Immersed safe and environment-friendly lithium battery device

Abstract

The invention belongs to the technical field of lithium batteries, and discloses an immersed safe and environment-friendly lithium battery device which comprises a metal container, a sealing cover plate is arranged at the top of the metal container, and the outer wall of the bottom end of the sealing cover plate is fixedly sleeved with an upper edge; according to the application, the square lithium battery is immersed in the sealing cover plate and the metal container filled with the immersed cooling liquid, so that on one hand, oxygen in air can be isolated, and on the other hand, when one or more square lithium batteries are subjected to thermal runaway conditions such as extrusion, short circuit, needling, overcharge and overdischarge, the square lithium battery can be sealed; the immersed cooling liquid with high heat conductivity coefficient can quickly conduct heat to the outside of the container so as to cool each square lithium battery monomer in the battery pack, so that the temperature of each square lithium battery monomer is controlled, and the influence on the surrounding adjacent square lithium batteries caused by thermal runaway of one or more square lithium batteries is avoided; and the whole lithium battery device is further protected.

Description

Technical Field

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

[0002] Lithium-ion batteries, whether ternary lithium batteries, lithium iron phosphate batteries, lithium manganese oxide batteries and sodium ion batteries, all have thermal runaway phenomena, which can cause combustion, explosion and other phenomena. When conducting full-charge needle penetration tests on high-current batteries such as the above-mentioned ternary lithium batteries, lithium iron phosphate batteries, lithium manganese oxide batteries and sodium ion batteries, only a certain percentage of batteries can pass the needle penetration test. Therefore, new demands are also 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 thermal conductive adhesive wrapping. This type of thermal management method can only alleviate the heat dissipation problem of lithium battery packs, but cannot fundamentally and completely solve the thermal runaway and heat spread problems of lithium battery packs in various environments.

[0004] In order to solve the above problems, the present application provides an immersion-type safe and environmentally friendly lithium battery device. Summary of the invention

[0005] The present application provides an immersion-type safe and environmentally friendly lithium battery device that adopts the following technical solution: An immersion-type safe and environmentally friendly lithium battery device comprises a metal container, a sealing cover plate is arranged on the top of the metal container, an upper edge is fixedly sleeved on the outer wall of the bottom end of the sealing cover plate, a lower edge is alignedly arranged on the bottom of the upper edge, and the lower edge is fixedly sleeved on the outer wall of the top end of the metal container, a charging and discharging positive electrode interface, an external communication interface, and a charging and discharging negative electrode interface are respectively arranged on the upper side of the right end of the metal container, and the charging and discharging positive electrode interface, the external communication interface, and the charging and discharging negative electrode interface are linearly and spaced apart on one side of the metal container, and two fixing posts are fixedly installed on the outer surface of the upper side of the right end of the metal container in a spaced apart manner, and the two fixing posts are respectively located at the charging and discharging positive electrode interface, the charging and discharging negative electrode interface, and the charging and discharging positive electrode interface. The negative electrode interface of the discharge is opposite to the other side, and screw holes are provided in the center positions of the two fixing columns. Auxiliary components are provided on the outside of the positive electrode interface of the charge and discharge and the negative electrode interface of the charge and discharge. A square lithium battery is provided inside the metal container. A large current lithium battery safety protection plate and a water pump are provided on one side of the square lithium battery, and the large current lithium battery safety protection plate and the water pump are both located inside the side of the metal container close to the auxiliary components. The first plastic bracket and the second plastic bracket are respectively clamped at the upper and lower ends of the square lithium battery, and the first plastic bracket and the second plastic bracket are both installed inside the metal container. The inside of the metal container is provided with immersion coolant.

[0006] Through the above technical solution, the water pump is reserved and, when used in areas below minus 20°C in winter, it cooperates with the heating film to heat the immersion coolant.

[0007] Furthermore, a sealing belt is provided between the upper edge and the lower edge, and the sealing belt is bonded to the upper edge and the lower edge by dispensing glue.

[0008] Through the above technical solution, the sealing belt can improve the contact sealing effect between the upper edge and the lower edge.

[0009] Furthermore, the connection between the upper edge and the lower edge is in a rectangular shape and has a plurality of mounting holes, and the connection between the upper edge and the lower edge is threadedly mounted with a first screw through the plurality of mounting holes.

[0010] Through the above technical solution, the first screw realizes the fixing and assembling function between the upper edge and the lower edge.

[0011] Furthermore, a plurality of the square lithium batteries are arranged inside the metal container, and the plurality of the square lithium batteries together constitute a battery pack, and the plurality of the square lithium batteries are linearly and evenly distributed with gaps.

[0012] Furthermore, the metal container is designed in a rectangular box-shaped structure, and the inner walls around the metal container are padded with cushioning foam.

[0013] Through the above technical solution, the cushioning foam achieves a cushioning and protective effect around the inner wall of the metal container.

[0014] Furthermore, the immersion coolant is composed of one of ultra-low viscosity polyalphaolefin mPAO obtained by metallocene polymerization, low viscosity polyalphaolefin PAO, low viscosity GTL coolant, low viscosity CTL coolant, silicone oil and fluorinated liquid, and the components of the immersion coolant include basic coolant, modified nano-insulating heat-conducting fluid and several functional additives.

[0015] Furthermore, the base coolant is composed of ultra-low viscosity polyalphaolefin with a kinematic viscosity of 2cst-10cst and high viscosity polyalphaolefin with a kinematic viscosity of 40cst-300cst, and the functional additives include at least one of an antioxidant, a corrosion inhibitor, an antifoaming agent, a rust inhibitor and a dispersant.

[0016] Through the above technical solution, under the limitation of the immersion coolant material, the stable performance of the overall lithium battery during use can be effectively guaranteed.

[0017] Furthermore, the auxiliary component includes a rectangular frame that is sleeved on the outside of the positive charging and discharging interface, the external communication interface, and the negative charging and discharging interface. The rectangular frame is located on the right outer surface of the metal container, and extension feet are fixedly installed on the outer surfaces of both sides of the rectangular frame. The inner cavities of the two extension feet are screwed with second screws, and the two extension feet are screwed and installed with the screw holes on the two fixing columns through the second screws.

[0018] Through the above technical solution, the extended feet and the second screws realize the fixed installation function of the rectangular frame.

[0019] Furthermore, the auxiliary component also includes an upper rotating plate and a lower rotating plate located on an end face of the rectangular frame facing away from the metal container, the upper rotating plate and the lower rotating plate are distributed up and down and in a gap manner, and the opposite sides of the upper rotating plate and the lower rotating plate are rotatably connected to the outer end of one side of the rectangular frame, three circular holes are linearly and evenly opened on the opposite sides of the upper rotating plate and the lower rotating plate, and lock buckles are installed on one end face on both sides of the middle part of the upper rotating plate and the lower rotating plate, the three circular holes and the two lock buckles are linearly staggered, and a foam pad is clamped inside one side of the rectangular frame.

[0020] Through the above technical solution, the lock facilitates the opening and closing operations of the upper rotating plate and the lower rotating plate.

[0021] Furthermore, one end surface of the foam pad abuts against the same side of the upper rotating plate and the lower rotating plate, and one end surface of the foam pad is embedded with two grooves, and the other end surface of the foam pad abuts against the plug-in port on one side of the positive charging and discharging interface and the negative charging and discharging interface.

[0022] Through the above technical solution, the foam gasket protects the positive charging and discharging interface, the external communication interface, and the negative charging and discharging interface plug-in port, while achieving a sealed isolation effect between the three and the air.

[0023] In summary, this application includes the following beneficial technical effects: The present application immerses the square lithium battery in a sealed cover plate and a metal container filled with immersion coolant, which can isolate oxygen in the air on the one hand, and on the other hand, when a single or multiple square lithium batteries are in thermal runaway conditions such as extrusion, short circuit, puncture, overcharge, over-discharge, etc., the immersion coolant with high thermal conductivity will quickly conduct heat to the outside of the container to cool each square lithium battery cell in the battery pack, so that the temperature of the square lithium battery cell is controlled, and thermal runaway of a single or multiple square lithium batteries is avoided, which affects the surrounding adjacent square lithium batteries, thereby protecting the entire lithium battery device, and can extend the overall service life and increase the use time; The present application uses auxiliary components arranged on the outer sides of the positive charging and discharging interface, the external communication interface, and the negative charging and discharging interface to achieve fixed assembly on the right outer surface of the metal container by utilizing the combined effects of the internal rectangular frame, the upper rotating plate, the lower rotating plate, the circular hole, the lock buckle, the foam pad, the extension foot, and the second screw. Before the overall lithium battery device is not used, it can play a covering and protective role on the outer sides of the positive charging and discharging interface, the external communication interface, and the negative charging and discharging interface, thereby preventing them from being accidentally damaged and rusted. In addition, during the use of the overall lithium battery device, it can limit the connected connectors on the outer sides of the positive charging and discharging interface, the external communication interface, and the negative charging and discharging interface, thereby preventing the connected connectors from being accidentally loosened. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is one of the overall structural diagrams of this application; Figure 2 This is the second schematic diagram of the overall structure of this application; Figure 3 For this application Figure 2 Enlarged view of point A in the middle; Figure 4 It is an overall internal cross-sectional view of the present application; Figure 5 It is a schematic diagram of the local structure of this application; Figure 6 This is a partial semi-exploded view of this application.

[0025] Description of the numbers in the figure: 101. Charge and discharge positive electrode interface; 102. External communication interface; 103. Charge and discharge negative electrode interface; 104. Sealing cover; 105. First screw; 106. Metal container; 107. Upper edge; 108. Lower edge; 109. Fixing column; 201. Immersion coolant; 202. First plastic bracket; 203. Second plastic bracket; 301. Square lithium battery; 302. High current lithium battery safety protection board; 303. Water pump; 4. Auxiliary components; 401. Rectangular frame; 402. Upper rotating plate; 403. Lower rotating plate; 404. Circular hole; 405. Lock; 406. Foam pad; 407. Extension foot; 408. Second screw. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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. Example

[0029] The present application discloses an immersion-type safe and environmentally friendly lithium battery device. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6, including a metal container 106, a sealing cover plate 104 is arranged on the top of the metal container 106, an upper edge 107 is fixedly sleeved on the outer wall of the bottom end of the sealing cover plate 104, a lower edge 108 is aligned at the bottom of the upper edge 107, and the lower edge 108 is fixedly sleeved on the outer wall of the top end of the metal container 106, a charging and discharging positive electrode interface 101, an external communication interface 102, and a charging and discharging negative electrode interface 103 are respectively arranged on the upper side of the right end of the metal container 106, and the charging and discharging positive electrode interface 101, the external communication interface 102, and the charging and discharging negative electrode interface 103 are linearly and spaced on one side of the metal container 106, and two fixing columns 109 are fixedly installed on the upper outer surface of the right end of the metal container 106 in a spaced manner, and the two fixing columns 109 are respectively located at the charging and discharging positive electrode interface 101 and the charging and discharging negative electrode interface 103. 03, and screw holes are provided through the center positions of the two fixing columns 109, and the outer sides of the positive charging and discharging interface 101 and the negative charging and discharging interface 103 are jointly provided with an auxiliary component 4, and a square lithium battery 301 is arranged inside the metal container 106, and a large current lithium battery safety protection plate 302 and a water pump 303 are respectively arranged on one side of the square lithium battery 301, and the large current lithium battery safety protection plate 302 and the water pump 303 are both located inside the side of the metal container 106 close to the auxiliary component 4, and the upper and lower ends of the square lithium battery 301 are respectively clamped with a first plastic bracket 202 and a second plastic bracket 203, and the first plastic bracket 202 and the second plastic bracket 203 are both installed inside the metal container 106, and the metal container 106 is provided with an immersion coolant 201.

[0030] A sealing belt is provided between the upper edge 107 and the lower edge 108, and the sealing belt is bonded to the upper edge 107 and the lower edge 108 by dispensing glue. The connection between the upper edge 107 and the lower edge 108 is rectangular and has a plurality of mounting holes, and the first screw 105 is screwedly installed at the connection between the upper edge 107 and the lower edge 108 through the plurality of mounting holes.

[0031] A plurality of square lithium batteries 301 are arranged inside the metal container 106 , and the plurality of square lithium batteries 301 together constitute a battery pack, and the plurality of square lithium batteries 301 are linearly evenly and intermittently distributed. The metal container 106 is designed in a rectangular box-shaped structure, and the inner walls of the metal container 106 are padded with buffer foam.

[0032] The immersion coolant 201 is composed of one of ultra-low viscosity polyalphaolefin mPAO obtained by metallocene polymerization, low viscosity polyalphaolefin PAO, low viscosity GTL coolant, low viscosity CTL coolant, silicone oil and fluorinated liquid, and the components of the immersion coolant 201 include basic coolant, modified nano-insulating heat-conducting fluid and several functional additives. The basic coolant is composed of ultra-low viscosity polyalphaolefin with a kinematic viscosity of 2cst-10cst and high viscosity polyalphaolefin with a kinematic viscosity of 40cst-300cst, and the several functional additives include at least one of antioxidants, corrosion inhibitors, antifoaming agents, rust inhibitors and dispersants.

[0033] The auxiliary component 4 includes a rectangular frame 401 which is sleeved on the outside of the positive charging and discharging interface 101, the external communication interface 102, and the negative charging and discharging interface 103. The rectangular frame 401 is located on the right outer surface of the metal container 106, and the outer surfaces of both sides of the rectangular frame 401 are fixedly installed with extension feet 407. The inner cavities of the two extension feet 407 are screwed with second screws 408, and the two extension feet 407 are screwed and installed with the screw holes on the two fixing columns 109 through the second screws 408.

[0034] The auxiliary component 4 also includes an upper rotating plate 402 and a lower rotating plate 403 located on one end of the rectangular frame 401 facing away from the metal container 106. The upper rotating plate 402 and the lower rotating plate 403 are arranged in an up-down and gap-like manner, and the opposite sides of the upper rotating plate 402 and the lower rotating plate 403 are rotatably connected to the outer end of one side of the rectangular frame 401. The opposite sides of the upper rotating plate 402 and the lower rotating plate 403 are linearly and uniformly provided with three circular holes 404. The end surfaces are all installed with lock buckles 405, the three circular holes 404 and the two lock buckles 405 are linearly staggered, and a foam pad 406 is installed inside one side of the rectangular frame 401. One end surface of the foam pad 406 abuts against the same side of the upper rotating plate 402 and the lower rotating plate 403, and two grooves are embedded in one end surface of the foam pad 406. The other end surface of the foam pad 406 abuts against the plug-in port on one side of the positive charging and discharging interface 101 and the negative charging and discharging interface 103.

[0035] Among them, after the lithium battery is produced, the single 18650 cylindrical ternary lithium battery needs to undergo needle puncture test, short circuit test and heating test.

[0036] Acupuncture experiment: At an ambient temperature of 24°C, pour about 200 ml of coolant into a container to immerse the lithium battery. Use a 18650 ternary lithium battery for a puncture test. During the puncture, bubbles and flames are generated, and the coolant temperature rises by about 3°C. After ten minutes of puncture, take out the 18650 battery, and the battery is slightly hot.

[0037] Experimental results: Immersing ternary lithium batteries can prevent the battery from burning and exploding due to needle puncture, and the temperature rise is limited.

[0038] Short circuit test: At an ambient temperature of 24°C, pour about 200ml of coolant into a container to immerse the lithium battery, and use a 18650 ternary lithium battery to conduct a short-circuit experiment; during the short-circuit process, no bubbles or flames are generated, and the coolant temperature rises by about 4°C; after 5 minutes of short-circuiting, the coolant temperature rise is basically fixed, and the temperature of the external short-circuit copper wire is 100°C; after 20 minutes of short-circuiting, disassemble the short-circuit, take the battery out of the coolant, and the battery is slightly hot.

[0039] Experimental results: Immersing ternary lithium batteries can prevent combustion and explosion caused by short circuits, and the temperature rise is limited.

[0040] Heating experiment: At an ambient temperature of 24°C, pour about 200 ml of coolant into a container to immerse the lithium battery. Use a 18650 ternary lithium battery for a heating experiment. After heating to 180°C, stop. After waiting for the coolant to cool, take out the lithium battery, and the battery appearance remains intact.

[0041] Experimental results: Immersing ternary lithium batteries can prevent combustion and explosion caused by thermal runaway.

[0042] Secondly, the large-capacity square lithium battery 301 in the embodiment is subjected to a needle puncture test, a short circuit test and a heating test.

[0043] Acupuncture experiment: At an ambient temperature of 24°C, pour about 2L of coolant into a container, immerse the lithium battery, and use a square lithium battery for a puncture test. During the puncture, bubbles and flames are generated, and the coolant temperature rises by about 20°C. After ten minutes of puncture, take out the square lithium battery, and the battery is slightly hot.

[0044] Experimental results: Immersing the square lithium battery 301 can prevent the battery from burning and exploding due to needle puncture, and the temperature rise is limited.

[0045] Short circuit test: At an ambient temperature of 24°C, pour about 2L of coolant into a container, immerse the lithium battery, and use a square lithium battery to conduct a short-circuit test; during the short-circuit process, no bubbles or flames are generated, and the coolant temperature rises by about 5°C; the coolant temperature rise is limited, and the external short-circuit copper wire melts; take the lithium battery out of the coolant, and the battery is slightly hot.

[0046] Experimental results: Immersing the square lithium battery 301 can prevent the battery from burning and exploding due to short circuit, and the temperature rise is limited.

[0047] Heating experiment: At an ambient temperature of 24°C, pour about 2L of coolant into a container to immerse the lithium battery. Use a square large-capacity ternary lithium battery for a heating experiment. After heating to 180°C, stop. After waiting for the coolant to cool, take out the lithium battery. The battery appearance remains intact, and the electrolyte leaks out.

[0048] Experimental results: Immersing the square lithium battery 301 can prevent the battery from burning and exploding due to thermal runaway.

[0049] The parameters of the mPAO immersion coolant 201 used in this application are compared with the product specifications of 3M's fluorinated coolant FC-40 and the specifications of Dow's modified silicone oil coolant for data centers ICL-1000 as shown in the table below: Project / Unit method mPAO FC40 ICL1000 Liquid density / g / cm³ GB / T1884 0.738 1.85 0.86 Flash point – open cup method / ℃ GB / T3536 156 none 240 Kinematic viscosity at 40°C / cSt GB / T265 3.3 2.2 26 Specific heat capacity at 40°C / 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 Combined with the above table, it can be concluded that the immersion coolant 201 in this application has the following advantages: 1. Excellent specific heat capacity (2.283J / g·K@40℃), which is higher than coolants such as fluorinated liquid, silicone oil, and mineral oil; 2. 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 in this application also has ODP (ozone depletion potential) = 0, GWP (global warming potential) is close to 0, and meets the carbon neutrality standard; it is biodegradable and environmentally friendly and safe.

[0050] In summary, the heat dissipation method of the present application is changed from no cooling for various lithium battery packs to immersion single-phase cooling of lithium batteries. It is generally believed that immersion liquid cooling is 1000~3000 times that of traditional cooling. At the same time, it also avoids other cooling methods on the market. Air cooling, cold plate liquid cooling, glue filling cooling, flame retardant sheet pasting, etc. cannot completely solve the combustion and explosion phenomena of various lithium batteries. Since a more environmentally friendly and safe immersion coolant is used as the dielectric medium, the heat generated during the operation of the lithium battery can be greatly reduced, thereby increasing the service life of the lithium battery.

[0051] The implementation principle of the embodiment of the present application is as follows: the whole lithium battery is in a fully assembled production state, so that before it is used, the rectangular frame 401 needs to be integrally mounted on the outer sides of the charge and discharge positive electrode interface 101, the external communication interface 102, and the charge and discharge negative electrode interface 103, and the extension legs 407 and the second screws 408 on both sides thereof are connected and fixedly assembled with the two fixing columns 109 and the screw holes, and at this time, the foam pad 406 is pressed against one side of the upper rotating plate 402 and the lower rotating plate 403, so as to achieve the isolation protection of the charge and discharge positive electrode interface 101, the external communication interface 102, and the charge and discharge negative electrode interface 103, thereby preventing the three from being accidentally damaged by collision and rusted by moisture; When the positive charging and discharging interface 101, the external communication interface 102, and the negative charging and discharging interface 103 are plugged into external connectors, the two lock buckles 405 can be used to rotate and open the upper rotating plate 402 and the lower rotating plate 403. At this time, the upper and lower parts of each circular hole 404 are separated, and then the inside of the rectangular frame 401 is extracted by using the two grooves on one side of the foam pad 406. After that, after the corresponding connectors are plugged in, the upper rotating plate 402 and the lower rotating plate 403 are rotated in turn, so that the wire body part connected to each connector is bound in each circular hole 404, and the two lock buckles 405 are buckled and reset, so as to achieve the limiting effect on each connector and prevent it from loosening during connection and use.

[0052] 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 safe and environmentally friendly lithium battery device, comprising a metal container (106), characterized in that: A sealing cover plate (104) is provided on the top of the metal container (106); an upper edge (107) is fixedly sleeved on the outer wall of the bottom end of the sealing cover plate (104); a lower edge (108) is aligned with the bottom of the upper edge (107); and the lower edge (108) is fixedly sleeved on the outer wall of the top end of the metal container (106); a charging and discharging positive electrode interface (101), an external communication interface (102), and a charging and discharging negative electrode interface (103) are respectively provided on the upper side of the right end of the metal container (106); and the charging and discharging positive electrode interface (101), the external communication interface (102), and the charging and discharging negative electrode interface (103) are linearly and spaced apart on one side of the metal container (106); and two fixing columns (109) are fixedly installed on the upper outer surface of the right end of the metal container (106) in a spaced apart manner; the two fixing columns (109) are respectively located on the opposite sides of the charging and discharging positive electrode interface (101) and the charging and discharging negative electrode interface (103). A side edge and screw holes are provided in the center positions of the two fixing columns (109); the outsides of the charging and discharging positive electrode interface (101) and the charging and discharging negative electrode interface (103) are provided with auxiliary components (4); a square lithium battery (301) is provided inside the metal container (106); a high-current lithium battery safety protection board (302) and a water pump (303) are provided on one side edge of the square lithium battery (301); the high-current lithium battery safety protection board (302) and the water pump (303) are both located inside the side of the metal container (106) close to the auxiliary components (4); the upper and lower ends of the square lithium battery (301) are respectively clamped with a first plastic bracket (202) and a second plastic bracket (203); the first plastic bracket (202) and the second plastic bracket (203) are both installed inside the metal container (106); and the metal container (106) is provided with an immersion cooling liquid (201).

2. The immersion-type safe and environmentally friendly lithium battery device according to claim 1, characterized in that: A sealing belt is provided between the upper edge (107) and the lower edge (108), and the sealing belt is bonded to the upper edge (107) and the lower edge (108) by glue dispensing.

3. The immersion-type safe and environmentally friendly lithium battery device according to claim 1, characterized in that: The connection between the upper edge (107) and the lower edge (108) is in a rectangular shape and is provided with a plurality of mounting holes. The connection between the upper edge (107) and the lower edge (108) is screwed with a first screw (105) through the plurality of mounting holes.

4. The immersion-type safe and environmentally friendly lithium battery device according to claim 1, characterized in that: A plurality of the square lithium batteries (301) are arranged inside the metal container (106), the plurality of square lithium batteries (301) together form a battery pack, and the plurality of square lithium batteries (301) are linearly and evenly distributed with gaps.

5. The immersion-type safe and environmentally friendly lithium battery device according to claim 1, characterized in that: The metal container (106) is designed as a rectangular box-shaped structure, and the inner walls around the metal container (106) are padded with cushioning foam.

6. The immersion-type safe and environmentally friendly lithium battery device according to claim 1, characterized in that: The immersion coolant (201) is composed of one of ultra-low viscosity polyalphaolefin mPAO obtained by metallocene polymerization, low viscosity polyalphaolefin PAO, low viscosity GTL coolant, low viscosity CTL coolant, silicone oil and fluorinated liquid, and the components of the immersion coolant (201) include basic coolant, modified nano-insulated heat-conducting fluid and a number of functional additives.

7. The immersion-type safe and environmentally friendly lithium battery device according to claim 6, characterized in that: The basic coolant is composed of ultra-low viscosity polyalphaolefin with a kinematic viscosity of 2cst-10cst and high viscosity polyalphaolefin with a kinematic viscosity of 40cst-300cst, and the functional additives include at least one of an antioxidant, a corrosion inhibitor, an antifoaming agent, a rust inhibitor and a dispersant.

8. The immersion-type safe and environmentally friendly lithium battery device according to claim 1, characterized in that: The auxiliary component (4) comprises a rectangular frame (401) sleeved on the outside of the charge and discharge positive electrode interface (101), the external communication interface (102), and the charge and discharge negative electrode interface (103); the rectangular frame (401) is located on the right outer surface of the metal container (106), and extension legs (407) are fixedly installed on the outer surfaces of both sides of the rectangular frame (401); the inner cavities of the two extension legs (407) are screwed with second screws (408), and the two extension legs (407) are screwed and installed with screw holes on the two fixing columns (109) through the second screws (408).

9. The immersion-type safe and environmentally friendly lithium battery device according to claim 8, characterized in that: The auxiliary component (4) further comprises an upper rotating plate (402) and a lower rotating plate (403) located on an end surface of the rectangular frame (401) facing away from the metal container (106); the upper rotating plate (402) and the lower rotating plate (403) are arranged in an up-and-down manner and in a gap manner; the opposite sides of the upper rotating plate (402) and the lower rotating plate (403) are rotatably connected to the outer end of one side of the rectangular frame (401); three circular holes (404) are linearly and uniformly formed on the opposite sides of the upper rotating plate (402) and the lower rotating plate (403); and lock buckles (405) are installed on the end surfaces on both sides of the middle of the upper rotating plate (402) and the lower rotating plate (403); the three circular holes (404) and the two lock buckles (405) are linearly and staggeredly distributed; and a foam pad (406) is mounted inside one side of the rectangular frame (401).

10. The immersion-type safe and environmentally friendly lithium battery device according to claim 9, characterized in that: One end surface of the foam pad (406) abuts against the same side of the upper rotating plate (402) and the lower rotating plate (403), and one end surface of the foam pad (406) is embedded with two grooves, and the other end surface of the foam pad (406) abuts against the plug-in port on one side of the charging and discharging positive electrode interface (101) and the charging and discharging negative electrode interface (103).

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