CN220821860U - Tab, battery core and battery - Google Patents

Abstract

The utility model provides a tab, an electric core and a battery, and relates to the technical field of batteries. The tab comprises a first region and two second regions connected to the first region; the first area is arranged in a triangle shape and is provided with a bottom edge for connecting the pole piece and two side edges adjacent to the bottom edge, and the included angles between the two side edges and the bottom edge are acute angles; the second area is arranged in an arc shape, and the straight edge and the side edge of the second area are overlapped. When the pole piece is wound to form the battery cell, the first area is more directly influenced by the pole piece, and the first area can be smoothly bent and deformed under the drive of the pole piece. Because the second area is arranged to be arched, a flat structure extending along the side edge of the first area is formed, the first area can smoothly drive the second area to bend and deform, the situation that deformation differences of different parts of the tab are overlarge is avoided, and further the tab is prevented from being folded, so that the yield can be improved.

Description

Tab, battery core and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a tab, an electric core and a battery.

Background

The tab is a raw material of a lithium ion polymer battery product and is connected with the pole piece in the battery core. The tab connected with the positive plate is a positive tab and is further connected with the positive electrode of the battery. The tab connected with the negative electrode plate is a negative electrode tab and is further connected with the negative electrode of the battery.

The existing tabs are generally square. However, during the process of winding the stacked positive and negative electrode sheets to form the battery cell, one side of the tab, which is close to the electrode sheet, is bent and deformed along with the electrode sheet. In contrast, the side of the tab remote from the pole piece is less affected by the pole piece. Therefore, the deformation of the two sides of the tab is inconsistent, the tab is folded, and the yield is reduced.

Disclosure of utility model

In order to solve the problems in the prior art, one of the purposes of the present utility model is to provide a tab.

The utility model provides the following technical scheme:

A tab comprises a first region and two second regions connected to the first region;

The first area is arranged in a triangle, and is provided with a bottom edge for connecting the pole piece and two side edges adjacent to the bottom edge, and the included angles between the two side edges and the bottom edge are acute angles;

The second areas are arranged in an arc shape, wherein the straight edge of one second area is overlapped with one side edge, and the straight edge of the other second area is overlapped with the other side edge.

As a further alternative to the tab, a tangent line to an end of the arcuate edge of the second region remote from the bottom edge is parallel to the bottom edge.

As a further alternative to the tab, the side edge and the bottom edge have an angle of 45 °.

As a further alternative scheme for the tab, an included angle between a tangent line of one end of the arc-shaped edge of the second region, which is far away from the bottom edge, and the bottom edge is less than or equal to 45 degrees.

As a further alternative scheme for the tab, the area of the first region is S1, and the area of the second region is S2, wherein S1/S2 is less than or equal to 1 and less than or equal to (pi-1).

As a further alternative scheme for the tab, the height of the first area is H1, and the height of the second area is H2, wherein H2/H1 is more than 0 and less than or equal to #）。

It is another object of the present utility model to provide a battery cell.

The utility model provides the following technical scheme:

The battery cell comprises a pole piece and the pole lug, wherein the bottom edge is connected with the pole piece.

As a further alternative to the battery cell, the length of the bottom edge is smaller than half of the width of the battery cell, and the height of the first region is not smaller than the sum of half of the thickness of the battery cell and the soldering width of the tab.

It is still another object of the present utility model to provide a battery.

The utility model provides the following technical scheme:

A battery comprises a shell, a cover plate and the battery cell, wherein the battery cell is accommodated in the shell;

The cover plate is connected with the shell, a switching piece is arranged on the cover plate, and the switching piece is connected with one end of the lug, which is far away from the pole piece.

As a further alternative to the battery, the height of the first region is less than half the difference between the thickness of the cover plate and the height of the land of the tab.

The embodiment of the utility model has the following beneficial effects:

In the tab, the bottom edge of the first region is used for connecting the pole piece. When the pole piece is wound to form the battery cell, the first area is more directly influenced by the pole piece, and the first area can be smoothly bent and deformed under the drive of the pole piece. In contrast, the second regions connected to both sides of the first region are not directly affected by the pole pieces, but are more bent and deformed under the driving of the first region. On this basis, because the second region sets up to the arch, forms the platykurtic structure that extends along the side of first region, so first region can drive second region bending deformation smoothly, avoids appearing the too big condition of deformation difference in the different positions of utmost point ear, and then avoids utmost point ear to discount to can improve the yield.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic diagram of an overall structure of a battery cell according to an embodiment of the present utility model;

Fig. 2 is a schematic diagram of an overall structure of a tab according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing the principle of the pole piece deforming the first region;

FIG. 4 is a schematic diagram showing the principle of the first region deforming the second region;

Fig. 5 is a schematic structural view of a tab according to an embodiment of the present utility model;

Fig. 6 is a schematic structural view of a tab according to another embodiment of the present utility model;

Fig. 7 is a schematic structural view of a tab according to another embodiment of the present utility model;

Fig. 8 is a schematic structural view of a tab according to another embodiment of the present utility model;

fig. 9 is a schematic diagram showing an area relationship between a first area and a second area in a tab according to an embodiment of the present utility model;

fig. 10 is a schematic diagram illustrating a height relationship between a first area and a second area in a tab according to an embodiment of the present utility model.

Description of main reference numerals:

100-electrode lugs; 110-a first region; 111-bottom side; 112-side; 120-a second region; 121-straight edge; 122-arc edge; 200-pole piece.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

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 formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the 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.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Examples

Referring to fig. 1 and 2 together, the present embodiment provides a tab 100, which may be a positive tab or a negative tab, and the present embodiment is not limited thereto. The tab 100 includes a first region 110 and two second regions 120 connected to the first region 110.

The first region 110 is arranged in a triangle shape, having a base 111 and two sides 112 adjacent to the base 111. Wherein bottom edge 111 is used to connect pole piece 200. When the bottom 111 is connected to the positive electrode tab 200, the tab 100 is a positive electrode tab. When the bottom 111 is connected to the negative electrode tab 200, the tab 100 is a negative electrode tab.

In addition, the two side edges 112 form an acute angle with the bottom edge 111.

Both second regions 120 are arranged in an arcuate shape, in particular a inferior arcuate shape, having a straight edge 121 and an arcuate edge 122. The straight edge 121 of one of the second regions 120 overlaps one of the side edges 112 and the straight edge 121 of the other second region 120 overlaps the other side edge 112.

In the tab 100, since the bottom 111 is connected to the pole piece 200, the bottom 111 and the pole piece 200 are synchronously bent and deformed when the pole piece 200 is wound to form a battery cell. In addition, the strip-shaped portion A1 of the tab 100 adjacent to and parallel to the bottom edge 111 is deformed to bend with the bottom edge 111, and the other strip-shaped portion A2 adjacent to and parallel to the strip-shaped portion A1 is deformed to bend with the strip-shaped portion A1. Similarly, the force generated by the bending deformation of the pole piece 200 is gradually transferred to the end of the tab 100 away from the pole piece 200.

With reference to fig. 3, it will be appreciated that as the distance from pole piece 200 increases, the force gradually decreases, and the band portion a (n+1) directly affected by band portion An also gradually becomes shorter. Finally, each belt-shaped part forms a triangular first area 110, and the first area 110 is directly affected by the pole piece 200, so that the first area can be smoothly bent and deformed under the drive of the pole piece 200.

In contrast, the second regions 120 connected to both sides of the first region 110 are not directly affected by the pole piece 200, but are more bent and deformed by the first region 110.

Referring to fig. 4, similarly, since the straight edge 121 of the second region 120 overlaps the side edge 112 of the first region 110, the straight edge 121 can be bent and deformed synchronously with the first region 110. On this basis, the band-shaped portion B1 adjacent to and parallel to the straight edge 121 in the second region 120 is deformed to bend with the straight edge 121, and the other band-shaped portion B2 adjacent to and parallel to the band-shaped portion B1 is deformed to bend with the band-shaped portion B1. By analogy, the force generated by the bending deformation of the first region 110 is gradually transferred to the end of the second region 120 away from the first region 110, and gradually decreases during the transfer.

On this basis, because the second region 120 is configured to be arcuate, and forms a flat structure extending along the side 112 of the first region 110, the first region 110 can smoothly drive the second region 120 to bend and deform along the direction perpendicular to the side 112, so as to avoid the situation that deformation differences of different parts of the tab 100 are too large, and further avoid the tab 100 from being folded, thereby improving the yield.

In contrast, the conventional tab 100 is generally provided in a square shape, and the second region 120 formed by dividing in the above manner is triangular, and has a larger dimension in a direction perpendicular to the side 112 of the first region 110. When the force generated by the bending deformation of the first region 110 is transferred to the end of the second region 120 remote from the first region 110, the force has been reduced to be insufficient to bring the end of the second region 120 remote from the first region 110 into bending deformation. At this time, the deformation difference between the end of the second region 120 away from the first region 110 and other portions of the tab 100 is large. In other words, the deformation difference between the two top corners of the square tab 100, which is far from the pole piece 200, and other parts is large, so that the tab 100 is easily folded.

In the present embodiment, the first region 110 and the second region 120 are integrally formed.

Referring to fig. 5, in some embodiments of the present application, a tangent line to an end of the arcuate edge 122 of the second region 120 remote from the bottom edge 111 is parallel to the bottom edge 111.

At this time, the tangent lines of the ends of the arc edges 122 of the two second regions 120 far from the bottom edge 111 coincide, and the outer edge of the entire tab 100 is in arc transition at the vertex of the first region 110, which is beneficial for the tab 100 to deform uniformly along with the pole piece 200.

Further, in some embodiments of the present embodiment, the side edge 112 is at an angle of 45 ° to the bottom edge 111.

At this time, the first area 110 is in the shape of an isosceles right triangle, and the two sides 112 have equal lengths. The two second regions 120 have the same shape, and the first region 110 and the two second regions 120 together form the semicircular tab 100.

Referring to fig. 6 and 7 together, in other embodiments of the present embodiment, the angle between the two side edges 112 and the bottom edge 111 may be other than 45 °. On this basis, the lengths of the two side edges 112 may or may not be equal.

Referring to fig. 8, in another embodiment of the present application, a tangent line of an end of the arc-shaped edge 122 of the second region 120 away from the bottom edge 111 obliquely intersects the bottom edge 111. And the included angle between the tangential line and the bottom edge 111 is theta, so that theta is less than or equal to 45 degrees.

When θ is larger, the shape of the second region 120 tends to be flat, which is more beneficial for the first region 110 to drive the second region 120 to bend and deform, so as to further reduce the possibility of bending the tab 100.

In contrast, as θ increases, the area of the second region 120 continuously decreases, the shape of the entire tab 100 gradually tends to be triangular, and the width of the end of the tab 100 away from the pole piece 200 gradually decreases, which is unfavorable for the subsequent welding and assembling process.

Alternatively, the angle between the tangent line and the bottom edge 111 may be 5 °, 15 °, 25 °, 35 °, 45 °, or any value not greater than 45 °.

Preferably, the angle between the tangent line and the bottom edge 111 is 25 °.

Referring to FIG. 9, further, in some embodiments of the present application, 1.ltoreq.S1/S2.ltoreq.pi.1 is satisfied when the area of the first region 110 is denoted as S1 and the area of the second region 120 is denoted as S2.

Similarly, when S1/S2 is larger, the shape of the second region 120 tends to be flat, which is more beneficial for the first region 110 to drive the second region 120 to bend and deform, further reducing the possibility of bending the tab 100, but is not beneficial for the subsequent welding and assembling process.

Alternatively, the ratio of the areas of the first region 110 to the second region 120 may be 1, 1.3, 1.5, 2, pi-1, or any value in the range of 1 to (pi-1).

Preferably, the ratio of the areas of the first region 110 and the second region 120 is 2.

Referring to FIG. 10, in some embodiments of the present application, the height of the first region 110 is H1, and the height of the second region 120 is H2, thus satisfying 0 < H2/H1 +.）。

Similarly, the smaller the H2/H1, the flatter the shape of the second region 120, which is more beneficial for the first region 110 to bend and deform the second region 120, further reducing the possibility of bending the tab 100, but is not beneficial for the subsequent welding and assembling process.

Alternatively, the ratio of the height of the second region 120 to the first region 110 may be 0.1, 0.15, 0.2, 0.25, ("a")) Or 0 to (/ >)) Any value within the range.

Preferably, the ratio of the height of the second region 120 to the first region 110 is 0.25.

In summary, in the tab 100, when the electrode sheet 200 is wound to form the battery cell, the first region 110 is more directly affected by the electrode sheet 200, and can be smoothly bent and deformed under the driving of the electrode sheet 200. In contrast, the second regions 120 connected to both sides of the first region 110 are not directly affected by the pole piece 200, but are more bent and deformed by the first region 110. On this basis, because the second region 120 is configured to be arcuate and forms a flat structure extending along the side edge 112 of the first region 110, the first region 110 can smoothly drive the second region 120 to bend and deform, so as to avoid the situation that deformation differences of different parts of the tab 100 are too large, and further avoid the tab 100 from being folded, thereby improving the yield.

Referring to fig. 1 again, the present embodiment further provides a battery cell, including a pole piece 200 and the tab 100. Wherein, the bottom edge 111 of the first region 110 of the tab 100 is connected with the pole piece 200.

Specifically, the battery cell includes a positive electrode tab and a negative electrode tab, and the tab 100 is divided into a positive electrode tab and a negative electrode tab. The positive electrode lug is connected with the positive electrode plate, and the negative electrode lug is connected with the negative electrode plate.

Further, the length of the bottom edge 111 is less than half the width of the cell, i.e., the width of the tab 100 is less than half the width of the cell.

In addition, when the plurality of tabs 100 are welded together, the tab 100 located at the outer side is drawn toward the middle of the battery cell and bent. In order to ensure that the outer tab 100 can still be welded with other tabs 100 after being bent, the height of the first region 110 is not less than half the thickness of the battery cell and the welding width of the tab 100.

The embodiment also provides a battery, which comprises a shell, a cover plate and the battery core.

Wherein, one end of casing is open and is set up. The battery cell is placed from the open end of the shell and is accommodated in the shell. The cover plate is connected with the open end of the shell to seal the shell.

In addition, a switching piece is arranged on the cover plate, and the switching piece is connected with one end, far away from the pole piece 200, of the pole lug 100.

When the battery is assembled, the battery core is placed in the shell, the lug 100 is welded with the adapter piece on the cover plate, and finally the cover plate is covered on the shell, so that the battery core is packaged in the shell.

Further, the height of the first region 110 is less than half the difference between the thickness of the cover plate and the height of the bonding pad of the interposer web.

Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (10)

1. The tab is characterized by comprising a first area and two second areas connected with the first area;

The first area is arranged in a triangle, and is provided with a bottom edge for connecting the pole piece and two side edges adjacent to the bottom edge, and the included angles between the two side edges and the bottom edge are acute angles;

The second areas are arranged in an arc shape, wherein the straight edge of one second area is overlapped with one side edge, and the straight edge of the other second area is overlapped with the other side edge.

2. The tab of claim 1, wherein a tangent to an end of the arcuate edge of the second region distal from the base edge is parallel to the base edge.

3. The tab of claim 2, wherein the side edge is at an angle of 45 ° to the bottom edge.

4. The tab of claim 1, wherein the angle θ between a tangent to an end of the arcuate edge of the second region distal from the base edge and the base edge is equal to or less than 45 °.

5. The tab of any one of claims 1-4, wherein the first region has an area S1 and the second region has an area S2,1 +.s1/s2 +..

6. The tab of any one of claims 1-4 wherein the first region has a height H1 and the second region has a height H2,0 < H2/H1 +.）。

7. An electrical core comprising a pole piece and the tab of any one of claims 1-6, the bottom edge being connected to the pole piece.

8. The cell of claim 7, wherein the length of the bottom edge is less than half the width of the cell and the height of the first region is not less than the sum of half the thickness of the cell and the solder width of the tab.

9. A battery comprising a housing, a cover, and the cell of claim 7 or 8, the cell being housed within the housing;

The cover plate is connected with the shell, a switching piece is arranged on the cover plate, and the switching piece is connected with one end of the lug, which is far away from the pole piece.

10. The battery of claim 9, wherein the height of the first region is less than half the difference between the thickness of the cover plate and the land height of the tab.