CN-224204189-U - Insulating protection architecture of lithium cell electricity core aluminum hull surface coating

Abstract

The utility model discloses an insulating protection structure for coating the surface of an aluminum shell of a lithium battery cell, which comprises the aluminum shell of the cell and an insulating coating, wherein the insulating coating comprises a ceramic material, a nano material and a high polymer material, the ceramic material, the nano material and the high polymer material are sequentially coated on the surface of the aluminum shell of the cell, the ceramic material is at least one of alumina, silicon nitride, zirconia and aluminum nitride, the high polymer material is preferably polyimide, and the nano material is nano alumina. The composite material has remarkable advantages in the aspects of material composition, coating process, insulating property, cost, environmental protection and the like, can effectively replace the traditional mylar film, and solves the defects in the prior art. The method has the characteristics of simple process, low cost and excellent performance, and has important application value and market competitiveness in the field of electronic manufacturing.

Inventors

• TIAN TIAN
• PAN LIANJING
• CHEN JIANFENG
• ZHANG YIHUI
• LIANG MAN
• LIU XUEMEI
• ZHOU SONGSONG

Assignees

• 徐州徐工弗迪电池科技有限公司

Dates

Publication Date

20260505

Application Date

20250428

Claims (6)

1. 1. The surface coating insulation protection structure of the lithium battery cell aluminum shell is characterized by comprising the cell aluminum shell and an insulation coating, wherein the insulation coating comprises a ceramic material, a nano material and a high polymer material, the ceramic material, the nano material and the high polymer material are sequentially coated on the surface of the cell aluminum shell, the ceramic material is at least one of aluminum oxide, silicon nitride, zirconium oxide and aluminum nitride, the high polymer material is at least one of polyimide, polyurethane, epoxy resin and polyethylene terephthalate, and the nano material is at least one of nano aluminum oxide, nano silicon nitride, carbon nano tube and graphene.
2. 2. The insulating protection structure for coating the surface of the aluminum cell shell of the lithium battery according to claim 1, wherein the surface of the aluminum cell shell needs to be pretreated before the insulating coating is coated.
3. 3. The lithium battery cell aluminum shell surface coating insulation protection structure of claim 2, wherein the pretreatment adopts at least one of alkaline washing, acid washing, sand blasting and anodic oxidation.
4. 4. The insulating and protecting structure for coating the surface of the aluminum shell of the lithium battery cell according to claim 1, wherein the coating mode is at least one mode selected from spray coating, dip coating, spin coating and chemical vapor deposition.
5. 5. The insulating protection structure for coating the surface of the lithium battery cell aluminum shell according to claim 1 is characterized in that the solid content of the insulating coating is 10% -50%, the viscosity is 10% -1000 mPa & s, the curing treatment temperature is 100-300 ℃ and the curing treatment time is 10-120 minutes.
6. 6. The insulating protection structure coated on the surface of the lithium battery cell aluminum shell is characterized in that the ceramic material is an alumina ceramic coating formed by curing at 200 ℃ for 60 minutes, the high polymer material is a polyimide composite material, the nano material is a nano alumina material, and the nano material and the high polymer material are both cured at 250 ℃ for 90 minutes to form the nano alumina coating and the polyimide composite coating.

Description

Insulating protection architecture of lithium cell electricity core aluminum hull surface coating Technical Field The utility model relates to the technical field of lithium battery manufacturing sites, in particular to an insulating protection structure coated on the surface of an aluminum shell of a battery core of a lithium battery. Background With the increasing demand for batteries for high energy density, long-term stable operation of electric vehicles (e.g., electric automobiles) and portable electronic devices (e.g., smart phones, notebook computers), energy storage devices such as lithium batteries have become a central component of modern society. Lithium batteries are widely used in a variety of fields with their high energy density, long life and lighter weight advantages. However, as the scale of battery applications increases, the safety, stability and durability of batteries are becoming an important point of technological innovation. In the structure of lithium batteries, the battery case is usually made of aluminum, which not only can effectively reduce the weight, but also can provide better mechanical protection. However, due to the electrical conductivity of the aluminum material, the surface of the cell aluminum can often requires the addition of an insulating layer to prevent shorting, improve safety, and effectively isolate the current inside the cell from the external environment. The conventional solution is to coat the battery aluminum case with a film material such as Mylar film (Mylar) to provide insulation protection. However, conventional Mylar films have increasingly exposed some drawbacks, particularly in high temperature, high humidity, and long term use environments. The film material is easily aged, peeled off, deformed, and thus the battery safety is lowered. The technical proposal of the prior art is as follows: CN201822249422.9 provides a Mylar film structure for a lithium battery, a lithium battery assembly structure, and a lithium battery. The Mylar film structure is used for coating the bare cell of the square lithium battery and comprises a rectangular Mylar film and a bottom support sheet connected to the Mylar film. The Mylar film includes a back cover sheet that is attached to the back of the bare cell, and the bottom bracket sheet is made of an electrically insulating material forming a bottom cover sheet that is attached to the bottom of the bare cell. The two front side cover sheets partially overlap and are glued together at the front side of the bare cell, and the bottom cover sheet partially overlaps and is glued to the two front side cover sheets at the front side of the bare cell. CN202420919599.8 provides a structure for improving the corrosion resistance of a battery, a Mylar film and a bottom bracket hole are changed from a one-to-one corresponding design into a staggered design, so that the path of an electron channel and an ion channel which corrode an aluminum shell of the battery is greatly increased, the possibility of contact with the aluminum shell after powder falling of a pole piece is prevented by the design, the probability of corrosion and liquid leakage of the battery is reduced, and the safety performance of the battery is greatly improved. CN202420914448.3 provides a welding device, a packaging welding machine and a manufactured blade battery, the welding mechanism welds the side support piece on the surface of the Mylar film in advance, and when the Mylar film is coated on the surface of the battery core in the following step, the Mylar film can be ensured to be covered on the surface of the battery core smoothly. The prior art has the disadvantages that 1) the Mylar film is expensive, and the production cost of the battery is increased. 2) Mylar film needs cutting, laminating and other procedures, and has complex technological process and low production efficiency. 3) Mylar film mechanical strength is low, and easy damage leads to insulation failure in battery equipment and use, has the potential safety hazard. Therefore, an insulating protection structure needs to be provided on the surface of the lithium battery cell aluminum shell. Disclosure of utility model Aiming at the problems existing in the prior art, the utility model provides a battery protection structure which is formed by coating insulating materials on the surface of an aluminum shell of a battery cell to replace Mylar films. The material has remarkable advantages in the aspects of material composition, coating process, insulating property, cost, environmental protection and the like, can effectively replace the traditional mylar film, and solves the defects in the prior art. The method has the characteristics of simple process, low cost and excellent performance, and has important application value and market competitiveness in the field of electronic manufacturing. The technical scheme includes that the insulating protection structure is coated on the surface of an al