CN219626758U

CN219626758U - Soft package lithium ion battery hem structure

Info

Publication number: CN219626758U
Application number: CN202320277337.1U
Authority: CN
Inventors: 许久东; 于子龙; 程壮; 张润荣; 秦锐; 郑明清
Original assignee: Zhejiang Liwei Energy Technology Co ltd
Current assignee: Zhejiang Liwei Energy Technology Co ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-09-01
Anticipated expiration: 2033-02-15

Abstract

The utility model discloses a soft package lithium ion battery flanging structure, which belongs to the technical field of lithium ion batteries and mainly adopts the technical scheme that: the battery comprises a battery body, the battery body has a battery side, the battery body is last to be covered with the packaging film, the packaging film is in battery side formation battery packaging film seal limit, battery packaging film seal limit is cylinder seal limit, the forging tangent plane on cylinder seal limit is located the inner circle, cylinder seal limit with be connected with the tie coat between the battery side. The utility model improves the energy density and the packaging reliability of the battery core by arranging the sealing edge of the battery packaging film into the cylindrical sealing edge.

Description

Soft package lithium ion battery hem structure

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a soft package lithium ion battery flanging structure.

Background

The soft-package lithium ion battery has the advantages of high energy density, good safety, customization and the like, and has wide application in the fields of digital, wearable equipment, power and the like. .

The packaging bag of the soft package battery is generally an aluminum plastic film, the aluminum plastic film is cut into different sizes according to the types of different battery cells, and the edges of the battery are sealed through the aluminum plastic film in a hot pressing mode to form seal edges.

The folding edges of the soft-package lithium ion battery are mainly divided into two types, namely non-folding edges and single-folding edges, which are spread flatly.

Fig. 1 is a schematic diagram of a non-flanging structure of a soft-package lithium ion battery, wherein the packaging film sealing edge 120 is not subjected to subsequent flanging treatment after being cut, and the packaging film sealing edge 120 is parallel to the battery cell main body 100. In order to ensure the unsealed area and the effective seal width in the soft package lithium ion battery, the seal edge 120 of the packaging film is usually relatively large in width, which seriously affects the energy density of the battery.

Fig. 2 is a schematic diagram of a single-folded-edge flat-spreading structure design of a soft-package lithium ion battery, wherein a packaging film sealing edge is divided into a first sealing edge 121 and a second sealing edge 122, the packaging film sealing edge is folded once after being cut, the first sealing edge 121 is arranged on the second sealing edge 122, the first sealing edge 121 and the second sealing edge 122 are connected to form 180 degrees, and the first packaging film sealing edge 121 and the second packaging film sealing edge 122 are parallel to the battery cell main body 100. Compared with the design of a non-flanging structure, the flanging width of the single-flanging flat-spreading structure is reduced, but the width of the seal edge is still larger due to the spreading structure, so that the energy density of the battery is influenced.

In addition, because the middle layer of the aluminum plastic film is made of metal aluminum, the aluminum plastic film is easy to conduct electricity, and therefore exposed metal aluminum end faces at the cutting seal edges are treated to prevent short circuits. Such as attaching an insulating tape or coating insulating glue, increases the process difficulty. In addition, the width of the effective seal edge is smaller, the packaging strength is affected, the packaging reliability of the battery is reduced, and the service life of the battery is affected.

In view of this, there is a need for improvements in the structure of existing soft-pack lithium ion batteries.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a soft package lithium ion battery flanging structure so as to improve the energy density and the packaging reliability.

The utility model discloses a soft package lithium ion battery flanging structure which comprises a battery main body, wherein the battery main body is provided with a battery side edge, a packaging film is covered on the battery main body, the packaging film forms a battery packaging film sealing edge on the battery side edge, the battery packaging film sealing edge is a cylindrical sealing edge, a forging section of the cylindrical sealing edge is positioned at the innermost ring, and a bonding layer is connected between the cylindrical sealing edge and the battery side edge.

Preferably, the winding number of the cylindrical seal edge is 1-2.

Preferably, the cylindrical seal edge is wound 2 turns and comprises a first winding layer and a second winding layer, and the first winding layer is positioned on the inner ring of the cylindrical seal edge.

Preferably, the diameter of the first winding layer is between 0.5 and 2.5 mm.

Preferably, the diameter of the second winding layer is between 0.7 and 3mm.

Preferably, the battery body has upper and lower planes, and the cylindrical seal side has a height direction not exceeding the upper and lower planes of the battery body.

Preferably, the thickness of the battery body is 1 to 3mm.

Preferably, the packaging film is made of an aluminum plastic film.

Preferably, the adhesive layer is glue.

Preferably, the width of the cylindrical seal edge is between 0.7 and 3mm and is the same as the diameter of the second winding layer.

The utility model has the beneficial effects that:

firstly, the edge folding structure of the cylindrical seal edge can reduce the edge folding width and the edge folding height of the soft package lithium ion battery, thereby being beneficial to improving the utilization space of the battery core and improving the energy density;

secondly, the sealing edge of the battery packaging film is of an inner winding structure, and the forging section is arranged at the end part of the innermost ring, so that metal aluminum at the edge cutting position can be effectively prevented from leaking outwards, and risks such as short circuit and corrosion caused when the battery is contacted with a circuit board are greatly reduced;

thirdly, the hem structure of cylinder seal limit can effectively increase the effective seal width of electric core side, improves electric core encapsulation reliability, effectively prolongs the life of electric core.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a schematic diagram of a non-hemming structure design of a soft package lithium ion battery;

fig. 2 is a schematic diagram of a single-folded-edge flat-spreading structure design of a soft-package lithium ion battery;

fig. 3 is a schematic diagram of a folded edge structure of a soft-pack lithium ion battery according to the present utility model.

Reference numerals illustrate: 100. a battery main body; 110. a battery side; 120. sealing edges of the battery packaging film; 121. sealing the first edge; 122. sealing the second edge; 123. a cylindrical seal edge; 1231. a first winding layer; 1232. a second winding layer; 130. a bonding layer; d1, diameter of the first winding layer; d2, diameter of the second winding layer.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the "first", "second", etc. in this application are for descriptive purposes only and are not intended to specifically indicate a sequential or a cis-position, nor are they intended to limit the utility model, but are merely intended to distinguish between components or operations described in the same technical term, and are not to be construed as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:

the flexible lithium ion battery flanging structure of the utility model is shown in fig. 3, and comprises a battery main body 100, wherein the battery main body 100 is provided with an upper plane, a lower plane and a straight battery side 110, a packaging film is covered on the surface of the battery main body 100, a redundant part of the packaging film extends out of the battery side 110 to form a battery packaging film sealing edge 120, the battery packaging film sealing edge 120 is wound towards the battery side 110 to form a cylindrical sealing edge 123, the cylindrical sealing edge 123 comprises a first winding layer 1231 and a second winding layer 1232, and an adhesive layer 130 is arranged between the battery side 110 and the cylindrical sealing edge 123 and is used for adhering and fixing the cylindrical sealing edge 123.

Specifically, the thickness of the battery body 100 is 1 to 3mm, and in the present embodiment, 3mm; the packaging film is made of an aluminum plastic film, the battery packaging film sealing edge 120 is wound for 1-2 circles towards the battery side 110 along the thickness direction of the battery main body 100, the battery packaging film sealing edge 120 is wound for 2 circles in the embodiment, and the forging section of the cylindrical sealing edge 123 is arranged at the end part of the innermost ring; the diameter D1 of the first winding layer 1231 of the cylindrical seal edge 123 is between 0.5 and 2.5mm, in this embodiment 0.7mm, the diameter D2 of the second winding layer 1232 of the cylindrical seal edge 123 is between 0.7 and 3mm, in this embodiment 1.5mm, the width of the cylindrical seal edge 123 is between 0.7 and 3mm, and the height direction of the cylindrical seal edge 123 does not exceed the upper and lower plane of the battery body 100 as the diameter D2 of the second winding layer 1232; the adhesive layer 130 may be provided as glue or double sided tape, in this embodiment glue is used.

The beneficial effects of the utility model are as follows:

firstly, the edge folding structure of the cylindrical seal edge 123 can reduce the edge folding width and the edge folding height of the soft package lithium ion battery, thereby being beneficial to improving the utilization space of the battery core and improving the energy density;

secondly, the seal edge 120 of the battery packaging film is of an inner winding structure, and the forging section is arranged at the end part of the innermost ring, so that metal aluminum at the edge cutting position can be effectively prevented from leaking outwards, and risks such as short circuit and corrosion caused when the battery is in contact with a circuit board are greatly reduced;

thirdly, the hem structure of cylinder seal limit 123 can effectively increase the effective seal width of electric core side, improves electric core encapsulation reliability, effectively prolongs the life of electric core.

The above is merely an embodiment of the present utility model, and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.

Claims

1. The utility model provides a soft packet of lithium ion battery hem structure, its characterized in that, includes battery main part (100), battery main part (100) have battery side (110), the last packaging film that covers of battery main part (100), the packaging film is in battery side (110) form battery packaging film seal limit (120), battery packaging film seal limit (120) are cylinder seal limit (123), the forging tangent plane of cylinder seal limit (123) is located the inner circle, cylinder seal limit (123) with be connected with tie coat (130) between battery side (110).

2. The flexible package lithium ion battery hem structure of claim 1, wherein the number of windings of the cylindrical seal edge (123) is 1-2.

3. The soft pack lithium ion battery hem structure of claim 2, characterized in that the cylindrical seal edge (123) is wound 2 turns, comprising a first winding layer (1231) and a second winding layer (1232), the first winding layer (1231) being located at the inner ring of the cylindrical seal edge (123).

4. A pouch lithium ion battery hem structure as claimed in claim 3, characterized in that the diameter of the first winding layer (1231) is between 0.5 and 2.5 mm.

5. The pouch lithium ion battery hem structure of claim 4, wherein the diameter of the second winding layer (1232) is between 0.7 and 3mm.

6. The flexible lithium ion battery flanging structure according to any one of claims 1 to 5, wherein the battery body (100) has upper and lower planes, and the cylindrical seal edge (123) is not more than the upper and lower planes of the battery body (100) in the height direction.

7. The pouch lithium ion battery hemming structure of claim 6 wherein the battery body (100) has a thickness of 1 to 3mm.

8. The flexible lithium ion battery flanging structure according to any one of claims 1-5, wherein the packaging film is an aluminum plastic film.

9. The pouch lithium-ion battery hem structure of any of claims 1-5, wherein the adhesive layer (130) is glue.

10. The pouch lithium ion battery hem structure of claim 5, wherein the cylindrical seal edge (123) has a width of between 0.7 and 3mm and the same diameter as the second wound layer (1232).