CN219534683U - Top cover assembly and battery - Google Patents

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top cover assembly and a battery. According to the utility model, the first cover body and the second cover body can be made of aluminum materials with different strengths, so that the top cover assembly does not need to be integrally made of aluminum materials with higher strength, the strength of the top cover assembly is effectively improved, and meanwhile, the cost is saved.

Description

Top cover assembly and battery

Technical Field

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top cover assembly and a battery.

Background

Today, with the rapid growth of population and the rapid development of socioeconomic, green and efficient secondary batteries are being developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large energy storage, electric traffic power sources and the like. The power battery is used as a main power source of the new energy automobile and becomes one of key components of the electric automobile.

The top cover component of the power battery is one of important component parts of the power battery, and comprises a top cover, a positive pole post, a negative pole post, a positive pole pin and a negative pole pin, wherein the positive pole post and the negative pole post are arranged on the top cover, the positive pole pin is connected with the positive pole post, and the negative pole pin is connected with the negative pole post. At present, because various vibrations and shocks of power battery in actual operating mode, consequently the top cap can not receive great external force effect and take place to warp, and current in order to solve above-mentioned problem, the top cap can adopt the aluminium product preparation of intensity higher, and this kind of design is difficult to take place to warp while can make the top cap bear great external force effect, but greatly increased the cost.

Disclosure of Invention

One of the objects of the present utility model is: the utility model provides a top cap subassembly to solve among the prior art with the whole aluminum product that adopts higher intensity, lead to the higher technical problem of cost.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a top cap subassembly, includes the top cap, the top cap includes first lid and second lid, first lid includes first terminal surface and the second terminal surface that sets up relatively along first direction, be provided with the recess on the first terminal surface of first lid, the second lid set firmly in the recess, the hardness of second lid is less than the hardness of first lid, wherein first direction is followed the thickness direction of first lid.

Preferably, a sinking groove is further formed in the first end face of the first cover body, and the groove is formed in the bottom of the sinking groove.

Preferably, the groove penetrates through the second end face of the first cover body along the first direction; the inner wall of the groove is provided with a bearing table; the second cover body is abutted with the bearing table.

Preferably, the integrated circuit further comprises a first pin body which is integrally formed on the first cover body.

Preferably, the first pin body includes a folded portion and a first tab connection portion, and the first tab connection portion is disposed along a first direction; the folding part is arranged along a second direction, wherein the second direction is perpendicular to the first direction; one end of the folding part is fixedly arranged on the inner wall of the groove; the other end of the folding part is connected with the first tab connecting part.

Preferably, when the receiving base abuts against the second cover, the folded portion abuts against the second cover.

Preferably, a receiving groove is formed in the position, corresponding to the folding portion, of the second cover body, and when the receiving table abuts against the second cover body, the folding portion abuts against the bottom of the receiving groove.

Preferably, the folding portion includes a first layer plate portion and a second layer plate portion that are stacked along the first direction, the first layer plate portion includes a first end and a second end that are disposed opposite along a length direction of the first cover, the second layer plate portion includes a third end and a fourth end that are disposed opposite along a width direction of the first cover, the first end of the first layer plate portion is fixedly disposed on an inner wall of the groove, the second end of the first layer plate portion is fixedly connected with the third end of the second layer plate portion through a bending portion, and the fourth end of the second layer plate portion is connected with the first tab connection portion.

Preferably, the integrated circuit further comprises a second pin body, a second pole matched with the first pin body and a pole assembly matched with the second pin body, wherein the second pole is integrally formed on the second cover body; the second cover body is also provided with a mounting hole; the pole assembly is installed in the installation hole in an insulating and sealing mode, and the second pin body is connected with the pole assembly.

Another object of the utility model is: the utility model provides a battery, including casing, electric core and the top cap subassembly that the description was previously mentioned, the top cap subassembly seal in the uncovered department of casing, just the top cap subassembly with be formed with the accommodation space between the casing, the electric core set up in the accommodation space.

The top cover assembly has the beneficial effects that the top cover is of a split type structure and consists of the first cover body and the second cover body, the first cover body is provided with the groove, the second cover body is arranged on the first cover body through the groove, the hardness of the second cover body is smaller than that of the first cover body, and the first cover body and the second cover body adopt aluminum materials with different hardness, so that the top cover does not need to integrally adopt aluminum materials with higher strength, the strength of the top cover assembly is ensured, and the cost is saved.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic view of the structure of the cap assembly of the present utility model.

Fig. 2 is a schematic cross-sectional structure of the cap assembly of the present utility model.

Fig. 3 is an enlarged schematic view of the structure at a in fig. 2.

Fig. 4 is an enlarged schematic view of the structure at B in fig. 2.

Fig. 5 is an exploded view of the cap assembly of the present utility model.

Fig. 6 is a schematic structural view of the first cover body of the present utility model.

Fig. 7 is an enlarged schematic view of the structure at C in fig. 6.

Fig. 8 is a schematic structural view of the second cover of the present utility model.

Wherein reference numerals are as follows:

100. a top cover assembly;

10. a second cover; 11. a liquid injection hole; 12. an explosion-proof valve; 13. a receiving groove; 14. a second post; 15. a mounting hole; 16. a mounting groove;

20. a first cover; 21. a receiving table; 22. sinking grooves; 23. chamfering; 24. a groove;

30. a first pin body; 31. a folding part; 32. a first tab connection portion;

40. a second pin body; 41. a pole connection portion; 42. a second lug connection;

50. a pole assembly; 51. a first pole; 52. a fastener; 53. a convex portion;

60. a first plastic part;

70. the second plastic piece;

80. a deflection part;

90. and (3) sealing rings.

Detailed Description

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 8, but the present utility model is not limited thereto.

The battery of the embodiment of the utility model comprises a shell, a battery cell and a top cover assembly 100, wherein the top cover assembly 100 is sealed at an opening of the shell, a containing space is formed between the top cover assembly 100 and the shell, and the battery cell is arranged in the containing space.

The battery cell provided by the embodiment of the utility model comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode current collector comprises a positive electrode coating area and a positive electrode lug connected to the positive electrode coating area, and the positive electrode coating area is coated with the positive electrode active material layer. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode current collector comprises a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with the negative electrode active material layer. Taking the lithium ion battery 100 as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the diaphragm can be PPpolypropylene, polypropylene or PEpolyethylene, polyethylene and the like.

Referring to fig. 1 to 8, a top cover assembly 100 according to an embodiment of the present utility model includes a top cover, the top cover includes a first cover 20 and a second cover 10, the first cover 20 includes a first end surface and a second end surface that are disposed opposite to each other along a first direction, a groove 24 is disposed on the first end surface of the first cover 20, the second cover 10 is fixedly disposed in the groove 24, and the hardness of the second cover 10 is less than that of the first cover 20, wherein the first direction is a thickness direction along the first cover 20.

Because the first cover 20 is directly stressed, in order to enable the first cover 20 to bear the action of larger external force without deformation, the hardness of the first cover 20 is large, and because the first cover 20 has a certain protection effect on the second cover 10, in order to save cost, the hardness of the second cover 10 can be low, and the top cover in the embodiment of the utility model adopts a split structure as known from the design thought, and consists of the first cover 20 and the second cover 10, the hardness of the second cover 10 is smaller than that of the first cover 20, and the first cover and the second cover adopt aluminum materials with different strengths, so that the top cover does not need to integrally adopt the aluminum materials with higher hardness, and the strength of the top cover assembly is ensured while the cost is saved.

The first cover 20 and the second cover 10 are both made of aluminum, the first cover 20 is Al3003H18, and the second cover 10 is Al3003H14.

In addition, after the first cover 20 is disposed in the groove 24 on the second cover 10, the first cover 20 and the second cover 10 are connected together by welding.

Referring to fig. 1 to 3 and fig. 6 to 7, in some embodiments, a groove 24 penetrates through a second end surface of the first cover 20 along a first direction, and a receiving stand 21 is disposed on an inner wall of the groove 24, and the receiving stand 21 abuts against the second cover 1020. The groove 24 penetrates through the design of the first cover body 20, so that the use of materials with higher hardness can be reduced to the greatest extent, and the cost is reduced; the bearing table 21 on the inner wall of the groove 24 is designed, so that the installation of the second cover body 10 can be limited, the assembly is quicker, and the consistency requirement in batch production is met.

Specifically, the receiving base 21 is integrally formed on the inner wall of the groove 24, that is, the groove 24 is stepped, and it should be noted that the projection shape of the groove 24 on the first end face of the first cover 20 is designed according to the shape of the second cover 10, and may be rectangular or elliptical.

Referring to fig. 2 to 3 and 6 to 7, in some embodiments, the first end surface of the first cover 20 is further provided with a sink 22, and the groove 24 is disposed at the bottom of the sink 22, where the sink 22 is designed to further reduce the use of higher hardness materials, and in particular, in this embodiment, to reduce the material consumption of the second cover 10 while ensuring the hardness of the top cover, the thickness of the second cover 10 is equal to the distance between the bottom of the sink 22 and the table top of the receiving table 21.

In order to effectively prevent the sharp edge from scratching a worker or damaging a work, the outer edge of the first cover 20 is provided with a chamfer 23.

Referring to fig. 1 to 3, in some embodiments, the first lead body 30 is integrally formed, and the first lead body 30 is integrally formed on the first cover 20. The first pin body 30 and the first cover body 20 are integrally formed components, so that the connecting procedure of the first pin body 30 and the second cover body 10 is omitted, accessories such as plastic parts and sealing rings arranged between the first pin body 30 and the second cover body 10 are omitted, the production cost of the top cover is greatly reduced, in addition, the integral mechanical strength of the first pin body 30 and the top cover is improved, and the service life of the top cover is prolonged.

Specifically, referring to fig. 5 to 8, the first lead body 30 includes a folded portion 31 and a first tab connection portion 32, and the first tab connection portion 32 is disposed along a first direction; the folded portion 31 is disposed along a second direction, wherein the second direction is perpendicular to the first direction; one end of the folded part 31 is fixedly arranged on the inner wall of the groove 24; the other end of the folded part 31 is connected with the first tab connection part 32; the first pin body 30 is formed by stamping, bending and machining, and machining is rapid.

More specifically, the folded portion 31 includes a first laminate portion and a second laminate portion that are stacked in the first direction, the first laminate portion includes a first end and a second end that are disposed opposite to each other in the longitudinal direction of the first cover 20, the second laminate portion includes a third end and a fourth end that are disposed opposite to each other in the width direction of the first cover 20, the first end of the first laminate portion is fixedly disposed on the inner wall of the groove 24, the second end of the first laminate portion is fixedly connected to the third end of the second laminate portion through a bent portion, and the fourth end of the second laminate portion is connected to the first tab connection portion 32.

In some embodiments, in order to increase the contact area between the first pin body 30 and the second cover 10, the drainage to the first pin body 30 is facilitated, and when the receiving platform 21 abuts against the second cover 10, the folded portion 31 abuts against the second cover 10.

In some embodiments, in order to increase the contact area between the first pin body 30 and the second cover body 10, and at the same time, in order to minimize the use of a higher hardness material, in other words, to minimize the distance between the table surface of the receiving table 21 and the second end surface of the first cover body 20, the second cover body 10 is provided with a receiving groove 13 at a position corresponding to the folded portion 31, and when the receiving table 21 abuts against the second cover body 10, the folded portion 31 abuts against the bottom of the receiving groove 13, that is, the first plate portion of the folded portion 31 abuts against the bottom of the receiving groove 13. Regarding the design of the accommodating groove 13, the positioning and fool-proofing function of the second cover body 10 is also achieved, so that the second post 14 is electrically connected with the first pin body 30 when the second cover body 10 is assembled with the first cover body 20.

Referring to fig. 2 and 4-5, in some embodiments, the header assembly 100 further includes a second pin body 40 integrally formed, a second post 14 disposed in cooperation with the first pin body 30, and a post assembly 50 disposed in cooperation with the second pin body 40, wherein the second post 14 is integrally formed on the second cover body 10; the second cover body 10 is also provided with a mounting hole 15; the pole assembly 50 is mounted in the mounting hole 15 in an insulating and sealing manner, and the second pin body 40 is connected with the pole assembly 50. Since the first pin body 30 is integrally formed on the first cover body 20, in order to ensure that the second pole 14 can be electrically connected with the first pin body 30, the second pole 14 can be integrally formed on the second cover body 10, the processing is fast, and the mechanical strength of the second cover body 10 can be increased, and of course, the second pole 14 and the second cover body 10 can also be in a split structure, and then the second pole 14 and the second cover body 10 need to be connected in a welding or clamping way; the pole assembly 50 is mounted in the mounting hole 15 in an insulating and sealing manner, and the second pin body 40 is connected with the pole assembly 50, so that the second pin body 40 and the second cover body 10 can be prevented from being electrically connected, that is, short circuit can be prevented.

Referring to fig. 5, in some embodiments, the second pin body 40 includes a pole connection portion 41 and a second tab connection portion 42, the second tab connection portion 42 is disposed along the first direction, the pole connection portion 41 is disposed along the second direction, and the pole connection portion 41 is respectively connected to the pole assembly 50 and the second tab connection portion 42, where the pole connection portion 41 has a plate-shaped structure.

It should be noted that, the second pin body 40 and the first pin body 30 are all integrally formed, which is convenient for processing.

Referring to fig. 5, in some embodiments, a deflection portion 80 is provided at a middle portion of the first tab connection portion 32 and a middle portion of the second tab connection portion 42. Through the setting of the deflection part 80, the deflection part 80 can be bent with an angle or a curve, and specifically, the deflection part 80 is used for buckling the pin and the battery cell, and has the function of structural positioning.

Referring to fig. 2 and 4, in some embodiments, the pole assembly 50 includes a fastener 52 and a first pole 51, a first plastic member 60, a sealing ring 90 and a second plastic member 70 sequentially sleeved on the fastener 52 from the first end face to the second end face, in order to insulate and seal between the first pole 51 and the second cover 10, the first plastic member 60 is disposed between the first pole 51 and the second cover 10, and in order to facilitate the installation and positioning of the first plastic member 60, an installation groove 16 in plug-fit with the first plastic member 60 is disposed on an end face, close to the first end face, of the second cover 10, and the installation hole 15 is disposed at a bottom of the installation groove 16; in order to seal between the fastener 52 and the mounting hole 15, a seal ring 90 is provided between the fastener 52 and the mounting hole 15; in order to insulate and seal the second pin body 40 from the second cover body 10, the second plastic member 70 is disposed between the second pin body 40 and the second cover body 10, and in order to facilitate the installation and positioning of the second plastic member 70, a positioning slot is disposed on an end surface of the second cover body 10, which is close to the second end surface, and is in plug-in fit with the second plastic member 70, and the installation hole 15 penetrates through a slot bottom of the positioning slot.

Referring to fig. 4 to 5, further, the first plastic member 60 is provided with a first bump, and the bottom of the mounting groove 16 is provided with a first groove in insertion fit with the first bump, so as to effectively enhance the connection firmness between the first plastic member 60 and the second cover 10. The second plastic part 70 is provided with a second bump, and one end face of the second cover body 10, which is close to the second end face, is provided with a second groove which is in plug-in fit with the second bump, so that the connection firmness between the second plastic part 70 and the second cover body 10 is effectively enhanced.

Referring to fig. 8, in some embodiments, the second cover 10 is further provided with a liquid injection hole 11 and an explosion-proof hole, the electrolyte can enter the battery through the liquid injection hole 11, and the liquid injection hole 11 is provided with a sealing member for sealing the liquid injection hole 11 to prevent the electrolyte from leaking out of the liquid injection hole 11; the explosion-proof valve 12 is arranged at the explosion-proof hole, when the internal pressure of the battery reaches a threshold value, the explosion-proof valve 12 is broken, and the internal air pressure of the battery is released, so that the safety of the battery is improved.

The battery according to the embodiment of the utility model comprises the top cover assembly 100 of the embodiment, wherein the top cover assembly 100 comprises the first cover body 20 and the second cover body 10, and the second cover body 10 has the hardness smaller than that of the first cover body 20, so that the first cover body 20 and the second cover body 10 can adopt aluminum materials with different strengths, and further the top cover assembly 100 does not need to integrally adopt the aluminum materials with higher strength, thereby effectively improving the strength of the top cover assembly 100 and simultaneously saving the cost.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. A top cap subassembly, characterized in that: including the top cap, the top cap includes first lid (20) and second lid (10), first lid (20) are including along the relative first terminal surface and the second terminal surface that sets up of first direction, be provided with recess (24) on the first terminal surface of first lid (20), second lid (10) set firmly in recess (24), the hardness of second lid (10) is less than the hardness of first lid (20), wherein first direction is followed the thickness direction of first lid (20).

2. The header assembly of claim 1, wherein: the first end face of the first cover body (20) is also provided with a sinking groove (22), and the groove (24) is arranged at the bottom of the sinking groove (22).

3. The header assembly of claim 1, wherein: the groove (24) penetrates through the second end face of the first cover body (20) along a first direction; the inner wall of the groove (24) is provided with a bearing table (21); the second cover body (10) is abutted against the receiving table (21).

4. A cap assembly according to claim 3, wherein: the integrated circuit further comprises a first pin body (30) which is integrally formed, and the first pin body (30) is integrally formed on the first cover body (20).

5. The header assembly of claim 4, wherein: the first pin body (30) comprises a folding part (31) and a first tab connecting part (32), and the first tab connecting part (32) is arranged along a first direction; the folded portion (31) is arranged along a second direction, wherein the second direction is perpendicular to the first direction; one end of the folding part (31) is fixedly arranged on the inner wall of the groove (24); the other end of the folding part (31) is connected with the first tab connecting part (32).

6. The header assembly of claim 5, wherein: when the receiving base (21) is in contact with the second cover (10), the folded portion (31) is in contact with the second cover (10).

7. The header assembly of claim 5, wherein: the second cover body (10) is provided with a containing groove (13) at a position corresponding to the folding part (31), and when the bearing table (21) is abutted with the second cover body (10), the folding part (31) is abutted with the groove bottom of the containing groove (13).

8. A roof assembly as defined in claim 6 or 7, wherein: the folding portion (31) comprises a first layer plate portion and a second layer plate portion which are stacked along the first direction, the first layer plate portion comprises a first end and a second end which are oppositely arranged along the length direction of the first cover body (20), the second layer plate portion comprises a third end and a fourth end which are oppositely arranged along the width direction of the first cover body (20), the first end of the first layer plate portion is fixedly arranged on the inner wall of the groove (24), the second end of the first layer plate portion is fixedly connected with the third end of the second layer plate portion through a bending portion, and the fourth end of the second layer plate portion is connected with the first electrode lug connecting portion (32).

9. The header assembly of claim 4, wherein: the integrated circuit further comprises a second pin body (40) formed integrally, a second pole (14) matched with the first pin body (30) and a pole assembly (50) matched with the second pin body (40), wherein the second pole (14) is formed integrally on the second cover body (10); the second cover body (10) is also provided with a mounting hole (15); the pole assembly (50) is installed in the installation hole (15) in an insulating and sealing mode, and the second pin body (40) is connected with the pole assembly (50).

10. A battery, characterized in that: the battery pack comprises a shell, a battery cell and the top cover assembly according to any one of claims 1 to 9, wherein the top cover assembly (100) is sealed at an opening of the shell, a containing space is formed between the top cover assembly (100) and the shell, and the battery cell is arranged in the containing space.