阅读说明：本技术 一种电芯极耳结构及电池 (Battery core tab structure and battery ) 是由 王历川 其他发明人请求不公开姓名 于 2020-12-29 设计创作，主要内容包括：本发明涉及电池领域,公开一种电芯极耳结构及电池。所述电芯极耳结构包括金属件和极耳胶,金属件上包覆有铝塑膜,极耳胶包括相连的主体部和限位部,主体部夹设于金属件与铝塑膜之间,限位部凸设于主体部上,限位部用于对一个电芯极耳结构的铝塑膜与相邻的另一个电芯极耳结构的金属件的间距进行限位。所述电池包括上述的电芯极耳结构。本发明提供的电芯极耳结构及电池,能够避免电芯极耳结构的金属件与相邻电芯极耳结构的铝塑膜端面搭接而导致短路,无需额外增加例如贴胶等新工序,生产成本低,生产效率高,提高电池的安全可靠性。(The invention relates to the field of batteries and discloses a battery core tab structure and a battery. The battery core tab structure comprises a metal piece and a tab adhesive, the metal piece is coated with an aluminum plastic film, the tab adhesive comprises a main body part and a limiting part which are connected, the main body part is clamped between the metal piece and the aluminum plastic film, the limiting part is convexly arranged on the main body part, and the limiting part is used for limiting the distance between the aluminum plastic film of one battery core tab structure and the metal piece of another adjacent battery core tab structure. The battery comprises the battery core tab structure. The battery cell tab structure and the battery provided by the invention can avoid short circuit caused by the lap joint of the metal piece of the battery cell tab structure and the end face of the aluminum plastic film of the adjacent battery cell tab structure, do not need to additionally add new procedures such as adhesive tape and the like, have low production cost and high production efficiency, and improve the safety and reliability of the battery.)

1. The utility model provides an electricity core utmost point ear structure, includes metalwork (1), the cladding has plastic-aluminum membrane (100) on metalwork (1), its characterized in that, electricity core utmost point ear structure still includes utmost point ear glue (2), utmost point ear glue (2) are including continuous main part (21) and spacing portion (22), main part (21) press from both sides and locate metalwork (1) with between plastic-aluminum membrane (100), spacing portion (22) are protruding to be located on main part (21), spacing portion (22) are used for one electricity core utmost point ear structure plastic-aluminum membrane (100) and adjacent another electricity core utmost point ear structure the interval of metalwork (1) is spacing.

2. The battery core tab structure of claim 1, wherein the maximum height of the limiting part (22) is greater than the maximum height of the aluminum plastic film (100) by taking the surface of the metal piece (1) as a reference surface.

3. The battery cell tab structure of claim 1, wherein the main body portion (21) is provided with a first through groove, the limiting portion (22) is provided with a second through groove communicated with the first through groove, and the metal piece (1) penetrates through the first through groove and the second through groove.

4. The battery core tab structure of claim 1, wherein the maximum height of the limiting part (22) protruding out of the main body part (21) is in a range of 0.1mm-1 mm.

5. The battery cell tab structure of claim 1, wherein the limiting portion (22) is arc-shaped in cross section.

6. The battery cell tab structure of claim 1, wherein the limiting portion (22) is trapezoidal in cross section.

7. The battery cell tab structure of claim 1, wherein the limiting portion (22) is rectangular in cross section.

8. The battery tab structure of claim 1, wherein the limiting portion (22) is bonded to the main body portion (21).

9. The battery cell tab structure of claim 1, wherein the main body portion (21) and the limiting portion (22) are integrally formed.

10. A battery comprising a cell tab structure according to any of claims 1 to 9.

Technical Field

The invention relates to the field of batteries, in particular to a battery core tab structure and a battery.

Background

The lithium ion battery has the advantages of high energy density, long cycle life, safety, environmental protection and the like, and gradually becomes the mainstream direction of the electrokinetic era. Structurally, the lithium ion battery is divided into a cylindrical battery cell, a soft-package battery cell and a hard-shell battery cell, wherein the soft-package battery cell is concerned about due to the advantages of simple structure, low cost, simple and convenient manufacturing process and the like. Because the capacity and the size of the single battery cell are limited to a certain extent, the electric quantity of the system is improved by generally adopting a mode of firstly connecting the single battery cells in parallel and then connecting the single battery cells in series in the grouping process of the system. In the process of parallel connection of the soft-package battery cells, 2-3 battery cells are generally combined into a unit, and the tabs of the battery cells are folded and then assembled with a current collector in a welding mode. However, in the tab folding process, because the tab spacing between different cells is small and the tab is close to the end face of the aluminum-plastic film, the tab of the positive electrode and the negative electrode of a certain cell is easily overlapped with the end face of the aluminum-plastic film of the adjacent cell tab, resulting in short cell (the aluminum layer structure exposed on the end face of the aluminum-plastic film belongs to a good electronic conductor), which may result in a cell or module rejection if the cell or module is light, or may result in a major safety accident if the cell or module is heavy.

How to effectively avoid the external short of soft-packaged electrical core in group in-process, become the problem that soft-packaged electrical core in group in-process urgently needed to solve. At present, the measures adopted include: adhering an insulating glue to the end faces of the aluminum plastic films positioned on the positive and negative sides for insulating treatment; carry out certain degree of buckling to the utmost point ear that is located plastic-aluminum membrane terminal surface department, and then increase the distance of plastic-aluminum membrane terminal surface and adjacent soft-packaged electrical core utmost point ear. The scheme of sticking the insulating glue has the following problems: in the long term, the insulating glue has the risk of falling off; the procedure of sticking insulating glue needs to be added, so that the production efficiency is influenced; need to develop the rubberizing frock of special aim at plastic-aluminum membrane terminal surface, increase manufacturing cost. The scheme of bending the tab at the end face of the aluminum-plastic film to a certain degree has the following problems: a tab bending process is required to be added, the bending difficulty is high, and the production efficiency is influenced; adaptation equipment needs to be developed, increasing manufacturing costs.

Disclosure of Invention

Based on the above problems, an object of the present invention is to provide a tab structure of a battery cell, which can avoid short circuit caused by overlapping of positive and negative tabs of the battery cell with end faces of aluminum-plastic films of adjacent tab structures of the battery cell, without additional new processes such as adhesive tape, and has the advantages of low production cost, high production efficiency, and improved safety and reliability of the battery.

The invention also aims to provide a battery, which can avoid short circuit caused by lap joint of positive and negative electrode lugs of a battery core and the end faces of aluminum plastic films of adjacent electrode lug structures of the battery core, does not need to additionally add new processes such as rubberizing and the like, has low production cost and high production efficiency, and improves the safety and reliability of the battery.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an electricity core utmost point ear structure, includes the metalwork, the cladding has the plastic-aluminum membrane on the metalwork, electricity core utmost point ear structure still includes utmost point ear glue, utmost point ear glue including continuous main part and spacing portion, the main part presss from both sides and locates the metalwork with between the plastic-aluminum membrane, spacing portion is protruding to be located on the main part, spacing portion is used for one electricity core utmost point ear structure the plastic-aluminum membrane is with adjacent another electricity core utmost point ear structure the interval of metalwork carries on spacingly.

As a preferred scheme of the battery cell tab structure of the present invention, the surface of the metal piece is used as a reference surface, and the maximum height of the limiting portion is greater than the maximum height of the aluminum plastic film.

As a preferable scheme of the battery cell tab structure of the present invention, the main body portion is provided with a first through groove, the limiting portion is provided with a second through groove communicated with the first through groove, and the metal member penetrates through the first through groove and the second through groove.

As a preferable scheme of the battery cell tab structure of the invention, the maximum height range of the limiting part protruding the main body part is 0.1mm-1 mm.

As a preferable scheme of the battery cell tab structure of the invention, the cross section of the limiting part is arc-shaped.

As a preferable scheme of the battery cell tab structure of the present invention, the cross section of the limiting portion is trapezoidal.

As a preferable scheme of the battery cell tab structure of the present invention, the cross section of the limiting portion is rectangular.

As a preferable aspect of the battery cell tab structure of the present invention, the limiting portion is bonded to the main body portion.

As a preferable aspect of the battery cell tab structure of the present invention, the main body portion and the limiting portion are integrally formed.

A battery includes the cell tab structure described above.

The invention has the beneficial effects that:

according to the cell tab structure provided by the invention, the metal piece is coated with the aluminum-plastic film, the main body part of the tab glue is clamped between the metal piece and the aluminum-plastic film, and the limiting part is arranged on the main body part in a protruding mode, so that the spacing between the aluminum-plastic film of one cell tab structure and the metal piece of another adjacent cell tab structure is limited by the limiting part, short circuit caused by lap joint of the metal piece of the cell tab structure and the end face of the aluminum-plastic film of the adjacent cell tab structure can be avoided, new processes such as gluing and the like are not required to be additionally added, the production cost is low, the production efficiency is high, and the safety and reliability of.

The battery provided by the invention comprises the battery cell tab structure, can avoid short circuit caused by the lap joint of the metal piece of the battery cell tab structure and the end face of the aluminum plastic film of the adjacent battery cell tab structure, does not need to additionally add new procedures such as adhesive tape and the like, has low production cost and high production efficiency, and improves the safety and reliability of the battery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery cell tab structure provided in an embodiment of the present invention during packaging;

fig. 2 is a schematic structural diagram of a cell tab structure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another cell tab structure provided in the embodiment of the present invention during packaging;

fig. 4 is a schematic structural diagram of a plurality of battery cell tab structures according to another embodiment of the present invention during packaging;

fig. 5 is a schematic structural diagram of a battery cell tab structure according to another embodiment of the present invention during packaging;

fig. 6 is a schematic structural diagram of a plurality of yet another battery cell tab structures provided in the embodiment of the present invention during packaging.

In the figure:

1-a metal part; 2, pole lug glue; 21-a main body portion; 22-a limiting part;

100-aluminum plastic film.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. 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. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 6, the embodiment provides a cell tab structure, the cell tab structure includes a metal member 1 and a tab glue 2, the metal member 1 is coated with an aluminum plastic film 100, the tab glue 2 includes a main body portion 21 and a limiting portion 22 connected to each other, the main body portion 21 is clamped between the metal member 1 and the aluminum plastic film 100, the limiting portion 22 is convexly disposed on the main body portion 21, and the limiting portion 22 is used for limiting a distance between the aluminum plastic film 100 of one cell tab structure and the metal member 1 of another adjacent cell tab structure.

Cladding plastic-aluminum membrane 100 on metalwork 1, make the main part 21 of utmost point ear gum 2 press from both sides and locate between metalwork 1 and plastic-aluminum membrane 100, spacing portion 22 is protruding established on main part 21, make spacing portion 22 carry on spacingly to the plastic-aluminum membrane 100 of an electric core utmost point ear structure and the interval of the metalwork 1 of another adjacent electric core utmost point ear structure, can avoid the metalwork 1 of electric core utmost point ear structure and the plastic-aluminum membrane 100 terminal surface overlap joint of adjacent electric core utmost point ear structure and lead to the short circuit, need not additionally to increase new processes such as rubberizing, low in production cost, high production efficiency, improve the fail safe nature of battery.

In order to prevent the metal part 1 of the cell tab structure from being overlapped with the end surface of the aluminum plastic film 100 of the adjacent cell tab structure to cause short circuit, optionally, the surface of the metal part 1 is used as a reference surface, and the maximum height of the limiting part 22 is greater than the maximum height of the aluminum plastic film 100. Under the limiting action of the limiting part 22, the metal piece 1 of the cell tab structure cannot contact with the end surface of the aluminum plastic film 100 of the adjacent cell tab structure.

To facilitate assembly of the metal part 1 and the tab glue 2, optionally, the main body portion 21 is provided with a first through groove, the limiting portion 22 is provided with a second through groove communicated with the first through groove, and the metal part 1 penetrates through the first through groove and the second through groove. The shape of the first through groove and the second through groove depends on the sectional shape of the metal member 1, for example, if the sectional shape of the metal member 1 is rectangular, the shape of the first through groove and the second through groove is also adaptively rectangular.

In the present embodiment, since the space between the adjacent cell tab structures is limited, the maximum height of the limiting part 22 protruding the main body part 21 ranges from 0.1mm to 1 mm. It should be noted that the limiting portion 22 does not affect the package of the pouch cell and the assembly of the battery module.

Alternatively, the cross-section of the stopper portion 22 is arc-shaped. The arc design is adopted, so that the appearance is smooth and attractive. In this embodiment, as shown in fig. 1 and 2, the arc-shaped root extends to a straight line, which facilitates the processing.

Alternatively, as shown in fig. 3 and 4, the stopper portion 22 may have a trapezoidal cross section. The trapezoidal longer lower bottom is towards the setting of plastic-aluminum membrane 100, can avoid the metalwork 1 of electric core utmost point ear structure and the 100 terminal surface overlap joints of plastic-aluminum membrane of adjacent electric core utmost point ear structure and lead to the short circuit in the time, reduces spacing portion 22's occupation space.

As shown in fig. 5 and 6, the stopper portion 22 may alternatively have a rectangular cross section. In order to avoid scratching the operator, the right angle of the rectangle can be set to be a chamfer or a fillet. Of course, in other embodiments, the cross section of the limiting portion 22 may also be in other shapes, as long as it can be ensured that the metal piece 1 of the cell tab structure cannot contact with the end surface of the aluminum plastic film 100 of the adjacent cell tab structure under the limiting action of the limiting portion 22.

Alternatively, the stopper 22 is bonded to the main body 21. For example, the stopper portion 22 is bonded to the main body portion 21 by a hot-melt method, so that the conventional tab adhesive 2 is easily modified, and the cost is reduced.

Alternatively, the main body portion 21 and the stopper portion 22 are integrally molded. For example, the main body 21 and the limiting part 22 can be integrally formed by injection molding, so that the processing is convenient, and the production efficiency is improved.

The metal member 1 may be an aluminum positive electrode, a copper negative electrode, or a nickel copper negative electrode. The afterbody of metalwork 1 is provided with the fillet, and convenient follow-up encapsulation is inside soft-packaged electrical core.

The electric core tab structure that this embodiment provided, cladding plastic-aluminum membrane 100 on metalwork 1, make the main part 21 of utmost point ear gum 2 press from both sides and locate between metalwork 1 and plastic-aluminum membrane 100, spacing portion 22 is protruding established on main part 21, make spacing portion 22 carry on spacingly to the plastic-aluminum membrane 100 of an electric core tab structure and the interval of the metalwork 1 of another adjacent electric core tab structure, can avoid the metalwork 1 of electric core tab structure and the plastic-aluminum membrane 100 terminal surface overlap joint of adjacent electric core tab structure and lead to the short circuit, need not additionally to increase new processes such as rubberizing, low in production cost, high production efficiency, the fail safe nature of battery is improved.

This embodiment still provides a battery, including foretell electric core utmost point ear structure, can avoid the metalwork 1 of electric core utmost point ear structure and 100 terminal surface overlap joints of plastic-aluminum membrane of adjacent electric core utmost point ear structure and lead to the short circuit, need not additionally to increase new processes such as rubberizing, low in production cost, production efficiency is high, improves the fail safe nature of battery.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.