CN214496162U

CN214496162U - Adhesive tape for fixing battery cell and battery cell comprising adhesive tape

Info

Publication number: CN214496162U
Application number: CN202022689047.7U
Authority: CN
Inventors: 晋沛沛; 赖旭伦; 孙先维; 陈杰; 杨山; 郑明清; 李载波
Original assignee: Huizhou Liwei Electronic Technology Co ltd
Current assignee: Huizhou Liwei Electronic Technology Co ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-10-26
Anticipated expiration: 2030-11-19

Abstract

The invention provides an adhesive tape for fixing a battery cell, which comprises: a first fastening region and a nonwoven region; the non-woven fabric area is fixedly connected with the first fixing area; wherein the porosity of the non-woven fabric area is 30-70%. Compared with the prior art, the utility model provides a sticky tape has increased non-woven fabrics structure, still can keep the required requirement of bonding fixed electric core of sticky tape on the one hand, and on the other hand utilizes the structure of non-woven fabrics itself and the porosity structure that has for the part of the fixed electric core in non-woven fabrics district can be through electrolyte and infiltration nature good, has improved the middle transmission of hindering electrolyte of present sticky tape greatly, so that the problem of rubberizing department lithium of analyzing. In addition, the adhesive tape is low in preparation cost and simple in method, can solve the problem of lithium precipitation at the bottom of the contact between the adhesive tape and a battery cell, and is more suitable for industrial mass production.

Description

Adhesive tape for fixing battery cell and battery cell comprising adhesive tape

Technical Field

The utility model relates to a laminate polymer battery field, concretely relates to an electric core that is used for fixed sticky tape of electric core and contains this sticky tape.

Background

With the development of lithium ion secondary batteries, coatings become indispensable parts of positive electrodes, negative electrodes and separators, the performance of the coatings directly affects the capacity, the cycle, the safety and other aspects of the batteries, and the design of the top glue and the bottom glue outside the battery core is also important and also affects the performance of the batteries. For example, in the circulation process, the phenomenon of lithium precipitation is found to easily occur at the rubberizing parts of the top glue and the bottom glue, which can affect the use of the product and even cause safety accidents.

It is presently believed that this condition arises because: the rubberizing positions at the top and the bottom influence the transmission of electrolyte in the battery cell, so that the electrolyte at the position is lack, and the cathode at the position cannot be fully infiltrated, thereby causing the lithium precipitation phenomenon at the position. In order to solve the problem, in the industry, perforation is performed between the top glue and the bottom glue to increase the transmission of the electrolyte, but the tensile strength of the adhesive tape is affected, so that the adhesive tape is punctured, and the problem cannot be really solved.

In view of the above, it is necessary to provide a technical solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the utility model provides a sticky tape for electricity core is fixed to solve present apex and the rubberizing position of primer and hindered the transmission of electrolyte, lead to appearing the problem of separating out the lithium phenomenon.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an adhesive tape for cell fixation, comprising:

a first fixing region;

the non-woven fabric area is fixedly connected with the first fixing area;

wherein the porosity of the non-woven fabric area is 30-70%.

Preferably, the pore size of the non-woven fabric region is 20nm to 10 μm.

Preferably, the porosity of the non-woven fabric area is 50-70%, and the pore diameter of the non-woven fabric area is 2-10 μm.

Preferably, the adhesive tape further comprises a second fixing area, wherein the second fixing area is connected with the non-woven fabric area and is far away from the first fixing area.

Preferably, the first fixing area is made of a polyester film or a polypropylene film; the second fixing area is made of a polyester film or a polypropylene film.

Preferably, the first fixing area and the non-woven fabric area are connected in a hot pressing mode, and the second fixing area and the non-woven fabric area are connected in a hot pressing mode.

Another object of the present invention is to provide a battery cell, including the adhesive tape for cell fixation as defined in any of the above, wherein at least a portion of the nonwoven fabric region of the adhesive tape is fixed on the bottom and/or top of the battery cell, and the first fixing region of the adhesive tape is fixed on the main surface of the battery cell in an extending manner.

Preferably, the adhesive tape further comprises a second fixing region, wherein the second fixing region is arranged opposite to the first fixing region and extends and is fixed on the other main surface of the battery cell.

Preferably, the first fixing region, the non-woven fabric region and the second fixing region form a U-shaped structure and are fixed at the bottom and/or the top of the battery cell.

Preferably, the width of the non-woven fabric area is 0.2-5 cm, and the length of the first fixing area extending on the main surface of the battery cell is 0.2-5 cm; the length of the second fixing area extending on the main surface of the battery cell is 0.2-5 cm.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model provides a sticky tape has increased non-woven fabrics structure, still can keep the requirement of the required fixed electric core of bonding of sticky tape on the one hand, and on the other hand utilizes the structure of non-woven fabrics itself and the porosity structure that has for the part of the fixed electric core in non-woven fabrics district can be through electrolyte and infiltration nature good, has improved the middle transmission of hindering electrolyte of present sticky tape greatly, so that the problem of rubberizing department lithium of analyzing. In addition, the adhesive tape is low in preparation cost and simple in method, can solve the problem of lithium precipitation at the bottom of the contact between the adhesive tape and a battery cell, and is more suitable for industrial mass production.

Drawings

Fig. 1 is one of the structural schematic diagrams of the adhesive tape of the present invention.

Fig. 2 is a second schematic structural view of the adhesive tape of the present invention.

Fig. 3 is one of the schematic structural diagrams of the battery cell of the present invention.

Fig. 4 is a second schematic diagram of the battery cell of the present invention.

Fig. 5 is a third schematic diagram of the battery cell of the present invention.

In the figure: 1-adhesive tape; 11-a first fixation area; 12-a nonwoven zone; 13-a second fixation area; 2-the bottom of the cell; 3-the top of the cell; 4-major surface of the cell.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantageous effects will be described in further detail below with reference to the accompanying drawings of the detailed description and the specification, but the present invention is not limited thereto.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; 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.

The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connection mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt prior art, and conventional model, including circuit connection adopts conventional connection mode among the prior art, does not detailed here again.

Embodiment mode 1

As shown in fig. 1-2, an adhesive tape for fixing a battery cell includes: a first fastening region 11 and a nonwoven region 12; the non-woven fabric area 12 is fixedly connected with the first fixing area 11; wherein the porosity of the non-woven fabric area 12 is 30-70%.

Further, the pore size of the non-woven fabric region 12 is 20nm to 10 μm. Preferably, the porosity of the non-woven fabric region 12 is 50 to 70%, and the pore diameter of the non-woven fabric region 12 is 2 to 10 μm. The non-woven fabric is formed by directionally or randomly arranging textile short fibers or filaments to form a fiber web structure, and then the fiber web structure is reinforced by adopting a mechanical method, a thermal bonding method and the like, so that the formed fiber web structure is provided with a large number of through holes and has good flexibility, the fiber web structure is used as a part of the adhesive tape 1 and is arranged at the bottom 2 or the top of the battery cell, and electrolyte can enter the battery cell through a plurality of holes. Compare in the sticky tape 1 of conventional adoption, the utility model discloses a sticky tape 1 is non-woven fabrics structure because of the adoption to can not obstruct the passing through of electrolyte, avoided this part to analyse the problem of lithium from this.

Further, the adhesive tape 1 further comprises a second fixing area 13, and the second fixing area 13 is connected with the non-woven fabric area 12 and is far away from the first fixing area 11. Namely, the non-woven fabric region 12 is arranged between the first fixing region 11 and the second fixing region 13, the first fixing region 11 and the second fixing region 13 ensure that the adhesive tape 1 can still stably fix the battery cell, and the non-woven fabric region 12 supports the electrolyte to pass through, and meanwhile, the tensile strength of the adhesive tape 1 cannot be affected, so that the safety performance of the battery is ensured.

Further, the first fixing area 11 is made of a polyester film or a polypropylene film; the second fixing area 13 is made of a polyester film or a polypropylene film.

Further, the first fastening area 11 and the non-woven area 12 are connected by heat pressing, and the second fastening area 13 and the non-woven area 12 are connected by heat pressing. In the hot pressing process, the polyester film or the polypropylene film is melted and connected with both ends of the non-woven fabric region 12, thereby obtaining the adhesive tape 1 of the present invention. When the adhesive tape 1 is actually applied to fixing an electric core, the fixing of the adhesive tape and the electric core can be realized only by coating the acrylic acid adhesive on the surface of the polyester film or the polypropylene film, which is contacted with the electric core, and the acrylic acid adhesive does not need to be coated in the middle of the first fixing area 11 and the second fixing area 13 because the non-woven fabric area 12 is positioned between the first fixing area and the second fixing area, so that the non-woven fabric area 12 can pass through electrolyte, and the tensile strength of the adhesive tape 1 also meets the requirement of fixing the electric core. Preferably, the hot pressing temperature is 200-300 ℃, and the pressure is 0.8-1.2 MPa. Generally speaking, the melting point of the polyester film is 200-250 ℃, the melting point of the polypropylene film is 140-180 ℃, and the hot pressing temperature and pressure can be specifically selected according to the difference of the materials adopted by the first fixing area 11 and the second fixing area 13 in the actual production, so that the non-woven fabric area 12 can be stably connected with the first fixing area 11 and/or the second fixing area 13.

Embodiment mode 2

As shown in fig. 3 to 5, a battery cell includes the adhesive tape 1 for cell fixation according to embodiment 1, at least a part of the nonwoven fabric region 12 of the adhesive tape 1 is fixed on the bottom 2 and/or the top of the battery cell, and the first fixing region 11 of the adhesive tape 1 is fixed to the main surface 4 of the battery cell in an extending manner.

The battery core is mainly used in a polymer soft package battery. This electric core is coiled or the lamination by positive pole, diaphragm and negative pole and forms, and the anodal welding has anodal ear, and the negative pole welding has the negative pole ear, and wherein preferred mode is the anodal negative pole ear of same limit play to go out utmost point ear end and be the top 3 of electric core, the preferred mode that sets up of sticky tape 1 has following several kinds: 1) the adhesive tape 1 for fixing the upper end of the battery cell and the adhesive tape 1 for fixing the lower end of the battery cell are arranged as one adhesive tape 1, the non-woven fabric region 12 is adopted to cover and fix the upper end of the battery cell and the bottom of the battery cell, the fixing region can be adopted to cover and design the battery cell when the battery cell passes through the main surface 4 of the battery cell, the non-woven fabric can be adopted to cover and fix the battery cell, the fixing region is adopted to fix the battery cell at least on one side of the battery cell, the tensile strength of the adhesive tape 1 is guaranteed, and the preferable main surface 4 of the battery cell is fixed and covered by the fixing region. 2) The adhesive tape 1 for fixing the upper end of the battery cell and the adhesive tape 1 for fixing the lower end of the battery cell are at least two adhesive tapes 1, wherein the adhesive tape 1 for fixing the upper end of the battery cell is arranged between the positive and negative lugs, one or two or more adhesive tapes 1 for fixing the bottom of the battery cell can be arranged, if one adhesive tape 1 is arranged, the top adhesive tape 1 can be correspondingly arranged, and if two adhesive tapes 1 are arranged, the centers of the two adhesive tapes 1 can be respectively aligned with the positive and negative lugs. For specific materials for preparing the positive electrode, the diaphragm and the negative electrode, reference can be made to the existing polymer soft package battery, and details are not repeated here.

Further, the adhesive tape 1 further includes a second fixing region 13, where the second fixing region 13 is disposed opposite to the first fixing region 11 and extends and is fixed on the other main surface of the battery cell.

Further, the first fixing area 11, the non-woven fabric area 12 and the second fixing area 13 form a "U" shaped structure and are fixed on the bottom 2 and/or the top of the cell. When viewed from the front side of the cell, the adhesive tape 1 disposed at the bottom of the cell is in a "U" shape, and the adhesive tape 1 disposed at the top of the cell is reversely buckled thereon in a "U" shape, wherein two vertical bars of the "U" shape can be regarded as the positions of the first fixing area 11 and the second fixing area 13, and the connection arc portion of the two vertical bars is the position of the non-woven area 12.

Further, the width of the non-woven fabric area 12 is 0.2-5 cm, and the length of the first fixing area 11 extending on the main surface of the battery cell is 0.2-5 cm; the length of the second fixing area 13 extending on the main surface of the battery cell is 0.2-5 cm. Correspondingly, the width of the first fixing area 11 and the second fixing area 13 is also 0.2-5 cm, so that the non-woven fabric can be better matched.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. An adhesive tape for fixing a battery cell, comprising:

a first fixing zone (11);

a non-woven region (12) which is fixedly connected with the first fixing region (11);

wherein the porosity of the non-woven fabric area (12) is 30-70%.

2. Adhesive tape according to claim 1, characterized in that the pore size of the nonwoven area (12) is 20nm to 10 μm.

3. The adhesive tape according to claim 2, wherein the porosity of the nonwoven region (12) is 50 to 70%, and the pore size of the nonwoven region (12) is 2 to 10 μm.

4. Adhesive tape according to any one of claims 1 to 3, characterised in that it further comprises a second fastening zone (13), said second fastening zone (13) being arranged in connection with said nonwoven zone (12) and remote from said first fastening zone (11).

5. Adhesive tape according to claim 4, characterized in that the first fastening area (11) is made of a polyester film or a polypropylene film; the second fixing area (13) is made of a polyester film or a polypropylene film.

6. Adhesive tape according to claim 5, characterised in that the first fastening area (11) is connected to the nonwoven area (12) by means of heat and pressure, and the second fastening area (13) is connected to the nonwoven area (12) by means of heat and pressure.

7. A battery cell, characterized in that, comprises the adhesive tape (1) for cell fixation of any claim 1 to 6, at least a part of the non-woven fabric region (12) of the adhesive tape (1) is fixed on the bottom and/or top of the battery cell, and the first fixing region (11) of the adhesive tape (1) is fixed on the main surface (4) of the battery cell in an extending way.

8. The cell of claim 7, wherein the adhesive tape (1) further comprises a second fixing region (13), wherein the second fixing region (13) is arranged opposite to the first fixing region (11) and extends and is fixed on the other main surface of the cell.

9. The cell of claim 8, wherein the first fixing region (11), the non-woven fabric region (12) and the second fixing region (13) form a "U" shaped structure fixed on the bottom and/or top of the cell.

10. The cell of claim 9, wherein the non-woven fabric region (12) has a width of 0.2 to 5cm, the first fixing region (11) extends over a major surface of the cell for a length of 0.2 to 5cm, and the second fixing region (13) extends over a major surface of the cell for a length of 0.2 to 5 cm.