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Lithium ion battery plastic casing, lithium ion battery, and manufacturing method of lithium ion battery plastic casing and lithium ion battery

A technology for lithium-ion batteries and plastic casings, applied to battery box/case materials, battery pack components, battery boxes/coatings, etc., can solve problems such as surface cracks, poor appearance, and reduced casing service life, and achieve Improve compressive strength and deformation resistance, improve bad appearance, and improve aging resistance

Inactive Publication Date: 2017-03-29
TIANJIN SINOPOLY NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the following defects: (1) Lithium-ion batteries are prone to pole piece expansion during the cycle charge and discharge process, and the internal pressure of the battery is increased, causing the battery shell to bulge and deform, resulting in an ultra-thick battery, (2) Lithium-ion batteries lose weight during actual use. (3) Plastic shells are prone to material aging such as brittleness, surface cracks, yellowing and fading when used under light or certain harsh environmental conditions. Reduce the service life of the shell, (4) due to the addition of glass fiber reinforcement, the surface of the plastic shell has undesirable appearance phenomena such as floating fibers, and a lithium-ion battery plastic shell, lithium-ion battery and manufacturing method thereof are provided

Method used

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  • Lithium ion battery plastic casing, lithium ion battery, and manufacturing method of lithium ion battery plastic casing and lithium ion battery
  • Lithium ion battery plastic casing, lithium ion battery, and manufacturing method of lithium ion battery plastic casing and lithium ion battery
  • Lithium ion battery plastic casing, lithium ion battery, and manufacturing method of lithium ion battery plastic casing and lithium ion battery

Examples

Experimental program
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Embodiment 1

[0041] A lithium-ion battery plastic case, comprising a body and a cover plate, wherein the upper end of the body is open, the cover plate is arranged at the opening of the upper end of the body, and a safety valve installation hole is arranged on the cover plate; both the body and the cover plate are modified Injection molded polypropylene material.

[0042] The raw material components of the modified polypropylene material are shown in Table 1, wherein the polypropylene is a mixture of high crystalline polypropylene, homopolypropylene and random copolymerized polypropylene in a mass ratio of 1:1:1, and its melt The bulk flow rate is 1-3g / 10min (230℃, 2.16kg); the glass fiber is chopped glass fiber with a length of 0.2-10mm and a diameter of 8-20μm; the compatibilizer is polypropylene grafted with maleic acid, and its grafted The rate is 0.3-1.2%, and the melt flow rate is 50-120g / 10min (230°C, 2.16kg); the antioxidant is Ciba IRGAFOS38. The preparation method of the modifie...

Embodiment 2

[0048] A lithium-ion battery plastic case, comprising a body and a cover plate, wherein the lower end of the body is open, the cover plate is arranged at the opening of the lower end of the body, and a safety valve installation hole is provided on the upper end of the body; both the body and the cover plate are modified Injection molded from non-toxic polypropylene material.

[0049] The raw material components of the modified polypropylene material are shown in Table 1, wherein the polypropylene is a mixture of high crystalline polypropylene, homopolypropylene and random copolymerized polypropylene in a mass ratio of 1:1:1, and its melt The bulk flow rate is 1-3g / 10min (230℃, 2.16kg); the glass fiber is chopped glass fiber with a length of 0.2-10mm and a diameter of 8-20μm; the compatibilizer is polypropylene grafted with maleic acid, and its grafted The rate is 0.3-1.2%, and the melt flow rate is 50-120g / 10min (230°C, 2.16kg); the antioxidant is Ciba IRGAFOS38; the lubricant...

Embodiment 3

[0055] A lithium-ion battery plastic case, comprising a body and a cover plate, wherein the upper end of the body is open, the cover plate is arranged at the opening of the upper end of the body, and a safety valve installation hole is arranged on the cover plate; both the body and the cover plate are modified Injection molded polypropylene material.

[0056] The raw material components of the modified polypropylene material are shown in Table 1, wherein the polypropylene is a mixture of high crystalline polypropylene, homopolypropylene and random copolymerized polypropylene in a mass ratio of 1:1:1, and its melt The bulk flow rate is 1-3g / 10min (230℃, 2.16kg); the glass fiber is chopped glass fiber with a length of 0.2-10mm and a diameter of 8-20μm; the compatibilizer is polypropylene grafted with maleic acid, and its grafted The rate is 0.3-1.2%, and the melt flow rate is 50-120g / 10min (230°C, 2.16kg); the antioxidant is antioxidant 1010; the lubricant is amide grease; the a...

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Abstract

The invention discloses a lithium ion battery plastic casing, a lithium ion battery, and a manufacturing method of the lithium ion battery plastic casing and the lithium ion battery. The lithium ion battery plastic casing comprises a main body and a cover plate; the main body and the cover plate are prepared via injection moulding of a modified polypropylene material comprising 35 to 76.9% of polypropylene, 3 to 7.5% of a mineral filler, 15 to 20% of glass fiber, 5% of grafted polypropylene, and 0.1 to 2.5% of a processing accessory ingredient. The lithium ion battery comprises the lithium ion battery plastic casing. The manufacturing method of the lithium ion battery comprises following steps: 1, the modified polypropylene material is subjected to injection moulding so as to obtain the main body and the cover plate; 2, a battery cell is packaged with the main body, the cover plate is arranged at an opening of the main body, and sealing is carried out via heat melting welding. The lithium ion battery plastic casing is simple in structure, low in production cost, smooth in appearance, uniform in color, high in strength, low in weight loss, excellent in aging resistance, and long in service life; no obvious fiber exposure is observed; and deformation is not easily caused.

Description

technical field [0001] The invention relates to the technical field of power lithium-ion batteries, in particular to a lithium-ion battery plastic case, a lithium-ion battery and a manufacturing method thereof. Background technique [0002] At present, there are mainly four types of power lithium-ion battery casings: stainless steel casing, plastic casing, aluminum casing, and aluminum-plastic film. Among them, the plastic housing is usually injection-molded from polypropylene composite material. Polypropylene composite housing has the advantages of light weight, good insulation, superior corrosion resistance, easy processing and molding, and low price, and has been widely used in power lithium-ion battery housings. [0003] However, the current polypropylene composite battery casings generally have the defects of low strength, easy swelling, bursting, poor heat resistance, and easy deformation under high temperature. A commonly used improvement method is to add inorganic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L51/06C08K13/04C08K7/14C08K5/20C08K5/134C08K5/526C08K5/06C08K5/03C08K3/22H01M2/02B29C47/92B29C48/92H01M50/122H01M50/131H01M50/14H01M50/162
CPCC08L23/12C08L23/14B29C48/92B29C2948/92704C08L2205/025C08L2205/035H01M50/116C08L51/06C08K7/14C08K5/20C08K5/1345C08K13/04C08K5/526C08K5/06C08K3/2279C08K5/03C08K3/38Y02E60/10
Inventor 郭丽媛张自会赵盼虎
Owner TIANJIN SINOPOLY NEW ENERGY TECH
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