CN209249626U - A wound lithium-ion battery structure - Google Patents

Abstract

The utility model belongs to the technical field of lithium ion battery, especially, relate to a coiling type lithium ion battery structure, including stack in proper order and the head staggered by interior first pole piece and the second pole piece of coiling outside to, first pole piece with the polarity of second pole piece is opposite, first pole piece with be provided with the barrier film between the second pole piece, the head of first pole piece is provided with first utmost point ear, the first utmost point ear that the shape size is the same is pasted correspondingly in the two sides of first utmost point ear and is equipped with first utmost point ear glue, the head of second pole piece is provided with the second utmost point ear, the second utmost point ear glue that the shape size is the same is pasted correspondingly in the two sides of second utmost point ear. Compared with the prior art, the utility model discloses the utmost point ear of having avoided surpassing the pole piece glues the adhesion effect to the barrier film to reach the effect that improves naked electric core utmost point ear margin accuracy.

Description

A wound lithium-ion battery structure

technical field

The utility model belongs to the technical field of lithium ion batteries, in particular to a wound lithium ion battery structure.

Background technique

Lithium-ion batteries have been widely used in notebook computers, mobile communications, etc. due to their advantages such as high specific energy and high voltage. With the upgrading of digital products and smart terminals, the requirements for the size of lithium-ion batteries are getting higher and higher. It has become an industry trend to design battery sizes based on the size of batteries required by terminal products.

According to the current winding process, in order to prevent the tab burr from piercing the isolation film and short circuit due to contact with the pole piece, it is necessary to paste a piece of tab glue on the tab. However, the tab glue needs to exceed the pole piece in the width direction of the pole piece, and the tab glue that covers the tab to the metal belt area between the pole pieces. The part of the tab glue that exceeds the pole piece will cause adhesion to the isolation film, thereby affecting The accuracy of the tab edge distance of the bare cell.

Utility model content

One of the purposes of this utility model is to provide a winding lithium ion battery structure for the deficiencies of the prior art, which avoids the adhesion of the ear glue beyond the pole piece to the isolation film, thereby achieving the improvement of the battery life of the bare cell. Effect of pole margin accuracy.

In order to achieve the above object, the utility model adopts the following technical solutions:

A winding lithium-ion battery structure, including a first pole piece and a second pole piece wound from inside to outside, which are stacked in sequence and whose heads are staggered, the first pole piece and the second pole piece are The polarity is opposite, a separator is provided between the first pole piece and the second pole piece, and a first tab is provided on the head of the first pole piece, and the two sides of the first tab correspond to The first tab glue with the same shape and size is attached to the ground, the head of the second pole piece is provided with a second tab, and the two sides of the second tab are correspondingly attached with second tabs with the same shape and size. Pole ear gel.

It should be noted that, compared with the conventional winding structure, the utility model correspondingly sticks a first lug glue/second lug glue with the same shape and size on both sides of the first lug/second lug, Since the first ear glue/second ear glue on both sides are completely overlapped, it covers the sticky part where the ear glue exceeds the pole piece when the original single-sided glue is pasted, avoiding the adhesion of the ear glue to the isolation film , thus avoiding the influence on the ear margin of the bare cell.

As an improvement of the wound lithium ion battery structure described in the present invention, from the innermost circle to the outermost circle of the wound lithium ion battery structure, the first pole pieces sequentially include the first blank set fluid, a first single-sided current collector, and a first double-sided current collector.

As an improvement of the wound lithium-ion battery structure described in the present invention, the first blank current collector is a half circle, the first single-sided current collector is a circle, and the first single-sided current collector A first active material layer is coated on one side facing the outer ring of the wound lithium-ion battery structure, and both sides of the first double-sided current collector are coated with the first active material layer.

As an improvement to the structure of the wound lithium ion battery described in the present invention, the first green glue is pasted on the side of the first single-sided current collector that is not coated with the first active material layer.

As an improvement of the structure of the wound lithium ion battery described in the present invention, from the innermost circle to the outermost circle of the wound lithium ion battery structure, the second pole piece includes a second blank set in sequence fluid, a second double-sided current collector and a second single-sided current collector.

As an improvement of the wound lithium-ion battery structure described in the present invention, the second blank current collector is a half circle, and both sides of the second double-sided current collector are coated with a second active material layer, The second active material layer is coated on a side of the second single-sided current collector facing the inner ring of the wound lithium-ion battery structure.

As an improvement to the structure of the wound lithium-ion battery described in the present invention, the second pole piece is provided with a second green glue at the end of the second active material layer.

The beneficial effect of the utility model is that: the utility model provides a wound lithium ion battery structure, including the first pole piece and the second pole piece wound from inside to outside, which are stacked in sequence and whose heads are staggered. The polarity of the first pole piece is opposite to that of the second pole piece, an isolation film is arranged between the first pole piece and the second pole piece, and a first pole piece is arranged on the head of the first pole piece. ears, the two sides of the first tab are correspondingly attached with the first tab glue of the same shape and size, the head of the second pole piece is provided with a second tab, and the two sides of the second tab are Correspondingly, a second ear glue with the same shape and size is attached. Compared with the prior art, the utility model avoids the adhesion of the lug glue beyond the pole piece to the isolation film, thereby achieving the effect of improving the accuracy of the lug edge distance of the bare cell.

Description of drawings

Fig. 1 is a structural schematic diagram of a winding lithium-ion battery in the present invention.

Fig. 2 is a schematic structural view of the first pole piece in the present invention.

Fig. 3 is a schematic structural view of the second pole piece in the present invention.

Among them: 1-the first pole piece, 2-the second pole piece, 3-the isolation membrane, 4-the first pole ear, 5-the second pole ear, 6-the first pole ear glue, 7-the second pole ear glue , 8-first active material layer, 9-second active material layer, 10-first green glue, 11-second green glue, 101-first blank current collector, 102-first single-sided current collector, 103- The first double-sided current collector, 201 - the second blank current collector, 202 - the second double-sided current collector, 203 - the second single-sided current collector.

Detailed ways

The utility model will be further described in detail below in conjunction with the specific implementation and the accompanying drawings, but the implementation of the utility model is not limited thereto.

As shown in Figures 1 to 3, a winding lithium-ion battery structure includes a first pole piece 1 and a second pole piece 2 wound from inside to outside, which are stacked in sequence and whose heads are staggered. 1. The polarity of the second pole piece 2 is opposite to that of the second pole piece 2. A separator 3 is provided between the first pole piece 1 and the second pole piece 2. The head of the first pole piece 1 is provided with a first tab 4. The first pole piece The two sides of the ear 4 are correspondingly attached with the first tab glue 6 of the same shape and size, the head of the second pole piece 2 is provided with the second tab 5, and the two sides of the second tab 5 are correspondingly attached with The second pole ear glue 7 with the same shape and size.

Further, from the innermost circle to the outermost circle of the wound lithium-ion battery structure, the first pole piece 1 includes a first blank current collector 101 , a first single-sided current collector 102 and a first double-sided current collector 103 in sequence. The first blank current collector 101 is a half circle, the first single-sided current collector 102 is a circle, and the first single-sided current collector 102 is coated with a first active material layer on the side facing the outer ring of the wound lithium-ion battery structure 8. Both sides of the first double-sided current collector 103 are coated with the first active material layer 8 . The first green glue 10 is pasted on the side of the first single-sided current collector 102 that is not coated with the first active material layer 8 .

Further, from the innermost circle to the outermost circle of the wound lithium-ion battery structure, the second pole piece 2 includes a second blank current collector 201 , a second double-sided current collector 202 and a second single-sided current collector 203 in sequence. The second blank current collector 201 is a half circle, both sides of the second double-sided current collector 202 are coated with the second active material layer 9, and the second single-sided current collector 203 faces one side of the inner ring of the wound lithium-ion battery structure It is coated with a second active material layer 9 . The second pole piece 2 is provided with a second green glue 11 at the end of the second active material layer 9 .

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also change and modify the above embodiment. Therefore, the utility model is not limited to the above specific implementation manners, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the utility model shall belong to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (7)

1. A winding lithium-ion battery structure, characterized in that: it includes a first pole piece and a second pole piece wound from inside to outside that are stacked in sequence and whose heads are staggered, the first pole piece and the The polarity of the second pole piece is opposite, a separator is provided between the first pole piece and the second pole piece, a first tab is provided on the head of the first pole piece, and a first tab is provided on the head of the first pole piece. The two sides of the tab are correspondingly attached with the first tab glue of the same shape and size, the head of the second pole piece is provided with the second tab, and the two sides of the second tab are correspondingly attached with Second pole ear gels of the same shape and size. 2. The wound lithium ion battery structure according to claim 1, characterized in that: from the innermost circle to the outermost circle of the wound lithium ion battery structure, the first pole pieces sequentially include first A blank current collector, a first single-sided current collector, and a first double-sided current collector. 3. The wound lithium ion battery structure according to claim 2, characterized in that: the first blank current collector is a half circle, the first single-sided current collector is a circle, and the first single-sided current collector is a circle. The side of the current collector facing the outer ring of the wound lithium-ion battery structure is coated with a first active material layer, and both sides of the first double-sided current collector are coated with the first active material layer. 4 . The wound lithium-ion battery structure according to claim 3 , wherein the first green glue is pasted on the side of the first single-sided current collector that is not coated with the first active material layer. 5. The wound lithium-ion battery structure according to claim 1, characterized in that: from the innermost circle to the outermost circle of the wound lithium-ion battery structure, the second pole pieces sequentially include the second Blank current collector, second double-sided current collector and second single-sided current collector. 6. The wound lithium ion battery structure according to claim 5, characterized in that: the second blank current collector is a half circle, and both sides of the second double-sided current collector are coated with the second active material layer, the second single-sided current collector is coated with the second active material layer on the side facing the inner ring of the wound lithium-ion battery structure. 7 . The wound lithium ion battery structure according to claim 6 , wherein the second pole piece is provided with a second green glue at the end of the second active material layer. 8 .