting portion 22 is disposed at one end of the top cover 21 facing the liquid injection hole 13, and the first connecting portion 22 is detachably connected to the liquid injection hole 13, so that the liquid injection hole 13 can be closed by the sealing cover 2.

[0055] In an embodiment of the present application, the first connecting portion 22 is detachably connected to the liquid injection hole 13, and electrolyte can be replenished twice or multiple times during the manufacturing process of the battery cell and during the later use of the battery cell, thereby improving the service life of the battery cell; compared with the prior art in which the liquid injection hole 13 is sealed by welding, this embodiment can also avoid the problem of poor airtightness caused by holes and air pores during the welding and sealing process. By means of detachable connection, there is no need to introduce welding equipment, which can simplify the manufacturing process and thus reduce the manufacturing cost.

[0056] In a specific embodiment, the first connecting portion 22 and the liquid injection hole 13 can be connected by snap connection or threaded connection.

[0057] In a specific embodiment, as Figure 6 shown, the first connecting portion 22 is cylindrical, the first connecting portion 22 is connected to the top cover 21, and the outer wall of the first connecting portion 22 is detachably connected to the inner wall of the liquid injection hole 13. In this embodiment, the first connecting portion 22 is cylindrical, which can reduce the weight of the first connecting portion 22, and thus reduce the weight of the battery.

[0058] In another specific embodiment, the first connecting portion 22 is cylindrical, the first connecting portion 22 is connected to the top cover 21, and the outer wall of the first connecting portion 22 is detachably connected to the inner wall of the liquid injection hole 13. In this embodiment, the first connecting portion 22 is cylindrical, and the structural strength of the first connecting portion 22 is relatively high, thereby improving the connection stability between the first connecting portion 22 and the liquid injection hole 13.

[0059] In an alternative embodiment, the end cap assembly 100 further includes a seal 3, and the seal 3 is located between the cover plate 11 and the top cover 21.

[0060] The first connecting portion 22 is connected to the liquid injection hole 13, the top cover 21 abuts against the cover plate 11, and a seal 3 is provided between the top cover 21 and the cover plate 11, thereby sealing the gap between the top cover 21 and the cover plate 1, and further improving the sealing performance of the liquid injection hole 13. The sealing cover 2 and the liquid injection hole 13 are detachably connected to form a first sealing layer, and a seal 3 is provided between the top cover 21 and the cover plate 11. The seal 3 can seal the gap between the top cover 21 and the cover plate 11 to form a second sealing layer, thereby improving the sealing performance of the liquid injection hole 13 to prevent electrolyte leakage.

[0061] In a specific embodiment, the cover plate 11 is in the shape of a plate. A liquid injection hole 13 is formed in the cover plate 11. The first connecting portion 22 is detachably connected to the liquid injection hole 13. The top cover 21 abuts against the cover plate 11, and a seal 3 is provided between the top cover 21 and the cover plate 11. The gap between the top cover 21 and the cover plate 11 is sealed by the seal 3 to improve the sealing performance between the sealing cover 2 and the liquid injection hole 13.

[0062] In another specific embodiment, one end of the cover plate 11 facing the sealing cover 2 has a boss 12, and the liquid injection hole 13 penetrates through the cover plate 11 at the boss 12; the sealing cover 2 further includes a second connecting portion 23, the second connecting portion 23 is provided at one end of the top cover 21 facing the liquid injection hole 13, and is disposed around the first connecting portion 22. The second connecting portion 23 is detachably connected to the boss 12. The top cover 21 abuts against the boss 12 and the seal 3 is located between the top cover 21 and the boss 12.

[0063] As Figure 4 and Figure 5 shown, a boss 12 is provided on the end face of the cover plate 11 facing the sealing cover 2. The liquid injection hole 13 is formed in the boss 12 and penetrates through the cover plate 11 at the boss 12, that is, it penetrates from one end of the boss 12 away from the cover plate 11 to the end of the cover plate 11 away from the sealing cover 2; the sealing cover 2 further includes a second connecting portion 23. The second connecting portion 23 is provided at one end of the top cover 21 facing the liquid injection hole 13. The second connecting portion 23 is disposed around the first connecting portion 22. The second connecting portion 23 is detachably connected to the boss 12. The first connecting portion 22 is detachably connected to the liquid injection hole 13; the top cover 21 abuts against the boss 12, and the seal 3 is located between the top cover 21 and the boss 12, thereby sealing the gap between the top cover 21 and the boss 12 to improve the sealing performance of the liquid injection hole 13.

[0064] In the embodiment of the present application, the second connecting portion 23 and the boss 12 are connected to form a third sealing layer, which can further improve the sealing performance of the liquid injection hole 13 to prevent electrolyte leakage, thereby improving the electrical safety.

[0065] Among them, the cover plate 11 and the boss 12 can be integrally formed by casting; the boss 12 can also be machined on the cover plate 11; the cover plate 11 and the boss 12 can also be connected together by welding.

[0066] In an alternative embodiment, a groove 121 is formed at one end of the boss 12 away from the cover plate 11, and the seal 3 is received in the groove 121 and abuts against the top cover 21.

[0067] As Figure 2 and Figure 5As shown, a groove 121 is provided at one end of the boss 12 away from the cover plate 11. The groove 121 is arranged circumferentially around the liquid injection hole 13. The seal 3 is received in the groove 121 and, in the second direction, the seal 3 abuts against the top cover 21. On the one hand, the seal 3 being received in the groove 121 can provide an installation space for the seal 3, facilitating the installation of the seal 3 and also restricting the movement of the seal 3. On the other hand, the seal 3 abutting against the top cover 21 can improve the sealing effect between the top cover 21 and the cover plate 11, thereby further enhancing the sealing performance of the liquid injection hole 13.

[0068] In an alternative embodiment, the groove 121 is provided circumferentially around the liquid injection hole 13. The cross-section of the groove 121 in the first direction is annular, and the seal 3 is an O-ring.

[0069] The outer diameter of the groove 121 is the same as the outer diameter of the seal 3, and the inner diameter of the groove 121 is greater than the inner diameter of the seal 3; or

[0070] The outer diameter of the groove 121 is less than the outer diameter of the seal 3, and the inner diameter of the groove 121 is the same as the inner diameter of the seal 3; or

[0071] The outer diameter of the groove 121 is less than the outer diameter of the seal 3, and the inner diameter of the groove 121 is greater than the inner diameter of the seal 3.

[0072] As Figure 2 shown, the groove 121 is provided circumferentially around the liquid injection hole 13. In the first direction, the cross-section of the groove 121 is annular; the seal 3 is an O-ring, so that the seal 3 can be placed in the groove 121.

[0073] Among them, the outer diameter of the groove 121 refers to the distance from the center of the boss 12 to the outer edge of the groove 121; the inner diameter of the groove 121 refers to the distance from the center of the boss 12 to the inner edge of the groove 121; as Figure 7 shown, the outer diameter of the seal 3 refers to the distance from the center of the seal 3 to the outer edge of the seal 3; the inner diameter of the seal 3 refers to the distance from the center of the seal 3 to the inner edge of the seal 3.

[0074] In a specific embodiment, the outer diameter of the groove 121 is the same as the outer diameter of the seal 3, and the inner diameter of the groove 121 is greater than the inner diameter of the seal 3.

[0075] In another specific embodiment, the outer diameter of the groove 121 is less than the outer diameter of the seal 3, and the inner diameter of the groove 121 is the same as the inner diameter of the seal 3.

[0076] In another specific embodiment, the outer diameter of the groove 121 is smaller than the outer diameter of the seal 3, and the inner diameter of the groove 121 is larger than the inner diameter of the seal 3.

[0077] In the above embodiment, the material of the seal 3 is made of compressible rubber. On the premise that the seal 3 can be embedded in the groove 121, the volume of the groove 121 is smaller than the volume of the seal 3, which can prevent the seal 3 from shifting, thereby ensuring its sealing effect.

[0078] In an alternative embodiment, the second connecting portion 23 is cylindrical; in the second direction, the length of the second connecting portion 23 is the same as the length of the boss 12.

[0079] As Figure 5 and Figure 6 shown, the second connecting portion 23 is cylindrical, and the second connecting portion 23 is connected to the top cover 21; in the second direction, the second connecting portion 23 protrudes towards the cover plate 11, and the boss 12 protrudes towards the sealing cover 2. The length of the second connecting portion 23 is the same as the length of the boss 12. When the second connecting portion 23 is connected to the boss 12, the top cover 21 and the boss 12 can act together to press the seal 3 to seal the gap between the top cover 21 and the boss 12.

[0080] In an alternative embodiment, the inner wall of the second connecting portion 23 is threadedly connected to the outer wall of the boss 12. Using threaded connection, it is convenient to install and has high connection stability.

[0081] In an alternative embodiment, a first thread 231 is provided on the inner wall of the second connecting portion 23, and a second thread 122 is provided on the outer wall of the boss 12; in the second direction, the length of the first thread 231 is the same as the length of the second thread 122.

[0082] As Figure 5 and Figure 6 shown, in the embodiment where the second connecting portion 23 is cylindrical, a first thread 231 is formed on the inner wall of the second connecting portion 23, and a second thread 122 is formed on the outer wall of the boss 12.

[0083] Among them, the diameter, pitch and thread angle of the first thread 231 match the diameter, pitch and thread angle of the second thread 122, so that the first thread 231 and the second thread 122 can be screwed together.

[0084] In a specific embodiment, the first thread 231 extends from one end of the inner wall of the second connecting portion 23 near the top cover 21 towards the other end away from the top cover 21, and the second thread 122 extends from one end of the outer wall of the boss 12 away from the cover plate 11 towards the end close to the cover plate 11; in another specific embodiment, the first thread 231 extends from one end of the inner wall of the second connecting portion 23 away from the top cover 21 towards the end close to the top cover 21, and the second thread 122 extends from one end of the outer wall of the boss 12 close to the cover plate 11 towards the end away from the cover plate 11. In the second direction, the lengths of the first thread 231 and the second thread 122 are the same. When the first thread 231 of the second connecting portion 23 is screwed together with the second thread 122 on the boss 12, the top cover 21 can be made to abut against the boss 12.

[0085] In an alternative embodiment, one end of the second connecting portion 23 facing the cover plate 11 is bonded to the cover plate 11.

[0086] In an embodiment where the second connecting portion 23 is cylindrical, one end of the second connecting portion 23 facing the cover plate 11, that is, the bottom end of the second connecting portion 23, is bonded to the cover plate 11 through glue. This can not only improve the connection stability between the sealing cover 2 and the cover plate 11, but also improve the sealing effect between the sealing cover 2 and the cover plate 11, thereby further improving the sealing performance of the liquid injection hole 13.

[0087] In an alternative embodiment, the outer wall of the first connecting portion 22 is threadedly connected to the inner wall of the liquid injection hole 13. Threaded connection is convenient for installation and has relatively high connection stability.

[0088] In an alternative embodiment, a third thread 131 is provided on the inner wall of the liquid injection hole 13, and a fourth thread 221 is provided on the outer wall of the first connecting portion 22; in the second direction, the length of the third thread 131 is greater than or equal to the length of the fourth thread 221.

[0089] As Figure 5 and Figure 6 shown, a third thread 131 is formed on the inner wall of the liquid injection hole 13, and a fourth thread 221 is formed on the outer wall of the first connecting portion 22.

[0090] Among them, the diameter, pitch, and thread angle of the third thread 131 match those of the fourth thread 221 so that the third thread 131 and the fourth thread 221 can be screwed together.

[0091] In a specific embodiment, the third thread 131 extends from one end of the inner wall of the liquid injection hole 13 close to the sealing cover 2 towards the end away from the sealing cover 2, and the fourth thread 221 extends from one end of the outer wall of the first connecting portion 22 close to the top cover 21 towards the end away from the top cover 21. In the second direction, the length of the third thread 131 is greater than or equal to the length of the fourth thread 221, so that the connection stability between the first connecting portion 22 and the liquid injection hole 13 can be higher.

[0092] In a specific embodiment, the length of the third thread 131 is less than the axial length of the liquid injection hole 13.

[0093] In an alternative embodiment, the end cap assembly 100 further includes a pole post 4, and the pole post 4 is disposed at one end of the cover plate 11 facing the top cover 21. In the second direction, the end face of the pole post 4 protrudes from the end face of the top cover 21.

[0094] The end cap assembly 100 further includes a pole post 4, and the pole post 4 is disposed at one end of the cover plate 11 facing the top cover 21. Specifically, the pole post 4 is disposed at one end of the cover plate 11 facing the top cover 21. In the second direction, the end face of the pole post 4 away from the cover plate 11 is not flush with the end face of the top cover 21 away from the cover plate 11, and the pole post 4 is higher than the top cover 21. Since the pole post 4 is externally connected to a connecting member, and the pole post 4 is higher than the top cover 21, it is convenient for the pole post 4 to be connected to the connecting member and will not be affected by the top cover 21.

[0095] In an alternative embodiment, a rotation groove 211 is provided at one end of the top cover 21 facing away from the liquid injection hole 13.

[0096] As Figure 5 shown, a rotation groove 211 is provided at one end of the top cover 21 facing away from the liquid injection hole 13, and an external rotation mechanism engages with the rotation groove 211, so as to screw the sealing cover 2 and the cover plate 11 together by threads.

[0097] In a preferred embodiment, a plurality of rotation grooves 211 are provided, and the plurality of rotation grooves 211 are arranged at intervals along the circumferential direction of the sealing cover 2.

[0098] According to the second aspect of the embodiments of the present application, a battery is provided, including the above-mentioned end cap assembly 100.

[0099] The end cap assembly 100 of the embodiments of the present application is applicable to various battery cells.

[0100] The battery may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of the present disclosure do not limit this. The battery may be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of the present application do not limit this.

[0101] According to the third aspect of the embodiments of the present application, a battery pack is provided, including the above-mentioned end cover assembly 100; or the above-mentioned battery.

[0102] The battery cells of the embodiments of the present application are applicable to various types of battery packs.

[0103] The battery pack can be used for power supply of electrical equipment such as vehicles, for example, providing power for vehicle control or driving power.

[0104] According to the fourth aspect of the embodiments of the present application, an electrical equipment is provided, including the above-mentioned end cover assembly 100; or the above-mentioned battery; or the above-mentioned battery pack.

[0105] The battery pack of the embodiments of the present application is applicable to various electrical equipment using batteries.

[0106] The electrical equipment can be battery-powered vehicles, electric vehicles, ships, spacecrafts, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment.

[0107] Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An end cap assembly, characterized in that: include: A cover plate, wherein the cover plate is provided with a liquid injection hole; The sealing cover comprises a top cover and a first connecting portion, wherein the first connecting portion is arranged at one end of the top cover facing the liquid injection hole, and the first connecting portion is detachably connected to the peripheral wall of the liquid injection hole.

2. The end cap assembly according to claim 1, characterized in that: The end cap assembly further includes a seal located between the cover plate and the top cap.

3. The end cap assembly according to claim 2, characterized in that: The cover plate has a boss at one end facing the sealing cover, and the injection hole penetrates the cover plate at the boss; The sealing cover also includes a second connecting portion, which is arranged at one end of the top cover facing the injection hole and is arranged in a ring around the first connecting portion. The second connecting portion is detachably connected to the boss, the top cover is abutted against the boss and the sealing member is located between the top cover and the boss.

4. The end cap assembly according to claim 3, characterized in that: A groove is formed at one end of the boss away from the cover plate, and the sealing member is accommodated in the groove and abuts against the top cover.

5. The end cap assembly according to claim 4, characterized in that: The groove is arranged around the injection hole, the cross section of the groove in the first direction is annular, and the sealing member is a sealing ring; The outer diameter of the groove is the same as the outer diameter of the seal, and the inner diameter of the groove is larger than the inner diameter of the seal; or The outer diameter of the groove is smaller than the outer diameter of the seal, and the inner diameter of the groove is the same as the inner diameter of the seal; or The outer diameter of the groove is smaller than the outer diameter of the sealing element, and the inner diameter of the groove is larger than the inner diameter of the sealing element.

6. The end cap assembly according to claim 3, characterized in that: The second connecting portion is cylindrical; In the second direction, the length of the second connecting portion is the same as the length of the boss.

7. The end cap assembly according to claim 3, characterized in that: The inner wall of the second connecting portion is threadedly connected to the outer wall of the boss.

8. The end cap assembly according to claim 7, characterized in that: The inner wall of the second connecting portion is provided with a first thread, and the outer wall of the boss is provided with a second thread; In the second direction, the length of the first thread is the same as the length of the second thread.

9. The end cap assembly according to claim 3, characterized in that: One end of the second connection portion facing the cover plate is bonded to the cover plate.

10. The end cap assembly according to claim 1, characterized in that: The outer wall of the first connecting portion is threadedly connected to the inner wall of the injection hole.

11. The end cap assembly according to claim 10, characterized in that: The inner wall of the injection hole is provided with a third thread, and the outer wall of the first connecting portion is provided with a fourth thread; In the second direction, the length of the third thread is greater than or equal to the length of the fourth thread.

12. The end cap assembly according to claim 1, wherein: The end cover assembly further includes a pole, which is arranged at one end of the cover plate facing the top cover, and in the second direction, an end surface of the pole protrudes from an end surface of the top cover.

13. The end cap assembly according to claim 1, wherein: A rotation groove is provided at one end of the top cover away from the liquid injection hole.

14. A battery, characterized in that: Comprising the end cover assembly according to any one of claims 1-13.

15. A battery pack, characterized in that: include: The end cap assembly according to any one of claims 1 to 13; or The battery of claim 14.

16. An electrical equipment, characterized in that: include: The end cap assembly according to any one of claims 1 to 13; or The battery as claimed in claim 14; or The battery pack as claimed in claim 15.

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