CN212366063U

CN212366063U - Battery core with insulation protection film and battery thereof

Info

Publication number: CN212366063U
Application number: CN202020697345.8U
Authority: CN
Inventors: 冯旭东; 韩恒珏; 杨树涛
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-01-15
Anticipated expiration: 2030-04-29

Abstract

The utility model relates to a battery manufacturing technology field discloses an electricity core and battery with insulating protection film, electric core wherein, including electricity core shell and the insulating protection film of cladding at electricity core shell peripheral surface, insulating protection film includes top layer and hot melt inlayer, links to each other through the glue film between top layer and the hot melt inlayer, and the direct hot melt of hot melt inlayer lays the laminating on the surface of electricity core shell. The utility model discloses a mode of hot melt lays laminating multilayer complex film at the surface of electric core casing, avoids the production of bubble or fold, and can not receive the influence of electric core length, simple structure, and product surface is level and smooth, stability is high.

Description

Battery core with insulation protection film and battery thereof

Technical Field

The utility model relates to a battery manufacturing technology field specifically relates to electric core and battery with insulating protection film.

Background

The new energy automobile gradually replaces a fuel oil automobile, and the lithium ion battery is used as a main power source in the new energy automobile, and can meet the requirements of high voltage and long endurance mileage of the automobile only by a large number of series-parallel connection matching groups before loading. However, the more the number of the matched battery cells in one electric vehicle is, the greater the risk is, so that the battery cell capacity is made to be a research direction for improving the energy density of the battery cells and reducing the parallel number of matched groups. Only when the battery is made into a flat strip shape, the battery can meet the requirement of large battery core capacity and improve the heat dissipation performance. In the process of coating the battery cell, the battery cell is longer, the shell is easy to deform, and bubbles and wrinkles are easy to generate when the shell is adhered with an insulating protective film, so that the coating becomes the biggest difficulty in film adhering. In the prior art, a roll-shaped PET film with one side coated with glue is generally used for coating a battery core, the PET film is unfolded before coating, and the side with the glue layer is attached to the surface of a battery core shell through a rubber roll. Because the shell is long and the surface is uneven, bubbles and wrinkles often appear during pasting, thereby causing a great deal of reworking.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the unevenness problem that bubble and fold caused easily appears in the pad pasting surface that prior art exists, providing electric core and the battery that has insulating protection film, laying laminating multilayer complex film at electric core casing's surface through the mode of hot melt, avoiding the production of bubble or fold, and can not receive electric core length's influence, simple structure, product surface is level and smooth, stability is high.

In order to achieve the above object, an aspect of the present invention provides an electrical core with an insulation protection film, including electrical core shell and cladding the insulation protection film on the electrical core shell peripheral surface, insulation protection film includes top layer and hot melt inlayer, the top layer with link to each other through the glue film between the hot melt inlayer, the direct hot melt of hot melt inlayer is laid the laminating and is in on the surface of electrical core shell.

Preferably, the insulation protection film comprises two parts which are respectively hot-melted and attached on the outer surfaces of the upper half part and the lower half part of the electric core shell to form an upper half insulation film and a lower half insulation film.

Preferably, the upper half insulating film and the lower half insulating film form an overlapping region in a thickness direction of the electric core case.

Preferably, the overlapping area is 1/2-2/3 of the total thickness of the electrical core shell.

Preferably, the laying and attaching length of the insulation protection film is the same as the length of the electric core shell.

Preferably, the melting point of the surface layer is higher than that of the hot-melt inner layer.

Preferably, the melting point of the surface layer is 100-200 ℃; the melting point of the hot-melt inner layer is more than 20 ℃.

Preferably, the surface layer is a PET layer; the hot-melt inner layer is a PP or PE layer.

Preferably, the glue layer comprises: a single-component glue layer made of thermoplastic rubber or styrene-butadiene rubber and rosin resin or olefin resin; or, the resin and rosin resin or maleic resin are synthesized into a single-component glue layer; or a water-soluble single-component composite glue layer made of polyvinyl alcohol resin or acrylic resin.

The second aspect of the present invention provides a battery, including the above-mentioned battery cell with an insulating protective film.

Through the technical scheme, the utility model discloses a mode of hot melt lays laminating multilayer complex film at the surface of electric core casing, avoids the production of bubble or fold, and can not receive the influence of electric core length, simple structure, and product surface is level and smooth, stability is high.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the battery cell with the insulation protective film according to the present invention;

fig. 2 is a sectional view of the insulating protective film in fig. 1;

fig. 3 is a schematic view of the overall structure of a battery cell without an insulating protective film;

fig. 4 is a schematic view of the overall structure of a cell provided with an upper-half insulating film;

fig. 5 and 6 are a schematic diagram of the overall structure of the hot-melting laying and bonding device and a schematic diagram of the process position relationship between the battery cell and the bonding device during hot-melting laying and bonding.

Description of the reference numerals

Overlapping region of upper insulating film 202, lower insulating film 210, surface layer 220, adhesive layer 230, hot-melt inner layer 300, hot-melt mold 301, concave cavity 302, cylinder 303, heating tube 304, soft heat-conducting material layer S of upper insulating film 210, lower insulating film 210, insulating protective film 201 of 100-cell 110 electric core shell 200

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally means upper, lower, left, and right as illustrated with reference to the accompanying drawings; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.

As shown in fig. 1 in combination with fig. 3, the utility model provides a battery cell 100 with insulation protection film, including battery cell shell 110 and the cladding at the insulation protection film 200 of the peripheral surface of battery cell shell 110, insulation protection film 200 includes top layer 210 and hot melt inner layer 230, top layer 210 with link to each other through glue film 220 between the hot melt inner layer 230, the direct hot melt of hot melt inner layer 230 is laid the laminating on the surface of battery cell shell 110. According to the above, the utility model discloses a hot melt's mode lays laminating insulating protection film at the surface of electric core casing, insulating protection film is multilayer complex film structure, and the pad pasting mode of hot melt can make electric core avoid the production of bubble or fold at the pad pasting in-process, can not receive the influence of electric core length, even longer electric core also can accomplish fast to reduce and do over again, practice thrift manufacturing cost, simple structure, product surface is level and smooth, stability is high.

As shown in fig. 3 in combination with fig. 4, for convenience of processing, the insulation protection film 200 includes two parts respectively attached to the outer surfaces of the upper half and the lower half of the electrical core shell 110 by thermal fusion, and an upper half insulation film 201 and a lower half insulation film 202 are formed. In other embodiments of the present invention, the upper insulating film 201 and the lower insulating film 202 may be further disposed to be symmetrical up and down with respect to a horizontal axis section of the electrical core shell 110. The upper half insulating film 201 and the lower half insulating film 202 form an overlapping region S in the thickness direction of the electric core case 110. Typically, the overlap region S is 1/2-2/3 of the total thickness of the electrical core shell 110. According to the requirement, the laying and adhering length of the insulating protection film 200 is the same as that of the electric core shell 110, the insulating protection film is completely hot-melted and laid and adhered on the circumferential outer surface of the electric core shell 110, and only the end surfaces on two sides of the electric core are left without laying the insulating protection film. In other embodiments of the present invention, the upper insulating film 201 and the lower insulating film 202 may be aligned with each other along the thickness direction of the core case 110, and the overlapping region S is not formed. In practical applications, whether the overlapping region S is left can be selected according to the processing requirements.

For effective control during the heat-melting process, the melting point of the surface layer 210 is higher than that of the heat-melting inner layer 230. Generally, the melting point of the surface layer 210 is 100-200 ℃; the melting point of the hot melt inner layer 230 is > 20 ℃. Typically, the skin layer is a PET layer; the hot-melt inner layer is a PP or PE layer. In addition, the adhesive layer 220 includes: a single-component glue layer made of thermoplastic rubber or styrene-butadiene rubber and rosin resin or olefin resin; or, the resin and rosin resin or maleic resin are synthesized into a single-component glue layer; or a water-soluble single-component composite glue layer made of polyvinyl alcohol resin or acrylic resin.

A second aspect of the present invention provides a battery, including the electrical core with the insulation protection film 200 as described above. According to the above, the utility model provides a shell surface of electric core in battery has insulating protection film, and this insulating protection film lays the multilayer complex film of laminating through the mode of hot melt at the surface of electric core casing, avoids the production of bubble or fold, and can not receive the influence of electric core length, simple structure, and the product surface is level and smooth, stability is high.

Referring to fig. 5 and 6 in conjunction with fig. 1 to 4, the thermal melting, applying and pasting process of the insulating protective film according to the present invention will be described in detail.

As shown in fig. 5, firstly, at a designated position of the battery core placing process tool to be coated, the cut insulating protection film 200 is placed on the upper surface of the battery core shell 110, and the hot-melt inner layer 230 of the insulating protection film 200 faces to the battery core shell 110 side. The cut insulating protective film 200 has the same length as the core case 110 and has two sides in the width direction each exceeding 1/2-2/3 of the thickness of the battery case so as to form an overlapping area S in the thickness direction of the core case 110. It should be noted that the electric core in this embodiment is generally a long electric core, the electric core casing 110 is generally a flat cuboid, and the length, width and height are respectively from one top corner of the cuboid, and the thickness of the electric core casing refers to the distance in the direction of the height of the cuboid. Next, the hot-melt mold 300 is pressed down by the cylinder 302, so that the concave mold cavity 301 disposed in the hot-melt mold 300 moves from the upper side of the insulating protective film 200 toward the battery, and the concave mold cavity 301 wraps the electric core case 110 of the battery. The interior of the hot melting mold 300 is provided with a heating tube 303, and the inner wall of the concave mold cavity 301 is further provided with a soft heat conducting material layer 304. In order to ensure the adhesion of the insulation protective film, the size of the concave cavity 301 matches the size of the core housing 110. Typically, the surface layer 210 is a layer of PET having a melting point of 100-200 ℃; the hot-melt inner layer 230 is a PP or PE layer, and has a melting point of: is greater than 20 ℃. The temperature of the hot-melt mold 300 is controlled between the melting points of the surface layer 210 and the hot-melt inner layer 230. Since the melting point of the surface layer 210 is higher than that of the hot-melt inner layer 230, the hot-melt inner layer 230 of the insulation protection film 200 is heated and melted under the heating of the heating tube 303 and the heat conduction of the soft heat conduction material layer 304, and is adhered to the surface of the electric core shell 110, while the surface layer 210 has no damage, and is flat and smooth, so as to obtain a semi-finished product as shown in fig. 2, that is: the upper half insulating film 201 attached to the upper half of the core case 110 is thermally fused with the longitudinal cross section of the core case 110 as the center of symmetry. Finally, the hot-melt mold 300 is lifted, the position of the cell is turned over, and the above actions are repeated to complete the lower half insulating film 202, as shown in fig. 1, so as to obtain a finished product. The insulating protective film 200 which is hot-melted and attached on the electric core shell 110 has a smooth and flat surface and no air bubbles or wrinkles.

The utility model discloses a mode of hot melt lays laminating insulating protection film at the surface of electric core casing, insulating protection film is multilayer complex film structure, and the pad pasting mode of hot melt can make electric core avoid the production of bubble or fold at the pad pasting in-process, can not receive the influence of electric core length, even longer electric core also can be accomplished fast to reduce the rework, practice thrift manufacturing cost, simple structure, electric core product stability.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The utility model discloses an in the technical conception scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, for example, can with insulating protection film with the length direction's of electricity core shell cross-section is the center of symmetry, cuts out the edge of first insulating film and lower half insulating film, no longer sets up insulating protection film's overlap region in the side of electricity core. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The utility model provides a battery core with insulation protection film, its characterized in that, including electric core shell (110) and cladding at electric core shell (110) peripheral surface's insulation protection film (200), insulation protection film (200) include top layer (210) and hot melt inlayer (230), top layer (210) with link to each other through glue film (220) between hot melt inlayer (230), direct hot melt of hot melt inlayer (230) is laid the laminating and is in on the surface of electric core shell (110).

2. The electrical core with insulation protection film as recited in claim 1, wherein the insulation protection film (200) comprises two parts respectively attached to the outer surfaces of the upper half part and the lower half part of the electrical core shell (110) by thermal fusion, and an upper half insulation film (201) and a lower half insulation film (202) are formed.

3. The electrical core with the insulation protective film according to claim 2, wherein the upper half insulation film (201) and the lower half insulation film (202) form an overlapping region (S) in a thickness direction of the electrical core shell (110).

4. The electrical core with insulation protective film according to claim 3, characterized in that the overlapping area (S) is 1/2-2/3 of the total thickness of the electrical core shell (110).

5. The electrical core with insulation protection film according to claim 2, wherein the application and attachment length of the insulation protection film (200) is the same as the length of the electrical core shell (110).

6. The battery cell with the insulation protective film according to claim 1, wherein the melting point of the surface layer (210) is higher than that of the hot-melt inner layer (230).

7. The battery cell with the insulation protection film as recited in claim 6, wherein the melting point of the surface layer (210) is 100-200 ℃; the melting point of the hot-melt inner layer (230) is greater than 20 ℃.

8. The battery cell with the insulation protective film according to claim 7, wherein the surface layer (210) is a PET layer; the hot-melt inner layer (230) is a PP or PE layer.

9. The electrical core with insulation protective film according to claim 1, wherein the glue layer (220) is a single-component glue layer;

or the glue layer (220) is a water-soluble single-component composite glue layer.

10. A battery comprising a battery cell (100) with an insulating protective film according to any of claims 1 to 9.