CN109860456B - Phase change material cooling method for preventing thermal runaway of lithium ion battery pack - Google Patents
Phase change material cooling method for preventing thermal runaway of lithium ion battery pack Download PDFInfo
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- CN109860456B CN109860456B CN201811567878.8A CN201811567878A CN109860456B CN 109860456 B CN109860456 B CN 109860456B CN 201811567878 A CN201811567878 A CN 201811567878A CN 109860456 B CN109860456 B CN 109860456B
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- 239000012782 phase change material Substances 0.000 title claims abstract description 103
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 93
- 238000001816 cooling Methods 0.000 title claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 88
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims description 23
- 239000012071 phase Substances 0.000 claims description 15
- 230000001965 increasing effect Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- 238000009529 body temperature measurement Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052734 helium Inorganic materials 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920000609 methyl cellulose Polymers 0.000 description 3
- 239000001923 methylcellulose Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229940093430 polyethylene glycol 1500 Drugs 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a phase change material cooling method for preventing thermal runaway of a lithium ion battery pack, and relates to a method for preventing thermal runaway of a lithium ion battery pack based on a composite phase change material. The device comprises a box body, wherein two inner carrier aluminum honeycomb plates and two outer carrier aluminum honeycomb plates are arranged in the box body, the two outer carrier rate honeycomb plates are respectively close to the upper side and the lower side of the box body and are clung to the two sides of the box body, and the two inner carrier aluminum honeycomb plates are arranged on the inner sides of the two outer carrier aluminum honeycomb plates; when in use, the lithium ion battery pack is positioned between the two inner-layer carrier aluminum honeycomb plates; filling primary composite phase change materials in aluminum honeycomb holes in an inner carrier aluminum honeycomb plate; and filling secondary composite phase change materials in aluminum honeycomb holes in the outer carrier aluminum honeycomb plate. The invention increases the utilization rate of materials, reduces the cost of products, and greatly improves the use safety coefficient of the lithium ion battery pack.
Description
Technical Field
The invention discloses a phase change material cooling method for preventing thermal runaway of a lithium ion battery pack, and relates to a method for preventing thermal runaway of a lithium ion battery pack based on a composite phase change material.
Background
With the emphasis of human on the living environment, the understanding of the huge side effect crisis brought by modern civilization is deepened, and the redefinition and the change of knowledge of the civilization of the human social industry and the civilization of substances in the future are deeply realized that the development economy must follow two major principles: environmental protection and reasonable use of non-renewable resources. The electric bicycle, the electric tool, the electric automobile and the like are social products which are generated and developed according to the concepts of the two subjects, are natural for protecting the human and are necessary for correctly processing the relationship between the human and the natural. The lithium ion battery has the advantages of high working voltage, long cycle life, low self-discharge, rapid charge and discharge, no memory effect and the like, and has become an ideal power supply for new energy automobiles, digital products, household appliances, electric tools and the like.
However, due to the special use environment of the power battery, the probability of exposing the battery to the special environment (such as high temperature, high-rate charge and discharge, etc.) is also increasing. Under the high-temperature or high-rate charge and discharge environment, a large amount of exothermic reaction exists in the battery, so that the battery can be in thermal runaway, and safety accidents such as leakage, combustion and even explosion can be caused. Therefore, a device capable of preventing thermal runaway of the lithium ion battery pack is urgently needed to ensure the safety of use.
Disclosure of Invention
The invention aims to provide a phase change material cooling method for preventing thermal runaway of a lithium ion battery pack, aiming at the defects, which can ensure that the battery pack works in a lower temperature range, delay performance attenuation of the battery pack and avoid thermal runaway of a battery; and the battery state difference in the battery pack can be reduced by reducing the temperature gradient of the battery pack, so that the performance and safety of the battery under the matched battery pack are ensured.
The invention is realized by adopting the following technical scheme:
The safety device for preventing the lithium ion battery pack from thermal runaway comprises a box body, wherein two inner carrier aluminum honeycomb plates and two outer carrier aluminum honeycomb plates are arranged in the box body, the two outer carrier rate honeycomb plates are respectively close to the upper side and the lower side of the box body and are closely attached to the two sides of the box body, and the inner sides of the two outer carrier aluminum honeycomb plates are provided with the two inner carrier aluminum honeycomb plates; when in use, the lithium ion battery pack is positioned between the two inner-layer carrier aluminum honeycomb plates; filling primary composite phase change materials in aluminum honeycomb holes in an inner carrier aluminum honeycomb plate; and filling secondary composite phase change materials in aluminum honeycomb holes in the outer carrier aluminum honeycomb plate.
The inner side of the inner carrier aluminum honeycomb plate is wavy and is matched with the shape of the lithium ion battery pack to be treated, so that the contact area between the lithium ion battery pack and the inner carrier aluminum honeycomb plate is increased, and the heat conducting performance between the lithium ion battery pack and the inner carrier aluminum honeycomb plate is enhanced.
The aluminum honeycomb orifices of the inner carrier aluminum honeycomb plate and the outer carrier aluminum honeycomb plate are upward, so that the primary composite phase change material and the secondary composite phase change material do not flow and leak when completely phase-change to be in a liquid state.
The primary composite phase change material is prepared from paraffin, active carbon and expanded graphite in a certain mass ratio (in the device, the ratio can be 21:1:4), has lower phase change temperature and melting point of about 50 ℃, and is suitable for being filled in inner carrier aluminum honeycomb plates closest to the upper surface and the lower surface of the lithium ion battery pack.
The preparation method of the first-level composite phase change material comprises the steps of weighing paraffin, expanded graphite and active carbon according to a certain proportion, firstly melting the paraffin, then mixing the graphite, the active carbon and the melted paraffin, rapidly and uniformly stirring again after a heating phase becomes a liquid state, and cooling to room temperature to obtain the expanded graphite-paraffin-active carbon composite phase change material.
The secondary composite phase change material is prepared from polyethylene glycol 1500 and methylcellulose in a certain mass ratio (the applied ratio in the device is 1.6:1), has higher phase change temperature and melting point of about 100 ℃, and is suitable for being filled in two outer carrier aluminum honeycomb plates.
The preparation method of the two-stage composite phase change material comprises weighing polyethylene glycol 1500 and methylcellulose according to a certain proportion, mixing the two products, rapidly stirring uniformly again after the heating phase becomes liquid, and cooling to room temperature to obtain polyethylene glycol 1500-methylcellulose composite phase change material
The inner and outer layer carrier aluminum honeycomb plates are made of commercial 1006 aluminum alloy honeycomb plates serving as raw materials, and special inner layer carrier aluminum honeycomb plates which are matched with the shape of the lithium ion battery pack are manufactured through simple secondary design and processing, namely the commercial 1006 aluminum alloy honeycomb plates are manufactured into shapes with single surfaces in special circular arcs through procedures such as extrusion by a die, wire cutting and the like. Because the aluminum honeycomb is tightly combined with the bottom plate, and the aluminum honeycomb openings of the aluminum honeycomb plates of the inner and outer carriers are upward, the primary and secondary composite phase change materials can not flow and leak when completely phase-change to be in a liquid state, and the recycling property of the composite phase change materials is ensured.
A phase change material cooling method for preventing thermal runaway of a lithium ion battery pack comprises the following steps:
1) The surface temperature of the lithium ion battery pack to be treated is transferred to the primary and secondary composite phase change materials through the carrier aluminum honeycomb plates with good heat conduction performance;
2) The primary and secondary composite phase change materials absorb heat generated by the lithium ion battery pack through phase change, and the secondary composite phase change material absorbs heat carried by the primary composite phase change material;
3) Under the combined action of the first-stage composite phase change material and the second-stage composite phase change material, the heat dissipation capacity of the lithium ion battery pack is greatly increased, so that the temperature of the lithium ion battery pack is in a normal range.
The invention has the following advantages:
1) The simple physical change of material phase change heat absorption is adopted, so that the material can be repeatedly used, the utilization rate of the material is increased, and the product cost is reduced;
2) The carrier raw material of the composite phase change material, namely 1006 aluminum honeycomb plate, is reasonably selected, and the inner carrier aluminum honeycomb plate with radian is obtained through simple secondary design and processing, so that the inner carrier aluminum honeycomb plate with radian not only can play a role in fixing the primary and secondary composite phase change materials and the lithium ion battery pack, but also has the advantages of good heat conduction effect, light weight and corrosion resistance, and can better reduce the counterweight of the device, thereby ensuring that the device is more convenient in the practical application process and has practical value;
3) The primary composite phase change material and the secondary composite phase change material are prepared by mixing and heating common materials which are nontoxic, harmless and easy to prepare in a certain mass ratio, and have the advantages of simple preparation method, short preparation time, low material price and the like, thereby enhancing the practical value;
4) The device has low manufacturing process difficulty and simple assembly, can be applied to the work, storage and transportation of the battery pack formed by a plurality of batteries, and can greatly improve the use safety coefficient of the lithium ion battery pack.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the internal structure of the device of the present invention;
FIG. 2 is a functional block diagram of the apparatus of the present invention;
FIG. 3 is an image of the temperature as a function of time for a primary composite phase change material in a constant high temperature environment;
FIG. 4 is an image of the temperature as a function of time for a two-stage composite phase change material in a constant high temperature environment;
FIG. 5 is a graph showing the surface temperature of a lithium ion battery pack with 5 charge and discharge cycles of 1C as a function of time when the device of the present invention is equipped with a primary and secondary composite phase change material at room temperature (about 30 ℃);
FIG. 6 shows a graph of the surface temperature of a lithium ion battery pack as a function of time by designing a control experiment of the device with only the first-order composite phase change material and without the composite phase change material at room temperature (about 30 ℃);
FIG. 7 shows a graph of the surface temperature of a lithium ion battery pack as a function of time by designing a control experiment of the device with only the two-stage composite phase change material and without the composite phase change material at room temperature (about 30 ℃);
Fig. 8 is an image of the surface temperature of a blank and experimental lithium ion battery as a function of time (where the higher temperature is the blank).
In the figure: 1. an outer layer aluminum honeycomb plate, 2, an inner layer aluminum honeycomb plate, 3, a lithium ion battery pack, 4 and an inner layer aluminum honeycomb plate; 5. an outer aluminum honeycomb panel; 6. the thermocouple in the control experiment measures the temperature of the cross section position of the No. 1 position; 7. the thermocouple in the control experiment measures the temperature of the cross section position of the No. 3 position; 8. and (3) comparing the section position of the thermocouple temperature measurement No. 2 position in the experiment.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 1, the device comprises a box body, wherein two inner-layer carrier aluminum honeycomb plates and two outer-layer carrier aluminum honeycomb plates are arranged in the box body, the two outer-layer carrier rate honeycomb plates are respectively close to the upper side and the lower side of the box body and are clung to the two sides of the box body, and the two inner-layer carrier aluminum honeycomb plates are arranged on the inner sides of the two outer-layer carrier aluminum honeycomb plates; when in use, the lithium ion battery pack is positioned between the two inner-layer carrier aluminum honeycomb plates; filling primary composite phase change materials in aluminum honeycomb holes in an inner carrier aluminum honeycomb plate; and filling secondary composite phase change materials in aluminum honeycomb holes in the outer carrier aluminum honeycomb plate. As can be seen from the figure, the 18650 lithium ion battery 3 is located at the middle, the inner aluminum honeycomb plates 2 and 4 are in up-down contact with the 18650 lithium ion battery 3, the first-stage composite phase change material is filled in the inner aluminum honeycomb plates, and the outer aluminum honeycomb plates 1 and 5 are arranged at the upper and lower outermost layers of the device, and the second-stage composite phase change material is filled in the outer aluminum honeycomb plates.
In the following comparison experiment, the thermocouple is used for measuring the temperature of the battery, and three thermocouple temperature measurement can be respectively arranged at three positions in fig. 1, wherein reference numeral 6 is the cross-section position of the thermocouple temperature measurement No.1 position in the comparison experiment, reference numeral 7 is the cross-section position of the thermocouple temperature measurement No. 3 position in the comparison experiment, and reference numeral 8 is the cross-section position of the thermocouple temperature measurement No. 2 position in the comparison experiment.
Phase change materials (PCM-PHASE CHANGE MATERIAL) refer to substances that change state of a substance and can provide latent heat without changing temperature. The process of transforming physical properties is known as the phase change process, where the phase change material will absorb or release a significant amount of latent heat.
When a phase change occurs, there is a change in volume with simultaneous absorption or release of heat, and such a phase change is referred to as a "first order phase change". For example, at 1 atmosphere and 0 ℃,1 kg of ice mass is converted into water at the same temperature, taking up 79.6 kcal of heat, and at the same time contracting in volume. Therefore, the transition between ice and water is a first order phase transition.
When the phase change occurs, the physical quantity such as the heat capacity, the thermal expansion coefficient, the isothermal compression coefficient and the like changes without changing the volume and without heat absorption or release, and this type of change is called a secondary phase change. The transition between normal liquid helium (helium i) and superfluid helium (helium ii), the transition between normal conductor and superconductor, the transition between paramagnetic and ferromagnetic, the transition between ordered and disordered states of the alloy, etc. are all typical secondary phase transitions.
The invention is further illustrated by the following examples.
Example 1:
Referring to fig. 2, in use, it is first assumed that the temperature of the lithium ion battery pack gradually increases, and the working steps of the safety device for preventing thermal runaway of the lithium ion battery pack are as follows:
(1) The temperature of the lithium ion battery pack is transferred to the primary and secondary composite phase-change materials through the aluminum honeycomb plate with good heat conductivity, and as the temperature of the lithium ion battery pack is increased, the heat absorption capacity of the primary and secondary composite phase-change materials is gradually increased, and the temperature generated by the lithium ion battery pack is emitted in time, so that the heat accumulation effect of the lithium ion battery pack is not easy to occur, and the temperature is stable within the range of the performance of the lithium ion battery pack without loss;
(2) If the working condition or state of the lithium ion battery pack is worse, the temperature of the lithium ion battery pack is still slowly increased, meanwhile, the primary and secondary composite phase change materials slow down the increasing rate of the temperature of the lithium ion battery pack through absorbing heat, when the surface temperature of the lithium ion battery pack reaches about 50 ℃, the temperature value is the melting point of the primary composite phase change material, and at the moment, the primary composite phase change material is subjected to solid-liquid phase change and absorbs a large amount of heat, so that the continuous increasing of the temperature of the lithium ion battery pack is restrained;
(3) If the working condition or state of the lithium ion battery pack is particularly bad, the surface temperature of the lithium ion battery pack is higher than 50 ℃ and still rises slowly, meanwhile, the primary phase change material and the secondary phase change material slow down the rising rate of the temperature of the lithium ion battery pack through absorbing heat, when the surface temperature of the lithium ion battery pack reaches about 100 ℃, the temperature value is the melting point of the secondary composite phase change material, and at the moment, the secondary composite phase change material changes from solid state to liquid state, absorbs a large amount of heat, so that the continuous rising of the temperature of the lithium ion battery pack is restrained;
In the step (1), the step (2) and the step (3), the whole safety device also carries out heat transfer to the air, so that the primary and secondary composite phase change materials can be timely converted from liquid state to solid state; in addition, when the working condition or state of the lithium ion battery pack returns to normal, the primary and secondary composite phase change materials can be timely converted from liquid state to solid state, and the lithium ion battery pack is ready for the next use. The safety device avoids a series of safety accidents caused by high-temperature thermal runaway of the lithium ion battery pack in the whole process.
FIG. 3 is an image of the temperature change function of the primary composite phase change material with time under a constant high temperature environment, and the melting point of the primary composite phase change material is verified to be about 50 ℃.
FIG. 4 is an image of the temperature change function of the secondary composite phase change material with time under a constant high temperature environment, and the melting point of the secondary composite phase change material is verified to be about 100 ℃.
FIG. 5 shows a graph of the surface temperature of a lithium ion battery pack over time for 5 cycles of 1C charge and discharge when the device of the present invention is equipped with a primary and secondary composite phase change material at room temperature (around 30 ℃). In the figure, the primary and secondary composite phase change materials play the same effects in five charge and discharge cycles, so that the primary and secondary composite phase change materials have good recycling property.
Fig. 6 shows that under the condition of room temperature (about 30 ℃), a comparison experiment is carried out on the two conditions that only the primary composite phase change material is arranged and the composite phase change material is not arranged in the device, and the lithium ion battery pack is directly short-circuited, so that the function image of the change of the surface temperature of the lithium ion battery pack along with time in fig. 6 is obtained. As can be seen from the graph, the temperature of the surface of the lithium ion battery pack in the experimental group provided with the primary composite phase change material device is reduced at the temperature rising rate of about 50 ℃, and the temperature of the experimental group provided with the primary composite phase change material device is obviously lower than that of the blank control group not provided with the composite phase change material device, so that the primary composite phase change material has the effect of inhibiting the temperature rising of the lithium ion battery pack.
Fig. 7 shows that under the condition of room temperature (about 30 ℃), a comparison experiment is carried out on the two conditions that only the secondary composite phase change material is arranged in the device of the invention and the composite phase change material is not added, and the lithium ion battery pack is directly short-circuited, so that the function image of the change of the surface temperature of the lithium ion battery pack along with time in fig. 7 is obtained. As can be seen from the graph, the surface temperature rise rate of the lithium ion battery pack in the experimental group provided with the secondary composite phase change material device is obviously lower than that of the blank control group without the composite phase change material device, and the surface temperature of the battery in the experimental group provided with the secondary composite phase change material device is kept below 80 ℃, so that the secondary composite phase change material has the effect of inhibiting the temperature rise of the lithium ion battery pack.
Fig. 8 is an image of the surface temperature change function of the lithium ion battery pack (the temperature is higher as the blank) of the blank and the experimental group, the blank is provided with a safety device without the primary and secondary composite phase change materials, and the experimental group is provided with a safety device with the primary and secondary composite phase change materials. The environmental temperature is controlled to be 40 ℃, in order to verify the effect of the safety device through a plurality of comparison experiments, two groups of lithium ion battery packs with the same performance are subjected to short-circuit treatment at the same time, and the experimental results prove that the surface temperature rising rate of the lithium ion battery packs in the experimental group provided with the one-level and two-level composite phase change material safety device is lower than that of a blank comparison group, and the maximum temperatures of the comparison group and the experimental group are different by 56.2 ℃.
The comparative test proves that the device is effective in preventing the lithium ion battery pack from thermal runaway, is convenient to manufacture and simple in structure, and greatly improves the use safety coefficient of the lithium ion battery pack.
Claims (4)
1. A phase change material cooling method for preventing thermal runaway of a lithium ion battery pack by adopting a safety device for preventing the thermal runaway of the lithium ion battery pack comprises the following steps:
1) The surface temperature of the lithium ion battery pack to be treated is transferred to the primary and secondary composite phase change materials through the carrier aluminum honeycomb plates with good heat conduction performance;
2) The primary and secondary composite phase change materials absorb heat generated by the lithium ion battery pack through phase change, and the secondary composite phase change material absorbs heat carried by the primary composite phase change material;
3) Under the combined action of the first-level composite phase change material and the second-level composite phase change material, the heat dissipation capacity of the lithium ion battery pack is greatly increased, so that the temperature of the lithium ion battery pack is in a normal range;
The safety device for preventing the lithium ion battery pack from thermal runaway comprises a box body, wherein two inner carrier aluminum honeycomb plates and two outer carrier aluminum honeycomb plates are arranged in the box body, the two outer carrier rate honeycomb plates are respectively close to the upper side and the lower side of the box body and are clung to the two sides of the box body, and two inner carrier aluminum honeycomb plates are arranged on the inner sides of the two outer carrier aluminum honeycomb plates; when in use, the lithium ion battery pack is positioned between the two inner-layer carrier aluminum honeycomb plates; filling primary composite phase change materials in aluminum honeycomb holes in an inner carrier aluminum honeycomb plate; filling a secondary composite phase change material in aluminum honeycomb holes in the outer carrier aluminum honeycomb plate;
the inner side of the inner carrier aluminum honeycomb plate is wave-shaped and is matched with the shape of the lithium ion battery pack to be treated, so that the contact area between the lithium ion battery pack and the inner carrier aluminum honeycomb plate is increased, and the heat conducting performance between the lithium ion battery pack and the inner carrier aluminum honeycomb plate is enhanced;
the inner layer and outer layer carrier aluminum honeycomb plates adopt 1006 aluminum alloy honeycomb plates as raw materials;
The aluminum honeycomb orifices of the inner carrier aluminum honeycomb plate and the outer carrier aluminum honeycomb plate are upward, so that the primary composite phase change material and the secondary composite phase change material do not flow and leak when completely phase-change to be in a liquid state.
2. The method for reducing the temperature of the phase change material for preventing the thermal runaway of the lithium ion battery pack by adopting the safety device for preventing the thermal runaway of the lithium ion battery pack according to claim 1, wherein in the step (1), as the temperature of the lithium ion battery pack increases, the heat absorption capacity of the primary composite phase change material and the secondary composite phase change material is gradually increased, and the temperature generated by the lithium ion battery pack is emitted in time.
3. The method for reducing the temperature of the phase change material for preventing the thermal runaway of the lithium ion battery pack by adopting the safety device for preventing the thermal runaway of the lithium ion battery pack according to claim 1, wherein in the step (2), the primary composite phase change material and the secondary composite phase change material slow down the rising rate of the temperature of the lithium ion battery pack by absorbing heat, when the surface temperature of the lithium ion battery pack reaches 50 ℃, the temperature value is the melting point of the primary composite phase change material, and at the moment, the primary composite phase change material is subjected to solid-to-liquid phase change and absorbs a large amount of heat, so that the continuous rising of the temperature of the lithium ion battery pack is inhibited;
when the surface temperature of the lithium ion battery pack reaches 100 ℃, the temperature value is the melting point of the secondary composite phase change material, and at the moment, the secondary composite phase change material changes from solid state to liquid state and absorbs a large amount of heat, so that the continuous rise of the temperature of the lithium ion battery pack is restrained.
4. The method for reducing the temperature of the phase change material for preventing the thermal runaway of the lithium ion battery pack by adopting the safety device for preventing the thermal runaway of the lithium ion battery pack according to claim 1, wherein in the steps (1), (2) and (3), the whole safety device also carries out heat transfer to the air, so that the primary and secondary composite phase change materials can be timely converted from a liquid state to a solid state; in addition, when the working condition or state of the lithium ion battery pack returns to normal, the primary and secondary composite phase change materials are also timely converted from liquid state to solid state, and the lithium ion battery pack is ready for the next use.
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| CN208986072U (en) * | 2018-12-21 | 2019-06-14 | 南京工业大学 | Lithium ion battery pack thermal runaway cooling device based on phase-change material |
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| CN202248646U (en) * | 2011-08-11 | 2012-05-30 | 上海庆华蜂巢建材有限公司 | Corrosion-resistant cellular board |
| KR20130133444A (en) * | 2012-05-29 | 2013-12-09 | 주식회사 엘지화학 | Endothermic separator for electrochemical elements and electrochemical elements comprising the same |
| CN204407446U (en) * | 2015-03-18 | 2015-06-17 | 广东万锦科技股份有限公司 | A kind of power battery thermal management system with heating function |
| JP2016210957A (en) * | 2015-05-13 | 2016-12-15 | アイシン化工株式会社 | Heat storage polymer molded body |
| CN208986072U (en) * | 2018-12-21 | 2019-06-14 | 南京工业大学 | Lithium ion battery pack thermal runaway cooling device based on phase-change material |
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