WO2020215640A1 - 一种非透气型防爆膜、制备方法及动力电池防爆阀 - Google Patents

一种非透气型防爆膜、制备方法及动力电池防爆阀 Download PDF

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WO2020215640A1
WO2020215640A1 PCT/CN2019/113560 CN2019113560W WO2020215640A1 WO 2020215640 A1 WO2020215640 A1 WO 2020215640A1 CN 2019113560 W CN2019113560 W CN 2019113560W WO 2020215640 A1 WO2020215640 A1 WO 2020215640A1
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Prior art keywords
explosion
proof
breathable
membrane
proof membrane
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PCT/CN2019/113560
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English (en)
French (fr)
Inventor
李炳健
陈宇峰
丁荣华
宋海民
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江苏泛亚微透科技股份有限公司
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Publication of WO2020215640A1 publication Critical patent/WO2020215640A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/12—Vents or other means allowing expansion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to a non-permeable explosion-proof membrane, a preparation method and an explosion-proof valve for a power battery.
  • the power battery pack mainly uses an explosion-proof valve as an explosion-proof device.
  • the explosion-proof valve body of the battery generally includes: the body, the pressure relief port, the puncture structure, and the explosion-proof membrane.
  • the temperature of the battery pack is too high, the internal gas expands, and the internal pressure of the battery pack gradually increases.
  • the puncture structure in the explosion-proof valve body will pierce 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.
  • the explosion-proof membrane in the power battery explosion-proof valve body basically relies on the puncture structure to achieve blasting, and the explosion-proof membrane for the power battery explosion-proof valve is non-breathable explosion-proof membranes such as 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.
  • the present invention provides a non-breathable explosion-proof membrane, a preparation method and an explosion-proof valve for the power battery.
  • the main technical problem solved by the present invention is to provide a non-breathable explosion-proof membrane, a preparation method and a power battery explosion-proof valve, which can make the explosion-proof membrane achieve the effect of controlled blasting without piercing the structure; and the explosion-proof membrane has Oil and water proof, dust proof, high temperature resistance, chemical resistance, flame retardant and electrical insulation characteristics.
  • a technical solution adopted by the present invention is to provide a method for preparing a non-breathable explosion-proof film, which includes: adopting polytetrafluoroethylene suspension resin or polytetrafluoroethylene suspension resin and modifiers to be molded into The blank is sintered in a sintering furnace at a high temperature of 385°C-400°C and then cooled into a rod, and then prepared into a non-air-permeable explosion-proof film through a turning process and a calendering process.
  • the surface of the non-air-permeable explosion-proof membrane is further subjected to activation treatment, and then coated with an oil- and water-repellent functional coating to obtain a non-air-permeable explosion-proof membrane with oil and water-repellent functions.
  • the oil-proof grade of the non-breathable explosion-proof membrane reaches 6 or higher.
  • the hot roll gap of the calendering process is 10-15 ⁇ m
  • the calendering temperature is 350°C-380°C
  • the calendering pressure is 10-15MPa.
  • the calendering process parameters are used to control the semi-oriented or oriented film. Its thickness and strength further increase its crystallinity, and the molecular chains are aligned closely after orientation.
  • another technical solution adopted by the present invention is to provide a non-breathable explosion-proof membrane, which is characterized by being prepared by any of the above methods.
  • the thickness of the non-breathable explosion-proof membrane is 5 ⁇ m-50 ⁇ m, and the tensile strength is ⁇ 10MPa.
  • the surface of the non-breathable explosion-proof membrane is provided with an oil- and water-repellent functional coating.
  • another technical solution adopted by the present invention is to provide a power battery explosion-proof valve, including the non-breathable explosion-proof membrane described in the claims, and the non-breathable explosion-proof membrane adopts an ultrasonic welding process or a hot melt welding process Welded on the annular rib of the explosion-proof valve.
  • the non-breathable explosion-proof membrane gradually expands and swells outward due to the force on the inside, and when it reaches the expected set pressure critical value, that is, the tensile strength of the membrane at maximum deformation is less than Internal pressure strength, non-breathable explosion-proof membrane will break and burst along the direction perpendicular to the tensile orientation of the membrane, quickly releasing the internal pressure of the battery pack or battery box.
  • the critical pressure value is 20-35 kPa.
  • the non-breathable explosion-proof membrane of the present invention has oil-proof, waterproof, dust-proof, high temperature resistance, chemical corrosion resistance, excellent flame retardant and electrical insulation properties
  • the power battery explosion-proof valve with the explosion-proof membrane has no thorns
  • the explosion-proof membrane can achieve the effect of controllable blasting, which effectively suppresses the explosion of the battery pack or the internal pressure of the battery box due to the failure of the battery cell, and avoids the danger of personal injury.
  • Figure 1 is a schematic structural view of a preferred embodiment of the non-breathable explosion-proof membrane of the present invention
  • Fig. 2 is a schematic structural diagram of a preferred embodiment of an explosion-proof valve for a power battery of the present invention.
  • the embodiment of the present invention includes:
  • a non-breathable explosion-proof membrane 3 includes: a non-breathable explosion-proof membrane 2 and an oil- and water-repellent functional coating 1.
  • the surface of the non-breathable explosion-proof membrane is provided with an oil- and water-repellent functional coating.
  • the non-air-permeable explosion-proof membrane 3 controls the thickness of the air-permeable explosion-proof membrane 2 to be 10 ⁇ m and the mechanical strength to 15 MPa, and precisely controls the critical value of the burst pressure to 25 kPa.
  • the present invention also relates to the preparation process of the non-air-permeable explosion-proof film 2: adopting polytetrafluoroethylene (PTFE) suspension resin or/and modifier to form a blank, sintering in a sintering furnace at a high temperature of 385°C and then cooling into a rod, and then The non-air-permeable explosion-proof film 2 with a thickness of 10 ⁇ m is made through a turning process and a calendering process.
  • PTFE polytetrafluoroethylene
  • the surface of the non-breathable explosion-proof membrane 2 is activated, and the surface of the explosion-proof membrane 2 is re-coated to achieve the oil and water repellent function.
  • the oil-proof grade of the non-breathable explosion-proof membrane 3 reaches 6 or higher.
  • the thickness of the semi-oriented or oriented film is controlled to 10 ⁇ m and the strength is 15 MPa by adjusting the calendering process hot roll gap to 10 ⁇ m, temperature to 360° C., and pressure to 10 MPa to further increase the crystallinity.
  • the calendering process hot roll gap to 10 ⁇ m
  • temperature to 360° C. temperature to 360° C.
  • pressure to 10 MPa to further increase the crystallinity.
  • After molecular chain orientation The orientation is tightly arranged, the film is dense and airtight, and the tensile strength is improved.
  • the non-breathable explosion-proof membrane 3 has high temperature resistance, chemical corrosion resistance and excellent electrical insulation performance.
  • the non-breathable explosion-proof membrane 3 has excellent flame-retardant performance and reaches the UL94 V-0 rating.
  • the present invention also relates to a power battery explosion-proof valve.
  • the non-breathable explosion-proof membrane 3 is welded on the annular rib 4 of the explosion-proof valve 5 by ultrasonic welding or hot melt welding, so that the non-breathable explosion-proof membrane 3 is firmly Welded on the explosion-proof valve 5.
  • the non-air-permeable explosion-proof film 3 will gradually expand to the outside due to the force on the inside, and when it reaches the expected set pressure critical value of 25kPa, that is, the tensile strength of the film at maximum deformation is less than the internal pressure strength At this time, the non-breathable explosion-proof film 3 will break and burst along the direction perpendicular to the stretch orientation of the film, quickly releasing the internal pressure of the battery pack or battery box.
  • a non-breathable explosion-proof membrane 3 includes: a non-breathable explosion-proof membrane 2 and a surface oil- and water-repellent functional coating 1.
  • the non-air-permeable explosion-proof film 3 controls the thickness of the non-air-permeable explosion-proof film 2 to 12 ⁇ m and the mechanical strength to 20 MPa, and precisely controls the critical value of the burst pressure to 30 kPa.
  • the present invention also relates to the preparation process of the non-air-permeable explosion-proof film 2: using polytetrafluoroethylene (PTFE) suspension resin or/and modifiers to be molded into a blank, sintered in a sintering furnace at a high temperature of 395°C and then cooled into a rod, and then The non-air-permeable anti-explosive film 2 with a thickness of 12 ⁇ m is made through a turning process and a calendering process.
  • PTFE polytetrafluoroethylene
  • the surface of the non-breathable explosion-proof membrane 2 is activated, and the surface of the explosion-proof membrane 2 is coated to achieve the oil and water repellent function.
  • the oil-proof grade of the non-breathable explosion-proof membrane 3 reaches 6 or higher.
  • the thickness of the semi-oriented or oriented film is controlled to 12 ⁇ m and the strength to 20 MPa by adjusting the calendering process hot roll gap to 12 ⁇ m, temperature to 370° C., and pressure to 15 MPa to further increase its crystallinity. After molecular chain orientation The orientation is tightly arranged, the film is dense and airtight, and the tensile strength is improved.
  • the non-breathable explosion-proof membrane 3 has high temperature resistance, chemical corrosion resistance and excellent electrical insulation properties.
  • the non-breathable explosion-proof membrane 3 has excellent flame-retardant performance and reaches the UL94 V-0 rating.
  • the present invention also relates to an explosion-proof valve for power batteries.
  • the non-breathable explosion-proof membrane 3 is welded on the annular rib 4 of the explosion-proof valve body 5 by an ultrasonic welding process or a hot melt welding process, so that the non-breathable explosion-proof membrane 3 is firmly welded on On the explosion-proof valve body 5.
  • the non-breathable explosion-proof film 3 will gradually expand to the outside due to the force on the inside, and when it reaches the expected set pressure threshold, 30kPa, that is, the tensile strength of the film at maximum deformation is less than the internal pressure strength At this time, the non-breathable explosion-proof film 3 will break and burst along the direction perpendicular to the stretch orientation of the film, quickly releasing the internal pressure of the battery pack or battery box.
  • the expected set pressure threshold 30kPa
  • a non-breathable explosion-proof membrane 3 includes: a non-breathable explosion-proof membrane 2 and an oil- and water-repellent functional coating 1.
  • the surface of the non-breathable explosion-proof membrane is provided with an oil- and water-repellent functional coating.
  • the non-air-permeable explosion-proof membrane 3 controls the thickness of the non-air-permeable explosion-proof membrane 2 to 30 ⁇ m and the mechanical strength to 25 MPa, and precisely controls the critical value of the burst pressure to 35 kPa.
  • the present invention also relates to the preparation process of the non-air-permeable explosion-proof film 2: adopting polytetrafluoroethylene (PTFE) suspension resin or/and modifier to form a blank, sintering in a sintering furnace at a high temperature of 385°C and then cooling into a rod, and then The non-air-permeable explosion-proof film 2 with a thickness of 30 ⁇ m is made through a turning process and a calendering process.
  • PTFE polytetrafluoroethylene
  • the surface of the non-breathable explosion-proof membrane 2 is activated, and the surface of the explosion-proof membrane 2 is re-coated to achieve the oil and water repellent function.
  • the oil-proof grade of the non-breathable explosion-proof membrane 3 reaches 6 or higher.
  • the thickness of the semi-oriented or oriented film is controlled to be 30 ⁇ m and the strength is 25 MPa by adjusting the calendering process hot roll gap to 13 ⁇ m, temperature to 380° C., and pressure to 15 MPa to further increase the crystallinity. After molecular chain orientation The orientation is tightly arranged, the film is dense and airtight, and the tensile strength is improved.
  • the non-breathable explosion-proof membrane 3 has high temperature resistance, chemical corrosion resistance and excellent electrical insulation properties.
  • the non-breathable explosion-proof membrane 3 has excellent flame-retardant performance and reaches the UL94 V-0 rating.
  • the present invention also relates to a power battery explosion-proof valve.
  • the non-breathable explosion-proof membrane 3 is welded on the annular rib 4 of the explosion-proof valve 5 by ultrasonic welding or hot melt welding, so that the non-breathable explosion-proof membrane 3 is firmly Welded on the explosion-proof valve 5.
  • the non-air-permeable explosion-proof film 3 will gradually expand to the outside due to the force on the inside, and when it reaches the expected set pressure critical value of 35kPa, that is, the tensile strength of the film at maximum deformation is less than the internal pressure strength At this time, the non-air-permeable explosion-proof film 3 will break and burst along the direction perpendicular to the stretching orientation of the film, quickly releasing the internal pressure of the battery pack or battery box.
  • the non-breathable explosion-proof membrane of the present invention has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, excellent flame retardant and electrical insulation properties.
  • the power battery explosion-proof valve with the explosion-proof membrane has no puncture structure.
  • the explosion-proof membrane can achieve the effect of controllable blasting, effectively suppressing the explosion of the internal pressure of the battery pack or battery box due to the failure of the battery cell, and avoiding the danger of personal injury.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本发明公开了一种非透气型防爆膜、制备方法及动力电池防爆阀，非透气型防爆膜采用聚四氟乙烯悬浮树脂或聚四氟乙烯悬浮树脂和改性剂经模压成坯，在烧结炉中经385℃-400℃高温下烧结后冷却成棒，再经车削工艺、压延工艺制备成非透气型防爆薄膜；非透气型防爆膜采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀的环形棱筋上。通过上述方式，本发明非透气型防爆膜具有防油防水、防尘、耐高温、耐化学腐蚀、优异的阻燃和电气绝缘性能，具有防爆膜的动力电池防爆阀在没有刺破结构的情况下，使防爆膜能够达到可控爆破的效果，有效抑制了由于电池芯失效后，使电池包或电池箱内部压力急剧上升发生爆炸，避免造成对人员伤害的危险。

Description

一种非透气型防爆膜、制备方法及动力电池防爆阀 技术领域
本发明涉及一种非透气型防爆膜、制备方法及动力电池防爆阀。
背景技术
动力电池包主要采用防爆阀作为防爆装置，电池防爆阀体一般包括：本体、泄压口、刺破结构和防爆膜等结构。当电池芯失效，导致电池包温度过高，内部的气体发生膨胀，电池包的内部压力逐步增大，达到一定程度时防爆阀体中的刺破结构将防爆膜刺破，达到快速泄压的目的，防爆阀的存在提高了动力电池的安全性能。
目前动力电池防爆阀体中的防爆膜基本依赖于刺破结构实现爆破，并且动力电池防爆阀用防爆膜非透气型防爆膜有PE膜、PET膜、PP膜等，达不到长期防油防水、防尘、耐高温、耐化学腐蚀、阻燃和电气绝缘的目的。
技术问题
为了克服目前动力电池防爆阀体中的防爆膜的不足，本发明提供了一种非透气型防爆膜、制备方法及动力电池防爆阀。
问题的解决方案
技术解决方案
本发明主要解决的技术问题是提供一种非透气型防爆膜、制备方法及动力电池防爆阀，能够在没有刺破结构的情况下，使防爆膜能够达到可控爆破的效果；且防爆膜具有防油防水、防尘、耐高温、耐化学腐蚀、阻燃和电气绝缘的特性。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种非透气型防爆膜的制备方法，包括：采用聚四氟乙烯悬浮树脂或聚四氟乙烯悬浮树脂和改性剂经模压成坯，在烧结炉中经385℃-400℃高温下烧结后冷却成棒，再经车削工艺、压延工艺制备成非透气型防爆薄膜。
在本发明一个较佳实施例中，进一步对非透气型防爆膜表面经活化处理，再涂 布拒油拒水功能性涂层，制得具有拒油拒水功能的非透气型防爆薄膜。
在本发明一个较佳实施例中，该非透气型防爆膜防油等级达到6级以上。
在本发明一个较佳实施例中，所述压延工艺的热辊间隙为10-15μm、压延温度为350℃-380℃、压延压力为10-15MPa，用压延工艺参数来控制半定向或定向膜的厚度和强度，进一步地使其结晶度提高，分子链取向后定向紧密排列。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种非透气型防爆膜，其特征在于，用上述任一方法制备而成。
在本发明一个较佳实施例中，所述非透气型防爆膜厚度在5μm～50μm，拉伸强度≥10MPa。
在本发明一个较佳实施例中，所述非透气型防爆膜表面设有拒油拒水功能性涂层。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种动力电池防爆阀，包括权利要求所述的非透气型防爆膜，非透气型防爆膜采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀的环形棱筋上。
在本发明一个较佳实施例中，所述非透气型防爆膜由于内侧受力逐渐向外侧膨胀鼓起，当达到预期设定的压力临界值时，即膜的最大形变时的抗拉强度小于内部压力强度，非透气型防爆膜会沿着垂直于膜的拉伸取向方向断裂爆破，快速释放电池包或电池箱内部压力。
在本发明一个较佳实施例中，所述压力临界值为20-35kPa。
发明的有益效果
有益效果
本发明的有益效果是：本发明的非透气型防爆膜具有防油防水、防尘、耐高温、耐化学腐蚀、优异的阻燃和电气绝缘性能，具有防爆膜的动力电池防爆阀在没有刺破结构的情况下，使防爆膜能够达到可控爆破的效果，有效抑制了由于电池芯失效后，使电池包或电池箱内部压力急剧上升发生爆炸，避免造成对人员伤害的危险。
对附图的简要说明
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1是本发明非透气型防爆膜一较佳实施例的结构示意图；
图2是本发明动力电池防爆阀一较佳实施例的结构示意图。
发明实施例
本发明的实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请参阅图1和图2，本发明实施例包括：
实施例1：
一种非透气型防爆膜3，包括：非透气型防爆膜2和拒油拒水功能性涂层1，非透气型防爆膜表面设有拒油拒水功能性涂层。
实施例中，所述非透气型防爆薄膜3通过控制非透气型防爆膜2的厚度在10μm和机械强度15MPa，精准控制爆破压力临界值为25kPa。
本发明还涉及非透气型防爆薄膜2制备工艺：采用聚四氟乙烯(PTFE)悬浮树脂或/和改性剂经模压成坯，在烧结炉中经385℃高温下烧结后冷却成棒，再经车削工艺、压延工艺而制成10μm的非透气型防爆薄膜2。
实施例中，所述非透气型防爆膜2表面经活化处理，防爆膜2表面再涂层达到拒油拒水功能。
实施例中，所述非透气型防爆膜3防油等级达到6级以上。
实施例中，通过调节压延工艺热辊间隙为10μm、温度为360℃、压力为10MPa来控制半定向或定向膜的厚度为10μm和强度为15MPa，进一步地使其结晶度提高，分子链取向后定向紧密排列，薄膜致密不透气，拉伸强度提高。
实施例中，所述的非透气型防爆膜3具有耐高温、耐化学腐蚀和优异的电气绝 缘性能。
实施例中，所述的非透气型防爆膜3具有优异的阻燃性能，达到UL94 V-0等级。
本发明还涉及一种动力电池防爆阀，所述的非透气型防爆膜3采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀5的环形棱筋4上，使非透气型防爆膜3牢固地焊接在防爆阀5上。
实施例中，所述非透气型防爆薄膜3会由于内侧受力逐渐向外侧膨胀鼓起，当达到预期设定的压力临界值25kPa时，即薄膜的最大形变时的抗拉强度小于内部压力强度时，非透气型防爆薄膜3会沿着垂直于薄膜的拉伸取向方向断裂爆破，快速释放电池包或电池箱内部压力。
实施例2：
一种非透气型防爆膜3，包括：非透气型防爆膜2和表面拒油拒水功能性涂层1。
实施例中，所述非透气型防爆薄膜3通过控制非透气型防爆膜2的厚度在12μm和机械强度20MPa，精准控制爆破压力临界值为30kPa。
本发明还涉及非透气型防爆薄膜2制备工艺：采用聚四氟乙烯(PTFE)悬浮树脂或/和改性剂经模压成坯，在烧结炉中经395℃高温下烧结后冷却成棒，再经车削工艺、压延工艺而制成12μm的非透气型防爆薄膜2。
实施例中，所述非透气型防爆膜2表面活化处理，防爆膜2表面再经涂层达到拒油拒水功能。
实施例中，所述非透气型防爆膜3防油等级达到6级以上。
实施例中，通过调节压延工艺热辊间隙为12μm、温度为370℃、压力为15MPa来控制半定向或定向膜的厚度为12μm和强度为20MPa，进一步地使其结晶度提高，分子链取向后定向紧密排列，薄膜致密不透气，拉伸强度提高。
实施例中，所述的非透气型防爆膜3具有耐高温、耐化学腐蚀和优异的电气绝缘性能。
实施例中，所述的非透气型防爆膜3具有优异的阻燃性能，达到UL94 V-0等级。
本发明还涉及一种动力电池防爆阀，非透气型防爆膜3采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀体5的环形棱筋4上，使非透气型防爆膜3牢固地焊接在防爆阀体5上。
实施例中，所述非透气型防爆薄膜3会由于内侧受力逐渐向外侧膨胀鼓起，当达到预期设定的压力临界值时30kPa，即薄膜的最大形变时的抗拉强度小于内部压力强度时，非透气型防爆薄膜3会沿着垂直于薄膜的拉伸取向方向断裂爆破，快速释放电池包或电池箱内部压力。
实施例3：
一种非透气型防爆膜3，包括：非透气型防爆膜2和拒油拒水功能性涂层1，非透气型防爆膜表面设有拒油拒水功能性涂层。
实施例中，所述非透气型防爆薄膜3通过控制非透气型防爆膜2的厚度在30μm和机械强度25MPa，精准控制爆破压力临界值为35kPa。
本发明还涉及非透气型防爆薄膜2制备工艺：采用聚四氟乙烯(PTFE)悬浮树脂或/和改性剂经模压成坯，在烧结炉中经385℃高温下烧结后冷却成棒，再经车削工艺、压延工艺而制成30μm的非透气型防爆薄膜2。
实施例中，所述非透气型防爆膜2表面经活化处理，防爆膜2表面再涂层达到拒油拒水功能。
实施例中，所述非透气型防爆膜3防油等级达到6级以上。
实施例中，通过调节压延工艺热辊间隙为13μm、温度为380℃、压力为15MPa来控制半定向或定向膜的厚度为30μm和强度为25MPa，进一步地使其结晶度提高，分子链取向后定向紧密排列，薄膜致密不透气，拉伸强度提高。
实施例中，所述的非透气型防爆膜3具有耐高温、耐化学腐蚀和优异的电气绝缘性能。
实施例中，所述的非透气型防爆膜3具有优异的阻燃性能，达到UL94 V-0等级。
本发明还涉及一种动力电池防爆阀，所述的非透气型防爆膜3采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀5的环形棱筋4上，使非透气型防爆膜3牢固地焊接在防爆阀5上。
实施例中，所述非透气型防爆薄膜3会由于内侧受力逐渐向外侧膨胀鼓起，当达到预期设定的压力临界值35kPa时，即薄膜的最大形变时的抗拉强度小于内部压力强度时，非透气型防爆薄膜3会沿着垂直于薄膜的拉伸取向方向断裂爆破，快速释放电池包或电池箱内部压力。
本发明的非透气型防爆膜具有防油防水、防尘、耐高温、耐化学腐蚀、优异的阻燃和电气绝缘性能，具有防爆膜的动力电池防爆阀在没有刺破结构的情况下，使防爆膜能够达到可控爆破的效果，有效抑制了由于电池芯失效后，使电池包或电池箱内部压力急剧上升发生爆炸，避免造成对人员伤害的危险。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书内容所作的等效结构或等效流程变换，或直接或间接运用在其它相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种非透气型防爆膜的制备方法，其特征在于，包括：采用聚四氟乙烯悬浮树脂或聚四氟乙烯悬浮树脂和改性剂经模压成坯，在烧结炉中经385℃-400℃高温下烧结后冷却成棒，再经车削工艺、压延工艺制备成非透气型防爆薄膜。
  2. 根据权利要求1所述的非透气型防爆膜制备方法，其特征在于，进一步对非透气型防爆膜表面经活化处理，再涂布拒油拒水功能性涂层，制得具有拒油拒水功能的非透气型防爆薄膜。
  3. 根据权利要求2所述的非透气型防爆膜制备方法，其特征在于，该非透气型防爆膜防油等级达到6级以上。
  4. 根据权利要求1所述的非透气型防爆膜制备方法，其特征在于，所述压延工艺的热辊间隙为10-15μm、压延温度为350℃-380℃、压延压力为10-15MPa，用压延工艺参数来控制半定向或定向膜的厚度和强度，进一步地使其结晶度提高，分子链取向后定向紧密排列。
  5. 一种非透气型防爆膜，其特征在于，用权利要求1-4任一方法制备而成。
  6. 根据权利要求5所述的非透气型防爆膜，其特征在于，所述非透气型防爆膜厚度在5μm～50μm，拉伸强度≥10MPa。
  7. 根据权利要求5所述的非透气型防爆膜，其特征在于，所述非透气型防爆膜表面设有拒油拒水功能性涂层。
  8. 一种动力电池防爆阀，其特征在于，包括权利要求5所述的非透气型防爆膜，非透气型防爆膜采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀的环形棱筋上。
  9. 根据权利要求8所述的动力电池防爆阀，其特征在于，所述非透气型防爆膜由于内侧受力逐渐向外侧膨胀鼓起，当达到预期设定的压力临界值时，即膜的最大形变时的抗拉强度小于内部压力强度，非透气型防爆膜会沿着垂直于膜的拉伸取向方向断裂爆破，快 速释放电池包或电池箱内部压力。
  10. 根据权利要求8所述的动力电池防爆阀，其特征在于，所述压力临界值为20-35kPa。
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