CN206432317U - Battery core and battery - Google Patents

Abstract

The present application relates to the technical field of power supply structure, and in particular to a battery cell and a battery. The battery cell includes a cell body and tabs. The insulating layer on the tab body, the insulating layer is used for insulation and isolation between the tab body and the battery core body. The electric core provided by the present application is provided with an insulating layer on the tab body. When the tab is bent, the insulating layer can be insulated and isolated between the tab body and the cell main body, thereby preventing the tab from being separated from the core body. The main body of the battery cell is in direct contact, making it difficult to form an internal short circuit inside the battery. Therefore, the cell can improve the safety of the battery.

Description

Cells and Batteries

technical field

The present application relates to the technical field of power supply structures, in particular to a battery cell and a battery.

Background technique

With the continuous increase in energy demand, the application range of batteries is also becoming wider and wider. The battery cell is one of the more important parts of the battery. In order to increase the energy density of the battery, the design method of the limit top cover is often used at present. After this setting, the top bracket can be canceled, thereby increasing the internal space utilization of the battery cell. Increase energy density. In this solution, the tab needs to be bent.

However, since the top bracket is cancelled, after the tab is bent, it is easy to contact with the cell body, resulting in an internal short circuit inside the battery. Therefore, there is a great potential threat to the safety of this battery.

Utility model content

The present application provides a battery cell and a battery, and the battery cell can improve the safety of the battery.

The first aspect of the present application provides a cell, which includes a cell body and a tab, the tab is a bent structure, and the tab includes a tab body and a tab disposed on the tab body An insulating layer, the insulating layer is used for insulating and separating between the lug body and the battery core body.

Preferably, the insulating layer is adhered to the lug body.

Preferably, the insulating layer is an insulating coating layer.

Preferably, the insulating layer has a thickness of 2-10 μm.

Preferably, along the length direction of the electric core, the insulating layer extends from one side of the tab body to the other side of the tab body.

Preferably, the cell main body includes a first current collector and an active material coating layer disposed on the first current collector, and the insulating layer is connected to the active material coating layer.

Preferably, the lug body includes a second current collector, the second current collector has a blank area and an insulating layer coating area, the insulating layer is disposed on the insulating layer coating area, and the blank area The width is greater than or equal to the width of the insulating layer coating area, and the width is the dimension in the height direction of the electric core.

Preferably, the insulating layer includes a first insulating section and a second insulating section, the first insulating section is located between the core body and the second insulating section, and the second insulating section is away from the One side of the cell body extends away from the cell body to a bend of the tab, and is located at a side of the bend away from the cell body.

Preferably, the insulating layer is a polyvinylidene fluoride layer.

The second aspect of the present application provides a battery, which includes a casing, a battery cell and a pole, the battery cell is the battery cell described in any one of the above, and the tab is electrically connected to the battery cell body and between the poles.

The technical solution provided by the application can achieve the following beneficial effects:

The electric core provided by this application is provided with an insulating layer on the tab body. When the tab is bent, the insulating layer can be insulated and isolated between the tab body and the cell main body, thereby preventing the tab from being separated from the main body of the cell. The main body of the battery cell is in direct contact, making it difficult to form an internal short circuit inside the battery. Therefore, the cell can improve the safety of the battery.

It is to be understood that both the foregoing general description and the following detailed description are exemplary only and are not restrictive of the application.

Description of drawings

Figure 1 is a schematic diagram of the assembly of the battery cell and the pole provided by the embodiment of the present application;

Fig. 2 is a schematic structural view of the cell before die-cutting provided by the embodiment of the present application;

FIG. 3 is a schematic diagram of the die-cut structure of the cell provided by the embodiment of the present application.

Reference signs:

10-cell main body;

100-active material coating layer;

11-pole ear;

110-ear body;

110a - second current collector;

111 - insulating layer;

12-pole.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

detailed description

The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1-3, the embodiment of the present application provides a cell, which includes a cell body 10 and a tab 11, the tab 11 can form a bent structure through a bending operation, and the cell The top bracket can be eliminated, thereby increasing the energy density of the battery. The tab 11 may be a positive tab or a negative tab, and may include a tab body 110 and an insulating layer 111 disposed on the tab body 110 . The insulating layer 111 is used for insulating between the lug body 110 and the battery core body 10 . Here, the cell main body 10 may include a first current collector and an active material coating layer 100, the active material coating layer 100 is disposed on the first current collector, and the tab body 110 may generally include a second current collector 110a, and The second current collector 110 a and the first current collector can form an integrated structure, for example, by performing a die-cutting operation on a complete current collector to form the aforementioned tab 11 .

Specifically, the insulating layer 111 can be arranged on the lug body 110 by bonding, so an adhesive layer (not shown in the figure) can be arranged between the two, and the bonding method can ensure that the insulating layer 111 The bonding strength with the lug body 110 can also simplify the arrangement of the insulating layer 111 . The insulating layer 111 can be processed by coating, so the insulating layer 111 can preferably be an insulating coating layer.

When the above-mentioned electric core is used, when the tab 11 is bent, the insulating layer 111 of the tab 11 can be insulated and isolated between the tab body 110 and the main body 10 of the electric core, that is to say, the main body 10 of the electric core can be separated from the insulating layer 111 is in direct contact with the tab body 110, so that it is not easy to form an internal short circuit inside the battery. Therefore, the cell can improve the safety of the battery.

The area occupied by the insulating layer 111 on the lug body 110 can be flexibly set according to actual conditions, for example, the insulating layer 111 is only provided on a part of the lug body 110 . In order to more reliably prevent internal short circuits inside the battery, the embodiment of the present application adopts the following arrangement: along the length direction of the cell, the insulating layer 111 extends from one side of the tab body 110 to the other side of the tab body 110 . The length direction of the cell refers to the extension direction of the connection between the tab 11 and the cell body 10. When the tab 11 is bent, a relatively gentle strip is formed on the side of the tab body 110 close to the cell body 10. Shaped part, and the insulating layer 111 can be arranged along the extending direction of the bar-shaped part, so that the covering area of the insulating layer 111 on the lug body 110 is increased, thereby achieving the aforementioned purpose.

In addition, in view of the aforementioned, when the tab 11 is bent, a relatively gentle strip-shaped portion is formed on the side of the tab body 110 close to the main body 10 of the battery core, and the strip-shaped portion usually presents a rectangular structure, so the The insulating layer 111 is arranged as a rectangular insulating layer so as to cover the tab body 110 more completely. At the same time, this arrangement can also simplify the processing technology of the insulating layer 111 and reduce the processing cost of the electric core.

It can be understood that the insulating layer 111 and the active material coating layer 100 of the battery core body 10 may not be in contact with each other, but in order to improve the insulating performance of the insulating layer 111, the insulating layer 111 and the active material coating layer 100 can be connected together , so that there is no gap between the two. More importantly, this arrangement can apply force to the insulating layer 111 through the active material coating layer 100 , so that the insulating layer 111 is not easily separated from the lug body 110 , further enhancing the structural strength of the insulating layer 111 .

The above-mentioned second current collector 110a has a blank area and an insulating layer coating area, and the insulating layer 111 is disposed on the insulating layer coating area, while no structure is provided on the blank area, and the width of the blank area is greater than or equal to that of the insulating layer. The width of the coating area, where the width is the dimension in the height direction of the cell. After the tab 11 is bent, the area of the part that is easy to contact with the battery core body 10 is relatively small, so after adopting the aforementioned arrangement method, it can be ensured that the insulating layer 111 can reliably realize the connection between the battery core body 10 and the tab body. The insulation between 110 can also ensure that the blank area has a large enough area, so as to ensure the connection between the tab 11 and the pole 12 of the battery.

In a preferred embodiment, the insulating layer 111 may specifically include a first insulating segment and a second insulating segment, the first insulating segment is located between the cell main body 10 and the second insulating segment, and a part of the second insulating segment away from the cell main body 10 is The side extends to the bend of the tab 11 along the direction away from the cell main body 10 , and is on the side of the bend away from the cell main body 10 . That is, the width of the insulating layer 111 is relatively large, so that the second insulating segment thereof can almost prevent the direct contact between the lug body 110 and the cell main body 10 in most cases, thereby improving the insulating effect.

The function of the insulating layer 111 is to realize the insulation between the cell body 10 and the lug body 110 , so when selecting the manufacturing material of the insulating layer 111 , the insulating performance of the insulating material is mainly considered. In one embodiment, the insulating layer 111 may be made of PVDF (Poly(vinylidene fluoride), polyvinylidene fluoride), so the insulating layer 111 may be a polyvinylidene fluoride layer. PVDF mainly refers to a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and a small amount of other fluorine-containing vinyl monomers. It has the characteristics of both fluororesins and general-purpose resins. In addition to oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectricity, and pyroelectricity. When preparing the polyvinylidene fluoride layer, a certain quality of PVDF can be dissolved in NMP (N-Methyl pyrrolidone, N-methylpyrrolidone) solution first, and stirred evenly to prepare a solid content of 5%-10%, a viscosity of 2000-4000mpa·s solution. Then use a coating machine and other devices to coat the above solution on a certain area on the second current collector, and at this time, an area that needs to be die-cut can be reserved. After drying in an oven, the coating thickness of the insulating layer 111 can be controlled within a range of 50-100 um.

Certainly, the above-mentioned PVDF solution may also be replaced by a similar solution, such as a PE (polyethylene, polyethylene) solution.

The thickness of the insulating layer 111 may preferably be 2˜10 μm.

Based on the above structure, the embodiment of the present application also provides a battery, which may include a casing, a battery cell and a pole 12, the battery cell is the battery cell described in any of the above embodiments, and the tab 11 of the battery cell is electrically It is connected between the cell main body 10 and the pole 12 .

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. An electric core, characterized in that it includes an electric core main body and a tab, the tab is a bent structure, and the tab includes a tab body and an insulating layer disposed on the tab body, The insulating layer is used for insulating and separating between the lug body and the battery core body. 2 . The electric core according to claim 1 , wherein the insulating layer is adhered to the lug body. 3 . 3. The electric core according to claim 1, wherein the insulating layer is an insulating coating layer. 4 . The battery cell according to claim 1 , wherein the insulating layer has a thickness of 2-10 μm. 5. The electric core according to claim 1, characterized in that, along the length direction of the electric core, the insulating layer extends from one side of the tab body to the other side of the tab body . 6. The electric core according to claim 1, wherein the main body of the electric core comprises a first current collector and an active material coating layer disposed on the first current collector, and the insulating layer and the The active material coating layers are connected. 7. The battery cell according to claim 1, wherein the tab body comprises a second current collector, the second current collector has a blank area and an insulating layer coating area, and the insulating layer is arranged on On the insulating layer coating area, the width of the blank area is greater than or equal to the width of the insulating layer coating area, and the width is a dimension in the height direction of the electric core. 8. The electric core according to any one of claims 1-7, wherein the insulating layer comprises a first insulating section and a second insulating section, and the first insulating section is located between the main body of the electric core and the second insulating section. Between the second insulating sections, the side of the second insulating section away from the main body of the electric core extends to the bend of the tab along the direction away from the main body of the electric core, and is located at the The bend is away from the side of the main body of the battery core. 9. The battery cell according to any one of claims 1-7, wherein the insulating layer is a polyvinylidene fluoride layer. 10. A battery, characterized in that it includes a casing, a battery cell and a pole, the battery cell is the battery cell according to any one of claims 1-9, and the tabs are electrically connected to the battery cell Between the main body and the pole.