A non-breathable explosion-proof membrane, preparation method and explosion-proof valve for power battery

A gas-permeable, explosion-proof membrane technology, applied in the direction of batteries, battery pack components, circuits, etc., can solve the problems of long-term oil and water resistance, dust resistance, high temperature resistance, chemical corrosion resistance, flame retardancy and electrical insulation, etc. Achieve the effect of excellent flame retardancy and electrical insulation properties

Active Publication Date: 2021-12-21
PAN ASIAN MICROVENT TECH JIANGSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the explosion-proof membrane in the explosion-proof valve body of the power battery basically relies on the puncture structure to achieve blasting, and the explosion-proof membrane used for the explosion-proof valve of the power battery includes PE film, PET film, PP film, etc., which cannot achieve long-term oil and water resistance. , dustproof, high temperature resistance, chemical corrosion resistance, flame retardant and electrical insulation purposes

Method used

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  • A non-breathable explosion-proof membrane, preparation method and explosion-proof valve for power battery
  • A non-breathable explosion-proof membrane, preparation method and explosion-proof valve for power battery

Examples

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Effect test

Embodiment 1

[0022] A non-breathable explosion-proof membrane 3 includes: a non-breathable explosion-proof membrane 2 and an oil- and water-repellent functional coating 1, and the surface of the non-breathable explosion-proof membrane is provided with an oil- and water-repellent functional coating.

[0023] In the embodiment, the non-breathable explosion-proof film 3 precisely controls the critical value of the burst pressure to 25 kPa by controlling the thickness of the non-breathable explosion-proof film 2 to 10 μm and the mechanical strength to 15 MPa.

[0024] The present invention also relates to the preparation process of non-breathable explosion-proof film 2: polytetrafluoroethylene (PTFE) suspension resin or / and modifier is used to mold into a billet, sintered in a sintering furnace at a high temperature of 385°C, and then cooled to form a rod. A non-breathable explosion-proof film 2 of 10 μm is made by turning process and calendering process.

[0025] In the embodiment, the surfac...

Embodiment 2

[0033] A non-breathable explosion-proof membrane 3, comprising: a non-breathable explosion-proof membrane 2 and a surface oil-repellent and water-repellent functional coating 1.

[0034] In the embodiment, the non-breathable explosion-proof film 3 precisely controls the critical value of the burst pressure to 30 kPa by controlling the thickness of the non-breathable explosion-proof film 2 to 12 μm and the mechanical strength to 20 MPa.

[0035] The present invention also relates to the preparation process of the non-breathable explosion-proof film 2: polytetrafluoroethylene (PTFE) suspending resin or / and modifier is used to mold into a billet, sintered in a sintering furnace at a high temperature of 395°C, and then cooled to form a rod. The non-breathable explosion-proof film 2 of 12 μm is made by turning process and calendering process.

[0036] In the embodiment, the surface of the non-breathable explosion-proof membrane 2 is activated, and the surface of the explosion-proof...

Embodiment 3

[0044] A non-breathable explosion-proof membrane 3 includes: a non-breathable explosion-proof membrane 2 and an oil- and water-repellent functional coating 1, and the surface of the non-breathable explosion-proof membrane is provided with an oil- and water-repellent functional coating.

[0045] In the embodiment, the non-breathable explosion-proof film 3 precisely controls the critical value of the burst pressure to 35 kPa by controlling the thickness of the non-breathable explosion-proof film 2 to 30 μm and the mechanical strength to 25 MPa.

[0046] The present invention also relates to the preparation process of non-breathable explosion-proof film 2: polytetrafluoroethylene (PTFE) suspension resin or / and modifier is used to mold into a billet, sintered in a sintering furnace at a high temperature of 385°C, and then cooled to form a rod. A non-breathable explosion-proof film 2 of 30 μm is made by turning process and calendering process.

[0047] In the embodiment, the surfac...

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Abstract

The invention discloses a non-breathable explosion-proof membrane, a preparation method and an explosion-proof valve for a power battery. The non-breathable explosion-proof membrane adopts a polytetrafluoroethylene suspension resin or a polytetrafluoroethylene suspension resin and a modifier and is molded into a billet. After being sintered in the furnace at a high temperature of 385°C-400°C, it is cooled into a rod, and then turned and rolled into a non-breathable explosion-proof film; the non-breathable explosion-proof film is welded on the explosion-proof valve by ultrasonic welding or hot-melt welding. On the ring rib. Through the above method, the non-breathable explosion-proof membrane of the present invention has oil-proof, waterproof, dust-proof, high-temperature resistance, chemical corrosion resistance, excellent flame retardancy and electrical insulation performance, and the explosion-proof valve of the power battery with the explosion-proof membrane has no puncture structure. Under this condition, the explosion-proof membrane can achieve the effect of controlled explosion, effectively suppressing the explosion caused by the rapid rise of the internal pressure of the battery pack or battery box after the failure of the battery core, and avoiding the danger of personal injury.

Description

technical field [0001] The invention relates to a non-breathable explosion-proof membrane, a preparation method and an explosion-proof valve for a power battery. Background technique [0002] The power battery pack mainly uses an explosion-proof valve as an explosion-proof device. The battery explosion-proof valve body generally includes: a body, a pressure relief port, a puncture structure, and an explosion-proof membrane. When the battery core fails, the temperature of the battery pack is too high, the internal gas expands, and the internal pressure of the battery pack gradually increases. When it reaches a certain level, the puncture structure in the explosion-proof valve body will puncture the explosion-proof membrane to achieve rapid pressure relief. Purpose, the existence of the explosion-proof valve improves the safety performance of the power battery. [0003] At present, the explosion-proof membrane in the explosion-proof valve body of the power battery basically r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/342
CPCH01M2200/20H01G9/12Y02E60/10H01M50/30
Inventor 李炳健陈宇峰丁荣华宋海民
Owner PAN ASIAN MICROVENT TECH JIANGSU CORP
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