CN216698525U

CN216698525U - Secondary battery top cap and secondary battery thereof

Info

Publication number: CN216698525U
Application number: CN202123433103.1U
Authority: CN
Inventors: 邓平华; 王雷; 刘涛
Original assignee: Jiangxi Baisili New Energy Technology Co ltd
Current assignee: Jiangxi Baisili New Energy Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-07
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a secondary battery top cover and a secondary battery thereof, wherein the secondary battery top cover is used for sealing a shell for accommodating a battery core and comprises a top cover plate, a liquid injection hole and a boss formed by extending the top cover plate along the direction facing the battery core, the liquid injection hole comprises a first through hole formed by penetrating the top cover plate through the liquid injection hole along the vertical direction and a second through hole formed by penetrating the boss through the liquid injection hole along the vertical direction, the first through hole and the second through hole are the same central shaft, and a sealing assembly in threaded connection is arranged in the liquid injection hole. Compared with the prior art, the sealing assembly in threaded connection is arranged in the liquid injection hole of the secondary battery top cover, so that adverse effects caused by welding of the sealing nail can be avoided, and meanwhile, the threaded connection is detachable, namely the sealing assembly can be detached immediately after use, so that the liquid injection efficiency can be improved. Meanwhile, the lug boss formed by extending the top cover plate along the direction facing the battery core can prolong the length of the liquid injection hole, so that the threaded connection firmness of the sealing assembly and the liquid injection hole can be enhanced.

Description

Secondary cell top cap and secondary cell thereof

Technical Field

The utility model relates to the field of energy storage instruments, in particular to a secondary battery top cover and a secondary battery thereof.

Background

With the development of modern society and the enhancement of environmental awareness of people, more and more driving power supplies of electric tools and new energy vehicles develop towards the directions of high capacity and high safety, which provides a wide space for the application and development of secondary batteries.

The top cover piece of the secondary battery is generally provided with a positive electrode introducing hole, a negative electrode introducing hole, a liquid injection hole and an explosion-proof valve hole, electrolyte is required to be injected into the battery shell through the liquid injection hole during production, and then a sealing nail is welded on the liquid injection hole. After the liquid injection is finished, a certain pressure is left in the battery shell, and the electrolyte is easy to splash and pollute the top cover plate when the liquid injection nozzle is withdrawn. If the sealing nail is not cleaned during welding, poor welding is easily caused, an additional cleaning step is needed, so that the production cost is increased, and the production efficiency is reduced. Need carry out the evacuation to battery case earlier when annotating the liquid, just can annotate the liquid, because annotate the liquid hole only one, the centre needs many times evacuation to annotate liquid many times and can accomplish whole notes liquid operation, very big reduction annotate the efficiency of liquid process.

SUMMERY OF THE UTILITY MODEL

Based on the problems, the utility model provides a secondary battery top cover and a secondary battery thereof, wherein a liquid injection hole in the secondary battery top cover is in threaded connection with a sealing assembly, so that adverse effects caused by welding of a sealing nail can be avoided, and meanwhile, the threaded connection is detachable, namely, the threaded connection is detached immediately, so that the liquid injection efficiency can be improved.

In order to achieve the above object, a first aspect of the present invention provides a secondary battery top cap for sealing a casing accommodating a battery cell, including a top cover plate, a liquid injection hole and a boss formed by extending the top cover plate in a direction facing the battery cell, wherein the liquid injection hole includes a first through hole formed by penetrating the top cover plate through itself in an up-down direction and a second through hole formed by penetrating the boss through itself in an up-down direction, the first through hole and the second through hole are the same central axis, and a sealing assembly in threaded connection is disposed in the liquid injection hole.

Compared with the prior art, the sealing assembly in threaded connection is arranged in the liquid injection hole of the secondary battery top cover, so that adverse effects caused by welding of the sealing nail can be avoided, and meanwhile, the threaded connection is detachable, namely the sealing assembly can be detached immediately after use, so that the liquid injection efficiency can be improved. Meanwhile, the lug boss formed by extending the top cover plate along the direction facing the battery core can prolong the length of the liquid injection hole, so that the threaded connection firmness of the sealing assembly and the liquid injection hole can be enhanced.

Preferably, the sealing assembly comprises an elastic ring and a rigid threaded plug in threaded connection with the liquid injection hole, the elastic ring is sleeved on the rigid threaded plug and abuts against the rigid threaded plug and the peripheral wall of the liquid injection hole, and the arrangement of the elastic ring can improve the sealing performance between the liquid injection hole and the rigid threaded plug.

Preferably, the sealing assembly comprises an elastic piece and a rigid threaded plug connected with the liquid injection hole in a threaded manner, the elastic piece is sleeved on the rigid threaded plug and is clamped in the first through hole, the arrangement of the elastic piece clamped in the first through hole can improve the sealing performance between the liquid injection hole and the rigid threaded plug, and the threaded connection of the sealing assembly can be facilitated.

Preferably, the first through hole is a stepped hole, the aperture of the upper part is larger than that of the lower part, and the elastic part is clamped at the step of the first through hole.

Preferably, the elastic member includes a body portion and a protrusion portion formed by extending one end of the body portion downward, the protrusion portion is disposed between the rigid threaded plug and the liquid injection hole, and the rigid threaded plug includes a head portion abutting against the body portion and a column portion extending downward from the head portion and threadedly connected to the second through hole.

Preferably, the top cover plate is provided with a first pole column unit and a second pole column unit, the top cover plate is provided with a first introduction hole, the first pole column unit comprises a first pole column, a first sealing element, a first connecting element and a first upper insulating element, the first pole column penetrates through and is fixed in the first introduction hole, the first sealing element is arranged between the first pole column and the top cover plate, the first upper insulating element is clamped on the top cover plate, one end of the first connecting element is clamped on the first upper insulating element, and the other end of the first connecting element is clamped on the first pole column. The two ends of the first connecting piece are respectively clamped with the first upper insulating piece and the first pole, so that the connection firmness of the first pole unit can be enhanced.

Preferably, the upper surface of the top cover plate surrounds the first lead-in hole and is concaved to form a first groove which is in clamping fit with the first upper insulating part.

Preferably, the first connecting piece comprises a rigid portion clamped to the first upper insulating piece and an elastic portion which can be clamped to the first pole column under the extrusion of an external force, and the first pole column unit can be conveniently assembled due to the arrangement of the elastic portion of the first connecting piece.

Preferably, the top of the first pole column is provided with a clamping part which is fixedly clamped with the elastic part.

Preferably, the rigid portion is a circular ring body, and the elastic portion is a plurality of saw teeth formed by inward extension of the rigid portion.

Preferably, a lower insulating part is arranged between the top cover plate and the first pole column, and the lower insulating part is clamped and fixed on the first pole column.

Preferably, the top cover plate is further provided with a second introduction hole, the second pole column unit comprises a second pole column, a second sealing element, a second connecting element and a second upper insulating element, the second pole column penetrates through and is fixed in the second introduction hole, the second sealing element is arranged between the second pole column and the top cover plate, the second upper insulating element is clamped to the top cover plate, one end of the second connecting element is clamped to the second upper insulating element, and the other end of the second connecting element is clamped to the second pole column.

The utility model also provides a secondary battery, which comprises a battery core, a shell for accommodating the battery core and a top cover for sealing the shell, wherein the top cover is the secondary battery top cover. The liquid injection hole and the sealing component of the secondary battery are detachable, and can be detached immediately after use, so that the liquid injection efficiency can be improved.

Drawings

Fig. 1 is a plan view of an embodiment of a top cap for a secondary battery according to the present invention.

Fig. 2 is a bottom view of an embodiment of a secondary battery top cap according to the present invention.

Fig. 3 is a cross-sectional view taken along a-a of fig. 1.

Fig. 4 is a variation of fig. 3.

Fig. 5 is an exploded view of the top cap of the secondary battery according to the present invention in one direction.

Fig. 6 is a variation of fig. 5.

Fig. 7 is an exploded view of the top cap of the secondary battery according to the present invention in another direction.

Fig. 8 is a variation of fig. 7.

Fig. 9 is an enlarged view of a portion B in fig. 3.

Fig. 10 is an enlarged view of a portion D in fig. 4.

Fig. 11 is a variation of fig. 10.

Fig. 12 is an enlarged view of a portion a in fig. 3.

Fig. 13 is an enlarged view of a portion C in fig. 3.

Description of the elements

100-secondary battery top cover; 1-top cover sheet; 11-a first via; 12-a first introduction hole; 13-a second introduction hole; 14-a first groove; 15-a second groove; 16-explosion-proof valve mounting holes; 2-liquid injection hole; 3-boss; 31-a second via; 4-a sealing assembly; 41-elastic ring; 43-rigid threaded plug; 431-a head; 433-a column portion; 45-a resilient member; 451-a body portion; 453-a boss; 5-a first pole unit; 51-a first pole; 511-a clamping part; 53-a first seal; 55-a first connector; 551-a rigid portion; 553-an elastic part; 57-a first upper insulator; 6-a second pole column unit; 61-a second pole; 611-a second clamping part; 63-a second seal; 65-a second connector; 651-second rigid portion; 653 — a second elastic part; 67-a second upper insulator; 7-an explosion-proof valve assembly; 71-an explosion-proof valve; 73-explosion-proof valve protection plate; 8-a lower insulator;

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, in general, the secondary battery is placed vertically, one side of the secondary battery top cover, which extends out and is connected with the outside, is an upper side, i.e., a top direction, and the other side is a lower side, i.e., a bottom direction.

The secondary battery top cap and the secondary battery according to the present invention will be described with reference to the accompanying drawings.

Referring to fig. 1 to 8, the secondary battery includes a battery cell, a case for accommodating the battery cell, and a secondary battery top cover 100 for sealing the case, wherein the secondary battery top cover 100 is welded to the case to be sealed, and a secondary battery electrolyte for infiltrating the battery cell is injected into the case. The secondary battery top cap 100 includes a top cap plate 1, and a first pole unit 5, a second pole unit 6, and an explosion-proof valve assembly 7 disposed on the top cap plate 1. The top cover plate 1 is provided with a first lead-in hole 12, a second lead-in hole 13 and an explosion-proof valve mounting hole 16, the first lead-in hole 12 is connected with the first pole unit 5, and the second lead-in hole 13 is connected with the second pole unit 6. The explosion-proof valve assembly 7 comprises an explosion-proof valve 71 and an explosion-proof valve protecting piece 73, the explosion-proof valve 71 is arranged in the explosion-proof valve mounting hole 16, and the explosion-proof valve protecting piece 73 is arranged above the explosion-proof valve 71.

With further reference to fig. 1-8 and 12, the top cover sheet 1 is provided with a first pole unit 5 and a second pole unit 6. The first pole unit 2 of the present invention may be referred to as a positive pole unit or a negative pole unit, and the corresponding second pole unit 3 may be referred to as a negative pole unit or a positive pole unit. First utmost point post unit 5 includes first utmost point post 51, first sealing member 53, first connecting piece 55 and first last insulating part 57, and first utmost point post 51 is worn to establish and is fixed in first introduction hole 12, and first sealing member 53 is between first utmost point post 51 and top cap piece 1, and first insulating part 57 joint in top cap piece 1 of going up, the one end joint of first connecting piece 55 in first last insulating part 57, the other end joint in first utmost point post 51. The two ends of the first connecting member 55 are respectively clamped with the first upper insulating member 57 and the first pole 51, so that the connection firmness of the first pole unit 5 can be enhanced. Further, the upper surface of the top cover plate 1 is recessed around the first lead-in hole 12 to form a first groove 14 snap-fitted with the first upper insulator 57. The first connecting member 55 includes a rigid portion 551 connected to the first upper insulating member 57 and an elastic portion 553 extruded by external force and connected to the first pole 51, a connecting portion 511 connected to the elastic portion 553 is disposed at the top of the first pole 51, and the elastic portion 553 of the first connecting member 55 facilitates the assembly of the first pole unit 5. Specifically, the rigid portion 551 is a circular ring, and the elastic portion 553 is a plurality of serrations formed by extending inward from the rigid portion 551.

As shown in fig. 13, the second pole unit 6 may have a symmetrical structure with the first pole unit 5. The second pole column unit 6 comprises a second pole column 61, a second sealing element 63, a second connecting element 65 and a second upper insulating element 67, the second pole column 61 is arranged in the second lead-in hole 13 in a penetrating mode and fixed, the second sealing element 63 is arranged between the second pole column 61 and the top cover plate 1, the second upper insulating element 67 is clamped on the top cover plate 1, one end of the second connecting element 65 is clamped on the second upper insulating element 67, and the other end of the second connecting element 65 is clamped on the second pole column 61. The two ends of the second connecting piece 65 are respectively clamped with the second upper insulating piece 67 and the second pole 61, so that the connection firmness of the second pole unit 6 can be enhanced. Further, the upper surface of the top cover plate 1 is recessed around the second lead-in hole 13 to form a second groove 15 for snap-fitting with the second upper insulator 67. The second connecting member 65 includes a second rigid portion 651 engaged with the second upper insulating member 67 and a second elastic portion 653 pressed by an external force and engageable with the second pole 61, the top of the second pole 61 is provided with a second engaging portion 611 engaged with the second elastic portion 653, and the second elastic portion 653 of the second connecting member 65 is convenient for assembling the second pole unit 6. Specifically, the second rigid part 651 is a circular ring body, and the second elastic part 653 is a plurality of serrations formed by extending inward from the second rigid part 651.

As shown in fig. 1 to 11, a liquid injection hole 2 is formed in the top cover plate 1, the top cover plate 1 extends in a direction facing the electric core to form a boss 3, the liquid injection hole 2 includes a first through hole 11 formed by the top cover plate 1 penetrating through itself in the vertical direction and a second through hole 31 formed by the boss 3 penetrating through itself in the vertical direction, the first through hole 11 and the second through hole 31 are the same central axis, and a sealing assembly 4 connected by screw threads is arranged in the liquid injection hole 2. Annotate the sealing component 4 that is equipped with threaded connection in the liquid hole 2, can avoid the produced harmful effects of sealed nail welding, threaded connection is detachable mode simultaneously, and the usefulness is torn open promptly, can improve notes liquid efficiency. The top cover plate 1 extends along the direction facing the battery core to form a boss 3, so that the length of the liquid injection hole 2 can be prolonged, and the threaded connection firmness of the sealing assembly 4 and the liquid injection hole 2 can be enhanced.

The sealing member 4 may have various configurations, as shown in fig. 5, 7 and 9, the sealing member 4 includes an elastic ring 41 and a rigid threaded plug 43 screwed to the pouring hole 2, the elastic ring 41 is fitted over the rigid threaded plug 43 and abuts between the rigid threaded plug 43 and the peripheral wall of the pouring hole 2, and the elastic ring 41 is provided to improve the sealing performance between the pouring hole 2 and the rigid threaded plug 43. The rigid threaded plug 43 includes a head 431 and a body 433 extending downwardly from the head 431 and threadably engaging the second bore 31. The first through hole 11 is a stepped hole, the aperture of the upper portion is larger than that of the lower portion, and the head portion 431 is clamped at the step of the first through hole 11.

The sealing assembly 4 may also be as shown in fig. 6, 8 and 10, the sealing assembly 4 includes an elastic member 45 and a rigid threaded plug 43 in threaded connection with the liquid injection hole 2, the elastic member 45 is sleeved on the rigid threaded plug 43 and is clamped in the first through hole 11, and the arrangement of the elastic member 45 clamped in the first through hole 11 not only can improve the sealing performance between the liquid injection hole 2 and the rigid threaded plug 43, but also can facilitate the threaded connection of the sealing assembly 2. The first through hole 11 is a stepped hole, the aperture of the upper portion is larger than that of the lower portion, and the elastic member 45 is clamped at the step of the first through hole 11. The elastic member 45 includes a body portion 451 and a projection 453 formed by extending one end of the body portion 451 downward, the projection 453 is provided between the rigid screw stopper 43 and the pouring hole 2, and the rigid screw stopper 43 includes a head portion 431 abutting against the body portion 451 and a column portion 433 extending downward from the head portion 431 and screwed into the second through-hole 31. Of course, the elastic member 45 may have other configurations, and as shown in fig. 11, the elastic member 45 has a hollow frustum structure and is disposed around the outer side of the head 431 of the rigid threaded plug 43.

It should be noted that, lower insulating members 8 are disposed between the top cover plate 1 and the first pole post 51 and between the top cover plate 1 and the second pole post 61, and the lower insulating members 8 are clamped and fixed to the first pole post 51 and the second pole post 61, so as to electrically insulate the top cover plate 1 from the battery cell in the housing. The first upper insulator 57 and the second upper insulator 67 may be injection molded during installation, or may be extruded before installation, and have a certain elastic modulus and may deform.

It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the utility model, and that those skilled in the art will be able to modify the utility model in its various equivalent forms after reading the present invention and to fall within the scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides a secondary battery top cap (100) for the sealed casing that holds electric core, its characterized in that, including top cover plate (1), annotate liquid hole (2) and by top cover plate (1) along facing the boss (3) that the direction of electric core extended formation, annotate liquid hole (2) including top cover plate (1) along the upper and lower direction run through itself and first through-hole (11) that form with boss (3) along the upper and lower direction run through itself and second through-hole (31) that form, first through-hole (11) with second through-hole (31) are same center pin, annotate the seal assembly (4) that are equipped with threaded connection in liquid hole (2).

2. The secondary battery top cap (100) according to claim 1, wherein the sealing member (4) comprises an elastic ring (41) and a rigid threaded plug (43) screwed with the liquid injection hole (2), and the elastic ring (41) is sleeved on the rigid threaded plug (43) and abuts between the rigid threaded plug (43) and the peripheral wall of the liquid injection hole (2).

3. The secondary battery top cover (100) according to claim 1, wherein the sealing assembly (4) comprises an elastic member (45) and a rigid threaded plug (43) in threaded connection with the liquid injection hole (2), and the elastic member (45) is sleeved on the rigid threaded plug (43) and clamped in the first through hole (11).

4. The secondary battery top cap (100) according to claim 3, wherein the first through hole (11) is a stepped hole, the diameter of the upper portion is larger than that of the lower portion, and the elastic member (45) is engaged with the step of the first through hole (11).

5. The secondary battery top cap (100) according to claim 3, wherein the elastic member (45) comprises a body portion (451) and a protrusion portion (453) formed by extending one end of the body portion (451) downward, the protrusion portion (453) is provided between the rigid screw stopper (43) and the liquid injection hole (2), and the rigid screw stopper (43) comprises a head portion (431) abutting against the body portion (451) and a column portion (433) extending downward from the head portion (431) and screwed with the second through hole (31).

6. The secondary battery top cover (100) according to claim 1, wherein the top cover sheet (1) is provided with a first pole post unit (5) and a second pole post unit (6), the top cover sheet (1) is provided with a first lead-in hole (12), the first pole post unit (5) comprises a first pole post (51), a first sealing element (53), a first connecting element (55) and a first upper insulating element (57), the first pole post (51) penetrates through and is fixed in the first lead-in hole (12), the first sealing element (53) is arranged between the first pole post (51) and the top cover sheet (1), the first upper insulating element (57) is clamped to the top cover sheet (1), one end of the first connecting element (55) is clamped to the first upper insulating element (57), and the other end of the first connecting element is clamped to the first pole post (51).

7. The secondary battery top cap (100) according to claim 6, wherein the first connector (55) comprises a rigid portion (551) snapped to the first upper insulator (57) and an elastic portion (553) that is pressed by an external force to be snapped to the first pole (51).

8. The secondary battery top cap (100) according to claim 7, wherein the rigid portion (551) is a circular ring body, and the elastic portion (553) is a plurality of serrations formed and extended inwardly from the rigid portion (551).

9. The secondary battery top cover (100) according to claim 6, wherein the top cover piece (1) is further provided with a second lead-in hole (13), the second pole unit (6) comprises a second pole (61), a second sealing member (63), a second connecting member (65) and a second upper insulating member (67), the second pole (61) is arranged in the second lead-in hole (13) in a penetrating manner and fixed, the second sealing member (63) is arranged between the second pole (61) and the top cover piece (1), the second upper insulating member (67) is clamped to the top cover piece (1), one end of the second connecting member (65) is clamped to the second upper insulating member (67), and the other end of the second connecting member is clamped to the second pole (61).

10. A secondary battery comprising a battery cell, a casing for accommodating the battery cell, and a top cover for sealing the casing, wherein the top cover is the secondary battery top cover (100) according to any one of claims 1 to 9.