Lithium battery module with thermal runaway prevention

Abstract

The application discloses a lithium battery module with heat runaway prevention performance, and mainly solves the problem of possible heat runaway of the lithium battery module during use. The lithium battery module comprises a liquid cooling plate, a protective shell, side stainless steel fireproof plates arranged inside and outside the protective shell, and heat dissipation fins, the protective shell is further provided with heat dissipation grooves for placing the side stainless steel heat dissipation fins, upper and lower sealing mechanisms arranged on the upper and lower sides of the lithium battery, and follow-up mechanisms arranged between the upper and lower sealing mechanisms and the corresponding side stainless steel heat dissipation fins; meanwhile, heat runaway adsorption mechanisms are arranged between the two side stainless steel heat dissipation fins on the horizontal line. Once the lithium battery is overheated and burns, the side stainless steel heat dissipation fins, the side stainless steel fireproof plates and the upper and lower sealing mechanisms will realize all-around sealing of the lithium battery, so that structural damage of the lithium battery module caused by the overheated burning is avoided. The lithium battery module has the characteristics of good protection performance and strong heat runaway prevention performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery module with anti-thermal runaway performance. Background Art

[0002] With the widespread use of lithium-ion batteries in mobile electronic devices, electric vehicles, and other fields, preventing safety issues such as thermal runaway and explosion has become increasingly important. Lithium-ion battery modules are composed of multiple lithium-ion cells, and thermal runaway can lead to serious consequences such as gas explosions and structural failure within the module.

[0003] Patent No. 201921623027.0 discloses a lithium-ion battery module for preventing thermal runaway, which consists of a cold plate, a liquid thermal pad fixed on the top of the cold plate, multiple battery cells fixed on the liquid thermal pad at equal intervals, a fireproof layer fixed on the liquid thermal pad and located between adjacent battery cells and composed of an inter-cell fireproof layer and a phase change material, end plate side fireproof layers and side plate fireproof layers located at the ends and sides of multiple battery cells, and a module upper cover plate and end plate located outside the end plate side fireproof layer and the side plate fireproof layer. It has good protection effect and good thermal runaway prevention performance.

[0004] However, the inventors of the present application discovered that, in order to facilitate heat dissipation of the lithium-ion battery module, the above-mentioned existing lithium-ion battery module does not have a protective structure on the liquid thermal pad and the cold plate. As a result, when the lithium-ion battery module thermally runs away, the liquid thermal pad and the cold plate will be damaged. In severe cases, the liquid thermal pad may even affect other lithium-ion batteries that have not thermally run away, thereby affecting the stability and safety of the entire lithium battery module. The thermal runaway protection performance needs to be improved.

[0005] Therefore, it is necessary to develop a method that can effectively protect lithium battery modules and improve the thermal runaway resistance of lithium battery modules. Summary of the Invention

[0006] In order to solve the problems raised in the above background technology, the present invention provides a lithium battery module with thermal runaway resistance, which has the characteristics of improving the thermal runaway resistance of the lithium battery module.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A lithium battery module with thermal runaway prevention performance comprises: a liquid cooling plate, a protective shell fixedly connected to the top of the liquid cooling plate, a battery cavity with an upper end opening defined within the protective shell, a lithium battery placement opening communicating between the liquid cooling plate and the battery cavity defined at the bottom of the protective shell, a lithium battery placed within the battery cavity, the lithium battery being limited by the lithium battery placement opening and having its bottom end passing through the lithium battery placement opening to contact the liquid cooling plate, side stainless steel fireproof plates placed within the battery cavity at the four corners outside the lithium battery, heat dissipation grooves defined on the protective shell at the four corners outside the lithium battery, side stainless steel heat dissipation fins placed within the heat dissipation grooves, and a plurality of the side stainless steel fireproof plates fixedly connected to the corresponding side stainless steel heat dissipation fins;

[0009] An overheating runaway adsorption mechanism is installed between the side stainless steel heat dissipation fins and the protective shell. Hidden grooves are respectively provided on both sides of the lithium battery placement port at the bottom end of the protective shell and at corresponding positions on the top end of the protective shell. A top stainless steel fireproof plate is placed inside the hidden groove at the top, and a bottom stainless steel fireproof plate is placed inside the hidden groove at the bottom. A follow-up mechanism is installed between the multiple top stainless steel fireproof plates and bottom stainless steel fireproof plates and the corresponding side stainless steel heat dissipation fins and the protective shell. A protective cover plate is fixedly connected with bolts at the top end of the protective shell. Smoke sensors are respectively embedded in the protective cover plate at the corresponding lithium battery positions. The lithium battery, overheating runaway adsorption mechanism and smoke sensor are connected to the control system and power supply system wires of the lithium battery module.

[0010] Preferably, the lithium battery is in the shape of a square platform, and the two bottom stainless steel fireproof plates corresponding to the lithium battery are in the shape of a wedge that matches the lithium battery.

[0011] Preferably, the overheating runaway adsorption mechanism includes an electromagnet and an iron bar respectively fixed to the side walls of the stainless steel heat dissipating fins on both sides of the horizontal line close to each other, and the electromagnet is connected to the control system and power supply system wires of the lithium battery module.

[0012] Preferably, the overheating runaway adsorption mechanism also includes an auxiliary sliding mechanism assembled between the side stainless steel heat dissipation fins and the protective shell, the auxiliary sliding mechanism includes two movable grooves symmetrically opened on the protective shell along the side stainless steel heat dissipation fins and two movable blocks symmetrically fixed to the side stainless steel heat dissipation fins, a movable rod is fixed inside the movable groove, the movable block is slidably connected to the movable rod, and the movable rod is provided with a first connecting spring whose two ends are respectively fixed to the corresponding side walls of the movable block and the movable groove.

[0013] Preferably, a sliding hole is provided on the movable block at a position corresponding to the movable rod, and the movable block is sleeved on the movable rod through the sliding hole to achieve a sliding connection with the movable rod.

[0014] Preferably, the follower mechanism includes racks respectively fixed to the upper and lower ends of the follower side stainless steel heat dissipation fins and double-headed counter-rotating screws placed inside the follower heat dissipation groove and located above and below the two racks respectively. One end of the double-headed counter-rotating screw is connected to the inner wall of the protective shell through a bearing, and the other end of the double-headed counter-rotating screw penetrates the protective shell and extends to the corresponding hidden groove on one side, the lithium battery placement port and the hidden groove on the other side are connected to the inner wall of the protective shell through bearings. The double-headed counter-rotating screw is connected to the through section of the protective shell through a bearing, and the corresponding two bottom stainless steel fireproof plates are transmission-connected to the double-headed counter-rotating screw through a transmission nut. Gears that mesh with the corresponding side racks are fixedly sleeved on the two double-headed counter-rotating screws located inside the heat dissipation groove.

[0015] Preferably, four diffusion grooves that are not connected to the battery cavity are symmetrically opened on the protective shell along the heat dissipation groove.

[0016] Preferably, a flame-retardant gas cavity is opened inside the side stainless steel fireproof plate, and an overheating runaway fire extinguishing trigger mechanism is installed between the side stainless steel fireproof plate and the corresponding lithium battery. The overheating runaway fire extinguishing trigger mechanism includes an abutment rod fixedly connected to the lithium battery and an air outlet opened on the side stainless steel fireproof plate facing the side wall of the lithium battery, a closing plate is placed inside the air outlet, and a second connecting spring is elastically connected between the closing plate away from the side wall of the abutment rod and the inner wall of the flame-retardant gas cavity.

[0017] Preferably, the air outlet is in a T-shaped circle, and the diameter of the closing plate is smaller than the diameter of the large circle and larger than the diameter of the small circle.

[0018] Preferably, a curved cooling channel is provided on the surface of the liquid cooling plate, and the liquid cooling plate includes an aerogel layer, and a first silicone foam layer and a second silicone foam layer are respectively provided on both side surfaces of the aerogel layer; a first glass fiber layer is provided on the outer surface of the first silicone foam layer, and a first thermal conductive metal layer is provided on the outer surface of the first glass fiber layer; a second glass fiber layer is provided on the outer surface of the second silicone foam layer, and a second thermal conductive metal layer is provided on the outer surface of the second glass fiber layer.

[0019] Preferably, the first silicone foam layer and the second silicone foam layer are both ceramic liquid foamed silicone, and the first silicone foam layer and the second silicone foam layer will be ceramicized at ≥500°C, and the fire-resistant temperature is ≥1300°C.

[0020] Preferably, a phase change material heat dissipation layer is provided on the surface of the side stainless steel heat dissipation fins, and the phase change material heat dissipation layer is polyethylene glycol with an average relative molecular mass of 1050.

[0021] Preferably, the surface of the side stainless steel heat dissipating fin is further provided with a graphene heat conducting layer, and the thermal conductivity of the graphene heat conducting layer is 4000 W / (m*K).

[0022] Preferably, the phase change material heat dissipation layer is arranged in a meandering structure around the surface of the side stainless steel heat dissipation fin and forms a first meandering structure, and the graphene thermal conductive layer is arranged in a meandering structure around the surface of the side stainless steel heat dissipation fin and forms a second meandering structure embedded with the first meandering structure, and the thickness of the phase change material heat dissipation layer and the graphene thermal conductive layer are the same and are on the same horizontal plane.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] 1. In the protective shell of the present invention, side stainless steel fireproof plates are arranged on the four sides corresponding to the outside of the lithium battery. Heat dissipation grooves with side stainless steel heat dissipation fins are arranged on the four sides corresponding to the outside of the lithium battery. The side stainless steel fireproof plates are fixedly connected to the side stainless steel heat dissipation fins. An overheating runaway adsorption mechanism is arranged on the side stainless steel heat dissipation fins between two horizontal lines. At the same time, upper and lower closing mechanisms are arranged on the upper and lower sides of the lithium battery inside the protective shell. A follow-up mechanism is arranged between the upper and lower closing mechanisms and the corresponding side stainless steel heat dissipation fins. That is, when the smoke sensor senses overheating and combustion of the lithium battery, the side stainless steel heat dissipation fins, the side stainless steel fireproof plates and the upper and lower closing mechanisms can be simultaneously linked to achieve all-round sealing of the lithium battery, thereby avoiding damage to the lithium battery module and the external structure of the lithium battery due to overheating and combustion, and having good anti-thermal runaway performance.

[0025] 2. The present invention incorporates a flame-retardant gas chamber filled with flame-retardant gas within the stainless steel fireproof panel, along with an abutment release mechanism. Furthermore, a corresponding abutment mechanism is provided on the lithium battery. This allows the flame-retardant gas to rapidly expand the fire within a closed environment, further enhancing the thermal runaway resistance of the lithium battery module. Consequently, the present invention provides excellent protection and strong thermal runaway resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of the present invention;

[0027] Figure 2 It is a cross-sectional view of the present invention;

[0028] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 For the present invention Figure 2 Schematic diagram of thermal runaway prevention state;

[0030] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0031] Figure 6 For the present invention Figure 4 vertical section;

[0032] Figure 7 It is a vertical cross-sectional view of the present invention;

[0033] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle.

[0034] In the figure: 1. Liquid cooling plate; 2. Protective shell; 3. Protective cover; 4. Smoke sensor; 5. Lithium battery; 6. Electromagnet; 7. Heat dissipation groove; 8. Side stainless steel fireproof plate; 9. Side stainless steel heat dissipation fins; 10. Battery cavity; 11. Iron bar; 12. Movable groove; 13. Movable rod; 14. First connecting spring; 15. Movable block; 16. Flame-retardant gas cavity; 17. Second connecting spring; 18. Closing plate; 19. Abutment rod; 20. Air outlet; 21. Hidden groove; 22. Bottom stainless steel fireproof plate; 23. Top stainless steel fireproof plate; 24. Rack; 25. Gear; 26. Double-headed counter-rotating screw; 27. Lithium battery placement port. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1

[0037] See also Figures 1-8The present invention provides a lithium battery module with thermal runaway prevention performance, comprising: a liquid cooling plate 1, a protective shell 2 fixedly connected to the top of the liquid cooling plate 1, a battery cavity 10 with an upper end opening is provided inside the protective shell 2, a lithium battery placement port 27 connecting the liquid cooling plate 1 and the battery cavity 10 is provided at the bottom of the protective shell 2, a lithium battery 5 is placed inside the battery cavity 10, the lithium battery 5 is limited by the lithium battery placement port 27 and the bottom end passes through the lithium battery placement port 27 to contact the liquid cooling plate 1, side stainless steel fireproof plates 8 are respectively placed on the outside of the four corners of the lithium battery 5 inside the battery cavity 10, heat dissipation grooves 7 are respectively provided on the outside of the four corners of the lithium battery 5 on the protective shell 2, side stainless steel heat dissipation fins 9 are placed inside the heat dissipation grooves 7, and multiple side stainless steel fireproof plates 8 are fixed to the corresponding side stainless steel heat dissipation fins 9 An overheating runaway adsorption mechanism is installed between the side stainless steel heat dissipation fins 9 and the protective shell 2. Hidden grooves 21 are respectively provided at the bottom of the protective shell 2 on both sides of the lithium battery placement port 27 and at the corresponding positions at the top of the protective shell 2. A top stainless steel fireproof plate 23 is placed inside the top hidden groove 21, and a bottom stainless steel fireproof plate 22 is placed inside the bottom hidden groove 21. A follow-up mechanism is installed between the multiple top stainless steel fireproof plates 23 and bottom stainless steel fireproof plates 22 and the corresponding side stainless steel heat dissipation fins 9 and the protective shell 2. A protective cover plate 3 is bolted to the top of the protective shell 2. Smoke sensors 4 are embedded in the protective cover plate 3 at the positions corresponding to the lithium batteries 5. The lithium batteries 5, the overheating runaway adsorption mechanism and the smoke sensors 4 are connected to the control system and power supply system of the lithium battery module through wires. Among them, the control system and power supply system of the lithium battery module belong to the existing technology and will not be described here.

[0038] In this embodiment, the lithium battery 5 is in a square platform shape, and the two bottom stainless steel fireproof plates 22 corresponding to the lithium battery 5 are in a wedge shape that matches the lithium battery 5.

[0039] In this embodiment, the overheating adsorption mechanism includes an electromagnet 6 and an iron bar 11 respectively fixed to the side walls of the stainless steel heat dissipation fins 9 on both sides of the horizontal line close to each other. The electromagnet 6 is connected to the control system and power supply system wires of the lithium battery module.

[0040] In this embodiment, the overheating runaway adsorption mechanism also includes an auxiliary sliding mechanism assembled between the side stainless steel heat dissipating fins 9 and the protective shell 2. The auxiliary sliding mechanism includes two movable grooves 12 symmetrically opened on the protective shell 2 along the side stainless steel heat dissipating fins 9 and two movable blocks 15 symmetrically fixed on the side stainless steel heat dissipating fins 9. A movable rod 13 is fixed inside the movable groove 12. The movable block 15 is slidably connected to the movable rod 13. The movable rod 13 is provided with a first connecting spring 14 whose two ends are respectively fixed to the corresponding side walls of the movable block 15 and the movable groove 12.

[0041] In this embodiment, a sliding hole is opened on the movable block 15 at a position corresponding to the movable rod 13 , and the movable block 15 is sleeved on the movable rod 13 through the sliding hole to achieve a sliding connection with the movable rod 13 .

[0042] In this embodiment, the follower mechanism includes racks 24 respectively fixed to the upper and lower ends of the follower side stainless steel heat dissipation fins 9 and double-headed counter-rotating screws 26 placed inside the follower heat dissipation groove 7 and located above and below the two racks 24. One end of the double-headed counter-rotating screw 26 is connected to the inner wall of the protective shell 2 through a bearing, and the other end of the double-headed counter-rotating screw 26 penetrates the protective shell 2 and extends to the corresponding hidden groove 21 on one side, the lithium battery placement port 27 and the hidden groove 21 on the other side are connected to the inner wall of the protective shell 2 through bearings. The double-headed counter-rotating screw 26 is connected to the through section of the protective shell 2 through a bearing, and the corresponding two bottom stainless steel fireproof plates 22 are transmission-connected to the double-headed counter-rotating screw 26 through a transmission nut. Gears 25 that mesh with the corresponding side racks 24 are fixedly sleeved on the two double-headed counter-rotating screws 26 and located inside the heat dissipation groove 7.

[0043] In this embodiment, four diffusion slots that are not connected to the battery cavity 10 are symmetrically opened on the protective shell 2 along the heat dissipation slot 7 .

[0044] The specific working principle of this embodiment is as follows: when the lithium battery module is operating normally, the coolant in the liquid cooling plate 1 dissipates heat to the multiple lithium batteries 5, and at the same time, the multiple side stainless steel heat dissipation fins 9 dissipate heat, thereby improving the heat dissipation efficiency of the lithium battery module and reducing the probability of overheating and runaway of the lithium battery module;

[0045] When the lithium battery module overheats and burns out of control, the corresponding smoke sensor 4 detects the smoke and transmits the signal to the lithium battery module control system. The lithium battery module control system controls the electromagnets 6 on the four side stainless steel heat sinks 9 of the corresponding lithium battery 5 to be energized. The four electromagnets 6 are energized to generate adsorption force, so that the four side stainless steel heat sinks 9 are attracted in pairs. During the process of the four side stainless steel heat sinks 9 being attracted in pairs, the connected side stainless steel fireproof plates 8 are respectively driven to move in the same direction, and the connected racks 24 are respectively driven to move in the same direction. During the movement of the four racks 24, the corresponding gears 25 are driven to rotate. The four gears 25 are respectively The corresponding double-headed counter-rotating screws 26 are driven to rotate. During the rotation of the four double-headed counter-rotating screws 26, the four top stainless steel fireproof plates 23 and the four bottom stainless steel fireproof plates 22 move in pairs on the corresponding double-headed counter-rotating screws 26 in the direction of approaching each other until the four side stainless steel heat dissipating fins 9 are attracted in pairs. At this time, the four side stainless steel heat dissipating fins 9 and the side stainless steel fireproof plates 8 as well as the two top stainless steel fireproof plates 23 and the bottom stainless steel fireproof plates 22 surround the corresponding lithium battery 5 in all directions, so that the corresponding lithium battery 5 is in a closed space and waits for processing, without affecting the liquid cooling plate 1, the protective shell 2 and the protective cover plate 3, and the thermal runaway prevention effect is good.

[0046] Example 2

[0047] This embodiment differs from Embodiment 1 in that:

[0048] In this embodiment, a flame-retardant gas cavity 16 is opened inside the side stainless steel fireproof plate 8, wherein the flame-retardant gas in the flame-retardant gas cavity 16 can be a mixture of inert gas, carbon dioxide or other flame-retardant gases, and an overheating runaway fire extinguishing trigger mechanism is installed between the side stainless steel fireproof plate 8 and the corresponding lithium battery 5. The overheating runaway fire extinguishing trigger mechanism includes an abutment rod 19 fixed to the lithium battery 5 and an air outlet 20 opened on the side stainless steel fireproof plate 8 facing the side wall of the lithium battery 5, and a closing plate 18 is placed inside the air outlet 20. The closing plate 18 is elastically connected to the side wall away from the abutment rod 19 and the inner wall of the flame-retardant gas cavity 16 by a second connecting spring 17.

[0049] In this embodiment, the air outlet 20 is in a T-shaped circular shape, and the diameter of the closing plate 18 is smaller than the diameter of the large circle and larger than the diameter of the small circle.

[0050] In this embodiment, the four side stainless steel fireproof plates 8 move until they surround the corresponding lithium battery 5. At this time, the four abutment rods 19 on the corresponding lithium battery 5 push the corresponding closing plate 18 into the corresponding flame-retardant gas cavity 16. The flame-retardant gas in the four flame-retardant gas cavities 16 can be discharged through the corresponding gas outlets 20 to perform flame retardant fire extinguishing operations on the overheated and burning lithium battery 5, thereby avoiding the long-term overheating and combustion of the lithium battery module and causing the expansion of the out-of-control range.

[0051] Example 3

[0052] This embodiment differs from Embodiment 1 or 2 in that:

[0053] In this embodiment, the surface of the liquid cooling plate 1 is provided with curved cooling channels. The liquid cooling plate 1 includes an aerogel layer, with a first silicone foam layer and a second silicone foam layer provided on either side of the aerogel layer. A first glass fiber layer is provided on the outer surface of the first silicone foam layer, and a first thermally conductive metal layer is provided on the outer surface of the first glass fiber layer. A second glass fiber layer is provided on the outer surface of the second silicone foam layer, and a second thermally conductive metal layer is provided on the outer surface of the second glass fiber layer. The first and second thermally conductive metal layers are thermally conductive aluminum plates or thermally conductive stainless steel plates, and the first and second glass fiber layers are glass fiber cloth.

[0054] In this embodiment, the first silicone foam layer and the second silicone foam layer are both ceramic liquid foamed silicone. The first silicone foam layer and the second silicone foam layer will be ceramicized at ≥500°C, and the fire-resistant temperature is ≥1300°C.

[0055] In this embodiment, the ceramic liquid foamed silica gel includes a first component and / or a second component; the first component includes the following raw materials in parts by mass: 30 to 40 parts of 100,000 viscosity vinyl silicone oil, 10 to 20 parts of white carbon black, 20 to 50 parts of ceramic powder, 0.1 to 0.5 parts of acetylene alcohol inhibitors, and 1 to 10 parts of hydrogen-containing silicone oil; wherein the acetylene alcohol inhibitor is at least one of ethynyl cyclohexanol, methyl butynol, methyl pentynol, and dimethyl hexynol; the second component includes the following raw materials in parts by mass: 30 to 40 parts of 5000 viscosity vinyl silicone oil, 10 to 20 parts of white carbon black, 20 to 50 parts of ceramic powder, 1 to 10 parts of hydroxy silicone oil, and 0.1 to 1.0 parts of platinum catalyst.

[0056] In this embodiment, the liquid cooling plate 1 has excellent heat dissipation, buffering, and thermal insulation and fire resistance properties, as follows: First, heat is dissipated by conduction through the contact between the heat-conducting metal layer and the lithium battery. When the temperature rise is relatively high, liquid cooling and heat dissipation are simultaneously performed through the cooling channel of the liquid cooling plate; secondly, the aerogel layer has an extremely low density and a very good thermal insulation effect, the glass fiber layer has enhanced mechanical strength, scratch resistance, puncture resistance and good fire resistance, and the silicone foam layer will undergo ceramicization above 500°C and can withstand the burning of flames above 1300°C for a long time. Therefore, when thermal runaway occurs, the transfer of fire and temperature can be timely isolated; in addition, the silicone foam layer and the aerogel layer can also play a buffering and protective role when the lithium battery expands.

[0057] Example 4

[0058] This embodiment differs from Embodiment 1 or 2 in that:

[0059] In this embodiment, the surface of the side stainless steel heat sink fins 9 is provided with a phase change material heat dissipation layer, which is polyethylene glycol with an average relative molecular mass of 1050. Polyethylene glycol is an organic solid-solid phase change material (the ordered molecular connection structure in the solid state changes to a disordered molecular connection structure in the solid state), and its phase transition temperature increases with the increase of the degree of polymerization. Therefore, its average relative molecular mass cannot be too high or too low. When the phase transition temperature (approximately 41°C) is reached, a solid-solid phase transition occurs, absorbing heat, thereby reducing the temperature inside the battery module.

[0060] Preferably, the surface of the side stainless steel heat dissipation fins 9 is also provided with a graphene heat-conducting layer, and the thermal conductivity of the graphene heat-conducting layer is 4000W / (m*K); graphene has excellent thermal conductivity and heat dissipation performance, and its thermal conductivity is 10 times stronger than that of silver. By adding a graphene heat-conducting layer, it can quickly conduct the heat absorbed by the phase change material heat dissipation layer to the external environment, avoiding heat accumulation. This has a better heat dissipation effect than setting a single phase change material heat dissipation layer. Therefore, the present application can greatly improve the heat dissipation performance of the battery module by setting a dual heat-conducting and heat-dissipating layer of graphene heat-conducting layer + phase change material heat dissipation layer.

[0061] Preferably, the phase change material heat dissipation layer is arranged in a zigzag structure around the surface of the side stainless steel heat dissipation fins 9, forming a first zigzag structure. The graphene thermal conductive layer is arranged in a zigzag structure around the surface of the side stainless steel heat dissipation fins 9, forming a second zigzag structure that interlocks with the first zigzag structure. The phase change material heat dissipation layer and the graphene thermal conductive layer have the same thickness and are on the same horizontal plane. This arrangement can reduce the overall thickness of the dual heat dissipation layers due to the stacked arrangement without affecting their heat dissipation effect.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery module with thermal runaway resistance, characterized in that: include: A liquid cooling plate (1), wherein the top of the liquid cooling plate (1) is fixedly connected to a protective shell (2), a battery cavity (10) with an upper end opening is provided inside the protective shell (2), a lithium battery placement port (27) connecting the liquid cooling plate (1) and the battery cavity (10) is provided at the bottom of the protective shell (2), a lithium battery (5) is placed inside the battery cavity (10), the lithium battery (5) is limited by the lithium battery placement port (27) and the bottom end passes through the lithium battery placement port (27) to contact the liquid cooling plate (1), side stainless steel fireproof plates (8) are respectively placed outside the four corners of the lithium battery (5) inside the battery cavity (10), heat dissipation grooves (7) are respectively provided on the protective shell (2) outside the four corners of the lithium battery (5), side stainless steel heat dissipation fins (9) are placed inside the heat dissipation grooves (7), and a plurality of the side stainless steel fireproof plates (8) are fixedly connected to the corresponding side stainless steel heat dissipation fins (9); An overheating runaway adsorption mechanism is installed between the side stainless steel heat dissipation fin (9) and the protective shell (2); the bottom end of the protective shell (2) is provided with hidden grooves (21) on both sides of the lithium battery placement port (27) and at corresponding positions on the top end of the protective shell (2); a top stainless steel fireproof plate (23) is placed inside the top hidden groove (21); a bottom stainless steel fireproof plate (22) is placed inside the bottom hidden groove (21); a plurality of the top stainless steel fireproof plates (23) and the bottom stainless steel fireproof plates (22) are provided with a follow-up mechanism between the corresponding side stainless steel heat dissipation fin (9) and the protective shell (2); a protective cover plate (3) is fixedly connected to the top end of the protective shell (2) by bolts; smoke sensors (4) are respectively embedded in the protective cover plate (3) at positions corresponding to the lithium batteries (5); the lithium batteries (5), the overheating runaway adsorption mechanism and the smoke sensors (4) are connected to the control system and power supply system wires of the lithium battery module.

2. The lithium battery module with thermal runaway resistance according to claim 1, characterized in that: The lithium battery (5) is in a square platform shape, and the two bottom stainless steel fireproof plates (22) corresponding to the lithium battery (5) are in a wedge shape that matches the lithium battery (5).

3. The lithium battery module with thermal runaway resistance according to claim 1, characterized in that: The overheating runaway adsorption mechanism comprises an electromagnet (6) and an iron bar (11) respectively fixed to the side walls of the stainless steel heat dissipation fins (9) on two sides of the horizontal line close to each other, and the electromagnet (6) is connected to the control system and power supply system wires of the lithium battery module.

4. The lithium battery module with thermal runaway resistance according to claim 1, wherein: The overheating runaway adsorption mechanism also includes an auxiliary sliding mechanism assembled between the side stainless steel heat dissipation fins (9) and the protective shell (2), the auxiliary sliding mechanism including two movable grooves (12) symmetrically opened on the protective shell (2) along the side stainless steel heat dissipation fins (9) and two movable blocks (15) symmetrically fixed on the side stainless steel heat dissipation fins (9), a movable rod (13) is fixed inside the movable groove (12), the movable block (15) is slidably connected to the movable rod (13), and a first connecting spring (14) is sleeved on the movable rod (13), the two ends of which are respectively fixed to the corresponding side walls of the movable block (15) and the movable groove (12).

5. The lithium battery module with thermal runaway resistance according to claim 4, characterized in that: A sliding hole is provided on the movable block (15) at a position corresponding to the movable rod (13), and the movable block (15) is sleeved on the movable rod (13) through the sliding hole to achieve sliding connection with the movable rod (13).

6. The lithium battery module with thermal runaway resistance according to claim 1, characterized in that: The following mechanism comprises racks (24) respectively fixed to the upper and lower ends of the following side stainless steel heat dissipation fins (9) and double-headed counter-rotating screws (26) placed inside the following heat dissipation groove (7) and located above and below the two racks (24). One end of the double-headed counter-rotating screw (26) is connected to the inner wall of the protective shell (2) through a bearing. The other end of the double-headed counter-rotating screw (26) penetrates the protective shell (2) and extends to the corresponding side hidden groove (21), the lithium battery placement port (27) and the other side hidden groove (21) and is connected to the inner wall of the protective shell (2) through a bearing. The double-headed counter-rotating screw (26) is connected to the through section of the protective shell (2) through a bearing. The corresponding two bottom stainless steel fireproof plates (22) are connected to the double-headed counter-rotating screw (26) through a transmission nut. The two double-headed counter-rotating screws (26) are respectively fixedly sleeved with gears (25) meshing with the corresponding side racks (24) inside the heat dissipation groove (7).

7. The lithium battery module with thermal runaway resistance according to claim 1, characterized in that: Four diffusion grooves not in communication with the battery cavity (10) are symmetrically provided on the protective shell (2) along the heat dissipation groove (7).

8. The lithium battery module with thermal runaway resistance according to claim 1, characterized in that: A flame-retardant gas cavity (16) is provided inside the side stainless steel fireproof plate (8), and an overheating runaway fire extinguishing trigger mechanism is installed between the side stainless steel fireproof plate (8) and the corresponding lithium battery (5). The overheating runaway fire extinguishing trigger mechanism includes an abutting rod (19) fixedly connected to the lithium battery (5) and an air outlet (20) provided on the side stainless steel fireproof plate (8) toward the side wall of the lithium battery (5). A closing plate (18) is placed inside the air outlet (20), and a second connecting spring (17) is elastically connected between the closing plate (18) and the inner wall of the flame-retardant gas cavity (16) away from the side wall of the abutting rod (19).

9. The lithium battery module with thermal runaway resistance according to claim 8, characterized in that: The air outlet (20) is in a T-shaped circle, and the diameter of the closing plate (18) is smaller than the diameter of the large circle and larger than the diameter of the small circle.

10. The lithium battery module with thermal runaway resistance according to claim 1, characterized in that: The surface of the liquid cooling plate (1) is provided with a curved cooling channel, and the liquid cooling plate (1) comprises an aerogel layer, and both side surfaces of the aerogel layer are provided with a first silicone foam layer and a second silicone foam layer respectively; the outer surface of the first silicone foam layer is provided with a first glass fiber layer, and the outer surface of the first glass fiber layer is provided with a first heat-conducting metal layer; the outer surface of the second silicone foam layer is provided with a second glass fiber layer, and the outer surface of the second glass fiber layer is provided with a second heat-conducting metal layer.

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