Lossless explosion-proof safety battery capable of automatically reducing pressure and exhausting air

Abstract

The utility model relates to a lossless explosion-proof safety battery capable of automatically reducing pressure and exhausting, which comprises a positive pole main body and an explosion-proof mechanism, a positive pole cap is mounted on the positive pole main body, the explosion-proof mechanism comprises a valve cavity, a pneumatic magnet assembly and a plugging piece, the pneumatic magnet assembly and the plugging piece are both positioned in the valve cavity, and the positive pole cap is provided with a pressure relief hole. One end of the exhaust hole is communicated with the valve cavity, the other end of the exhaust hole is communicated with the interior of the battery, one end of the plugging piece is connected with the pneumatic magnet assembly, and the other end of the plugging piece is plugged on the exhaust hole; when the interior of the battery expands to generate high pressure, the plugging piece is separated from the exhaust hole and compresses the pneumatic magnet assembly, and a pressure relief channel composed of the exhaust hole, the valve cavity and the pressure relief hole is formed. According to the explosion-proof battery, air pressure can be exhausted without damage and leakage, high-pressure explosion of the battery is prevented, greater safety problems and environmental pollution problems caused by explosion of the battery are effectively avoided, and the safety and the explosion-proof effect of the battery are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a safety battery with non-destructive explosion-proof automatic decompression and exhaust. Background Art

[0002] In recent years, with the rapid increase in the types of electrical appliances, the requirements for battery energy density, weight, self-discharge and safety have also become increasingly higher. Conventional cylindrical batteries such as Ni-Cd (nickel cadmium) and Ni-MH (nickel metal hydride) can no longer meet market demand in terms of electrical performance, specifications and safety performance. Compared with other batteries, lithium-ion batteries have higher energy density, lighter weight, smaller self-discharge and better safety. Therefore, the share of lithium-ion batteries in the battery market has also increased rapidly.

[0003] Existing cylindrical lithium-ion batteries are made by stacking the positive electrode sheet, separator and negative electrode sheet and winding them into a cylindrical core. The negative electrode tab of the core is then welded to the corresponding cylindrical nickel-plated steel shell by laser or resistance welding. The positive electrode tab is welded to the positive electrode cap by laser welding. After the electrolyte is injected, the positive electrode cap and the steel shell are completely encapsulated into a whole through physical and mechanical pressure to finally form a battery. When the positive and negative electrode sheets directly or indirectly contact each other inside the battery, it will cause an internal short circuit. The battery will instantly release a large amount of heat, causing the internal temperature and pressure of the battery to rise sharply. The high temperature and high pressure generated can cause safety problems such as fire and explosion of the battery. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a non-destructive explosion-proof and automatically decompressed and vented safety battery, so as to at least solve the problem that existing lithium-ion batteries may be squeezed, internally short-circuited or externally short-circuited, resulting in high-temperature expansion and explosion hazards.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] The utility model discloses a non-destructive, explosion-proof and automatically decompressing and exhausting safety battery, comprising a positive electrode body and an explosion-proof mechanism installed in the positive electrode body, a positive electrode cap being installed on the positive electrode body, and the explosion-proof mechanism comprising a valve cavity, a pneumatic magnet assembly and a sealing member, the pneumatic magnet assembly and the sealing member being both located in the valve cavity, and a gap being left between the pneumatic magnet assembly and the valve cavity, the pneumatic magnet assembly being a telescopic structure, the positive electrode cap having a pressure relief hole at a position corresponding to the valve cavity, the positive electrode body having an exhaust hole at a position corresponding to the valve cavity, the exhaust hole being connected to the valve cavity, one end of the exhaust hole being connected to the valve cavity, and the other end being connected to the interior of the battery, one end of the sealing member being connected to the pneumatic magnet assembly, and the other end being sealed on the exhaust hole; when the internal expansion of the battery generates high pressure, the sealing member detaches from the exhaust hole and compresses the pneumatic magnet assembly, forming a pressure relief channel consisting of the exhaust hole, the valve cavity and the pressure relief hole.

[0007] In some embodiments, the pneumatic magnet assembly includes a first magnet and a second magnet, both of which are located in the valve cavity, and there is a gap between the outer walls of the first magnet and the second magnet and the inner wall of the valve cavity, and the first magnet and the second magnet are installed with the same poles facing each other; the sealing assembly is installed on the second magnet.

[0008] In some embodiments, the positive electrode cap has at least two pressure relief holes, and the positions of the pressure relief holes correspond to the gap between the pneumatic magnet assembly and the valve cavity.

[0009] In some embodiments, the blocking member is spherical, hemispherical, cylindrical, or T-shaped.

[0010] In some embodiments, the non-destructive explosion-proof automatic decompression and exhaust safety battery further includes a battery housing and a battery cell installed inside the battery housing.

[0011] In some embodiments, the positive electrode tab of the battery cell is connected to the positive electrode body.

[0012] In some embodiments, the positive electrode body is mounted on one end of the battery housing, and an insulating sealing ring is provided between the positive electrode body and the battery housing.

[0013] In some embodiments, an insulating sealing ring is also provided between the positive electrode cap and the battery housing.

[0014] The utility model discloses a non-destructive, explosion-proof, and automatically decompressing and exhausting safety battery. A valve cavity is provided inside the positive electrode body, and a pneumatic magnet assembly is installed inside the valve cavity. The pneumatic magnet assembly can expand and contract, and is compressed under pressure, thereby driving the sealing member connected to the pneumatic magnet assembly to move. The sealing member is installed to seal the exhaust hole. When the battery expands due to high temperature and is squeezed internally or there is a risk of explosion due to external short circuit, and the pressure inside the battery shell is too high, the air pressure inside the battery shell acts on the sealing member through the exhaust hole. The strong air pressure acts on the sealing member to compress the pneumatic magnet assembly, thereby separating the sealing member from the exhaust hole. The air pressure inside the battery shell is released from the pressure relief hole through the exhaust hole and the valve cavity, thereby releasing the pressure inside the battery shell and preventing the battery from exploding due to excessive internal pressure. When the pressure inside the battery shell is released, the pneumatic magnet assembly recovers, and the sealing member can be sealed on the exhaust hole again, sealing the exhaust hole again and achieving sealing inside the battery shell.

[0015] The non-destructive explosion-proof and automatic decompression and exhaust safety battery of the utility model can achieve lossless and leakage-free exhaust of air pressure, prevent high-voltage explosion of the battery, effectively avoid greater safety problems and environmental pollution problems caused by battery explosion, and effectively improve the safety and explosion-proof effect of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of a non-destructive explosion-proof automatic decompression and exhaust safety battery of the utility model;

[0017] Figure 2 This is a schematic structural diagram of a non-destructive explosion-proof and automatically decompressing and exhausting safety battery of the utility model;

[0018] Among them, the positive electrode body 100, the exhaust hole 110, the positive electrode cap 200, the pressure relief hole 210, the valve chamber 310, the first magnet 321, the second magnet 322, the sealing member 330, the battery shell 400, the battery cell 500, the positive electrode ear strip 510, and the insulating sealing ring 600. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and are only schematic diagrams, not actual drawings. They should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the dimensions of the actual product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0020] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", "front", "back", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the figures. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] Please refer to Figure 1-2 :

[0022] The utility model discloses a non-destructive explosion-proof automatic decompression and exhaust safety battery, comprising a positive electrode body 100 and an explosion-proof mechanism installed in the positive electrode body 100, a positive electrode cap 200 installed on the positive electrode body 100, and an explosion-proof mechanism comprising a valve cavity 310, a pneumatic magnet assembly and a blocking member 330, both of which are located in the valve cavity 310, and a gap is left between the pneumatic magnet assembly and the valve cavity 310, the pneumatic magnet assembly is a telescopic structure, and the positive electrode cap 200 has a pressure relief hole at a position corresponding to the valve cavity 310. 210, the positive electrode body 100 has an exhaust hole 110 at a position corresponding to the valve cavity 310, the exhaust hole 110 is connected to the valve cavity 310, one end of the exhaust hole 110 is connected to the valve cavity 310, and the other end is connected to the interior of the battery, one end of the sealing member 330 is connected to the pneumatic magnet assembly, and the other end is sealed on the exhaust hole 110; when the internal expansion of the battery generates high pressure, the sealing member 330 detaches from the exhaust hole 110 and compresses the pneumatic magnet assembly, forming a pressure relief channel consisting of the exhaust hole 110, the valve cavity 310 and the pressure relief hole 210.

[0023] Using the above technical solution, a valve chamber 310 is opened inside the positive electrode body 100, and a pneumatic magnet assembly is installed inside the valve chamber 310. The pneumatic magnet assembly can expand and contract, and is compressed under pressure, thereby driving the blocking member 330 connected to the pneumatic magnet assembly to move. The blocking member 330 is installed to block the exhaust hole 110. When the battery expands at high temperature and is squeezed internally or there is an external short circuit and there is a risk of explosion, when the pressure inside the battery shell is too high, the air pressure inside the battery shell acts on the blocking member 330 through the exhaust hole 110. The strong air pressure acts on the blocking member 330, causing it to compress the pneumatic magnet assembly, thereby separating the blocking member 330 from the exhaust hole 110. The air pressure inside the battery shell is released from the pressure relief hole 210 through the exhaust hole 110 and the valve chamber 310, thereby releasing the pressure inside the battery shell and preventing the battery from exploding due to excessive internal pressure. When the pressure inside the battery housing is released, the pneumatic magnet assembly recovers and can again seal the blocking member 330 on the exhaust hole 110 , thereby sealing the exhaust hole 110 again and achieving sealing inside the battery housing.

[0024] In this embodiment, the pneumatic magnet assembly includes a first magnet 321 and a second magnet 322. The first magnet 321 and the second magnet 322 are both located in the valve cavity 310, and there is a gap between the outer walls of the first magnet 321 and the second magnet 322 and the inner wall of the valve cavity 310. The first magnet 321 and the second magnet 322 are installed opposite to each other with the same poles; the sealing member 330 is installed on the second magnet 322.

[0025] The first magnet 321 and the second magnet 322 are mounted opposite each other with the same poles, that is, the north pole of the first magnet 321 and the north pole of the second magnet 322 are mounted opposite each other, or the south pole of the first magnet 321 and the south pole of the second magnet 322 are mounted opposite each other. The repulsive force generated by the same poles of the first magnet 321 and the second magnet 322 presses the sealing member 330 against the vent 110, thereby sealing the vent 110. When the battery expands due to high temperature and is squeezed internally or short-circuited externally, posing a potential explosion hazard, and the pressure inside the battery case is too high to exceed the repulsive force between the first magnet 321 and the second magnet 322, the second magnet 322 moves, driving the sealing member 330 away from the vent 110, thereby releasing the internal pressure of the battery case 400 through the vent 110, the valve chamber 310, and the pressure relief hole 210.

[0026] In this embodiment, the positive electrode cap 200 has at least two pressure relief holes 210. The positions of the pressure relief holes 210 correspond to the gap between the pneumatic magnet assembly and the valve chamber 310, so as to effectively and quickly release the pressure inside the battery housing 400. In this embodiment, four pressure relief holes 210 are preferably used.

[0027] In this embodiment, the blocking member 330 is spherical, hemispherical, cylindrical, or T-shaped, and may also be other shapes that can completely block the exhaust hole 110 .

[0028] In this embodiment, the non-destructive explosion-proof and automatically decompressed and vented safety battery further includes a battery housing 400 and a battery cell 500 installed inside the battery housing 400 , wherein the positive electrode tab 510 of the battery cell 500 is connected to the positive electrode body 100 .

[0029] In this embodiment, the positive electrode body 100 is mounted on one end of the battery casing 400. An insulating seal 600 is provided between the positive electrode body 100 and the battery casing 400, and the positive electrode body 100 and the battery casing 400 are insulated and isolated by the insulating seal 600. An insulating seal 600 is also provided between the positive electrode cap 200 and the battery casing 400, and the positive electrode cap 200 is mounted on the battery casing 400 via the insulating seal 600. At the same time, the positive electrode cap 200 and the battery casing 400 are insulated and isolated by the insulating seal 600.

[0030] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalent substitutions shall be encompassed by the claims of the present invention. The techniques, shapes, and structural portions not described in detail in the present invention are well known.

Claims

1. Non-destructive explosion-proof automatic decompression and exhaust safety battery, characterized by: It includes a positive electrode body and an explosion-proof mechanism installed in the positive electrode body, a positive electrode cap is installed on the positive electrode body, the explosion-proof mechanism includes a valve cavity, a pneumatic magnet assembly and a sealing piece, the pneumatic magnet assembly and the sealing piece are both located in the valve cavity, and a gap is left between the pneumatic magnet assembly and the valve cavity, the pneumatic magnet assembly is a telescopic structure, the positive electrode cap has a pressure relief hole at a position corresponding to the valve cavity, the positive electrode body has an exhaust hole at a position corresponding to the valve cavity, the exhaust hole is connected to the valve cavity, one end of the exhaust hole is connected to the valve cavity, and the other end is connected to the interior of the battery, one end of the sealing piece is connected to the pneumatic magnet assembly, and the other end is sealed on the exhaust hole; when the internal expansion of the battery generates high pressure, the sealing piece detaches from the exhaust hole and compresses the pneumatic magnet assembly to form a pressure relief channel consisting of the exhaust hole, the valve cavity and the pressure relief hole.

2. The non-destructive explosion-proof and automatic decompression and exhaust safety battery according to claim 1 is characterized in that: The pneumatic magnet assembly includes a first magnet and a second magnet, both of which are located in the valve cavity, and there is a gap between the outer walls of the first magnet and the second magnet and the inner wall of the valve cavity, and the first magnet and the second magnet are installed opposite to each other with the same poles; the sealing member is installed on the second magnet.

3. The non-destructive explosion-proof and automatic decompression and exhaust safety battery according to claim 2, characterized in that: The positive electrode cap is provided with at least two pressure relief holes, and the positions of the pressure relief holes correspond to the gap between the pneumatic magnet assembly and the valve cavity.

4. The non-destructive explosion-proof automatic decompression and exhaust safety battery according to claim 1, characterized in that: The blocking piece is spherical, hemispherical, cylindrical or T-shaped.

5. The non-destructive explosion-proof automatic decompression and exhaust safety battery according to claim 1, characterized in that: The safety battery further includes a battery housing and a battery cell installed inside the battery housing.

6. The non-destructive explosion-proof and automatic decompression and exhaust safety battery according to claim 5, characterized in that: The positive electrode tab of the battery cell is connected to the positive electrode body.

7. The non-destructive explosion-proof and automatic decompression and exhaust safety battery according to claim 5, characterized in that: The positive electrode body is installed at one end of the battery shell, and an insulating sealing ring is provided between the positive electrode body and the battery shell.

8. The non-destructive explosion-proof and automatically decompressed and exhausted safety battery according to claim 7, characterized in that: An insulating sealing ring is also provided between the positive electrode cap and the battery housing.

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