CN216698529U

CN216698529U - Secondary battery top cap and secondary battery thereof

Info

Publication number: CN216698529U
Application number: CN202123433214.2U
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 comprises a top cover plate, a first pole column unit and a second pole column unit, the first pole column unit and the second pole column unit are connected with the top cover plate, 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 riveting block 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 riveting block is arranged at the top of the first pole column in a surrounding mode and clamped and provided with the first upper insulating element between the first pole column and the top cover plate, a first through hole penetrating through the first pole column in the vertical direction and used for liquid injection is arranged in the middle of the first pole column, and a sealing assembly in threaded connection is arranged in the first through hole. Will annotate liquid hole and first utmost point post and combine as an organic wholely, it can avoid setting up the top cover piece thick in order to satisfy the required intensity of top cover piece when annotating the liquid, and seal assembly is the threaded connection of can dismantling the mode, and the instant tear open promptly can improve and annotate liquid efficiency.

Description

Secondary battery top cap and secondary battery 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 sheet of the secondary battery is usually provided with a positive electrode introduction hole, a negative electrode introduction hole, a liquid injection hole and an explosion-proof valve hole, and the liquid injection hole and the explosion-proof valve hole occupy a lot of space, so that the available sizes of the positive electrode pole and the negative electrode pole are reduced. In addition, the clamp of the liquid injection machine is usually pressed on the top cover plate during liquid injection, so the top cover plate is not suitable to be arranged too thin to avoid insufficient strength, but the arrangement is not suitable for the requirement of thinning the secondary battery at present. And, need inject into electrolyte in the battery case through annotating the liquid hole during production at present, then weld sealed nail on annotating the liquid 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. When injecting liquid, need carry out the evacuation to battery case earlier, just can inject 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, the secondary battery top cover combines a liquid injection hole and a first pole into a whole, the secondary battery top cover can avoid the need of setting a thicker top cover plate to meet the strength required by the top cover plate during liquid injection, a sealing assembly is in threaded connection with a through hole to avoid adverse effects generated by welding of a sealing nail, and meanwhile, the threaded connection is detachable, namely, the secondary battery top cover can be detached immediately after use, so that the liquid injection efficiency can be improved.

To achieve the above object, a first aspect of the present invention provides a secondary battery top cap comprising: the top cover piece, connect the first utmost point post unit and the second utmost point post unit of top cover piece, the top cover piece is equipped with the first hole of introducing, first utmost point post unit includes first utmost point post, first sealing member, first riveting piece and the first insulating part of going up, first utmost point post is worn to establish and is fixed in the first hole of introducing, first sealing member is in first utmost point post with between the top cover piece, first riveting piece encloses to be located the top of first utmost point post and with the joint is equipped with between the top cover piece the first insulating part of going up, the middle part of first utmost point post is equipped with and runs through its first through-hole that itself just is used for annotating along upper and lower direction, be equipped with threaded connection's seal assembly in the first through-hole.

Compared with the prior art, the secondary battery top cover has the advantages that the first through hole penetrating through the first pole along the vertical direction is formed in the middle of the first pole, and the first through hole serves as the liquid injection hole, so that the liquid injection hole and the first pole are combined into a whole, and the top cover plate can be prevented from being thick to meet the strength required by the top cover plate during liquid injection. Be equipped with threaded connection's seal assembly in the through-hole, can avoid sealed nail welding produced harmful effects, threaded connection is detachable mode simultaneously, promptly tears open promptly, can improve and annotate liquid efficiency.

The better, seal assembly including the joint in elastic component and butt in the first through-hole the rigidity end cap on elastic component upper portion, the elastic component can play the cushioning effect, and annotate the liquid needle of liquid machine can pierce through the elastic component and stretch into in the battery case when annotating the liquid, the elastic component with annotate liquid needle tube outer wall and be in encapsulated situation all the time, after annotating the liquid end and extracting notes liquid needle tube, the puncture pinhole on the elastic component can automatic closure to can be better avoid electrolyte spill. The rigid plug can play a role in protecting the elastic part so as to prevent foreign objects from damaging and failing to play a sealing role. The elastic member is preferably made of rubber.

Preferably, the peripheral wall of the first through hole is provided with an internal thread, the rigid plug is a screw plug which is connected with the internal thread in a matching manner, the lower end of the screw plug is abutted against the elastic piece, and the upper part of the rigid plug is connected with the peripheral wall of the first through hole in a threaded manner, so that the connection firmness is improved.

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 abuts against the step of the first through hole.

Preferably, the sealing assembly comprises a rigid plug in threaded connection with the first through hole, a protruding portion is arranged below the rigid plug, and an elastic piece is arranged around the protruding portion.

Preferably, the upper surface of first riveting piece is higher than the upper surface of first utmost point post, just first riveting piece with first utmost point post encloses into one and holds the chamber, holds the chamber and can prevent to annotate liquid when liquid pollutes the top sheet, and can provide operation platform so that annotate the liquid.

Preferably, a first connecting piece is fixedly arranged at the bottom of the first pole column, a second through hole penetrating through the first through hole is formed in the first connecting piece, and the first connecting piece can be welded and fixed with the bottom of the first pole column and is used for being connected with a first pole piece in the battery core.

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 riveting block and a second upper insulating element, the second pole column penetrates through and is fixed to the second introduction hole, the second sealing element is arranged between the second pole column and the top cover plate, and the second riveting block is arranged at the top of the second pole column in a surrounding mode and is connected with the top cover plate in a clamping mode to form the second upper insulating element.

The utility model 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 of the secondary battery is integrated with the first pole, so that the top cover plate is prevented from being thick to meet the strength required by the top cover plate during liquid injection, and the sealing assembly is detachable, namely 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 one embodiment of a top cap for a secondary battery according to the present invention.

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

Fig. 4 is an exploded view of the top cap of the secondary battery according to the present invention in one direction.

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

Fig. 6 is an enlarged view of a portion a of fig. 3.

Fig. 7 is a first variation of fig. 6.

Fig. 8 is a second variation of fig. 6.

Fig. 9 is a third variation of fig. 6.

Fig. 10 is an enlarged view of a portion B in fig. 3.

Fig. 11 is an enlarged view of the seal assembly.

Description of the elements

100-secondary battery top cover; 1-top cover sheet; 11-a first lead-in hole; 13-a second inlet hole; 15-explosion-proof valve mounting holes; 2-a first pole unit; 21-a first pole; 211 — a first via; 211 a-internal thread; 23-a first seal; 25-a first riveting block; 25 a-a receiving cavity; 27-a first upper insulator; 29-a first connecting tab; 291-second via hole; 3-a second pole column unit; 31-a second pole; 33-a second seal; 35-a second riveting block; 37-a second upper insulator; 39-a second connecting sheet; 4-a sealing assembly; 41-an elastic member; 43-rigid plug; 431-a boss; 5-a lower insulator; 6-an explosion-proof valve assembly; 61-explosion-proof valve; 63-explosion-proof valve protection sheet

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 10, 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 2, a second pole unit 3, and an explosion-proof valve assembly 6 disposed on the top cap plate 1. The top cover plate 1 is provided with a first lead-in hole 11, a second lead-in hole 13 and an explosion-proof valve mounting hole 15, the first lead-in hole 11 is connected with the first pole unit 2, and the second lead-in hole 13 is connected with the second pole unit 3. The explosion-proof valve assembly 6 comprises an explosion-proof valve 61 and an explosion-proof valve protecting piece 63, the explosion-proof valve 61 is arranged in the explosion-proof valve mounting hole 15, and the explosion-proof valve protecting piece 63 is arranged above the explosion-proof valve 61. A lower insulator 5 is provided below the top cover plate 1 to electrically insulate the top cover plate 1 from the cells in the housing.

As shown in fig. 1 to 11, the first pole unit 2 includes a first pole 21, a first sealing member 23, a first riveting block 25 and a first upper insulating member 27, the first pole 21 is inserted into and fixed to the first introduction hole 11, the first sealing member 23 is disposed between the first pole 21 and the top cover plate 1, the first riveting block 25 surrounds the top of the first pole 21 and is clamped with the top cover plate 1 to form the first upper insulating member 27, a first through hole 211 penetrating through the first pole 21 in the vertical direction and used for injecting liquid is formed in the middle of the first pole 21, and a sealing assembly 4 connected by threads is disposed in the first through hole 211. Compared with the prior art, will annotate liquid hole and first utmost point post 21 and combine as an organic wholely, it can avoid setting up top cover plate 1 thick in order to satisfy the required intensity of top cover plate 1 when annotating liquid, is equipped with threaded connection's seal assembly 4 in the first through-hole 211, can avoid the produced harmful effects of sealed nail welding, and threaded connection is detachable mode simultaneously, tears open promptly, can improve and annotate liquid efficiency.

As further shown in fig. 6 and 11, the sealing assembly 4 includes an elastic member 41 clamped in the first through hole 211 and a rigid plug 43 abutted to the upper portion of the elastic member 41, the elastic member 41 can play a role in buffering, and the injection needle of the injection machine can pierce through the elastic member 41 and extend into the battery case during injection, the elastic member 41 and the outer wall of the injection needle tube are always in a sealing state, and after the injection needle tube is pulled out after injection is finished, the piercing needle hole on the elastic member 41 can be automatically closed, so that the electrolyte can be better prevented from splashing. The rigid plug 43 may serve to protect the elastic member from being damaged by foreign objects and thus may not function as a seal. The elastic member 41 is preferably made of rubber. The peripheral wall of the first through hole 211 is provided with an internal thread 211a, the rigid plug 43 is a screw plug which is connected with the internal thread 211a in a matching way, the lower end of the screw plug is abutted against the elastic piece 41, and the upper part of the screw plug is connected with the peripheral wall of the first through hole 311 in a threaded way, so that the connection firmness is improved. The first through hole 211 is a stepped hole, the aperture of the upper portion is larger than that of the lower portion, and the elastic member 41 abuts against the step of the first through hole 211.

Of course, the sealing assembly 4 may have other structures, as shown in fig. 7 to 9, the sealing assembly 4 includes a rigid plug 43 screwed with the first through hole 211, a protrusion 431 is disposed below the rigid plug 43, and the elastic member 41 is surrounded by the protrusion 431. The elastic member 41 mainly plays a role of buffering below the rigid plug 43. The elastic member 41 can be engaged with the protrusion 431 as shown in fig. 7 and abut against the upper portion of the stepped hole of the first through hole 211. As shown in fig. 8, the elastic element 41 may be a ring structure, and is abutted against the upper portion of the stepped hole of the first through hole 211 and sleeved outside the protrusion 431. Alternatively, as shown in fig. 9, the upper portion of the elastic member 41 is larger than the lower portion thereof to form a stepped hole having a stepped portion to be engaged with the first through hole 211.

As further shown in fig. 4 and 6, the upper surface of the first riveting block 25 is higher than the upper surface of the first electrode post 21, and the first riveting block 25 and the first electrode post 21 are enclosed to form an accommodating cavity 25a, the accommodating cavity 25a can prevent liquid from polluting the top cover plate 1 during liquid injection, and an operating platform can be provided to facilitate liquid injection. The bottom of the first pole column 21 is fixedly provided with a first connecting sheet 29, the first connecting sheet 29 is provided with a second through hole 291 penetrating through the first through hole 211, and the first connecting sheet 29 can be welded and fixed with the bottom of the first pole column 21 and is used for being connected with a first pole piece in a battery cell.

The second pole cell 3 may have a similar structure as the first pole cell 2, the main difference being that there is no first through hole 211 in the pole that runs through it. As shown in fig. 10, the second pole unit 3 includes a second pole 31, a second sealing member 33, a second riveting block 35 and a second upper insulating member 37, the second pole 31 is inserted into and fixed to the second introducing hole 13, the second sealing member 33 is interposed between the second pole 31 and the top cover plate 1, and the second riveting block 35 is enclosed on the top of the second pole 31 and is provided with the second upper insulating member 37 in a clamping manner with the top cover plate 1. A second connecting piece 39 is fixedly arranged at the bottom of the second pole column 31, and the second connecting piece 39 can be fixedly welded with the bottom of the second pole column 31 and is used for being connected with a second pole piece in the battery core.

Further, lower insulating parts 5 are arranged between the top cover plate 1 and the first pole column 21 and between the top cover plate 1 and the second pole column 31, and the lower insulating parts 5 are clamped and fixed on the first pole column 21 and the second pole column 31.

It should be noted that 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. The first upper insulator 27 and the second upper insulator 37 may be injection molded during installation, or may be extrusion molded before installation, and have a certain elastic modulus and a certain deformation.

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. A secondary battery top cap (100), comprising: the top cover plate (1), connect first utmost point post unit (2) and second utmost point post unit (3) of top cover plate (1), top cover plate (1) is equipped with the first hole (11) of introducing, first utmost point post unit (2) include first utmost point post (21), first sealing member (23), first riveting piece (25) and first last insulating part (27) of introducing, first utmost point post (21) wear to establish and are fixed in first hole (11) of introducing, first sealing member (23) are in between first utmost point post (21) and top cover plate (1), first riveting piece (25) enclose locate the top of first utmost point post (21) and with the joint is equipped with first last insulating part (27) between top cover plate (1), its characterized in that, the middle part of first notes utmost point post (21) is equipped with runs through itself and be used for first through-hole (211) along upper and lower direction, and a sealing assembly (4) in threaded connection is arranged in the first through hole (211).

2. The secondary battery top cap (100) according to claim 1, wherein the sealing assembly (4) comprises an elastic member (41) snapped into the first through hole (211) and a rigid stopper (43) abutting against an upper portion of the elastic member (41).

3. The secondary battery top cap (100) according to claim 2, wherein the peripheral wall of the first through hole (211) is provided with an internal thread (211a), and the rigid plug (43) is a screw plug fittingly connected with the internal thread.

4. The secondary battery top cap (100) according to claim 2, wherein the first through hole (211) is a stepped hole, and the hole diameter of the upper portion is larger than that of the lower portion, and the elastic member (41) abuts at the step of the first through hole (211).

5. The secondary battery top cap (100) according to claim 1, wherein the sealing assembly (4) comprises a rigid plug (43) in threaded connection with the first through hole (211), a protrusion (431) is arranged below the rigid plug (43), and the protrusion (431) is surrounded by an elastic member (41).

6. The secondary battery top cover (100) according to claim 1, wherein the upper surface of the first riveting block (25) is higher than the upper surface of the first electrode post (21), and the first riveting block (25) and the first electrode post (21) enclose into a containing cavity.

7. The secondary battery top cap (100) according to claim 1, wherein a first connection piece (29) is fixedly arranged at the bottom of the first pole (21), and the first connection piece (29) is provided with a second through hole (291) penetrating through the first through hole (211).

8. The secondary battery top cover (100) according to claim 1, wherein a lower insulating member (5) is arranged between the top cover sheet (1) and the first pole (21), and the lower insulating member (5) is clamped and fixed on the first pole (21).

9. The secondary battery top cover (100) according to claim 1, wherein the top cover sheet (1) is further provided with a second lead-in hole (13), the second pole unit (3) comprises a second pole (31), a second sealing member (33), a second riveting block (35) and a second upper insulating member (37), the second pole (31) is arranged in the second lead-in hole (13) in a penetrating manner and fixed, the second sealing member (33) is arranged between the second pole (31) and the top cover sheet (1), and the second riveting block (35) is arranged at the top of the second pole (31) in a surrounding manner and clamped with the second upper insulating member (37) between the top cover sheet (1).

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.