Cover plate structure and battery

Abstract

A cover plate structure, comprising posts (1), a cover plate (2) and insulating parts (3). The posts (1) each partially pass through a through hole at an insulating part (3) and the cover plate (2); each insulating part (3) is partially arranged between a post (1) and the cover plate (2), so that the post (1) and the inner wall of a through hole of the cover plate (2) are spaced apart from each other; the surface of each insulating part (3) in contact with the cover plate (2) is provided with a groove around a post (1); the surface of the cover plate (2) in contact with the insulating parts (3) is provided with annular bulges, the bulges being inserted into the grooves in the circumferential direction.

Description

Cover structure and battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 25, 2023, with application number 202323532640.0, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, for example, to a cover plate structure and a battery. Background Art

[0003] In related technologies, the battery cover structure requires insulation treatment of the pole and the metal cover. Generally, an insulating part is provided to separate the pole and the cover. However, if the electrolyte enters the gap between the insulating part and the cover to form crystals, and the crystals fall into the space between the pole and the cover, micro-conduction will be formed between the pole and the cover, affecting the quality of the battery.

[0004] Summary of the Invention

[0005] The present application provides a cover plate structure that can prevent the electrolyte from entering the gap between the insulating part and the cover plate to form crystals, thereby avoiding micro-conduction between the pole and the cover plate caused by crystallization and ensuring the quality of the battery.

[0006] The present application provides a cover plate structure, comprising a pole, a cover plate and an insulating member, wherein the pole portion is inserted through the through holes of the insulating member and the cover plate, and the insulating member portion is arranged between the pole and the cover plate so that the pole and the inner wall of the through hole of the cover plate are spaced apart, a groove is provided around the pole on the surface of the insulating member in contact with the cover plate, and a protrusion is provided on the surface of the cover plate in contact with the insulating member, and the protrusion is circumferentially inserted into the groove.

[0007] In some embodiments, the protrusion includes a first protrusion and a second protrusion that are spaced apart, and the groove includes a first groove and a second groove. The first protrusion is circumferentially inserted in the first groove, and the second protrusion is circumferentially inserted in the second groove.

[0008] In some embodiments, the height of the first protrusion is consistent with the height of the second protrusion.

[0009] In some embodiments, the first protrusion abuts against the bottom of the first groove, and the second protrusion abuts against the bottom of the second groove.

[0010] In some embodiments, the cover plate structure further includes a first sealing ring, which is sandwiched between the first protrusion and the bottom of the first groove;

[0011] And / or, the cover plate structure further includes a second sealing ring, which is sandwiched between the second protrusion and the bottom of the second groove.

[0012] In some embodiments, the cover plate structure further includes a third sealing ring, which is sleeved on the pole and abuts between the pole, the insulating member, and the cover plate.

[0013] In some embodiments, the cover plate structure further includes a lower plastic, the pole portion is passed through a through hole of the lower plastic, and the lower plastic portion abuts between the pole and the cover plate.

[0014] In some embodiments, a third protrusion is provided on the outer side surface of the end portion of the pole close to the cover plate, and the surface of the third protrusion close to the cover plate abuts against both the lower plastic and the third sealing ring.

[0015] In some embodiments, the outer side of the insulating member is provided with a first frustum surface, the inner wall of the through hole of the cover plate is provided with a second frustum surface, and the first frustum surface and the second frustum surface are configured to form a surface seal fit.

[0016] The present application also provides a battery that can prevent the electrolyte from entering the gap between the insulating part and the cover plate to form crystals, thereby avoiding micro-conduction between the pole and the cover plate caused by crystallization and ensuring the quality of the battery.

[0017] The present application also provides a battery, comprising a shell and the above-mentioned cover structure, wherein the cover structure is arranged at the opening of the shell to form a sealed inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of a cover plate structure provided in an embodiment of the present application;

[0019] FIG2 is a partial cross-sectional view of a cover plate structure provided in an embodiment of the present application;

[0020] FIG3 is another partial cross-sectional view of the cover plate structure provided in an embodiment of the present application;

[0021] FIG4 is a schematic structural diagram of a battery provided in an embodiment of the present application.

[0022] In the figure: 1. Pole; 11. Third protrusion; 2. Cover; 21. First protrusion; 22. Second protrusion; 23. Second conical surface; 3. Insulator; 31. First conical surface; 32. First groove; 33. Second groove; 4. First sealing ring; 5. Second sealing ring; 6. Third sealing ring; 7. Lower plastic; 8. Housing; 9. Battery cell. DETAILED DESCRIPTION

[0023] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0025] As shown in Figures 1-3, the cover plate structure of this embodiment includes a pole 1, a cover plate 2, and an insulating member 3. The pole 1 is partially inserted through the through-holes of the insulating member 3 and the cover plate 2, and the insulating member 3 is partially arranged between the pole 1 and the cover plate 2, so that the pole 1 and the inner wall of the through-hole of the cover plate 2 are spaced apart. The insulating member 3 has a groove surrounding the pole 1 on the surface facing the battery cell, and a protrusion is circumferentially inserted into the groove on the surface facing away from the battery cell. In other words, the surface of the insulating member 3 in contact with the cover plate 2 has a groove surrounding the pole 1, and the surface of the cover plate 2 in contact with the insulating member 3 has a protrusion circumferentially inserted into the groove.

[0026] Since the protrusion on the cover plate 2 is higher than other parts of the cover plate 2, the protrusion can block the electrolyte from entering between the cover plate 2 and the insulating member 3, thereby preventing the electrolyte from crystallizing and forming a micro-conductivity between the pole 1 and the cover plate 2, thereby ensuring the quality of the battery.

[0027] Optionally, the protrusions include a first protrusion 21 and a second protrusion 22 spaced apart, and the grooves include a first groove 32 and a second groove 33. The first protrusion 21 is circumferentially inserted into the first groove 32, and the second protrusion 22 is circumferentially inserted into the second groove 33. The two protrusions arranged circumferentially on the cover plate 2 can enhance the electrolyte barrier effect, significantly reducing the likelihood that electrolyte that has seeped through the first protrusion 21 will then seep through the second protrusion 22. Furthermore, the first protrusion 21, located closer to the pole 1, prevents internal electrolyte from seeping into the space between the insulating member 3 and the cover plate 2, while the second protrusion 22, located farther away from the pole 1, prevents external electrolyte from dripping and seeping into the space between the insulating member 3 and the cover plate 2.

[0028] Optionally, in this embodiment, the height of the first protrusion 21 is consistent with the height of the second protrusion 22 to simplify the manufacturing process of the insulating member 3 and the cover plate 2. In other embodiments, the heights of the first protrusion 21 and the second protrusion 22 may also be set to be different.

[0029] Optionally, the first protrusion 21 abuts against the bottom of the first groove 32, and the second protrusion 22 abuts against the bottom of the second groove 33, so as to improve the sealing effect of the contact position between the protrusion and the groove, thereby improving the effect of preventing electrolyte leakage.

[0030] To improve the sealing between the protrusion and the groove, the cover plate structure optionally further includes a first sealing ring 4, which is sandwiched between the first protrusion 21 and the bottom of the first groove 32. Optionally, the cover plate structure further includes a second sealing ring 5, which is sandwiched between the second protrusion 22 and the bottom of the second groove 33.

[0031] Optionally, in this embodiment, the protrusions and grooves are both closed rings. In other embodiments, the protrusions and grooves can be arranged in multiple intervals in sequence, with multiple protrusions arranged to form a ring, and multiple grooves arranged to form a ring, with multiple protrusions and multiple grooves arranged in a one-to-one correspondence.

[0032] Optionally, in this embodiment, the first protrusion 21, the second protrusion 22, the first groove 32, and the second groove 33 are all circular. In other embodiments, they may also be set to other polygonal ring shapes or other irregular ring shapes.

[0033] Optionally, the cover structure also includes a third sealing ring 6, which is sleeved on the pole 1. The surface of the third sealing ring 6 facing away from the battery cell abuts against both the insulating member 3 and the cover 2, that is, the third sealing ring 6 abuts between the pole 1 and the insulating member 3 and the cover 2. The third sealing ring 6 can fix the distance between the inner wall of the through hole of the cover 2 and the outer wall of the pole 1.

[0034] Optionally, the cover structure further includes a lower plastic 7, with the pole 1 partially inserted through a through-hole in the lower plastic 7. The lower plastic 7 is attached to the surface of the cover 2 facing the battery cell to prevent the cover 2 from contacting the positive or negative tabs in the battery. In some embodiments, the lower plastic 7 may partially abut between the pole 1 and the cover 2.

[0035] Optionally, a third protrusion 11 is provided on the outer side surface of the end of the pole 1 close to the battery cell, and the surface of the third protrusion 11 facing away from the battery cell abuts against both the lower plastic 7 and the third sealing ring 6, that is, a third protrusion 11 is provided on the outer side surface of the end of the pole 1 close to the cover plate 2, and the surface of the third protrusion 11 close to the cover plate 2 abuts against both the lower plastic 7 and the third sealing ring 6, so as to fix the position of the cover plate 2, the third sealing ring 6 and the lower plastic 7 relative to the pole 1 in the axial direction to prevent the insulation component from being dislocated and the insulation from failing.

[0036] Optionally, a first conical surface 31 is provided on the outer ring of the insulating part 3, and a second conical surface 23 is provided on the inner wall ring of the through hole of the cover plate 2. The first conical surface 31 and the second conical surface 23 are sealed together to improve the sealing between the two and prevent the internal electrolyte from leaking into between the cover plate 2 and the insulating part 3.

[0037] Optionally, the insulating member 3 is made of plastic to ensure insulation performance.

[0038] Figure 4 is a schematic diagram of the structure of a battery provided in an embodiment of the present application. As shown in Figure 4 , this embodiment further provides a battery comprising a housing 8 and the aforementioned cover plate structure, which is disposed at the opening of housing 8 to form a sealed inner cavity. This battery prevents electrolyte from entering the gap between insulating member 3 and cover plate 2 and forming crystals, thereby preventing micro-conductivity between terminal 1 and cover plate 2 caused by crystallization, thereby ensuring battery quality.

[0039] In some embodiments, the battery may include a shell 8, a battery cell 9 and the above-mentioned cover structure, wherein the cover structure is arranged at the opening of the shell 8 to form a sealed inner cavity with the shell 8; the battery cell 9 is arranged in the sealed inner cavity and connected to the pole 1 on the cover structure.

Claims

1. A cover plate structure, comprising a pole column (1), a cover plate (2) and an insulating member (3). The pole column (1) partially penetrates through the through holes of the insulating member (3) and the cover plate (2). The insulating member (3) is partially disposed between the pole column (1) and the cover plate (2) so that there is a spaced arrangement between the pole column (1) and the inner wall of the through hole of the cover plate (2). A groove is provided around the pole column (1) on the surface of the insulating member (3) in contact with the cover plate (2). A protrusion is provided in a ring shape on the surface of the cover plate (2) in contact with the insulating member (3). The protrusion is circumferentially inserted into the groove.

2. The cover plate structure according to claim 1, wherein, The protrusion includes a first protrusion (21) and a second protrusion (22) which are spaced apart. The groove includes a first groove (32) and a second groove (33). The first protrusion (21) is circumferentially inserted into the first groove (32), and the second protrusion (22) is circumferentially inserted into the second groove (33).

3. The cover plate structure according to claim 2, wherein, The height of the first protrusion (21) is the same as the height of the second protrusion (22).

4. The cover plate structure according to claim 2, wherein, The first protrusion (21) abuts against the bottom of the first groove (32), and the second protrusion (22) abuts against the bottom of the second groove (33).

5. The cover plate structure according to claim 2, further comprising a first sealing ring (4). The first sealing ring (4) is clamped between the first protrusion (21) and the bottom of the first groove (32).

6. The cover plate structure according to claim 2, further comprising a second sealing ring (5). The second sealing ring (5) is clamped between the second protrusion (22) and the bottom of the second groove (33).

7. The cover plate structure according to claim 2, further comprising: A first sealing ring (4), the first sealing ring (4) is clamped between the first protrusion (21) and the bottom of the first groove (32); And A second sealing ring (5), the second sealing ring (5) is clamped between the second protrusion (22) and the bottom of the second groove (33).

8. The cover plate structure according to any one of claims 1-7, further comprising a third sealing ring (6). The third sealing ring (6) is sleeved on the pole column (1), and the third sealing ring (6) abuts against the surface of the pole column (1) between the insulating member (3) and the cover plate (2).

9. The cover plate structure according to claim 8, further comprising a lower plastic (7). The pole column (1) partially penetrates through the through hole of the lower plastic (7). The lower plastic (7) is partially abutted between the pole column (1) and the cover plate (2).

10. The cover plate structure according to claim 9, wherein, A third protrusion (11) is provided in a ring shape on the outer side surface of the end of the pole column (1) close to the cover plate (2). The surface of the third protrusion (11) close to the cover plate (2) abuts against both the lower plastic (7) and the third sealing ring (6).

11. The cover plate structure according to any one of claims 1-7, wherein, A first conical surface (31) is provided in a ring shape on the outer side of the insulating member (3). A second conical surface (23) is provided in a ring shape on the inner wall of the through hole of the cover plate (2). The first conical surface (31) and the second conical surface (23) are arranged in surface sealing fit.

12. A battery, comprising a housing (8), an electrode core (9), and a cover plate structure as described in any one of claims 1-11, wherein the cover plate structure is disposed at an opening of the housing (8) to form a sealed inner cavity with the housing (8); the electrode core (9) is disposed in the sealed inner cavity and is connected to a pole (1) on the cover plate structure.

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