CN218005057U

CN218005057U - Cover plate assembly and battery

Info

Publication number: CN218005057U
Application number: CN202221828156.5U
Authority: CN
Inventors: 闵昌飞; 肖天丽; 黄利明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-12-09
Anticipated expiration: 2032-07-15

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

Cover plate assembly and battery

Technical Field

The utility model relates to a battery technology field especially relates to an apron subassembly and battery.

Background

The lithium ion battery is widely applied to modern electronic products and power automobiles due to the advantages of large energy density, long cycle life, good rate performance and the like. Existing cylindrical lithium batteries typically include a housing that is open at both ends. The battery cell assembly is arranged in the shell, the negative electrode end cover is connected with the negative electrode end of the battery cell assembly and welded at the opening at one end of the shell, and the positive electrode end cover is connected with the positive electrode end of the battery cell assembly and welded at the opening at the other end of the shell. In addition, the end cover is also provided with a sealing ring which can prevent the short circuit of the anode and the cathode of the battery and is also used for avoiding the overflow of the electrolyte of the battery. However, the existing cylindrical lithium battery mostly adopts a single annular sealing ring, the sealing performance of the sealing ring is relatively weak, when electrolyte inside the battery overflows to the vicinity of the sealing ring due to accidents, the electrolyte easily overflows from a pole of an end cover, and the service life of the battery is influenced.

Therefore, a cover assembly and a battery are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cover plate assembly can effectively reduce the weeping condition of battery, guarantees the life of battery.

As the conception, the utility model adopts the technical proposal that:

a cover plate assembly comprising:

a top cover plate;

the plastic part comprises an upper plastic and a lower plastic, and the upper plastic, the top cover plate and the lower plastic are arranged in an overlapping mode;

the insulating sealing element comprises an upper sealing ring and a lower sealing ring, and the upper sealing ring and the lower sealing ring are both of L-shaped structures;

utmost point post, including utmost point post main part and edge the first convex part and the second convex part of radial protruding the establishing of utmost point post main part, the lamina tecti the plastic part with insulating seal all overlaps and locates in the utmost point post main part, just go up the plastic butt first convex part, the plastic butt down the second convex part, go up the sealing washer and press from both sides and locate first convex part go up the plastic the lamina tecti with between the utmost point post main part, the sealing washer presss from both sides and locates down the second convex part plastic, lamina tecti and between the utmost point post main part.

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

Optionally, one side of the upper plastic facing the first protruding portion is provided with a first annular groove, and the first protruding portion is located in the first annular groove and abuts against the bottom wall and the side wall of the first annular groove at the same time.

Optionally, a first inserting column is arranged on the bottom wall of the first annular groove, a first inserting hole is formed in the first protruding portion, and the first inserting column penetrates through the first inserting hole.

Optionally, the lamina tecti orientation one side of going up the plastic is provided with the second ring channel, it is equipped with annular bulge towards to go up the plastic one side of lamina tecti, annular bulge is located in the second ring channel and the butt simultaneously the diapire and the lateral wall of second ring channel.

Optionally, an anti-rotation groove is formed in the side wall of the second annular groove, an anti-rotation protrusion is further arranged on the annular protrusion, the annular protrusion is located in the second annular groove, and the anti-rotation protrusion is located in the anti-rotation groove.

Optionally, a second plug-in post is arranged on one side, facing the top cover plate, of the lower plastic, a second plug-in hole is formed in the top cover plate, and the second plug-in post is inserted into the second plug-in hole.

Optionally, the cover plate assembly further comprises an explosion-proof valve, a pressure relief hole is formed in the top cover plate, a through hole communicated with the pressure relief hole is formed in the lower plastic, and the explosion-proof valve is arranged in the pressure relief hole.

Optionally, the cover plate assembly further comprises a protection sheet, and the protection sheet covers one side of the explosion-proof valve, which deviates from the top cover plate.

Another object of the utility model is to provide a battery can effectively reduce the weeping condition of battery, guarantees the life of battery.

A battery comprising a cover plate assembly as described above.

The utility model has the advantages that:

the utility model provides an apron subassembly includes lamina tecti, plastic part, insulating sealing member and utmost point post, and wherein the plastic part includes plastic and lower plastic, and insulating sealing member includes sealing washer and lower seal circle. During assembly, the upper plastic, the upper sealing ring, the top cover plate, the lower sealing ring and the lower plastic are sequentially sleeved on the pole, and then all the parts are connected through a riveting process to form the cover plate assembly. The utmost point post forms utmost point post main part and along the first convex part and the second convex part of the radial protruding establishment of utmost point post main part after the riveting, and goes up sealing washer and lower sealing washer and be L type structure. On this basis, this apron subassembly will realize the first convex part of last plastic butt, lower plastic butt second convex part, and go up the sealing washer and will press from both sides and locate between first convex part, last plastic, lamina tecti and utmost point post main part, and the structure between second convex part, lower plastic, lamina tecti and the utmost point post main part will be located to lower sealing washer, can effectively guarantee utmost point post, go up the plastic, the lamina tecti and down the sealed reliability between the plastic, reduce the battery weeping problem, guarantee the life of battery.

The utility model provides a battery includes foretell apron subassembly, and its leakproofness is good, and product property can be superior.

Drawings

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

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

fig. 3 is an exploded view of a battery according to an embodiment of the present invention;

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

fig. 5 is a partial cross-sectional view of a battery provided by an embodiment of the present invention (battery negative output end);

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

In the figure:

1. a pole column; 11. a pole body; 12. a first convex portion; 13. a second convex portion;

2. plastic is coated; 21. a first annular groove; 22. a first plug-in column; 23. an annular projection; 24. an anti-rotation protrusion;

3. an upper sealing ring; 31. an upper inner ring; 32. an upper outer ring;

4. a top cover plate; 41. a second annular groove; 42. an anti-rotation groove; 43. a pressure relief vent;

5. a lower seal ring; 51. a lower inner ring; 52. a lower outer ring;

6. plastic is discharged; 61. a second plug column;

7. an explosion-proof valve; 8. a protective sheet;

10. a cover plate assembly; 20. a housing; 30. an electric core; 301. a positive tab; 302. a negative tab; 40. a positive current collecting plate; 50. an anode current collecting plate.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 and 2, the present embodiment provides a cover plate assembly 10, which includes a top cover plate 4, a plastic component, an insulating sealing component and a terminal 1, wherein the plastic component includes an upper plastic 2 and a lower plastic 6, and the insulating sealing component includes an upper sealing ring 3 and a lower sealing ring 5. During assembly, the upper plastic 2, the upper sealing ring 3, the top cover plate 4, the lower sealing ring 5 and the lower plastic 6 can be sequentially sleeved on the pole 1, and then all the parts are connected through a riveting process to form the cover plate assembly 10. This apron subassembly 10 presss from both sides between utmost point post 1, plastic part and top deck 4 and is equipped with two sealing washers, can effectively guarantee the sealed effect to utmost point post 1 department to avoid electrolyte to spill from this department.

Alternatively, the upper sealing ring 3 and the lower sealing ring 5 are both L-shaped structures, and the pole 1 after riveting can be formed into a structure with the pole body 11 and the first convex part 12 and the second convex part 13 protruding along the radial direction of the pole body 11. Therefore, when the top cover plate 4, the upper plastic 2, the lower plastic 6, the upper seal ring 3 and the lower seal ring 5 are all sleeved on the pole body 11, the upper plastic 2 abuts against the first convex portion 12, the lower plastic 6 abuts against the second convex portion 13, the upper seal ring 3 is clamped between the first convex portion 12, the upper plastic 2, the top cover plate 4 and the pole body 11, and the lower seal ring 5 is clamped between the second convex portion 13, the lower plastic 6, the top cover plate 4 and the pole body 11, so that reliable sealing among the pole 1, the upper plastic 2, the top cover plate 4 and the lower plastic 6 is ensured.

The upper sealing ring 3 comprises an upper inner ring 31 and an upper outer ring 32 which are connected, the lower sealing ring 5 comprises a lower inner ring 51 and a lower outer ring 52 which are connected, when the upper sealing ring 3 and the lower sealing ring 5 are both sleeved on the pole main body 11, the upper inner ring 31 is abutted against the lower inner ring 51, the upper outer ring 32 is clamped between the upper plastic 2 and the top cover plate 4, and the lower outer ring 52 is clamped between the top cover plate 4 and the lower plastic 6, so that the tight fit among the insulating sealing element, the plastic element, the top cover plate 4 and the pole 1 is realized. In order to prevent the electrolyte from overflowing from the lower seal ring 5 to the upper seal ring 3, in the present embodiment, the outer diameter of the upper outer ring 32 is a, the outer diameter of the lower outer ring 52 is b, and a > b.

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

Simultaneously, for avoid utmost point post 1 overcome with the cell wall between the cell wall of first ring channel 21 friction resistance and take place around the rotation of self circumference, be provided with first plug-in post 22 on the diapire of first ring channel 21, be provided with first spliced eye on the first convex part 12, when last plastic 2 covers locate utmost point post main part 11 on, except that the first convex part 12 of guaranteeing utmost point post 1 is located first ring channel 21, still should guarantee that first plug-in post 22 wears to locate in the first spliced eye. Optionally, the first plug columns 22 are uniformly spaced along the circumferential direction of the first annular groove 21, and in this embodiment, four first plug columns 22 and four first plug holes are provided.

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

Similarly, in order to prevent the upper plastic 2 from rotating around its circumferential direction due to overcoming the frictional resistance with the wall of the second annular groove 41, an anti-rotation groove 42 is provided on the sidewall of the second annular groove 41, and an anti-rotation protrusion 24 is further 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. Alternatively, the anti-rotation grooves 42 are uniformly spaced along the circumferential direction of the second annular groove 41, and in this embodiment, four anti-rotation protrusions 24 and four anti-rotation grooves 42 are provided.

In addition, in order to avoid the relative rotation of the top cover plate 4 and the lower plastic 6, one 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 correspondingly provided with a second plug-in hole, when the lower plastic 6 is sleeved on the positive post 1 and the lower plastic 6 is abutted against the top cover plate 4, the second plug-in post 61 is inserted into the second plug-in hole. Optionally, the second plug-in columns 61 are uniformly spaced along the circumferential direction of the top cover plate 4, and in this embodiment, two second plug-in columns 61 and two second plug-in holes are provided.

Optionally, the cover plate assembly further includes an explosion-proof valve 7, the top cover plate 4 is further provided with a pressure relief hole 43, and the explosion-proof valve 7 is installed in the pressure relief hole 43. When a short circuit, overcharge or overdischarge occurs in the battery, a large amount of gas generated in the battery will explode the explosion-proof valve 7 to discharge the gas in the battery from the pressure relief hole 43, thereby achieving the purpose of pressure relief. Optionally, a through hole communicated with the pressure relief hole 43 is further formed in the lower plastic 6 to ensure that the pressure relief hole 43 is communicated with the inside of the battery.

Optionally, the cover plate assembly further comprises a protection sheet 8, and one side of the protection sheet 8, which is far away from the top cover plate 4, from the explosion-proof valve 7 is covered on the explosion-proof valve 7, so that the explosion-proof valve 7 is prevented from being damaged from the outside of the battery.

As shown in fig. 3 and 4, the present embodiment also provides a battery including the above-described cap plate assembly 10.

The battery further comprises a shell 20 and a battery core 30, wherein the shell 20 has an opening only at one end, the battery core 30 is disposed in the shell 20, and the cover plate assembly 10 is disposed at the opening and electrically connected to the battery core 30. The battery provided in this embodiment requires only one cap plate assembly 10 as described above, compared to the case 20 having openings at both ends. Because the shell 20 is connected with the top cover plate 4 of the cover plate assembly 10 by welding, the number of the cover plate assemblies 10 is reduced, namely the welding procedures in the battery assembling process can be reduced, the liquid leakage condition caused by poor welding can be reduced, and the product performance of the battery can be ensured.

Optionally, the battery further includes a positive current collecting plate 40 and an negative current collecting plate 50, and the cover plate assembly 10 in this embodiment is a negative cover plate assembly, that is, the negative tab 302 of the cell 30 is electrically connected to the cover plate assembly 10 through the negative current collecting plate 50, and the positive tab 301 of the cell 30 is electrically connected to the casing 20 through the positive current collecting plate 40. The positive electrodes of the housing 20 and the battery core 30 are electrically connected, so that the corrosion of the battery to the housing 20 in the cyclic charging process can be reduced.

Alternatively, as shown in fig. 5, in the present embodiment, the negative electrode tab 302, the negative electrode current collecting disk 50, and the negative electrode lid plate assembly 10 of the battery are connected by laser welding. As shown in fig. 6, in the present embodiment, the positive tab 301, the positive current collecting plate 40, and the case 20 of the battery are connected by laser welding.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

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.