阅读说明：本技术 一种锂离子电池组用中空橡胶复合垫 (Hollow rubber composite pad for lithium ion battery pack ) 是由 沈川杰 李克锋 朱兼 张懋慧 王舒丹 吕士银 杨志云 于 2020-12-10 设计创作，主要内容包括：本发明实施例提供了一种锂离子电池组用中空橡胶复合垫,其特征在于,包括：聚酰亚胺膜、中空橡胶板,其中,所述聚酰亚胺膜为两片,分别粘贴在所述中空橡胶板的两侧,形成所述中空橡胶复合垫；所述中空橡胶复合垫置于应用电池组两个相邻单体电池相邻面之间。(The embodiment of the invention provides a hollow rubber composite pad for a lithium ion battery pack, which is characterized by comprising the following components in parts by weight: the composite pad comprises a polyimide film and a hollow rubber plate, wherein the two polyimide films are respectively adhered to two sides of the hollow rubber plate to form the hollow rubber composite pad; the hollow rubber composite pad is arranged between adjacent surfaces of two adjacent single batteries of the application battery pack.)

1. The utility model provides a lithium ion battery organizes with compound pad of cavity rubber which characterized in that includes: the composite pad comprises a polyimide film and a hollow rubber plate, wherein the two polyimide films are respectively adhered to two sides of the hollow rubber plate to form the hollow rubber composite pad; the hollow rubber composite pad is arranged between adjacent surfaces of two adjacent single batteries of the application battery pack.

2. The hollow rubber composite mat for lithium ion batteries according to claim 1, wherein two polyimide films are respectively attached to both sides of the hollow rubber sheet by adhesive tape.

3. The hollow rubber composite mat for lithium ion batteries according to claim 2, wherein the hollow rubber sheet is one of an aircraft rubber sheet, a silicone rubber sheet, a fluororubber sheet, nitrile rubber, ethylene propylene diene monomer rubber, and the like.

4. The hollow rubber composite mat for lithium ion batteries according to claim 3, wherein the hollow rubber sheet comprises a hollow region and a circumferential region.

5. The hollow rubber composite mat for lithium ion batteries according to claim 4, wherein the hollow rubber sheet has a thickness of 0.4mm to 2 mm.

6. The hollow rubber composite gasket for lithium ion batteries according to claim 5, wherein each side length of the hollow region is 0.5 to 0.8 times each side length of the hollow rubber sheet.

7. The hollow rubber composite mat for lithium ion batteries according to claim 6, wherein the width of the hollow rubber sheet is reduced by 6mm to 2mm based on the width of the unit cell.

8. The hollow rubber composite gasket for lithium ion batteries according to claim 7, wherein the length of the hollow rubber sheet is reduced by 4mm to 2mm based on the width of the unit cell.

9. The hollow rubber composite mat for lithium ion batteries according to claim 8, wherein the polyimide film has a thickness of 0.025mm to 0.1 mm.

10. The hollow rubber composite mat for lithium ion batteries according to claim 1, wherein the unit cells are square lithium ion battery cells of a metal can structure.

Technical Field

A hollow rubber composite pad for a lithium ion battery pack, in particular to a hollow rubber composite pad with stable structure for a square lithium ion battery pack with a metal shell of a lithium ion battery monomer.

Background

The hollow rubber pad has the characteristics of large friction force, compressibility and light weight, and can overcome the deformation of the single battery in the charging and discharging process. However, the single hollow rubber pad also has some disadvantages in practical applications, resulting in limitations in its numerous applications. When the single batteries are assembled, a mutual extrusion pressure F1 is generated between the single batteries, furthermore, the pressure generated by the single batteries on the rubber pad in the middle is F2, and an outward pushing force F3 is formed because the contact surfaces of the single batteries and the rubber pad actually have certain radian. When the battery cell was assembled, the demand of high strength was considered, the coating silicon rubber bonds between general rubber pad and the battery cell, however the silicon rubber was in when the mobile state before the solidification, the coefficient of friction at bonding interface was unusual on the low side, lead to the frictional force slump, outside driving force F3 that the battery cell arc caused is greater than frictional force F, cavity rubber pad takes place deformation under this mechanism, cause the protruding appearance envelope that surpasss the battery cell in cavity rubber pad both sides, lead to follow-up group battery assembly mismatch, cause the quality hidden danger. The invention overcomes the defects of the existing structure, adopts a method of compounding the polyimide film and the rubber pad, solves the problem of volume expansion and deformation of the single battery during charging and discharging, and simultaneously can prevent the deformation of the hollow rubber pad from interfering the subsequent assembly in the assembly process so as to further cause the quality problem.

Disclosure of Invention

The invention aims to provide a hollow rubber composite pad for a lithium ion battery pack, which is characterized by comprising the following components: the composite pad comprises a polyimide film and a hollow rubber plate, wherein the two polyimide films are respectively adhered to two sides of the hollow rubber plate to form the hollow rubber composite pad; the hollow rubber composite pad is arranged between adjacent surfaces of two adjacent single batteries of the application battery pack.

Preferably, the two polyimide films are respectively adhered to two sides of the hollow rubber plate through adhesive sticker, so that the technical effects of combination of structural stability, insulation reinforcement and the like of the hollow rubber plate are achieved.

Preferably, the hollow rubber plate is one of an aviation rubber plate, a silicon rubber plate, a fluororubber plate, nitrile rubber, ethylene propylene diene monomer rubber and the like.

Preferably, the hollow rubber plate comprises a hollow area and a circumferential area, the hollow area achieves the technical effect of accommodating the charge and discharge deformation amount of the single battery, the circumferential area achieves the combined technical effects of arc matching, friction force increasing, rotating torque force increasing and the like, and the technical effect of improving the shock resistance is further achieved.

Preferably, the thickness of the hollow rubber plate is 0.4-2 mm, and the hollow rubber plate is matched with the deformation quantity of charging and discharging, so that the technical effects of optimal combination of deformation quantity, arc matching, shock resistance and the like are achieved.

Preferably, each side length of the hollow area is 0.5-0.8 times of that of the hollow rubber plate, and the technical effect of optimal pressure distribution is achieved.

Preferably, the width of the hollow rubber plate is reduced by 6-2 mm based on the width of the single battery, so that the technical effect of assembly matching after extrusion matching deformation is achieved.

Preferably, the length of the hollow rubber plate is reduced by 4-2 mm based on the width of the single battery, so that the technical effect of assembly matching after extrusion matching deformation is achieved.

Preferably, the thickness of the polyimide film is 0.025 mm-0.1 mm, and the technical effects of the minimum thickness of the polyimide film and the optimal combination of mechanical property and tensile resistance are achieved.

Preferably, the single battery is a square lithium ion battery cell with a metal shell structure.

This patent has the advantage as follows:

(1) the hollow rubber composite pad still keeps a hollow structure, and can overcome the volume change caused by the deformation of the single battery in the charge and discharge process.

(2) The hollow rubber pad in the middle of the hollow rubber composite pad has compressibility, can be better automatically matched and adapted to the arc contact surface of the square lithium ion battery with the metal shell, provides larger friction force and better vibration reduction effect, and improves the shock resistance of the application battery pack.

(3) Two layers of polyimide films are adopted in the hollow position of the hollow rubber composite pad, and the double layers of polyimide films can avoid the defect that a single-layer polyimide film is damaged and not insulated, so that the hollow rubber composite pad has better insulating property.

(4) Two layers of polyimide films are adopted in the hollow position of the hollow rubber composite pad, and the double layers of polyimide films can avoid the defect that a single-layer polyimide film is damaged and not insulated, so that the hollow rubber composite pad has better insulating property.

(5) The polyimide film in the hollow rubber composite pad plays a role in stabilizing the structure of the hollow rubber pad, so that the quality problem in the assembly process can be prevented, and the reliability of the battery pack is ensured.

(6) The hollow rubber composite pad is simple to manufacture, can be popularized and applied in a large quantity, and has great economic benefit.

Drawings

FIG. 1 is a schematic view of a hollow rubber composite pad according to the present invention;

FIG. 2 is a schematic view showing the installation relationship between a lithium ion battery cell and a hollow rubber composite pad according to the present invention;

FIG. 3 is a schematic structural view of a hollow rubber sheet according to the present invention;

fig. 4 is a schematic size diagram of a lithium ion single battery in a battery pack according to the present invention;

FIGS. 5(a) and 5(b) are cross-sectional stress analysis diagrams of single and composite hollow rubber gaskets of the invention under the action of extrusion force, respectively;

fig. 6(a) and fig. 6(b) are graphs comparing the deformation of the single and composite hollow rubber mats under the action of pressing force.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The invention provides a hollow rubber composite pad for a lithium ion battery pack, which is characterized by comprising the following components in percentage by weight: the composite pad comprises a polyimide film and a hollow rubber plate, wherein the two polyimide films are respectively adhered to two sides of the hollow rubber plate to form the hollow rubber composite pad; the hollow rubber composite pad is arranged between adjacent surfaces of two adjacent single batteries of the application battery pack.

According to one embodiment of the present invention, two pieces of the polyimide film are respectively attached to both sides of the hollow rubber plate by a non-setting adhesive.

According to an embodiment of the present invention, the hollow rubber plate is one of an aircraft rubber plate, a silicone rubber plate, a fluororubber plate, nitrile rubber, ethylene propylene diene monomer rubber, and the like.

According to one embodiment of the present invention, the hollow rubber sheet includes a hollow region and a circumferential region.

According to one embodiment of the present invention, the hollow rubber sheet has a thickness of 0.4mm to 2 mm.

According to one embodiment of the present invention, each side length of the hollow area is 0.5 to 0.8 times of each side length of the hollow rubber sheet.

According to one embodiment of the present invention, the width of the hollow rubber sheet is reduced by 6mm to 2mm based on the width of the unit cell.

According to one embodiment of the present invention, the length of the hollow rubber sheet is reduced by 4mm to 2mm based on the width of the unit cell.

According to one embodiment of the present invention, the polyimide film has a thickness of 0.025mm to 0.1 mm.

According to one embodiment of the invention, the single battery is a square lithium ion battery cell with a metal shell structure.

The following describes the technical aspects of the present invention with specific examples.

As shown in fig. 1, a structurally stable hollow rubber composite mat for a lithium ion battery pack includes a polyimide film layer 11, a hollow rubber sheet 12; one side of each of the two polyimide film layers 11 is coated with adhesive sticker and is adhered to the hollow rubber plate 12.

As shown in fig. 2, the adhered hollow rubber composite layer is placed in a lithium ion battery pack to be assembled, two surfaces of the hollow rubber composite layer are respectively contacted with adjacent surfaces of two adjacent single batteries of the battery pack, and the single batteries are square lithium ion battery monomers with a metal shell structure.

As shown in fig. 3, the hollow rubber plate 2 is one of an aviation rubber plate, a silicone rubber plate, a fluororubber plate, nitrile rubber, ethylene propylene diene monomer rubber, and the like, so as to ensure that the composite layer can be properly deformed to match the plane of the single battery, increase the contact area, and improve the friction force, and meanwhile, the body is an elastic body, so that the internal anti-seismic performance can be improved to a certain extent. The overall dimension is rectangular and is matched with the overall dimension of the single battery, so that the insulating and isolating effects can be achieved. The hollow rubber plate 2 comprises a hollow area 201 and a circumferential area 202, and the thickness is 0.4 mm-2 mm, so as to adapt to the maximum value of the size change of the lithium ion single battery (as shown in fig. 4) in the charging and discharging process. The width a1 of the hollow rubber plate is reduced by 6 mm-2 mm based on the width a3 of the single battery, and the length b1 is reduced by 4 mm-2 mm based on the width b3 of the single battery, so that the effective isolation of the single battery is ensured, and the shape enveloping range of the single battery at two sides or protruding up and down caused by the extrusion deformation of the hollow rubber plate 2 can be prevented. The size a2 of the hollow position of the hollow rubber plate is k1 × a1, b2 is k2 × b1, the value of k1 ranges from 0.5 to 0.75, and the value of k2 ranges from 0.5 to 0.8, so that the hollow rubber gasket is ensured to deform to meet the requirement of matching with the arc-shaped structure of the lithium ion single battery, and meanwhile, irreversible compression deformation caused by the fact that the area of the residual rubber gasket is too small is prevented.

The polyimide film is a polyimide insulating film material, the polyimide material has quite good insulating property, and the two layers of films can effectively prevent the middle positions of adjacent single batteries from being contacted and conducted; the thickness of the polyimide film layer is 0.025 mm-0.1 mm, on one hand, the thickness of the film can be reduced, and further the volume of the battery pack is reduced, and meanwhile, the tensile force formed by the strength of the lowest thickness of the film can ensure that the whole hollow rubber composite pad is not extruded outwards when being extruded.

The hollow rubber pad has the characteristics of large friction force, compressibility and light weight, and can overcome the deformation of the single battery in the charging and discharging process. However, the single hollow rubber pad also has some disadvantages in practical applications, resulting in limitations in its numerous applications. As shown in fig. 5(a) and 5(b), when the single batteries are assembled, a mutual pressing pressure F1 is generated between the single batteries, and further, the pressure generated by the single batteries on the rubber pad in the middle is F2, and since the contact surface between the single batteries and the rubber pad is actually provided with a certain radian, an outward pushing force F3 is generated. When the single battery is assembled, considering the requirement of high strength, the rubber gasket and the single battery are generally coated with silicon rubber for bonding, however, when the silicon rubber is in a flowing state before curing, the friction coefficient of a bonding interface is abnormally low, so that the friction force is suddenly reduced, an outward driving force F3 caused by the arc shape of the single battery is greater than the friction force F, and the hollow rubber gasket is deformed under the mechanism, so that the two sides of the hollow rubber gasket protrude out of the shape envelope of the single battery (as shown in fig. 6 (a)), so that the subsequent assembly of a battery pack is not matched, and the quality hidden trouble is caused.

It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.