CN211957702U - A heat-releasing explosion-proof lithium-ion battery - Google Patents

Abstract

The utility model provides a heat-releasing and explosion-proof lithium ion battery, which comprises a heat-dissipating casing, a battery core is arranged in the heat-dissipating casing, an insulating heat-dissipating cover is fixed at the opening of the heat-dissipating casing, and the battery core is fixedly connected to the bottom of the insulating heat-dissipating cover to dissipate heat. The outer shell is also filled with electrolyte, and the outer surface of the heat dissipation shell is fixed with a number of outer thermally conductive convex strips; the battery core includes a positive electrode sheet, a diaphragm sheet and a negative electrode sheet that are stacked and wound, and the surface of the positive electrode sheet is covered with a first graphene layer, and the negative electrode is covered with a first graphene layer. The surface of the sheet is covered with a second graphene layer, the positive electrode sheet is connected with a positive electrode lug, the negative electrode sheet is connected with a negative electrode lug, and both the positive electrode lug and the negative electrode lug are arranged through the insulating heat dissipation cover. The utility model can significantly improve the heat exchange efficiency between the battery core and the electrolyte through the graphene layer, and can effectively avoid heat accumulation in the battery core. In addition, the heat dissipation shell and the outer heat conduction ridges on the surface can further improve the heat transfer rate of the lithium ion battery. Efficiency released to the outside world.

Description

A heat-releasing explosion-proof lithium-ion battery

technical field

The utility model relates to a lithium ion battery, and specifically discloses a heat-releasing explosion-proof lithium ion battery.

Background technique

A lithium-ion battery is a high-performance battery that uses a lithium-containing compound as the positive electrode and a carbon material as the negative electrode to work by moving lithium ions between the positive electrode and the negative electrode. Lithium-ion batteries have the advantages of long life, low self-discharge rate, environmental protection and energy saving.

The lithium-ion battery will generate a certain amount of heat during the charging and discharging process, which will cause the temperature of the lithium-ion battery to rise. Once the temperature is too high, it will affect the performance of the lithium-ion battery. Once the temperature is too high, the lithium-ion battery will also produce irreversible defects such as bulging. The impact of the reaction greatly shortens the service life of lithium-ion batteries, and in severe cases, it may lead to fire or even explosion, posing a safety hazard.

Utility model content

Based on this, it is necessary to provide a heat-releasing and explosion-proof lithium-ion battery for the problems of the prior art, which has efficient heat release performance and can avoid safety problems caused by the high temperature of the lithium-ion battery during operation.

In order to solve the problems of the prior art, the utility model discloses a heat-releasing explosion-proof type lithium ion battery, which comprises a heat-dissipating casing, an electric core is arranged in the heat-dissipating casing, an insulating heat-dissipating cover is fixed at the opening of the heat-dissipating casing, and the electric core is fixedly connected to the insulating heat-dissipating casing. At the bottom of the heat dissipation cover, the heat dissipation shell is also filled with electrolyte, and the outer surface of the heat dissipation shell is fixed with a number of external heat conduction convex strips;

The battery core includes a positive electrode sheet, a separator sheet and a negative electrode sheet that are stacked and wound, the separator sheet is located between the positive electrode sheet and the negative electrode sheet, the surface of the positive electrode sheet is covered with a first graphene layer, and the surface of the negative electrode sheet is covered with a second graphene layer The positive electrode piece is connected with a positive electrode lug, the negative electrode plate is connected with a negative electrode lug, and the positive electrode lug and the negative electrode lug are both arranged through the insulating heat dissipation cover.

Further, the heat dissipation shell is a heat dissipation ceramic shell.

Further, a plurality of inner heat-conducting protruding strips are fixed inside the heat-dissipating casing.

Further, the inner wall of the heat dissipation shell is covered with a sealing film, and the sealing film is also covered on the side of the insulating heat dissipation cover close to the battery core.

Further, the sealing film is an aluminum-plastic film.

Further, the insulating heat dissipation cover is a thermally conductive silicone cover.

Further, the insulating heat dissipation cover is provided with a first heat dissipation fin and a second heat dissipation fin spaced from each other, the first heat dissipation fin is fixedly connected to the positive electrode lug, and the second heat dissipation fin is fixedly connected to the negative electrode lug.

The beneficial effects of the utility model are as follows: the utility model discloses a heat-releasing explosion-proof type lithium ion battery, which is provided with a special electric core structure, and the graphene layers on the surfaces of the positive electrode sheet and the negative electrode sheet can significantly improve the interaction between the electric core and the electrolyte. The heat exchange efficiency can effectively avoid the accumulation of heat in the battery core. In addition, the heat dissipation shell and the external thermal conductive ribs on the surface can further improve the efficiency of the lithium-ion battery to release heat to the outside world, and can avoid the temperature of the lithium-ion battery during operation. too high and cause safety problems.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

FIG. 2 is a schematic view of the structure of the battery core in the present invention.

Reference numerals are: heat dissipation shell 10 , outer thermally conductive ridges 11 , inner thermally conductive ridges 12 , sealing film 13 , battery core 20 , positive electrode sheet 21 , first graphene layer 211 , diaphragm sheet 22 , negative electrode sheet 23 , second The graphene layer 231 , the positive electrode lug 24 , the negative electrode lug 25 , the insulating heat dissipation cover 30 , the first heat dissipation fin 31 , the second heat dissipation fin 32 , and the electrolyte 40 .

Detailed ways

In order to further understand the features, technical means, and specific goals and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Refer to Figure 1 and Figure 2.

The embodiment of the present utility model discloses a heat-releasing explosion-proof lithium-ion battery, which includes a heat-dissipating casing 10, a battery cell 20 is arranged in the heat-dissipating casing 10, an insulating heat-dissipating cover 30 is fixed at the opening of the heat-dissipating casing 10 by glue, and the insulating heat-dissipating cover 30 It has good heat dissipation performance. The battery core 20 is fixedly connected to the bottom of the insulating heat dissipation cover 30. The direct contact of the battery core 20 with the insulating heat dissipation cover 30 can further improve the heat dissipation efficiency of the battery core 20. The heat dissipation shell 10 is also filled with electrolyte 40. The outer surface of the heat-dissipating housing 10 is fixed with a number of outer heat-conducting protruding strips 11 integrally formed with the heat-dissipating housing 10 . Heat build-up and lithium-ion batteries can cause fires and even explosions;

The battery cell 20 includes a positive electrode sheet 21, a separator sheet 22 and a negative electrode sheet 23 that are stacked and wound. There are two separator sheets 22, and the separator sheet 22 is located between the positive electrode sheet 21 and the negative electrode sheet 23. Preferably, the positive electrode sheet 21, the separator Sheet 22, negative electrode sheet 23 and another diaphragm sheet 22 are wound and stacked in turn to obtain cell 20. One or both surfaces of positive electrode sheet 21 are covered with a first graphene layer 211, and one or both surfaces of negative electrode sheet 23 are covered with a first graphene layer 211. Covered with the second graphene layer 231, the graphene has good electrical conductivity and thermal conductivity, while ensuring that the battery core 20 can work normally, the heat dissipation efficiency of the battery core 20 can be effectively improved. When the positive electrode sheet 21 and the negative electrode sheet 23 work The formed heat is efficiently transferred to the electrolyte 40 by the first graphene layer 211 and the second graphene layer 231, and the electrolyte 40 releases the heat to the external environment through the insulating heat dissipation cover 30 and the heat dissipation shell 10, thereby effectively reducing the heat dissipation. Heat is accumulated in the battery core 20, the positive electrode sheet 21 is connected with a positive electrode lug 24, and the negative electrode sheet 23 is connected with a negative electrode lug 25. After the positive electrode tab 24 and the negative electrode tab 25 of the heat dissipation cover 30 are insulated, a lithium ion battery can be used for discharging or charging.

In this embodiment, the heat dissipation shell 10 is a heat dissipation ceramic shell, that is, the heat dissipation shell 10 is an alumina ceramic shell, which has good insulation performance and thermal conductivity.

In the present embodiment, a plurality of inner heat conduction ridges 12 integrally formed with the heat dissipation casing 10 are fixed inside the heat dissipation casing 10 , and the inner heat conduction convex strips 12 can effectively increase the contact area between the heat dissipation casing 10 and the electrolyte 40 , thereby effectively increasing the lithium ion Efficiency of heat release inside an ion battery.

In this embodiment, the inner wall of the heat dissipation shell 10 is covered with a sealing film 13, and the sealing film 13 is also covered on the side of the insulating heat dissipation cover 30 close to the battery core 20. The sealing film 13 can effectively improve the sealing performance of the lithium ion battery, and can effectively In order to avoid liquid leakage, when the inner thermally conductive ridges 12 are provided in the heat dissipation casing 10 , the sealing film 13 covers the surface of the inner thermally conductive ridges 12 .

Based on the above embodiment, the sealing film 13 is an aluminum-plastic film. The aluminum-plastic film has good barrier properties, strong puncture resistance, and can maintain good stability in the environment of the electrolyte 40 .

In this embodiment, the insulating heat dissipation cover 30 is a thermally conductive silica gel cover, and the thermally conductive silica gel has good heat dissipation performance and insulation performance.

Based on the above embodiment, the insulating heat dissipation cover 30 is provided with a first heat dissipation fin 31 and a second heat dissipation fin 32 spaced apart from each other, the first heat dissipation fin 31 is fixedly connected to the positive electrode lug 24, and the second heat dissipation fin 32 is connected to the negative electrode The lugs 25 are fixedly connected, and the heat exchange efficiency between the positive electrode lugs 24 and the negative electrode lugs 25 and the insulating heat dissipation cover 30 can be effectively improved through the heat dissipation fins, thereby further improving the heat release efficiency of the lithium ion battery.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (7)

1. The heat-release explosion-proof lithium ion battery is characterized by comprising a heat-dissipation shell (10), wherein a battery cell (20) is arranged in the heat-dissipation shell (10), an insulating heat-dissipation cover (30) is fixed at an opening of the heat-dissipation shell (10), the battery cell (20) is fixedly connected to the bottom of the insulating heat-dissipation cover (30), electrolyte (40) is filled in the heat-dissipation shell (10), and a plurality of outer heat-conducting convex strips (11) are fixed on the outer surface of the heat-dissipation shell (10);

electric core (20) are including range upon range of positive plate (21), diaphragm (22) and negative pole piece (23) around rolling up, diaphragm (22) are located positive plate (21) with between negative pole piece (23), the surface covering of positive plate (21) has first graphite alkene layer (211), the surface covering of negative pole piece (23) has second graphite alkene layer (231), positive plate (21) are connected with anodal ear (24), negative pole piece (23) are connected with negative pole ear (25), anodal ear (24) with negative pole ear (25) all pass insulating cooling cap (30) set up.

2. The lithium ion battery of claim 1, wherein the heat dissipation housing (10) is a heat dissipation ceramic case.

3. The lithium ion battery of claim 1, wherein a plurality of inner heat conducting ribs (12) are fixed inside the heat dissipation casing (10).

4. The lithium ion battery of claim 1 or 3, wherein the inner wall of the heat dissipation shell (10) is covered with a sealing film (13), and the sealing film (13) is further covered on one side of the insulating heat dissipation cover (30) close to the battery core (20).

5. The lithium ion battery of claim 4, wherein the sealing film (13) is an aluminum plastic film.

6. The lithium ion battery of claim 1, wherein the insulating and heat dissipating cover (30) is a thermally conductive silicone cover.

7. The heat release explosion-proof lithium ion battery according to claim 6, wherein a first heat dissipation fin (31) and a second heat dissipation fin (32) are arranged in the insulating heat dissipation cover (30) and are spaced from each other, the first heat dissipation fin (31) is fixedly connected with the positive tab (24), and the second heat dissipation fin (32) is fixedly connected with the negative tab (25).

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