阅读说明：本技术 一种动力电池用除湿防爆绝缘阀体 (Dehumidification explosion-proof insulation valve body for power battery ) 是由 张云 丁荣华 王祺 李炳健 于哲 郭翔 钱丙 雷伟 花金旦 于 2021-06-21 设计创作，主要内容包括：本发明公开了一种动力电池用除湿防爆绝缘阀体,包括：主体,主体的空气流通的路径上并列设有吸湿组件和绝缘组件,所述吸湿组件包括填充吸湿剂的吸湿腔体和透气膜,透气膜设于吸湿腔体与外部连通的出口端,用于屏蔽主体内外空气的流通；绝缘组件包括防护盖板和绝缘复合薄膜,所述防护盖板装配于主体上的沉孔内,与主体密封连接,绝缘复合膜复合于防护盖板上方,用于等电位绝缘保护。通过上述方式,本发明采用高性能聚酰亚胺/含氟聚合物绝缘复合薄膜进行等电位绝缘保护,透气膜与吸湿剂的组合使用,有效解决动力电池内部热量及压力不能及时排放掉,很容易导致电池着火、爆炸等问题。(The invention discloses a dehumidification explosion-proof insulation valve body for a power battery, which comprises: the air-permeable moisture absorption device comprises a main body, wherein a moisture absorption assembly and an insulation assembly are arranged in parallel on an air circulation path of the main body, the moisture absorption assembly comprises a moisture absorption cavity filled with a moisture absorbent and a breathable film, and the breathable film is arranged at an outlet end of the moisture absorption cavity communicated with the outside and used for shielding the circulation of air inside and outside the main body; the insulating assembly comprises a protective cover plate and an insulating composite film, the protective cover plate is assembled in a counter bore on the main body and is in sealing connection with the main body, and the insulating composite film is compounded above the protective cover plate and is used for equipotential insulation protection. Through the mode, the high-performance polyimide/fluoropolymer insulation composite film is adopted for equipotential insulation protection, and the breathable film and the moisture absorbent are combined for use, so that the problems that the internal heat and pressure of the power battery cannot be discharged in time, the battery is easily ignited and explodes and the like are effectively solved.)

1. The utility model provides a power battery is with explosion-proof insulating valve body of dehumidification which characterized in that includes: the air-permeable moisture absorption device comprises a main body, wherein a moisture absorption assembly and an insulation assembly are arranged in parallel on an air circulation path of the main body, the moisture absorption assembly comprises a moisture absorption cavity filled with a moisture absorbent and a breathable film, and the breathable film is arranged at an outlet end of the moisture absorption cavity communicated with the outside and used for shielding the circulation of air inside and outside the main body; the insulating assembly comprises a protective cover plate and an insulating composite film, the protective cover plate is assembled in a counter bore on the main body and is in sealing connection with the main body, and the insulating composite film is compounded above the protective cover plate and is used for equipotential insulation protection.

2. The dehumidification explosion-proof insulation valve body for the power battery as recited in claim 1, wherein the insulation composite film comprises a polyimide insulation base layer and a fluoropolymer outer layer.

3. The dehumidification explosion-proof insulation valve body for the power battery as recited in claim 2, wherein the fluoropolymer outer layer comprises Polytetrafluoroethylene (PTFE), Polytetrafluoroethylene (PTFE)/tetrafluoroethylene-hexafluoropropylene copolymer (PTFE/FEP) composite, Polytetrafluoroethylene (PTFE)/perfluoropropyl perfluorovinyl ether (PFA) composite, Polytetrafluoroethylene (PTFE)/ethylene-tetrafluoroethylene copolymer (PTFE/ETFE) composite or Polytetrafluoroethylene (PTFE)/polyvinylidene fluoride (PTFE/PVDF) composite.

4. The dehumidification explosion-proof insulation valve body for the power battery as recited in claim 1, wherein the thickness of the insulation composite film is 10 μm to 200 μm.

5. The dehumidification explosion-proof insulation valve body for the power battery as recited in claim 1, wherein the insulation composite film has a voltage resistance of more than 180 kV/mm.

6. The dehumidification explosion-proof insulation valve body for the power battery as recited in claim 1, wherein the protective cover plate is a metal protective cover plate, and comprises an aluminum valve cover, an iron valve cover or a steel valve cover.

Technical Field

The invention relates to the technical field of power batteries, in particular to a dehumidification explosion-proof insulation valve body for a power battery.

Background

The power battery is a power source for providing power for the tool, and is a storage battery for providing power for electric vehicles, electric trains, electric bicycles, golf carts and the like. The general requirement of power battery's top cap structure satisfies the overcharge test, but the top cap of present safety design is satisfying under the circumstances of overcharge test, is difficult to the test requirement through the acupuncture project, and the leading cause is for through the overcharge project, adopts the explosion-proof valve of big pressure value to there is sufficient time to let the connection piece of short-circuit current fusing anodal post and naked electric core anodal ear department. However, due to the adoption of the explosion-proof valve with a large pressure value, a large amount of heat and pressure can be accumulated in the power battery during the acupuncture test, and the heat and the pressure are not discharged in time, so that the problem that the battery is ignited or even explodes is easily caused.

In summary, how to solve the problem that the top cover structure of the power battery is easy to catch fire, even explode and insulate during the needle test after the top cover structure meets the overcharge test has become a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The invention mainly solves the technical problem of providing a dehumidification explosion-proof insulation valve body for a power battery, which can effectively solve the problems that the heat and the pressure in the power battery cannot be discharged in time, and the battery is easy to catch fire and explode.

In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a power battery is with explosion-proof insulating valve body of dehumidification, includes: the air-permeable moisture absorption device comprises a main body, wherein a moisture absorption assembly and an insulation assembly are arranged in parallel on an air circulation path of the main body, the moisture absorption assembly comprises a moisture absorption cavity filled with a moisture absorbent and a breathable film, and the breathable film is arranged at an outlet end of the moisture absorption cavity communicated with the outside and used for shielding the circulation of air inside and outside the main body; the insulating assembly comprises a protective cover plate and an insulating composite film, the protective cover plate is assembled in a counter bore on the main body and is in sealing connection with the main body, and the insulating composite film is compounded above the protective cover plate and is used for equipotential insulation protection.

In a preferred embodiment of the present invention, the insulation composite film comprises a polyimide insulation base layer and a fluoropolymer outer layer.

In a preferred embodiment of the invention, the outer fluoropolymer layer comprises polytetrafluoroethylene PTFE, polytetrafluoroethylene/tetrafluoroethylene-hexafluoropropylene copolymer PTFE/FEP composite, polytetrafluoroethylene/perfluoropropyl perfluorovinyl ether-polytetrafluoroethylene copolymer PTFE/PFA composite, polytetrafluoroethylene/ethylene-tetrafluoroethylene copolymer PTFE/ETFE composite, or polytetrafluoroethylene/polyvinylidene fluoride PTFE/PVDF composite.

In a preferred embodiment of the present invention, the thickness of the insulating composite film is 10 μm to 200 μm.

In a preferred embodiment of the invention, the voltage strength of the insulating composite film is more than 180 kV/mm.

In a preferred embodiment of the present invention, the protective cover is a metal protective cover, including an aluminum valve cover, an iron valve cover or a steel valve cover.

The invention has the beneficial effects that: the dehumidification explosion-proof insulation valve body for the power battery adopts the high-performance polyimide/fluoropolymer insulation composite film for equipotential insulation protection, and the combination use of the breathable film and the moisture absorbent effectively solves the problems that the internal heat and pressure of the power battery cannot be discharged in time, so that the ignition and explosion of the battery are easily caused, and the like.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic structural diagram of a preferred embodiment of the dehumidification explosion-proof insulation valve body for a power battery of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "front" and "back" and the like indicate orientations and positional relationships based on orientations and positional relationships shown in the drawings or orientations and positional relationships where the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Referring to fig. 1, an embodiment of the present invention includes:

the utility model provides a power battery is with explosion-proof insulating valve body of dehumidification, includes: a main body 1, a moisture absorbing unit and an insulating unit are provided in parallel on a path of the main body 1 through which air flows.

The moisture absorption assembly comprises a moisture absorption cavity 2 filled with a moisture absorbent and a breathable film 3, and the breathable film 3 is arranged at an outlet end of the moisture absorption cavity 2 communicated with the outside and used for shielding the circulation of the air inside and outside the main body.

The breathable film 3 comprises expanded polytetrafluoroethylene ePTFE (expanded polytetrafluoroethylene ePTFE), polytetrafluoroethylene PTFE, polyether sulfone PES (polyether sulfone) and other materials, has waterproof capability, can effectively solve the problem of unbalanced internal and external pressure difference of the sealing element, and reduces the problem of condensation inside the sealing element; the pressure difference between the inside and the outside and the water vapor permeation are balanced, the service performance of the equipment can be effectively improved, and the service life of the equipment can be effectively prolonged.

The moisture absorbent includes silica gel, alumina, molecular sieve and other materials having strong affinity for moisture.

The combination use of ventilated membrane 3 and hygroscopic agent has effectively solved power battery's inside heat and pressure and can not discharge in time, leads to the battery to catch fire very easily, even explode the problem.

The insulating assembly comprises a protective cover plate 4 and an insulating composite film 5, the protective cover plate 4 is assembled in a counter bore on the main body and is in sealing connection with the main body, and the insulating composite film 5 is compounded above the protective cover plate 4 and used for equipotential insulating protection.

The protective cover plate 4 is a metal protective cover plate and comprises an aluminum valve cover, an iron valve cover or a steel valve cover.

The insulation composite film 5 includes a polyimide insulation base layer and a fluoropolymer outer layer.

Wherein the outer layer of the fluoropolymer comprises polytetrafluoroethylene PTFE, polytetrafluoroethylene/tetrafluoroethylene-hexafluoropropylene copolymer PTFE/FEP composite material, polytetrafluoroethylene/perfluoropropyl perfluorovinyl ether-polytetrafluoroethylene copolymer PTFE/PFA composite material, polytetrafluoroethylene/ethylene-tetrafluoroethylene copolymer PTFE/ETFE composite material or polytetrafluoroethylene/polyvinylidene fluoride PTFE/PVDF composite material.

The thickness of the insulating composite film is 10-200 μm. The insulating composite film has the voltage strength of more than 180kV/mm, low dielectric constant, low dielectric loss, high volume resistivity, excellent heat resistance, chemical resistance, weather resistance, dimensional stability and good bonding property, the flame retardant property reaches UL 94V-0, and the insulating composite film has excellent performances of friction resistance, good hydrolysis resistance and the like.

The dehumidification explosion-proof insulation valve body for the power battery adopts the high-performance polyimide/fluoropolymer insulation composite film for equipotential insulation protection, and further improves the flame retardance, weather resistance and other performances of the valve body.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.