CN113228382A - Power supply device and heat insulating sheet for power supply device - Google Patents
Power supply device and heat insulating sheet for power supply device Download PDFInfo
- Publication number
- CN113228382A CN113228382A CN201980083420.1A CN201980083420A CN113228382A CN 113228382 A CN113228382 A CN 113228382A CN 201980083420 A CN201980083420 A CN 201980083420A CN 113228382 A CN113228382 A CN 113228382A
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- CN
- China
- Prior art keywords
- heat insulating
- insulating sheet
- power supply
- supply device
- secondary battery
- Prior art date
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- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
-
- 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
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- 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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
-
- 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
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
-
- 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
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/647—Prismatic or flat cells, e.g. pouch cells
-
- 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
- H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
-
- 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
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
- H01M50/227—Organic material
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- 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
- H01M50/238—Flexibility or foldability
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- 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
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
-
- 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
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
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- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
Abstract
The invention provides a heat insulating sheet with improved deformation following performance. The heat insulating sheet for a power supply device is a heat insulating sheet for insulating a plurality of secondary battery cells 20 stacked so as to be connected in series and/or in parallel with each other, and is composed of an insulating rubber composition having a compression elastic modulus of 4000 to 10000 kPa. Therefore, the following advantages are provided: even when the secondary battery cells 20 are thermally expanded or contracted, the heat insulating sheet having a low compressive elastic modulus and a high compressive recovery rate is interposed between the secondary battery cells 20, and therefore, the heat insulating sheet exhibits conformability to deformation and is easily restored to the original shape.
Description
Technical Field
The invention relates to a power supply device and a heat insulating sheet for the power supply device.
Background
A power supply device obtained by stacking a plurality of rectangular or cylindrical secondary battery cells is used as a driving power supply for an electric vehicle such as an electric car, a hybrid car, an electric bus, and an electric train, or a storage battery for a backup power supply for a factory or a base station, or for a household. In recent years, a power supply device is required to be lightweight and have a high capacity, and a high capacity battery such as a lithium ion secondary battery is used as a secondary battery cell.
On the other hand, when a large number of high-capacity secondary battery cells such as lithium ion secondary batteries are used, one secondary battery cell may become high in temperature due to some cause, causing thermal runaway, and adversely affecting the other adjacent secondary battery cells. Therefore, it is required to thermally insulate adjacent secondary battery cells from each other.
Conventionally, a plate material obtained by hardening sepiolite powder, such as a separator or a separator, or an insulating resin plate, has been disposed between the secondary battery cells to insulate and insulate the adjacent secondary battery cells from each other. However, there are problems as follows: these plate materials are hard and hardly deformed, and therefore cannot follow the deformation of the secondary battery cells. Namely, it is known that: the rectangular secondary battery cell expands and contracts due to charge and discharge. In particular, since the plate material inserted between the secondary battery cells is deformed by the secondary battery cells arranged on both sides, it is necessary to follow the deformation on both sides of the plate material independently and to return to the original shape. In addition, there is a tendency that: the increase in the capacity of the secondary battery cell also increases the amount of deformation of each outer can.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-152138
Non-patent document
Non-patent document 1: fugang pure first-class survey of thermal runaway occurrence method for lithium ion battery for automobile "JARI Research Journal 20140606
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to: provided is a heat insulating sheet for a power supply device, which has improved followability to deformation.
According to the heat insulating sheet for a power supply device of the first aspect of the present invention, the heat insulating sheet is used for insulating a plurality of secondary battery cells stacked so as to be connected in series and/or in parallel with each other, and is composed of an insulating rubber composition, and has a compressive modulus of elasticity of 4000 to 10000 kPa. According to the above structure, the following advantages are provided: even when the secondary battery cells are thermally expanded or contracted, the heat insulating sheet having a low compressive elastic modulus and a high compressive recovery rate is interposed between the secondary battery cells, and therefore, the heat insulating sheet exhibits a follow-up property with respect to deformation and easily recovers to the original shape.
In addition to the above configuration, the heat insulating sheet for a power supply device according to the second aspect may have a weight change of 120 wt% or less when immersed in water for 10 minutes. With the above configuration, the heat insulating sheet for a power supply device has high water repellency and high stability in which a change in thermal conductivity due to moisture absorption is suppressed.
Further, according to the heat insulating sheet for a power supply device of the third aspect, in addition to any one of the above configurations, the heat insulating sheet may have a thermal conductivity of 0.03 to 0.30W/mK.
Further, according to the heat insulating sheet for a power supply device of the fourth aspect, in addition to any one of the above configurations, the water absorption property of the heat insulating sheet may be 120% or less.
Further, according to the heat insulating sheet for a power supply device of the fifth aspect, in addition to any one of the above configurations, the heat resistant temperature of the heat insulating sheet may be 400 ℃.
Further, according to the heat insulating sheet for a power supply device of the sixth aspect, in addition to any one of the above configurations, the film thickness of the heat insulating sheet may be set to 0.1mm to 1.9 mm.
Further, according to the heat insulating sheet for a power supply device of the seventh aspect, in addition to any one of the above configurations, the heat insulating sheet may include: a fibrous base material, a filler material, and a binder material.
Further, according to the heat insulating sheet for a power supply device of the eighth aspect, in addition to any one of the above configurations, the heat insulating sheet may include: natural pulp and inorganic fibers as the fiber base material, silicate mineral as the filler, and a rubber composition as the binder.
Further, according to the heat insulating sheet for a power supply device of the ninth aspect, in addition to any one of the above configurations, the compression recovery rate of the heat insulating sheet may be 1.0 to 5.0%.
Further, according to the heat insulating sheet for a power supply device of the tenth aspect, in addition to any one of the above configurations, it may be interposed between adjacent ones of the plurality of secondary battery cells.
Further, according to the heat insulating sheet for a power supply device of the eleventh aspect, in addition to any of the above configurations, it may be used as a buffer sheet interposed between an explosion-proof valve that is opened upon detection of an increase in the internal pressure of an outer can of the secondary battery cell and a gas duct for guiding high-temperature and high-pressure gas discharged from the explosion-proof valve to the outside.
Further, according to the heat insulating sheet for a power supply device of the twelfth aspect, in addition to any one of the above configurations, it is possible to use as a heat insulating material for any one of the plurality of secondary battery cells, the heat insulating material being interposed between the explosion-proof valve and the circuit board so as to prevent high-pressure and high-temperature gas or electrolyte discharged from the explosion-proof valve that is opened upon detection of an increase in the internal pressure of the outer can of the secondary battery cell from being scattered to the inner lid or the circuit board.
Furthermore, according to the heat insulating sheet for a power supply device of the thirteenth aspect, in addition to any of the above configurations, it is possible to use as a heat insulating material that is interposed between the battery laminate modules obtained by laminating the plurality of secondary battery cells so as to prevent heat transfer between adjacent modules.
Further, according to a fourteenth aspect, the power supply device includes: a plurality of secondary battery cells stacked so as to be connected in series and/or in parallel with each other; and an insulating heat insulating sheet interposed between adjacent secondary battery cells, wherein the heat insulating sheet is a rubber composition and can have a heat resistance temperature of 400 ℃ or higher. According to the above structure, the following advantages are provided: even when the secondary battery cells are thermally expanded or contracted, the heat insulating sheet having a low compressive elastic modulus and a high compressive recovery rate is interposed between the secondary battery cells, and therefore, the heat insulating sheet exhibits a follow-up property with respect to deformation and easily recovers to the original shape.
Further, according to a fifteenth aspect, the power supply device includes: a plurality of secondary battery cells stacked so as to be connected in series and/or in parallel with each other; a gas duct connected to an explosion-proof valve provided in each of the plurality of secondary battery cells and opened when an increase in internal pressure of an outer can of the secondary battery cell is detected, the gas duct being configured to guide high-pressure gas discharged from the explosion-proof valve to the outside; and a heat insulating sheet interposed between the air duct and the explosion-proof valve of each secondary battery cell, and hermetically connecting the air duct and the explosion-proof valve, wherein the heat insulating sheet is a rubber composition and can have a heat-resistant temperature of 400 ℃ or higher. According to the above configuration, high-pressure gas can be guided from the explosion-proof valve into the gas passage in an airtight manner while exhibiting heat insulation properties.
Drawings
Fig. 1 is an exploded perspective view showing a power supply device according to embodiment 1 of the present invention.
FIG. 2 is a graph showing the results of a water absorption evaluation test performed on samples of the heat insulating sheets according to examples 1 to 2 and comparative examples 1 to 6.
FIG. 3 is a graph showing the results of compression and recovery evaluation tests performed on samples of each of the heat insulating sheets according to examples 1 to 2 and comparative examples 1 to 2, 4 to 6.
Fig. 4 is an exploded perspective view showing a power supply device according to embodiment 2 of the present invention.
Fig. 5 is an exploded perspective view showing a power supply device according to embodiment 3 of the present invention.
Fig. 6 is a perspective view showing a power supply device according to embodiment 4 of the present invention.
Fig. 7A is a perspective view of a power supply device according to embodiment 5 of the present invention, and fig. 7B is a perspective view of a power supply device in which secondary battery cells are placed in a lateral orientation.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are examples for embodying the technical idea of the present invention, and the present invention is not limited to the embodiments described below. In addition, the components shown in the claims are not specified as the components of the embodiments in the present specification. In particular, the dimensions, materials, shapes, relative arrangements of the constituent components described in the embodiments, and the like are not intended to limit the scope of the present invention to these unless otherwise specified, and are merely illustrative examples. In addition, sizes, positional relationships, and the like of components shown in the drawings may be exaggerated in order to clarify the description. In the following description, the same names and symbols denote the same or similar members, and detailed description thereof will be omitted as appropriate. In addition, each element constituting the present invention may be configured by a plurality of elements being the same component, and one component may be used as a plurality of elements, or conversely, the function of one component may be shared by a plurality of components.
[ embodiment 1]
A power supply device according to embodiment 1 is shown in an exploded perspective view in fig. 1. The power supply device 100 shown in the figure includes: a plurality of secondary battery cells 20, and a heat insulating sheet 10 interposed between the secondary battery cells 20. In the secondary battery cell 20, the outer can 21 is formed in a bottomed cylindrical shape, and a plurality of secondary battery cells 20 are stacked with their main surfaces facing each other. For the lamination, for example, both end faces of a battery laminate 25 obtained by laminating the secondary battery cells 20 are covered with end face plates 30, and the end face plates 30 are fastened to each other with fastening members. The cell stack 25 is fixed to the base plate 40 as necessary. The base plate 40 can be made to function as a cooling plate by circulating a refrigerant therein, for example.
In each secondary battery cell 20, an electrode body is housed inside an outer can 21, and the opening end is sealed with a sealing plate 22. In fig. 1, a sealing plate 22 positioned on the upper surface of an outer can 21 is provided with a pair of electrodes 23 and an explosion-proof valve 24. The plurality of secondary battery cells 20 are electrically connected to each other in series and/or in parallel by connecting the electrodes 23 to each other by bus bars. Further, the explosion-proof valve 24 is: and a means for opening by detecting an increase in the internal pressure of the outer tank 21 and for discharging the high-pressure gas inside the outer tank 21. Each explosion-proof valve 24 is connected to an air passage for guiding high-pressure gas to the outside as required.
(Heat insulation sheet 10)
The heat insulating sheet 10 is interposed between the adjacent secondary battery cells 20. The heat insulating sheet 10 is called a separator, or the like, and insulates between adjacent secondary battery cells 20 so that the exterior can 21 does not short-circuit. The insulating sheet having insulating properties is made of a rubber composition.
The compression elastic modulus of the insulating sheet is 4000kPa to 10000 kPa. According to this constitution, there are the following advantages: even when the secondary battery cells 20 are thermally expanded or contracted, the heat insulating sheet 10 having a high compressive modulus of elasticity is interposed between the secondary battery cells 20, and therefore, the heat insulating sheet exhibits a property of following deformation and easily returns to its original shape.
The heat insulating sheet 10 preferably has heat resistance. Even when the secondary battery cell 20 is at a high temperature, the heat insulating performance can be maintained by using a material that is deformed and not easily melted. The heat insulating sheet 10 preferably has a melting temperature of 400 ℃. More preferably 600 ℃ or higher.
In addition, the film thickness of the heat insulating sheet 10 is preferably reduced. The heat insulating performance is improved by the increase in thickness of the film, but the power supply device is increased in size by the increase in thickness of the film. In particular, in a power supply device in which a plurality of secondary battery cells are stacked, the number of separator layers increases in accordance with the number of secondary battery cells, and therefore, the heat insulating sheet is required to be thin. Further, if the heat insulating sheet is made thick, the weight also becomes heavy, and therefore, in the vehicle-mounted application where fuel economy is important, the demand for weight reduction is high, and from this point of view, thinning is required. On the other hand, it is also necessary to maintain the heat insulating performance. In the heat insulating sheet 10 according to embodiment 1, the film thickness is set to 0.1mm to 1.9mm in consideration of the above-described properties and heat insulating performance of the material.
By suppressing the thermal conductivity of the heat insulating sheet 10 to a low level, even if the secondary battery cell 20 in close contact with one surface of the heat insulating sheet 10 is thermally runaway, heat generation is suppressed from affecting the secondary battery cell 20 located on the opposite surface. The thermal conductivity of the heat insulating sheet 10 is preferably set to 0.03 to 0.30W/mK. More preferably, the thermal conductivity is 0.05 to 0.25W/mK.
Further, it is preferable to stabilize it so that the thermal conductivity does not change depending on the ambient environment. Since a conventional heat insulating sheet made of inorganic powder, a polyamide resin, an acrylic ester or other chemical product has hygroscopicity, there is a problem that the heat conductivity is changed due to a large amount of moisture contained in the heat insulating sheet under a high-temperature and high-humidity environment or due to dew condensation or the like. In contrast, according to the heat insulating sheet of embodiment 1, the change in thermal conductivity due to moisture can be suppressed by using a material having low hygroscopicity. Specifically, it is preferable to suppress the weight change of the heat insulating sheet when immersed in water for 10 minutes to 120 wt% or less. Thus, a highly stable heat insulating sheet for a power supply device having high water repellency and suppressed change in thermal conductivity due to moisture absorption can be obtained.
In order to satisfy the above characteristics, the heat insulating sheet 10 includes a fibrous base material, a filler, and a binder. Preferably, natural pulp and inorganic fiber can be used as the fiber base material, silicate mineral can be used as the filler, and a rubber composition can be used as the binder. Specifically, the heat insulating sheet 10 according to embodiment 1 includes: hemp pulp and microglass as fiber base materials, talc and sepiolite as filler materials, and NBR as binder material.
The fibrous base material (also referred to as base material fiber) can utilize: inorganic fibers such as glass fibers, carbon fibers, and ceramic fibers; or organic fibers such as aromatic polyamide fibers and polyethylene fibers. Here, natural pulp of organic fibers is used as the fiber base material. The natural pulp may preferably be hemp pulp.
The blending ratio of the hemp pulp is, for example, 5 to 20% by weight, preferably 10% by weight. The fibrous base material may contain inorganic fibers. The blending ratio of the inorganic fiber is 5 to 20 wt%, preferably 8 to 15 wt%. In embodiment 1, 12 wt% of a fine glass is added as an inorganic fiber.
The filler may be an inorganic filler. Examples of the inorganic filler include: silicate minerals such as sepiolite, talc, kaolin, mica, and sericite; magnesium carbonate, calcium carbonate, hard clay, calcined clay, synthetic silica such as barium sulfate, calcium silicate, wollastonite, sodium hydrogen carbonate, white carbon silica, fused silica and the like, natural silica such as diatomaceous earth and the like, aluminum hydroxide, magnesium hydroxide, glass beads and the like, and these may be used alone or in combination of plural kinds. The addition of these inorganic fillers exhibits the effects of maintaining the shape and improving the heat insulating properties in a high-temperature atmosphere. In embodiment 1, talc having high flexibility is used. The amount of the filler is preferably 5 to 65 wt% in the insulating sheet. In embodiment 1, magnesium silicate is used as a filler, and 58 wt% of talc and 14 wt% of sepiolite are added.
As the adhesive material, in addition to using synthetic resins such as vinyl chloride resin, vinylidene chloride resin, acrylic resin, urethane resin, vinyl acetate resin, polyethylene resin, polystyrene resin, acryl butadiene styrene resin, acrylonitrile styrene resin, fluorine resin, silicone resin, epoxy resin, phenol resin, etc., there can be used: acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, acrylic rubber, acrylonitrile rubber, ethylene propylene rubber, styrene butadiene rubber, chloroprene rubber, butadiene rubber, butyl rubber, fluorine rubber, silicone rubber, fluorinated silicone rubber, chlorosulfonated rubber, ethylene vinyl acetate rubber, chlorinated polyethylene, chlorinated butyl rubber, epichlorohydrin rubber, nitrile isoprene rubber, natural rubber, isoprene rubber, and the like. Among them, acrylonitrile butadiene rubber (NBR) is preferable in that it has high water resistance and oil resistance. These rubbers may be used in combination of 1 kind or 2 or more kinds. Further, for the purpose of high water resistance and oil resistance, a sizing agent such as an alkylketene dimer or a fluorine-based or silicon-based water repellent agent may be used in combination. When the rubber composition is used as the binder, the amount of the rubber is preferably 5.0 to 40% by weight in the insulating sheet. Here, Nipole 1562 as NBR was added in an amount of 6.0 wt%.
In addition, as additives, paper strength agents, color fixing agents, defoaming agents and other chemical products are added. Here, 0.5 wt% WS4030 was added as a paper strength agent, 0.3 wt% Cogam 15H was added as a paper strength agent, 1.9 wt% aluminum sulfate was added as a color fixing agent, and an appropriate amount of KM-70 was added as a defoaming agent.
(method for producing Heat-insulating sheet)
As a method for producing the heat insulating sheet, for example, a composition for forming a heat insulating sheet is prepared by kneading a binder and a filler into a base fiber, and the composition is heated, rolled, and vulcanized between a pair of rolls including a hot roll and a cold roll, and the composition is laminated on the hot roll side, and then the laminated sheet is peeled off, whereby the heat insulating sheet can be produced. Alternatively, the heat insulating sheet may be produced by a papermaking method. In this case, the base fibers and the filler as raw materials are put into the pulper and mixed in water. Next, these mixed raw material slurries are transported to a vessel, and a binder and chemicals are added. Further, the mixed raw material slurry added with the chemical is fluidized in the wire (web) step to be formed into a sheet, and is subjected to wringing and thickness adjustment in the pressing step. And finally, drying the coiled material by using a rotary drum dryer to obtain the coiled material. The coil thus obtained is cut to product size in a further process step. Rubber such as NBR can be added to the sheet by impregnation or internal addition.
The properties of the heat insulating sheet 10 according to embodiment 1 thus obtained are as follows: the gram weight is 554g/cm30.699mm in thickness and 0.793g/cm in density35.7kgf/15mm tensile strength, 22.7 wt% loss by heat and strength, and 0.19W/mK thermal conductivity.
(Water absorption evaluation test results)
An evaluation test was performed to compare the water absorption of the heat insulating sheet 10 obtained as described above with that of a conventional heat insulating sheet. Here, a heat insulating sheet having a thickness of 0.3mm was produced as example 1, and a heat insulating sheet having a thickness of 0.7mm was produced as example 2. In addition, as comparative examples, a separator having a film thickness of 0.25mm manufactured by TIGEREX corporation was used as comparative example 1, a separator having a film thickness of 0.5mm was used as comparative example 2, and a separator having a film thickness of 1.2mm was used as comparative example 3. Similarly, a separator having a thickness of 1.2mm from Promat Japan was used as comparative example 4, a separator having a thickness of 2.2mm was used as comparative example 5, and a separator having a thickness of 3.0mm was used as comparative example 6. The weight (air-dried weight) of each sample cut into 5cm square was measured for each of these heat insulating sheets. Next, each sample was dried in a 135 ℃ dryer for 1 hour. Then, the mixture was placed in a desiccator, allowed to cool for 30 minutes, and the weight (oven-dried weight) was measured. Further, each sample was immersed in water for 10 minutes, and then excess water was removed with a water absorbent paper to measure the weight (weight after water immersion). The results are shown in the graph of fig. 2. As shown in the figure, examples 1 and 2 were judged to be less likely to absorb moisture and water than comparative examples 1 to 6. Thus, it is believed that: the change in heat insulating properties, i.e., thermal conductivity, due to moisture, which is an external factor, is smaller than in comparative examples 1 to 6. From this it can be considered that: for example, when the heat insulating sheet is interposed between the lithium ion secondary battery cells 20 and used as a separator for preventing burn-up during thermal runaway, it is possible to effectively prevent the separator from absorbing moisture generated in the power supply device due to the use environment such as temperature and humidity or due to condensation caused by water cooling, and thus it is possible to stably maintain a desired thermal conductivity regardless of the surrounding environment, and to improve reliability.
(evaluation test for compression and recovery)
Next, evaluation tests of the compression and recovery properties of the heat insulating sheet were performed. The heat insulating sheets of examples 1 to 2 and comparative examples 1 to 2 and 4 to 6 were also used here. The thickness (thickness before pressing) of each sample cut into 10cm square was measured for each of these heat insulating sheets. Then, each sample was pressed at 30, 75, 150[ kgF/cm ] using a press2]The pressure of (2) was applied for 60 seconds, and the thickness immediately after the application of pressure (thickness immediately after pressing) was measured. Further, the sheet was left in a constant temperature and humidity chamber at 23 ℃ and 50% for 2 hours or more, and then the thickness (thickness after pressing) was measured. The results are shown in the graph of fig. 3. As shown in the figure, in examples 1 and 2, although the collapse by pressing was large as compared with comparative examples 1 to 2 and 4 to 6, recovery of about 2% was observed after compression. On the other hand, the heat insulating sheets of comparative examples 1 to 2 and 4 to 6 were hard and hardly collapsed, but the recovery after compression was only 1% or less, and it was judged that there was almost no recovery. In this manner, in comparative examples 1 to 2 and 4 to 6, although the rigidity was high, the state was not returned to the original state when the deformation and collapse were once occurred. For example, when the heat insulating sheet is used as a separator of a single cell of a lithium ion secondary battery, the lithium ion secondary battery usually repeats expansion and contraction during use, and at this time, the heat insulating sheet is used as a separator of a single cell of the lithium ion secondary batteryIf the heat insulating sheet collapses due to expansion, the heat insulating sheet does not recover even if the lithium ion secondary battery contracts thereafter, and as a result, the heat insulating sheet does not adhere to each other between the lithium ion secondary batteries, a gap is generated, and the stacked state cannot be properly maintained. In contrast, the heat insulating sheets according to examples 1 and 2 can achieve a recovery of about 2 times as much as the comparative examples, and therefore, even in the process of expansion and contraction of the lithium ion secondary battery, the heat insulating sheets can follow the deformation of the outer can, and can be used as a more stable and highly reliable separator.
As described above, the heat insulating sheet according to the embodiment of the present invention has an advantage that it can be stably used with high reliability. In particular, in applications where the separator is used as a separator for a secondary battery cell, the surface of a plate material may be rubbed by expansion and contraction of the secondary battery cell, and fine powder may be peeled off. In particular, in the case of vehicle-mounted applications, since repeated vibration or impact is applied to the power supply device, the generation of paper dust and the like cannot be avoided in a plate material having a structure in which the inorganic powder content is increased and the binder is reduced. Further, although a sheet material using a nano silica aerosol has been proposed, it is expensive and also paper dust is inevitably generated. Therefore, a surface treatment such that paper dust is not easily generated, such as a surface lamination process, is required, the manufacturing process is complicated, and the cost is increased. Further, although paper dust is not easily generated by surface treatment such as lamination processing or bagging processing of the surface, there is a possibility that damage may occur due to vibration or impact applied to the power supply device. In contrast, the heat insulating sheet according to embodiment 1 has an advantage that generation of paper dust can be suppressed without the surface treatment by using the rubber composition. Further, although the conventional separator is similarly accompanied by paper dust even when punching or the like is performed, the heat insulating sheet 10 according to embodiment 1 can similarly suppress such paper dust, and therefore, has high workability and can be applied as a member having excellent process adaptability.
Further, the conventional separator using a plate material has a problem that, since it has hygroscopicity, the thermal conductivity changes depending on the environment by absorbing moisture. In order to stably exhibit the heat insulating property of the separator, it is necessary to suppress the change in the thermal conductivity depending on the environment, and the conventional separator cannot avoid the change in the thermal conductivity due to the absorption of moisture generated in a high-temperature and high-humidity environment or due to dew condensation or the like. A sheet using a resin material such as an acrylic resin has high moisture absorption, and therefore, the heat insulation performance may be lowered by the environment. In contrast, the heat insulating sheet 10 according to embodiment 1 can exhibit hydrophobicity by using a rubber composition. In addition, the water resistance is also excellent, moisture absorption can be suppressed, and a change in thermal conductivity due to the moisture content can be reduced, and the water-resistant heat-insulating material can be stably used without depending on the surrounding environment.
[ embodiment 2]
In the above, an example in which the heat-resistant sheet is used as a separator between the unit cells of the lithium ion secondary battery has been described. However, the present invention is not limited to the use of the heat insulating sheet for the heat insulating separator of the battery, and may be used for other uses. The present invention can be suitably used for applications requiring reliability by utilizing the characteristics of heat resistance and small change in thermal conductivity. Further, since the compression modulus of elasticity is low, it can be suitably used for applications requiring deformation. For example, the present invention can also be used for cushioning between an explosion-proof valve and a gas duct of a secondary battery cell, protective heat insulating material for a circuit board, heat insulating material between modules, and the like. As an example, an example in which a heat insulating sheet is used as a cushion material between an explosion-proof valve of a secondary battery cell and a gas duct is shown in an exploded perspective view of fig. 4 as a power supply device according to embodiment 2. In the power supply device 200 shown in the figure, the gas duct 50 is provided on the upper surface of the battery stack 25 obtained by stacking a plurality of secondary battery cells 20. The gas duct 50 communicates with the explosion-proof valve 24 included in each secondary battery cell 20. In order to air-tightly connect each explosion-proof valve 24 and the air passage 50, the cushion sheet 12 is interposed therebetween. As the buffer sheet 12, the heat insulating sheet according to the embodiment is applied. In fig. 4, the same components as those described in embodiment 1 above are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate. The heat insulating sheet functioning as the cushion sheet 12 is connected to the explosion-proof valves 24 and the connecting holes of the air passages 50. Thermal spacers may be used to make them gas-tight so that high pressure gas does not leak between the explosion-proof valve 24 and the gas duct 50 during thermal runaway. In particular, the heat insulating sheet according to the embodiment can be appropriately deformed by a high compression elastic modulus. In addition, the gas guide device has high heat resistance capable of withstanding high-temperature and high-pressure gas, and can be used in this application, and in the event of thermal runaway, the gas guide device can stably guide high-pressure gas to the gas duct 50 and discharge the gas to the outside of the power supply device, thereby improving safety.
In addition, the power supply device 300 according to embodiment 3 shown in fig. 5 illustrates an example in which a heat insulating sheet is used as a protective and heat insulating material for a circuit board. In the power supply device 300 shown in the figure, a circuit board 60 is provided on the upper surface of a battery laminate 25 obtained by laminating a plurality of secondary battery cells 20. The heat insulating sheet 10 is interposed between the circuit board 60 and the circuit board 60 to protect the circuit board 60 from the scattering of high-temperature gas or electrolyte released from the explosion-proof valve 24 formed in the sealing plate of each secondary battery cell 20. Accordingly, the circuit board 60 is protected from the high-temperature and high-pressure gas.
The heat insulating sheet is used not only for heat insulation between the secondary battery cells but also for heat insulation between battery modules each including a plurality of secondary battery cells. Fig. 6 shows this example as a power supply device according to embodiment 4. In the power supply device 400 shown in the figure, a battery module is configured by a battery stack 25 in which a plurality of secondary battery cells 20 are stacked. By providing the heat insulating material 10X between these battery modules, heat transfer between adjacent battery modules can be suppressed.
In the above example, an example of using the heat insulating material for the secondary battery cell using the rectangular outer can as the secondary battery cell is described. However, the present invention is not limited to the rectangular outer shape of the secondary battery cell, and may be applied to a secondary battery cell having another shape such as a cylindrical shape or a pouch shape. As an example, fig. 7A shows an example of application to a cylindrical secondary battery cell as a power supply device according to embodiment 5. In the power supply device 500A shown in the figure, the heat insulating sheet 10 is interposed between the adjacent secondary battery cells in a state where the plurality of cylindrical secondary battery cells 20B are arranged in parallel. Thus, heat transfer can be suppressed by the heat insulating sheet 10 regardless of which secondary battery cell 20B is at a high temperature. In this example, one heat insulating sheet 10A is notched from one end, and the other heat insulating sheet 10B is notched from the other end, and these notches are combined with each other so that the heat insulating sheets intersect with each other to separate the secondary battery cells 20B. In the example of fig. 7A, the secondary battery cell 20B is placed in the vertical direction, but it is needless to say that the secondary battery cell may be placed in the horizontal direction as shown in fig. 7B.
Industrial applicability
The heat insulating sheet for a power supply device and the power supply device of the present invention can be preferably applied to: a heat insulating spacer interposed between the single cells of the secondary battery, a cushion sheet interposed between the explosion-proof valve and the air duct, or a heat insulating material for protecting a drive circuit such as an ECU.
Description of the symbols
100. 200, 300, 400, 500A, 500B … power supply unit
10. 10X, 10A, 10B … heat insulation sheet
12 … buffer sheet
20. 20B … secondary battery cell
21 … external can
22 … sealing board
23 … electrode
24 … explosion-proof valve
25 … Battery laminate
30 … end panel
40 … base plate
50 … air flue
60 … Circuit Board
Claims (15)
1. A heat insulating sheet for a power supply device for insulating a plurality of secondary battery cells stacked so as to be connected in series and/or in parallel with each other,
is composed of a rubber composition having an insulating property,
the compression elastic modulus is 4000 to 10000 kPa.
2. The heat-insulating sheet for a power supply device according to claim 1,
the weight change of the heat insulating sheet when immersed in water for 10 minutes is 120 wt% or less.
3. The heat insulating sheet for a power supply device according to claim 1 or 2,
the thermal conductivity of the heat insulation sheet is 0.03-0.30W/mK.
4. The heat insulating sheet for a power supply device according to any one of claims 1 to 3,
the water absorption of the heat insulation sheet is 120% or less.
5. The heat insulating sheet for a power supply device according to any one of claims 1 to 4,
the heat-resistant temperature of the heat-insulating sheet is above 400 ℃.
6. The heat insulating sheet for a power supply device according to any one of claims 1 to 5,
the film thickness of the heat insulation sheet is 0.1 mm-1.9 mm.
7. The heat insulating sheet for a power supply device according to any one of claims 1 to 6,
the heat insulating sheet includes: a fibrous base material, a filler material, and a binder material.
8. The heat-insulating sheet for a power supply device according to claim 7,
the heat insulating sheet includes: natural pulp and inorganic fibers as the fiber base material, silicate mineral as the filler, and a rubber composition as the binder.
9. The heat insulating sheet for a power supply device according to any one of claims 1 to 8,
the compression recovery rate of the heat insulation sheet is 1.0-5.0%.
10. The heat insulating sheet for a power supply device according to any one of claims 1 to 9,
the heat insulating sheet for a power supply device is interposed between adjacent ones of the plurality of secondary battery cells.
11. The heat insulating sheet for a power supply device according to any one of claims 1 to 9,
the heat insulating sheet for a power supply device is used as a buffer sheet between an explosion-proof valve that is opened when an increase in the internal pressure of an outer can of the secondary battery cell is detected and an air duct for guiding high-temperature and high-pressure gas discharged from the explosion-proof valve to the outside, in any one of the plurality of secondary battery cells.
12. The heat insulating sheet for a power supply device according to any one of claims 1 to 9,
the heat insulating sheet for a power supply device is used as a heat insulating material for any one of the plurality of secondary battery cells, and is interposed between the explosion-proof valve and the circuit board to prevent high-pressure high-temperature gas or electrolyte discharged from the explosion-proof valve that is opened when the increase in the internal pressure of the outer can of the secondary battery cell is detected from scattering to the inner cover or the circuit board.
13. The heat insulating sheet for a power supply device according to any one of claims 1 to 9,
the heat insulating sheet for a power supply device is used as a heat insulating material that is interposed between cell laminate modules obtained by laminating the plurality of secondary battery cells so as to prevent heat transfer between adjacent modules.
14. A power supply device is provided with:
a plurality of secondary battery cells stacked so as to be connected in series and/or in parallel with each other; and
an insulating heat insulating sheet interposed between adjacent secondary battery cells,
the power supply device is characterized in that,
the heat-insulating sheet is made of a rubber composition,
the heat-resistant temperature is above 400 ℃.
15. A power supply device is characterized by comprising:
a plurality of secondary battery cells stacked so as to be connected in series and/or in parallel with each other;
a gas duct connected to an explosion-proof valve provided in each of the plurality of secondary battery cells and opened when an increase in internal pressure of an outer can of the secondary battery cell is detected, the gas duct being configured to guide high-pressure gas discharged from the explosion-proof valve to the outside; and
a heat insulating sheet interposed between the gas duct and the explosion-proof valve of each secondary battery cell and hermetically connecting the gas duct and the explosion-proof valve,
the heat-insulating sheet is made of a rubber composition,
the heat-resistant temperature is above 400 ℃.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-240361 | 2018-12-21 | ||
| JP2018240361 | 2018-12-21 | ||
| PCT/JP2019/017671 WO2020129274A1 (en) | 2018-12-21 | 2019-04-25 | Power source device and thermal insulation sheet for power source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113228382A true CN113228382A (en) | 2021-08-06 |
Family
ID=71100753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980083420.1A Pending CN113228382A (en) | 2018-12-21 | 2019-04-25 | Power supply device and heat insulating sheet for power supply device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7351854B2 (en) |
| KR (1) | KR20210106994A (en) |
| CN (1) | CN113228382A (en) |
| WO (1) | WO2020129274A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114709462A (en) * | 2022-04-11 | 2022-07-05 | 江苏正力新能电池技术有限公司 | Battery module |
| CN115498339A (en) * | 2022-08-18 | 2022-12-20 | 惠州市纬世新能源有限公司 | Battery safety supporting structure of energy storage power supply |
| WO2023206828A1 (en) * | 2022-04-28 | 2023-11-02 | 上海兰钧新能源科技有限公司 | Battery box body structure, battery cell and battery pack |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2023032742A1 (en) * | 2021-08-31 | 2023-03-09 | 日本ゼオン株式会社 | Battery module sheet and battery module |
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Also Published As
| Publication number | Publication date |
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| WO2020129274A1 (en) | 2020-06-25 |
| KR20210106994A (en) | 2021-08-31 |
| JPWO2020129274A1 (en) | 2021-11-04 |
| JP7351854B2 (en) | 2023-09-27 |
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