CN205376667U - Naked electric core - Google Patents

Abstract

The utility model provides a bare electric core, comprising: a first pole piece; a second pole piece, opposite in polarity to the first pole piece; an isolation film, which separates the adjacent first pole piece from the second pole piece ; The first tab is electrically connected to the corresponding first pole piece and one end of the first tab protruding out of the isolation film is fixedly connected to form a first tab assembly; the second tab is electrically connected to the corresponding second pole piece. The pole piece, one end of the second pole protruding out of the isolation membrane is fixedly connected to form the second tab assembly; the insulating colloid is arranged on the second pole piece and the first tab assembly directly opposite to the first tab assembly parts, and/or arranged between the first pole piece directly opposite to the second tab collection part and the second tab collection part. When the bare cell is squeezed or collided, the insulating colloid can prevent the direct contact between the first tab assembly and the second pole piece, and/or avoid the direct contact between the second tab assembly and the first pole piece, preventing the bare battery The internal short circuit of the cell improves the safety performance of the bare cell.

Description

bare cell

technical field

The utility model relates to the battery field, in particular to a bare electric core.

Background technique

As an important process component of lithium-ion batteries, the stacking process is a battery formed by repeated stacking processes of an anode pole piece, a separator film, and a cathode pole piece. The alignment of the positive and negative pole pieces is very important for the safety of lithium-ion batteries. It has a very important impact, especially in the position where the tabs of the laminated battery are bent and connected, there is a risk of short circuit.

The traditional method prevents direct contact between the bent and connected tabs and the positive electrode piece by pasting adhesive tape. This adhesive tape not only requires high viscosity, but also is thicker than ordinary adhesive tape; if the adhesive tape is not viscous enough, it will It is easy to loosen or shift under liquid immersion, and the result is no protection; too thick adhesive paper affects the energy density of the entire battery cell, and also affects the appearance of the battery cell; so the traditional adhesive paper is difficult to adapt to the laminated battery. Technological trends.

Utility model content

In view of the problems existing in the background technology, the purpose of this utility model is to provide a bare cell, which can prevent the contact between the tab and the pole piece of the opposite polarity, prevent the internal short circuit of the bare cell, and improve the safety performance of the bare cell .

In order to achieve the above object, the utility model provides a bare cell, which includes: a first pole piece; a second pole piece, opposite in polarity to the first pole piece; The first pole piece is separated from the second pole piece; the first pole piece is electrically connected to the corresponding first pole piece, and the end of the first pole piece protruding out of the isolation film is fixedly connected to form the first pole piece set; the second pole piece , electrically connected to the corresponding second pole piece, one end of the second tab extending out of the isolation film is fixedly connected to form the second tab collection part; and the insulating colloid is arranged on the first tab collection part directly opposite to the first tab collection part Between the second pole piece and the first tab assembly, and/or between the first pole piece directly opposite to the second tab assembly and the second tab assembly.

The beneficial effects of the utility model are as follows:

In the bare electric core according to the utility model, since the insulating colloid is arranged between the second pole piece directly opposite to the first tab assembly and the first tab assembly, and/or arranged between the second tab assembly between the first pole piece and the second tab assembly directly opposite to each other, so when the first tab assembly and/or the second tab assembly are squeezed or collided, the insulating colloid can prevent the first pole The lug collection part is in direct contact with the second pole piece, and/or the second tab collection part is prevented from directly contacting the first pole piece, so as to prevent the internal short circuit of the bare cell and improve the safety performance of the bare cell.

Description of drawings

Fig. 1 is a schematic diagram of a bare cell according to the present invention, showing a first tab assembly and a first position where insulating colloid is provided in an embodiment;

Fig. 2 is a schematic diagram of a bare cell according to the present invention, showing a first lug assembly part and a second position where insulating colloid is provided in an embodiment;

Fig. 3 is a schematic diagram of a bare cell according to the present invention, showing another embodiment of a first lug assembly and a first position where insulating colloid is provided;

Fig. 4 is a schematic diagram of a bare cell according to the present invention, showing another embodiment of a first tab assembly and a second position where insulating colloid is provided;

Fig. 5 is a schematic diagram of a bare cell according to the present invention, showing a second tab assembly and a first position where insulating colloid is provided in an embodiment;

Fig. 6 is a schematic diagram of a bare cell according to the present invention, showing a second tab assembly and a second position where insulating colloid is provided in an embodiment;

Wherein, the reference signs are explained as follows:

1 first pole piece 6 insulating colloid

2 The second pole piece 7 The first connecting piece

3 Isolation film 8 The second connecting piece

4 The first tab C1 The first tab collection part

5 The second tab C2 The second tab collection part

detailed description

The bare cell of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to Figures 1 to 6, the bare cell according to the present invention includes: a first pole piece 1; a second pole piece 2, opposite in polarity to the first pole piece 1; an isolation film 3, used to separate the adjacent The first pole piece 1 is separated from the second pole piece 2; the first pole piece 4 is electrically connected to the corresponding first pole piece 1 and one end of the first pole piece 4 protruding out of the separator 3 is fixedly connected to form a first The tab collection part C1; the second tab 5 is electrically connected to the corresponding second pole piece 1, and one end of the second tab 5 protruding out of the isolation film 3 is fixedly connected to form the second tab collection part C2; and insulation The colloid 6 is arranged between the second pole piece 2 directly opposite to the first tab assembly C1 and the first tab assembly C1, and/or arranged on the first pole piece directly opposite to the second tab assembly C2. Between the pole piece 1 and the second tab collection part C2.

In the bare electric core according to the present utility model, since the insulating colloid 6 is arranged between the second pole piece 2 and the first tab assembly C1 directly opposite to the first tab assembly C1, and/or is arranged between the first tab assembly C1 and Between the first pole piece 1 and the second tab assembly C2 directly opposite to the second tab assembly C2, the first tab assembly C1 and/or the second tab assembly C2 are squeezed and collided At this time, the insulating colloid 6 can prevent the first tab collection part C1 from directly contacting the second pole piece 2, and/or prevent the second tab collection part C2 from directly contacting the first pole piece 1, and prevent the internal short circuit of the bare cell. Improve the safety performance of bare cells.

In the bare cell according to the present invention, referring to FIG. 2 and FIG. 4 , in an embodiment, the insulating colloid 6 is also arranged between adjacent first tabs 4 . When the first tab 4 is squeezed or collided, the second pole piece 2 directly opposite to the first tab 4 has the risk of contacting the first tab 4, and the adjacent first tab 4 The insulating colloid 6 between them can separate the first tab 4 and the second pole piece 2, prevent the internal short circuit of the bare cell, and improve the safety performance of the bare cell.

In the bare cell according to the present invention, referring to FIG. 6 , in an embodiment, the insulating colloid 6 is also disposed between the adjacent second tabs 5 . When the second tab 5 is squeezed or collided, the first pole piece 1 directly opposite to the second tab 5 has the risk of contacting the second tab 5, while the adjacent second tab 5 The insulating colloid 6 in between can separate the second tab 5 and the first pole piece 1, prevent the internal short circuit of the bare cell, and improve the safety performance of the bare cell.

In the bare cell according to the present invention, in an embodiment, the insulating glue 6 is a thermally conductive insulating glue. The insulating colloid 6 made of thermally conductive insulating glue can improve the heat dissipation performance of the bare cell and avoid heat accumulation inside the bare cell.

In the bare cell according to the present invention, in an embodiment, the thermally conductive and insulating glue is a thermosetting glue.

In the bare electric core according to the present invention, in an embodiment, the first tab 4 is welded or bonded to the corresponding first pole piece 1 .

In the bare electric core according to the present invention, in an embodiment, the second tab 5 is welded or bonded to the corresponding second pole piece 2 .

In the bare cell according to the present invention, in one embodiment, the first tab 4 is punched out from the first pole piece 1 .

In the bare cell according to the present invention, in an embodiment, the second tab 5 is punched out from the second pole piece 2 .

In the bare cell according to the present invention, referring to FIG. 1 to FIG. 4 , in an embodiment, the bare cell further includes: a first connecting piece 7 electrically connected to the first lug assembly part C1 .

In the bare electric core according to the present invention, referring to Fig. 1 and Fig. 2, in one embodiment, the insulating colloid 6 is also arranged on the second pole piece 2 and the first connecting piece 7 directly opposite to the first connecting piece 7 between. When the first connecting piece 7 is squeezed and collided, the insulating colloid 6 can separate the second pole piece 2 directly opposite to the first connecting piece 7 from the first connecting piece 7, avoiding the second pole piece 2 and the first connecting piece 7. The connecting piece 7 is in direct contact to prevent the internal short circuit of the bare cell and improve the safety performance of the bare cell. In the bare cell according to the present invention, referring to FIG. 5 and FIG. 6 , in an embodiment, the bare cell further includes: a second connecting piece 8 electrically connected to the second lug assembly part C2 .

In the bare electric core according to the present invention, referring to Fig. 5 and Fig. 6, in one embodiment, the insulating colloid 6 is also arranged on the first pole piece 1 and the second connection piece 8 directly opposite to the second connection piece 8 between. When the second connection piece 8 is squeezed and collided, the insulating colloid 6 can separate the first pole piece 1 and the second connection piece 8 directly opposite to the second connection piece 8, so as to avoid the first pole piece 1 and the second connection piece 8. The connecting piece 8 is in direct contact to prevent the internal short circuit of the bare cell and improve the safety performance of the bare cell.

In the bare electric core according to the utility model, in one embodiment, the first pole piece 1 is a positive pole piece and the second pole piece 2 is a negative pole piece; or the first pole piece 1 is a negative pole piece and the second pole piece is a negative pole piece. The pole piece 2 is a positive pole piece.

In the bare cell according to the present invention, in an embodiment, the bare cell is a laminated battery, a multi-tab wound battery or a stacked wound battery.

Claims (10)

1. A bare cell, comprising: The first pole piece (1); The second pole piece (2) is opposite in polarity to the first pole piece (1); An isolation film (3), used to separate adjacent first pole pieces (1) and second pole pieces (2); The first tab (4) is electrically connected to the corresponding first pole piece (1) and one end of the first tab (4) protruding out of the isolation membrane (3) is fixedly connected to form the first tab collection part (C1 ); The second tab (5) is electrically connected to the corresponding second pole piece (1), and one end of the second tab (5) protruding out of the isolation film (3) is fixedly connected to form the second tab assembly (C2 ); It is characterized in that, Bare cells also include: The insulating colloid (6) is arranged between the second pole piece (2) directly opposite to the first tab collection part (C1) and the first tab collection part (C1), and/or arranged between the second pole piece Between the first pole piece (1) and the second tab assembly (C2) directly opposite to the lug assembly (C2). 2. The bare cell according to claim 1, characterized in that the insulating colloid (6) is also arranged between adjacent first tabs (4). 3. The bare cell according to claim 1, characterized in that the insulating colloid (6) is also arranged between adjacent second tabs (5). 4. The bare cell according to claim 1, characterized in that the insulating glue (6) is a thermally conductive insulating glue. 5. The bare cell according to claim 1, characterized in that, The first tab (4) is welded or bonded to the corresponding first pole piece (1); and/or The second pole lug (5) is welded or bonded to the corresponding second pole piece (2). 6. The bare cell according to claim 1, characterized in that, The first tab (4) is die-cut from the first pole piece (1); and/or The second tab (5) is punched from the second pole piece (2). 7. The bare cell according to claim 1, wherein the bare cell further comprises: The first connecting piece (7) is electrically connected to the first tab assembly (C1). 8. The bare cell according to claim 7, characterized in that the insulating colloid (6) is also provided on the second pole piece (2) directly opposite to the first connecting piece (7) and the first connecting piece (7) )between. 9. The bare cell according to claim 1, wherein the bare cell further comprises: The second connecting piece (8) is electrically connected to the second tab assembly (C2). 10. The bare cell according to claim 9, characterized in that the insulating colloid (6) is also arranged on the first pole piece (1) and the second connection piece (8) directly opposite to the second connection piece (8) )between.