CN217589379U

CN217589379U - Laminate polymer battery structure

Info

Publication number: CN217589379U
Application number: CN202221508792.XU
Authority: CN
Inventors: 李峥; 冯玉川; 覃青波; 李清晖; 王明辉; 何泓材
Original assignee: Yichun Qingtao Energy Technology Co ltd
Current assignee: Yichun Qingtao Energy Technology Co ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-10-14
Anticipated expiration: 2032-06-15

Abstract

The utility model relates to a laminate polymer battery production technical field discloses a laminate polymer battery structure. The soft package battery structure comprises a soft package film and a battery cell, wherein the soft package film comprises a battery cell accommodating cavity and an air bag, and the battery cell accommodating cavity is used for accommodating the battery cell; the air bag is arranged on one side of the battery cell accommodating cavity and comprises a first side edge adjacent to the battery cell accommodating cavity and a top surface parallel to the plane where the soft packaging film is located, an included angle alpha between the first side edge and the top surface is an obtuse angle, and the electrolyte can flow into the battery cell accommodating cavity from the first side edge of the air bag so as to infiltrate the battery cell. Contained angle alpha makes the flow of electrolyte more smooth and easy for obtuse setting up, and then promotes electrolyte to flow into electric core from the air pocket and hold the intracavity, reduces remaining of electrolyte in the air pocket, reduces the waste of electrolyte, promotes the infiltration effect of electric core, promotes laminate polymer battery's notes liquid effect and encapsulation effect.

Description

Laminate polymer battery structure

Technical Field

The utility model relates to a laminate polymer battery production field, in particular to laminate polymer battery structure.

Background

The production process of the soft package battery mainly comprises the working procedures of homogenizing, coating, rolling, punching, laminating, injecting liquid, packaging, forming and the like. In the liquid injection process, it is usually necessary to inject the electrolyte into the gas bag, so that the electrolyte flows into the cell accommodating cavity from the gas bag to infiltrate the cell.

However, the air bag structure in the prior art has difficulty in promoting the flow of the electrolyte from the air bag into the cell accommodating chamber, resulting in a part of the electrolyte remaining in the air bag. On one hand, electrolyte waste is caused, the cell infiltration effect is poor, and the content of the electrolyte in the cell is lower than the specified content; on the other hand, the electrolyte overflows in the subsequent process of cutting out the air bag, pollutes the packaging mold and the aluminum-plastic film, and then causes the soft package battery to be packaged badly, and the serious can lead to the failure of packaging equipment.

Therefore, a pouch battery structure is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a laminate polymer battery structure reduces remaining of electrolyte in the air pocket, improves laminate polymer battery's notes liquid effect and encapsulation effect.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a laminate polymer battery structure, includes soft diolame and electric core, soft diolame includes:

the battery cell accommodating cavity is used for accommodating the battery cell;

the air pocket, the air pocket sets up electricity core holds chamber one side, the air pocket include with electricity core holds the chamber adjacent first side and with the parallel top surface in flexible packaging film place plane, first side with the contained angle alpha of top surface is the obtuse angle, and electrolyte can be followed the air pocket first side flows into thereby the chamber is held to electricity core holds the chamber and soaks the electricity core.

Preferably, the soft capsule comprises a first soft capsule and a second soft capsule which are connected along a folding line and are symmetrically identical, and the first soft capsule and the second soft capsule are both convexly provided with:

the two battery cell accommodating parts are symmetrically matched to form the battery cell accommodating cavity;

the two air bag parts are symmetrically matched to form the air bag.

Preferably, one end of the air bag close to the battery cell accommodating cavity is symmetrically spliced into a V shape by the two first side edges.

Preferably, the included angle α is in the range of 145 ° to 175 °.

Preferably, the length of the air bag is smaller than the length of the battery cell accommodating cavity.

Preferably, the air bag further comprises a second side edge and a fourth side edge, and the second side edge and the fourth side edge are respectively connected to two ends of the top surface and are both connected to the first side edge.

Preferably, the air bag further comprises a third side edge, the third side edge is connected to one side of the top surface far away from the first side edge, and two ends of the third side edge are respectively connected with the second side edge and the fourth side edge.

Preferably, the included angle between the third side edge and the top surface is 90 degrees; and/or the included angles between the second side edge and the top surface and between the fourth side edge and the top surface are both 90 degrees.

Preferably, the soft packaging film is provided with a liquid injection edge, and the liquid injection edge is positioned on one side, away from the first side edge, of the air bag.

Preferably, the soft coating film is made of an aluminum plastic film material.

The utility model has the advantages that:

adopt the utility model discloses a during laminate polymer battery structure, the utility model discloses an air pocket includes holds the first side that the chamber is adjacent and the top surface parallel with laminate polymer place plane with electric core, and the first side is the obtuse angle with the contained angle alpha of top surface. Obtuse setting makes the flow of electrolyte more smooth and easy, and then promotes electrolyte to flow into electric core from the air pocket and hold the intracavity, reduces remaining of electrolyte in the air pocket, reduces the waste of electrolyte, promotes the infiltration effect of electric core, promotes laminate polymer battery's notes liquid effect and encapsulation effect.

Drawings

Fig. 1 is a front view of a pouch battery structure according to an embodiment of the present invention;

fig. 2 is a front view of a soft-package battery structure provided by an embodiment of the present invention after being folded along a folding line;

fig. 3 is a side view of a soft-package battery structure provided by an embodiment of the present invention after being folded along a folding line;

fig. 4 is an enlarged view of the area a in fig. 3.

In the figure:

1. soft coating; 11. a first soft capsule; 12. a second soft capsule;

2. a battery cell accommodating cavity; 21. a cell housing section;

3. an air bag; 31. an air bag part; 311. a first side edge; 312. a second side edge; 313. a third side; 314. a fourth side; 315. a top surface;

4. a top seal area; 5. a side sealing area; 6. a first edge sealing area; 7. a second edge sealing area; 8. injecting liquid while; 9. folding lines are aligned; 10. and (5) battery cores.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a laminate polymer battery structure, and it can be used to laminate polymer battery production field.

As shown in fig. 1 and fig. 2, the pouch battery structure includes a soft packaging film 1 and a battery cell 10, and the soft packaging film 1 is used for packaging the battery cell 10. Simultaneously, this soft packet of membrane 1 includes first soft packet of membrane 11 and second soft packet of membrane 12, and this first soft packet of membrane 11 and second soft packet of membrane 12 are protruding to be equipped with electric core portion of holding 21 and air bag portion 31 all, and two electric core portions of holding 21 symmetry cooperations form electric core and hold chamber 2, and two air bag portion 31 symmetry cooperations form air pocket 3. As shown in fig. 2, the air bag 3 is disposed on one side of the cell accommodating cavity 2, the cell accommodating cavity 2 is used for accommodating a cell 10, the air bag 3 is used for injecting electrolyte, and the air bag 3 is further used for collecting gas generated in the formation process of the cell 10. After the soft packaging film 1 in fig. 1 is folded in half along the folding line 9, as shown in fig. 2 and fig. 3, the cell accommodating portion 21 of the first soft packaging film 11 and the cell accommodating portion 21 of the second soft packaging film 12 can be aligned and matched to form a complete cell accommodating cavity 2. Similarly, after the soft packaging film 1 is folded in two along the folding line 9, the air pocket portion 31 of the first soft packaging film 11 and the air pocket portion 31 of the second soft packaging film 12 can be aligned and matched to form the complete air pocket 3. Compared with the case that the cell accommodating cavity 2 and the air bag 3 are arranged on the first soft capsule 11 in a protruding mode, the battery pack can accommodate a thicker cell 10 and collect more gas, and meanwhile the situation that the soft capsule 1 is broken due to too large deformation can be avoided. Furthermore, the length of the air bag 3 is smaller than the length of the battery cell accommodating cavity 2, so that the electrolyte of the air bag 3 can flow into the battery cell accommodating cavity 2 as far as possible, and the flow direction of the electrolyte is prevented from exceeding the range of the battery cell accommodating cavity 2.

Preferably, as shown in fig. 2, the airbag 3 includes a first side 311, a second side 312, a third side 313, a fourth side 314, and a top surface 315. The top surface 315 is parallel to the plane of the soft packaging film 1, the first side 311 is adjacent to the cell accommodating cavity 2, the second side 312 and the fourth side 314 are respectively connected to two ends of the top surface 315 and are both connected to the first side 311, the third side 313 is connected to one side of the top surface 315 away from the first side 311, and two ends of the third side 313 are respectively connected to the second side 312 and the fourth side 314.

Preferably, as shown in fig. 2, the soft packaging film 1 is provided with a top sealing area 4 along the fourth side 314, a side sealing area 5 is provided along the electric core accommodating cavity 2 away from the air bag 3, a first sealing area 6 is provided along the electric core accommodating cavity 2 away from the air bag 3, a second sealing area 7 is provided between the air bag 3 and the electric core accommodating cavity 2, and a liquid injection edge 8 is provided along the air bag 3 away from the first side 311. After the battery cell 10 is placed into the battery cell accommodating cavity 2, the top sealing area 4 and the side sealing area 5 can be packaged. After the top sealing area 4 and the side sealing area 5 are packaged, the interior of the soft package battery structure is communicated with the atmosphere only through the liquid injection edge 8. At this time, the electrolyte can be injected into the gas pocket 3 through the injection edge 8, and the electrolyte flows into the cell accommodating cavity 2 from the gas pocket 3 to soak the cell 10.

Further, as shown in fig. 3 and 4, in the present embodiment, the included angle α between the first side 311 of the airbag 3 and the top surface 315 is an obtuse angle, and preferably ranges from 145 ° to 175 °. In the prior art, an included angle α between the first side 311 and the top surface 315 is a right angle, and compared with the prior art, the obtuse angle α of the embodiment is set such that one end of the air bag 3 close to the electric core accommodating cavity 2 is symmetrically spliced by the two first sides 311 to form a V shape, which can further promote the electrolyte to flow into the electric core accommodating cavity 2 from the air bag 3, on one hand, the electrolyte residue in the air bag 3 can be reduced, and the electrolyte waste can be reduced; on the other hand, the electrolyte can fully infiltrate the battery cell 10, and the liquid injection effect of the soft package battery is improved. It should be noted that, in other embodiments, the included angle α between the first side 311 of the gas bag 3 and the top surface 315 may also be different from 145 ° to 175 °, for example, the included angle α may also be 120 ° to 175 °, as long as the electrolyte can be promoted to flow from the gas bag 3 into the cell accommodating cavity 2, and is selected according to the needs, and is not limited herein.

Preferably, the included angles between the second side 312, the third side 313 and the fourth side 314 and the top surface 315 are all 90 °, which can effectively increase the volume of the airbag 3 and compensate the volume reduction of the airbag 3 caused by the obtuse angle α between the first side 311 and the top surface 315.

Preferably, the first side 311, the second side 312, the third side 313 and the fourth side 314 are respectively connected with the top surface 315 smoothly, which can promote the electrolyte to flow into the cell accommodating cavity 2 from the gas bag 3, reduce the residual electrolyte in the gas bag 3, and thus reduce the waste of the electrolyte.

Preferably, after the liquid injection is completed, as shown in fig. 2, the first sealing edge region 6 provided in this embodiment is sealed, and after the first sealing edge region 6 is sealed, the inside of the soft capsule 1 is in a completely sealed state. At this time, the pouch battery structure may be formed by suspending and standing the pouch battery structure for a certain period of time with the gas bag 3 facing upward. The air bag part 31 of the first soft capsule 11 and the air bag part 31 of the second soft capsule 12 can be aligned and matched to form a complete air bag 3, and compared with the case that the battery cell accommodating cavity 2 and the air bag 3 are only arranged on the first soft capsule 11 in a protruding mode, the air bag 3 of the embodiment has a larger volume, can store more formed gas, and avoids the situation that the air bag 3 is broken due to too much gas.

Preferably, after the formation of the battery cell 10 is completed, the air bag 3 is punctured, and the interior of the soft envelope 1 is evacuated. After the vacuum pumping is finished, the gas bag 3 is cut out, and the edge sealing is performed in the second edge sealing area 7 arranged in the embodiment, so that the manufacturing of the soft package battery is finished. In this embodiment, the contained angle alpha of first side 311 and top surface 315 of air pocket 3 is the obtuse angle, can reduce remaining of electrolyte in the air pocket 3 to reduce and cut out the overflow of 3 in-process electrolytes of air pocket, reduce the pollution of encapsulation mould and laminate film 1, reduce laminate polymer battery encapsulation harmfully and the condition of encapsulation equipment trouble, reduce economic loss.

Preferably, the soft coating film 1 is made of an aluminum plastic film, generally blows air firstly under the condition of potential safety hazards, or cracks from a sealing position to release energy, so that the soft coating film is not easy to explode and has good safety.

Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and for those skilled in the art, there are variations on the specific embodiments and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a laminate polymer battery structure which characterized in that, includes soft capsule (1) and electric core (10), soft capsule (1) includes:

the battery cell accommodating cavity (2), the battery cell accommodating cavity (2) is used for accommodating the battery cell (10);

air pocket (3), air pocket (3) set up electric core holds chamber (2) one side, air pocket (3) include with electric core holds first side (311) that chamber (2) are adjacent and with top surface (315) that soft capsule (1) place plane is parallel, first side (311) with the contained angle alpha of top surface (315) is the obtuse angle, and electrolyte can be followed first side (311) of air pocket (3) flow in electric core holds chamber (2) thereby soak electric core (10).

2. The soft package battery structure according to claim 1, wherein the soft envelope (1) comprises a first soft envelope (11) and a second soft envelope (12) which are symmetrically identical and connected along a folding line (9), and the first soft envelope (11) and the second soft envelope (12) are both provided with a convex part:

the two battery cell accommodating parts (21) are symmetrically matched to form the battery cell accommodating cavity (2);

the air bag parts (31) are symmetrically matched with each other to form the air bag (3).

3. The laminate battery structure according to claim 2, characterized in that one end of the gas bag (3) close to the cell accommodating cavity (2) is symmetrically spliced into a V shape by the two first side edges (311).

4. The pouch cell structure according to claim 1, wherein the included angle α ranges from 145 ° to 175 °.

5. The pouch cell structure according to claim 1, characterized in that the length of the gas pocket (3) is smaller than the length of the cell accommodating cavity (2).

6. The pouch cell structure according to claim 1, wherein the gas bag (3) further comprises a second side (312) and a fourth side (314), the second side (312) and the fourth side (314) are respectively connected to both ends of the top surface (315) and are both connected to the first side (311).

7. The pouch cell structure according to claim 6, wherein the gas bag (3) further comprises a third side (313), the third side (313) is connected to the top surface (315) at a side away from the first side (311), and both ends of the third side (313) are respectively connected to the second side (312) and the fourth side (314).

8. The pouch cell structure according to claim 7, wherein the third side edge (313) is at an angle of 90 ° to the top surface (315); and/or

The included angle between the second side edge (312) and the top surface (315) and the included angle between the fourth side edge (314) and the top surface (315) are both 90 degrees.

9. The laminate battery structure according to claim 1, wherein the soft envelope (1) is provided with a liquid injection edge (8), and the liquid injection edge (8) is located on the side of the gas bag (3) far away from the first side edge (311).

10. The pouch cell structure according to any one of claims 1-9, characterized in that the soft casing (1) is made of aluminum plastic film.