CN212485426U

CN212485426U - Battery top cap and battery cell

Info

Publication number: CN212485426U
Application number: CN202021214390.XU
Authority: CN
Inventors: 王先文; 苑丁丁; 吕正中
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-02-05
Anticipated expiration: 2030-06-28

Abstract

The utility model relates to a power battery technical field discloses a battery top cap and battery cell. The battery top cap includes a cover plate, a pole and a sealing assembly. A convex hull is integrally arranged on the first side surface of the cover plate, a mounting hole is formed in the convex hull, and an accommodating area is arranged on the hole wall of the mounting hole; the limit part is arranged on the periphery of the pole in a protruding mode, the pole penetrates through the mounting hole, and the limit part is clamped in the accommodating area; the sealing assembly comprises a sealing ring and a sealing element, the sealing ring is arranged between the limiting part and the cover plate, the sealing element seals a gap between the cover plate and the pole at the first side face of the cover plate and/or the second side face back to the first side face, and the two ends of the pole protrude out of the sealing assembly. The utility model discloses reduce the ageing speed of sealing washer, prolonged the life-span of sealing washer, guaranteed the sealing reliability between top cap and the utmost point post, reduced the cost of changing the sealing washer.

Description

Battery top cap and battery cell

Technical Field

The utility model relates to a power battery technical field especially relates to a battery top cap and battery cell.

Background

Lithium ion batteries have the characteristics of high power density, rapid charge and discharge, and long service life, have become the mainstream of the battery energy market at present, and are widely applied to the fields of automobile power devices, energy storage devices, electric tools, electronic and electric appliances, emergency equipment, military and the like. With the development of equipment, people put higher demands on the performance of the lithium ion battery, especially on the reliability, safety and use cost performance of the lithium ion battery.

In the battery top cap of the existing lithium ion battery, in order to guarantee the sealing effect between the upper pole column of the battery top cap and the top cap cover plate, a sealing ring is generally arranged in a gap between the pole column and the cover plate, and air, electrolyte or the air and the electrolyte enter the gap to contact with the sealing ring together, so that the sealing ring is corroded and oxidized, and the sealing ring is aged at an accelerated speed for a long time, thereby the service life of the sealing ring is shortened, and the sealing reliability between the top cap cover plate and the pole column is reduced.

Based on this, a battery top cover and a single battery are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery top cap and battery cell have reduced the ageing speed of sealing washer, have prolonged the life-span of sealing washer, have guaranteed the sealing reliability between apron and the utmost point post, have reduced the cost of changing the sealing washer.

To achieve the purpose, the utility model adopts the following technical proposal:

a battery top cap, comprising:

the first side surface of the cover plate is integrally provided with a convex hull, the convex hull is provided with a mounting hole, and the hole wall of the mounting hole is provided with an accommodating area;

the side of the pole is provided with a limiting part in a protruding mode, the pole penetrates through the mounting hole, and the limiting part is clamped in the accommodating area;

the sealing assembly comprises a sealing ring and a sealing element, the limiting portion is arranged between the cover plate and the sealing ring, the sealing element is arranged on the cover plate, the first side face and/or the second side face, back to the first side face, of the cover plate blocks a gap between the cover plate and the pole columns, and the two ends of the pole columns protrude out of the sealing assembly.

Preferably, the sealing element comprises a first injection molding body, and the first injection molding body is arranged on one side, facing the convex hull top surface, of the sealing ring and between the convex hull and the pole.

Preferably, one end of the first injection molded body extends to the first side of the cover plate.

Preferably, the battery top cover further includes a supporting member disposed on a bottom surface of the convex hull connected to the second side surface of the cover plate, the supporting member and the bottom surface of the convex hull forming the receiving area therebetween.

Preferably, the sealing element further comprises a second injection molding body, and the second injection molding body is arranged on one side, opposite to the top surface of the convex hull, of the sealing ring and between the support piece and the pole.

Preferably, the battery top cap still includes the insulating layer, the insulating layer set up in the apron the second side, just be equipped with on the insulating layer and supply the through-hole that utmost point post passed.

Preferably, the battery top cap further comprises a liquid injection hole, and a liquid injection sealing member is plugged in the liquid injection hole.

Preferably, the battery top cover further comprises an explosion-proof valve disposed on the cover plate.

A single battery comprises the battery top cover and the shell, wherein the shell is provided with an opening, the cover plate is plugged in the opening, and a battery core is arranged in a cavity defined by the shell and the battery top cover and is connected with the pole.

Preferably, the inside cavity of shell just the opening is provided with two, two the opening set up respectively in the both ends of shell, two battery top cap shutoff respectively in the opening, two battery top cap the utmost point post is anodal utmost point post and negative pole utmost point post respectively.

The utility model has the advantages that:

be provided with the convex closure on the apron, offer the mounting hole that is used for installing utmost point post on the convex closure, the protruding spacing portion of establishing in week side of utmost point post, utmost point post wear to locate in the mounting hole and spacing portion joint holds the district on the mounting hole pore wall, with the stable installation of utmost point post on the apron. The convex hull and the cover plate are integrally arranged, so that the number of parts and the assembly process of the cover plate can be reduced, the processing difficulty is reduced, the pole can be quickly and accurately installed, and the time cost is reduced. The sealing assembly is arranged, so that the sealing effect is achieved between the cover plate and the pole, and the waterproof and dustproof functions of the battery top cover are also achieved. The sealing assembly comprises a sealing piece and a sealing ring, the sealing ring is arranged between the limiting part and the cover plate, the sealing ring is arranged to prevent electrolyte from leaking, the sealing performance of the top cover of the battery is improved, and the safety of the battery is also improved. The sealing member can separate the sealing ring from air, electrolyte or both at the first side of the cover plate and/or the second side of the cover plate back to the first side to plug the gap between the cover plate and the pole, so that the aging speed of the sealing ring is reduced, the service life of the sealing ring is prolonged, the sealing reliability between the cover plate and the pole is further improved, and the cost for replacing the sealing ring is reduced. The both ends protrusion of utmost point post sets up in seal assembly for utmost point post is convenient for and is located the metal sheet and the welding of electric core utmost point ear of battery top cap both sides respectively, has avoided setting up other adapting unit between metal sheet or electric core utmost point ear and utmost point post, has simplified the structure, has saved the cost.

Drawings

Fig. 1 is a cross-sectional view of a battery top cover according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a cross-sectional view of a battery top cap according to a second embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

fig. 5 is a schematic structural diagram of a single battery provided in the third embodiment of the present invention;

fig. 6 is a schematic structural diagram of a battery module according to a third embodiment of the present invention.

In the figure:

100. a single battery;

10. a battery top cover; 20. a housing;

1. a cover plate; 11. a convex hull;

2. a pole column; 21. a limiting part;

3. a seal assembly; 31. a seal ring; 32. a seal member; 321. a first injection molded body; 322. a second injection molded body;

4. a support member;

5. an insulating layer;

6. a liquid injection hole;

7. an explosion-proof valve.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

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 being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely 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.

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

Example one

At present, a sealing ring is generally arranged in a gap between the pole and the cover plate, and air, electrolyte or the air and the electrolyte enter the gap to contact the sealing ring together, so that the sealing ring is corroded and oxidized, the aging of the sealing ring is accelerated as time passes, the service life of the sealing ring is shortened, and the sealing reliability between the top cover plate and the pole is reduced.

For solving the above problem, this embodiment provides a battery top cap, has reduced the ageing speed of sealing washer, has prolonged the life-span of sealing washer, has guaranteed the sealing reliability between apron and the utmost point post, has reduced the cost of changing the sealing washer.

Specifically, as shown in fig. 1-2, the battery top cap 10 includes a cap plate 1, a post 2, and a seal assembly 3. The first side of apron 1 an organic whole is provided with convex closure 11, has seted up the mounting hole on the convex closure 11, is equipped with on the pore wall of mounting hole and holds the district. The week side protrusion of utmost point post 2 is equipped with spacing portion 21, and utmost point post 2 wears to locate in the mounting hole, and spacing portion 21 joint is in holding the district. The sealing assembly 3 comprises a sealing ring 31 and a sealing element 32, the sealing ring 31 is arranged between the limiting part 21 and the cover plate 1, the sealing element 32 seals a gap between the cover plate 1 and the pole 2 at the first side surface of the cover plate 1 and/or the second side surface opposite to the first side surface, and the two ends of the pole 2 protrude out of the sealing assembly 3. The accommodating area is arranged to stably install the pole 2 on the cover plate 1. The convex hull 11 and the cover plate 1 are integrally arranged, so that the number of parts and the assembly process of the cover plate 1 can be reduced, the processing difficulty is reduced, meanwhile, the pole 2 can be quickly and accurately installed, and the time cost is reduced. Set up seal assembly 3, play sealed effect between apron 1 and utmost point post 2, also realized the waterproof dirt-proof function of battery top cap 10. The sealing assembly 3 comprises a sealing element 32 and a sealing ring 31, the sealing ring 31 is arranged between the limiting part 21 and the cover plate 1, the sealing ring 31 is arranged to prevent electrolyte from leaking, the sealing performance of the battery top cover 10 is improved, and the safety of the battery is also improved. The sealing element 32 seals a gap between the cover plate 1 and the pole 2 at the first side surface of the cover plate 1 and/or the second side surface back to the first side surface, so that the sealing ring 31 can be separated from air, electrolyte or both, the aging speed of the sealing ring 31 is reduced, the service life of the sealing ring 31 is prolonged, the sealing reliability between the cover plate 1 and the pole 2 is further improved, and the cost for replacing the sealing ring 31 is reduced. The both ends protrusion in seal assembly setting of utmost point post 2 for utmost point post 2 is convenient for and is located the metal sheet and the welding of electric core utmost point ear of battery top cap 10 both sides respectively, has avoided setting up other adapting unit between metal sheet or electric core utmost point ear and utmost point post 2, has simplified the structure, has saved the cost.

In the present embodiment, the cover plate 1 is manufactured by a stamping process. The pole 2 is manufactured by adopting a stamping process. In other embodiments, the cover plate 1 and the pole post 2 may be manufactured by other processes, such as a process of stretching a partial structure, which is not limited herein.

In this embodiment, a limiting portion 21 is protruded from the sidewall of the post 2. The cross section of the pole 2 can be circular, kidney-shaped, quadrilateral, etc.

Further, the battery top cover 10 further includes a support member 4, the support member 4 is disposed on a bottom surface of the convex hull 11 connected to the second side surface of the cover plate 1, and a receiving area is formed between the support member 4 and the bottom surface of the convex hull 11. Set up support piece 4 and can support utmost point post 2, can prevent 2 drunkenness of utmost point post, form the district that holds that is used for spacing portion 21 of joint moreover between support piece 4 and the bottom surface of convex closure 11 to press spacing portion 21 to the bottom surface of convex closure 11, guaranteed utmost point post 2 can the joint inside holding the district, further guaranteed battery top cap 10's sealing performance.

In the present embodiment, the supporting member 4 is welded to the bottom surface of the convex hull 11, so that the supporting performance of the supporting member 4 and the stable connection between the supporting member and the cover plate 1 can be ensured. The mounting hole is provided with a first communicating hole and a second communicating hole along the circumferential direction, the mounting hole, the first communicating hole and the second communicating hole are sequentially communicated with each other from a first side surface of the cover plate 1 to a second side surface of the cover plate 1, the radius of the first communicating hole is larger than that of the mounting hole, the radius of the second communicating hole is larger than that of the first communicating hole, a first step surface is formed between the mounting hole and the first communicating hole, and a second step surface is formed between the first communicating hole and the second communicating hole. The support member 4 is welded on the second step surface, an accommodating area is formed between the support member 4 and the first step surface, and the thickness of the battery top cover 10 can be reduced by welding the support member 4 on the second step surface, so that the compactness of the structure is improved.

In the present embodiment, the seal ring 31 is provided between the hole wall of the first communication hole, the stopper portion 21, and the support body 4.

Preferably, the sealing element 32 comprises a first injection-molded body 321, and the first injection-molded body 321 is arranged between the convex hull 11 and the pole post 2 and on the side of the sealing ring 31 facing the top surface of the convex hull 11. The first injection molding body 321 is arranged, so that air is prevented from contacting the sealing ring 31, and the sealing performance is improved. When apron 1 installs on the battery cell, first side is towards the battery cell outside, and convex closure 11 is towards the battery cell outside, and first injection molding 321 can separate sealing washer 31 and the air in the apron 1 outside, has reduced the ageing speed of sealing washer 31, has prolonged the life-span of sealing washer 31, has further improved the sealing reliability between apron 1 and the utmost point post 2, has reduced the cost of changing sealing washer 31.

In this embodiment, first injection molding body 321 is through injection moulding, and first injection molding body 321 adopts engineering plastic PPS material, and the dimensional stability and the chemical stability of this material are higher, have guaranteed the corrosion resisting property of first injection molding body 321 to the leakproofness of battery top cap 10 has been guaranteed.

Further, one end of the first injection molding body 321 extends to the first side surface of the cover plate 1, that is, the first injection molding body 321 covers the convex hull 11 and extends to the first side surface, so that the connection area between the first injection molding body 321 and the cover plate 1 is increased, the connection strength is improved, and the effect of protecting the convex hull 11 is also achieved. In this embodiment, the terminal post 2 protrudes from the first injection molding body 321, so that convenience in welding the terminal post 2 is improved.

Preferably, the battery top cover 10 further includes an insulating layer 5, the insulating layer 5 is disposed on the second side surface of the cover plate 1, and the insulating layer 5 is provided with a through hole for the terminal 2 to pass through. The insulating layer 5 is arranged, so that insulation between the battery core and the cover plate 1 can be guaranteed, and the safety of the battery is guaranteed.

In this embodiment, the insulating layer 5 extends towards the pole 2 and is connected to the support 4. The insulating layer 5 is welded to the cover plate 1 and the support 4.

In the present embodiment, the pole post 2 is disposed protruding from the insulating layer 5 and the supporting member 4 toward the second side surface of the cover plate 1.

Example two

This embodiment is a further improvement of the first embodiment, and in addition to the components described in the first embodiment, it is preferable that, as shown in fig. 3 to 4, the sealing element 32 further includes a second injection molded body 322, and the second injection molded body 322 is disposed between the support member 4 and the pole post 2 and a side of the sealing ring 31 opposite to the top surface of the convex hull 11. The sealing connection between the support piece 4 and the pole 2 is realized, and the sealing reliability between the cover plate 1 and the pole 2 is improved. The sealing ring 31 is sealed in the gap between the cover plate 1 and the pole 2 in two directions, so that the sealing ring 31 is separated from air and electrolyte, the electrolyte corrosion of the sealing ring 31 can be further prevented, the aging speed of the sealing ring 31 is further reduced, the service life of the sealing ring 31 is prolonged, the sealing reliability between the cover plate 1 and the pole 2 is further improved, and the cost for replacing the sealing ring 31 is reduced.

In the present embodiment, the seal ring 31 is provided between the first step surface and the stopper portion 21.

In this embodiment, the second injection molding body 322 is through injection molding, and the second injection molding body 322 adopts engineering plastic PPS material, and the dimensional stability and the chemical stability of this material are higher, have guaranteed the corrosion resisting property of the second injection molding body 322 to the leakproofness of battery top cap 10 has been guaranteed.

Preferably, as shown in fig. 3, the battery top cover 10 further includes a pour hole 6. The liquid injection hole 6 is plugged with a liquid injection sealing piece. When battery top cap 10 lid was located on the battery cell, annotate liquid hole 6 and be used for to the inside injection electrolyte of battery cell, when need not inwards inject electrolyte, annotate liquid hole 6 shutoff and have annotated the liquid sealing member, the effectual electrolyte that has prevented leaks outward, has improved the reliable type of sealing.

In this embodiment, the liquid injection sealing member is a sealing nail welded in the liquid injection hole 6.

Preferably, the battery top cover 10 further includes an explosion-proof valve 7, and the explosion-proof valve 7 is provided on the cover plate 1. When the air pressure on the inner side of the top cover exceeds the normal range, the explosion-proof valve 7 can be exploded and releases pressure, and the safety is improved.

For ease of understanding, the present embodiment provides the following steps for mounting the battery top cover 10:

first, the packing 31 is fitted over the stopper portion 21. Next, the post 2 is abutted against the bottom surface of the convex hull 11. Again, the support body 4 is welded to the second step surface. Then, injection molding of the first injection-molded body 321 and the second injection-molded body 322 is completed. Finally, the insulating layer 5 is welded to the second side of the cover plate 1.

EXAMPLE III

The present embodiment provides a unit battery 100. As shown in fig. 5, includes the battery top cover 10 and the housing 20 as described above. The shell 20 is provided with an opening, the cover plate 1 is sealed and plugged in the opening, and the battery core is arranged in a cavity enclosed by the shell 20 and the battery top cover 10 and connected to the pole 2. The service life of the sealing ring 31 can be prolonged by using the battery top cover 10, the sealing reliability between the cover plate 1 and the pole 2 is ensured, and the cost for replacing the sealing ring 31 is reduced.

In this embodiment, the cover plate 1 of the top cap 10 is welded to the opening, so that the connection strength between the top cap 10 and the housing 20 is improved. The cell tab inside the battery cell 100 is welded to the terminal post 2. The first side of the cap plate 1 faces the outside of the unit battery 100, and the second side of the cap plate 1 faces the inside of the unit battery 100.

Preferably, the casing 20 is hollow and has two openings, the two openings are respectively disposed at two ends of the casing 20, the two battery top covers 10 are respectively plugged in the openings, and the poles 2 of the two battery top covers 10 are respectively a positive pole and a negative pole. The shell 20 is the tubulose of both ends open-ended, and the utmost point post 2 that sets up on the battery top cap 10 of its both ends shutoff is anodal utmost point post and negative pole post respectively, and inside the shell 20 was arranged in to the electric core, the anodal utmost point ear welding of electric core was on anodal utmost point post, and the welding of negative pole utmost point ear is on negative pole post. In the present embodiment, aluminum is used as the material of the outer case 20, and the outer case 20 having a tubular structure is formed by a process of heating an aluminum ingot and extruding, and is cut at a desired length of the unit cell 100. The shell 20 manufactured by the extrusion process can simplify the processing process of the shell 20, reduce time cost, enlarge the thickness and length ranges of the shell 20, avoid the limitation of the bending process in the traditional processing process on the thickness and length of the shell 20, and further reduce cost.

Preferably, each unit cell 100 is provided with at least one explosion-proof valve 7 and one liquid injection hole 6. In the present embodiment, the explosion-proof valve 7 and the liquid injection hole 6 are provided in the battery top cover 10 at the positive electrode of the unit battery 100, and the explosion-proof valve 7 and the liquid injection hole 6 are not provided in the battery top cover 10 at the negative electrode of the unit battery 100.

For ease of understanding, the present embodiment provides the following steps of mounting the unit battery 100:

first, the outer case 20, which has an appropriate thickness and length, and the battery top cap 10 matched thereto are manufactured according to the requirements of the unit battery 100. And secondly, welding a positive electrode lug with a positive electrode pole, and welding a negative electrode lug with a negative electrode pole. Then, the battery top caps 10 of the positive and negative electrodes are welded to both ends of the can 20. Finally, the electrolyte is injected into the single battery 100 from the injection hole 6, and the injection hole 6 is blocked.

A battery module composed of the unit batteries 100 provided in the present embodiment is shown in fig. 6. When the unit batteries 100 are connected, a plurality of unit batteries 100 are connected in parallel or in series to form a battery module.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery top cap, comprising:

the cover plate comprises a cover plate (1), wherein a convex hull (11) is integrally arranged on a first side surface of the cover plate (1), a mounting hole is formed in the convex hull (11), and an accommodating area is arranged on the wall of the mounting hole;

the terminal post (2) is provided with a limiting part (21) in a protruding mode on the peripheral side of the terminal post (2), the terminal post (2) penetrates through the mounting hole, and the limiting part (21) is clamped in the accommodating area;

seal assembly (3), seal assembly (3) include sealing washer (31) and sealing member (32), spacing portion (21) with set up between apron (1) sealing washer (31), sealing member (32) are in apron (1) first side and/or carry on the back of the body in the second side shutoff of first side apron (1) with the gap between utmost point post (2), just utmost point post (2) both ends protrusion in seal assembly (3) set up.

2. Cell top cover according to claim 1, characterized in that the sealing element (32) comprises a first injection-molded body (321), the first injection-molded body (321) being arranged between the male closure (11) and the pole (2) on the side of the sealing ring (31) facing the top surface of the male closure (11).

3. Battery top cover according to claim 2, characterized in that one end of the first injection molded body (321) extends to the first side of the cover plate (1).

4. The battery top cover according to claim 1, wherein the battery top cover (10) further comprises a support member (4), the support member (4) being arranged on a bottom surface of the convex hull (11) in connection with the second side of the cover plate (1), the support member (4) and the bottom surface of the convex hull (11) forming the receiving area therebetween.

5. The battery top cap according to claim 4, characterized in that the sealing element (32) further comprises a second injection-molded body (322), the second injection-molded body (322) being arranged between the support (4) and the pole (2) and on the side of the sealing ring (31) facing away from the top surface of the convex hull (11).

6. The battery top cap according to claim 1, wherein the battery top cap (10) further comprises an insulating layer (5), the insulating layer (5) is disposed on the second side surface of the cover plate (1), and a through hole for the pole (2) to pass through is disposed on the insulating layer (5).

7. The battery top cap according to claim 1, characterized in that the battery top cap (10) further comprises a liquid injection hole (6), and the liquid injection hole (6) is sealed by a liquid injection sealing member.

8. The battery top cap according to claim 1, wherein the battery top cap (10) further comprises an explosion-proof valve (7), the explosion-proof valve (7) being provided on the cap plate (1).

9. A single battery, which is characterized by comprising the battery top cover (10) and the outer shell (20) according to any one of claims 1 to 8, wherein the outer shell (20) is provided with an opening, the cover plate (1) is sealed at the opening, and a battery cell is arranged in a cavity enclosed by the outer shell (20) and the battery top cover (10) and connected to the pole (2).

10. The single battery according to claim 9, wherein the housing (20) is hollow and the number of the openings is two, the two openings are respectively disposed at two ends of the housing (20), the two battery top covers (10) are respectively plugged at the openings, and the poles (2) of the two battery top covers (10) are respectively a positive pole and a negative pole.