CN116454483A - Thermal runaway inhibition thin material and lithium battery module - Google Patents
Thermal runaway inhibition thin material and lithium battery module Download PDFInfo
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- CN116454483A CN116454483A CN202310320978.5A CN202310320978A CN116454483A CN 116454483 A CN116454483 A CN 116454483A CN 202310320978 A CN202310320978 A CN 202310320978A CN 116454483 A CN116454483 A CN 116454483A
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- thermal runaway
- lithium battery
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- battery module
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 42
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 title claims abstract description 30
- 230000005764 inhibitory process Effects 0.000 title claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000010439 graphite Substances 0.000 claims abstract description 25
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000010445 mica Substances 0.000 claims abstract description 15
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000004964 aerogel Substances 0.000 claims abstract description 9
- 230000002401 inhibitory effect Effects 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000000741 silica gel Substances 0.000 claims description 7
- 229910002027 silica gel Inorganic materials 0.000 claims description 7
- 238000005187 foaming Methods 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 17
- 238000009413 insulation Methods 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 8
- 239000003792 electrolyte Substances 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract description 7
- 230000002829 reductive effect Effects 0.000 abstract description 5
- 230000003139 buffering effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 7
- 229920001296 polysiloxane Polymers 0.000 description 7
- 239000011247 coating layer Substances 0.000 description 5
- 239000004745 nonwoven fabric Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 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 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the application provides a thermal runaway inhibition thin material and a lithium battery module, which are suitable for a lithium battery capable of being charged and discharged, wherein the thermal runaway inhibition thin material comprises a base layer and an expansion coating attached to at least one surface of the base layer, and the expansion coating at least comprises uniformly distributed expandable graphite particles, mica particles and netlike ultrafine electrostatic fibers; the base layer is an aerogel layer. By adding expandable graphite particles in the expansion coating, the expansion coating can expand when reaching a preset temperature interval, the overall thickness is increased, the porosity is increased, and the heat insulation effect and the thermal shock buffering effect are more outstanding; by adding mica particles, the overall toughness can be increased and the heat insulation effect can be improved; by adding the netlike superfine electrostatic fibers, expandable graphite particles and mica particles can be adsorbed, so that powder falling is reduced; meanwhile, the aerogel layer is used as a base layer, so that the electrolyte can be effectively separated, and the overall thickness is reduced.
Description
Technical Field
The invention relates to a lithium battery safety technology, in particular to a thermal runaway inhibition thin material and a lithium battery module.
Background
A lithium battery is a battery using a nonaqueous electrolyte solution using lithium metal or a lithium alloy as a positive electrode material. The operating principle of lithium ion batteries is based on the movement of lithium ions between a positive electrode and a negative electrode. During charging, the potential applied across the cell causes the positive electrode compound to release lithium ions that pass through the separator and into the layered structure of the carbon molecules in the negative electrode. During discharge, lithium ions are released from the layered carbon and recombined with the positive electrode compounds, which produces an electric current. However, if various causes in the battery induce a thermal runaway phenomenon, which causes a chain reaction inside the battery and generates a large amount of heat and harmful gases, the battery may eventually catch fire and explode.
Fire or explosion of lithium batteries is mainly caused by thermal runaway. The main cause of thermal runaway is heat generated by thermal decomposition reaction in the battery, which is caused by temperature increase of SEI (solid electrolyte interface) film, electrolyte, binder, and anode and cathode active materials in the battery. The thermal runaway of the battery often starts from the negative electrode SEI film inside the battery, and then the separator is decomposed and melted, so that the negative electrode reacts with the electrolyte, and then the positive electrode and the electrolyte are decomposed, so that the internal short circuit is finally initiated, the electrolyte burns and spreads to other battery cells, serious thermal runaway is caused, and the whole battery pack is spontaneous.
Once thermal runaway occurs, the violent reaction generates a large amount of gas and heat, the gas expands to break the battery shell, and meanwhile, the substances can also scatter away part of heat. At this time, the thermal runaway enters the most severe state, and the temperature also reaches the highest value. Thermal runaway may be spread by spreading heat to the surroundings if there are other cells around.
Thermal runaway can only be terminated after the reactants have completely burned out. According to a report from the fire department, for lithium batteries containing high energy devices within the enclosure, the fire control means were temporarily unable to terminate the ongoing thermal runaway. The extinguishing agent does not actually reach the reacting substances. Firefighters are at extremely high risk in fire and therefore can only take measures to limit the spread of the accident. The thermal runaway process can be terminated naturally only by waiting for the reactants to be exhausted.
Currently, methods for suppressing thermal runaway can be classified into external control and internal control. The external control method comprises a digital monitoring system. Internal control methods employ physical or chemical means to reduce the probability of thermal runaway or to control the spread of thermal runaway. However, the existing methods have a certain limitation on the inhibition effect of thermal runaway.
Disclosure of Invention
The invention aims to provide a thermal runaway inhibition thin material which can be heated and expanded when a lithium battery is in thermal runaway to form better heat insulation and thermal shock resistance effects.
Another object of the present invention is to provide a lithium battery module having the above thermal runaway-suppressing sheet.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of the present invention, there is provided a thermal runaway-inhibiting thin material suitable for use in a lithium battery that can be charged and discharged, the thermal runaway-inhibiting thin material comprising a base layer and an expansion coating layer attached to at least one surface of the base layer, wherein the expansion coating layer includes at least expandable graphite particles, mica particles, and reticulated ultrafine electrostatic fibers uniformly distributed therein; the base layer is an aerogel layer.
In one embodiment, the expandable graphite particles have an initial expansion temperature of 100 degrees to 300 degrees celsius.
In one embodiment, the expandable graphite particles and mica particles have a diameter between 0.3 μm and 3.3 μm.
In one embodiment, the mesh-like superfine electrostatic fiber is a polypropylene nonwoven fabric.
In one embodiment, the reticulated superfine electrostatic fibers are pre-electrostatically electret treated.
In one embodiment, the intumescent coating is attached to both the upper and lower surfaces of the base layer.
In one embodiment, the thermal runaway inhibiting thin material has an overall thickness of between 0.4mm and 1 mm.
According to another aspect of the present invention, there is provided a lithium battery module, the lithium battery module including a lithium battery body and a thermal runaway-suppressing sheet covered on a surface of the lithium battery body, the thermal runaway-suppressing sheet being covered with a foamed silicone layer as described in the first aspect, the lithium battery module further including a conductive connection assembly pressed on the foamed silicone layer and fixedly connected with the lithium battery body.
In an embodiment, the conductive connection component is a conductive bar or a collection integrated component of a battery module.
The embodiment of the invention has the beneficial effects that: through adding expandable graphite particles in the expansion coating, the expansion can be performed when a preset temperature interval is reached, the overall thickness is increased, the porosity is increased, the heat insulation effect and the thermal shock buffering effect are more outstanding, and the thermal runaway is prevented from spreading to other battery cells to cause larger damage. By adding mica particles, the overall toughness can be increased and the heat insulating effect can be improved. By adding the netlike superfine electrostatic fibers, expandable graphite particles and mica particles can be adsorbed, and powder falling is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The above features and advantages of the present invention will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily to scale and components having similar related features or characteristics may have the same or similar reference numerals.
FIG. 1 is a schematic cross-sectional view of one embodiment of a thermal runaway inhibiting sheet of the present application;
FIG. 2 is a schematic cross-sectional view of another embodiment of a thermal runaway inhibiting sheet of the present application;
fig. 3 is a schematic exploded view of an embodiment of a lithium battery module of the present application;
fig. 4 is a schematic perspective view of an embodiment of a lithium battery module of the present application;
fig. 5 is a schematic perspective view of another embodiment of a lithium battery module according to the present application;
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments. It is noted that the aspects described below in connection with the drawings and the specific embodiments are merely exemplary and should not be construed as limiting the scope of the invention in any way.
As shown in fig. 1, the embodiment of the present application provides a thermal runaway-inhibiting thin material 100 suitable for use in a lithium battery that can be charged and discharged, the thermal runaway-inhibiting thin material 100 comprising a base layer 120 and an expansion coating layer 110 attached to at least one surface of the base layer, wherein the expansion coating layer 110 comprises at least uniformly distributed expandable graphite particles and network-like ultrafine electrostatic fibers.
The expandable graphite is an important inorganic nonmetallic material which is newly appeared in the last twenty years, has good expansibility, and the finished product has the advantages of radiation protection, heat insulation, lubrication, plasticity, good chemical stability, flexibility and sealing property, and is widely applied to the fields of ferrous metallurgy, chemical industry, medical treatment, mechanical manufacturing, national defense and the like. The expandable graphite particles added in the expansion coating 110 expand when being subjected to a preset temperature, the overall porosity of the composite material after expansion becomes large, the heat insulation effect is obvious, and graphite can resist a temperature exceeding 1200 ℃ and has a certain thermal shock resistance effect.
The expansion temperature of the expandable graphite particles may be selected as desired, for example, an initial expansion temperature of 200 degrees celsius may be selected. Both lower and higher initial expansion temperatures are disclosed in the art, such as the methods disclosed in CN102126719B and CN100400416C for the preparation of low initial expansion temperature expandable graphite and the preparation of low initial expansion temperature expandable graphite.
The mica particles can improve the tensile strength and the bending strength of the thermal runaway inhibition thin material, increase the overall toughness, simultaneously resist high temperature of 700 to 1000 ℃, and can also increase the thermal shock resistance and the heat insulation effect of the thermal runaway inhibition thin material.
After the expandable graphite particles and the mica particles are added, the powder falling problem is easy to occur, so that the net-shaped superfine electrostatic fibers are also added into the expansion coating 110, and the graphite particles and the mica particles are uniformly adsorbed on the surfaces of the net-shaped superfine electrostatic fibers by utilizing the electrostatic adsorption effect, so that the particles are not easy to fall off.
The base layer 120 is preferably an aerogel layer, the aerogel layer is formed by compounding nano silicon dioxide aerogel serving as a main material with glass fiber cotton or pre-oxidized fiber felt through a special process, and has low heat conductivity coefficient and certain tensile and compressive strength, so that the heat insulation effect is excellent. The aerogel layer is a key protective layer resistant to temperature impact, and the sprayed electrolyte is separated before the layer and cannot melt and penetrate downwards to continue to spread.
In addition, the aerogel layer is thin as a base layer, so that the overall thickness of the thermal runaway-suppressing sheet can be reduced. Even when the expansion coating layers 110, 130 are simultaneously attached to the upper and lower surfaces of the base layer 120, the thickness of the thermal runaway-suppressing thin material may reach 0.4mm to 1mm, as shown in fig. 2.
On the basis, electrostatic electret treatment can be performed on the mesh-shaped superfine electrostatic fibers in advance, charges are attached to the mesh-shaped superfine electrostatic fibers through high-voltage discharge, a large number of electrodes are formed among the charged fibers, and the charged fibers can attract most charged particles in the environment like a magnet and polarize the charged particles, so that the electrostatic adsorption effect of the charged particles on expandable graphite particles is improved. To achieve this effect, it is desirable to have expandable graphite particles and mica particles between 0.3 μm and 3.3 μm in diameter. If the particle diameter is larger than this range, electrostatic adsorption may not be achieved. If the particle diameter is smaller than this range, the processing difficulty is too high.
Preferably, the reticular superfine electrostatic fiber can adopt polypropylene non-woven fabric slurry, and under the action of a flame retardant, the polypropylene non-woven fabric can not be ignited under high temperature, can be directly changed into black flocculent powder, and has certain flame retardant, heat insulation and thermal shock absorption properties.
In addition, glue can be added into the expansion coating 110 to provide certain adhesion force to further adsorb the expandable graphite particles and the net-shaped superfine electrostatic fibers.
Furthermore, a layer of flame-retardant non-woven fabric can be adhered to the lower surface of the thermal runaway inhibition thin material, so that the surface wear resistance is improved, and powder falling is prevented. Even if the flame-retardant non-woven fabric is changed into black chalk after being subjected to high temperature, the black chalk is adhered to the surface of the thermal runaway inhibition thin material, and has certain heat insulation and thermal shock delay effects.
As shown in fig. 3, the embodiment of the application further provides a lithium battery module 500, where the lithium battery module 500 includes a lithium battery body 400 and a thermal runaway-suppressing sheet 100 covering the surface of the lithium battery body 400, where the thermal runaway-suppressing sheet 100 is covered with a foamed silica gel layer 200 as described above, and the lithium battery module 500 further includes a conductive connection assembly 300, where the conductive connection assembly 300 is pressed on the foamed silica gel layer 200 and is fixedly connected with the lithium battery body 500 by welding or the like.
The thickness of the foamed silica gel layer 200 and the foaming ratio can be adjusted according to the pole height and rebound requirement of the battery module. The foamed silicone layer 200 serves to fix the thermal runaway-suppressing thin material first, and after the conductive connection assembly 300 is connected to the lithium battery body 500, the foamed silicone layer 200 is compressed while fixing the thermal runaway-suppressing thin material 100. Meanwhile, the foaming silica gel has a good heat insulation effect, and when the heat is out of control, the electrolyte temperature is very high, and the state of the foaming silica gel after being burnt can effectively insulate heat and weaken the heat impact temperature. Also, the foamed silicone layer 200 can prevent the thermal runaway-inhibiting thin material from falling powder, and is more comfortable and wear-resistant as the material surface.
In a possible embodiment, the lithium battery module 510 employs the conductive bars 310 as the conductive connection assembly 300, as shown in fig. 4. After passing through the foamed silicone layer 200 and the thermal runaway suppression sheet 100 (hidden in the figure), the conductive bars 310 are welded and fixed to the lithium battery body 500.
In another possible embodiment, the lithium battery module 510 employs a battery module collecting integrated member 320 (Cells Contact System, CCS) as the conductive connection assembly 300, as shown in fig. 5 (the foamed silicone layer 200 and the thermal runaway inhibiting thin material 100 are hidden by the battery module collecting integrated member 320). CCS is one of the key components of a battery module and a battery pack for connecting the cells, transmitting current and managing the temperature and state of the battery. The copper aluminum bars, the wire harnesses, the plastic structural members and the like are integrated together through the CCS, so that the overall thickness is reduced, and the assembly is more convenient.
To sum up, the thermal runaway suppression thin material and the lithium battery module that this application embodiment provided through adding expandable graphite granule in the expansion coating, can expand when reaching preset temperature interval, and overall thickness increases to the porosity grow, and thermal-insulated effect and thermal shock buffering effect are more outstanding, in order to prevent that thermal runaway from spreading to cause bigger harm to other electric cores. By adding mica particles, the overall toughness can be increased and the heat insulating effect can be improved. Meanwhile, by adding the reticular superfine electrostatic fibers, expandable graphite particles and mica particles can be effectively adsorbed, and powder falling is prevented.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description is of the preferred embodiment of the present application and is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. A thermal runaway-inhibiting thin material suitable for use in a lithium battery capable of being charged and discharged, comprising a base layer and an intumescent coating attached to at least one surface of the base layer, wherein the intumescent coating comprises at least uniformly distributed expandable graphite particles, mica particles and reticulated ultrafine electrostatic fibers; the base layer is an aerogel layer.
2. The thermal runaway-inhibiting sheet of claim 1, wherein the expandable graphite particles have an initial expansion temperature of 100 ° to 300 ℃.
3. The thermal runaway inhibiting sheet of claim 2, wherein the expandable graphite particles and mica particles have a diameter between 0.3 μιη and 3.3 μιη.
4. The thermal runaway-inhibiting sheet of claim 1, wherein the reticulated superfine electrostatic fibers are polypropylene nonwoven.
5. The thermal runaway-inhibiting sheet of claim 4, wherein the reticulated superfine electrostatic fibers are electrostatically electret treated in advance.
6. The thermal runaway-inhibiting sheet of claim 1, wherein the intumescent coating is attached to both the upper and lower surfaces of the base layer.
7. The thermal runaway-inhibiting thin material of claim 6, wherein the overall thickness of the thermal runaway-inhibiting thin material is between 0.4mm and 1 mm.
8. A lithium battery module, characterized in that: the lithium battery module comprises a lithium battery main body and a thermal runaway inhibition thin material covered on the surface of the lithium battery main body, wherein the thermal runaway inhibition thin material is as set forth in any one of claims 1 to 7, a foaming silica gel layer is covered on the thermal runaway inhibition thin material, and the lithium battery module further comprises a conductive connecting component which is pressed on the foaming silica gel layer and fixedly connected with the lithium battery main body.
9. The lithium battery module according to claim 8, wherein: the conductive connecting component is a conductive bar or a battery module collecting integrated piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310320978.5A CN116454483A (en) | 2023-03-29 | 2023-03-29 | Thermal runaway inhibition thin material and lithium battery module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310320978.5A CN116454483A (en) | 2023-03-29 | 2023-03-29 | Thermal runaway inhibition thin material and lithium battery module |
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