Immersed battery car power battery device

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses an immersed battery car power battery device which comprises a metal container, a sealing cover plate is arranged at the top end of the metal container, an outer frame is arranged on the outer side of the top end of the metal container, and a first groove hole is formed in one side of the sealing cover plate; a second power socket is arranged on one side of the sealing cover plate through the first slotted hole; the battery pack is immersed in the sealed metal container filled with the cooling liquid, on one hand, oxygen in air can be isolated, and on the other hand, when one or more batteries are subjected to thermal runaway conditions such as extrusion, short circuit, needling, overcharge and overdischarge, heat can be quickly conducted to the outside of the metal container by using the cooling liquid with a high heat conductivity coefficient, so that the battery pack is prevented from being damaged. Therefore, each battery monomer in the battery pack is cooled, the temperature of the battery monomer is controlled, and the influence on the surrounding adjacent batteries due to thermal runaway of one or more batteries is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and more specifically, to an immersion-type electric vehicle power battery device. Background Art

[0002] With the implementation of the standards "Electrical Safety Requirements for Electric Bicycles" and "Safety Technical Specifications for Electric Bicycles", the implementation of regulations such as the vehicle mass of electric bicycles is less than or equal to 55kg and the nominal voltage of the battery is less than or equal to 48V, will cause a large number of lead-acid battery electric bicycle users to switch to lithium batteries. Lithium-ion batteries, whether ternary lithium batteries, lithium iron phosphate batteries or new sodium-ion batteries, all have thermal runaway phenomena, causing combustion, explosion and other phenomena. With the rapid development of electric bicycles, electric motorcycles, electric vehicles, etc., new demands have been put forward for battery pack thermal management.

[0003] At present, the thermal management of battery packs mainly adopts heat dissipation modes such as natural cooling, air cooling, water-cooled plate liquid cooling, and thermal conductive adhesive wrapping. This type of thermal management method can only alleviate the heat dissipation problem of the battery pack, but cannot fundamentally and completely solve the thermal runaway problem of the battery pack in various environments.

[0004] In order to solve the above problems, the present application provides an immersion-type electric vehicle power battery device. Utility Model Content

[0005] The present application provides an immersion type battery vehicle power battery device adopts the following technical solution:

[0006] A submerged electric vehicle power battery device comprises a metal container, a sealing cover plate is arranged at the top position of the metal container, an external frame is arranged on the outer side of the top of the metal container, a first slot is opened on one side of the sealing cover plate, and a second power socket is arranged on one side of the sealing cover plate through the first slot, a lithium battery protection plate and multiple battery structures are arranged below the sealing cover plate, and the lithium battery protection plate and the multiple battery structures are both located inside the metal container, the battery structure comprises a first plastic support frame and a second plastic support frame which are horizontally spaced and symmetrically distributed, and a battery pack is arranged between the first plastic support frame and the second plastic support frame.

[0007] Furthermore, a plurality of battery packs are linearly and evenly distributed between each group of the first plastic support frame and the second plastic support frame, and a gap is left between every two adjacent battery packs.

[0008] Through the above technical solution, the first plastic support frame and the second plastic support frame can achieve the supporting and positioning function of multiple battery packs between the two.

[0009] Furthermore, the metal container has a prismatic hollow box structure, and buffer foams are padded on the upper and lower parts and the surrounding walls inside the metal container.

[0010] Through the above technical solution, the buffer foam realizes the protection of the internal structure of the metal container.

[0011] Furthermore, an immersion coolant is poured into the metal container, and the immersion coolant submerges the battery pack or the lithium battery protection board. The immersion coolant is made of an ultra-low viscosity α-olefin mPAO or a low viscosity poly-α-olefin PAO or a low viscosity GTL material obtained by metallocene or non-metallocene catalyzed polymerization.

[0012] Through the above technical solution, the poured immersion coolant not only makes the overall product have the beneficial effects of environmental protection, greenness and low carbon, but also endows the product with extensive social benefits.

[0013] Furthermore, the external frame includes a handle cover plate arranged at the outer side position of the top end of the metal container. A second slot is opened at one side end of the handle cover plate, and a first power socket is arranged through the second slot at one side end of the handle cover plate. A handle is connected to the top of the handle cover plate.

[0014] Through the above technical solution, the handle facilitates the lifting, moving and transporting work of the overall product.

[0015] Furthermore, the handle has a circular rod structure in the shape of a "mouth", and the bottom end of the handle is rotatably connected to the top of the handle cover plate through a connecting seat. A rubber soft pad is fixedly sleeved on the outer wall at the top end of the handle.

[0016] Through the above technical solution, the rubber soft pad on the handle can improve the flexible contact effect with the hand.

[0017] In summary, the present application includes the following beneficial technical effects:

[0018] In the present application, the battery pack is immersed in a sealed metal container filled with coolant. On the one hand, it can isolate oxygen in the air. On the other hand, when one or more batteries are in a thermal runaway situation such as extrusion, short circuit, puncture, overcharge, over-discharge, etc., the coolant with a high thermal conductivity coefficient will quickly conduct the heat to the outside of the metal container to cool each battery cell in the battery pack, control the temperature of the battery cell, avoid thermal runaway of one or more batteries, affect the surrounding adjacent batteries, and thus protect the entire battery pack and extend the service life of the battery at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall appearance schematic diagram of the present application;

[0020] Figure 2It is one of the overall internal schematic diagrams of this application;

[0021] Figure 3 This is the second overall internal schematic diagram of this application;

[0022] Figure 4 This is a schematic diagram of the local structure of this application.

[0023] Description of the numbers in the figure:

[0024] 01. Handle; 02. Handle cover; 03. First power socket; 04. Second power socket; 05. Sealing cover; 06. Lithium battery protection board; 07. Metal container; 08. First plastic support frame; 09. Battery pack; 10. Second plastic support frame. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships 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 device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] Example:

[0029] The present application embodiment discloses an immersion type battery vehicle power battery device, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, comprising a metal container 07, a sealing cover plate 05 is arranged at the top position of the metal container 07, an external frame is arranged on the outer side of the top of the metal container 07, a first slot is opened on one side of the sealing cover plate 05, and a second power socket 04 is arranged on one side of the sealing cover plate 05 through the first slot, a lithium battery protection plate 06 and a plurality of battery structures are arranged below the sealing cover plate 05, and the lithium battery protection plate 06 and the plurality of battery structures are located inside the metal container 07, the battery structure comprises a first plastic support frame 08 and a second plastic support frame 10 which are horizontally spaced and symmetrically distributed, and a battery pack 09 is arranged between the first plastic support frame 08 and the second plastic support frame 10;

[0030] The sealing cover plate 05 is made of metal or plastic and embedded in the metal container 07, and is used to seal the metal container 07. The lithium battery protection plate 06 can be placed at any position inside the metal container 07. In addition, sealants are placed on all four sides of the bending part of the sealing cover plate 05 and the metal container 07, and the bending plane of the sealing cover plate 05 is sealed with the metal container 07 by screwing screws through the screw holes.

[0031] Multiple battery packs 09 are evenly distributed linearly between each group of first plastic support frames 08 and second plastic support frames 10, and a gap is left between each two adjacent battery packs 09. The metal container 07 is a prismatic hollow box structure, and the upper and lower parts of the inner side of the metal container 07 and the surrounding walls are padded with cushioning foam. The interior of the metal container 07 is filled with immersion coolant, and the immersion coolant covers the battery pack 09 or the lithium battery protection plate 06, and the immersion coolant is made of ultra-low viscosity alpha olefin mPAO or low viscosity polyalphaolefin PAO or low viscosity GTL material obtained by metallocene or non-metallocene catalytic polymerization;

[0032] Furthermore, the components of the immersion coolant include a basic coolant, a modified nano-insulated heat-conducting fluid, and a number of functional additives, wherein the basic coolant is composed of an ultra-low viscosity polyalphaolefin with a kinematic viscosity of 2cst-10cst and a high viscosity polyalphaolefin with a kinematic viscosity of 40cst-300cst, and the several functional additives include at least one of an antioxidant, a corrosion inhibitor, an antifoaming agent, a rust inhibitor, and a dispersant;

[0033] The external frame includes a handle cover 02 arranged at the outer position of the top end of the metal container 07, a second slot hole is opened on one side end of the handle cover 02, and a first power socket 03 is arranged on one side end of the handle cover 02 through the second slot hole, and a handle 01 is connected to the top of the handle cover 02. The handle 01 is a "mouth"-shaped round rod structure, and the bottom end of the handle 01 is rotatably connected to the top of the handle cover 02 through a connecting seat, and a rubber pad is fixedly sleeved on the outer wall at the top position of the handle 01.

[0034] The single 18650 ternary lithium battery product of this application can be subjected to a needle puncture test and a short circuit test:

[0035] Puncture test: At an ambient temperature of 24°C, pour about 200ml of coolant into a container and immerse the battery. Use a 18650 ternary lithium battery for a puncture test. During the puncture, bubbles and flames are generated, and the temperature of the coolant rises by about 3°C. After half an hour of puncture, take out the 18650 battery, and the battery continues to emit flames and heat. Immerse the battery in water. After 3 hours of puncture, take the battery out of the water and the battery is slightly hot. Experimental results: Immersing the ternary lithium battery can prevent the battery from burning and exploding due to puncture, and the temperature rise is limited.

[0036] Short-circuit test: When the ambient temperature is 24°C, pour about 200ml of coolant into the container, immerse the battery, and use 18650 ternary lithium battery for short-circuit test; during the short-circuit process, no bubbles and flames are generated, and the coolant temperature rises by about 4°C; after 5 minutes of acupuncture, the coolant temperature rise is basically fixed, and the temperature on the external short-circuit copper wire is 100°C; after 20 minutes of short-circuit, disassemble the short circuit, take the battery out of the coolant, and the battery is slightly hot; Experimental results: Immersing the ternary lithium battery can prevent the battery from burning and exploding due to short circuit, and the temperature rise is limited.

[0037] The parameters of mPAO used in the utility model are compared with the product specifications of 3M's fluorinated coolant FC-40 and the specifications of Dow's modified silicone oil coolant ICL-1000 for data centers, as shown in the following table:

[0038] Project / Unit method mPAO FC40 ICL1000 <![CDATA[Liquid density / g / cm 3 > GB / T1884 0.738 1.85 0.86 Flash point – open cup method / ℃ GB / T3536 156 none 240 40℃ Kinematic viscosity / cSt GB / T265 3.3 2.2 26 Specific heat capacity at 40℃ / J / gK Internal DSC method 2.283 1.1 2.256 Dielectric constant GB / T5654 2.087 1.9 2.276 Pour point / ℃ GB / T3535 -84 -57 -52 Water solubility / ppm GB / T7600 ≤20 ≤7 110

[0039] Combined with the attached table, it can be concluded that the immersion coolant of the present application has the following advantages: excellent specific heat capacity (2.283J / g·K@40℃), which is higher than coolants such as fluorinated liquid, silicone oil, mineral oil, etc.; high oxidation resistance, low viscosity, low volatility, no hydrolysis, no sulfur, no aromatics, no corrosion, and the same life as the equipment; in addition, the immersion coolant of the present application also has the advantages of ODP (ozone depletion potential) = 0, GWP (global warming potential) close to 0, biodegradability, environmental protection and safety.

[0040] Among them, the heat dissipation method in this application is changed from no cooling of the power battery to immersion cooling of the power battery, and at the same time, it also avoids other cooling methods on the market. Air cooling, cold plate liquid cooling, glue injection cooling, etc. cannot completely solve the combustion and explosion of the battery. Because a more environmentally friendly and safe immersion coolant is used as the dielectric medium, the heat of the battery during operation can be greatly reduced, thereby increasing the battery life.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An immersion type battery vehicle power battery device, comprising a metal container (07), characterized in that: A sealing cover plate (05) is arranged at the top position of the metal container (07), and an external frame is arranged on the outer side of the top of the metal container (07); a first slot is opened on one side of the sealing cover plate (05), and a second power socket (04) is arranged on one side of the sealing cover plate (05) through the first slot; a lithium battery protection plate (06) and a plurality of battery structures are arranged below the sealing cover plate (05), and the lithium battery protection plate (06) and the plurality of battery structures are located inside the metal container (07); the battery structure includes a first plastic support frame (08) and a second plastic support frame (10) which are horizontally spaced and symmetrically distributed, and a battery pack (09) is arranged between the first plastic support frame (08) and the second plastic support frame (10).

2. The submerged battery vehicle power battery device according to claim 1, characterized in that: A plurality of battery packs (09) are linearly and evenly distributed between each group of the first plastic support frame (08) and the second plastic support frame (10), and a gap is left between each two adjacent battery packs (09).

3. The submerged battery device for electric battery vehicle according to claim 1, characterized in that: The metal container (07) is a prismatic hollow box structure, and the upper and lower parts of the inner side of the metal container (07) and the surrounding walls are padded with cushioning foam.

4. The submerged electric vehicle power battery device according to claim 1, characterized in that: The metal container (07) is filled with immersion cooling liquid, and the immersion cooling liquid covers the battery pack (09) or the lithium battery protection board (06).

5. The submerged electric vehicle power battery device according to claim 1, characterized in that: The external frame comprises a handle cover (02) arranged at the outer side of the top end of the metal container (07), a second slot hole is opened on one side end of the handle cover (02), and a first power socket (03) is arranged on one side end of the handle cover (02) through the second slot hole, and the top of the handle cover (02) is connected to the handle (01).

6. The submerged electric vehicle power battery device according to claim 5, characterized in that: The handle (01) is in the form of a round rod with a "mouth" shape, and the bottom end of the handle (01) is rotatably connected to the top of the handle cover (02) via a connecting seat, while a rubber cushion is fixedly sleeved on the outer wall at the top position of the handle (01).

Images