CN116885349A - Coating, shell, battery cell, energy storage device and electricity utilization device - Google Patents
Coating, shell, battery cell, energy storage device and electricity utilization device Download PDFInfo
- Publication number
- CN116885349A CN116885349A CN202311047635.2A CN202311047635A CN116885349A CN 116885349 A CN116885349 A CN 116885349A CN 202311047635 A CN202311047635 A CN 202311047635A CN 116885349 A CN116885349 A CN 116885349A
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- Prior art keywords
- coating
- housing
- thickness
- shell
- mass
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- 238000004146 energy storage Methods 0.000 title claims abstract description 28
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- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 50
- 239000004020 conductor Substances 0.000 claims abstract description 50
- 239000011230 binding agent Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000011247 coating layer Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 16
- 229910001593 boehmite Inorganic materials 0.000 claims description 15
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 15
- 239000002033 PVDF binder Substances 0.000 claims description 14
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- 230000036961 partial effect Effects 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims 1
- 238000002844 melting Methods 0.000 abstract description 14
- 230000008018 melting Effects 0.000 abstract description 14
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- 230000035515 penetration Effects 0.000 description 19
- 239000000758 substrate Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 16
- 238000012360 testing method Methods 0.000 description 13
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 12
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 12
- 230000007774 longterm Effects 0.000 description 11
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- 238000004804 winding Methods 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/1243—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the internal coating on the casing
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/121—Organic material
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/1245—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the external coating on the casing
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a coating, a shell, a battery cell, an energy storage device and an electric device. The coating comprises 5 to 40 parts by mass of heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder. The coating has good heat resistance and heat conduction performance, has high bonding strength with a base material, can avoid or reduce the risk of melting through of the base material provided with the coating, improves the high-temperature stability of the base material, and has simple processing technology and low cost.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a coating, a shell, a battery cell, an energy storage device and an electric device.
Background
With the rapid development of consumer electronics and electric automobiles, the requirements of people on batteries are also more and more strict, and the batteries are expected to have the performances of safety, reliability, stability and the like. The battery can be distinguished from the shell material of the battery and comprises a hard shell battery and a soft package battery, wherein the hard shell battery is widely applied in various scenes and occupies a large market share, the hard shell battery usually adopts a metal shell, such as an aluminum shell and the like, the melting point of the metal shell is lower, when the battery is out of control, the internal temperature is rapidly increased, the shell is easily melted through, and the internal substances of the battery are in contact with the outside air, so that the safety problems such as ignition and even explosion of the battery can be caused.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, one object of the invention is a coating, a housing, a battery cell, an energy storage device and an electrical device. The coating has good heat resistance and heat conduction performance, has high bonding strength with a base material, can avoid or reduce the risk of melting through of the base material provided with the coating, improves the high-temperature stability of the base material, and has simple processing technology and low cost.
In a first aspect of the invention, the invention proposes a coating. According to an embodiment of the invention, the coating comprises: 5-40 parts by mass of a heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder.
According to the coating provided by the embodiment of the invention, the heat-conducting material is added to be beneficial to improving the heat dissipation effect of the coating, so that the degree of heat aggregation in a base material (such as a battery shell) can be effectively reduced, and the risk of temperature runaway is avoided or reduced; the ceramic material is added to be beneficial to improving the heat resistance and the melting resistance of the coating, so that the risk of melting through of the base material (such as a battery shell) caused by overhigh internal temperature of the base material can be effectively avoided or reduced; the adhesive is added, so that the coating and the base material have better adhesive force, the bonding strength of the coating and the base material is improved, the risk of falling off of the coating is avoided or reduced, and the smoothness of the surface of the coating is improved. The invention can not only ensure that the coating has better heat resistance and heat conduction performance, but also has higher bonding strength with the base material (such as metal and the like) by comprehensively controlling the dosage of the heat conduction material, the ceramic material and the binder in the coating, and can also avoid or reduce the risk of fusing through the base material provided with the coating, thereby being beneficial to improving the high-temperature resistance stability of the base material.
In addition, the coating according to the above embodiment of the present invention may have the following additional technical features:
in some embodiments of the invention, the coating comprises: 20-35 parts by mass of the heat conducting material; 50-70 parts by mass of the ceramic material; 8 to 12 parts by mass of the binder.
In some embodiments of the invention, the porosity of the coating is no greater than 20%.
In some embodiments of the invention, the thickness of the coating is no greater than 12 μm.
In some embodiments of the invention, the coating is formed using a coating liquid, and the sum of the mass percentages of the thermally conductive material, the ceramic material, and the binder in the coating liquid is 20wt% to 60wt%.
In some embodiments of the invention, the coating has a thickness of 1 μm to 12 μm.
In some embodiments of the invention, the thermal conductivity of the thermally conductive material is not less than 240W/(mK).
In some embodiments of the invention, the thermally conductive material comprises AlN, beO, si 3 N 4 At least one of SiC.
In some embodiments of the invention, the ceramic material comprises at least one of aluminum oxide, boehmite, zirconia, titania.
In some embodiments of the invention, the binder comprises at least one of polyvinylidene fluoride, polyacrylic acid, polymethyl methacrylate, polytetrafluoroethylene.
In some embodiments of the invention, the binder has a molecular weight of 2X 10 5 ～2×10 6 。
In some embodiments of the invention, the ceramic material has a particle size of 10nm to 100nm.
In some embodiments of the invention, the thermally conductive material has a particle size of 1nm to 50nm.
Based on the same inventive concept, in a second aspect of the present invention, the present invention proposes a housing. According to an embodiment of the invention, at least a partial area of at least one of the inner and outer surfaces of the housing is provided with a coating, said coating comprising: 5-40 parts by mass of a heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder.
The shell of the embodiment of the invention has at least the following beneficial effects: by arranging the coating with the composition on at least partial area of at least one of the inner surface and the outer surface of the shell, on one hand, the heat dissipation effect of the surface of the shell is improved, the heat accumulation in the shell can be effectively reduced, and the risk of thermal runaway is avoided or reduced; on the other hand, the heat-resistant and melt-resistant performance of the shell is improved, and the risk of shell penetration caused by overhigh temperature inside the shell is effectively avoided or reduced; in addition, when the shell is used as a battery shell, the insulation performance of the surface of the shell is improved, and the risk of short circuit inside the battery is reduced. In addition, the shell is simple in process and low in processing cost, can avoid or reduce the risk of penetration caused by overhigh temperature, and can be used in a battery to improve the safety and long-term use stability of the battery.
In some embodiments of the invention, the housing comprises a bottom wall and a side wall defining a receiving area, at least part of an inner surface of at least one of the bottom wall and the side wall being provided with the coating.
In some embodiments of the invention, the coating is a coating of the first aspect of the invention.
In some embodiments of the invention, the coating on the bottom wall is distributed over the entire inner surface of the bottom wall or only over the inner surface of the bottom wall circumferential edge area.
In some embodiments of the invention, the coating on the side wall is distributed over the entire inner surface of the side wall or only over the inner surface of the side wall on the side of the side wall adjacent to the bottom wall.
In some embodiments of the invention, the orthographic projection of the coating on the bottom wall on the inner surface of the bottom wall is an annular structure, the outer edge of the annular structure coincides with the outer edge of the bottom wall, the inner edge is a regular or irregular closed pattern, and the interval between the inner edge and the outer edge is not less than 3 times of the thickness of the side wall.
In some embodiments of the invention, the coating on the inner surface of the sidewall extends from the bottom of the sidewall to the height of the sidewall, and the extension height is no less than 1/10 of the height of the sidewall.
In some embodiments of the invention, the spacing between the inner and outer edges of the annular structure is no greater than 1/2 of the horizontal distance from the outer edge of the bottom wall to the center of the bottom wall.
In some embodiments of the invention, the coating on the inner surface of the sidewall extends no more than 4/5 of the height of the sidewall.
In some embodiments of the invention, the thickness h of the coating is: h=n/h 1 Wherein h is 1 For the wall thickness of the shell provided with the coating, h and h 1 The units of (a) are μm, and the value of n is 1500-7500.
In some embodiments of the invention, the shell wall thickness is less than 600 μm and the coating thickness is from 6 μm to 12 μm.
In some embodiments of the invention, the shell wall thickness is 600 μm to 800 μm and the coating thickness is 3 μm to 6 μm.
In some embodiments of the invention, the shell wall thickness is greater than 800 μm and the coating thickness is 1 μm to 3 μm.
In a third aspect of the invention, the invention provides a battery cell. According to an embodiment of the present invention, the battery cell includes: an electrode assembly and a case assembly for accommodating the electrode assembly: the outer surface of the electrode assembly is provided with a coating according to the first aspect of the present invention; and/or the inner surface of the housing assembly is provided with a coating according to the first aspect of the invention or a housing comprising the second aspect of the invention. Features and effects of the coating layer according to the first aspect of the present invention and the housing according to the second aspect of the present invention are equally applicable to the battery cell, and are not described here again. Overall, the battery cell has high safety performance and good long-term use stability.
In some embodiments of the invention, the first housing component comprises a metal housing, the inner surface of which is provided with an insulating layer, which is provided with the coating of the first aspect of the invention on the side facing away from the metal housing.
In a fourth aspect of the invention, the invention provides an energy storage device. According to an embodiment of the present invention, the energy storage device includes the battery cell of the third aspect of the present invention, and features and effects of the battery cell of the third aspect of the present invention are also applicable to the energy storage device, and are not described herein. In general, the energy storage device has better safety performance.
In a fifth aspect of the present invention, the present invention provides an electrical device. According to an embodiment of the invention, the electricity-using device comprises a coating according to the first aspect of the invention, or a housing according to the second aspect of the invention, or a battery cell according to the third aspect of the invention, or an energy storage device according to the fourth aspect of the invention. Features and effects of the coating layer according to the first aspect of the present invention, the housing according to the second aspect of the present invention, the battery cell according to the third aspect of the present invention, and the energy storage device according to the fourth aspect of the present invention are equally applicable to the power utilization device, and are not described herein. Overall, the electrical device has high safety performance and little risk of spontaneous combustion or explosion.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of a housing provided with a coating according to one embodiment of the invention;
FIG. 2 is a schematic view of a housing provided with a coating according to yet another embodiment of the invention;
FIG. 3 is a schematic structural view of a housing provided with a coating according to yet another embodiment of the present invention;
FIG. 4 is a schematic view of a housing provided with a coating according to another embodiment of the invention;
fig. 5 is an exploded view of a battery pack according to an embodiment of the present invention;
fig. 6 is a schematic structural view of an electric device according to an embodiment of the present invention.
Reference numerals illustrate:
100-a housing; 110-a bottom wall; 120-sidewalls; 130-accommodation region;
1000-an electric device; 1000 a-an electrical device body; 1000 b-energy storage device.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention. In the description of the present invention, it should be understood that the terms "center," "thickness," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In a first aspect of the invention, the invention proposes a coating. According to an embodiment of the invention, the coating comprises: 5-40 parts by mass of a heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder.
According to the coating of the embodiment of the invention, the weight part of the heat conducting material can be 5, 10, 15, 20, 25, 30, 35 or 40, and the like, and the addition of the heat conducting material is beneficial to improving the heat dissipation effect of the coating, so that the aggregation degree of heat in a base material (such as a battery shell) can be effectively reduced, the risk of temperature runaway is avoided or reduced, and under the condition that the total weight part of the coating is certain, if the use amount of the heat conducting material is too high, the use amount of the ceramic material is reduced, and once the temperature runaway occurs, the possibility of the base material melting through still exists; the ceramic material can be 50, 60, 65, 70, 75, 80 or 85, and the like, and the addition of the ceramic material is favorable for improving the heat resistance and the melting resistance of the coating, so that the risk of melting through of the base material caused by overhigh internal temperature of the base material (such as a battery shell) can be effectively avoided or reduced, but under the condition that the total mass of the coating is certain, if the content of the ceramic material is overhigh, the consumption of the heat conducting material is reduced, and although the heat resistance of the coating can be improved to a certain extent, less heat conducting material is difficult to effectively diffuse the heat in the base material, the heat concentration is easy to occur, and the base material also has the risk of melting through; the binder can be 5, 7, 9, 11 or 13, and the like, the use of the binder is improved, the binding force between the coating and the substrate is improved, but under the condition that the total mass of the coating is certain, if the use amount of the binder is excessive, the use amount of the heat conducting material and the ceramic material is reduced, the effect of improving the heat conducting performance and the heat resisting performance of the substrate by the coating can be affected, by comprehensively controlling the use amounts of the heat conducting material, the ceramic material and the binder within the given range, the bonding strength between the coating and the substrate is improved, the falling risk of the coating is avoided or reduced, the coating has better heat conducting performance, the coating has better surface smoothness, and when the coating is arranged on the surface of the substrate such as a battery shell, the processing technology is simple, the cost is low, and the safety and the long-term use stability of the battery are improved.
According to some embodiments of the invention, the coating may comprise: 20 to 35 parts by mass of heat conducting material, 50 to 70 parts by mass of ceramic material and 8 to 12 parts by mass of binder. Specifically, the heat conducting material may be 22, 24, 26, 28, 32 or 34, etc.; the ceramic material can be 52, 54, 56, 58, 62, 64, 66 or 68, etc.; the mass portion of the binder can be 8, 10 or 12. By adopting the coating with the composition, the heat dissipation and heat resistance of the coating and the combination effect with a substrate (such as metal) are both more favorable, and the possibility of falling off the coating and the risk of melting through of the coated substrate are further reduced.
According to some embodiments of the present invention, the porosity of the coating may be not more than 20%, for example, the porosity of the coating may be not more than 18%, 16%, 14%, 12% or 10%, etc., and if the porosity of the coating is too high, the density of the heat conductive material and the ceramic material in the coating may be reduced on the one hand, which affects the heat conductive and heat resistant effects of the coating, and on the other hand, the bonding strength between the coating and the substrate may be easily reduced, which affects the long-term use stability of the coating, and in addition, when the above-mentioned coating is used in the battery field, the larger porosity of the coating may easily absorb the electrolyte, which affects the electrochemical performance of the battery. In conclusion, the porosity of the coating is controlled to be not more than 20%, so that the protective effect and long-term use stability of the coating are improved.
According to some embodiments of the present invention, the thickness of the coating layer may be not more than 12 μm (micrometers), for example, the thickness of the coating layer may be not more than 11 μm, 10 μm, 9 μm, 8 μm or 7 μm, etc., and an increase in the thickness of the coating layer is advantageous for improving the high temperature stability of the substrate, but if the thickness is too large, the bonding effect of the whole coating layer with the substrate is easily affected, the risk of falling off or powder falling off of the coating layer is increased, and by controlling the thickness of the coating layer within the given range, the bonding strength between the coating layer and the substrate can be further considered on the basis of improving the high temperature stability and the penetration resistance of the substrate. Further, according to some embodiments of the present invention, the thickness of the coating may be 1 μm to 12 μm, for example, the thickness of the coating may be 2 μm, 3 μm, 5 μm, 7 μm or 9 μm, etc., and controlling the thickness of the coating to meet the given range may better compromise between the protection of the coating from the substrate and the bonding strength to the substrate.
According to some embodiments of the present invention, the coating may be formed using a coating solution, and the sum of the mass percentages of the heat conductive material, the ceramic material, and the binder in the coating solution may be 20wt% to 60wt%, for example, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, or 55wt%, etc., if the sum of the mass percentages of the heat conductive material, the ceramic material, and the binder in the coating solution is too small, on one hand, the porosity of the coating is easily increased, the heat conductive effect, the heat resistant effect, and the long-term stability of the coating are affected, on the other hand, the coating performance may be affected, the excessive waste of the solvent is caused, the coating drying time is prolonged, and the production cost is increased; if the sum of the mass percentages of the heat conductive material, the ceramic material and the binder in the coating liquid is too large, the fluidity of the coating liquid is easily deteriorated, and the problems such as coating difficulty and uneven coating thickness are likely to occur, and defects such as cracks and bubbles are likely to occur in the coating. The invention is beneficial to considering the coating effect and the use performance of the coating by controlling the mass percentages of the heat conducting material, the ceramic material and the binder in the coating liquid in the range. Further, the sum of the mass percentages of the heat conducting material, the ceramic material and the binder in the coating liquid can be selected to be 25-40 wt%, thereby being more beneficial to improving the apparent performance and heat-resistant heat conducting performance of the coating. It should be noted that, in the present invention, the specific type of the solvent is not particularly limited, and those skilled in the art can flexibly select the solvent according to practical situations, for example, the solvent may be a volatile solvent or a volatile solvent; for another example, the solvent may include, but is not limited to, at least one of N-methylpyrrolidone, dimethylacetamide, N-dimethylformamide, triethylphosphate, dimethylsulfoxide.
According to some embodiments of the present invention, at 25 ℃, the thermal conductivity of the thermal conductive material may be not lower than 240W/(m·k), for example, the thermal conductivity of the thermal conductive material may be 250W/(m·k), 260W/(m·k), 270W/(m·k), or 280W/(m·k), which satisfies the given thermal conductivity range, has better thermal conductivity, and when the thermal conductive material is used in the coating, the coating has better thermal conductivity and heat dissipation effects, and the risk of heat concentration of the substrate is reduced. The term W/(mK) is a unit of thermal conductivity, and the Chinese definition is W/(mKelvin).
According to some embodiments of the invention, the thermally conductive material of the invention may include, but is not limited to AlN, beO, si 3 N 4 At least one of SiC and the heat conducting material has better heat conducting capacity, and when the heat conducting material is used in a coating, the coating has better heat conducting and radiating effects, and the risk of heat concentration of a base material is reduced.
According to some embodiments of the invention, the particle size of the thermally conductive material may be 1nm (nanometer) to 50nm (nanometer), for example, may be 5nm, 10nm, 15nm, 20nm, 30nm, 40nm, 45nm, or the like. If the particle size of the heat conducting material is too large, contact points among the heat conducting materials are easy to reduce, and the formation of a heat conducting passage is limited, so that the heat conducting effect of the coating is affected; if the particle size of the heat conducting material is too small, agglomeration is easy to occur among the heat conducting materials, so that dispersibility is poor, and heat conduction is also affected. The particle size of the heat conducting material is controlled within the range, so that the heat conducting and radiating effects of the heat conducting material and the coating can be further exerted.
According to some embodiments of the present invention, the specific type of the ceramic material is not particularly limited, and a person skilled in the art can flexibly select the ceramic material according to practical situations, for example, the ceramic material may include at least one of aluminum oxide, boehmite, zirconia and titania, and the ceramic material has better heat resistance, and when the ceramic material is used in a coating, the heat resistance of the coating and a substrate can be effectively improved, and the risk of melting through of the substrate is reduced.
According to some embodiments of the invention, the particle size of the ceramic material may be 10nm to 100nm, for example, 20nm, 30nm, 40nm, 50nm, 60nm, 70nm, 80nm or 90nm, etc., or may be in the range of any of the above values. If the particle size of the ceramic material is too small, the ceramic material is easy to agglomerate, the dispersion effect is poor, and the improvement effect on the overall heat-resistant penetration of the base material is not facilitated; if the particle size of the ceramic material is too large, the dispersion uniformity of the ceramic material in the coating liquid is easily affected, and the heat-resistant uniformity and stability of the coating layer are further affected. The invention is beneficial to considering the heat-resistant effect and the coating stability of the coating by controlling the grain diameter of the ceramic material to be in the range.
According to some embodiments of the present invention, dv50 of the ceramic material may be 2-10 times that of the heat conductive material, for example, dv50 of the ceramic material may be 3 times, 5 times, 7 times, or 9 times that of the heat conductive material, and the particle size relationship between the ceramic material and the heat conductive material is controlled within a given range, the ceramic material with a larger particle size may be used to support the coating layer, so as to improve heat stability of the coating layer, and at the same time, the gaps formed between the ceramic materials may be used to fill the heat conductive material with a smaller particle size, thereby being more beneficial to both heat resistance and heat conductivity of the coating layer, and further reducing the risk of melting through of the substrate provided with the coating layer. The Dv50 refers to the particle size of the ceramic material when the ceramic material reaches 50% of the volume accumulation from the small particle size side in the volume-based particle size distribution.
According to some embodiments of the present invention, the specific type of the binder is not particularly limited in the present invention, and a person skilled in the art may flexibly select the binder according to the actual situation, for example, the binder may include, but is not limited to, at least one of polyvinylidene fluoride, polyacrylic acid, polymethyl methacrylate, and polytetrafluoroethylene. The adhesive has good adhesion, and can be kept stable under the infiltration of electrolyte when the coating is used on the surface of the battery shell, so that the risk of powder falling or falling is reduced.
According to some embodiments of the invention, the binder may have a molecular weight of 2×10 5 ～2×10 6 For example, it may be 3X 10 5 、4×10 5 、5×10 5 、6×10 5 、7×10 5 、8×10 5 Or 9X 10 5 And the like, by controlling the molecular weight of the binder in the above range, the viscosity of the coating liquid is moderate, the coating performance of the coating liquid is improved, the porosity of the coating is reduced, the better bonding capability is obtained, the heat conduction and heat resistance effects of the coating are further improved, and the long-term use stability of the coating is improved.
Based on the same inventive concept, in a second aspect of the present invention, the present invention proposes a housing. As will be appreciated in connection with fig. 1, at least a partial region of at least one of the inner and outer surfaces of the housing 100 is provided with a coating according to an embodiment of the present invention, the coating comprising: 5-40 parts by mass of a heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder.
According to the shell, the coating layer with the composition is arranged on at least part of the area of at least one of the inner surface and the outer surface of the shell, so that on one hand, the heat dissipation effect of the surface of the shell is improved, heat accumulation in the shell can be effectively reduced, and the risk of thermal runaway is avoided or reduced; on the other hand, the heat-resistant and melt-resistant performance of the shell is improved, and the risk of shell penetration caused by overhigh temperature inside the shell is effectively avoided or reduced; in addition, when the shell is used as a battery shell, the insulation performance of the surface of the shell is improved, and the risk of short circuit inside the battery is reduced. In addition, the shell is simple in process and low in processing cost, can avoid or reduce the risk of penetration caused by overhigh temperature, and can be used in a battery to improve the safety and long-term use stability of the battery.
According to some embodiments of the present invention, as will be appreciated in connection with fig. 1, the housing 100 may include a bottom wall 110 and a side wall 120, the bottom wall 110 and the side wall 120 defining a receiving area 130, at least a portion of an inner surface of at least one of the bottom wall 110 and the side wall 120 being provided with a coating. The coating is arranged on the outer surface of the shell, so that the risk of the shell penetration can be reduced, but the coating is easy to strike or wear, and powder falling or falling off is generated. The present invention facilitates better integrity and higher stability of the coating during use by providing the coating on at least a portion of the inner surface of at least one of the bottom wall 110 and the side wall 120.
According to some embodiments of the present invention, the coating layer provided on the housing 100 may be the coating layer of the first aspect of the present invention, and by providing the coating layer of the first aspect of the present invention on at least part of the inner surface of at least one of the bottom wall and the side wall of the housing, the risk of the housing being penetrated by melting can be reduced, and the safety and reliability of the housing in long-term use can be improved.
According to some embodiments of the present invention, it is understood in connection with fig. 1-2 that the coating on the bottom wall 110 may be distributed over the entire inner surface of the bottom wall 110 (see the shaded portion on the bottom wall in fig. 1), or only over the inner surface of the circumferential edge area of the bottom wall 110 (see the shaded portion on the bottom wall in fig. 2). The casing can be the metal casing, when using in the battery, under the inside circumstances that takes place thermal runaway of battery, probably make the metal melt produce the molten bead, the molten bead drops easily at the casing diapire, makes the diapire take place to melt through, through making the coating distribution that is located on diapire 110 on the whole internal surface of diapire 110, can protect comprehensively to whole diapire, reduces the diapire and is fused the risk of wearing. Further, the thickness of the bottom wall of the battery shell is generally greater than that of the side wall, in the process of preparing the battery shell, machining (such as stamping) is generally required to be performed on the circumferential edge area of the bottom wall, compared with the central area of the bottom wall, the circumferential edge area of the bottom wall is generally weak, and the risk of penetration is easier to occur.
According to some specific examples of the present invention, when the coating on the bottom wall 110 is only distributed on the inner surface of the circumferential edge region of the bottom wall 110, the orthographic projection of the coating on the inner surface of the bottom wall 110 on the bottom wall 110 may be an annular structure, and as understood in connection with fig. 2, the outer edge of the annular structure may coincide with the outer edge of the bottom wall 110, the inner edge may be a regular or irregular closed pattern (e.g., may be rectangular, circular, oval, etc.), the interval between the inner edge and the outer edge may be not less than 3 times the thickness of the side wall, for example, the interval between the inner edge and the outer edge may be 4 times, 5 times, 6 times, etc. the thickness of the side wall, and by controlling the interval between the inner edge and the outer edge of the coating on the bottom wall to be a given range, it is advantageous to reduce the risk of being fused through at the corners of the bottom wall of the housing under the control of costs. Further, the interval between the inner edge and the outer edge of the annular structure may be not more than 1/2 of the horizontal distance from the outer edge of the bottom wall to the center of the bottom wall, thereby enabling to have a better heat-resistant stability, reducing the processing cost of the housing, and reducing the influence on the energy density of the battery.
According to some embodiments of the present invention, as will be appreciated in conjunction with fig. 3-4, the coating on the sidewall 120 may be distributed over the entire inner surface of the sidewall 120 (see the shaded portion on the sidewall in fig. 3), thereby providing overall protection to the entire sidewall and improving the safety performance of the housing; alternatively, the coating layer on the side wall 120 may be distributed only on the inner surface of the side wall 120 on the side close to the bottom wall 110 (refer to the hatched portion on the side wall in fig. 4), since the beads drop down from top to bottom when thermal runaway occurs inside the case, the case side wall against the bottom wall is more likely to melt through than the case side wall upper portion, and by distributing the coating layer on the side wall on the inner surface of the side wall on the side close to the bottom wall, not only the safety performance of the battery can be improved, but also the production cost can be further reduced, and the energy density of the battery can be improved.
According to some specific examples of the present invention, the coating layer on the inner surface of the sidewall 120 may extend from the bottom of the sidewall 120 toward the height direction of the sidewall 120, and the extending height may be not less than 1/10 of the sidewall height, for example, the extending height may be 1/9, 1/8, 1/7, or 1/6 of the sidewall height, etc., whereby the risk of the sidewall being melted through may be effectively reduced; meanwhile, the extension height can be not more than 4/5 of the height of the side wall, for example, the extension height can be 3/5, 2/5, 1/5 and the like of the height of the side wall, so that the risk of fusing through of the shell can be reduced, adverse effects of the coating on the welding of the cover plate and the shell can be avoided, and meanwhile, the integrity and stability of the coating can be prevented from being influenced by high temperature during the welding of the shell and the cover plate.
According to some embodiments of the invention, the thickness h of the coating may be: h=n/h 1 Wherein h is 1 For the wall thickness of the shell provided with a coating, h and h 1 The units of (a) are μm, and the value of n may be 1500 to 7500, for example, n may be 1600, 2000, 3000, 4000, 5000, 6000 or 7000. When the wall thickness of the shell is large, the risk of melting through of the shell at high temperature is reduced, so that the thickness of the coating can be reduced along with the increase of the wall thickness of the shell provided with the coating, thereby not only improving the thermal stability of the shell, but also reducing the processing cost of the shell, being beneficial to avoiding the waste of raw materials, and simultaneously reducing the influence of the coating on the energy density of the battery.
According to some specific examples of the invention, when the wall thickness of the housing is less than 600 μm, the thickness of the coating may be 6 μm to 12 μm; when the wall thickness of the shell is 600-800 mu m, the thickness of the coating can be 3-6 mu m; when the wall thickness of the shell is greater than 800 μm, the thickness of the coating may be 1 μm to 3 μm. The wall thickness and the coating thickness of the shell are controlled within the given ranges, so that the cost is further reduced on the basis of improving the heat-resistant stability of the shell and reducing the penetration risk of the shell, and meanwhile, the influence on the energy density of the battery caused by the overlarge sum of the thicknesses of the shell and the coating can be avoided. When the thickness of the bottom wall and the thickness of the side wall of the shell are different, the thicknesses of the coatings on the bottom wall and the side wall can be different, the thickness of the coating on the bottom wall can be adaptively adjusted based on the thickness of the bottom wall of the shell, and the thickness of the coating on the side wall can be adaptively adjusted based on the thickness of the side wall of the shell.
In a third aspect of the invention, the invention provides a battery cell. According to an embodiment of the present invention, the battery cell includes: an electrode assembly and a case assembly for accommodating the electrode assembly: the outer surface of the electrode assembly is provided with a coating according to the first aspect of the present invention; and/or the inner surface of the housing assembly is provided with a coating according to the first aspect of the invention or a housing comprising the second aspect of the invention. Features and effects of the coating layer according to the first aspect of the present invention and the housing according to the second aspect of the present invention are equally applicable to the battery cell, and are not described here again. Overall, the battery cell has high safety performance and good long-term use stability.
According to some embodiments of the present invention, the specific structure of the electrode assembly is not particularly limited, and a person skilled in the art may flexibly select the specific structure according to practical situations, for example, the electrode assembly may be a winding structure or a lamination structure, the coating of the first aspect of the present invention may be provided on the outer surface of the winding structure or the lamination structure, and the provision of the coating of the first aspect of the present invention on the outer surface of the electrode assembly may also reduce the risk of the battery cell fusing through and improve the safety performance of the battery cell.
According to some embodiments of the invention, the first housing component may comprise a metal housing, the inner surface of which may be provided with an insulating layer, which may be provided with the coating of the first aspect of the invention on the side facing away from the metal housing. By arranging the insulating layer and arranging the coating of the first aspect on the insulating layer, the risk of electric leakage can be reduced, the risk of fusion through of the battery monomer can be further reduced, and the safety and stability of the battery are improved.
It should be noted that, in the present invention, the specific type of the battery cell is not particularly limited, and a person skilled in the art may flexibly select the battery cell according to practical situations, for example, the battery cell may be a square battery cell or a cylindrical battery cell; for another example, the battery cell may be a liquid battery or a semi-solid battery; for another example, the battery cell may be a lithium battery, a sodium battery, or the like.
In a fourth aspect of the invention, the invention provides an energy storage device. According to an embodiment of the present invention, the energy storage device includes the battery cell of the third aspect of the present invention, and features and effects of the battery cell of the third aspect of the present invention are also applicable to the energy storage device, and are not described herein. In general, the energy storage device has better safety performance. As some specific examples, the specific composition of the energy storage device may take on a configuration conventional in the art, e.g., the energy storage device may include a plurality of battery cells. It should be noted that, in the present invention, the specific type of the energy storage device is not particularly limited, and those skilled in the art can flexibly select the energy storage device according to practical situations, for example, the energy storage device may be a battery cell, a battery pack (understood by referring to fig. 5) or a battery module including the battery cell, and for example, the battery pack may include a plurality of battery modules, and each battery module may include a plurality of battery cells independently. In addition, it is also understood that the energy storage device may further include, but is not limited to, conventional structural components such as a lower case, a cover plate, and an end plate for packaging the battery cells or the battery module, in addition to the battery cells.
In a fifth aspect of the present invention, the present invention provides an electrical device. According to an embodiment of the present invention, the power consumption device comprises a coating according to the first aspect of the present invention, or a housing according to the second aspect of the present invention, or a battery cell according to the third aspect of the present invention, or an energy storage device according to the fourth aspect of the present invention, for example, as will be appreciated with reference to fig. 6, the power consumption device 1000 may comprise a power consumption device body 1000a and an energy storage device 1000b, the energy storage device 1000b may be electrically connected with the power consumption device body 1000a and adapted to supply power to the power consumption device body 1000 a. It should be noted that the features and effects of the coating layer according to the first aspect of the present invention, the housing according to the second aspect of the present invention, the battery cell according to the third aspect of the present invention, and the energy storage device according to the fourth aspect of the present invention are applicable to the power utilization device as well, and are not described herein again. Overall, the electrical device has high safety performance and little risk of spontaneous combustion or explosion. In addition, it should be noted that, in the present invention, there is no particular limitation on the specific type of the electric device, and those skilled in the art may flexibly select the electric device according to practical situations, for example, the electric device may include, but is not limited to, an electronic device, a vehicle, an aircraft, a domestic appliance, and the like.
Embodiments of the present invention are described in detail below. The following examples are illustrative only and are not to be construed as limiting the invention. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
(1) A square aluminum shell is selected as a battery shell, the wall thickness of the bottom wall of the shell is 1.5mm, the side wall comprises two opposite wide surfaces and two narrow surfaces, wherein the wall thickness of the wide surface of the side wall is 0.6mm, and the wall thickness of the narrow surface of the side wall is 0.8mm;
(2) The coating liquid comprises aluminum nitride, boehmite, PVDF and a solvent NMP, wherein the sum of the mass percentages of the aluminum nitride, the boehmite and the PVDF in the coating liquid is 30wt%, and the mass ratio of the aluminum nitride, the boehmite and the PVDF is 10:80:10;
(3) Coating the inner surface of the battery shell by adopting the coating liquid, wherein the coating on the bottom wall is distributed on the whole inner surface of the bottom wall, and the thickness of the coating is 2 mu m; the coating layer on the side wall is only distributed on the inner surface of the side wall near the bottom wall, extends from the bottom of the side wall to the height direction of the side wall, and has the extension height of 1/10 of the height of the side wall, and the thickness of the coating layer is 4 mu m.
Example 2
The difference compared to example 1 is that in step (3) the coating on the side walls extends over a height of 1/4 of the height of the side walls.
Example 3
The difference compared to example 1 is that in step (3) the coating on the side walls extends over a height of 4/5 of the height of the side walls.
Example 4
The difference compared to example 1 is that in step (3) the coating on the side walls extends to a height of 5/6 of the height of the side walls.
Example 5
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 20:70:10.
Example 6
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 30:60:10.
Example 7
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 5:10:5.
Example 8
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 40:45:15.
Example 9
The difference compared to example 2 is that in step (3), the thickness of the coating on the bottom wall is 1 μm and the thickness of the coating on the side wall is 2 μm.
Example 10
The difference compared to example 2 is that in step (3), the thickness of the coating on the bottom wall is 3 μm and the thickness of the coating on the side wall is 6 μm.
Comparative example 1
The difference from example 1 is that the battery case is not subjected to the coating treatment.
Comparative example 2
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 3:87:10.
Comparative example 3
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 5:92:3.
Comparative example 4
The difference compared to example 2 is that in step (2), the mass ratio of aluminum nitride, boehmite and PVDF is 50:40:10.
The distinguishing characteristics of examples 1 to 10 and comparative examples 1 to 4 are shown in Table 1.
Table 1 distinguishing characteristics of examples 1 to 10 and comparative examples 1 to 4
And (3) battery assembly and test:
the battery cases prepared in examples 1 to 10 and comparative examples 1 to 4 were assembled to form batteries, respectively. The specific process is as follows:
(1) coiling the positive pole piece, the negative pole piece and the diaphragm into a battery core in a coiling mode, and connecting the coiled core with a battery top cover;
(2) Inserting the winding core into the battery shell, and welding the shell and the top cover;
(3) Baking and injecting liquid into the welded battery core, then adopting a chemical component containing cabinet to perform chemical component containing, and then performing high-temperature aging standing and warehouse discharging on the battery core;
(4) The electrical cores in the lower bin are arranged according to the design requirement of the module, the electrical cores are connected together by adopting laser welding, then the safety test is carried out on the module by adopting a module overcharge test method (5.3.3.1) and a thermal runaway test method (5.3.3.7) in GBT36276-2078, and the test results are recorded as shown in table 1.
Other testing methods:
(1) Testing the penetration rate: disassembling the battery subjected to the safety test, taking out the aluminum shell, carrying out section cutting treatment on the aluminum shell, observing the penetration depth of the wide surface of the side wall of the aluminum shell, marking as h, and when h is more than or equal to 0.95 of the wall thickness of the wide surface of the side wall of the aluminum shell, obtaining penetration; the penetration rate was calculated, 5 points were taken respectively from the aluminum case side wall broad faces of the above examples and comparative examples, and the average value of the penetration rate was calculated, wherein the penetration rate=the depth h at which the aluminum case side wall broad face was penetrated by penetration/the aluminum case side wall broad face wall thickness×100%. The results are shown in Table 2.
(2) Testing the laser welding reject ratio of the top cover shell: after the top cover is welded, helium is pumped into the aluminum shell from the liquid injection port, the leak detection air pressure is kept at 40Pa, and the pressure maintaining time is 5s. Judging a qualification standard: the leak rate is less than or equal to 9.9X10 -7 。
The test results are shown in Table 2.
(3) Test coating and shell peel strength: 1. coating the coating on an aluminum plate with 600mm multiplied by 100mm, wherein the coating area is 400mm multiplied by 50mm; 2. using a 3M single-sided adhesive tape with the specification of 200mm multiplied by 25mm to adhere to the coating; 3. tearing half of the adhesive tape; 4. the peel force was measured with a universal tensile machine.
The test results are shown in Table 2.
(4) The relative cost is as follows: the relative cost was calculated by calculating the ratio of the cost of each example or comparative example to the cost of comparative example 1 based on the cost of comparative example 1, and the calculation results are shown in table 2.
(5) Testing the temperature of the center of the wide surface of the side wall of the aluminum shell: the test conditions were that 0.5P charge and discharge conditions were employed during normal use of the battery, where P was rated power and the test results are shown in table 2.
Table 2 test results of examples 1 to 10 and comparative examples 1 to 4
Note that: PASS means PASS; NG indicates failed.
Results and discussion:
according to the test results, the battery shell prepared by the coating provided by the embodiment of the application has lower penetration risk, is less likely to fire and explode under the conditions of overcharge and thermal runaway, is beneficial to improving the safety and reliability of the battery, and has higher bonding strength with the shell, and lower risk of falling or slag falling. Specifically, in comparative example 1, compared with examples 1 to 10, no coating was provided on the surface of the case, and when safety test was performed, the case was melt-through, and the safety performance of the battery was poor; the aluminum nitride content in comparative example 2 is relatively low, and the temperature rise of the module is high under the normal charge and discharge conditions, so that the cycle life of the battery is easily influenced; in comparative example 3, the content of boehmite is relatively high, the content of binder PVDF is low, the risk of penetration of the shell is high under the condition of overcharging or thermal runaway of the battery, meanwhile, the bonding strength of the coating and the shell is poor, the phenomena of falling or powder falling easily occur, and the long-term use stability is poor; in comparative example 4, the content of aluminum nitride was relatively high, the content of boehmite was relatively low, and the penetration resistance of the shell was also affected, while the cost of the raw material for the coating was increased. In summary, the battery case of the above embodiment of the present application has the advantages of low processing cost, and being beneficial to improving the heat resistance and the thermal conductivity of the battery case, avoiding or reducing the risk of the case being melted through, and improving the safety and the reliability of the battery by providing the coating.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (17)
1. A coating, comprising: 5-40 parts by mass of a heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder.
2. The coating of claim 1, comprising: 20-35 parts by mass of the heat conducting material; 50-70 parts by mass of the ceramic material; 8 to 12 parts by mass of the binder.
3. The coating according to claim 1 or 2, characterized in that the porosity of the coating is not more than 20%; and/or the thickness of the coating is not more than 12 μm.
4. A coating according to claim 3, wherein the coating is formed using a coating liquid, and the sum of the mass percentages of the heat conductive material, the ceramic material and the binder in the coating liquid is 20-60 wt%; and/or the number of the groups of groups,
the thickness of the coating is 1-12 mu m.
5. The coating of claim 1 or 4, wherein at least one of the following conditions is met:
the heat conduction coefficient of the heat conduction material is not lower than 240W/(m.K);
the thermally conductive material comprises AlN, beO, si 3 N 4 At least one of SiC;
the ceramic material comprises at least one of aluminum oxide, boehmite, zirconia and titanium oxide;
the binder comprises at least one of polyvinylidene fluoride, polyacrylic acid, polymethyl methacrylate and polytetrafluoroethylene.
6. The coating of claim 1 or 4, wherein at least one of the following conditions is met:
the molecular weight of the binder is 2×10 5 ～2×10 6 ；
The Dv50 of the ceramic material is 2-10 times of the Dv50 of the heat conducting material;
the grain diameter of the ceramic material is 10 nm-100 nm;
the particle size of the heat conducting material is 1 nm-50 nm.
7. A housing, wherein at least a partial region of at least one of an inner surface and an outer surface of the housing is provided with a coating, the coating comprising: 5-40 parts by mass of a heat conducting material; 45-90 parts by mass of ceramic material; 5 to 15 parts by mass of a binder.
8. The housing of claim 7, comprising a bottom wall and a side wall defining a receiving area, at least a portion of an inner surface of at least one of the bottom wall and the side wall being provided with the coating.
9. The housing of claim 8, wherein at least one of the following conditions is satisfied:
the coating is the coating of any one of claims 1 to 6;
the coating on the bottom wall is distributed over the entire inner surface of the bottom wall or only over the inner surface of the circumferential edge area of the bottom wall;
The coating on the side wall is distributed over the entire inner surface of the side wall or only over the inner surface of the side wall on the side of the side wall adjacent to the bottom wall.
10. The housing according to claim 8 or 9, wherein the orthographic projection of the coating on the bottom wall on the inner surface of the bottom wall is an annular structure, the outer edge of the annular structure coincides with the outer edge of the bottom wall, the inner edge is a regular or irregular closed pattern, and the distance between the inner edge and the outer edge is not less than 3 times the thickness of the side wall; and/or the number of the groups of groups,
the coating layer on the inner surface of the side wall extends from the bottom of the side wall to the height direction of the side wall, and the extending height is not less than 1/10 of the height of the side wall.
11. The housing of claim 10, wherein a spacing between an inner edge and an outer edge of the annular structure is no more than 1/2 of a horizontal distance from the bottom wall outer edge to the bottom wall center; and/or the number of the groups of groups,
the coating on the inner surface of the sidewall has an extension height of no more than 4/5 of the height of the sidewall.
12. The housing according to claim 8 or 11, wherein the thickness h of the coating is: h=n/h 1 Wherein h is 1 For the wall thickness of the housing provided with the coating, h and h 1 The units of (a) are μm, and the value of n is 1500-7500.
13. The housing of claim 12, wherein one of the following conditions is satisfied:
the wall thickness of the shell is smaller than 600 mu m, and the thickness of the coating is 6 mu m-12 mu m;
the wall thickness of the shell is 600-800 mu m, and the thickness of the coating is 3-6 mu m;
the wall thickness of the shell is more than 800 mu m, and the thickness of the coating is 1 mu m-3 mu m.
14. A battery cell, comprising: an electrode assembly and a case assembly for accommodating the electrode assembly:
the outer surface of the electrode assembly is provided with the coating according to any one of claims 1 to 6; and/or the number of the groups of groups,
the housing assembly inner surface is provided with a coating as claimed in any one of claims 1 to 6 or comprises a housing as claimed in any one of claims 7 to 13.
15. The battery cell of claim 14, wherein the housing assembly comprises a metal housing having an insulating layer on an inner surface thereof, the insulating layer having the coating of any one of claims 1-6 on a side thereof remote from the metal housing.
16. An energy storage device, comprising: the battery cell of claim 14 or 15.
17. An electrical device, comprising: the coating of any one of claims 1 to 6, or the housing of any one of claims 7 to 13, or the battery cell of claim 14 or 15, or the energy storage device of claim 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311047635.2A CN116885349A (en) | 2023-08-18 | 2023-08-18 | Coating, shell, battery cell, energy storage device and electricity utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311047635.2A CN116885349A (en) | 2023-08-18 | 2023-08-18 | Coating, shell, battery cell, energy storage device and electricity utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116885349A true CN116885349A (en) | 2023-10-13 |
Family
ID=88264635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311047635.2A Pending CN116885349A (en) | 2023-08-18 | 2023-08-18 | Coating, shell, battery cell, energy storage device and electricity utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116885349A (en) |
-
2023
- 2023-08-18 CN CN202311047635.2A patent/CN116885349A/en active Pending
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