EP-4742390-A1 - END CAP ASSEMBLY, ENERGY STORAGE APPARATUS AND ELECTRIC DEVICE

Abstract

An end cover assembly (4), an energy-storage apparatus (3), and an electricity-consumption device (2) are provided. The end cover assembly (4) includes a top cover (41), an upper plastic member (42), a terminal post (43), and a sealing member (44). The upper plastic member (42) includes a body (421), a first protruding ring (422), and a second protruding ring (423). The body (421) is disposed on a first surface (411). The first protruding ring (422) is disposed on a side of the body (421) facing the first surface (411). The second protruding ring (423) is disposed on a side of the first protruding ring (422) facing away from the body (421). The second protruding ring (423) abuts against a surface of the sealing member (44) facing the upper plastic member (42), to cause a surface of the sealing member (44) facing away from a hole wall of an assembly hole (413) to abut against a peripheral side surface of the terminal post (43), thereby improving the sealing performance of the sealing member (44).

Inventors

• LI, MAOSONG
• TAN, Jiben

Assignees

• Shenzhen Hithium Energy Storage Technology Co., Ltd.
• Xiamen Hithium Energy Storage Technology Co., Ltd.

Dates

Publication Date

20260513

Application Date

20230712

Claims (16)

1. An end cover assembly, comprising: a top cover having a first surface and a second surface opposite to the first surface, wherein an assembly hole is defined in the top cover, and the assembly hole penetrates through the first surface and the second surface; an upper plastic member comprising a body, a first protruding ring, and a second protruding ring, wherein the body is disposed on the first surface, the first protruding ring is disposed on a side of the body facing the first surface and located in the assembly hole, the second protruding ring is disposed on a side of the first protruding ring facing away from the body and located in the assembly hole, a distance from an inner sidewall surface of the first protruding ring to a hole wall of the assembly hole is greater than a distance from an inner sidewall surface of the second protruding ring to the hole wall of the assembly hole, and the body, the first protruding ring, and the second protruding ring cooperatively define a through hole; a terminal post passing through the assembly hole and the through hole; and a sealing member sleeved on a periphery of the terminal post and located in the assembly hole; wherein a surface of the second protruding ring facing away from the first protruding ring abuts against a surface of the sealing member facing the upper plastic member, to cause a surface of the sealing member facing away from the hole wall of the assembly hole to abut against the peripheral side surface of the terminal post.
2. The end cover assembly according to claim 1, wherein the first protruding ring has a third surface facing the second protruding ring, and the sealing member abuts against the third surface located between the second protruding ring and the terminal post.
3. The end cover assembly according to claim 1, wherein a surface of the second protruding ring closer to the hole wall of the assembly hole is flush with a surface of the first protruding ring closer to the hole wall of the assembly hole.
4. The end cover assembly according to claim 1, wherein a surface of the second protruding ring facing away from the first protruding ring is closer to the first surface than the second surface.
5. The end cover assembly according to claim 1, wherein the upper plastic member satisfies at least one of the following conditions: a surface junction between the second protruding ring and the first protruding ring has an arc chamfer; or the second protruding ring has a top surface facing away from the first protruding ring and a side surface connected to the top surface in a bending manner, wherein the side surface is further connected to the first protruding ring, and a junction between the top surface and the side surface has an arc chamfer.
6. The end cover assembly according to claim 1, wherein a height H 1 from a surface of the second protruding ring facing away from the body to a surface of the first protruding ring facing away from the body satisfies: 0.20mm ≤ H 1 ≤ 0.30mm.
7. The end cover assembly according to claim 1, wherein the end cover assembly further comprises a riveting member mounted to a side of the body facing away from the first protruding ring, wherein the riveting member is sleeved on and connected to the terminal post, and an orthographic projection of the riveting member on the body facing the first surface covers both an orthographic projection of the first protruding ring on the body facing the first surface and an orthographic projection of the second protruding ring on the body facing the first surface.
8. The end cover assembly according to claim 1, wherein an annular recess is defined on a surface of the sealing member facing the upper plastic member, wherein the annular recess is arranged in a circumferential direction of the second protruding ring, and is configured to accommodate at least a portion of the second protruding ring.
9. The end cover assembly according to claim 8, wherein in an arrangement direction from the upper plastic member to the top cover, a recess sidewall of the annular recess is inclined toward a central axis of the annular recess.
10. The end cover assembly according to claim 8, wherein the sealing member satisfies at least one of the following conditions: the annular recess has a recess bottom surface and a recess side surface connected to the recess bottom surface in a bending manner, and a junction between the recess bottom surface and the recess side surface has an arc chamfer; or a junction between the recess side surface of the annular recess and the surface of the sealing member facing the upper plastic member has an arc chamfer.
11. The end cover assembly according to claim 8, wherein a recess depth of the annular recess is less than a height from a surface of the second protruding ring facing away from the body to a surface of the first protruding ring facing away from the body.
12. The end cover assembly according to claim 8, wherein a recess depth H 2 of the annular recess satisfies: 0.10mm ≤ H2 ≤ 0.20mm.
13. The end cover assembly according to any one of claims 1 to 12, wherein the terminal post comprises a flange portion and a post-body portion protruding from the flange portion, wherein the post-body portion passes through the assembly hole and the through hole, the flange portion is located on a side of the second surface; the sealing member comprises a first part and a second part connected to each other, wherein the first part abuts against both the second surface and a surface of the flange portion facing the top cover, the second part is closer to the post-body portion than the first part, and the second part abuts against the second protruding ring and abuts against a peripheral side surface of the post-body portion.
14. The end cover assembly according to claim 13, wherein an annular recess is defined on a surface of the second part facing the upper plastic member, wherein the annular recess is arranged in a circumferential direction of the second protruding ring, and is configured to accommodate at least a portion of the second protruding ring.
15. An energy-storage apparatus, comprising an electrode assembly, a housing, and the end cover assembly according to any one of claims 1 to 14, wherein the electrode assembly is disposed in the housing, and the end cover assembly is electrically connected to the electrode assembly.
16. An electricity-consumption device, comprising: a device body; and the energy-storage apparatus according to claim 15, wherein the energy-storage apparatus is configured to supply power to the device body.

Description

TECHNICAL FIELD The present disclosure relates to the field of energy-storage apparatus technology, and in particular, to an end cover assembly, an energy-storage apparatus, and an electricity-consumption device. BACKGROUND In the related art, an upper plastic member is formed by injection molding, and then a top cover, a terminal post, a sealing member, and the upper plastic member are assembled to obtain an assembled end cover assembly. However, since the injection-molded upper plastic member requires cooling, the end cover assembly requires a relatively long time in assembly, resulting in low assembly efficiency. In the disclosure, a riveting process is used to connect a riveting member to a terminal post, thereby achieving fixation of the top cover, the terminal post, the sealing member, and the upper plastic member, so as to obtain an assembled end cover assembly. This assembly method can reduce assembly time and improve assembly efficiency. However, in the riveting process, the sealing member is susceptible to compression, causing deformation of the sealing member. This could reduce the performance of connection between the sealing member and the terminal post and degrade the sealing performance of the sealing member, which in turn increases the likelihood of liquid leakage in an energy-storage apparatus. SUMMARY In view of this, the disclosure provides an end cover assembly, an energy-storage apparatus, and an electricity-consumption device. A second protruding ring of an upper plastic member can abut against a surface of a sealing member facing the upper plastic member, to cause the sealing member to abut against a peripheral side surface of a terminal post, thereby improving the sealing performance of the sealing member. In a first aspect of the disclosure, an end cover assembly is provided. The end cover assembly includes a top cover, an upper plastic member, a terminal post, and a sealing member. The top cover has a first surface and a second surface opposite to the first surface. An assembly hole is defined in the top cover, and the assembly hole penetrates through the first surface and the second surface. The upper plastic member includes a body, a first protruding ring, and a second protruding ring. The body is disposed on the first surface. The first protruding ring is disposed on a side of the body facing the first surface and located in the assembly hole. The second protruding ring is disposed on a side of the first protruding ring facing away from the body and located in the assembly hole. A distance from an inner sidewall surface of the first protruding ring to a hole wall of the assembly hole is greater than a distance from an inner sidewall surface of the second protruding ring to the hole wall of the assembly hole. The body, the first protruding ring, and the second protruding ring cooperatively define a through hole. The terminal post passes through the assembly hole and the through hole. The sealing member is sleeved on a periphery of the terminal post and located in the assembly hole. A surface of the second protruding ring facing away from the first protruding ring abuts against a surface of the sealing member facing the upper plastic member, to cause a surface of the sealing member facing away from the hole wall of the assembly hole to abut against the peripheral side surface of the terminal post. The end cover assembly provided in the first aspect of the disclosure includes the top cover, the upper plastic member, the terminal post, and the sealing member. The second protruding ring of the upper plastic member abuts against the surface of the sealing member facing the upper plastic member, to cause the surface of the sealing member facing away from the hole wall of the assembly hole to abut against the peripheral side surface of the terminal post. It may be understood as that the second protruding ring can compress the sealing member in an axial direction of the terminal post, applying a compressive force to the sealing member in the axial direction of the terminal post, so that the sealing member deforms in a radial direction of the terminal post to abut against and seal the peripheral side surface of the terminal post. In other words, the second protruding ring compresses the sealing member in an axial direction of the sealing member, causing the sealing member to be compressed and deformed, and to extend outward in a radial direction of the sealing member to abut against and seal the peripheral side surface of the terminal post. Furthermore, the distance from the inner sidewall surface of the first protruding ring to the hole wall of the assembly hole is greater than the distance from the inner sidewall surface of the second protruding ring to the hole wall of the assembly hole. Therefore, there is a gap between the terminal post and the second protruding ring located in the assembly hole. When the second protruding ring compresses the sealing member, at least a portion of the