CN217426913U

CN217426913U - Aluminum-plastic film packaging structure and soft package lithium ion battery

Info

Publication number: CN217426913U
Application number: CN202220462285.0U
Authority: CN
Inventors: 黄静; 韩兵; 凌雪强
Original assignee: Chongqing Zijian Electronic Co ltd
Current assignee: Chongqing Zijian Electronic Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-09-13
Anticipated expiration: 2032-03-03

Abstract

The utility model provides an aluminum-plastic film packaging structure and soft packet of lithium ion battery belongs to new forms of energy technical field. The utility model discloses an aluminum-plastic film, aluminum-plastic film both sides are provided with the first die cavity and the second die cavity that the width is the same, first die cavity with be provided with the clearance between the second die cavity, the clearance is the bridge region, the bottom surface of first die cavity with the bottom surface of second die cavity all is provided with inclination, just first die cavity inner chamber length equals second die cavity inner chamber length with bridge region length sum, the aluminum-plastic film is followed first die cavity with bridge region face after the wiring fifty percent discount, first die cavity second die cavity with bridge region forms the cavity that thickness is unanimous. The utility model discloses effectively solve soft package lithium ion battery and appear the bottom clearance, cause the high superelevation problem of soft package lithium ion battery, improve soft package lithium ion battery energy density, increase soft package lithium ion battery security, improve soft package lithium ion battery production efficiency.

Description

Aluminum-plastic film packaging structure and soft package lithium ion battery

Technical Field

The utility model relates to a new forms of energy technical field, concretely relates to plastic-aluminum membrane packaging structure and soft packet of lithium ion battery.

Background

At present, the soft package lithium ion battery mostly adopts a double-pit aluminum-plastic film structure, an arc-shaped folding trace appears at the position of a folding line of the aluminum-plastic film, and after a roll core is placed, a gap appears at the bottom of the soft package lithium ion battery, so that the space waste in the height direction of the battery is caused, and the energy density of the soft package lithium ion battery is reduced; meanwhile, the situation that the height of the battery is ultrahigh can also occur, and the primary yield of the soft package lithium ion battery is reduced. In order to solve the problem of ultrahigh height of the battery, chamfering is added on site, and the protruding arc-shaped folding marks are folded and flattened. Although the problem that the soft package lithium ion battery is ultrahigh in height is solved, the processing procedure of the soft package lithium ion battery is added, and the production efficiency of the soft package lithium ion battery is reduced.

The two pit depths of two pit plastic-aluminum membrane structures adopt one dark one shallowly more, because the shallow pit has taken up partly core thickness of rolling up for the degree of depth size in deep pit diminishes, and the side banding width that leads to subsequent handling is narrower, has increased the risk that soft package lithium ion battery revealed, leads to soft package lithium ion battery security to reduce.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an aluminum-plastic film packaging structure and soft packet of lithium ion battery. The problems of low energy density, low production efficiency and safety of the soft package lithium ion battery are solved.

In order to achieve the above purpose, the utility model discloses a set up like this: the utility model provides an aluminum-plastic film packaging structure includes the aluminum-plastic film, the aluminum-plastic film both sides are provided with the first die cavity and the second die cavity that the width is the same, first die cavity with be provided with the clearance between the second die cavity, the clearance is the bridge region, the bottom surface of first die cavity with the bottom surface of second die cavity all is provided with inclination, just first die cavity inner chamber length equals second die cavity inner chamber length with bridge region length sum, the aluminum-plastic film is followed first die cavity with bridge region face after the wiring fifty percent discount first die cavity, the second die cavity with bridge region forms the cavity that thickness is unanimous. The design can effectively solve the problems of low energy density, low production efficiency and safety of the soft package lithium ion battery.

In order to further improve the safety and the production efficiency of the soft package lithium ion battery, the pit depth A of one end, close to the gap bridge area, of the first mold cavity is larger than the pit depth B of one end, far away from the gap bridge area, of the first mold cavity.

In order to further improve the safety and the production efficiency of the soft package lithium ion battery, the pit depth C of one end, close to the bridging area, of the second die cavity is smaller than the pit depth D of one end, far away from the bridging area, of the second die cavity, and the size of the pit depth C is zero.

In order to further improve the energy density of the soft package lithium ion battery, the size of the pit depth B from the adjacent side line of the aluminum-plastic film is the same as the size of the pit depth D from the adjacent side line of the aluminum-plastic film.

In order to further improve the safety of the soft package lithium ion battery, after the aluminum plastic film is folded in half, the bottom surface of the first mold cavity is parallel to the bottom surface of the second mold cavity.

In order to further improve the energy density of the soft package lithium ion battery, the pit depth A is equal to the sum of the pit depth B and the pit depth D.

In order to further improve the safety of the soft package lithium ion battery, the edges of the first mold cavity (1) and the second mold cavity (2) are provided with rounded corners.

Additionally, the utility model provides a soft packet of lithium ion battery, including rolling up core, anodal ear, negative pole ear and the aforesaid plastic-aluminum membrane packaging structure, it is located to roll up the core the cavity, it is provided with to roll up the core upper end anodal ear with the negative pole ear, anodal ear with the upper end of negative pole ear all passes plastic-aluminum membrane to external world.

Advantageous effects

The utility model discloses an adopt plastic-aluminum membrane packaging structure, the plastic-aluminum membrane is followed first die cavity with cross the line fifty percent discount that faces of bridge district, the circular-arc folding trace that the plastic-aluminum membrane appears to broken line position becomes the bottom clearance appears in the edge of cavity, the soft package lithium ion battery of solution, causes the problem of the high superelevation of soft package lithium ion battery, has improved soft package lithium ion battery energy density. And the size of the pit depth C is zero, so that the depth of the first die cavity is increased to some extent compared with the prior art, conditions are provided for widening the width of the side sealing edge of the soft package lithium ion battery in the subsequent process, the safety of the soft package lithium ion battery is effectively improved, and meanwhile, the production efficiency of the soft package lithium ion battery is also improved.

Drawings

Fig. 1 is a schematic front view of an aluminum-plastic film package structure of the present invention;

FIG. 2 is a schematic side view of the aluminum-plastic film package structure of the present invention;

fig. 3 is a schematic front view of a soft package lithium ion battery of the present invention;

fig. 4 is a schematic side view of the soft-packed lithium ion battery of the present invention.

Detailed Description

In order to make the technical solutions, advantages and objects of the present invention clearer, the drawings of the embodiments of the present invention will be combined below to clearly and completely describe the technical solutions of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the present application.

The present invention will be further explained with reference to the drawings and examples.

Example 1

As shown in fig. 1 and 2, the aluminum-plastic film structure in this embodiment includes an aluminum-plastic film, a first mold cavity 1 and a second mold cavity 2 having the same width are disposed on two sides of the aluminum-plastic film, and the first mold cavity 1 and the second mold cavity 2 are formed by shell punching using a special inclined double-pit mold, so that the bottom surface of the first mold cavity 1 and the bottom surface of the second mold cavity 2 are both provided with an inclined angle.

A gap is arranged between the first die cavity 1 and the second die cavity 2, the gap is a gap bridge area 3, and the length of the inner cavity of the first die cavity 1 is equal to the sum of the length of the inner cavity of the second die cavity 2 and the length of the gap bridge area 3. When the thickness of the winding core is less than 3.2mm, the size of the gap bridge area 3 along the length direction of the inner cavity of the first die cavity 1 is 1.5 mm; when the thickness of the winding core is more than 3.2mm and less than 3.9mm, the value of the size of the bridging area 3 along the length direction of the inner cavity of the first die cavity 1 is 1.6 mm; when the thickness of the winding core is larger than or equal to 3.9mm, the value of the size of the gap bridge area 3 along the length direction of the inner cavity of the first die cavity 1 is 1.7 mm.

First die cavity 1 with the edge of second die cavity 2 is provided with the radius angle, sets up the stress concentration that the radius angle can reduce the edge position, avoids the edges and corners to produce the damage when receiving external force effect down to take place deformation, improves the structural strength of plastic-aluminum membrane structure.

The pit depth A11 of the first mold cavity 1 near the end of the bridge region 3 is greater than the pit depth B12 of the first mold cavity 1 far from the end of the bridge region 3. The pit depth C21 of the second cavity 2 near the end of the bridge region 3 is smaller than the pit depth D22 of the second cavity 2 far from the end of the bridge region 3, and the size of the pit depth C21 is zero. The aluminum-plastic film is folded along the adjacent lines of the first die cavity 1 and the gap bridge area 3, arc-shaped folding marks appearing at the positions of the opposite folding lines of the aluminum-plastic film become the edges of the cavity, and the problem that the soft package lithium ion battery is ultrahigh in height due to the bottom gap is solved. Make simultaneously the degree of depth of first die cavity compares to increase to some extent before, widens for the side seal width of the soft packet of lithium ion battery of follow-up process and provides the condition, effectively increases soft packet of lithium ion battery's security, has improved soft packet of lithium ion battery's production efficiency simultaneously.

The distance between the pit depth B12 and the adjacent side line of the aluminum-plastic film is the same as the distance between the pit depth D22 and the adjacent side line of the aluminum-plastic film. After being folded in half, the first die cavity 1, the second die cavity 2 and the bridging area 3 form a cavity with consistent thickness.

As shown in fig. 4, after the aluminum-plastic film is folded in half, the bottom surface of the first cavity 1 and the bottom surface of the second cavity 2 are parallel. The pit depth a11 is equal to the sum of the pit depth B12 and the pit depth D22.

The inner part of the cavity is of a square structure and is matched with the winding core.

Example 2

As shown in fig. 3 and 4, the soft package lithium ion battery in this embodiment includes a roll core, a positive tab, a negative tab and an aluminum-plastic film, the roll core is located in the cavity, the upper end of the roll core is provided with the positive tab and the negative tab, and the upper ends of the positive tab and the negative tab both pass through the aluminum-plastic film to the outside.

The aluminum-plastic film is hot-pressed, so that the upper end and the left side of the roll core are sealed together, the edge of the soft package lithium ion battery is cut and folded after electrolyte injection, activation and secondary sealing, and the sealing edge is tightly attached to the soft package lithium ion battery main body through the hot-pressing process. Such design makes soft packet of lithium ion battery outward appearance more pleasing to the eye, and the hem is neat, regular, has still increased the effective seal width of soft packet of lithium ion battery main part side simultaneously, effectively reduces the risk of revealing of soft packet of lithium ion battery because of the narrow production of effective seal width.

To sum up, the utility model provides a pair of plastic-aluminum membrane packaging structure and soft packet of lithium ion battery effectively solves soft packet of lithium ion battery and appears the bottom clearance, causes the high superelevation problem of soft packet of lithium ion battery, has improved soft packet of lithium ion battery energy density, has increased soft packet of lithium ion battery security, has improved soft packet of lithium ion battery production efficiency, has popularization and application and worth.

Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or substituted by equivalents without departing from the spirit and scope of the technical solutions, which should be covered by the protection scope of the present invention.

Claims

1. The utility model provides an aluminum-plastic film packaging structure, includes the aluminum-plastic film, the aluminum-plastic film both sides are provided with the first die cavity (1) and second die cavity (2) that the width is the same, first die cavity (1) with be provided with the clearance between second die cavity (2), the clearance is bridge region (3), its characterized in that: the bottom surface of the first die cavity (1) and the bottom surface of the second die cavity (2) are provided with inclination angles, the length of an inner cavity of the first die cavity (1) is equal to the sum of the length of an inner cavity of the second die cavity (2) and the length of the bridging area (3), and the aluminum-plastic film forms a cavity with the same thickness along the first die cavity (1) and the bridging area (3) after the adjacent wires of the bridging area (3) are folded.

2. The aluminum plastic film packaging structure of claim 1, wherein: the pit depth A (11) of one end, close to the bridge crossing area (3), of the first mold cavity (1) is larger than the pit depth B (12) of one end, far away from the bridge crossing area (3), of the first mold cavity (1).

3. The aluminum-plastic film packaging structure of claim 2, wherein: the pit depth C (21) of one end, close to the bridge passing area (3), of the second die cavity (2) is smaller than the pit depth D (22) of one end, far away from the bridge passing area (3), of the second die cavity (2), and the size of the pit depth C (21) is zero.

4. The aluminum-plastic film packaging structure of claim 3, wherein: the size of the pit depth B (12) from the adjacent side line of the aluminum-plastic film is the same as the size of the pit depth D (22) from the adjacent side line of the aluminum-plastic film.

5. The aluminum-plastic film packaging structure of claim 4, wherein: after the aluminum-plastic film is folded in half, the bottom surface of the first mold cavity (1) is parallel to the bottom surface of the second mold cavity (2).

6. The aluminum-plastic film packaging structure of claim 5, wherein: the pit depth A (11) is equal to the sum of the pit depth B (12) and the pit depth D (22).

7. The aluminum-plastic film packaging structure of any one of claims 1, 2, 3, 4, 5 and 6, wherein: edges of the first die cavity (1) and the second die cavity (2) are provided with fillets.

8. The utility model provides a soft packet of lithium ion battery, includes roll core, anodal ear, negative pole ear, its characterized in that: the aluminum-plastic film packaging structure of any one of claims 1 to 7, wherein the winding core is located in the cavity, the positive tab and the negative tab are arranged at the upper end of the winding core, and the upper ends of the positive tab and the negative tab both penetrate through the aluminum-plastic film to the outside.