CN213652353U

CN213652353U - Composite termination adhesive tape for cylindrical battery and cylindrical battery using same

Info

Publication number: CN213652353U
Application number: CN202022859151.6U
Authority: CN
Inventors: 王永湘; 张志平; 侯峰; 郭华军; 徐宁; 赵思湸; 李小兵; 周丹
Original assignee: Dongguan K Tech New Energy Co ltd; Guangdong Greenway Technology Co Ltd
Current assignee: Dongguan K Tech New Energy Co ltd; Guangdong Greenway Technology Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-07-09
Anticipated expiration: 2030-12-02

Abstract

The utility model belongs to the technical field of lithium ion cylinder battery manufacturing and specifically relates to a compound termination sticky tape that cylinder battery used and uses the cylinder battery of this sticky tape, compound termination glue includes three layer construction at least, and its intermediate level is the substrate, and the top surface coating synthetic resin of substrate is as the upper strata, and the bottom surface coating acrylate glue of substrate is as the lower floor, the cylinder battery is including rolling up core and shell, and the skin of rolling up the core is the diaphragm, and outside the core was located to the shell cover, the skin of rolling up the core was pasted foretell compound termination sticky tape, and wherein the acrylate glue contact of compound termination sticky tape rolls up the core, and the synthetic resin of compound termination sticky tape contacts the shell. The utility model discloses a position of book core in the battery can be stabilized to compound termination sticky tape, reduces single cell short circuit, utmost point ear desoldering phenomenon, and has electrolyte resistance can the reinforce, and electrical insulation nature is high, has suitable adhesive force, and the not incomplete glue of obedience and stripping off again is heated and can have characteristics such as suitable inflation.

Description

Composite termination adhesive tape for cylindrical battery and cylindrical battery using same

Technical Field

The utility model belongs to the technical field of lithium ion cylinder battery manufacturing and specifically relates to a compound termination sticky tape that cylinder battery used and uses the cylinder battery of this sticky tape.

Background

The traditional cylindrical battery roll core termination adhesive is used for the termination insulation fixation of the tab position and the winding position of cylindrical, square, medium and small sized lithium electronic batteries, large power lithium electronic batteries and other batteries, has the functions of termination and puncture prevention, generally takes PET/OPP as a base material, is mixed with acrylic ester (acrylic), and has the adhesive force of 1-6N/25 mm.

Traditional cylinder battery rolls up core and goes into the shell in order to reduce when going into the shell the degree of difficulty, can have the matching tolerance, and it is unstable to roll up the core after the existence goes into the shell, and the phenomenon such as monomer battery short circuit, utmost point ear desolder that the vibration arouses, and the termination glue originally is even stronger in cohesive force, and is corrosion-resistant high temperature resistant, but the surface is smooth not have tension, can't fix the book core after rolling up the core and going into the shell.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound sticky tape that stops that cylinder battery used, this compound sticky tape that stops can stabilize the position of rolling up the core in the battery, reduces single cell short circuit, utmost point ear desoldering phenomenon, and has electrolyte-resistant performance reinforce, and electrical apparatus insulating nature is high, has suitable adhesive force, and the not cull of adherence and stripping again is heated and can have characteristics such as suitable inflation.

The utility model discloses a following technical scheme realizes:

the composite stop adhesive tape for the cylindrical battery is provided, and at least comprises a three-layer structure, wherein the middle layer is a base material, the top surface of the base material is coated with synthetic resin to serve as an upper layer, and the bottom surface of the base material is coated with acrylate glue to serve as a lower layer.

Further, the substrate is specifically an opp substrate.

Further, the opp substrate has a thickness of 10-25 μm.

Further, the synthetic resin is a phenol-formaldehyde resin or a vinyl ester resin.

Further, the thickness of the synthetic resin is 10 to 30 μm.

Furthermore, the thickness of the acrylate glue is 15-30 μm.

Still provide a cylinder battery, including rolling up core and shell, the skin of rolling up the core is the diaphragm, outside the core was located to the shell cover, the skin of rolling up the core was pasted foretell compound termination sticky tape, and wherein the acrylic ester glue contact of compound termination sticky tape rolls up the core, and the synthetic resin contact of compound termination sticky tape the shell.

Further, the shell is a steel shell.

Further, the winding core is provided with a structure of a diaphragm-cathode-diaphragm-anode or a structure of a diaphragm-anode-diaphragm-cathode from outside to inside.

The utility model has the advantages that:

1. the synthetic resin used by the composite stop rubber absorbs heat to generate proper expansion in the heating process, so that the position of the roll core can be better stabilized;

2. the composite stop glue contains acrylate glue, has larger adhesive force, can still bind the tail end of the roll core after the roll core is stably rolled by expansion, and improves the winding compactness of the roll core.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention can be implemented according to the content of the description, and in order to make the said and other objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout the drawings.

In the drawings:

FIG. 1 is a schematic structural view of a composite termination tape according to the present invention;

fig. 2 is a schematic structural diagram of the cylindrical battery provided by the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in figure 1, the composite stop adhesive of the present invention has a three-layer structure, wherein the middle layer 2 is an opp substrate with a thickness of 10-25 μm, the top surface of the opp substrate is coated with a synthetic resin with a thickness of 10-30 μm to form an upper layer 1, and the bottom surface of the opp substrate is coated with an acrylate adhesive with a thickness of 15-30 μm to form a lower layer 3, thereby forming the composite stop adhesive.

The synthetic resin is thermosetting resin, belongs to a high molecular polymer with a three-dimensional structure, contains polyfunctional macromolecules in molecular chains, and can be softened (or melted) and simultaneously cured (or cured) into insoluble and infusible high polymers in the presence of a curing agent under the action of heating and pressurizing. Specifically, as the synthetic resin, a phenol-formaldehyde resin (commonly called phenol resin) which is typically used in general, or a vinyl ester resin of model 3202# is used.

The acrylate glue is pressure-sensitive glue, and the type is loctay 3873 acrylic acid glue.

Through this structural design, compound termination glue not only has the gluey great adhesive force of ordinary termination, can stably convolute all the time and roll up a core end, possesses the expansion effect under certain high temperature and electrolyte effect moreover, fills the box hat inner space after the inflation, can avoid rolling up the relative motion of core and box hat when the battery meets the vibration, solves the phenomenon such as the monomer battery short circuit that the vibration arouses, utmost point ear desoldering, and then guarantees and the safety and the life of extension battery.

The utility model discloses a compound stop glue is applicable to various types of cylinder battery to 18650 type battery is as an example, as shown in fig. 2, 18650 type battery roll up core 4 by outer toward the structure of lining diaphragm-negative pole-diaphragm-positive pole, or have the structure of diaphragm-positive pole-diaphragm-negative pole, can be full utmost point ear structure, many utmost point ears or unipolar ear structure on its positive negative pole piece, but roll up outmost the diaphragm that must be of core 4. For 18650 cells, the jelly roll 4 had a table height of 60mm and a diameter of 17.7mm, and its cylindrical steel can 6 had a height of 65mm and a diameter of 18 mm. When the adhesive is used, the composite stop adhesive 5 with the total thickness of 35-75 microns is attached to the outermost layer of the winding core 4, specifically, the lower-layer acrylate adhesive is in contact with the winding core 4, the winding core 4 after the lower layer and the middle layer are stably wound is utilized, then the winding core 4 is placed into a shell, the upper layer is formed into resin to be in contact with the steel shell 6 after the shell is placed, and the steel shell 6 is fixed by utilizing the characteristic of thermal expansion.

The existing stop rubber can not fix the steel shell only by stabilizing the winding core, and can not stabilize the winding core only by fixing the steel shell. The utility model discloses a compound stop is glued can not only be stable with the book core end that the inboard was laminated, and what suitable inflation that can also be heated withstands the box hat inboard for roll up core 4 and 6 formation of box hat are whole.

Use the utility model discloses battery that compound termination was glued can not have obvious internal resistance to change in the battery cylinder test, and wherein cylinder test time is 4 ~ 6 h.

Compare to current stop glue, the utility model discloses a compound stop glue's advantage is:

The substrate in this embodiment is not limited to the opp substrate, and an insulating material such as polypropylene, polyester, or polyimide may be used as the substrate.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, 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 replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The composite termination tape for cylindrical batteries is characterized in that:

the composite stop adhesive at least comprises a three-layer structure, wherein the middle layer is a base material, the top surface of the base material is coated with synthetic resin to serve as an upper layer, and the bottom surface of the base material is coated with acrylate adhesive to serve as a lower layer.

2. The composite termination tape of claim 1, wherein: the substrate is in particular an opp substrate.

3. The composite termination tape of claim 2, wherein: the opp substrate has a thickness of 10-25 μm.

4. The composite termination tape of claim 2, wherein: the synthetic resin is phenol-formaldehyde resin or vinyl ester resin.

5. The composite termination tape of claim 4, wherein: the thickness of the synthetic resin is 10-30 μm.

6. The composite termination tape of claim 5, wherein: the thickness of the acrylate glue is 15-30 μm.

7. Cylindrical battery, including rolling up core and shell, the outer diaphragm that is of rolling up the core, the shell cover is located outside the core, its characterized in that: the composite termination tape of any of claims 1-6 applied to the outer layer of the core, wherein the acrylate glue of the composite termination tape contacts the core and the synthetic resin of the composite termination tape contacts the outer shell.

8. The cylindrical battery according to claim 7, wherein: the shell is a steel shell.

9. The cylindrical battery according to claim 7, wherein: the winding core is provided with a structure of diaphragm-cathode-diaphragm-anode or a structure of diaphragm-anode-diaphragm-cathode from outside to inside.