Immersed lithium battery device for electric two-wheeled vehicle

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses an immersed electric two-wheeled vehicle lithium battery device which comprises a container, and an auxiliary mechanism is arranged on the outer side of the container and extends into the container; the auxiliary mechanism comprises a lithium battery pack, the lithium battery pack is embedded in the container, a plurality of lithium battery monomers are arranged in order through a structural member, and the lithium battery is immersed in the container filled with cooling liquid, so that oxygen in air can be isolated, and on the other hand, oxygen in the air can be isolated; when one or more batteries are subjected to thermal runaway, such as extrusion, short circuit, needling, overcharge and overdischarge, heat can be quickly conducted to the outside of the container by using the cooling liquid with high heat conductivity coefficient, so that each lithium battery monomer in the lithium battery pack is cooled, the temperature of the lithium battery monomer is controlled, the thermal runaway of one or more batteries is avoided, and the service life of the lithium battery pack is prolonged. Therefore, the purpose of protecting the whole lithium battery pack is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium batteries, in particular to an immersed lithium battery device for electric two-wheel vehicles. BACKGROUND

[0002] Lithium ion batteries, whether ternary lithium batteries, lithium iron phosphate batteries, lithium manganate batteries, sodium ion batteries and the like, all have the phenomenon of thermal runaway, thereby causing phenomena such as combustion and explosion. When full-charge needle puncture testing is performed on the above-mentioned ternary lithium batteries, lithium iron phosphate batteries, lithium manganate batteries and sodium ion batteries and the like, only a certain percentage of the battery cells can pass the needle puncture test. Therefore, new demands are put forward for the thermal management of lithium battery packs.

[0003] The thermal management of traditional lithium battery packs mainly adopts heat dissipation modes such as natural cooling, air cooling, water-cooled plate liquid cooling and heat-conducting adhesive wrapping. Such thermal management modes can only alleviate the heat dissipation problem of lithium battery packs, but cannot fundamentally and completely solve the problems of thermal runaway and thermal spread of lithium battery packs in various environments.

[0004] In order to solve the above problems, the application provides an immersed lithium battery device for electric two-wheel vehicles. CONTENT OF THE INVENTION

[0005] The immersed lithium battery device for electric two-wheel vehicles provided by the application adopts the following technical solution:

[0006] The immersed lithium battery device for electric two-wheel vehicles comprises a container, an auxiliary mechanism is arranged on the outer side of the container, and the auxiliary mechanism extends into the interior of the container.

[0007] The auxiliary mechanism comprises a lithium battery pack, the lithium battery pack is embedded in the interior of the container, a plurality of lithium battery monomers are orderly arranged through a structural member, the lithium battery pack is composed of a plurality of groups of lithium battery monomers, a plurality of lithium battery protection plates are embedded in the container, the lithium battery protection plates are uniformly distributed, a cooling liquid is arranged in the interior of the container, the lithium battery pack is immersed in the cooling liquid, and a connecting component is arranged on the outer side of the lithium battery pack.

[0008] Further, the connecting component comprises a sealing cover plate, and the sealing cover plate is arranged on the top of the container.

[0009] Through the above technical solution, the container can be sealed by arranging the sealing cover plate.

[0010] Further, the container is made of metal material, and the container is composed of an installation frame, a frame body and a bottom plate which are welded and fixed.

[0011] Further, a handle, an electrical interface and a discharging interface are arranged on the top of the sealing cover plate, and the handle is arranged on one side of the electrical interface and the discharging interface.

[0012] Further, the mounting frame top is provided with a plurality of planar grooves, and the plurality of planar grooves are uniformly distributed.

[0013] Through the above technical solution, the plurality of planar grooves can be sealed by pre-gluing and screw fixing mode to seal the cover plate and the container.

[0014] Further, the cooling liquid is composed of one of ultralow viscosity polyalphaolefin mPAO obtained by metallocene polymerization, low viscosity CTL, and silicone oil and fluorinated liquid.

[0015] Through the above technical solution, the composition of the immersion cooling liquid includes a base cooling liquid, a modified nano insulating heat-conducting fluid, and a plurality of functional additives, and the additives include at least one of an antioxidant, a corrosion inhibitor, an antifoaming agent, a rust inhibitor, and a dispersant.

[0016] In summary, the present application has the following beneficial technical effects:

[0017] The lithium battery is immersed in the container filled with the cooling liquid, which can isolate oxygen in the air, and when a single or multiple batteries are in thermal runaway conditions such as extrusion, short circuit, needle puncture, overcharge, and overdischarge, the cooling liquid with high thermal conductivity can quickly conduct heat to the outside of the container to cool the lithium battery monomers in the lithium battery pack, control the temperature of the lithium battery monomers, avoid thermal runaway of a single or multiple batteries, affect the surrounding adjacent lithium batteries, and thus achieve the purpose of protecting the entire lithium battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the appearance structure of the present application;

[0019] Figure 2 is a schematic diagram of the top view structure of the present application;

[0020] Figure 3 is a schematic diagram of the side internal structure of the present application.

[0021] Explanation of reference numerals in the drawing:

[0022] 2, container; 6, lithium battery pack; 601, lithium battery monomer; 5, lithium battery protection plate; 3, cooling liquid; 201, sealing cover plate; 202, mounting frame; 203, frame body; 204, bottom plate; 101, handle; 103, electrical interface; 102, discharge interface; 401, planar groove. DETAILED DESCRIPTION

[0023] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below; obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments in the present application shall fall within the protection scope of the present application.

[0024] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood in a broad sense, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiments

[0026] The embodiments of the present application disclose an immersed electric two-wheeled vehicle lithium battery device, please refer to Figure 1 、 Figure 2 and Figure 3 , comprising a container 2, an auxiliary mechanism is arranged outside the container 2, and the auxiliary mechanism extends into the container 2;

[0027] The auxiliary mechanism comprises a lithium battery pack 6, the lithium battery pack 6 is embedded in the container 2, a plurality of lithium battery monomers 601 are orderly arranged through a structural member, the lithium battery pack 6 is composed of a plurality of lithium battery monomers 601, a plurality of lithium battery protection plates 501 are embedded in the container 2, the plurality of lithium battery protection plates 501 are uniformly distributed, a cooling liquid 3 is arranged in the container 2, and the lithium battery pack 6 is immersed in the cooling liquid 3;

[0028] Please refer to Figure 1 , a connecting component is arranged outside the lithium battery pack 6, the connecting component comprises a sealing cover plate 201, the sealing cover plate 201 is located at the top of the container 2, the container 2 is made of metal material, the container 2 is composed of a mounting frame 202, a frame body 203 and a bottom plate 204 and is fixedly welded, and the sealing cover plate 201 can seal the container 2;

[0029] Please refer to Figure 1 , Figure 2 and Figure 3 , the sealing cover plate 201 is provided with a handle 101, an electrical interface 103 and a discharge interface 102, the handle 101 is located on one side of the electrical interface 103 and the discharge interface 102, and a plurality of planar grooves 401 are formed in the top of the mounting frame 202 and are uniformly distributed, and the sealing cover plate 201 and the container 2 are sealed by pre-gluing and screwing.

[0030] Please refer to Figure 3 , the cooling liquid 3 is composed of ultra-low viscosity polyalphaolefin mPAO obtained by metallocene polymerization, low viscosity CTL, and one of silicone oil and fluorinated liquid, the composition of the immersion cooling liquid 3 includes base cooling liquid 3, modified nano insulating heat-conducting fluid, and several functional additives, including at least one of antioxidants, corrosion inhibitors, antifoaming agents, rust inhibitors and dispersants.

[0031] The implementation principle of the embodiment is: in use, first, the lithium battery monomer 601 is subjected to a needle test, a short circuit test and a heating test; the needle test: the ambient temperature is 24℃, about 200ml of cooling liquid 3 is poured into the container 2, and the lithium battery monomer 601 is immersed for the needle test; during the needle test, bubbles and flames are generated, and the temperature of the cooling liquid 3 rises by about 3℃; after ten minutes of needle test, the lithium battery monomer 601 is taken out, which is slightly heated, and the experimental result is that the immersion of the lithium battery monomer 601 can prevent the combustion and explosion of the battery due to the needle test, and the temperature rise is limited; the short circuit test: the ambient temperature is 24℃, about 200ml of cooling liquid 3 is poured into the container 2, and the lithium battery monomer 601 is immersed for the short circuit test; during the short circuit test, no bubbles and flames are generated, and the temperature of the cooling liquid 3 rises by about 4℃; after five minutes of short circuit, the temperature of the cooling liquid 3 is basically fixed, and the temperature of the external short circuit copper wire is 100℃; after 20 minutes of short circuit, the short circuit is disconnected, and the lithium battery monomer 601 is taken out from the cooling liquid 3, and the battery is slightly heated, and the experimental result is that the immersion of the lithium battery monomer 601 can prevent the combustion and explosion of the battery due to the short circuit, and the temperature rise is limited; the heating test: the ambient temperature is 24℃, about 200ml of cooling liquid 3 is poured into the container 2, and the lithium battery monomer 601 is immersed for the heating test; after heating to 180℃, stop, wait for the cooling liquid 3 to cool down, and then take out the lithium battery, and the appearance of the battery remains intact, and the experimental result is that the immersion of the lithium battery monomer 601 can prevent the combustion and explosion of the battery due to thermal runaway, through the above operation, the combustion and explosion phenomenon of various lithium batteries cannot be completely solved by other cooling methods in the market, such as air cooling, cold plate liquid cooling, glue cooling and pasting flame-retardant sheet, and the use of the more environmentally friendly and safe immersion cooling liquid 3 as a medium can greatly reduce the heat generated by the lithium battery during operation, thereby prolonging the service life of the lithium battery.

[0032] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An immersion electric two-wheeler lithium battery device comprising a container (2), characterized in that: The container (2) is externally provided with an auxiliary mechanism extending to the inside of the container (2); The auxiliary mechanism comprises a lithium battery pack (6) embedded in the container (2), a plurality of lithium battery cells (601) are orderly arranged by a structural member, the lithium battery pack (6) is composed of a plurality of lithium battery cells (601), a plurality of lithium battery protection plates (501) are embedded in the container (2), the plurality of lithium battery protection plates (501) are uniformly distributed, the container (2) is internally provided with a cooling liquid (3), the lithium battery pack (6) is immersed in the cooling liquid (3), and the lithium battery pack (6) is externally provided with a connecting member.

2. The submerged e-scooter lithium battery device of claim 1, wherein: The connecting member comprises a sealing cover plate (201) located at the top of the container (2).

3. The submerged e-scooter lithium battery device of claim 1, wherein: The container (2) is made of metal material and is composed of a mounting frame (202), a frame body (203) and a bottom plate (204) welded and fixed.

4. The submerged e-scooter lithium battery device of claim 2, wherein: A handle (101), an electric interface (103) and a discharge interface (102) are mounted on the top of the sealing cover plate (201), and the handle (101) is located on one side of the electric interface (103) and the discharge interface (102).

5. The submerged e-scooter lithium battery device of claim 3, wherein: A plurality of plane grooves (401) are formed on the top of the mounting frame (202), and the plurality of plane grooves (401) are uniformly distributed.

Images