WO2020215637A1 - Breathable explosion-proof membrane for power battery explosion-proof valve, and manufacturing method therefor - Google Patents

Breathable explosion-proof membrane for power battery explosion-proof valve, and manufacturing method therefor Download PDF

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Publication number
WO2020215637A1
WO2020215637A1 PCT/CN2019/113230 CN2019113230W WO2020215637A1 WO 2020215637 A1 WO2020215637 A1 WO 2020215637A1 CN 2019113230 W CN2019113230 W CN 2019113230W WO 2020215637 A1 WO2020215637 A1 WO 2020215637A1
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explosion
proof
membrane
breathable
proof membrane
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PCT/CN2019/113230
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French (fr)
Chinese (zh)
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张云
李炳健
陈宇峰
丁荣华
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江苏泛亚微透科技股份有限公司
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Publication of WO2020215637A1 publication Critical patent/WO2020215637A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/30—Polyalkenyl halides
    • B01D71/32—Polyalkenyl halides containing fluorine atoms
    • B01D71/36—Polytetrafluoroethene
    • 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
    • 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 breathable explosion-proof membrane for an explosion-proof valve of a power battery and a preparation method thereof.
  • 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 breathable explosion-proof membrane is expanded polytetrafluoroethylene (ePTFE), and the non-breathable explosion-proof membrane is PE film and PET membrane. , PP film, etc.
  • the present invention provides a breathable explosion-proof membrane for a power battery explosion-proof valve and a preparation method thereof.
  • the main technical problem to be solved by the present invention is to provide a breathable explosion-proof membrane for an explosion-proof valve of a power battery and a preparation method thereof, which can balance the internal and external pressures of the battery pack and realize that the explosion-proof membrane can achieve controllable blasting without puncturing the structure Effect.
  • a technical solution adopted by the present invention is to provide a breathable explosion-proof membrane for a power battery explosion-proof valve.
  • the explosion-proof membrane is a porous, waterproof and breathable polytetrafluoroethylene PTFE membrane with a structure of each micron level.
  • the surface of the polytetrafluoroethylene suspended resin microspheres is melted and connected to each other to form a microporous membrane with multiple air-permeable channels.
  • the air permeability can be adjusted by controlling the pore size and porosity of the explosion-proof membrane to achieve the purpose of balancing the internal and external pressure of the battery pack.
  • the breathable explosion-proof membrane is welded on the annular rib of the explosion-proof valve body by an ultrasonic welding process or a hot-melt welding process.
  • the explosion-proof valve body when the battery core heats up, the internal gas of the battery pack expands, and the internal pressure of the explosion-proof valve body will be discharged to the outside through the micropores of the explosion-proof membrane to maintain the balance of the internal and external pressure of the battery pack;
  • the pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane will burst to quickly release the internal pressure of the battery pack.
  • the particle size of the polytetrafluoroethylene suspension resin is 1-10 ⁇ m.
  • the pore size of the breathable explosion-proof membrane is 0.3-20 ⁇ m, and the porosity is ⁇ 90%.
  • the air permeability of the breathable explosion-proof membrane is ⁇ 200ml/min/cm2@1kPa, and the water pressure resistance is ⁇ 15kPa.
  • the breathable explosion-proof membrane has excellent flame-retardant performance, reaching UL94 V-0.
  • the present invention also relates to a method for preparing a gas-permeable explosion-proof membrane for a power battery explosion-proof valve, which comprises: mixing a porous waterproof and breathable polytetrafluoroethylene PTFE membrane through a modified polytetrafluoroethylene suspension resin or/and a pore former, It is made by pressing into a blank, sintering process, cooling, and then rewinding by turning process.
  • the pore-forming agent is preferably one or more of sodium bicarbonate, ammonium bicarbonate, ammonium chloride and alkane oil, and the added content is in the PTFE suspension powder base material. 1wt% ⁇ 10wt%.
  • the method for preparing the breathable explosion-proof membrane further includes adjusting the pore size of the membrane by controlling the molding pressure, sintering temperature and time.
  • the beneficial effect of the present invention is that the present invention adjusts the air permeability by controlling the pore size and porosity of the explosion-proof membrane, so as to achieve the purpose of balancing the internal and external pressure of the battery pack.
  • the internal gas in the battery pack expands, and the internal pressure will be discharged to the outside through the micropores of the explosion-proof membrane to maintain the balance of pressure inside and outside the battery pack; when the internal and external pressure difference is greater than the burst pressure critical value, the explosion-proof membrane will be implemented Blasting quickly releases the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
  • Fig. 1 is a scanning electron microscope (SEM) of a preferred embodiment of a breathable explosion-proof membrane for a power battery explosion-proof valve according to the present invention
  • FIG. 2 is a schematic diagram of the structure of the breathable explosion-proof membrane for the explosion-proof valve of the power battery in the explosion-proof valve body of the present invention.
  • the embodiment of the present invention includes:
  • a breathable explosion-proof membrane 4 for a power battery explosion-proof valve is a new type of porous waterproof and breathable polytetrafluoroethylene (PTFE) membrane.
  • PTFE polytetrafluoroethylene
  • the new type of porous waterproof and breathable PTFE membrane structure the surface of each micron-sized PTFE suspended resin microsphere 1 is melted and connected to each other, and accumulated into a microporous membrane 4 with multiple air-permeable pores 2.
  • the size and porosity are used to adjust the air permeability to achieve the purpose of balancing the pressure inside and outside the battery pack.
  • the principle of the gas-permeable explosion-proof membrane 4 is: when the battery cell heats up, the internal gas of the battery pack expands, and the internal pressure will be discharged to the outside through the micropores 3 of the explosion-proof membrane 4 to maintain the balance of the pressure inside and outside the battery pack; When the internal and external pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane 4 will be blasted to quickly release the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
  • the breathable explosion-proof membrane 4 is welded to the annular rib 5 of the explosion-proof valve body 6 by using an ultrasonic welding process or a hot melt welding process.
  • the particle size of the PTFE suspension resin 1 is 5 ⁇ m.
  • the pore size of the breathable explosion-proof membrane 4 is 15 ⁇ m, and the porosity is 92%.
  • the air permeability of the breathable explosion-proof membrane 4 is 300ml/min/cm2@1kPa, and the water pressure resistance is 15kPa.
  • the breathable explosion-proof membrane 4 has excellent flame-retardant performance, reaching the UL94 V-0 level.
  • a method for preparing a breathable explosion-proof membrane for a power battery explosion-proof valve includes: mixing the PTFE porous breathable membrane with a modified polytetrafluoroethylene suspension resin 1 or/and a pore-forming agent uniformly, forming a blank by molding, sintering, and cooling Then it is made by rewinding by turning process.
  • the pore forming agent is preferably one or more substances such as sodium bicarbonate, ammonium bicarbonate, ammonium chloride, alkane oil, etc., and the added content is 1wt%-10wt% of the PTFE suspension powder base material .
  • the method for preparing the gas-permeable explosion-proof membrane 4 controls the molding pressure to 20 mPa, the sintering temperature to 380° C., the sintering time to be 30 minutes, and the pore size of the membrane to be adjusted to 15 ⁇ m.
  • the air-permeable explosion-proof membrane 4 has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, and electrical insulation properties, and can be widely used in the field of power battery explosion-proof valves.
  • a breathable explosion-proof membrane 4 for a power battery explosion-proof valve is a new type of porous waterproof and breathable polytetrafluoroethylene (PTFE) membrane.
  • PTFE polytetrafluoroethylene
  • the new type of porous waterproof and breathable PTFE membrane structure The surface of each micron-level PTFE suspended resin microsphere 1 is melted and connected to each other, and accumulated into a microporous membrane 4 with multiple air-permeable channels 2.
  • the air permeability can be adjusted by controlling the pore size 2 and porosity of the explosion-proof membrane 4 to achieve a balanced battery pack The purpose of internal and external pressure.
  • the principle of the gas-permeable explosion-proof membrane 4 is: when the battery cell heats up, the internal gas of the battery pack expands, and the internal pressure will be discharged to the outside through the micropores 3 of the explosion-proof membrane 4 to maintain the balance of the pressure inside and outside the battery pack; When the internal and external pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane 4 will be blasted to quickly release the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
  • the breathable explosion-proof membrane 4 is welded to the annular rib 5 of the explosion-proof valve body 6 by using an ultrasonic welding process or a hot melt welding process.
  • the particle size of the PTFE suspension resin 1 is 3 ⁇ m.
  • the pore size of the breathable explosion-proof membrane 4 is 10 ⁇ m, and the porosity is 90%.
  • the air permeability of the breathable explosion-proof membrane 4 is 220ml/min/cm2@1kPa, and the water pressure resistance is 22kPa.
  • the breathable explosion-proof membrane 4 has excellent flame-retardant performance, reaching the UL94 V-0 level.
  • a method for preparing a gas-permeable explosion-proof membrane for a power battery explosion-proof valve includes: the PTFE porous gas-permeable membrane is uniformly mixed with a modified polytetrafluoroethylene suspension resin 1 or/and a pore-forming agent, and is molded into a blank, sintered, and cooled. It is made by rewinding by turning process.
  • the pore forming agent is preferably one or more substances such as sodium bicarbonate, ammonium bicarbonate, ammonium chloride, alkane oil, etc., and the added content is 1wt%-10wt% of the PTFE suspension powder base material .
  • the method for preparing the gas-permeable explosion-proof membrane 4 controls the molding pressure to 30 mPa, the sintering temperature to 385° C., and the sintering time to 35 minutes, and the pore size of the membrane is adjusted to 10 ⁇ m.
  • the air-permeable explosion-proof membrane 4 has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, and electrical insulation properties, and can be widely used in the field of power battery explosion-proof valves.
  • the breathable explosion-proof membrane 4 is a new type of porous waterproof and breathable polytetrafluoroethylene (PTFE) membrane.
  • the new type of porous waterproof and breathable PTFE membrane structure the surface of each micron-sized PTFE suspended resin microsphere 1 is melted and connected to each other, and accumulated into a microporous membrane 4 with multiple air-permeable pores 2.
  • the size and porosity are used to adjust the air permeability to achieve the purpose of balancing the pressure inside and outside the battery pack.
  • the principle of the gas-permeable explosion-proof membrane 4 is: when the battery cell heats up, the internal gas of the battery pack expands, and the internal pressure will be discharged to the outside through the micropores 3 of the explosion-proof membrane 4 to maintain the balance of the pressure inside and outside the battery pack; When the internal and external pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane 4 will be blasted to quickly release the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
  • the breathable explosion-proof membrane 4 is welded to the annular rib 5 of the explosion-proof valve body 6 by using an ultrasonic welding process or a hot melt welding process.
  • the particle size of the PTFE suspension resin 1 is 10 ⁇ m.
  • the pore size of the breathable explosion-proof membrane 4 is 17 ⁇ m, and the porosity is 94%.
  • the air permeability of the breathable explosion-proof membrane 4 is 350ml/min/cm2@1kPa, and the water pressure resistance is 25kPa.
  • the breathable explosion-proof membrane 4 has excellent flame-retardant performance, reaching the UL94 V-0 level.
  • a method for preparing a breathable explosion-proof membrane for a power battery explosion-proof valve includes: mixing the PTFE porous breathable membrane with a modified polytetrafluoroethylene suspension resin 1 or/and a pore-forming agent uniformly, forming a blank by molding, sintering, and cooling Then it is made by rewinding by turning process.
  • the pore forming agent is preferably one or more substances such as sodium bicarbonate, ammonium bicarbonate, ammonium chloride, alkane oil, etc., and the added content is 1wt%-10wt% of the PTFE suspension powder base material .
  • the method for preparing the gas-permeable explosion-proof membrane 4 controls the molding pressure to 20 mPa, the sintering temperature to 380° C., the sintering time to be 30 minutes, and the pore size of the membrane to be adjusted to 15 ⁇ m.
  • the air-permeable explosion-proof membrane 4 has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, and electrical insulation properties, and can be widely used in the field of power battery explosion-proof valves.
  • the gas-permeable explosion-proof membrane for a power battery explosion-proof valve and the preparation method thereof have the beneficial effects of adjusting the air permeability by controlling the pore size and porosity of the explosion-proof membrane to achieve the purpose of balancing the internal and external pressure of the battery pack.
  • the internal gas in the battery pack expands, and the internal pressure will be discharged to the outside through the micropores of the explosion-proof membrane to maintain the balance of pressure inside and outside the battery pack; when the internal and external pressure difference is greater than the burst pressure critical value, the explosion-proof membrane will be implemented Blasting quickly releases the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

A breathable explosion-proof membrane (4) for a power battery explosion-proof valve, and a manufacturing method therefor. The explosion-proof membrane (4) is a porous waterproof breathable polytetrafluoroethylene (PTFE) membrane, having a structure that the surface of each micron-sized polytetrafluoroethylene suspension resin microsphere is melted and connected to one another to be stacked into a microporous membrane having multiple air-permeable ducts (2). The air permeability is adjusted by controlling the pore size and the porosity of the explosion-proof membrane (4), so that the purpose of balancing the internal and external pressure of a battery pack is achieved. The manufacturing method for the breathable explosion-proof membrane (4) for a power battery explosion-proof valve comprises: manufacturing the porous waterproof breathable polytetrafluoroethylene (PTFE) membrane by evenly mixing a modified polytetrafluoroethylene suspension resin or/and a pore-forming agent, subjecting the mixture to molding into a blank, a sintering process, and cooling, and then subjecting to a turning process for winding. Based on the process above, the internal pressure and the external pressure of the battery pack can be balanced, and the explosion-proof membrane can achieve a controllable explosion effect under the condition that a puncture structure does not exist.

Description

一种动力电池防爆阀用透气型防爆膜及其制备方法Breathable explosion-proof membrane for explosion-proof valve of power battery and preparation method thereof 技术领域Technical field
本发明涉及一种动力电池防爆阀用透气型防爆膜及其制备方法。The invention relates to a breathable explosion-proof membrane for an explosion-proof valve of a power battery and a preparation method thereof.
背景技术Background technique
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防爆膜有透气型防爆膜和非透气型防爆膜两类，透气型防爆膜为膨体聚四氟乙烯膜(ePTFE)，非透气型防爆膜为PE膜、PET膜、PP膜等。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. 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 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. At present, there are two types of explosion-proof membranes in the explosion-proof valve body of power batteries: breathable explosion-proof membranes and non-breathable explosion-proof membranes. The breathable explosion-proof membrane is expanded polytetrafluoroethylene (ePTFE), and the non-breathable explosion-proof membrane is PE film and PET membrane. , PP film, etc.
技术问题technical problem
为了克服现有的防爆膜及其制备方法的不足，本发明提供一种动力电池防爆阀用透气型防爆膜及其制备方法。In order to overcome the shortcomings of the existing explosion-proof membrane and its preparation method, the present invention provides a breathable explosion-proof membrane for a power battery explosion-proof valve and a preparation method thereof.
问题的解决方案The solution to the problem
技术解决方案Technical solutions
本发明主要解决的技术问题是提供一种动力电池防爆阀用透气型防爆膜及其制备方法，能够平衡电池包内外压力，实现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。The main technical problem to be solved by the present invention is to provide a breathable explosion-proof membrane for an explosion-proof valve of a power battery and a preparation method thereof, which can balance the internal and external pressures of the battery pack and realize that the explosion-proof membrane can achieve controllable blasting without puncturing the structure Effect.
为解决上述技术问题，本发明采用的一个技术方案是：提供一种动力电池防爆阀用透气型防爆膜，该防爆膜为多孔防水透气聚四氟乙烯PTFE膜，其结构是用每个微米级聚四氟乙烯悬浮树脂微球表面熔融相互连接，堆积成具有多透气孔道的微孔膜，通过控制防爆膜的孔径大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a breathable explosion-proof membrane for a power battery explosion-proof valve. The explosion-proof membrane is a porous, waterproof and breathable polytetrafluoroethylene PTFE membrane with a structure of each micron level. The surface of the polytetrafluoroethylene suspended resin microspheres is melted and connected to each other to form a microporous membrane with multiple air-permeable channels. The air permeability can be adjusted by controlling the pore size and porosity of the explosion-proof membrane to achieve the purpose of balancing the internal and external pressure of the battery pack.
在本发明一个较佳实施例中，所述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体的环形棱筋上。In a preferred embodiment of the present invention, the breathable explosion-proof membrane is welded on the annular rib of the explosion-proof valve body by an ultrasonic welding process or a hot-melt welding process.
在本发明一个较佳实施例中，当电池芯升温，电池包的内部气体膨胀，防爆阀体内部压力会通过防爆膜的微孔向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜将实施爆破，快速释放电池包的内部压力。In a preferred embodiment of the present invention, when the battery core heats up, the internal gas of the battery pack expands, and the internal pressure of the explosion-proof valve body will be discharged to the outside through the micropores of the explosion-proof membrane to maintain the balance of the internal and external pressure of the battery pack; When the pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane will burst to quickly release the internal pressure of the battery pack.
在本发明一个较佳实施例中，所述聚四氟乙烯悬浮树脂粒径为1～10μm。In a preferred embodiment of the present invention, the particle size of the polytetrafluoroethylene suspension resin is 1-10 μm.
在本发明一个较佳实施例中，所述透气型防爆膜孔径大小为0.3～20μm，孔隙率≥90％。In a preferred embodiment of the present invention, the pore size of the breathable explosion-proof membrane is 0.3-20 μm, and the porosity is ≥90%.
在本发明一个较佳实施例中，所述透气型防爆膜透气量≥200ml/min/cm2@1kPa，耐水压≥15kPa。In a preferred embodiment of the present invention, the air permeability of the breathable explosion-proof membrane is ≥200ml/min/cm2@1kPa, and the water pressure resistance is ≥15kPa.
在本发明一个较佳实施例中，所述透气型防爆膜具有优异的阻燃性能，达到UL94 V-0等级。In a preferred embodiment of the present invention, the breathable explosion-proof membrane has excellent flame-retardant performance, reaching UL94 V-0.
在本发明还涉及一种动力电池防爆阀用透气型防爆膜的制备方法，包括：将多孔防水透气聚四氟乙烯PTFE膜通过改性聚四氟乙烯悬浮树脂或/和成孔剂混和均匀，经模压成坯、烧结工艺、冷却后再经车削工艺收卷而制成。The present invention also relates to a method for preparing a gas-permeable explosion-proof membrane for a power battery explosion-proof valve, which comprises: mixing a porous waterproof and breathable polytetrafluoroethylene PTFE membrane through a modified polytetrafluoroethylene suspension resin or/and a pore former, It is made by pressing into a blank, sintering process, cooling, and then rewinding by turning process.
在本发明一个较佳实施例中，所述的成孔剂优选地为碳酸氢钠、碳酸氢铵、氯化铵和烷烃油一种或多种物质，添加含量在PTFE悬浮粉体基料的1wt％～10wt％。In a preferred embodiment of the present invention, the pore-forming agent is preferably one or more of sodium bicarbonate, ammonium bicarbonate, ammonium chloride and alkane oil, and the added content is in the PTFE suspension powder base material. 1wt%～10wt%.
在本发明一个较佳实施例中，所述的透气型防爆膜制备方法还包括通过控制模压压力、烧结温度和时间来调节膜的微孔孔径大小。In a preferred embodiment of the present invention, the method for preparing the breathable explosion-proof membrane further includes adjusting the pore size of the membrane by controlling the molding pressure, sintering temperature and time.
发明的有益效果The beneficial effects of the invention
有益效果Beneficial effect
本发明的有益效果是：本发明通过控制防爆膜的孔径大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。当电池芯升温，电池包的内部气体膨胀，内部压力会通过防爆膜的微孔向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜将实施爆破，快速释放电池包的内部压力，从而保证电池包的安全，避免造成对人员伤害的危险。The beneficial effect of the present invention is that the present invention adjusts the air permeability by controlling the pore size and porosity of the explosion-proof membrane, so as to achieve the purpose of balancing the internal and external pressure of the battery pack. When the battery cell heats up, the internal gas in the battery pack expands, and the internal pressure will be discharged to the outside through the micropores of the explosion-proof membrane to maintain the balance of pressure inside and outside the battery pack; when the internal and external pressure difference is greater than the burst pressure critical value, the explosion-proof membrane will be implemented Blasting quickly releases the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
对附图的简要说明Brief description of the drawings
附图说明Description of the drawings
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：In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:
图1是本发明动力电池防爆阀用透气型防爆膜一较佳实施例的微观结构扫描电镜图(SEM)；Fig. 1 is a scanning electron microscope (SEM) of a preferred embodiment of a breathable explosion-proof membrane for a power battery explosion-proof valve according to the present invention;
图2是本发明动力电池防爆阀用透气型防爆膜在防爆阀体中的结构示意图。2 is a schematic diagram of the structure of the breathable explosion-proof membrane for the explosion-proof valve of the power battery in the explosion-proof valve body of the present invention.
发明实施例Invention embodiment
本发明的实施方式Embodiments of the invention
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。The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
请参阅图1和图2，本发明实施例包括：Please refer to Fig. 1 and Fig. 2, the embodiment of the present invention includes:
实施例1：Example 1:
一种动力电池防爆阀用透气型防爆膜4，所述透气型防爆膜4为一种新型多孔防水透气聚四氟乙烯(PTFE)膜。A breathable explosion-proof membrane 4 for a power battery explosion-proof valve. The breathable explosion-proof membrane 4 is a new type of porous waterproof and breathable polytetrafluoroethylene (PTFE) membrane.
实施例中，所述的新型多孔防水透气PTFE膜结构：每个微米级PTFE悬浮树脂微球1表面熔融相互连接，堆积成具有多透气孔道2的微孔膜4，通过控制防爆膜4的孔径2大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。In the embodiment, the new type of porous waterproof and breathable PTFE membrane structure: the surface of each micron-sized PTFE suspended resin microsphere 1 is melted and connected to each other, and accumulated into a microporous membrane 4 with multiple air-permeable pores 2. By controlling the pore size of the explosion-proof membrane 4 2 The size and porosity are used to adjust the air permeability to achieve the purpose of balancing the pressure inside and outside the battery pack.
实施例中，所述透气型防爆膜4原理：当电池芯升温，电池包的内部气体膨胀，内部压力会通过防爆膜4的微孔3向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜4将实施爆破，快速释放电池包的内部压力，从而保证电池包的安全，避免造成对人员伤害的危险。In the embodiment, the principle of the gas-permeable explosion-proof membrane 4 is: when the battery cell heats up, the internal gas of the battery pack expands, and the internal pressure will be discharged to the outside through the micropores 3 of the explosion-proof membrane 4 to maintain the balance of the pressure inside and outside the battery pack; When the internal and external pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane 4 will be blasted to quickly release the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
实施例中，所述透气型防爆膜4采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀体6的环形棱筋5上。In an embodiment, the breathable explosion-proof membrane 4 is welded to the annular rib 5 of the explosion-proof valve body 6 by using an ultrasonic welding process or a hot melt welding process.
实施例中，所述PTFE悬浮树脂1粒径为5μm。In an embodiment, the particle size of the PTFE suspension resin 1 is 5 μm.
实施例中，所述透气型防爆膜4孔径大小为15μm，孔隙率为92％。In an embodiment, the pore size of the breathable explosion-proof membrane 4 is 15 μm, and the porosity is 92%.
实施例中，所述透气型防爆膜4透气量为300ml/min/cm2@1kPa，耐水压为15kPa。In an embodiment, the air permeability of the breathable explosion-proof membrane 4 is 300ml/min/cm2@1kPa, and the water pressure resistance is 15kPa.
实施例中，所述透气型防爆膜4具有优异的阻燃性能，达到UL94 V-0等级。In the embodiment, the breathable explosion-proof membrane 4 has excellent flame-retardant performance, reaching the UL94 V-0 level.
一种动力电池防爆阀用透气型防爆膜其制备方法：包括，将PTFE多孔透气膜通过改性聚四氟乙烯悬浮树脂1或/和成孔剂混和均匀，经模压成坯、烧结工艺、冷却后再经车削工艺收卷而制成。A method for preparing a breathable explosion-proof membrane for a power battery explosion-proof valve includes: mixing the PTFE porous breathable membrane with a modified polytetrafluoroethylene suspension resin 1 or/and a pore-forming agent uniformly, forming a blank by molding, sintering, and cooling Then it is made by rewinding by turning process.
实施例中，所述的成孔剂优选地为碳酸氢钠、碳酸氢铵、氯化铵、烷烃油等一种或多种物质，添加含量在PTFE悬浮粉体基料的1wt％～10wt％。In the embodiment, the pore forming agent is preferably one or more substances such as sodium bicarbonate, ammonium bicarbonate, ammonium chloride, alkane oil, etc., and the added content is 1wt%-10wt% of the PTFE suspension powder base material .
实施例中，所述的透气型防爆膜4制备方法，控制模压压力为20mPa、烧结温度为380℃、烧结时间为30min，调节膜的微孔孔径大小为15μm。In the embodiment, the method for preparing the gas-permeable explosion-proof membrane 4 controls the molding pressure to 20 mPa, the sintering temperature to 380° C., the sintering time to be 30 minutes, and the pore size of the membrane to be adjusted to 15 μm.
实施例中，所述透气型防爆膜4具有防油防水、防尘、耐高温、耐化学腐蚀和电气绝缘性能，可广泛应用于动力电池防爆阀领域。In the embodiment, the air-permeable explosion-proof membrane 4 has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, and electrical insulation properties, and can be widely used in the field of power battery explosion-proof valves.
实施例2：Example 2:
一种动力电池防爆阀用透气型防爆膜4，所述透气型防爆膜4为一种新型多孔防水透气聚四氟乙烯(PTFE)膜，实施例中，所述的新型多孔防水透气PTFE膜结构：每个微米级PTFE悬浮树脂微球1表面熔融相互连接，堆积成具有多透气孔道2的微孔膜4，通过控制防爆膜4的孔径2大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。A breathable explosion-proof membrane 4 for a power battery explosion-proof valve. The breathable explosion-proof membrane 4 is a new type of porous waterproof and breathable polytetrafluoroethylene (PTFE) membrane. In the embodiment, the new type of porous waterproof and breathable PTFE membrane structure ：The surface of each micron-level PTFE suspended resin microsphere 1 is melted and connected to each other, and accumulated into a microporous membrane 4 with multiple air-permeable channels 2. The air permeability can be adjusted by controlling the pore size 2 and porosity of the explosion-proof membrane 4 to achieve a balanced battery pack The purpose of internal and external pressure.
实施例中，所述透气型防爆膜4原理：当电池芯升温，电池包的内部气体膨胀，内部压力会通过防爆膜4的微孔3向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜4将实施爆破，快速释放电池包的内部压力，从而保证电池包的安全，避免造成对人员伤害的危险。In the embodiment, the principle of the gas-permeable explosion-proof membrane 4 is: when the battery cell heats up, the internal gas of the battery pack expands, and the internal pressure will be discharged to the outside through the micropores 3 of the explosion-proof membrane 4 to maintain the balance of the pressure inside and outside the battery pack; When the internal and external pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane 4 will be blasted to quickly release the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
实施例中，所述透气型防爆膜4采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀体6的环形棱筋5上。In an embodiment, the breathable explosion-proof membrane 4 is welded to the annular rib 5 of the explosion-proof valve body 6 by using an ultrasonic welding process or a hot melt welding process.
实施例中，所述PTFE悬浮树脂1粒径为3μm。In an embodiment, the particle size of the PTFE suspension resin 1 is 3 μm.
实施例中，所述透气型防爆膜4孔径大小为10μm，孔隙率为90％。In an embodiment, the pore size of the breathable explosion-proof membrane 4 is 10 μm, and the porosity is 90%.
实施例中，所述透气型防爆膜4透气量为220ml/min/cm2@1kPa，耐水压为22kPa。In an embodiment, the air permeability of the breathable explosion-proof membrane 4 is 220ml/min/cm2@1kPa, and the water pressure resistance is 22kPa.
实施例中，所述透气型防爆膜4具有优异的阻燃性能，达到UL94 V-0等级。In the embodiment, the breathable explosion-proof membrane 4 has excellent flame-retardant performance, reaching the UL94 V-0 level.
一种动力电池防爆阀用透气型防爆膜的制备方法，包括：PTFE多孔透气膜通过改性聚四氟乙烯悬浮树脂1或/和成孔剂混和均匀，经模压成坯、烧结工艺、冷却后再经车削工艺收卷而制成。A method for preparing a gas-permeable explosion-proof membrane for a power battery explosion-proof valve includes: the PTFE porous gas-permeable membrane is uniformly mixed with a modified polytetrafluoroethylene suspension resin 1 or/and a pore-forming agent, and is molded into a blank, sintered, and cooled. It is made by rewinding by turning process.
实施例中，所述的成孔剂优选地为碳酸氢钠、碳酸氢铵、氯化铵、烷烃油等一种或多种物质，添加含量在PTFE悬浮粉体基料的1wt％～10wt％。In the embodiment, the pore forming agent is preferably one or more substances such as sodium bicarbonate, ammonium bicarbonate, ammonium chloride, alkane oil, etc., and the added content is 1wt%-10wt% of the PTFE suspension powder base material .
实施例中，所述的透气型防爆膜4制备方法，控制模压压力为30mPa、烧结温度为385℃、烧结时间为35min，调节膜的微孔孔径大小为10μm。In the embodiment, the method for preparing the gas-permeable explosion-proof membrane 4 controls the molding pressure to 30 mPa, the sintering temperature to 385° C., and the sintering time to 35 minutes, and the pore size of the membrane is adjusted to 10 μm.
实施例中，所述透气型防爆膜4具有防油防水、防尘、耐高温、耐化学腐蚀和电气绝缘性能，可广泛应用于动力电池防爆阀领域。In the embodiment, the air-permeable explosion-proof membrane 4 has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, and electrical insulation properties, and can be widely used in the field of power battery explosion-proof valves.
实施例3：Example 3:
一种动力电池防爆阀用透气型防爆膜，所述透气型防爆膜4为一种新型多孔防水透气聚四氟乙烯(PTFE)膜。A breathable explosion-proof membrane for a power battery explosion-proof valve. The breathable explosion-proof membrane 4 is a new type of porous waterproof and breathable polytetrafluoroethylene (PTFE) membrane.
实施例中，所述的新型多孔防水透气PTFE膜结构：每个微米级PTFE悬浮树脂微球1表面熔融相互连接，堆积成具有多透气孔道2的微孔膜4，通过控制防爆膜4的孔径2大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。In the embodiment, the new type of porous waterproof and breathable PTFE membrane structure: the surface of each micron-sized PTFE suspended resin microsphere 1 is melted and connected to each other, and accumulated into a microporous membrane 4 with multiple air-permeable pores 2. By controlling the pore size of the explosion-proof membrane 4 2 The size and porosity are used to adjust the air permeability to achieve the purpose of balancing the pressure inside and outside the battery pack.
实施例中，所述透气型防爆膜4原理：当电池芯升温，电池包的内部气体膨胀，内部压力会通过防爆膜4的微孔3向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜4将实施爆破，快速释放电池包的内部压力，从而保证电池包的安全，避免造成对人员伤害的危险。In the embodiment, the principle of the gas-permeable explosion-proof membrane 4 is: when the battery cell heats up, the internal gas of the battery pack expands, and the internal pressure will be discharged to the outside through the micropores 3 of the explosion-proof membrane 4 to maintain the balance of the pressure inside and outside the battery pack; When the internal and external pressure difference is greater than the critical value of the burst pressure, the explosion-proof membrane 4 will be blasted to quickly release the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
实施例中，所述透气型防爆膜4采用超声波焊接工艺或热熔焊接工艺焊接在防爆阀体6的环形棱筋5上。In an embodiment, the breathable explosion-proof membrane 4 is welded to the annular rib 5 of the explosion-proof valve body 6 by using an ultrasonic welding process or a hot melt welding process.
实施例中，所述PTFE悬浮树脂1粒径为10μm。In an embodiment, the particle size of the PTFE suspension resin 1 is 10 μm.
实施例中，所述透气型防爆膜4孔径大小为17μm，孔隙率为94％。In an embodiment, the pore size of the breathable explosion-proof membrane 4 is 17 μm, and the porosity is 94%.
实施例中，所述透气型防爆膜4透气量为350ml/min/cm2@1kPa，耐水压为25kPa。In an embodiment, the air permeability of the breathable explosion-proof membrane 4 is 350ml/min/cm2@1kPa, and the water pressure resistance is 25kPa.
实施例中，所述透气型防爆膜4具有优异的阻燃性能，达到UL94 V-0等级。In the embodiment, the breathable explosion-proof membrane 4 has excellent flame-retardant performance, reaching the UL94 V-0 level.
一种动力电池防爆阀用透气型防爆膜其制备方法：包括，将PTFE多孔透气膜 通过改性聚四氟乙烯悬浮树脂1或/和成孔剂混和均匀，经模压成坯、烧结工艺、冷却后再经车削工艺收卷而制成。A method for preparing a breathable explosion-proof membrane for a power battery explosion-proof valve includes: mixing the PTFE porous breathable membrane with a modified polytetrafluoroethylene suspension resin 1 or/and a pore-forming agent uniformly, forming a blank by molding, sintering, and cooling Then it is made by rewinding by turning process.
实施例中，所述的成孔剂优选地为碳酸氢钠、碳酸氢铵、氯化铵、烷烃油等一种或多种物质，添加含量在PTFE悬浮粉体基料的1wt％～10wt％。In the embodiment, the pore forming agent is preferably one or more substances such as sodium bicarbonate, ammonium bicarbonate, ammonium chloride, alkane oil, etc., and the added content is 1wt%-10wt% of the PTFE suspension powder base material .
实施例中，所述的透气型防爆膜4制备方法，控制模压压力为20mPa、烧结温度为380℃、烧结时间为30min，调节膜的微孔孔径大小为15μm。In the embodiment, the method for preparing the gas-permeable explosion-proof membrane 4 controls the molding pressure to 20 mPa, the sintering temperature to 380° C., the sintering time to be 30 minutes, and the pore size of the membrane to be adjusted to 15 μm.
实施例中，所述透气型防爆膜4具有防油防水、防尘、耐高温、耐化学腐蚀和电气绝缘性能，可广泛应用于动力电池防爆阀领域。In the embodiment, the air-permeable explosion-proof membrane 4 has oil and water resistance, dustproof, high temperature resistance, chemical corrosion resistance, and electrical insulation properties, and can be widely used in the field of power battery explosion-proof valves.
本发明一种动力电池防爆阀用透气型防爆膜及其制备方法的有益效果是：通过控制防爆膜的孔径大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。当电池芯升温，电池包的内部气体膨胀，内部压力会通过防爆膜的微孔向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜将实施爆破，快速释放电池包的内部压力，从而保证电池包的安全，避免造成对人员伤害的危险。The gas-permeable explosion-proof membrane for a power battery explosion-proof valve and the preparation method thereof have the beneficial effects of adjusting the air permeability by controlling the pore size and porosity of the explosion-proof membrane to achieve the purpose of balancing the internal and external pressure of the battery pack. When the battery cell heats up, the internal gas in the battery pack expands, and the internal pressure will be discharged to the outside through the micropores of the explosion-proof membrane to maintain the balance of pressure inside and outside the battery pack; when the internal and external pressure difference is greater than the burst pressure critical value, the explosion-proof membrane will be implemented Blasting quickly releases the internal pressure of the battery pack, thereby ensuring the safety of the battery pack and avoiding the danger of personal injury.
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。The above are only the embodiments of the present invention and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the present invention description, or directly or indirectly applied to other related technical fields, are all The same reason is included in the scope of patent protection of the present invention.

Claims (10)

  1. 一种动力电池防爆阀用透气型防爆膜，其特征在于，该防爆膜为多孔防水透气聚四氟乙烯PTFE膜，其结构是用每个微米级聚四氟乙烯悬浮树脂微球表面熔融相互连接，堆积成具有多透气孔道的微孔膜，通过控制防爆膜的孔径大小和孔隙率来调节透气量，达到平衡电池包内外压力的目的。A breathable explosion-proof membrane for a power battery explosion-proof valve, which is characterized in that the explosion-proof membrane is a porous, waterproof and breathable polytetrafluoroethylene PTFE membrane, and its structure is that the surface of each micron-level polytetrafluoroethylene suspension resin microsphere is melted and connected to each other , Stacked into a microporous membrane with multiple air-permeable pores, the air permeability can be adjusted by controlling the pore size and porosity of the explosion-proof membrane to achieve the purpose of balancing the internal and external pressure of the battery pack.
  2. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜，其特征在于，所述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体的环形棱筋上。The breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, wherein the breathable explosion-proof membrane is welded to the annular rib of the explosion-proof valve body by an ultrasonic welding process or a hot melt welding process.
  3. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜，其特征在于，当电池芯升温，电池包的内部气体膨胀，防爆阀体内部压力会通过防爆膜的微孔向外部排出泄压，维持电池包内外压力的平衡；当内外压差大于爆破压力临界值时，防爆膜将实施爆破，快速释放电池包的内部压力。The breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, wherein when the battery core heats up, the internal gas of the battery pack expands, and the internal pressure of the explosion-proof valve body will be discharged to the outside through the micropores of the explosion-proof membrane. , To maintain the balance of the internal and external pressures of the battery pack; when the pressure difference between the inside and the outside is greater than the critical value of the burst pressure, the explosion-proof membrane will burst to release the internal pressure of the battery pack quickly.
  4. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜，其特征在于，所述聚四氟乙烯悬浮树脂粒径为1～10μm。The breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, wherein the particle size of the polytetrafluoroethylene suspension resin is 1-10 μm.
  5. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜，其特征在于，所述透气型防爆膜孔径大小为0.3～20μm，孔隙率≥90％。The breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, wherein the pore size of the breathable explosion-proof membrane is 0.3-20 μm, and the porosity is ≥90%.
  6. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜，其特征在于，所述透气型防爆膜透气量≥200ml/min/cm2@1kPa，耐水压≥15kPa。The breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, wherein the air permeability of the breathable explosion-proof membrane is ≥200ml/min/cm2@1kPa, and the water pressure is ≥15kPa.
  7. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜，其特征在于，所述透气型防爆膜具有优异的阻燃性能，达到UL94V-0等级。The breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, wherein the breathable explosion-proof membrane has excellent flame-retardant performance and reaches the UL94V-0 level.
  8. 根据权利要求1所述的动力电池防爆阀用透气型防爆膜的制备方法，其特征在于，包括：将多孔防水透气聚四氟乙烯PTFE膜通过改性聚四氟乙烯悬浮树脂或/和成孔剂混和均匀，经模压成坯、烧结工艺、冷却后再经车削工艺收卷而制成。The method for preparing a breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 1, characterized in that it comprises: passing a porous waterproof and breathable polytetrafluoroethylene PTFE membrane through a modified polytetrafluoroethylene suspension resin or/and forming holes The agent is uniformly mixed, and it is made into a blank by molding, sintering, cooling, and then rewinding by turning.
  9. 根据权利要求1-7任一所述的动力电池防爆阀用透气型防爆膜的制备方法，其特征在于，所述的成孔剂优选地为碳酸氢钠、碳酸氢铵、氯化铵和烷烃油一种或多种物质，添加含量在PTFE悬浮粉体基料的1wt％～10wt％。The method for preparing a gas-permeable explosion-proof membrane for a power battery explosion-proof valve according to any one of claims 1-7, wherein the pore-forming agent is preferably sodium bicarbonate, ammonium bicarbonate, ammonium chloride and alkane Oil one or more substances, the added content is 1wt%-10wt% of the PTFE suspension powder base material.
  10. 根据权利要求8所述的动力电池防爆阀用透气型防爆膜的制备方法，其特征在于，所述的透气型防爆膜制备方法还包括通过控制模压压力、烧结温度和时间来调节膜的微孔孔径大小。The method for preparing a breathable explosion-proof membrane for a power battery explosion-proof valve according to claim 8, wherein the preparation method of the breathable explosion-proof membrane further comprises adjusting the micropores of the membrane by controlling the molding pressure, sintering temperature and time. Aperture size.
PCT/CN2019/113230 2019-04-26 2019-10-25 Breathable explosion-proof membrane for power battery explosion-proof valve, and manufacturing method therefor WO2020215637A1 (en)

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CN115020907A (en) * 2022-06-03 2022-09-06 江苏天合储能有限公司 Battery explosion-proof valve and explosion-proof battery device applied by same
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