CN116826291A - Lithium battery module with thermal runaway prevention performance - Google Patents
Lithium battery module with thermal runaway prevention performance Download PDFInfo
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- CN116826291A CN116826291A CN202310721909.5A CN202310721909A CN116826291A CN 116826291 A CN116826291 A CN 116826291A CN 202310721909 A CN202310721909 A CN 202310721909A CN 116826291 A CN116826291 A CN 116826291A
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- lithium battery
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 117
- 230000002265 prevention Effects 0.000 title claims abstract description 25
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- 239000010935 stainless steel Substances 0.000 claims abstract description 101
- 230000001681 protective effect Effects 0.000 claims abstract description 42
- 230000007246 mechanism Effects 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 239000000779 smoke Substances 0.000 claims abstract description 9
- 230000017525 heat dissipation Effects 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 239000000741 silica gel Substances 0.000 claims description 24
- 229910002027 silica gel Inorganic materials 0.000 claims description 24
- 239000006260 foam Substances 0.000 claims description 21
- 239000003365 glass fiber Substances 0.000 claims description 16
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 11
- 239000003063 flame retardant Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
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- 238000013021 overheating Methods 0.000 abstract 1
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- 229910021389 graphene Inorganic materials 0.000 description 13
- 239000012782 phase change material Substances 0.000 description 12
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 239000002202 Polyethylene glycol Substances 0.000 description 5
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- 239000012071 phase Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
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- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 1
- NECRQCBKTGZNMH-UHFFFAOYSA-N 3,5-dimethylhex-1-yn-3-ol Chemical compound CC(C)CC(C)(O)C#C NECRQCBKTGZNMH-UHFFFAOYSA-N 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The application discloses a lithium battery module with thermal runaway prevention performance, which mainly solves the problem of thermal runaway possibly occurring in the use process of the lithium battery module. The lithium battery module comprises a liquid cooling plate, a protective shell, side stainless steel fireproof plates and radiating fins, wherein the side stainless steel fireproof plates and the radiating fins are arranged inside and outside the protective shell; meanwhile, an overheating out-of-control adsorption mechanism is arranged between the stainless steel radiating fins on two sides of the horizontal line. Once the smoke sensor detects the overheat burning of the lithium battery, the side stainless steel radiating fins, the side stainless steel fireproof plate and the upper and lower sealing mechanism realize the omnibearing sealing of the lithium battery, and structural damage of the lithium battery module caused by the overheat burning is avoided. The lithium battery module has the characteristics of good protection performance and strong thermal runaway prevention performance.
Description
Technical Field
The application belongs to the technical field of lithium batteries, and particularly relates to a lithium battery module with thermal runaway prevention performance.
Background
With the wide application of lithium ion batteries in the fields of mobile electronic devices, electric automobiles and the like, the prevention of safety problems such as thermal runaway and explosion of lithium ion batteries becomes increasingly important. The lithium battery module is composed of a plurality of lithium batteries, and the thermal runaway can cause serious consequences such as gas explosion, structural failure and the like in the module.
Patent No. 201921623027.0 discloses a lithium ion battery module for preventing thermal runaway, which consists of a cold plate, a liquid heat conduction pad fixed at the top end of the cold plate, a plurality of electric cores fixedly connected on the liquid heat conduction pad at equal intervals, a fireproof layer which is fixed on the liquid heat conduction pad and is formed by an inter-electric-core fireproof layer and a phase-change material between adjacent electric cores, an end plate side fireproof layer and a side plate fireproof layer which are positioned at the end parts and the side parts of the electric cores, and a module upper cover plate and an end plate which are positioned outside the end plate side fireproof layer and the side plate fireproof layer.
However, the present inventors found that: above-mentioned current lithium ion battery module promptly is in order to make things convenient for lithium ion battery module's heat dissipation, to not setting up protective structure on liquid heat conduction pad and the cold plate, can lead to the fact harm to liquid heat conduction pad and cold plate when leading to lithium ion battery module thermal runaway, can influence other lithium ion batteries that do not have thermal runaway through liquid heat conduction pad even when serious, and then influence stability and the security of whole lithium battery module, thermal runaway prevention performance is to be improved.
Therefore, there is a need to develop a lithium battery module that can effectively protect the lithium battery module and improve the thermal runaway prevention performance of the lithium battery module.
Disclosure of Invention
To solve the problems set forth in the background art. The application provides a lithium battery module with thermal runaway prevention performance, which has the characteristic of improving the thermal runaway prevention performance of the lithium battery module.
In order to achieve the above purpose, the present application provides the following technical solutions:
a lithium battery module having thermal runaway prevention performance, comprising: the lithium battery is placed in the battery cavity, the lithium battery is limited through the lithium battery placing opening, the bottom end of the lithium battery passes through the lithium battery placing opening to be in contact with the liquid cooling plate, side stainless steel fireproof plates are respectively placed in the battery cavity, heat dissipation through grooves are respectively formed in the outer sides of four corners of the lithium battery on the protective shell, side stainless steel heat dissipation fins are placed in the heat dissipation through grooves, and the side stainless steel fireproof plates are fixedly connected with the corresponding side stainless steel heat dissipation fins;
the lithium battery protection device is characterized in that an overheat control adsorption mechanism is assembled between the side stainless steel radiating fins and the protection shell, the bottom end of the protection shell is positioned at two sides of a lithium battery placing opening and corresponding positions of the top end of the protection shell, hidden grooves are respectively formed in the corresponding positions of the top end of the protection shell, top stainless steel fireproof plates are arranged in the hidden grooves, bottom stainless steel fireproof plates are arranged in the hidden grooves, follow-up mechanisms are assembled between the top stainless steel fireproof plates and the bottom stainless steel fireproof plates and the corresponding side stainless steel radiating fins and the protection shell, protection cover plates are fixedly connected with bolts at the top end of the protection shell, smoke sensors are respectively embedded in the positions of the protection cover plates corresponding to the lithium battery, and the lithium battery, the overheat control adsorption mechanism and the smoke sensors are connected with a control system and a power supply system of the lithium battery module.
Preferably, the lithium battery is square table-shaped, and the two bottom stainless steel fireproof plates corresponding to the lithium battery are wedge-shaped matched with the lithium battery.
Preferably, the overheat runaway adsorption mechanism comprises an electromagnet and an iron bar which are fixedly connected to the two side stainless steel radiating fins on the two sides of the horizontal line respectively and are close to the side wall, and the electromagnet is connected with a control system and a power supply system of the lithium battery module through wires.
Preferably, the overheat runaway adsorption mechanism further comprises an auxiliary sliding mechanism assembled between the side stainless steel radiating fins and the protective shell, the auxiliary sliding mechanism comprises two movable grooves symmetrically arranged on the protective shell along the side stainless steel radiating fins and two movable blocks symmetrically fixedly connected on the side stainless steel radiating fins, a movable rod is fixedly connected inside the movable grooves, the movable blocks are in sliding connection with the movable rod, and first connecting springs with two ends fixedly connected with corresponding side walls of the movable blocks and the movable grooves are sleeved on the movable rod.
Preferably, the movable block is provided with a sliding hole corresponding to the position of the movable rod, and the movable block is sleeved on the movable rod through the sliding hole to realize sliding connection with the movable rod.
Preferably, the follow-up mechanism comprises racks fixedly connected to the upper end and the lower end of the follow-up side stainless steel radiating fins respectively and double-head different-direction screws placed in the follow-up radiating through grooves and respectively located below the two racks, one end of each double-head different-direction screw is connected with the inner wall of the protective shell through a bearing, the other end of each double-head different-direction screw penetrates through the protective shell to extend to the corresponding side hiding groove respectively, the lithium battery placing port and the other side hiding groove are connected with the inner wall of the protective shell through the bearing, each double-head different-direction screw is connected with the penetrating section of the protective shell through the bearing, the corresponding two bottom stainless steel fireproof plates are connected with the double-head different-direction screws through transmission nuts, and the two double-head different-direction screws are respectively fixedly sleeved with gears meshed with the corresponding side racks in the radiating through grooves.
Preferably, four diffusion grooves which are not communicated with the battery cavity are symmetrically formed in the protective shell along the heat dissipation through grooves.
Preferably, the gas-resistant cavity is formed in the side stainless steel fireproof plate, an overheat and runaway fire-extinguishing triggering mechanism is assembled between the side stainless steel fireproof plate and the corresponding lithium battery, the overheat and runaway fire-extinguishing triggering mechanism comprises a supporting rod fixedly connected to the lithium battery and a gas outlet formed in the side stainless steel fireproof plate, the gas outlet faces the side wall of the lithium battery, a sealing plate is arranged in the gas outlet, and a second connecting spring is elastically connected between the side wall of the supporting rod and the inner wall of the flame-retardant gas cavity, which is far away from the sealing plate.
Preferably, the air outlet is in a T-shaped round shape, and the diameter of the sealing plate is smaller than the diameter of the large circle and larger than the diameter of the small circle.
Preferably, the surface of the liquid cooling plate is provided with a curved cooling flow channel, the liquid cooling plate comprises an aerogel layer, and the surfaces of two sides of the aerogel layer are respectively provided with a first silica gel foam layer and a second silica gel foam layer; the outer surface of the first silica gel 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 conduction metal layer; the outer surface of the second silica gel 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 conduction metal layer.
Preferably, the first silica gel foam layer and the second silica gel foam layer are both ceramic liquid foaming silica gel, and the first silica gel foam layer and the second silica gel foam layer are ceramic when the temperature is more than or equal to 500 ℃, and the fire-resistant temperature is more than or equal to 1300 ℃.
Preferably, the surface of the side stainless steel radiating fin is provided with a phase change material radiating layer, and the phase change material radiating layer is polyethylene glycol with the average relative molecular mass of 1050.
Preferably, the surface of the side stainless steel radiating fin is further provided with a graphene heat conduction layer, and the heat conduction coefficient of the graphene heat conduction layer is 4000W/(m×k).
Preferably, the phase change material heat dissipation layer is arranged around the surface of the side stainless steel heat dissipation fin in a shape of a circle and forms a first shape of a circle, the graphene heat conduction layer is arranged around the surface of the side stainless steel heat dissipation fin in a shape of a circle and forms a second shape of a circle which is embedded with the first shape of a circle, and the thicknesses of the phase change material heat dissipation layer and the graphene heat conduction layer are the same and are on the same horizontal plane.
Compared with the prior art, the application has at least the following beneficial effects:
1. according to the application, the side stainless steel fireproof plates are arranged in the protective shell corresponding to the four sides outside the lithium battery, the heat dissipation through grooves for placing the side stainless steel heat dissipation fins are arranged on the protective shell corresponding to the four sides outside the lithium battery, the side stainless steel fireproof plates are fixedly connected with the side stainless steel heat dissipation fins, the two middle side stainless steel heat dissipation fins of the horizontal line are provided with overheat uncontrolled adsorption mechanisms, meanwhile, the upper and lower sealing mechanisms are arranged in the protective shell and positioned on the upper side and the lower side of the lithium battery, and the follow-up mechanisms are arranged between the upper and lower sealing mechanisms and the corresponding side stainless steel heat dissipation fins, namely, the smoke sensor senses overheat combustion of the lithium battery, the side stainless steel heat dissipation fins, the side stainless steel fireproof plates and the upper and lower sealing mechanisms can be simultaneously linked to realize omnibearing sealing of the lithium battery, so that damage of the lithium battery module to remove the outer structure of the lithium battery due to overheat combustion is avoided, and the heat loss prevention performance is good.
2. According to the application, the gas-blocking cavity filled with the flame-retardant gas is arranged in the side stainless steel fireproof plate, the abutting type release mechanism is arranged at the same time, and the abutting type mechanism is correspondingly arranged on the lithium battery, so that further expansion of fire behavior can be rapidly realized through the flame-retardant gas in a closed environment, and the thermal runaway prevention performance of the lithium battery module is further improved. Therefore, the lithium battery module has the characteristics of good protection performance and strong thermal runaway prevention performance.
Drawings
FIG. 1 is a perspective view of the present application;
FIG. 2 is a cross-sectional view of the present application;
FIG. 3 is an enlarged view of the application at A in FIG. 2;
FIG. 4 is a schematic view of the thermal runaway condition of FIG. 2 according to the present application;
FIG. 5 is an enlarged view of the application at B in FIG. 4;
FIG. 6 is a vertical cross-section of FIG. 4 according to the present application;
FIG. 7 is a vertical cross-section of the present application;
fig. 8 is an enlarged view of fig. 7 at C in accordance with the present application.
In the figure: 1. a liquid cooling plate; 2. a protective housing; 3. a protective cover plate; 4. a smoke sensor; 5. a lithium battery; 6. an electromagnet; 7. a heat dissipation through groove; 8. side stainless steel fireproof plates; 9. side stainless steel radiating fins; 10. a battery cavity; 11. iron bars; 12. a movable groove; 13. a movable rod; 14. a first connecting spring; 15. a movable block; 16. gas blocking body cavity; 17. a second connecting spring; 18. a closing plate; 19. a butt joint rod; 20. an air outlet; 21. hiding the groove; 22. a bottom stainless steel fireproof plate; 23. a stainless steel fireproof plate is jacked; 24. a rack; 25. a gear; 26. double-end anisotropic screw; 27. and a lithium battery placing port.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
Referring to fig. 1-8, the present application provides a lithium battery module with thermal runaway protection, comprising: the liquid cooling board 1, the top rigid coupling of liquid cooling board 1 has protective housing 2, the battery chamber 10 of upper end opening has been seted up to protective housing 2 inside, protective housing 2 bottom has been seted up the lithium cell of intercommunication liquid cooling board 1 and battery chamber 10 and has been placed mouth 27, lithium cell 5 has been placed to battery chamber 10 inside, lithium cell 5 is spacing through lithium cell placement mouth 27 and bottom pass lithium cell placement mouth 27 contact liquid cooling board 1, side stainless steel fireproof plate 8 has been placed respectively in the battery chamber 10 inside in lithium cell 5 four corners outside, side stainless steel fireproof plate 8 has been seted up respectively in protective housing 2 outside in lithium cell 5 four corners, side stainless steel radiating fin 9 has been placed in the heat radiating through-groove 7 inside, a plurality of side stainless steel fireproof plates 8 and corresponding side stainless steel radiating fin 9 rigid coupling, be equipped with overheated adsorption mechanism between side stainless steel radiating fin 9 and protective housing 2, protective housing 2 bottom is located lithium cell placement mouth 27 both sides and protective housing 2 corresponding position has seted up hidden groove 21 respectively, top hidden groove 21 inside, bottom hidden groove 21 inside has placed bottom stainless steel fireproof plate 21 inside, bottom stainless steel fireproof plate 22 has been placed bottom plate 22, a plurality of side stainless steel fireproof plate 22 and lithium cell system has been connected with corresponding stainless steel radiating fin 3, and the corresponding electric power supply system is equipped with the inner side stainless steel radiating fin 3, and the protection system has been connected with the protection system is equipped with the protection cover plate 3. Wherein, the control system and the power supply system of the lithium battery module belong to the prior art, and are not repeated here.
In this embodiment, the lithium battery 5 is square table-shaped, and two bottom stainless steel fireproof plates 22 corresponding to the lithium battery 5 are wedge-shaped and matched with the lithium battery 5.
In this embodiment, the overheat runaway adsorption mechanism includes an electromagnet 6 and an iron bar 11 which are fixedly connected to two side stainless steel radiating fins 9 on two sides of a horizontal line and are close to each other on the side wall, and the electromagnet 6 is connected with a control system and a power supply system of the lithium battery module through wires.
In this embodiment, the overheat runaway adsorption mechanism further includes an auxiliary sliding mechanism assembled between the side stainless steel radiating fins 9 and the protective housing 2, the auxiliary sliding mechanism includes two movable grooves 12 symmetrically arranged on the protective housing 2 along the side stainless steel radiating fins 9 and two movable blocks 15 symmetrically fixedly connected on the side stainless steel radiating fins 9, a movable rod 13 is fixedly connected inside the movable grooves 12, the movable blocks 15 are slidably connected with the movable rod 13, and a first connecting spring 14 with two ends fixedly connected with corresponding side walls of the movable blocks 15 and the movable grooves 12 is sleeved on the movable rod 13.
In this embodiment, a sliding hole is formed in the movable block 15 corresponding to the position of the movable rod 13, and the movable block 15 is sleeved on the movable rod 13 through the sliding hole to realize sliding connection with the movable rod 13.
In this embodiment, the following mechanism includes racks 24 fixedly connected to the upper and lower ends of the stainless steel radiating fins 9 on the following side respectively, and double-end anisotropic screws 26 placed in the following radiating through grooves 7 and located above and below the two racks 24 respectively, one end of each double-end anisotropic screw 26 is connected with the inner wall of the protective housing 2 through a bearing, the other end of each double-end anisotropic screw 26 penetrates through the protective housing 2 to extend to the corresponding hidden groove 21 on one side respectively, the lithium battery placing port 27 and the hidden groove 21 on the other side are connected with the inner wall of the protective housing 2 through bearings, each double-end anisotropic screw 26 is connected with the penetrating section of the protective housing 2 through bearings, the corresponding two bottom stainless steel fireproof plates 22 are in transmission connection with each double-end anisotropic screw 26 through a transmission nut, and gears 25 meshed with the corresponding side racks 24 are fixedly sleeved on the two double-end anisotropic screws 26 respectively and located inside the radiating through grooves 7.
In this embodiment, four diffusion grooves which are not communicated with the battery cavity 10 are symmetrically arranged on the protective housing 2 along the heat dissipation through groove 7.
The specific working principle of this embodiment is as follows: when the lithium battery module works normally, the cooling liquid in the liquid cooling plate 1 dissipates heat of a plurality of lithium batteries 5, and meanwhile, a plurality of side stainless steel radiating fins 9 dissipate heat, so that the radiating efficiency of the lithium battery module is improved, and the probability of overheat and runaway of the lithium battery module is reduced;
when the overheat combustion of the lithium battery module is out of control, the corresponding smoke sensor 4 detects smoke and transmits signals to the lithium battery module control system, the lithium battery module control system respectively controls the electromagnets 6 on the four side stainless steel radiating fins 9 of the corresponding lithium battery 5 to be electrified, the four electromagnets 6 are electrified to generate adsorption force, the four side stainless steel radiating fins 9 are attracted in pairs, the four side stainless steel radiating fins 9 respectively drive the connected side stainless steel fireproof plates 8 to move in the same direction in the two-to-two attraction process, simultaneously respectively drive the connected racks 24 to move in the same direction, the four racks 24 drive the corresponding gears 25 to rotate in the moving process, the four gears 25 respectively drive corresponding double-end anisotropic screws 26 to rotate, and in the process of rotating the four double-end anisotropic screws 26, the four top stainless steel fireproof plates 23 and the four bottom stainless steel fireproof plates 22 respectively move in the directions of approaching each other on the corresponding double-end anisotropic screws 26 in pairs until the four side stainless steel radiating fins 9 are attracted in pairs, at the moment, the four side stainless steel radiating fins 9, the side stainless steel fireproof plates 8 and the two top stainless steel fireproof plates 23 and the bottom stainless steel fireproof plates 22 all-around surround corresponding lithium batteries 5, so that the corresponding lithium batteries 5 are in a closed space and wait for treatment, the liquid cooling plate 1, the protective housing 2 and the protective cover plate 3 are not influenced, and the thermal runaway prevention effect is good.
Example 2
The difference between this embodiment and embodiment 1 is that:
in this embodiment, the side stainless steel fireproof plate 8 is internally provided with the gas-blocking cavity 16, wherein the flame-retardant gas in the flame-retardant cavity 16 may be inert gas, carbon dioxide or other flame-retardant gas mixture, etc., the side stainless steel fireproof plate 8 and the corresponding lithium battery 5 are equipped with a overheat and runaway fire-extinguishing triggering mechanism, the overheat and runaway fire-extinguishing triggering mechanism comprises a supporting rod 19 fixedly connected to the lithium battery 5 and an air outlet 20 formed on the side stainless steel fireproof plate 8 and facing the side wall of the lithium battery 5, a sealing plate 18 is placed in the air outlet 20, and a second connecting spring 17 is elastically connected between the side wall of the sealing plate 18 and the inner wall of the gas-blocking cavity 16.
In this embodiment, the air outlet 20 is in the shape of a T-shaped circle, and the diameter of the closing plate 18 is smaller than the diameter of a large circle and larger than the diameter of a small circle.
In this embodiment, in the moving process of the four side stainless steel fireproof plates 8, until surrounding the corresponding lithium battery 5, at this time, the four abutting rods 19 on the corresponding lithium battery 5 abut the corresponding sealing plate 18 into the corresponding flame-retardant gas cavity 16, and 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 operation on the overheated lithium battery 5, so as to avoid the expansion of the uncontrolled range caused by long-time overheat combustion of the lithium battery module.
Example 3
The difference between this embodiment and embodiment 1 or embodiment 2 is that:
in the embodiment, a curved cooling flow channel is formed in the surface of the liquid cooling plate 1, the liquid cooling plate 1 comprises an aerogel layer, and a first silica gel foam layer and a second silica gel foam layer are respectively arranged on the surfaces of two sides of the aerogel layer; the outer surface of the first silica gel 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 conduction metal layer; the surface on cotton layer of second silica gel bubble is provided with the second glass fiber layer, and the surface on second glass fiber layer is provided with the second heat conduction metal layer. The first heat conduction metal layer and the second heat conduction metal layer are heat conduction aluminum plates or heat conduction stainless steel plates, and the first glass fiber layer and the second glass fiber layer are glass fiber cloth respectively.
In this embodiment, the first silica gel foam layer and the second silica gel foam layer are both ceramic liquid foaming silica gel, and the first silica gel foam layer and the second silica gel foam layer are ceramic when the temperature is not less than 500 ℃, and the fire-resistant temperature is not less than 1300 ℃.
In this embodiment, the ceramified liquid foam silicone comprises a first component and/or a second component; the first component comprises the following raw materials in parts by weight: 30-40 parts of 10-ten-thousand-viscosity vinyl silicone oil, 10-20 parts of white carbon black, 20-50 parts of ceramic powder, 0.1-0.5 part of alkynol inhibitor and 1-10 parts of hydrogen-containing silicone oil; wherein the alkynol inhibitor is at least one of ethynyl cyclohexanol, methylbutynol, methylpentanynol and dimethylhexynol; the second component comprises the following raw materials in parts by weight: 30-40 parts of 5000-viscosity vinyl silicone oil, 10-20 parts of white carbon black, 20-50 parts of ceramic powder, 1-10 parts of hydroxyl silicone oil and 0.1-1.0 part of platinum catalyst.
In this embodiment, the liquid cooling plate 1 has good heat dissipation, buffering, heat insulation and fire resistance, and is specifically as follows: firstly, conducting and radiating heat through the contact of the heat conducting metal layer and the lithium battery, and simultaneously carrying out liquid cooling and radiating through a cooling flow passage of a liquid cooling plate when the temperature rise is higher; secondly, the aerogel layer has extremely low density and excellent heat insulation effect, the glass fiber layer has enhanced mechanical strength, scratch resistance, puncture resistance and better fire resistance, and the silica gel foam layer can be ceramic at the temperature of more than 500 ℃ and can resist the burning of flame at the temperature of more than 1300 ℃ for a long time, so that when thermal runaway occurs, the transmission of fire can be timely isolated and the temperature transmission can be timely carried out; in addition, the silica gel foam layer and the aerogel layer can also play a role in buffering and protecting when the lithium battery expands.
Example 4
The difference between this embodiment and embodiment 1 or embodiment 2 is that:
in this embodiment, the surface of the side stainless steel heat dissipation fin 9 is provided with a phase change material heat dissipation layer, and the phase change material heat dissipation layer is polyethylene glycol with an average relative molecular mass of 1050. The polyethylene glycol is an organic solid-solid phase change material (the solid ordered molecular connecting structure is changed into the solid disordered molecular connecting structure), and the phase change temperature of the polyethylene glycol can be increased along with the increase of the polymerization degree, so that the average relative molecular mass of the polyethylene glycol cannot be too high or too low, and when the phase change temperature (about 41 ℃) is reached, the solid-solid phase change can occur, the heat is absorbed, and the temperature inside the battery module is reduced.
Preferably, the surface of the side stainless steel radiating fin 9 is also provided with a graphene heat conduction layer, and the heat conduction coefficient of the graphene heat conduction layer is 4000W/(m.times.K); the graphene has excellent heat conduction and heat dissipation performance, the heat conductivity of the graphene is 10 times stronger than that of silver, and the graphene can rapidly conduct heat absorbed by the phase change material heat dissipation layer to the external environment through additionally arranging the graphene heat conduction layer, so that heat accumulation is avoided, and the heat dissipation effect is better than that of the single phase change material heat dissipation layer. Therefore, the heat dissipation performance of the battery module can be greatly improved through the arrangement of the graphene heat conduction layer and the dual heat conduction and dissipation layers of the phase change material heat dissipation layer.
Preferably, the phase change material heat dissipation layer is arranged around the surface of the side stainless steel heat dissipation fin 9 in a shape of a loop and forms a first loop structure, the graphene heat conduction layer is arranged around the surface of the side stainless steel heat dissipation fin 9 in a shape of a loop and forms a second loop structure embedded with the first loop structure, and the thicknesses of the phase change material heat dissipation layer and the graphene heat conduction layer are the same and are on the same horizontal plane. The arrangement can reduce the overall thickness of the double heat dissipation layers due to lamination, and meanwhile, the heat dissipation effect of the double heat dissipation layers is not affected.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A lithium battery module having thermal runaway prevention performance, comprising: the lithium battery cooling device comprises a liquid cooling plate (1), wherein a protective shell (2) is fixedly connected to the top end of the liquid cooling plate (1), a battery cavity (10) with an opening at the upper end is formed in the protective shell (2), a lithium battery placing opening (27) for communicating the liquid cooling plate (1) with the battery cavity (10) is formed in the bottom end of the protective shell (2), a lithium battery (5) is placed in the battery cavity (10), the lithium battery (5) is limited through the lithium battery placing opening (27), the bottom end of the lithium battery (5) penetrates through the lithium battery placing opening (27) to be in contact with the liquid cooling plate (1), side stainless steel fireproof plates (8) are respectively placed outside four corners of the lithium battery (5) in the battery cavity (10), radiating through grooves (7) are respectively formed in the four corners of the protective shell (2), and side stainless steel radiating fins (9) are fixedly connected with the side stainless steel fireproof plates (8) and the corresponding side stainless steel radiating fins (9);
the lithium battery protection device is characterized in that an overheat runaway adsorption mechanism is assembled between the side stainless steel radiating fins (9) and the protection shell (2), hidden grooves (21) are respectively formed in the bottom end of the protection shell (2) and located at two sides of a lithium battery placing opening (27) and at corresponding positions of the top end of the protection shell (2), top ends are respectively embedded in positions of the lithium battery (5) corresponding to the positions of the lithium battery (3), a top stainless steel fireproof plate (23) is arranged inside the hidden grooves (21), bottom ends are respectively embedded in the hidden grooves (21), bottom stainless steel fireproof plates (22) are arranged inside the hidden grooves, a plurality of follow-up mechanisms are assembled between the top stainless steel fireproof plates (23) and the bottom stainless steel fireproof plates (22) and the corresponding side stainless steel radiating fins (9) and the protection shell (2), and smoke sensors (4) are respectively embedded in the positions of the protection shell (2), and smoke sensors (5), and control systems and power supply system wires of the lithium battery modules are connected.
2. The lithium battery module with thermal runaway prevention performance according to claim 1, wherein: the lithium battery (5) is square table-shaped, and two bottom stainless steel fireproof plates (22) corresponding to the lithium battery (5) are wedge-shaped matched with the lithium battery (5).
3. The lithium battery module with thermal runaway prevention performance according to claim 1, wherein: the overheat runaway adsorption mechanism comprises an electromagnet (6) and an iron bar (11) which are fixedly connected to two side stainless steel radiating fins (9) on the two sides of a horizontal line and are close to the side wall, and the electromagnet (6) is connected with a control system and a power supply system of the lithium battery module through wires.
4. The lithium battery module with thermal runaway prevention performance according to claim 1, wherein: the overheat runaway adsorption mechanism further comprises an auxiliary sliding mechanism assembled between the side stainless steel radiating fins (9) and the protective shell (2), the auxiliary sliding mechanism comprises two movable grooves (12) symmetrically formed in the protective shell (2) along the side stainless steel radiating fins (9) and two movable blocks (15) symmetrically fixedly connected to the side stainless steel radiating fins (9), movable rods (13) are fixedly connected to the inner parts of the movable grooves (12), the movable blocks (15) are in sliding connection with the movable rods (13), and first connecting springs (14) with two ends respectively fixedly connected with corresponding side walls of the movable blocks (15) and the movable grooves (12) are sleeved on the movable rods (13).
5. The lithium battery module with thermal runaway prevention performance according to claim 4, wherein: the movable block (15) is sleeved on the movable rod (13) through the sliding hole to realize sliding connection with the movable rod (13).
6. The lithium battery module with thermal runaway prevention performance according to claim 1, wherein: the follow-up mechanism comprises racks (24) fixedly connected to the upper end and the lower end of the follow-up side stainless steel radiating fins (9) respectively and double-head different-direction screws (26) placed in the follow-up radiating through grooves (7) and respectively located above and below the two racks (24), one end of each double-head different-direction screw (26) is connected with the inner wall of the protective shell (2) through a bearing, the other end of each double-head different-direction screw (26) penetrates through the protective shell (2) and extends to the corresponding side hiding groove (21), the lithium battery placing port (27) and the other side hiding groove (21) respectively, the corresponding two double-head different-direction screws (26) are connected with the penetrating section of the protective shell (2) through bearings, the corresponding two bottom stainless steel fireproof plates (22) are in transmission connection with the corresponding side racks (24) through transmission nuts, and gears (25) meshed with the corresponding side racks (24) are fixedly sleeved on the two double-head different-direction screws (26) respectively.
7. The lithium battery module with thermal runaway prevention performance according to claim 1, wherein: four diffusion grooves which are not communicated with the battery cavity (10) are symmetrically formed in the protective shell (2) along the heat dissipation through grooves (7).
8. The lithium battery module with thermal runaway prevention performance according to claim 1, wherein: the side stainless steel fireproof plate (8) is internally provided with a gas-blocking cavity (16), a overheat and runaway fire-extinguishing triggering mechanism is assembled between the side stainless steel fireproof plate (8) and the corresponding lithium battery (5), the overheat and runaway fire-extinguishing triggering mechanism comprises a butt rod (19) fixedly connected to the lithium battery (5) and an air outlet (20) arranged on the side stainless steel fireproof plate (8) and facing the side wall of the lithium battery (5), a sealing plate (18) is arranged in the air outlet (20), and a second connecting spring (17) is elastically connected between the side wall of the sealing plate (18) far away from the abutting rod (19) and the inner wall of the flame-retardant gas cavity (16).
9. The lithium battery module with thermal runaway prevention performance according to claim 8, wherein: the air outlet (20) is in a T-shaped round shape, and the diameter of the sealing 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 prevention performance according to claim 1, wherein: the surface of the liquid cooling plate (1) is provided with a bent cooling flow passage, the liquid cooling plate (1) comprises an aerogel layer, and the surfaces of two sides of the aerogel layer are respectively provided with a first silica gel foam layer and a second silica gel foam layer; the outer surface of the first silica gel 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 conduction metal layer; the outer surface of the second silica gel 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 conduction metal layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310721909.5A CN116826291A (en) | 2023-06-16 | 2023-06-16 | Lithium battery module with thermal runaway prevention performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310721909.5A CN116826291A (en) | 2023-06-16 | 2023-06-16 | Lithium battery module with thermal runaway prevention performance |
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| Publication Number | Publication Date |
|---|---|
| CN116826291A true CN116826291A (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310721909.5A Pending CN116826291A (en) | 2023-06-16 | 2023-06-16 | Lithium battery module with thermal runaway prevention performance |
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| Country | Link |
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| CN (1) | CN116826291A (en) |
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2023
- 2023-06-16 CN CN202310721909.5A patent/CN116826291A/en active Pending
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