CN213660508U

CN213660508U - Battery Mylar packaging structure and electricity core

Info

Publication number: CN213660508U
Application number: CN202022723851.2U
Authority: CN
Inventors: 何波; 张万财
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-07-09
Anticipated expiration: 2030-11-23

Abstract

The utility model discloses a battery Mylar packaging structure and electric core, including the Mylar membrane of rectangle structure, including the 5 regions that set gradually at the Mylar membrane, 5 regions are positive one district, top district, back face district, bottom district and two positive districts respectively, wrap up the Mylar membrane at the surface of naked electric core, make the top district as to the electric core top, the bottom district as to the electric core bottom, the back district as to the electric core back, positive one district and two positive districts as to the electric core front, the Mylar membrane still includes that both sides side area wraps up on the lateral wall of naked electric core; the top area is provided with a positioning hole and an electrolyte channel which are communicated with the top cover, and the bottom area is provided with an electrolyte channel. The utility model can reduce the manufacturing process of the battery cell and reduce the cost; the safety and reliability of the battery cell can be ensured.

Description

Battery Mylar packaging structure and electricity core

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a battery Mylar packaging structure and electricity core.

Background

The Mylar film in the prior art does not have a package to the electric core side, and the side needs to paste the sticky tape of whole face, increases work step, and the side rubberizing causes the side sticky tape to wrinkle easily simultaneously, causes electric core harmfully, causes electric core manufacturing cost to increase, and manufacturing procedure increases simultaneously, causes bad proportion increase to electric core. And the existing Mylar film can not be effectively matched with the shell and the top cover, so that the package deviation is caused, and the safety and reliability of the battery cell are reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a battery Mylar packaging structure and a battery cell, which can reduce the manufacturing procedures of the battery cell and reduce the cost; the safety and reliability of the battery cell can be ensured.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a battery Mylar packaging structure comprises a Mylar film with a rectangular structure, wherein the Mylar film comprises 5 areas which are sequentially arranged, the 5 areas are a front area, a top area, a back area, a bottom area and a front area, the Mylar film is wrapped on the outer surface of a naked electric core, the top area is arranged at the top of the electric core, the bottom area is arranged at the bottom of the electric core, the back area is arranged at the back of the electric core, the front area and the front area are arranged at the front of the electric core, and the Mylar film further comprises side edge areas at two sides which are wrapped on the side wall of the naked electric core; the top area is provided with a positioning hole and an electrolyte channel which are communicated with the top cover, and the bottom area is provided with an electrolyte channel.

Furthermore, a lower boss positioning hole of the top cover positive pole column, a lower boss positioning hole of the negative pole column and a top cover liquid injection positioning hole are formed in the top area, so that the top cover and the Mylar film can be accurately positioned and matched; the top area is provided with an electrolyte through hole communicated with the top cover liquid injection hole, so that electrolyte can flow into the core of the battery core through the hole.

Furthermore, air holes are formed in the top area. When the battery generates gas in the use process, the gas is transmitted to the explosion-proof valve right above the battery through the air holes, and when the inside of the battery reaches a certain air pressure, the explosion-proof valve is opened to release the air, so that the explosion of the battery is avoided.

Furthermore, the air holes are formed in the middle of the high-temperature insulating layer by adopting a plurality of densely distributed small holes. The accuracy of gas conduction is improved.

Furthermore, the electrolyte through holes are array-type small round holes, so that the Mylar-wrapped roll core electrolyte and the Mylar external electrolyte are circulated mutually, and the balance of the internal external electrolyte of the bare cell is ensured.

Further, the sum of the widths of the side edge areas at the two sides of the mylar film is 5-15mm larger than the width of the bottom area. When the thickness is less than 5mm, edge folding difficulty can be caused, and incomplete overlapping can be caused to cause unsatisfactory insulation; when it exceeds 15mm, the material is wasted and the cost is increased.

Another scheme, the utility model also provides a battery Mylar packaging structure's electric core, including naked electric core and Mylar membrane packaging structure, Mylar membrane packaging structure wraps up the surface of naked electric core.

The beneficial effects of the technical scheme are as follows:

the utility model wraps the roll core comprehensively to ensure the insulation between the roll core and the shell; through the design to structure on the top layer, make top cap and Mylar membrane can accurate location cooperation, make electrolyte can flow to electric core through this hole and roll up the core inside, guarantee electric core safe and reliable.

The utility model reduces the process of sticking the whole piece of glue on the side edge, reduces the manufacturing process of the cell and reduces the cost; the Mylar ending rubberizing frequency is reduced, only three lateral side rubberizing (single side) rubberizing is needed to be pasted, bottom rubberizing is reduced, the process is simplified, and the cost is reduced. The sealing is arranged on the large surface, so that the operation is easier in the production process, and the adhesive tape is more firm.

Drawings

Fig. 1 is a schematic perspective view of a Mylar packaging structure of a battery of the present invention;

fig. 2 is a schematic diagram of an expanded structure of the Mylar packaging structure of the present invention;

fig. 3 is a schematic diagram of the packaging adhesive of the battery Mylar packaging structure of the present invention;

wherein 1 is a front face first area, 2 is a top area, 3 is a back face area, 4 is a bottom area, 5 is a front face second area, 6 is a positioning hole, 7 is an electrolyte through hole, and 8 is an air hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further explained below with reference to the accompanying drawings.

In this embodiment, referring to fig. 1-2, a Mylar packaging structure for a battery includes a Mylar film having a rectangular structure, where the Mylar film includes 5 regions sequentially arranged, where the 5 regions are a first front region 1, a top region 2, a back region 3, a bottom region 4, and a second front region 5, the Mylar film is wrapped on an outer surface of a bare cell, so that the top region 2 is located at the top of the cell, the bottom region 4 is located at the bottom of the cell, the back region 3 is located at the back of the cell, the first front region 1 and the second front region 5 are located at the front of the cell, and the Mylar film further includes side regions at two sides wrapped on a side wall of the bare cell; the top area 2 is provided with a positioning hole 6 and an electrolyte channel which are communicated with the top cover, and the bottom area 4 is provided with an electrolyte channel.

As an optimization scheme 1 of the above embodiment, the positioning holes arranged on the top region 2 include a lower boss positioning hole of the top cover positive post, a lower boss positioning hole of the negative post and a top cover liquid injection positioning hole, so that the top cover and the Mylar film can be accurately positioned and matched; and an electrolyte through hole 7 communicated with the top cover liquid injection hole is formed in the top area 2, so that electrolyte can flow into the core of the battery core through the hole.

Preferably, the electrolyte through holes 7 are array-type small round holes, so that the Mylar-wrapped roll core electrolyte and the Mylar external electrolyte are circulated mutually, and the balance of the internal external electrolyte of the bare cell is ensured.

As an optimization scheme 2 of the above embodiment, the top area 2 is further provided with an air vent 8. When the battery generates gas in the use process, the gas is transmitted to the explosion-proof valve right above the battery through the air holes 8, and when the inside of the battery reaches a certain air pressure, the explosion-proof valve is opened to release the air, so that the explosion of the battery is avoided.

Preferably, the air holes 8 are formed by a plurality of densely distributed small holes and are arranged in the middle of the high-temperature insulating layer. The accuracy of gas conduction is improved.

As an optimization scheme 3 of the embodiment, the sum of the widths of the side edge areas at the two sides of the mylar film is 5-15mm larger than the width of the bottom area 4. When the thickness is less than 5mm, edge folding difficulty can be caused, and incomplete overlapping can be caused to cause unsatisfactory insulation; when it exceeds 15mm, the material is wasted and the cost is increased.

For better understanding, the utility model discloses, following is to the theory of operation of the utility model make a complete description:

the Mylar core penetrates through the liquid injection hole in the lower portion of the top cover from the top, and the lower boss of the negative pole column wraps the battery core, the Mylar tail end is reserved in the large face of the battery core, the side edge is folded and wrapped through the folding area reserved on the Mylar side edge, the battery core is completely wrapped inside the Mylar, and insulation between the battery core and the shell is guaranteed.

The utility model reduces the process of sticking the whole piece of glue on the side edge, reduces the manufacturing process of the cell and reduces the cost; the Mylar ending rubberizing frequency is reduced, as shown in figure 3, only three layers of side rubberizing (single side) are needed to be pasted, and bottom rubberizing is reduced.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The Mylar packaging structure of the battery is characterized by comprising a Mylar film with a rectangular structure, wherein the Mylar film comprises 5 areas which are sequentially arranged, the 5 areas are a first front area (1), a top area (2), a back area (3), a bottom area (4) and a second front area (5), the Mylar film is wrapped on the outer surface of a naked electric core, the top area (2) is arranged at the top of the electric core, the bottom area (4) is arranged at the bottom of the electric core, the back area (3) is arranged at the back of the electric core, the first front area (1) and the second front area (5) are arranged on the front of the electric core, and the Mylar film further comprises side edge areas at two sides wrapped on the side wall of the naked electric core; the top area (2) is provided with a positioning hole (6) and an electrolyte channel which are communicated with the top cover, and the bottom area (4) is provided with an electrolyte channel.

2. The Mylar packaging structure of claim 1, wherein the locating holes provided in the top region (2) comprise a lower boss locating hole of the top cap positive post, a lower boss locating hole of the negative post and a top cap liquid injection locating hole; and an electrolyte through hole (7) communicated with the top cover liquid injection hole is formed in the top area (2).

3. A battery Mylar (r) package according to claim 2, wherein a vent (8) is also provided in the top region (2).

4. A Mylar (r) package of batteries as claimed in claim 3, wherein said air holes (8) are formed by a plurality of closely spaced holes in the middle of the high temperature insulating layer.

5. The Mylar packaging structure of claim 2, wherein the electrolyte through holes (7) are array-type small round holes.

6. The Mylar packaging structure of claim 1, wherein the sum of the widths of the two side regions of the Mylar film is 5-15mm greater than the width of the bottom region (4).

7. A battery cell with a Mylar packaging structure, comprising a bare cell and the Mylar packaging structure of any of claims 1 to 6, wherein the Mylar packaging structure is wrapped around the outer surface of the bare cell.