CN214411346U

CN214411346U - Sealing member and battery

Info

Publication number: CN214411346U
Application number: CN202023033337.2U
Authority: CN
Inventors: 彭宁; 谢斌; 徐延铭
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-10-15
Anticipated expiration: 2030-12-16

Abstract

The utility model provides a sealing member and battery, the sealing member is including the first metal level, sealing insulation layer and the second metal level of range upon range of setting in proper order. The utility model provides a sealing member is applied to the battery, can effectively improve the leakproofness of battery.

Description

Sealing member and battery

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to sealing member and battery.

Background

The inside of the chemical battery is a sealed space, so the sealability is important to the battery, and thus, the sealing member is an important constituent member of the battery. At present, adopt the rubber circle as the sealing member of battery more, however, this type of sealing member is great in thickness usually, occupies battery inner space to reduce battery energy density, and, its sealing performance to the battery is also comparatively limited, leads to battery electrolyte to reveal easily, produces great influence to the security of battery, and in addition, the production degree of difficulty of conventional rubber circle class sealing member is great, has also restricted its application to a certain extent.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a sealing member is applied to the battery with it, can effectively improve the leakproofness of battery, avoids the poor scheduling problem of battery security who brings by the leakproofness well.

The utility model provides a preparation method of sealing member can make above-mentioned sealing member, and has advantages such as simple process, easy operation.

The utility model also provides a battery, quality such as good security has.

An aspect of the present invention provides a sealing member, including: the sealing structure comprises a first metal layer, a sealing insulating layer and a second metal layer which are sequentially stacked.

In one embodiment of the present invention, the raw materials of the first metal layer and the second layer may include aluminum, nickel, and steel.

In an embodiment of the present invention, the raw material of the sealing insulating layer may include polypropylene.

In an embodiment of the present invention, the thickness of the sealing member may be 0.1mm to 0.6 mm.

Further, the thickness of the sealing insulating layer may be generally 0.05 to 0.3 mm.

In an embodiment of the present invention, the shape of the sealing member is a circular ring or a polygon.

The utility model discloses a still another aspect provides a battery, including the positive polar cap of casing, closing cap on the casing and be located the electric core of casing, the anodal utmost point ear in the electric core is connected with the positive polar cap electricity, and negative pole utmost point ear and casing electricity are connected, are connected through above-mentioned sealing member seal insulation between positive polar cap and the casing, and the positive polar cap welds with the first metal level of sealing member, and the casing welds with the second metal level of sealing member.

The utility model discloses an in the embodiment, positive polar cap includes the boss and the setting of forming towards electric core direction protrusion and is used for the connecting portion be connected with the sealing member around the boss.

The utility model discloses an among the another embodiment, positive polar cap is including offering the body and the closing member of closing cap on annotating the liquid mouth that are used for annotating the notes liquid mouth into electrolyte in electric core, and the body includes towards the protruding boss that forms of electric core direction and sets up around the boss and be used for the connecting portion be connected with the sealing member, annotates the liquid hole setting at the boss middle part.

Further, the surface of the sealing piece, which is far away from the battery core, does not exceed the surface of the positive electrode cover, which is far away from the battery core.

The utility model discloses at least, have following advantage:

the utility model provides a sealing member has good sealing performance, and is difficult for thermal deformation, and long service life is applied to the battery with it, can effectively improve quality such as security, cyclicity and the life of battery.

The utility model provides a battery adopts above-mentioned sealing member, has quality such as good security, cyclicity and life.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a sealing member according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a die cutting of a sealing member according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a sealing member according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the seal shown in FIG. 3;

fig. 5 is a sectional view of an arrangement mode of the sealing member and the positive electrode cap according to an embodiment of the present invention;

fig. 6 is a sectional view of an arrangement manner of the sealing member and the positive electrode cap according to an embodiment of the present invention;

fig. 7 is a sectional view of an arrangement mode of a sealing member and a positive electrode cap according to an embodiment of the present invention;

fig. 8 is a sectional view of an arrangement mode of a sealing member and a positive electrode cap according to an embodiment of the present invention;

fig. 9 is a sectional view of an arrangement manner of the sealing member and the positive electrode cap according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a positive electrode cap according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a positive electrode cap according to an embodiment of the present invention;

fig. 12 is a cross-sectional view of a battery according to an embodiment of the present invention.

Description of reference numerals:

1. a seal member; 11. a first metal layer; 12. sealing the insulating layer; 13. a second metal layer; 2. a positive electrode cover; 21. a boss; 22. a liquid injection port; 3. a closure member; 4. a housing; 5. a positive electrode tab; 6. and a negative pole tab.

Detailed Description

An aspect of the present invention provides a sealing member, as shown in fig. 1, including: the first metal layer 11, the sealing insulating layer 12, and the second metal layer 13 are stacked in this order. The utility model discloses a set up the metal level on sealing insulation layer two sides for the sealing member has better uniformity, has avoided having the risk of weeping behind the sealing member encapsulation battery, has good sealing performance and life, is favorable to improving quality such as security, cyclicity and the life of battery.

The utility model discloses in, the sealing member especially can be used to between the positive polar cap and the casing of battery, realizes the sealed insulation between positive polar cap and the casing and connects, and positive polar cap and casing generally are the metal material, consequently, the utility model discloses a sealing member two sides set up the metal level, change in with positive polar cap and casing laminating, guarantee good leakproofness between positive polar cap and the casing, and be difficult for receiving influences such as the corruption of electrolyte, qualities such as the life of improvement battery.

Generally, the material of the battery positive electrode cover and the casing is aluminum/nickel/steel, and the raw materials of the first metal layer and the second metal layer may respectively include at least one of aluminum, nickel and steel (these raw materials may also be referred to as metal-philic materials), which is more beneficial for the use of the sealing element, improves the adhesion force between the sealing element and the positive electrode cover and between the sealing element and the casing, and improves the sealing performance.

In a preferred embodiment of the present invention, the raw material of the first metal layer is different from the raw material of the second metal layer, specifically, the raw material of the first metal layer includes aluminum, and the raw material of the second metal layer includes nickel and steel.

The utility model discloses in, sealing insulation layer's raw materials can have better parent metallic property including modified polypropylene, do benefit to and fuse through thermal compound treatment with first metal level and second metal level. Preferably, the metal-philic-modified polypropylene may comprise a metal-philic-modified polypropylene having a melting point of 110-150 ℃.

In a preferred embodiment of the present invention, the sealing insulating layer can be a sealing insulating layer formed by hot-pressing three layers of materials, and is divided into a middle skeleton layer and two surface layers, wherein the two surface layers are the metal-philic modified polypropylene. In the sealing element, the modified polypropylene on the two surface layers is respectively thermally compounded with the first metal layer and the second metal layer, so that the sealing property of the sealing element is improved. In the sealing insulating layer, the melting point of the middle framework layer can be generally 150-240 ℃, which is beneficial to ensuring that the insulating property of the sealing element is not influenced by temperature.

Further, the thickness of the sealing member may be 0.1mm to 0.6mm, wherein the thickness of the sealing insulating layer may be generally 0.05 mm to 0.3mm, the thickness of the first metal layer may be 0.05 mm to 0.3mm, and the thickness of the second metal layer may be 0.05 mm to 0.3 mm. The utility model provides a sealing member when guaranteeing good leakproofness, has thinner thickness, is applied to it in the battery, does benefit to the energy density who improves the battery.

The utility model discloses an in a preferred embodiment, the surface of first metal level still is equipped with the passivation layer, and/or, second metal level surface still is equipped with the passivation layer, does benefit to further qualities such as the sealing performance and the life that improve the sealing member. The thickness of the passivation layer may be generally 1 to 3 μm.

In the present invention, the shape of the sealing element may be the shape of the sealing element that is conventional in the art, for example, it may be a circular ring or a polygon, and may be selected according to actual needs.

In the specific implementation process of the present invention, as shown in fig. 2, the obtained sealing member may be further die-cut into a designated shape according to the use requirement, for example, a circular ring may be die-cut (as shown in fig. 3, a cross-sectional view of the circular ring is shown in fig. 4).

In another aspect, the present invention provides a battery, including the above sealing member.

The battery of the present invention may be a wound battery or a laminated battery, and the shape thereof may be a conventional shape in the field such as a cylindrical shape or a square shape, and is not particularly limited thereto.

Specifically, the battery may generally include a casing, a positive electrode cap covering the casing, and a battery core located in the casing, wherein a positive electrode tab in the battery core is electrically connected to the positive electrode cap, a negative electrode tab is electrically connected to the casing, and the positive electrode cap and the casing are hermetically connected through the sealing member. The positive cover may be welded to the first metal layer of the sealing member and the housing may be welded to the second metal layer of the sealing member. The battery cell is formed by stacking a positive plate, a diaphragm and a negative plate and then winding or stacking the positive plate, the diaphragm and the negative plate in a conventional manner in the field, wherein the diaphragm can be sleeved on the positive plate or the negative plate or can be clamped between the positive plate and the negative plate; the positive pole tabs of the positive pole pieces are converged into a positive pole total tab, the positive pole total tab is electrically connected with the positive pole cover, the negative pole tabs of the negative pole pieces are converged into a negative pole total tab, and the negative pole total tab is electrically connected with the shell.

Specifically, anodal utmost point ear and negative pole utmost point ear can be in the homonymy or the heteronymy of electric core, the utility model discloses do not restrict very much to this. When the positive electrode lug and the negative electrode lug are on the same side of the battery cell, the negative electrode lug can be connected with the second metal layer of the sealing element and is electrically connected with the shell, and an insulating element is arranged between the negative electrode lug and the positive electrode lug to enable the negative electrode lug and the positive electrode lug to be mutually insulated.

In a preferred embodiment of the present invention, the first metal layer of the sealing member is connected to the positive electrode cap, the material of the sealing member is the same as or similar to the material of the positive electrode cap, the second metal layer is connected to the housing, the material of the sealing member is the same as or similar to the material of the housing, for example, when the material of the positive electrode cap is aluminum and the material of the housing is nickel, the material of the first metal layer is aluminum and the material of the second metal layer is nickel, so that the two surfaces of the sealing member have better adhesion force with the positive electrode cap and the housing respectively, thereby improving the sealing performance of the battery.

The shape, size and other parameters of the positive electrode cover can be conventional in the art, for example, in one embodiment, as shown in fig. 6, 7 and 9, the positive electrode cover 2 can include a boss 21 formed to protrude toward the cell and a connection portion disposed around the boss and used for connecting with the sealing member 1, the boss 21 is designed to be more favorable for connecting with a tab; in another embodiment, as shown in fig. 5 and 8, the positive electrode cover 2 may be a sheet shape without the bosses 21.

Specifically, as shown in fig. 5 to 8 and 10, the positive electrode cap 2 may be integrally formed, or, as shown in fig. 9 and 11, may include a body having a pouring port 22 for pouring the electrolyte into the cell and the positive electrode cap 2 having the sealing member 3 provided on the pouring port 22 (as shown in fig. 9 and 11), and the pouring port 21 is preferably provided at the center of the body of the positive electrode cap 2.

In a preferred embodiment of the present invention, the body may include a boss protruding toward the electrical core and a connecting portion disposed around the boss and used for connecting with the sealing element, the liquid injection hole is disposed on the boss and further disposed in the middle of the boss; alternatively, the body may be a sheet without a boss; the surface of the sealing piece far away from the battery cell does not exceed the surface of the positive electrode cover far away from the battery cell generally.

Further, the outer diameter of the positive cap is typically less than (as shown in fig. 7 and 8) or equal to (as shown in fig. 5, 6, and 9) the outer diameter of the seal.

In an embodiment of the present invention, as shown in fig. 12, the battery includes a housing 4, a positive electrode cap 2 covered on the housing 4, and a laminated battery cell located in the housing, wherein a positive electrode tab 5 of the battery cell is electrically connected to a boss 21 on the positive electrode cap 2, a negative electrode tab 6 is electrically connected to the housing 4, and the positive electrode caps 2 and the housing 4 are hermetically connected through the sealing member 1; the positive electrode cover 2 is connected to the first metal layer 11, the case 4 is connected to the second metal layer 13, and the positive electrode and the negative electrode are insulated from each other by the sealing insulating layer 12. The positive electrode cap 2 is provided with a liquid injection port 22, and after the liquid injection is completed, the sealing member 1 is sealed on the liquid injection port to form the battery.

The above is to the sealing member and the battery provided by the present invention described in detail. The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A seal, comprising: the sealing structure comprises a first metal layer, a sealing insulating layer and a second metal layer which are sequentially stacked.

2. The seal of claim 1, wherein the first and second metal layers are each made from one of aluminum, nickel, and steel.

3. The seal of claim 1, wherein the raw material of the seal insulating layer is modified polypropylene.

4. The sealing element according to claim 3, wherein the sealing insulating layer is composed of a middle skeleton layer and metal-philic layers compounded on two surfaces of the middle skeleton layer, and the metal-philic layers are made of modified polypropylene.

5. The seal of claim 1, wherein the seal has a thickness of 0.1mm to 0.6 mm.

6. The seal of claim 1, wherein the thickness of the seal insulating layer is 0.05-0.3 mm.

7. A seal according to any of claims 1 to 6, wherein the seal is in the shape of a ring or polygon.

8. A battery comprising a housing, a positive electrode cap covering the housing, and an electric core disposed in the housing, wherein a positive electrode tab of the electric core is electrically connected to the positive electrode cap, a negative electrode tab of the electric core is electrically connected to the housing, the positive electrode cap and the housing are hermetically and insulatively connected by the sealing member of any one of claims 1 to 5, the positive electrode cap is welded to the first metal layer of the sealing member, and the housing is welded to the second metal layer of the sealing member.

9. The battery of claim 8, wherein the positive electrode cover comprises a boss protruding toward the cell, and a connecting portion disposed around the boss and used for connecting with the sealing member.

10. The battery according to claim 8, wherein the positive electrode cap comprises a body provided with a filling opening for filling electrolyte into the cell, and a sealing member for covering the filling opening, the body comprises a boss protruding toward the cell and a connecting portion disposed around the boss and connected to the sealing member, and the filling opening is disposed in the middle of the boss.

11. The battery of claim 10, wherein the height of the sealing member from the surface of the cell does not exceed the height of the positive electrode cap from the surface of the cell.