CN221747353U

CN221747353U - Mylar film, battery top cover and battery

Info

Publication number: CN221747353U
Application number: CN202323442050.9U
Authority: CN
Inventors: 姚卓政
Original assignee: Fuyang Haina Technology Co ltd
Current assignee: Fuyang Haina Technology Co ltd
Priority date: 2023-12-18
Filing date: 2023-12-18
Publication date: 2024-09-20
Anticipated expiration: 2033-12-18

Abstract

The utility model belongs to the technical field of battery processing, and discloses a mylar film, a battery top cover and a battery, wherein the mylar film comprises a main body part and a plurality of connecting parts which are arranged at the top of the main body part at intervals and extend reversely to the bottom far away from the main body part, the main body part can form a coating space for coating a battery core, and the coating space is in a groove shape with an opening at the top; the connecting portion can be welded with a top cover gasket arranged at the bottom of the battery top cover. The top cover gasket is provided with a limiting groove for inserting the connecting part. The mylar film can reduce the risk of the mylar film extending into the welding area of the battery top cover and the main shell of the battery, so that the possibility of welding points is reduced.

Description

Mylar film, battery top cover and battery

Technical Field

The utility model relates to the technical field of battery processing, in particular to a mylar film, a battery top cover and a battery.

Background

At present, in the square aluminum shell battery production process, in order to play a role in protecting and insulating a battery cell, the battery cell needs to be wrapped by a mylar film and then is put into a shell, and the mylar film is connected with a PP plastic gasket below a battery top cover through thermal fusion welding so as to achieve the functions of fixing and wrapping the battery cell. In order to improve the volume specific capacity of the battery, the plastic gasket is usually designed to be narrower, the distance between the mylar film and the battery top cover is very short, and usually between 1 mm and 3mm, the mylar film is slightly inclined, so that the mylar film stretches into the space between the battery top cover and the main shell of the battery, and the battery top cover is welded with a burst point, which cannot be reworked and can only be scrapped, even if reworked, the battery processing efficiency is reduced.

Disclosure of utility model

The utility model aims to provide a mylar film, which can reduce the risk of welding and explosion points of a battery top cover caused by deflection of the mylar film.

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

a mylar film comprising:

The main body part can form a coating space for coating the battery cell, and the coating space is in a groove shape with an opening at the top;

The plurality of connecting portions are arranged at intervals at the top of the main body portion and extend in a direction away from the bottom of the main body portion for welding with a top cover gasket arranged at the bottom of the battery top cover.

Preferably, the connecting portion is formed integrally with the main body portion in an elongated sheet shape having the same thickness as the main body portion.

Preferably, the connection portion is provided in a T shape or a rectangular shape.

Preferably, the height of the connecting part protruding from the main body part is 5-10mm.

The utility model also aims to provide a battery top cover matched with the mylar, the battery top cover comprises a top cover sheet and a top cover gasket arranged at the bottom of the top cover sheet, and a limiting groove with a downward opening for inserting the connecting part is arranged on the side wall of the top cover gasket at a position corresponding to the connecting part.

Preferably, the side wall of the top cover gasket is provided with a convex upper stop part and a convex lower stop part, the lower stop part is positioned below the upper stop part and is provided with a notch, the lower stop part, the upper stop part and the side wall of the top cover gasket jointly form the limit groove, and the notch is the opening of the limit groove.

Preferably, the width of the notch is 2-3mm greater than the width of the connecting portion.

Preferably, the distance between the upper stopper portion and the lower stopper portion is the same as the height by which the connecting portion protrudes from the main body portion.

Preferably, the side walls of the top cover gaskets facing the mylar film are provided with the upper stop parts.

The utility model also provides a battery, which comprises a battery core, a main shell, any mylar film and any battery top cover, wherein the battery core is arranged in the main shell, the battery top cover is welded with the main shell, the mylar film is wrapped outside the battery core, and the connecting part in the mylar film is inserted into a limit groove of the battery top cover and welded with the battery top cover.

The utility model has the beneficial effects that: the raised connecting part is arranged on the main body part, so that the area which is neither welded nor protected on the original mylar film is removed, and the risk of top cover welding points caused by the fact that the mylar film stretches into the welding area between the battery top cover and the main shell is reduced. And the limiting groove arranged on the top cover gasket of the battery top cover can limit the mylar film, so that the possibility that the mylar film enters the welding area of the battery top cover and the main shell is further reduced. The battery utilizing the mylar film and the battery top cover improves the processing efficiency of the whole battery due to the unique design of the connecting part and the limiting groove.

Drawings

FIG. 1 is a diagram of the connection of a mylar film to a top cover of a battery in an embodiment of the utility model;

FIG. 2 is a schematic illustration of the structure of a mylar film in an embodiment of the utility model;

Fig. 3 is a schematic view of the structure of a battery top cover in an embodiment of the present utility model.

In the figure:

1. A main body portion; 2. a connection part; 3. a top cover sheet; 4. a top cover gasket; 5. an upper stopper; 6. a lower stop portion; 7. a notch; 8. and a limit groove.

Detailed Description

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

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" 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 will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc., azimuth or positional relationship are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of operations, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Referring to fig. 1 and 2, one embodiment of the present utility model provides a mylar film, which includes a main body 1 and a connection part 2, wherein the main body 1 can be folded to form a covering space for covering a battery cell, and the covering space is configured according to the shape of a main housing of the battery, and may be configured as a rectangular groove with an open top or a cylindrical groove with an open top, which is not particularly limited herein. After the battery cell is placed in the cladding space, the height of the battery cell is consistent with the height of the top of the cladding space, so that the situation of electric leakage, short circuit and the like between the battery cell and the main shell of the battery can be effectively prevented, a plurality of connecting parts 2 are arranged at intervals at one end of the opening of the cladding space, namely the top of the main body part 1 and extend towards the direction away from the bottom of the main body part 1, namely the connecting parts 2 are arranged in the main body part 1 in a protruding mode, and are used for welding a top cover gasket 4 arranged at the bottom of a top cover of the battery.

The top of the mylar film is in an overall concave-convex shape due to the existence of the connecting part 2, and the convex connecting part 2 is arranged only at the place where the mylar film is connected with the top cover gasket 4, so that the area which is neither connected nor protected on the mylar film is removed, the risk of welding and explosion of the top cover of the battery caused by the fact that the mylar film stretches into the welding area of the top cover of the battery is reduced, and the manufacturing cost is reduced due to the reduction of the consumption.

In another embodiment of the present utility model, a battery top cover for use with the mylar film is further provided, and referring to fig. 1 and 3, the battery top cover includes a top cover sheet 3 and a top cover gasket 4 disposed at the bottom of the top cover sheet 3, where the top cover sheet 3 is generally in the prior art, and may be disposed according to actual requirements in the battery processing process, for example, includes an explosion-proof valve, etc., and the top cover gasket 4 is generally made of pp plastic and includes bosses disposed at two ends and in a middle position, respectively. In order to match the connection portion 2, a limit groove 8 for inserting the connection portion 2 is provided on the side wall of the top cover gasket 4 corresponding to the connection portion 2, specifically, the limit groove 8 is provided on the boss side wall. The limit groove 8 has an opening facing the connecting part 2, i.e. facing downwards, and the connecting part 2 can be inserted into the limit groove 8 and connected to the bottom of the limit groove 8 by means of welding.

Through the setting of spacing groove 8, can move the thermal melting point of mylar film and top cap gasket 4 to the bottom of spacing groove 8 to the position of restriction mylar film reduces the possibility that connecting portion 2 of mylar film stretches into battery top cap welded area.

Optionally, the connecting portion 2 is in an extension sheet shape consistent with the thickness of the main body portion 1, and the connecting portion 2 and the main body portion 1 can be integrally formed during processing, so as to reduce processing difficulty.

It will be appreciated that the connecting portions 2 on the same body portion 1 may be provided in the same shape or in different shapes. In some embodiments, the connecting portions 2 are rectangular, and the height of the connecting portions 2 protruding from the main body 1 is between 5mm and 10mm according to the design heights of different battery cells.

In other embodiments, the connecting portion 2 may be configured in other shapes to increase the connection area with the top cover gasket 4 and improve the connection stability between the mylar film and the battery top cover. For example, the connection part 2 may be provided with a T-shape, and correspondingly, the limit groove 8 on the top cover gasket 4 is also provided with a T-shape. Specifically, the limiting groove 8 is formed by matching an upper stop part 5 and a lower stop part 6 which are arranged on the side wall of the top cover gasket 4 in a protruding manner with the side wall of the top cover gasket 4, wherein two ends of the upper stop part 5 are respectively connected with two opposite sides of the top cover gasket 4, the lower stop part 6 is arranged below the upper stop part 5 in a parallel manner at intervals and is provided with a notch 7, the notch 7 is used as an opening of the limiting groove 8, and a space between the upper stop part 5 and the lower stop part 6 is a space for placing the connecting part 2. The width of the notch 7 is slightly larger than the width of the connecting part 2 on the side connected with the main body part 1, for example, the width of the notch 7 is 2-3mm larger than the width of the connecting part 2, so that the connecting part 2 is placed in the limit groove 8. As for the distance between the upper stopper 5 and the lower stopper 6, it is consistent with the height of the connection part 2 protruding from the main body part 1.

It can be understood that, since the relative positional relationship between the connection portions 2 is fixed, the positioning effect on all the connection portions 2 can be achieved by providing the limiting grooves 8 less than the number of the connection portions 2, i.e., the number of the limiting grooves 8 may be the same as the number of the connection portions 2 or less than the number of the connection portions 2.

According to the number of welding points between the mylar film and the top cover gasket 4, taking the rectangular groove as an example of the cladding space, the connecting part 2 is provided with 8, wherein 3 long sides at the top of the rectangular groove are respectively provided with two ends at the long sides and the middle position of the long sides, one of the two short sides at the top of the rectangular groove is respectively provided with the middle position of the short side of the rectangular groove. At this time, according to the distribution condition of the connecting portion 2, the boss in the middle of the top cover gasket 4 corresponds to the side wall of the long side of the rectangular groove and is provided with a limit groove 8 so as to correspond to the connecting portion 2 arranged at the middle position of the long side of the rectangular groove, the boss at the two ends of the top cover gasket 4 corresponds to the side wall of the short side of the rectangular groove and is also provided with a limit groove 8 so as to correspond to the connecting portion 2 arranged at the short side position of the rectangular groove, and meanwhile, the upper stop portion 5 positioned at the protruding portion at the two ends of the top cover plate 3 extends to the end surfaces of the two ends of the protrusion and then bends to extend along the long side direction of the top of the rectangular groove so as to limit the other connecting portion 2 arranged at the long side of the rectangular groove. In summary, the top cover gasket 4 is provided with an upper stop 5 on the side wall facing the mylar film.

In some embodiments of the present utility model, a battery is further provided, including the above mylar film, a battery top cover, a battery core, and a main casing, where the main casing is in a shape of a groove with an open top, the battery top cover can close the opening of the main casing, the battery core is disposed inside the main casing, the mylar film is wrapped outside the battery core and is located inside the main casing, and a connection part 2 in the mylar film is inserted into a limit groove 8 provided in a top cover gasket 4 of the battery top cover and is welded with the battery top cover.

When the mylar film is assembled with the battery top cover, the connecting part 2 is placed in the limiting groove 8, and the hot melting head carries out hot melting on the connecting part 2 and the bottom of the limiting groove 8, so that the whole mylar film is fixed, and the insulation and protection effects are achieved. During assembly, the upper stop part 5 can play a limiting role on the upward movement of the connecting part 2, and the lower stop part 6 can play a limiting role on two sides of the connecting part 2, so that the relative position of the whole mylar and the battery top cover can be controlled, and the mylar film is prevented from extending into a welding area of the battery top cover to cause a frying point.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

A mylar film, comprising:

The main body part (1), the main body part (1) can be folded to form a coating space for coating the battery cell, and the coating space is in a groove shape with an open top;

The plurality of connecting portions (2) are arranged at intervals at the top of the main body portion (1) and extend in a direction away from the bottom of the main body portion (1) for welding with a top cover gasket (4) arranged at the bottom of the battery top cover.
2. A mylar film according to claim 1, wherein the connection part (2) is an elongated sheet of the same thickness as the main body part (1) and is integrally formed with the main body part (1).
3. A mylar film according to claim 1, wherein the connection (2) is arranged in a T-shape or a rectangular shape.
4. A mylar film according to claim 1, wherein the height of the connection portion (2) protruding from the main body portion (1) is 5-10mm.
5. The battery top cover is characterized by being capable of being welded with any one of the mylar films according to claims 1-4, and comprises a top cover sheet (3) and a top cover gasket (4) arranged at the bottom of the top cover sheet (3), wherein a limiting groove (8) with an opening facing downwards and used for allowing the connecting part (2) to be inserted is formed in the side wall of the top cover gasket (4) corresponding to the connecting part (2).
6. The battery top cover according to claim 5, characterized in that a protruding upper stop portion (5) and a protruding lower stop portion (6) are arranged on the side wall of the top cover gasket (4), the lower stop portion (6) is located below the upper stop portion (5) and is provided with a notch (7) thereon, the side walls of the lower stop portion (6), the upper stop portion (5) and the top cover gasket (4) jointly form the limit groove (8), and the notch (7) is the opening of the limit groove (8).
7. The battery top cover according to claim 6, characterized in that the width of the notch (7) is 2-3mm larger than the width of the connecting portion (2).
8. The battery top cover according to claim 6, characterized in that the distance between the upper stop portion (5) and the lower stop portion (6) is the same as the height by which the connecting portion (2) protrudes from the main body portion (1).
9. Battery top cover according to claim 6, characterized in that the top cover gasket (4) is provided with the upper stop (5) on the side wall facing the mylar film.
10. The battery is characterized by comprising a battery core, a main shell, the mylar film according to any one of claims 1-4 and the battery top cover according to any one of claims 5-9, wherein the battery core is arranged inside the main shell, the battery top cover is connected with the main shell in a welded mode, the mylar film is wrapped outside the battery core, and the connecting part (2) in the mylar film is inserted into the limiting groove (8) of the battery top cover and is connected with the battery top cover in a welded mode.