CN219371173U

CN219371173U - Cover plate and battery

Info

Publication number: CN219371173U
Application number: CN202320937362.8U
Authority: CN
Inventors: 窦俊青; 肖湘; 娄佳训; 李文俊; 赵云; 张实景; 俞会根
Original assignee: Weilan Haibo Zibo New Energy Technology Co ltd
Current assignee: Weilan Haibo Zibo New Energy Technology Co ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2023-07-18
Anticipated expiration: 2033-04-24

Abstract

The utility model relates to the field of batteries, and discloses a cover plate and a battery. The cover plate comprises a top cover and a pole column body, wherein a pole column hole is formed in the top cover; the pole body comprises a pole body, a first limiting plate and a second limiting plate, an annular clamping groove is formed between the first limiting plate and the second limiting plate, and the pole body is hollow and provided with an opening. The battery comprises the cover plate. The pole body is arranged on the top cover through the first limiting plate and the second limiting plate, so that the fixing effect of the pole body can be ensured, the inside of the pole body is provided with a hollow structure, the connecting sheet can extend into the inside of the pole body to be connected with the pole body in a welding way, the space utilization rate in the battery shell is improved, meanwhile, the quality of the pole body is smaller, and the energy density of the battery can be effectively improved; the pole body can be manufactured in a stamping mode, the process is simple, the efficiency is high, high energy consumption processes such as friction welding and finish machining are not needed, and the manufacturing cost of the pole body can be remarkably reduced.

Description

Cover plate and battery

Technical Field

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

Background

The lithium ion battery is a battery system with the best comprehensive performance at present, and has the characteristics of high specific energy, long cycle life, small volume, light weight, no memory effect, no pollution and the like, so the lithium ion battery is rapidly developed into a new generation of energy storage power supply and is widely applied to the fields of information technology, electric vehicles, hybrid vehicles, aerospace and the like. The square battery is used as one of three packaging (square, soft package and cylindrical) forms of the power battery, and has the advantages of high packaging reliability, high energy efficiency of the system, simpler structure, large single capacity, relatively simple system constitution, lower cost and the like. With the rapid development of the electric automobile industry, as a power source, the energy density requirement of the lithium ion battery is continuously and greatly increased; on the other hand, with the great rise of the raw material cost, the cost pressure of the battery is increased.

In the prior art, two modes of assembling the pole assembly and the top cover sheet are available. One is an injection molding process, in which PPS material is filled between a pole and a cap sheet at a high temperature higher than the melting temperature of polyphenylene sulfide (PPS), and the pole is assembled after cooling. The other is a riveting process, and the pole assembly and the top cover sheet are assembled together through a press riveting process. Although the two structures are different in the assembly modes of the pole body and the top cover sheet, the same point is that the manufacturing process of the pole body needs a large amount of machining operation, on one hand, a large amount of waste materials can be generated, and on the other hand, the manufacturing process is long in time and high in energy consumption; in particular, the negative electrode post is subjected to a friction welding process, which results in an increase in the manufacturing cost of the post. In addition, the assembly mode of current battery apron is in order to guarantee sufficient riveting intensity, needs to use thicker structural support piece to lead to the quality of utmost point post bigger, high more, increase space occupation, be unfavorable for the promotion of battery energy density.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the existing manufacturing process of the polar column needs a large amount of machining, more waste materials are generated, the manufacturing period is long, the energy consumption is high, the manufacturing cost is increased, the quality of the polar column is large, the occupied space is increased, and the improvement of the energy density of the battery is not facilitated.

In order to solve the above technical problems, the present utility model provides a cover plate, including:

a top cover provided with a pole hole; and

the pole body comprises a pole body penetrating through the pole hole, a first limiting plate and a second limiting plate are respectively arranged at two ends of the pole body, and an annular clamping groove matched with the top cover in a clamping manner is formed between the first limiting plate and the second limiting plate;

the pole body is hollow, and one end provided with the second limiting plate is provided with an opening.

Optionally, the cover plate further includes an insulating spacer disposed between the first limiting plate and the top cover.

Optionally, the inner ring of the insulating spacer extends towards the direction of the top cover to form a first annular clamping plate, and the first annular clamping plate is located between the periphery of the pole body and the inner wall of the pole hole.

Optionally, a supporting spacer is arranged between the insulating spacer and the first limiting plate.

Optionally, the cover plate further includes a seal disposed between the second limiting plate and the top cover.

Optionally, the inner ring of the sealing member extends towards the top cover to form a second annular clamping plate, and the second annular clamping plate is located between the periphery of the pole body and the inner wall of the pole hole.

Optionally, the apron is still including setting up the lower plastic board of the bottom surface of top cap, lower plastic board sets up the periphery of sealing member, the laminating of second limiting plate is in lower plastic board's one side that deviates from the top cap.

Optionally, a first limit groove is formed in the bottom surface of the top cover, the first limit groove surrounds the periphery of the pole hole, and a limit table matched with the first limit groove is arranged on the lower plastic plate; and/or

The bottom surface of lower plastic plate is equipped with the second spacing groove, the outer lane of second limiting plate sets up in the second spacing groove.

Optionally, the first limiting plate comprises a top plate, an outer ring of the top plate is folded inwards to form a connecting plate, and the end part of the pole body is connected with the connecting plate.

The utility model also provides a battery, which comprises a bottom shell with an open top, a battery cell arranged in the bottom shell and the cover plate, wherein the cover plate is arranged at the open end of the bottom shell, and the battery cell is connected with a pole body on the cover plate.

Compared with the prior art, the technical scheme provided by the embodiment of the utility model has the following advantages:

the pole body is arranged on the top cover through the first limiting plate and the second limiting plate, so that the pole body can be effectively prevented from moving in the axial direction, the fixing effect of the pole body is further ensured, the strength of the pole body is not required by the fixing mode, the inside of the pole body is arranged to be of a hollow structure, the connecting sheet can extend into the inside of the pole body to be connected with the pole body in a welding mode, the space utilization rate of a battery shell is improved, meanwhile, the quality of the pole body is small, and the energy density of the battery can be effectively improved; the pole body can be manufactured in a stamping mode, the process is simple, the efficiency is high, high energy consumption processes such as friction welding and finish machining are not needed, and the manufacturing cost of the pole body can be remarkably reduced.

Drawings

FIG. 1 is a schematic view of a cover plate according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a cover plate according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a schematic view of a first stamping of a substrate according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a second stamping of a substrate according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a third stamping of a substrate according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a substrate after a fourth stamping according to an embodiment of the present utility model;

FIG. 8 is a schematic view of a pole body according to an embodiment of the present utility model;

FIG. 9 is a schematic view of the structure of a portion of the top cover according to the embodiment of the present utility model;

FIG. 10 is a schematic view of a lower plastic plate according to an embodiment of the present utility model;

fig. 11 is a schematic view of a structure of a battery according to an embodiment of the present utility model.

Description of the reference numerals

1. A top cover; 11. a post hole; 12. a first limit groove; 2. a pole body; 21. a pole body; 22. a first limiting plate; 221. a top plate; 222. a connecting plate; 23. a second limiting plate; 24. an opening; 3. an insulating spacer; 31. a first annular clamping plate; 4. a support pad; 5. a seal; 51. the second annular clamping plate; 6. a lower plastic plate; 61. a limiting table; 62. the second limit groove; 7. a first punch, 71, a second punch; 72. a third punch; 73. a fourth punch; 8. a fixed table; 9. and a bottom shell.

Detailed Description

As shown in fig. 1 to 3, the cover plate provided by the embodiment of the utility model comprises a top cover 1 and a pole body 2.

The top cover 1 is provided with a pole hole 11. The pole body 2 comprises a pole body 21 penetrating through the pole hole 11, two ends of the pole body 21 are respectively provided with a first limiting plate 22 and a second limiting plate 23, and an annular clamping groove matched with the top cover 1 in a clamping way is formed between the first limiting plate 22 and the second limiting plate 23; the pole body 21 is hollow, and an opening 24 is formed at one end of the pole body provided with the second limiting plate 23.

Specifically, the two ends of the pole body 21 extend out of the pole hole 11, taking the direction shown in fig. 3 as an example, the top periphery of the pole body 21 is provided with a first limiting plate 22 extending outwards along the radial direction of the pole body 21, the bottom periphery of the pole body 21 is provided with a second limiting plate 23 extending outwards along the radial direction of the pole body 21, the pole body 21 is arranged in the pole hole 11 in a penetrating manner, and a part of top cover 1 of the periphery of the pole hole 11 is clamped between the first limiting plate 22 and the second limiting plate 23 to ensure the connection effect. The bottom end of the pole body 21 is provided with an opening 24 so that the pole lug of the power core extends into the pole body 21 and is welded with the top wall of the pole body 21. The first limiting plate 22, the second limiting plate 23 and the pole body 21 are integrally formed, so that structural strength is ensured. Wherein, the pole body 2 is formed by punching a substrate made of metal copper or aluminum, thereby improving the convenience of processing. The number of the pole holes 11 and the pole bodies 2 should be two, and the mounting manners of the two pole bodies 2 are the same.

Further preferably, as shown in fig. 8, the first limiting plate 22 includes a top plate 221, an outer ring of the top plate 221 is folded inwards to form a connecting plate 222, and an end of the pole body 21 is connected with the connecting plate 222, and the top plate 221 in this design manner can be formed by stamping, so as to increase convenience in manufacturing.

The pole body 2 provided by the utility model is arranged on the top cover 1 through the first limiting plate 22 and the second limiting plate 23, so that the pole body 2 can be effectively prevented from moving in the axial direction, and the fixing effect of the pole body 2 is further ensured. The inside of the pole body 2 is arranged into a hollow structure, and the battery core pole lug and the connecting sheet can extend into the inside of the pole body 2 to be welded with the pole body 2, so that the space utilization rate in the battery shell is improved, and meanwhile, the quality of the pole body is smaller, and the energy density of the battery can be effectively improved; the pole body 2 can be manufactured in a stamping mode, the process is simple and efficient, high energy consumption processes such as friction welding and finish machining are not needed, and the manufacturing cost of the pole body 2 can be remarkably reduced.

As shown in connection with fig. 2 and 3, the cover plate further includes an insulating spacer 3 provided between the first limiting plate 22 and the top cover 1 to ensure an insulating effect between the first limiting plate 22 and the top cover 1.

Further preferably, the inner ring of the insulating spacer 3 extends towards the top cover 1 to form a first annular clamping plate 31, the first annular clamping plate 31 is located between the outer periphery of the pole body 21 and the inner wall of the pole hole 11, and the outer ring of the insulating spacer 3 extends outwards to form the first limiting plate 22. This kind of design can further ensure the insulating effect between first limiting plate 22 and top cap 1, can ensure the insulating effect of the inside wall of utmost point post body 21 and utmost point post hole 11 simultaneously.

Further preferably, a supporting spacer 4 is arranged between the insulating spacer 3 and the first limiting plate 22. The supporting gasket 4 can provide supporting force for stamping the first limiting plate 22, so that the first limiting plate 22 can be formed conveniently. Wherein, the support gasket 4 is made of 304 stainless steel or high carbon steel and other materials with higher strength.

As shown in connection with fig. 2 and 3, the cover plate further includes a sealing member 5 provided between the second limiting plate 23 and the top cover 1 to ensure an insulating effect and a sealing effect between the second limiting plate 23 and the top cover 1.

Further optimally, the inner ring of the sealing piece 5 extends towards the direction of the top cover 1 to form a second annular clamping plate 51, the second annular clamping plate 51 is positioned between the periphery of the pole body 21 and the inner wall of the pole hole 11, and the inner wall of the pole hole 11 and the periphery of the pole body 21 are further separated by the second annular clamping plate 51, so that the insulating effect between the top cover 1 and the pole body 21 is ensured. The second annular clip 51 abuts against the first annular clip 31 between the inner wall of the pole hole 11 and the outer periphery of the pole body 21, and the compactness of the overall structure and the insulation between the pole body 2 and the top cover 1 are ensured.

The apron is still including setting up the lower plastic board 6 in the bottom surface of top cap 1, and lower plastic board 6 sets up in the periphery of sealing member 5, and the laminating of second limiting plate 23 is in the one side of leaving top cap 1 of lower plastic board 6. This kind of design can ensure the insulating effect between second limiting plate 23 and top cap 1, and makes the structure of apron compacter.

Further preferably, as shown in fig. 9 and 10, the bottom surface of the top cover 1 is provided with a first limiting groove 12, the first limiting groove 12 surrounds the periphery of the pole hole 11, and the lower plastic plate 6 is provided with a limiting table 61 matched with the first limiting groove 12. The connection is more compact through the matching mode of the first limit groove 12 and the limit table 61, and meanwhile, the phenomenon of movement between the lower plastic plate 6 and the top cover 1 is avoided.

Further preferably, as shown in fig. 3 and 10, the bottom surface of the lower plastic plate 6 is provided with a second limiting groove 62, and the outer ring of the second limiting plate 23 is arranged in the second limiting groove 62. This kind of design holds the limit portion of second limiting plate 23 through second spacing groove 62, and then plays spacing effect to second limiting plate 23, prevents that second limiting plate 23 from moving for lower plastic plate 6.

The stamping process of the pole body 2 comprises the following steps:

in step S1, a sheet-like substrate (metal copper plate or aluminum plate) is subjected to a first press, i.e., the middle portion of the substrate is pressed upward by a first punch 7, to obtain the structure shown in fig. 4.

Step S2, the substrate obtained after the first stamping passes through the post hole 11, so that the second limiting plate 23 formed after the first stamping is attached to the bottoms of the lower plastic plate 6 and the sealing element 5, the fixing table 8 is supported at the bottom of the second limiting plate 23, a boss capable of extending into the substrate is arranged on the fixing table 8, and the top of the substrate is stamped for the second time through the second punch 71, so as to obtain the substrate structure shown in fig. 5.

In step S3, the substrate is punched for the third time by the third punch 72 with a chamfer to obtain the substrate structure shown in fig. 6.

Step S4, the fourth punching is performed on the substrate by the fourth punch 73, so that the formed first limiting plate 22 is attached to the top of the supporting spacer 4, so as to obtain the structure shown in fig. 7, namely the pole body 2 of the present application, and the first limiting plate 22 and the second limiting plate 23 are clamped on two sides of the top cover 1.

As shown in fig. 1 to 3, it can be known to those skilled in the art that the number of the pole holes 11 formed in the top cover 1 is two, and each pole hole 11 is provided with one pole body 2, and the two pole bodies 2 are respectively a positive pole body 2 and a negative pole body 2, and the setting mode and the mounting mode of the positive pole body 2 and the negative pole body 2 are the same as those of the pole body 2 of the present application. Namely, the top cover 1 is provided with two pole holes 11, and the two pole holes 11 are respectively provided with a positive pole body 2 and a negative pole body 2, wherein the positive pole body 2 and the negative pole body 2 comprise all the technical characteristics of the pole body 2.

As shown in fig. 11, the utility model further provides a battery, which comprises a bottom shell 9 with an open top, a battery cell arranged in the bottom shell 9 and the cover plate, wherein the cover plate is arranged at the open end of the bottom shell 9, the battery cell is connected with the pole body 2 on the cover plate, and particularly the battery cell is connected with the pole body 2 through a connecting sheet, and the cover plate comprises all the technical characteristics of the cover plate.

Claims

1. A cover sheet, comprising:

a top cover (1) provided with a pole hole (11); and

the pole body (2) comprises a pole body (21) penetrating through the pole hole (11), a first limiting plate (22) and a second limiting plate (23) are respectively arranged at two ends of the pole body (21), and an annular clamping groove matched with the top cover (1) in a clamping manner is formed between the first limiting plate (22) and the second limiting plate (23);

the pole body (21) is hollow, and an opening (24) is formed at one end provided with the second limiting plate (23).

2. The cover plate according to claim 1, further comprising an insulating spacer (3) arranged between the first limiting plate (22) and the top cover (1).

3. Cover plate according to claim 2, characterized in that the inner ring of the insulating spacer (3) extends towards the top cover (1) forming a first annular clamping plate (31), the first annular clamping plate (31) being located between the outer periphery of the pole body (21) and the inner wall of the pole bore (11).

4. Cover plate according to claim 2, characterized in that a support gasket (4) is arranged between the insulating gasket (3) and the first limiting plate (22).

5. The cover plate according to claim 1, characterized in that it further comprises a seal (5) arranged between the second limiting plate (23) and the top cap (1).

6. Cover plate according to claim 5, characterized in that the inner ring of the seal (5) extends in the direction of the top cover (1) forming a second annular clamping plate (51), the second annular clamping plate (51) being located between the outer circumference of the pole body (21) and the inner wall of the pole bore (11).

7. The cover plate according to claim 5, further comprising a lower plastic plate (6) arranged on the bottom surface of the top cover (1), wherein the lower plastic plate (6) is arranged on the periphery of the sealing piece (5), and the second limiting plate (23) is attached to one side, away from the top cover (1), of the lower plastic plate (6).

8. The cover plate according to claim 7, wherein a first limit groove (12) is formed in the bottom surface of the top cover (1), the first limit groove (12) surrounds the periphery of the pole hole (11), and a limit table (61) matched with the first limit groove (12) is arranged on the lower plastic plate (6); and/or

The bottom surface of lower plastic board (6) is equipped with second spacing groove (62), the outer lane of second limiting plate (23) sets up in second spacing groove (62).

9. The cover plate according to any one of claims 1 to 8, wherein the first limiting plate (22) comprises a top plate (221), an outer ring of the top plate (221) is folded inwards to form a connecting plate (222), and an end portion of the pole body (21) is connected with the connecting plate (222).

10. A battery comprising a bottom shell (9) with an open top, a battery cell arranged in the bottom shell (9) and a cover plate according to any one of claims 1 to 9, wherein the cover plate is arranged at the open end of the bottom shell (9), and the battery cell is connected with a pole body (2) on the cover plate.