CN218005057U - A cover assembly and battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, a apron subassembly is disclosed, including lamina tecti, plastic part, insulating sealing member and utmost point post, wherein the plastic part includes plastic and lower plastic, and insulating sealing member includes sealing washer and lower seal circle, and utmost point post includes utmost point post main part and the first convex part and the second convex part of establishing along the radial protruding of utmost point post main part. Can will go up the plastic when the assembly, go up the sealing washer, the lamina tecti, the lower seal circle and lower plastic overlap in proper order and locate utmost point post main part, so that this apron subassembly will realize the first convex part of plastic butt, lower plastic butt second convex part, and go up the sealing washer and will press from both sides and locate first convex part, go up the plastic, between lamina tecti and the utmost point post main part, the lower seal circle will press from both sides and locate the second convex part, lower plastic, the structure between lamina tecti and the utmost point post main part, can effectively guarantee utmost point post, go up the plastic, the sealed reliability between lamina tecti and the lower plastic, reduce the battery weeping problem. The utility model discloses still disclose a battery, including foretell apron subassembly.

Description

A cover assembly and battery

technical field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery.

Background technique

Lithium-ion batteries are widely used in modern electronic products and power vehicles due to their high energy density, long cycle life, and good rate performance. Existing cylindrical lithium batteries typically include a case that is open at both ends. The cell assembly, the positive end cap and the negative end cap, the cell assembly is set in the shell, the negative end cap is connected to the negative end of the cell assembly and welded to the opening at one end of the shell, and the positive end cap and the cell assembly The positive terminal is connected and welded to the opening at the other end of the shell. In addition, the end cap is also provided with a sealing ring, in addition to preventing short circuit between the positive and negative electrodes of the battery, it is also used to prevent the electrolyte of the battery from overflowing. However, most existing cylindrical lithium batteries use a single annular sealing ring, and its sealing performance is relatively weak. When the electrolyte inside the battery overflows to the vicinity of the sealing ring due to an accident, the electrolyte is likely to overflow from the pole of the end cap. affect battery life.

Therefore, there is an urgent need for a cover assembly and a battery to solve the above problems.

Utility model content

An object of the present invention is to provide a cover plate assembly, which can effectively reduce the leakage of the battery and ensure the service life of the battery.

As above design, the technical scheme that the utility model adopts is:

A cover assembly, comprising:

top cover;

The plastic parts include upper plastic and lower plastic, and the upper plastic, the top cover plate and the lower plastic are overlapped;

The insulating seal includes an upper sealing ring and a lower sealing ring, both of the upper sealing ring and the lower sealing ring are of L-shaped structure;

The pole includes a pole main body and a first protrusion and a second protrusion protruding along the radial direction of the pole main body, the top cover plate, the plastic part and the insulating seal are sleeved on on the main body of the pole, and the upper plastic is in contact with the first protrusion, the lower plastic is in contact with the second protrusion, and the upper sealing ring is sandwiched between the first protrusion and the Between the above plastic, the top cover plate and the pole main body, the lower sealing ring is sandwiched between the second protrusion, the lower plastic, the top cover plate and the pole main body.

Optionally, the outer diameter of the upper sealing ring is a, the outer diameter of the lower sealing ring is b, where a>b.

Optionally, a first annular groove is provided on the side of the upper plastic facing the first convex portion, and the first convex portion is located in the first annular groove and simultaneously abuts against a side of the first annular groove. Bottom and side walls.

Optionally, a first insertion post is provided on the bottom wall of the first annular groove, a first insertion hole is provided on the first protrusion, and the first insertion post penetrates the first insertion post. in a plug hole.

Optionally, the top cover plate is provided with a second annular groove on the side facing the upper plastic, and the upper plastic is provided with an annular protrusion on the side facing the top cover plate, and the annular protrusion is located on the side of the top cover plate. inside the second annular groove and abut against the bottom wall and the side wall of the second annular groove at the same time.

Optionally, an anti-rotation groove is provided on the side wall of the second annular groove, and an anti-rotation protrusion is also provided on the annular protrusion, and the annular protrusion is located in the second annular groove, so that The anti-rotation protrusion is located in the anti-rotation groove.

Optionally, a second insertion post is provided on the side of the lower plastic facing the top cover plate, a second insertion hole is provided on the top cover plate, and the second insertion post is inserted into the top cover plate. in the second insertion hole.

Optionally, the cover plate assembly also includes an explosion-proof valve, a pressure relief hole is provided on the top cover plate, a through hole communicating with the pressure relief hole is provided on the lower plastic, and the explosion-proof valve is provided on the inside the pressure relief hole.

Optionally, the cover plate assembly further includes a protective sheet, and the protective sheet is covered on a side of the explosion-proof valve away from the top cover plate.

Another object of the utility model is to provide a battery, which can effectively reduce the leakage of the battery and ensure the service life of the battery.

A battery includes the above-mentioned cover plate assembly.

The beneficial effects of the utility model are:

The cover plate assembly proposed by the utility model includes a top cover plate, a plastic part, an insulating seal and a pole, wherein the plastic part includes an upper plastic and a lower plastic, and the insulating seal includes an upper sealing ring and a lower sealing ring. During assembly, the upper plastic, the upper sealing ring, the top cover plate, the lower sealing ring and the lower plastic can be sleeved on the pole in sequence, and then the above-mentioned components are connected by a riveting process to form a cover plate assembly. After the pole is riveted, a pole body and a first protrusion and a second protrusion protruding along the radial direction of the pole body are formed, and both the upper sealing ring and the lower sealing ring have an L-shaped structure. On this basis, the cover assembly will realize that the upper plastic abuts against the first protrusion, the lower plastic abuts the second protrusion, and the upper sealing ring will be sandwiched between the first protrusion, the upper plastic, the top cover plate and the pole. Between the main body of the pole, the lower sealing ring will be sandwiched between the second convex part, the lower plastic, the top cover plate and the main body of the pole, which can effectively ensure the contact between the pole, the upper plastic, the top cover plate and the lower plastic. Seal reliability, reduce battery leakage, and ensure battery life.

The battery provided by the utility model includes the above-mentioned cover plate assembly, which has good sealing performance and superior product performance.

Description of drawings

Fig. 1 is an exploded view of the cover assembly provided by the embodiment of the present invention;

Fig. 2 is a cross-sectional view of the cover assembly provided by the embodiment of the present invention;

Fig. 3 is an exploded view of the battery provided by the embodiment of the present invention;

Fig. 4 is a cross-sectional view of the battery provided by the embodiment of the present invention;

Fig. 5 is a partial sectional view of the battery provided by the embodiment of the present invention (battery negative output terminal);

Fig. 6 is a partial cross-sectional view of the battery provided by the embodiment of the present invention (battery positive output end).

In the picture:

1. pole; 11. main body of pole; 12. first convex part; 13. second convex part;

2. Upper plastic; 21. The first annular groove; 22. The first plug-in post; 23. The annular protrusion; 24. The anti-rotation protrusion;

3. Upper sealing ring; 31. Upper inner ring; 32. Upper outer ring;

4. Top cover plate; 41. Second annular groove; 42. Anti-rotation groove; 43. Pressure relief hole;

5, the lower sealing ring; 51, the lower inner ring; 52, the lower outer ring;

6. Lower plastic; 61. Second plug-in post;

7. Explosion-proof valve; 8. Protective sheet;

10. Cover plate assembly; 20. Shell; 30. Battery core; 301. Positive pole lug; 302. Negative pole lug; 40. Positive pole current collector; 50. Negative pole current collector.

detailed description

In order to make the technical problem solved by the utility model, the adopted technical solution and the achieved technical effect clearer, the technical solution of the utility model will be further described below in conjunction with the accompanying drawings and through specific implementation methods. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the present utility model are shown in the drawings but not all of them.

In the description of the present utility model, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a Integral; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may include direct contact between the first and second features, and may also include the first and second features being in direct contact with each other. The features are not in direct contact but through another feature between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "left", "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

As shown in Figures 1 and 2, this embodiment provides a cover plate assembly 10, including a top cover plate 4, a plastic part, an insulating seal and a pole 1, wherein the plastic part includes an upper plastic 2 and a lower plastic 6, and the insulation The seal includes an upper sealing ring 3 and a lower sealing ring 5 . During assembly, the upper plastic 2, upper sealing ring 3, top cover plate 4, lower sealing ring 5 and lower plastic 6 can be sleeved on the pole 1 in sequence, and then the above-mentioned components are connected by riveting process to form a cover plate assembly 10. The cover plate assembly 10 is provided with two sealing rings between the pole 1 , the plastic part and the top cover 4 , which can effectively ensure the sealing effect on the pole 1 to prevent the electrolyte from leaking there.

Optionally, the upper sealing ring 3 and the lower sealing ring 5 are L-shaped structures, and the pole 1 can be formed with a pole main body 11 and a first protrusion 12 protruding along the radial direction of the pole main body 11 after riveting. The structure of the second protrusion 13 . Therefore, when the top cover plate 4, the upper plastic 2, the lower plastic 6, the upper sealing ring 3 and the lower sealing ring 5 are all sleeved on the pole main body 11, the upper plastic 2 abuts against the first protrusion 12, and the lower plastic 6 abuts Connect to the second convex part 13, and the upper sealing ring 3 will be sandwiched between the first convex part 12, the upper plastic 2, the top cover plate 4 and the pole main body 11, and the lower sealing ring 5 will be sandwiched between the second convex part Part 13, lower plastic 6, top cover plate 4 and pole main body 11, so as to ensure reliable sealing between pole 1, upper plastic 2, top cover plate 4 and lower plastic 6.

Wherein, the upper sealing ring 3 includes a connected upper inner ring 31 and an upper outer ring 32, and the lower sealing ring 5 includes a connected lower inner ring 51 and a lower outer ring 52. When the upper sealing ring 3 and the lower sealing ring 5 are sleeved on When the pole main body 11 is on, the upper inner ring 31 and the lower inner ring 51 abut, and the upper outer ring 32 is sandwiched between the upper plastic 2 and the top cover plate 4, and the lower outer ring 52 is sandwiched between the top cover plate 4 and the top cover plate 4. Between the lower plastic 6, so as to realize the tight fit between the insulating seal, the plastic part, the top cover plate 4 and the pole 1. Moreover, in order to prevent the electrolyte from overflowing from the lower sealing ring 5 to the upper sealing ring 3, in this embodiment, the outer diameter of the upper outer ring 32 is set to a, and the outer diameter of the lower outer ring 52 is set to b, and a>b.

Further, in order to ensure the insulation and sealing of the cover assembly 10 , the relative positions of the pole 1 and the overlapping upper plastic 2 , top cover 4 and lower plastic 6 are also kept fixed. Optionally, a first annular groove 21 is provided on the side of the upper plastic 2 facing the first protrusion 12 , and when the upper plastic 2 is sleeved on the pole main body 11 , the first protrusion 12 is located in the first annular groove 21 , and the first protrusion 12 will abut against the bottom wall and the side wall of the first annular groove 21 at the same time.

At the same time, in order to prevent the pole 1 from overcoming the friction resistance between the groove wall of the first annular groove 21 and rotating around its own circumference, the bottom wall of the first annular groove 21 is provided with a first plug-in column 22, the second A protrusion 12 is provided with a first insertion hole. When the upper plastic 2 is sleeved on the pole main body 11, in addition to ensuring that the first protrusion 12 of the pole 1 is located in the first annular groove 21, it should also ensure that the second A plugging column 22 passes through the first plugging hole. Optionally, the first insertion posts 22 are evenly spaced along the circumferential direction of the first annular groove 21 . In this embodiment, there are four first insertion posts 22 and four first insertion holes.

Furthermore, in order to ensure the rapid assembly of the top cover plate 4 and the upper plastic 2, the top cover plate 4 is provided with a second annular groove 41 on the side facing the upper plastic 2, and the upper plastic 2 is provided with a second annular groove 41 on the side facing the top cover plate 4. The annular protrusion 23, when the top cover plate 4 is sleeved on the pole main body 11, the annular protrusion 23 of the upper plastic 2 is located in the second annular groove 41, and simultaneously abuts against the bottom wall and the side of the second annular groove 41 wall.

Similarly, in order to prevent the upper plastic 2 from overcoming the friction resistance between the groove wall of the second annular groove 41 and rotating around its own circumference, the side wall of the second annular groove 41 is provided with an anti-rotation groove 42 , The anti-rotation protrusion 24 is also provided on the annular protrusion 23 , and when the annular protrusion 23 is located in the second annular groove 41 , the anti-rotation protrusion 24 should be located in the anti-rotation groove 42 . Optionally, the anti-rotation grooves 42 are evenly spaced along the circumference of the second annular groove 41 , and in this embodiment, there are four anti-rotation protrusions 24 and four anti-rotation grooves 42 .

In addition, in order to avoid the relative rotation of the top cover plate 4 and the lower plastic 6, the side of the lower plastic 6 facing the top cover plate 4 is provided with a second insertion post 61, and the top cover plate 4 is correspondingly provided with a second insertion hole. The plastic 6 is sheathed on the positive pole 1 , and when the lower plastic 6 contacts the top cover 4 , the second insertion post 61 is inserted into the second insertion hole. Optionally, the second insertion posts 61 are evenly spaced along the circumference of the top cover plate 4 , and in this embodiment, there are two second insertion posts 61 and two second insertion holes.

Optionally, the cover plate assembly further includes an explosion-proof valve 7 , and a pressure relief hole 43 is provided on the top cover plate 4 , and the explosion-proof valve 7 is installed in the pressure relief hole 43 . In case of short circuit, overcharge or overdischarge etc. inside the battery, a large amount of gas generated inside the battery will cause the explosion-proof valve 7 to explode, so as to discharge the gas inside the battery from the pressure relief hole 43 to achieve the purpose of pressure relief. Optionally, the lower plastic 6 is also provided with a through hole communicating with the pressure relief hole 43 to ensure that the pressure relief hole 43 communicates with the inside of the battery.

Optionally, the cover plate assembly further includes a protective sheet 8, which covers the explosion-proof valve 7 from the side of the explosion-proof valve 7 facing away from the top cover plate 4, so as to prevent the explosion-proof valve 7 from being damaged from the outside of the battery.

As shown in FIG. 3 and FIG. 4 , this embodiment also provides a battery, including the above-mentioned cover plate assembly 10 .

The battery also includes a casing 20 and a cell 30 , the casing 20 has an opening at only one end, the cell 30 is disposed inside the casing 20 , and the cover assembly 10 is disposed at the opening and is electrically connected to the cell 30 . Compared with the casing 20 provided with openings at both ends, the battery provided in this embodiment only needs to be provided with one cover plate assembly 10 as described above. Because the casing 20 and the top cover plate 4 of the cover plate assembly 10 are connected by welding, reducing the number of cover plate assemblies 10 can reduce the welding process in the battery assembly process and reduce the leakage of liquid caused by poor welding. , to ensure the product performance of the battery.

Optionally, the battery further includes a positive electrode current collecting plate 40 and a negative electrode current collecting plate 50, and the cover assembly 10 in this embodiment is a negative electrode cover plate assembly, that is, the negative electrode ear 302 of the battery cell 30 is electrically connected through the negative electrode current collecting plate 50 The positive tab 301 of the cell 30 is electrically connected to the casing 20 through the positive collector plate 40 . The electrical connection between the shell 20 and the positive electrode of the battery cell 30 can reduce the corrosion of the battery to the shell 20 during the cycle charging process.

Optionally, as shown in FIG. 5 , in this embodiment, the negative electrode tab 302 of the battery, the negative electrode collector plate 50 and the negative electrode cover plate assembly 10 are connected by laser welding. As shown in FIG. 6 , in this embodiment, the positive electrode tab 301 of the battery, the positive electrode collector plate 40 and the casing 20 are connected by laser welding.

The above embodiments only set forth the basic principles and characteristics of the present utility model. The present utility model is not limited by the above-mentioned embodiments. On the premise of not departing from the spirit and scope of the present utility model, the present utility model also has various changes and changes. These Variations and changes are within the scope of the claimed invention. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (10)

1. A cover plate assembly, comprising:

a top cover plate (4);

the plastic part comprises an upper plastic (2) and a lower plastic (6), and the upper plastic (2), the top cover plate (4) and the lower plastic (6) are arranged in an overlapping mode;

the insulating sealing element comprises an upper sealing ring (3) and a lower sealing ring (5), and the upper sealing ring (3) and the lower sealing ring (5) are both L-shaped structures;

utmost point post (1), including utmost point post main part (11) and edge first convex part (12) and second convex part (13) that the radial protruding of utmost point post main part (11) was established, roof plate (4) the plastic spare with insulating seal all overlaps and locates on utmost point post main part (11), just go up plastic (2) butt first convex part (12), plastic (6) butt down second convex part (13), go up sealing washer (3) and press from both sides and locate first convex part (12), go up plastic (2), roof plate (4) with between utmost point post main part (11), lower sealing washer (5) press from both sides and locate second convex part (13), plastic (6), roof plate (4) and between utmost point post main part (11).

2. The closure assembly according to claim 1, wherein the upper sealing ring (3) has an outer diameter a and the lower sealing ring (5) has an outer diameter b, a > b.

3. The cover plate assembly according to claim 1, characterized in that the side of the upper plastic (2) facing the first protrusion (12) is provided with a first annular groove (21), the first protrusion (12) being located in the first annular groove (21) and abutting against both the bottom wall and the side wall of the first annular groove (21).

4. The cover plate assembly according to claim 3, wherein a first plug-in post (22) is disposed on a bottom wall of the first annular groove (21), a first plug-in hole is disposed on the first convex portion (12), and the first plug-in post (22) is inserted into the first plug-in hole.

5. The cover plate assembly according to claim 1, wherein a second annular groove (41) is provided on a side of the top cover plate (4) facing the upper plastic (2), and an annular protrusion (23) is provided on a side of the upper plastic (2) facing the top cover plate (4), wherein the annular protrusion (23) is located in the second annular groove (41) and abuts against a bottom wall and a side wall of the second annular groove (41) at the same time.

6. The cover plate assembly according to claim 5, wherein an anti-rotation groove (42) is provided on a side wall of the second annular groove (41), an anti-rotation protrusion (24) is further provided on the annular protrusion (23), the annular protrusion (23) is located in the second annular groove (41), and the anti-rotation protrusion (24) is located in the anti-rotation groove (42).

7. The cover plate assembly according to any one of claims 1 to 6, wherein a side of the lower plastic (6) facing the top cover plate (4) is provided with a second plug-in post (61), the top cover plate (4) is provided with a second plug-in hole, and the second plug-in post (61) is inserted into the second plug-in hole.

8. The cover plate assembly according to any one of claims 1 to 6, further comprising an explosion-proof valve (7), wherein a pressure relief hole (43) is formed in the top cover plate (4), a through hole communicating with the pressure relief hole (43) is formed in the lower plastic (6), and the explosion-proof valve (7) is disposed in the pressure relief hole (43).

9. The cover plate assembly according to claim 8, characterized in that it further comprises a protective sheet (8), said protective sheet (8) covering the side of the explosion-proof valve (7) facing away from the top cover plate (4).

10. A battery comprising a cover plate assembly according to any one of claims 1 to 9.

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