CN211829077U

CN211829077U - Anticorrosion electric core

Info

Publication number: CN211829077U
Application number: CN202020308254.0U
Authority: CN
Inventors: 赵冠宇; 黄昌玥; 杨涛涛; 崔晓莉; 沈飞; 李斌; 沈志鸿
Original assignee: Kunshan Synergy Energy Technology Co ltd
Current assignee: Kunshan Synergy Energy Technology Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-10-30
Anticipated expiration: 2030-03-13

Abstract

The utility model discloses an anti-corrosion battery cell, which comprises a battery cell body, electrolyte and an aluminum bag, wherein the battery cell body consists of a positive pole piece, a diaphragm and a negative pole piece; the battery cell comprises a battery cell body and is characterized in that an anti-corrosion layer is arranged on the battery cell body, and the thickness of the anti-corrosion layer is larger than the burr specification. The anti-corrosion layer is a polymer fiber layer or a thermal shrinkage sleeve film which is coated outside the battery cell body in the whole area; or the anticorrosive layer is an adhesive tape, a diaphragm or capacitance paper, and the adhesive tape, the diaphragm or the capacitance paper is pasted on the upper surface and the lower surface of the battery cell body; or the anticorrosive layer is an adhesive tape or a diaphragm, and the adhesive tape or the diaphragm is stuck outside the battery cell body in an assembled manner. The utility model provides a pair of anticorrosion electric core sets up the anticorrosive coating outside electric core body, avoids negative pole piece and aluminium bag direct contact, reduces the risk that electric core was corroded.

Description

Anticorrosion electric core

Technical Field

The utility model relates to an anticorrosion electric core belongs to small-size battery packaging technology field.

Background

With the continuous development of electronic products, people have higher and higher requirements on battery technology, and lithium ion batteries are widely applied due to the advantages of small size, long service life, high safety performance and the like, compared with the traditional batteries, such as environmental protection. The lithium ion battery product specification comprises a cylinder, a square shell, a button, a soft package battery and the like, wherein an internal battery core body is usually formed by winding or stacking a positive electrode plate, a diaphragm and a negative electrode plate, and then the battery is assembled with an electrolyte, an aluminum plastic film or an aluminum bag, a guide handle, an adhesive tape, a protection circuit, a protection shell and other related components.

Current electric core especially soft-packaged electric core generally wraps up plastic-aluminum membrane or aluminium bag at the outer parcel of electricity core body, if the negative pole direct contact of aluminium bag and electricity core body has ion channel corrosion risk: microcracks are generated on the aluminum bag, and the aluminum bag is in contact with the electrolyte, so that potential safety hazards of corrosion of the battery cell are caused; the aluminum layer is broken and moisture enters through the broken hole, causing severe corrosion and flatulence. If the electrolyte contacts moisture: the electrolyte mixes with the water vapor to generate HF which corrodes the exposed aluminum layer, and there is usually a significant gas and liquid leakage.

SUMMERY OF THE UTILITY MODEL

The purpose is as follows: in order to overcome the not enough that exists among the prior art, the utility model provides an anticorrosion electric core avoids the negative pole piece and the aluminium bag direct contact of electric core body, reduces the risk that electric core was corroded.

The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:

the utility model provides an anticorrosion electric core, includes the electric core body of compriseing positive pole piece, diaphragm, negative pole piece, electrolyte and aluminium bag, be equipped with the anticorrosive coating on the electric core body, the thickness of anticorrosive coating is greater than the burr specification, the burr specification is (1/2) D +1um, and D is diaphragm thickness, and the unit is um.

Furthermore, the anticorrosive layer is a polymer fiber layer or a heat-shrinkable sleeve film which is coated outside the battery cell body in the whole area.

Further, the fibers in the polymer fiber layer are nano-scale artificial fibers, and the artificial fiber material is nylon, PET, PAN, PP, PI, PE or PVA; the polymer fiber layer is prepared by an electrostatic spinning method, a melt-blown spinning method or a sea-island composite spinning method.

Further, the anticorrosive layer is an adhesive tape, a diaphragm or capacitance paper, and the adhesive tape, the diaphragm or the capacitance paper is attached to the upper surface and the lower surface of the cell body.

Further, the anticorrosive layer is an adhesive tape or a diaphragm, and the adhesive tape or the diaphragm is attached to the outside of the battery cell body in an assembling manner.

Further, the adhesive tape comprises a release layer, a substrate film layer and a bonding layer, wherein the substrate film layer is a PET film, and the bonding layer is acrylic adhesive.

Further, the separator includes a base film and a coating layer, and the base film is PE or PP.

Has the advantages that: the utility model provides an anticorrosion electric core, the anticorrosion layer is arranged outside the electric core body, the direct contact between the negative pole piece and the aluminum bag is avoided, and the risk of corrosion of the electric core is reduced; meanwhile, the anticorrosive layer has good electrolyte wettability and cannot shrink or deform, the functions of the internal structures of other batteries are not influenced after the anticorrosive layer is added, the electrochemical reaction is not participated, and the appearance of the battery is not influenced after the anticorrosive layer is assembled.

Drawings

Fig. 1 is an overall and exploded schematic view of an anticorrosion layer coated outside a cell body in a full area in example 1;

fig. 2 is an overall and exploded schematic view of an anticorrosion layer attached to the upper and lower surfaces of a cell body in embodiment 2;

fig. 3 is an overall and exploded schematic view of an assembled anticorrosion layer attached to the outside of a cell body in embodiment 3.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Example 1

An anti-corrosion battery cell comprises a battery cell body consisting of a positive pole piece, a diaphragm and a negative pole piece, electrolyte and an aluminum bag. Be equipped with the anticorrosive coating on the electricity core body, the thickness of anticorrosive coating is greater than the burr specification, avoids the puncture risk, the burr specification is (1/2) D +1um, and D is diaphragm thickness, and the unit is um.

The anticorrosive layer is a polymer fiber layer or a heat-shrinkable sleeve film which is coated outside the battery cell body in the whole area, as shown in figure 1. The fibers in the polymer fiber layer are nano-scale artificial fibers, and the artificial fiber material is nylon, PET, PAN, PP, PI, PE or PVA; the polymer fiber layer is prepared by an electrostatic spinning method, a melt-blown spinning method or a sea-island composite spinning method. The polymer fiber layer in the embodiment has a plurality of nano holes, a high specific surface area and good electrolyte wettability.

Example 2

The anticorrosive layer is an adhesive tape, a diaphragm or capacitance paper, and the adhesive tape, the diaphragm or the capacitance paper is attached to the upper surface and the lower surface of the battery cell body, as shown in fig. 2. The adhesive tape comprises a release layer, a substrate film layer and an adhesive layer, wherein the substrate film layer is a PET film which is moderate in thickness and high-temperature resistant; the adhesive layer is acrylic adhesive.

The diaphragm comprises a base film and a coating layer, wherein the base film is PE or PP, and the coating layer is made of Al₂O₃、Mg(OH)₂、ZrO、SiO₂、TiO₂PVDF, or a mixture of two or more of them, can reduce heat energy accumulation.

The capacitor paper can store 1-20 mu F capacitor capacity, has small thickness of generally 6-20 mu m, has higher tensile strength, can be wound into a battery cell with large capacity and small volume, and has wide capacity range, high working voltage and low cost.

Example 3

The anti-corrosion layer is an adhesive tape or a diaphragm, the adhesive tape or the diaphragm is attached to the outside of the cell body in an assembled manner, as shown in fig. 3, the adhesive tape or the diaphragm is cut into a polyhedral unfolded drawing matched with the cell body by a die cutting process, and the polyhedral unfolded drawing is coated outside the cell body. The adhesive tape comprises a release layer, a substrate film layer and an adhesive layer, wherein the substrate film layer is a PET film which is moderate in thickness and high-temperature resistant; the adhesive layer is acrylic adhesive.

The diaphragm comprises a base film and a coating layer, wherein the base film is PE or PP, and the coating layer is made of Al₂O₃、Mg(OH)₂、ZrO、SiO₂、TiO₂And PVDF, or a mixture of two or more thereof.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides an anticorrosion electric core, includes the electric core body of constituteing by positive pole piece, diaphragm, negative pole piece, electrolyte and aluminium bag, its characterized in that: be equipped with the anticorrosive coating on the electricity core body, the thickness of anticorrosive coating is greater than the burr specification, the burr specification is (1/2) D +1um, and D is diaphragm thickness, and the unit is um.

2. A corrosion protection cell according to claim 1, wherein: the anticorrosive layer is a polymer fiber layer or a thermal shrinkage sleeve film which is coated outside the battery cell body in the whole area.

3. A corrosion protection cell according to claim 2, wherein: the fibers in the polymer fiber layer are nano-scale artificial fibers, and the artificial fiber material is nylon, PET, PAN, PP, PI, PE or PVA; the polymer fiber layer is prepared by an electrostatic spinning method, a melt-blown spinning method or a sea-island composite spinning method.

4. A corrosion protection cell according to claim 1, wherein: the anti-corrosion layer is an adhesive tape, a diaphragm or capacitance paper, and the adhesive tape, the diaphragm or the capacitance paper is attached to the upper surface and the lower surface of the battery cell body.

5. A corrosion protection cell according to claim 1, wherein: the anticorrosive layer is an adhesive tape or a diaphragm, and the adhesive tape or the diaphragm is stuck outside the battery cell body in an assembled manner.

6. A corrosion-resistant cell according to claim 4 or 5, wherein: the adhesive tape comprises a release layer, a substrate film layer and a bonding layer, wherein the substrate film layer is a PET film, and the bonding layer is acrylic adhesive.

7. A corrosion-resistant cell according to claim 4 or 5, wherein: the diaphragm comprises a base film and a coating layer, wherein the base film is PE or PP.