WO2015029505A1 - 安全装置付き電気化学デバイス及び電気化学デバイス用安全装置 - Google Patents
安全装置付き電気化学デバイス及び電気化学デバイス用安全装置 Download PDFInfo
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- WO2015029505A1 WO2015029505A1 PCT/JP2014/062947 JP2014062947W WO2015029505A1 WO 2015029505 A1 WO2015029505 A1 WO 2015029505A1 JP 2014062947 W JP2014062947 W JP 2014062947W WO 2015029505 A1 WO2015029505 A1 WO 2015029505A1
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- case
- movable plate
- film
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/08—Housing; Encapsulation
- H01G9/12—Vents or other means allowing expansion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
- H01G11/20—Reformation or processes for removal of impurities, e.g. scavenging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
-
- 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
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- 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
Definitions
- the present invention is a battery and capacitor used for mobile devices such as smartphones and tablets, hybrid vehicles, electric vehicles, wind power generation, solar power generation, batteries and capacitors used for power storage for night electricity, etc.
- the present invention relates to an electrochemical device with an apparatus and a safety device used for such an electrochemical device.
- aluminum is used to include aluminum and its alloys.
- the outer packaging material of lithium ion batteries and lithium polymer batteries mounted on them is made of an aluminum foil having a thickness of about 20 to 100 ⁇ m instead of a conventional metal can.
- a laminate exterior material in which plastic films are bonded to both sides is used to reduce the weight.
- packaging of a power source for an electric vehicle or the like, a large-scale power source for power storage, a capacitor, or the like with the laminate exterior material having the above-described configuration has been studied.
- an explosion-proof valve In general, in lithium-ion batteries that use metal cans as exterior materials, an explosion-proof valve is installed that releases gas to the outside of the battery under a certain pressure when gas accumulates inside the battery due to overcharging, short-circuiting, etc., and the internal pressure increases. Explosion-proof measures are taken.
- Patent Document 1 includes a unit cell including a sheet-like positive electrode, a sheet-like negative electrode, a positive electrode lead, and a negative electrode lead, and the positive electrode lead and the negative electrode lead are formed using a heat-sealing seal film.
- the sheet-type battery having a structure obtained by coating the tip of the film so as to protrude to the outside and bonding the film by heat fusion, an opening formed in the film when the unit cell is covered (however, At least one end is sealed by attaching another film material (sealing film), and the remaining opening is sealed by heat fusion.
- a sealed battery with a sealed configuration is described. In this sheet type battery, when the internal pressure is increased, gas can be released to the outside from the sealing film attaching portion having a low sealing strength.
- Patent Document 2 discloses an electrochemical device having a laminate film containing a metal foil in an exterior body, and an electrochemical device element body enclosed in the exterior body, and a part of an adhesive portion of the exterior body
- the electrochemical device which has the protrusion part which protrudes in the electrochemical device storage space side is described.
- the pressure due to gas generation concentrates on the protruding portion protruding toward the electrochemical device storage space, so that the portion can be destroyed and the gas can escape to the outside.
- Patent Document 2 has a problem in that the internal pressure at which the protruding portion is destroyed tends to vary because it is difficult to control the sealing strength at the protruding portion.
- the present invention has been made in view of such a technical background, and is capable of ensuring sufficient sealing performance in a case in which an electrochemical device main body is enclosed, and when the internal pressure of the case rises due to generation of gas, It is an object of the present invention to provide an electrochemical device with a safety device and a safety device for an electrochemical device that can prevent the case from being ruptured due to an increase in internal pressure.
- the present invention provides the following means.
- a base plate is disposed between at least one side wall of the case and the main body, and a part of the lower side of the base plate is joined to the inner surface of the case, Between the at least one side wall of the case and the base plate, a movable plate having a perforation protrusion on the upper side is disposed, A guide film is disposed between the lower wall of the case and the lower surface of the main body, and a part of the guide film is joined to at least a part of the inner surface of the lower wall of the case, so that a third joint portion is formed.
- the guide film is inserted between the main body portion and the base plate and extends upward, and is further inserted between the upper end of the base plate and the upper wall of the case and folded downward and further downward.
- a part of the extended portion is extended and inserted between the base plate and the movable plate, and the lower portion is joined to the movable plate to form a fourth joint,
- the third joint portion of the guide film moves downward in conjunction with the downward movement of the lower wall of the case due to the expansion and deformation.
- the movable plate according to any one of items 1 to 4, wherein the movable plate is made of at least one material selected from the group consisting of a resin plate, a ceramic plate, a glass plate, and a resin-coated metal plate. Electrochemical device with safety device.
- the case is an exterior material including a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and an aluminum foil layer disposed between the two film layers. 6.
- the electrochemical device with a safety device according to any one of items 1 to 5, which is formed.
- a safety device for an electrochemical device in which an electrochemical device body is enclosed in a case, A movable plate disposed between the case and the main body and provided with a perforation protrusion; When the case expands and deforms due to an increase in internal pressure due to the generated gas in the case, the perforation protrusion of the movable plate is moved toward the case in conjunction with the expansion and deformation.
- a safety device for electrochemical devices When the case expands and deforms due to an increase in internal pressure due to the generated gas in the case, the perforation protrusion of the movable plate is moved toward the case in conjunction with the expansion and deformation.
- a safety device for an electrochemical device in which an electrochemical device body is enclosed in a case, A movable plate disposed between at least one side wall of the case and the main body, and provided with a perforation protrusion on the upper side; An induction film disposed between the case and the main body, A part of the induction film is disposed between the upper wall of the case and the upper surface of the main body, and a part of the induction film is joined to at least a part of the inner surface of the upper wall of the case. 1 joint is formed, The guide film is inserted between the main body portion and the movable plate and extended downward, and is further inserted between the lower end of the movable plate and the lower wall of the case and folded upward. And a second joint portion is formed by joining a part of the portion extending upward to the inner surface of the side wall of the case. Safety device for chemical devices.
- a safety device for an electrochemical device in which an electrochemical device body is enclosed in a case A base plate disposed between at least one side wall of the case and the main body; A movable plate disposed between at least one side wall of the case and the base plate, and having a perforation protrusion on an upper side; An induction film disposed between the case and the main body, A part of the lower side of the base plate is joined to the inner surface of the case, A part of the induction film is disposed between the lower wall of the case and the lower surface of the main body, and a part of the induction film is joined to at least a part of the inner surface of the lower wall of the case.
- the guide film is inserted between the main body portion and the base plate and extends upward, and is further inserted between the upper end of the base plate and the upper wall of the case and folded downward and further downward. It is extended and inserted and arranged between the base plate and the movable plate, and a part of the portion extending downward is joined to the movable plate to form a fourth joint portion.
- Safety equipment for electrochemical devices is inserted between the main body portion and the base plate and extends upward, and is further inserted between the upper end of the base plate and the upper wall of the case and folded downward and further downward. It is extended and inserted and arranged between the base plate and the movable plate, and a part of the portion extending downward is joined to the movable plate to form a fourth joint portion.
- Safety equipment for electrochemical devices is inserted between the main body portion and the base plate and extends upward, and is further inserted between the upper end of the base plate and the upper wall of the case and folded downward and further downward. It is extended and inserted and arranged between the
- the movable plate according to any one of items 8 to 11, wherein the movable plate is made of at least one material selected from the group consisting of a resin plate, a ceramic plate, a glass plate, and a resin-coated metal plate.
- Safety device for electrochemical devices is made of at least one material selected from the group consisting of a resin plate, a ceramic plate, a glass plate, and a resin-coated metal plate.
- the induction film since the resin film having a thickness of 0.01 mm to 0.2 mm is used as the induction film, the induction film is sufficiently interlocked with the case when the case is expanded and deformed due to an increase in internal pressure. Therefore, the certainty of preventing the case from bursting can be improved.
- the movable plate is made of at least one material selected from the group consisting of a resin plate, a ceramic plate, a glass plate, and a resin-coated metal plate, and these materials are non-conductive.
- these materials are also resistant to electrolytes, preventing corrosion degradation, and moving when the amount of expansion and deformation of the case increases due to an increase in internal pressure.
- the perforation protrusion of the possible plate can surely pierce the case from the inside to reliably form the air hole.
- the case includes a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and an aluminum foil layer disposed between these two film layers. Since it is the structure formed with the exterior material, while being able to fully provide the gas-barrier property which prevents the penetration
- the movable plate when the case is inflated and deformed due to an increase in internal pressure due to a gas generated in the case, the movable plate is provided between the case and the main body and provided with a perforation protrusion. Since the perforation protrusions of the movable plate move toward the case in conjunction with the deformation, the perforation protrusions of the movable plate move inside the case when the amount of expansion deformation of the case increases. Since the gas in the case escapes to the outside through the air hole, the case can be prevented from being ruptured due to an increase in internal pressure. On the other hand, when the internal pressure does not increase in the case, the case does not expand and deform, so that the perforation protrusion of the movable plate does not move toward the case, and sufficiently secures the confidentiality in the case. be able to.
- the perforation protrusion of the movable plate breaks through the upper wall of the case from the inside to form a vent hole, and the gas in the case Since it goes outside through the vent hole, the case can be prevented from being ruptured due to an increase in internal pressure.
- the case does not expand and deform, so that the perforation protrusion of the movable plate does not move toward the case, and sufficiently secures the confidentiality in the case. be able to.
- the case can be prevented from rupture due to an increase in internal pressure.
- the case does not expand and deform, so that the perforation protrusion of the movable plate does not move toward the case, and sufficiently secures the confidentiality in the case. be able to.
- the induction film since the resin film having a thickness of 0.01 mm to 0.2 mm is used as the induction film, the induction film is sufficiently interlocked with the case when the case is expanded and deformed due to an increase in internal pressure. Therefore, the certainty of preventing the case from bursting can be improved.
- the movable plate is made of at least one material selected from the group consisting of a resin plate, a ceramic plate, a glass plate, and a resin-coated metal plate, and these materials are non-conductive.
- these materials are also resistant to electrolytes, preventing corrosion degradation, and moving when the amount of expansion and deformation of the case increases due to an increase in internal pressure.
- the perforation protrusion of the possible plate can surely pierce the case from the inside to reliably form the air hole.
- FIG. 2 is a side view showing the electrochemical device of FIG. 1 with a part of the case side wall on the side where a movable plate is arranged cut away.
- FIG. 6 is a cross-sectional view showing a state in which a case is expanded and deformed by an increase in internal pressure due to generated gas in the electrochemical device with a safety device of FIG.
- the internal pressure in the case further increases, so that the amount of expansion deformation of the case increases, and the perforation protrusion of the movable plate breaks through the case from the inside to form a vent hole.
- FIG. 6 is a side view showing the electrochemical device of FIG. 5 with a part of the case side wall on the side where the movable plate is arranged cut away.
- FIG. 5 shows the electrochemical device of FIG. 5 in the state in the middle of manufacture, Comprising: The state which has arrange
- FIG. 6 is a cross-sectional view showing a bonding mode of a fourth bonding portion in the electrochemical devices of Examples 1 to 4.
- FIG. 1 shows an embodiment of an electrochemical device 1 with a safety device according to the present invention.
- the electrochemical device 1 includes an electrochemical device body 3 enclosed in a case 2 having a substantially rectangular parallelepiped shape.
- the electrochemical device main body 3 is disposed between the two exterior members 70, and the peripheral portions 70 a of the two exterior members 70 are sealed and bonded together by heat sealing in the inner layers 75 of each other.
- the case 2 is formed, and the electrochemical device main body 3 is enclosed in the case 2.
- one exterior material (upper exterior material) 70 is formed into a three-dimensional shape (substantially box shape with the lower surface opened) by molding such as deep drawing molding or overhang molding. The configuration and the like of the exterior material 70 will be described in detail later.
- a positive electrode tab and a negative electrode tab are led out from the case 2 from the electrochemical device body 3.
- a movable plate 4 is arranged between one side wall 21 of the case 2 and one side surface 31 of the main body 3 (gap).
- the movable plate 4 is disposed substantially parallel to the one side wall 21 of the case 2.
- the movable plate 4 has a plurality of perforation projections 5 protruding upward from the upper end edge of the substrate 11 having a substantially rectangular shape in side view.
- the perforation projection 5 is formed in a shape that decreases in diameter toward the tip (upper end) and is formed in a shape in which the tip (upper end) is pointed (see FIGS. 1 and 4).
- the induction film 6 is arranged between the upper wall 22 of the case 2 and the upper surface 32 of the main body 3 (gap). Further, a part of the induction film 6 is joined to the central portion of the inner surface (inner layer 75) of the upper wall 22 of the case 2 to form a first joint portion 41.
- the guide film 6 is inserted between the side surface 31 of the main body 3 and the movable plate 4 (gap) and extended downward, and further, the lower end 4b of the movable plate 4 and the case 2 are arranged. It is inserted between the lower walls 23 (gap), is folded upward and is further extended upward, and a part of the upwardly extending part 6A (part on the upper side) is
- the second joining portion 42 is formed by joining to the inner surface (inner layer 75) of the one side wall 21 of the case 2.
- the safety device 10 is configured by the movable plate 4 having the above configuration and the guide film 6 having the above configuration.
- the perforation protrusion 5 of the movable plate 4 breaks through the case 2 from the inside to form the vent hole 50.
- the internal gas escapes to the outside through the vent hole 50, so that the rupture of the case 2 due to an increase in internal pressure can be prevented.
- the electrochemical device 1 with a safety device shown in FIG. 1 it is used in an arrangement mode in which the lower wall 23 of the case 2 is on the lower side and the upper wall 22 is on the upper side (see FIG. 1).
- an upside down arrangement mode an arrangement mode in which the upper wall 22 is on the lower side and the lower wall 23 is on the upper side
- the movable plate 4 falls downward due to its own weight, and the perforation projection 5 is always on the inner surface of the case 2.
- Such an arrangement cannot be adopted because of contact.
- the electrochemical device 1 includes an electrochemical device body 3 enclosed in a case 2 having a substantially rectangular parallelepiped shape.
- the electrochemical device main body 3 is disposed between the two exterior members 70, and the peripheral portions 70 a of the two exterior members 70 are sealed and bonded together by heat sealing in the inner layers 75 of each other.
- the case 2 is formed, and the electrochemical device main body 3 is enclosed in the case 2.
- one exterior material (lower exterior material) 70 is formed into a three-dimensional shape (substantially box shape with an open top surface) by molding such as deep drawing molding or overhang molding. The configuration and the like of the exterior material 70 will be described in detail later.
- a positive electrode tab and a negative electrode tab are led out from the case 2 from the electrochemical device body 3.
- a base plate 7 is disposed between one side wall 21 of the case 2 and one side surface 31 of the main body 3 (gap).
- the base plate 7 is disposed substantially parallel to the side surface 31 of the main body 3.
- the base plate 7 has a substantially rectangular shape in a side view.
- a lower end portion of the base plate 7 is joined to the inner surface (inner layer 75) of the case 2 by welding to form a fifth joint portion 45.
- the lower end portion of the base plate 7 is joined to the inner surface (inner layer 75) of the lower end portion of the side wall 21 of the case 2 by welding.
- a gap is provided between the upper end 7 a of the base plate 7 and the upper wall 22 of the case 2.
- a movable plate 4 is disposed between one side wall 21 of the case 2 and the base plate 7 (gap).
- the movable plate 4 is disposed substantially parallel to the one side 31 of the main body 3. That is, the movable plate 4 is arranged substantially parallel to the base plate 7.
- the movable plate 4 has a plurality of perforation projections 5 protruding upward from the upper end edge of the substrate 11 having a substantially rectangular shape when viewed from the side.
- the perforation protrusion 5 is formed in a shape that is reduced in diameter toward the tip (upper end), and is formed in a shape in which the tip (upper end) is pointed (see FIGS. 5 and 8).
- the induction film 6 is disposed between the lower wall 23 of the case 2 and the lower surface 33 of the main body 3 (gap). Further, a part of the induction film 6 is joined to the central portion of the inner surface (inner layer 75) of the lower wall 23 of the case 2 to form a third joint 43.
- the guide film 6 is inserted between the side surface 31 of the main body 3 and the base plate 7 (gap) and extended upward, and the upper end 7a of the base plate 7 and the upper wall of the case 2 are extended. 22 is inserted between the base plate 7 and the movable plate 4 (gap), and is extended downward. A part of the portion 6B (a part on the lower side) is joined to the movable plate 4 to form a fourth joint 44.
- the safety device 10 is configured by the base plate 7 having the above configuration, the movable plate 4 having the above configuration, and the guide film 6 having the above configuration.
- the electrochemical device 1 when gas is generated due to overcharge, short circuit, etc., when the case 2 expands and deforms due to an increase in internal pressure due to the generated gas in the case 2, as shown in FIG.
- the third joint 43 of the guide film 6 moves downward (the lower surface of the main body 3) in conjunction with the downward movement of the lower wall 23 of the case 2 (moving downward relative to the lower surface of the main body 3). Move downward).
- the lower end portion of the base plate 7 is joined to the inner surface of the case 2 and a part (fourth joining portion) 44 of the guide film 6 is joined to the movable plate 4.
- the perforation protrusion 5 of the movable plate 4 breaks through the case 2 from the inside to form the vent hole 50.
- the internal gas escapes to the outside through the vent hole 50, so that the rupture of the case 2 due to an increase in internal pressure can be prevented.
- the electrochemical device 1 with a safety device shown in FIG. 5 is used in an arrangement mode in which the lower wall 23 of the case 2 is on the lower side and the upper wall 22 is on the upper side (see FIG. 5).
- an upside down arrangement mode an arrangement mode in which the upper wall 22 is on the lower side and the lower wall 23 is on the upper side
- the movable plate 4 falls downward due to its own weight, and the perforation projection 5 is always on the inner surface of the case 2.
- Such an arrangement cannot be adopted because of contact.
- each of the movable plate 4 and the base plate 7 is at least one selected from the group consisting of a resin plate, a ceramic plate, a glass plate, and a resin-coated metal plate (a metal plate whose surface is coated with a resin).
- these materials are non-conductive, so that sufficient internal insulation can be secured, and since these materials are excellent in electrolyte resistance, they are subject to corrosion deterioration.
- the perforation projection 5 of the movable plate 4 can surely break through the case 2 from the inside to reliably form the air vent 50.
- the resin include olefin resin, polyester resin, polycarbonate resin, and fluorine resin.
- the surface resin used for the resin-coated metal include olefin resins, polyester resins, polycarbonate resins, and fluorine resins.
- the thickness of the movable plate 4 is preferably set to 0.03 mm to 3 mm. By being 0.03 mm or more, when the amount of expansion deformation of the case 2 increases due to an increase in internal pressure, the perforation protrusion 5 of the movable plate 4 reliably breaks through the case 2 from the inside to form the vent hole 50. The space can be saved and the weight can be reduced by being 3 mm or less.
- the shape of the piercing projection 5 of the movable plate 4 is not particularly limited as long as it has a tip shape that can be inserted into the case 2 (can be inserted). It is preferably formed in a sharp shape.
- the opening angle ⁇ of the tip of the piercing projection 5 is preferably set in the range of 3 degrees to 20 degrees in plan view. (See FIGS. 4 and 8). By setting the opening angle ⁇ in such an angle range, when the amount of expansion and deformation of the case 2 increases due to an increase in internal pressure, the perforation projection 5 of the movable plate 4 ensures that the case 2 is brought in from the inside.
- the ventilation hole 50 can be reliably formed by breaking through.
- the movable plate 4 is provided with a plurality of perforation projections 5.
- the present invention is not limited to such a configuration. You may employ
- the thickness of the base plate 7 is preferably set to 0.05 mm to 3 mm. If it is 0.05 mm or more, the base plate 7 can be sufficiently prevented from being deformed when the internal pressure of the case is increased, and if it is 3 mm or less, space can be saved, and weight can be reduced. be able to.
- the induction film 6 is a resin film having a thickness of 0.01 mm to 0.2 mm.
- the resin film constituting the induction film 6 it is preferable to use the following materials having chemical resistance.
- Examples of the adhesive constituting the adhesive layer 83 of the composite film include an olefin resin adhesive.
- the thickness of the adhesive layer 83 is preferably set to 0.5 ⁇ m to 5 ⁇ m. When the thickness is 0.5 ⁇ m or more, sufficient adhesive strength can be secured, and when the thickness is 5 ⁇ m or less, the cost can be reduced.
- the exterior material 70 includes a heat-resistant resin stretched film layer 71 as an outer layer, a thermoplastic resin unstretched film layer 75 as an inner layer, and an aluminum foil layer 73 disposed between the two film layers. It is preferable to use an exterior material.
- a heat resistant resin stretched film layer (outer layer) 71 is laminated and integrated on the upper surface of the aluminum foil layer 73 via a first adhesive layer 72, and the aluminum foil layer 73 It is particularly preferable to adopt a configuration in which a thermoplastic resin unstretched film layer (inner layer) 75 is laminated and integrated on the lower surface via the second adhesive layer 74.
- the heat-resistant resin stretched film layer (outer layer) 71 is a member that mainly plays a role of ensuring good moldability as an exterior material, that is, plays a role of preventing breakage due to necking of the aluminum foil during molding. It is.
- stretched polyamide and stretched polyester are suitable as the heat resistant resin stretched film 71.
- the thickness of the heat-resistant resin stretched film layer 71 is preferably set to 12 ⁇ m to 50 ⁇ m.
- thermoplastic resin unstretched film layer (inner layer) 75 has excellent chemical resistance against highly corrosive electrolytes used in lithium ion secondary batteries and the like, and heat seals the exterior material. It plays a role of imparting sex.
- the thermoplastic resin unstretched film layer 75 is not particularly limited, but is composed of an unstretched film composed of at least one thermoplastic resin selected from the group consisting of polyethylene, modified polyethylene, polypropylene, and modified polypropylene. Preferably it is done.
- the thickness of the thermoplastic resin unstretched film layer 75 is preferably set to 20 ⁇ m to 80 ⁇ m.
- the aluminum foil layer 73 plays a role of imparting a gas barrier property to prevent the entry of oxygen and moisture into the exterior material.
- a foil made of pure Al or an Al—Fe alloy and having a thickness of 20 ⁇ m to 100 ⁇ m is preferably used.
- the first adhesive layer 72 is not particularly limited, but a polyether polyurethane adhesive layer and a polyester polyurethane adhesive layer are suitable.
- the second adhesive layer 74 is not particularly limited, but an olefin resin adhesive layer such as acid-modified polyolefin such as maleic anhydride-modified polyethylene and maleic anhydride-modified polypropylene is suitable.
- an olefin resin adhesive layer such as acid-modified polyolefin such as maleic anhydride-modified polyethylene and maleic anhydride-modified polypropylene is suitable.
- the thickness of the exterior material 70 (the thickness of the constituent wall of the case 2) is preferably set to 50 ⁇ m to 250 ⁇ m.
- the thickness of the exterior material 70 (the thickness of the constituent wall of the case 2) is more preferably set to 65 ⁇ m to 150 ⁇ m.
- FIG. 12 shows a configuration example of the electrochemical device body 3.
- the electrode part which is the main part of the main body part 3 has positive electrode current collectors 91 and negative electrode current collectors 92 alternately stacked between plastic porous separators 93, 94, 95.
- This is a configuration (FIG. 12), and a configuration in which a plurality of these laminates are stacked or a configuration in which a plurality of turns are wound is adopted.
- the electrochemical device body 3 is not particularly limited, and examples thereof include a battery body, a capacitor body, and a capacitor body.
- the joint between the induction film 6 and the inner surface (inner layer 75) of the case 2 is, for example, chemically resistant. You may carry out using an adhesive agent and you may carry out by the heat sealing
- derivation film 6 and the movable board 4 may be performed using the adhesive agent with chemical resistance, for example, and at least the surface of the movable board 4 is the surface.
- it is a resin, it may be carried out by heat fusion of both.
- the base plate 7 and the inner surface (inner layer 75) of the case 2 may be joined using, for example, a chemical-resistant adhesive, or the base plate 7 In the case where at least the surface of the resin is a resin, it may be carried out by thermal fusion of both.
- the area of the first joint portion 41 is preferably set to be equal to or less than half of the area of the upper wall 22 of the case 2.
- the area of the third joint 43 is preferably set to be equal to or less than one half of the area of the lower wall 23 of the case 2.
- the width of the heat seal (the width of the bonding portion) is , 0.5 mm or more is preferable. Sealing can be reliably performed by setting it as 0.5 mm or more.
- the width of the heat seal (the width of the joining portion) is preferably set to 3 mm to 15 mm.
- Example 1 A battery with a safety device (an electrochemical device with a safety device) 1 having the configuration shown in FIG. 5 was manufactured. The details of each component used are as follows.
- Base plate 7 A rectangular base plate having a width of 33 mm and a height of 4 mm obtained by punching out a homopolypropylene sheet having a thickness of 1 mm (see FIG. 9).
- (Movable plate 4) A movable plate obtained by processing the upper end portion of a homopolypropylene sheet having a thickness of 1 mm and having a plurality of perforation projections 5 protruding from the upper end (see FIG. 8).
- the opening angle ( ⁇ ) of the sharpened tip at the tip of the piercing projection 5 was 15 degrees (see FIG. 8).
- Induction film 6 A 45 ⁇ m-thick induction film (length 63 mm ⁇ width 33 mm) obtained by pasting a stretched polyester film 81 having a thickness of 12 ⁇ m and an unstretched polypropylene film 82 having a thickness of 30 ⁇ m with a polyolefin-based adhesive 83 (see FIG. 11) ).
- Example material 70 A stretched nylon film (outer layer) 71 having a thickness of 25 ⁇ m is bonded to one surface of a soft aluminum foil 73 defined by JIS A8079 having a thickness of 40 ⁇ m with a polyester-urethane adhesive 72, and the soft aluminum foil is bonded.
- Two exterior materials 70 (see FIG. 10) obtained by curing were prepared.
- One exterior material was subjected to deep drawing with a depth of 4 mm using a male 50 mm long ⁇ 33 mm wide to obtain a molded exterior material 70 molded into a three-dimensional shape (substantially box-shaped with the upper surface opened). (See FIG. 9).
- the other exterior material 70 was used in a flat shape.
- Battery body 3 (Battery body 3) Stack 40 sheets of soft aluminum foil 30 ⁇ m thick, polypropylene film 30 ⁇ m thick, and soft copper foil 30 ⁇ m thick and punched into a size of 47mm x 33mm. A simulated product of Part 3 was created.
- Example 1 Each component was prepared as described above. Next, one end portion of the induction film 6 in the length direction (of the unstretched polypropylene film 82) is superposed on the lower end portion of the movable plate 4, and the superposed portion is heated to 200 ° C. A fourth joint 44 was formed by performing heat sealing with a plate for 2 seconds to perform welding and joining, and the movable plate 4 and the induction film 6 were connected. In addition, in this Example 1, as shown in FIG.
- the base plate 7 is disposed in the vicinity of the one side wall 21 of the molded exterior material 70 molded into the three-dimensional shape (substantially box shape with the upper surface opened), and the lower end of the base plate 7
- the inner surface (unstretched polypropylene film 75) of the one side wall 21 of the case 2 is welded and joined to form a fifth joint 45, and in the gap between the one side wall 21 of the molded exterior material 70 and the base plate 7,
- the movable plate 4 connected to the guide film 6 is arranged with the perforation projection 5 on the upper side, and the guide film 6 is passed over the upper end 7a of the base plate 7 and then lowered in parallel with the base plate 7.
- a third joint 43 was formed.
- the welding joint for forming the third joint portion 43 was heated to 200 ° C. on the top surface of the induction film 6 (on the surface of the stretched polyester film 81) disposed on the bottom surface in the concave portion of the molded exterior material 70.
- a 10 mm ⁇ 10 mm metal hot plate was pressed for 1 second and heat sealed.
- an electrolytic solution (ethylene carbonate: dicarbonate) is formed on the upper surface of the battery body 3.
- An electrolyte having a LiPF 6 concentration of 1 mol / L obtained by adding LiPF 6 to a mixed carbonate in which methylene carbonate: dimethyl carbonate is mixed at a volume ratio of 1: 1: 1.
- Example 2 A battery with a safety device (simulated product) was obtained in the same manner as in Example 1 except that the thickness of the movable plate was changed to 0.5 mm.
- Example 3 Instead of a 1 mm thick polypropylene movable plate, a 0.1 mm thick polycarbonate sheet and a 0.03 mm thick polypropylene sheet are bonded with a polyolefin adhesive.
- the induction film 6 is a 45 ⁇ m thick induction film obtained by bonding a stretched polypropylene film 81 having a thickness of 12 ⁇ m and an unstretched polypropylene film 82 having a thickness of 30 ⁇ m with a polyolefin adhesive 83.
- a battery with a safety device (simulated product) was obtained in the same manner as in Example 1 except that (length 63 mm ⁇ width 33 mm) was used.
- the one end part (lower end part) in the part 6B extended below the induction film 6 is turned upward, and is slightly inward (to the movable plate 4 side).
- the fourth joint portion 44 was formed by welding and joining the unstretched polypropylene film 82 surface of the guide film 6 to the lower end portion of the polypropylene sheet surface of the movable plate 4.
- Example 4 Instead of a 1 mm thick polypropylene movable plate, a 0.05 mm thick stainless steel foil (JIS304-H) was immersed in a solution of maleic anhydride-modified polypropylene dispersed in toluene, and then at 200 ° C. for 30 seconds.
- a movable plate having the same shape and the same size formed by forming a coating layer having a thickness of 3 ⁇ m on the entire surface of the stainless steel foil by performing the baking process, the induction film 6 is stretched by a thickness of 12 ⁇ m.
- Example 1 except that a 45 ⁇ m-thick induction film (length 63 mm ⁇ width 33 mm) obtained by laminating a polypropylene film 81 and an unstretched polypropylene film 82 having a thickness of 30 ⁇ m with a polyolefin adhesive 83 is used. In the same manner, a battery with a safety device (simulated product) was obtained.
- Example 4 as shown in FIG. 13, one end portion (lower end portion) of the portion 6 ⁇ / b> B extending below the induction film 6 is directed upward and slightly inward (to the movable plate 4 side).
- the fourth joint 44 was formed by welding and joining the unstretched polypropylene film 82 surface of the guide film 6 to the lower end of the maleic anhydride-modified polypropylene coating layer of the movable plate 4.
- Example 1 A battery (simulated product) was obtained in the same manner as in Example 1 except that the base plate, the movable plate, and the induction film were not used (the safety device was not provided).
- ⁇ Rupture prevention performance evaluation method Nine samples were prepared for each example and comparative example, and each sample was placed in a constant temperature bath of 40 ° C., a constant temperature bath of 60 ° C., and a constant temperature bath of 80 ° C., and in this state for 24 hours. After the passage of time, samples are taken out from the thermostatic chamber, and for each sample, there is an external release of gas from the vent formed by the operation of the safety device (protrusion for punching a movable plate due to expansion of the case due to gas generation) Through the case from the inside to form a vent and check whether the gas in the case has escaped to the outside), and if there is no external release of gas, the case is inflated and deformed using a digital caliper.
- the safety device protrusion for punching a movable plate due to expansion of the case due to gas generation
- the amount of expansion deformation of the battery case in the height direction (the maximum value of the upward expansion amount and the maximum value of the downward expansion amount; see FIG. 6) (mm) was measured.
- Table 1 the sample taken out of the thermostatic chamber was found to release gas from the vent formed by the operation of the safety device to the outside (the rise in the internal pressure of the case was eliminated) Is represented as “ ⁇ ”.
- the electrochemical devices with safety devices of Examples 1 to 4 according to the present invention generate less gas in the battery case under the condition of 40 ° C.
- the vent was not formed by the operation of the safety device.
- the amount of expansion deformation of the case due to gas generation increases under the conditions of 60 ° C. and 80 ° C., and the protrusions for punching the movable plate
- the gas inside the case was released to the outside by breaking through from the inside, thereby preventing the case from bursting due to an increase in internal pressure.
- the electrochemical device with a safety device is, for example, 1) Lithium polymer batteries, lithium ion batteries, lithium ion capacitors, electric double layer capacitors used for mobile devices such as smartphones and tablets 2) Power sources for hybrid cars, electric cars, etc. 3) Wind power generation, solar power generation, nighttime electricity
- Lithium polymer batteries, lithium ion batteries, lithium ion capacitors, electric double layer capacitors used for mobile devices such as smartphones and tablets 2) Power sources for hybrid cars, electric cars, etc. 3) Wind power generation, solar power generation, nighttime electricity
- it is not particularly limited to such applications.
- the electrochemical device safety device according to the present invention is suitably used as, for example, a battery safety device or a capacitor safety device, but is not particularly limited to such applications.
- Electrochemical device 2 ... Case 3 ... Electrochemical device main-body part 4 ... Movable board 4b ... Lower end 5 of movable board ... Protrusion 6 for perforation
- Induction film 6A ... The part 6B extended upwards ... Base part 7 ... Base plate 7a ... Upper end 10 of base plate ... Safety device 21 ... Side wall 22 of case ... Upper wall 23 of case ... Lower wall 31 of case ... Side face 32 of main part ... Upper face 33 of main part ... Main part Lower surface 41 of the part ... 1st joined part 42 ... 2nd joined part 43 ... 3rd joined part 44 ... 4th joined part 50 ... Vent
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- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Description
前記ケースと前記本体部の間に、穿孔用突起を備えた移動可能板が配置され、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、この膨張変形に連動して前記移動可能板の穿孔用突起が前記ケースに向かって移動するように構成されていることを特徴とする安全装置付き電気化学デバイス。
前記ケースの少なくとも1つの側壁と、前記本体部との間に、上方側に穿孔用突起を備えた移動可能板が配置され、
前記ケースの上壁と前記本体部の上面との間に誘導フィルムが配置されると共に、該ケースの上壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第1接合部が形成され、
前記誘導フィルムは、前記本体部と前記移動可能板の間に挿通されて下方に延ばされて配置され、さらに該移動可能板の下端と前記ケースの下壁の間に挿通されて上方に向けて折り返されてさらに上方に延ばされて配置され、該上方に延ばされた部分の一部が、前記ケースの側壁の内面に接合されて第2接合部が形成され、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、該膨張変形による前記ケースの上壁の上方移動に連動して前記誘導フィルムの第1接合部が上方に移動することにより、前記移動可能板の下端と前記ケースの下壁の間に存在する誘導フィルムが上方に移動し、これにより前記移動可能板が上方に持ち上げられて該移動可能板の穿孔用突起が前記ケースの上壁に向かって移動するものとなされていることを特徴とする安全装置付き電気化学デバイス。
前記ケースの少なくとも1つの側壁と、前記本体部との間に、ベース板が配置され、該ベース板の下方側の一部が前記ケースの内面に接合され、
前記ケースの少なくとも一側壁と、前記ベース板との間に、上方側に穿孔用突起を備えた移動可能板が配置され、
前記ケースの下壁と前記本体部の下面との間に誘導フィルムが配置されると共に、該ケースの下壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第3接合部が形成され、
前記誘導フィルムは、前記本体部と前記ベース板の間に挿通されて上方に延ばされ、さらに該ベース板の上端と前記ケースの上壁の間に挿通されて下方に向けて折り返されてさらに下方に延ばされて前記ベース板と前記移動可能板の間に挿通配置され、該下方に延ばされた部分の一部が、前記移動可能板に接合されて第4接合部が形成され、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、該膨張変形による前記ケースの下壁の下方移動に連動して前記誘導フィルムの第3接合部が下方に移動することにより、前記ベース板と前記移動可能板の間に存在する誘導フィルムが上方に移動し、これにより前記移動可能板が上方に持ち上げられて該移動可能板の穿孔用突起が前記ケースの上壁に向かって移動するものとなされていることを特徴とする安全装置付き電気化学デバイス。
前記ケースと前記本体部の間に配置され、穿孔用突起を備えた移動可能板を備え、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、この膨張変形に連動して前記移動可能板の穿孔用突起が前記ケースに向かって移動するように構成されていることを特徴とする電気化学デバイス用安全装置。
前記ケースの少なくとも1つの側壁と前記本体部との間に配置され、上方側に穿孔用突起を備えた移動可能板と、
前記ケースと前記本体部との間に配置された誘導フィルムと、を備え、
前記ケースの上壁と前記本体部の上面との間に前記誘導フィルムの一部が配置されると共に、該ケースの上壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第1接合部が形成され、
前記誘導フィルムは、前記本体部と前記移動可能板の間に挿通されて下方に延ばされて配置され、さらに該移動可能板の下端と前記ケースの下壁の間に挿通されて上方に向けて折り返されてさらに上方に延ばされて配置され、該上方に延ばされた部分の一部が、前記ケースの側壁の内面に接合されて第2接合部が形成されていることを特徴とする電気化学デバイス用の安全装置。
前記ケースの少なくとも1つの側壁と前記本体部との間に配置されたベース板と、
前記ケースの少なくとも1つの側壁と前記ベース板との間に配置され、上方側に穿孔用突起を備えた移動可能板と、
前記ケースと前記本体部との間に配置された誘導フィルムと、を備え、
前記ベース板の下方側の一部が前記ケースの内面に接合され、
前記ケースの下壁と前記本体部の下面との間に前記誘導フィルムの一部が配置されると共に、該ケースの下壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第3接合部が形成され、
前記誘導フィルムは、前記本体部と前記ベース板の間に挿通されて上方に延ばされ、さらに該ベース板の上端と前記ケースの上壁の間に挿通されて下方に向けて折り返されてさらに下方に延ばされて前記ベース板と前記移動可能板の間に挿通配置され、該下方に延ばされた部分の一部が、前記移動可能板に接合されて第4接合部が形成されていることを特徴とする電気化学デバイス用の安全装置。
1)延伸ポリエステルフィルム、延伸ポリカーボネートフィルムの単層品
2)未延伸ポリエチレンフィルム、未延伸酸変性ポリエチレンフィルム、未延伸ポリプロピレンフィルム、未延伸酸変性ポリプロピレンフィルム、未延伸フッ素フィルムの単層品
3)1)で挙げた延伸フィルム81と2)で挙げた未延伸フィルム82とを接着剤層83を介して積層した複合フィルム(図11参照)。
上述した図5に示す構成の安全装置付き電池(安全装置付き電気化学デバイス)1を製作した。使用した各構成材の詳細は以下のとおりである。
厚さ1mmのホモポリプロピレンシートを打ち抜くことによって得た横33mm×高さ4mmの矩形状のベース板(図9参照)。
厚さ1mmのホモポリプロピレンシートの上端部を加工することによって得られた、上端に穿孔用突起5が複数個突設された移動可能板(図8参照)。穿孔用突起5の先端の先鋭部の開き角度(α)は15度であった(図8参照)。
厚さ12μmの延伸ポリエステルフィルム81と、厚さ30μmの未延伸ポリプロピレンフィルム82とが、ポリオレフィン系接着剤83で貼合されてなる厚さ45μmの誘導フィルム(縦63mm×横33mm)(図11参照)。
厚さ40μmのJIS A8079で規定される軟質アルミニウム箔73の一方の面に、ポリエステル-ウレタン系接着剤72を介して厚さ25μmの延伸ナイロンフィルム(外側層)71を貼合し、前記軟質アルミニウム箔73の他方の面に、無水マレイン酸変性ポリプロピレン(ポリオレフィン系接着剤)74を介して厚さ40μmの未延伸ポリプロピレンフィルム(内側層)75を貼合した後、40℃恒温槽にて3日間の養生を行うことによって得られた外装材70(図10参照)を2枚準備した。一方の外装材に、縦50mm×横33mmの雄型で深さ4mmの深絞り成形を行うことによって、立体形状(上面が開放された略箱形状)に成形された成形外装材70を得た(図9参照)。他方の外装材70は、平面状のまま使用した。
厚さ30μmの軟質アルミニウム箔、厚さ30μmのポリプロピレンフィルム、厚さ30μmの軟質の銅箔を層状に重ね合わせて縦47mm×横33mmの大きさに打ち抜いたものを40枚積層して、電池本体部3の模擬品を作成した。
移動可能板の厚さ1mmを厚さ0.5mmに変更した以外は、実施例1と同様にして、安全装置付き電池(模擬品)を得た。
厚さ1mmのポリプロピレン製の移動可能板に代えて、厚さ0.1mmのポリカーボネートシートと厚さ0.03mmのポリプロピレンシートをポリオレフィン接着剤で貼合してなる、同一形状、同一大きさの移動可能板を用いると共に、誘導フィルム6として、厚さ12μmの延伸ポリプロピレンフィルム81と、厚さ30μmの未延伸ポリプロピレンフィルム82とが、ポリオレフィン系接着剤83で貼合されてなる厚さ45μmの誘導フィルム(縦63mm×横33mm)を用いた以外は、実施例1と同様にして、安全装置付き電池(模擬品)を得た。
厚さ1mmのポリプロピレン製の移動可能板に代えて、厚さ0.05mmのステンレス箔(JIS304-H)を、無水マレイン酸変性ポリプロピレンをトルエンに分散した液に浸漬した後、200℃で30秒間焼き付け処理を行うことによって、ステンレス箔の表面の全体に厚さ3μmの被覆層を形成してなる、同一形状、同一大きさの移動可能板を用いると共に、誘導フィルム6として、厚さ12μmの延伸ポリプロピレンフィルム81と、厚さ30μmの未延伸ポリプロピレンフィルム82とが、ポリオレフィン系接着剤83で貼合されてなる厚さ45μmの誘導フィルム(縦63mm×横33mm)を用いた以外は、実施例1と同様にして、安全装置付き電池(模擬品)を得た。
ベース板、移動可能板及び誘導フィルムを使用しないものとした(安全装置を設けない構成とした)以外は、実施例1と同様にして、電池(模擬品)を得た。
各実施例、比較例ごとにそれぞれ9個のサンプルを準備し、40℃の恒温槽、60℃の恒温槽、80℃の恒温槽の中に、それぞれ3個づつ配置し、この状態で24時間経過させた後、恒温槽からサンプルを取り出し、各サンプル毎に、安全装置の作動によって形成された通気孔からのガスの外部放出の有無(ガス発生によるケースの膨張により移動可能板の穿孔用突起がケースを内側から突き破って通気孔を形成してケース内のガスが外部に抜け出ていたか否か)を調べると共に、ガスの外部放出がなくてケースが膨張変形していたものについてはデジタルノギスを用いて電池のケースの高さ方向の膨張変形量(上方への膨張量の最大値と下方への膨張量の最大値の合計;図6参照)(mm)を測定した。なお、表1中において、恒温槽から取り出したサンプルに、安全装置の作動によって形成された通気孔からのガスの外部への放出が認められたもの(ケースの内圧上昇が解消されていたもの)は、「○」と表記した。
1)スマートフォン、タブレット等の携帯機器に使用されるリチウムポリマー電池、リチウムイオン電池、リチウムイオンキャパシタ、電気二重層コンデンサ
2)ハイブリッド自動車、電気自動車等の電源
3)風力発電、太陽光発電、夜間電気の蓄電用に使用される電池やコンデンサ
等として好適であるが、特にこのような用途に限定されるものではない。
2…ケース
3…電気化学デバイス本体部
4…移動可能板
4b…移動可能板の下端
5…穿孔用突起
6…誘導フィルム
6A…上方に延ばされた部分
6B…下方に延ばされた部分
7…ベース板
7a…ベース板の上端
10…安全装置
21…ケースの側壁
22…ケースの上壁
23…ケースの下壁
31…本体部の側面
32…本体部の上面
33…本体部の下面
41…第1接合部
42…第2接合部
43…第3接合部
44…第4接合部
50…通気孔
Claims (12)
- ケースの内部に電気化学デバイス本体部が封入されてなる電気化学デバイスにおいて、
前記ケースと前記本体部の間に、穿孔用突起を備えた移動可能板が配置され、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、この膨張変形に連動して前記移動可能板の穿孔用突起が前記ケースに向かって移動するように構成されていることを特徴とする安全装置付き電気化学デバイス。 - ケースの内部に電気化学デバイス本体部が封入されてなる電気化学デバイスにおいて、
前記ケースの少なくとも1つの側壁と、前記本体部との間に、上方側に穿孔用突起を備えた移動可能板が配置され、
前記ケースの上壁と前記本体部の上面との間に誘導フィルムが配置されると共に、該ケースの上壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第1接合部が形成され、
前記誘導フィルムは、前記本体部と前記移動可能板の間に挿通されて下方に延ばされて配置され、さらに該移動可能板の下端と前記ケースの下壁の間に挿通されて上方に向けて折り返されてさらに上方に延ばされて配置され、該上方に延ばされた部分の一部が、前記ケースの側壁の内面に接合されて第2接合部が形成され、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、該膨張変形による前記ケースの上壁の上方移動に連動して前記誘導フィルムの第1接合部が上方に移動することにより、前記移動可能板の下端と前記ケースの下壁の間に存在する誘導フィルムが上方に移動し、これにより前記移動可能板が上方に持ち上げられて該移動可能板の穿孔用突起が前記ケースの上壁に向かって移動するものとなされていることを特徴とする安全装置付き電気化学デバイス。 - ケースの内部に電気化学デバイス本体部が封入されてなる電気化学デバイスにおいて、
前記ケースの少なくとも1つの側壁と、前記本体部との間に、ベース板が配置され、該ベース板の下方側の一部が前記ケースの内面に接合され、
前記ケースの少なくとも一側壁と、前記ベース板との間に、上方側に穿孔用突起を備えた移動可能板が配置され、
前記ケースの下壁と前記本体部の下面との間に誘導フィルムが配置されると共に、該ケースの下壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第3接合部が形成され、
前記誘導フィルムは、前記本体部と前記ベース板の間に挿通されて上方に延ばされ、さらに該ベース板の上端と前記ケースの上壁の間に挿通されて下方に向けて折り返されてさらに下方に延ばされて前記ベース板と前記移動可能板の間に挿通配置され、該下方に延ばされた部分の一部が、前記移動可能板に接合されて第4接合部が形成され、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、該膨張変形による前記ケースの下壁の下方移動に連動して前記誘導フィルムの第3接合部が下方に移動することにより、前記ベース板と前記移動可能板の間に存在する誘導フィルムが上方に移動し、これにより前記移動可能板が上方に持ち上げられて該移動可能板の穿孔用突起が前記ケースの上壁に向かって移動するものとなされていることを特徴とする安全装置付き電気化学デバイス。 - 前記誘導フィルムとして、厚さ0.01mm~0.2mmの樹脂フィルムが用いられている請求項2または3に記載の安全装置付き電気化学デバイス。
- 前記移動可能板は、樹脂板、セラミック板、ガラス板及び樹脂被覆金属板からなる群より選ばれる少なくとも1種の材料で構成されている請求項1~4のいずれか1項に記載の安全装置付き電気化学デバイス。
- 前記ケースは、外側層としての耐熱性樹脂延伸フィルム層と、内側層としての熱可塑性樹脂未延伸フィルム層と、これら両フィルム層間に配設されたアルミニウム箔層とを含む外装材で形成されている請求項1~5のいずれか1項に記載の安全装置付き電気化学デバイス。
- 前記ケースの膨張変形量が大きくなったときに、前記移動可能板の穿孔用突起が前記ケースを内側から突き破って通気孔を形成し、前記ケース内のガスが、前記通気孔を介して外部に抜けることによって、内圧上昇によるケースの破裂を防止し得るものとなされている請求項1~6のいずれか1項に記載の安全装置付き電気化学デバイス。
- ケースの内部に電気化学デバイス本体部が封入されてなる電気化学デバイス用の安全装置であって、
前記ケースと前記本体部の間に配置され、穿孔用突起を備えた移動可能板を備え、
前記ケース内での発生ガスによる内圧上昇により該ケースが膨張変形したときに、この膨張変形に連動して前記移動可能板の穿孔用突起が前記ケースに向かって移動するように構成されていることを特徴とする電気化学デバイス用安全装置。 - ケースの内部に電気化学デバイス本体部が封入されてなる電気化学デバイス用の安全装置であって、
前記ケースの少なくとも1つの側壁と前記本体部との間に配置され、上方側に穿孔用突起を備えた移動可能板と、
前記ケースと前記本体部との間に配置された誘導フィルムと、を備え、
前記ケースの上壁と前記本体部の上面との間に前記誘導フィルムの一部が配置されると共に、該ケースの上壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第1接合部が形成され、
前記誘導フィルムは、前記本体部と前記移動可能板の間に挿通されて下方に延ばされて配置され、さらに該移動可能板の下端と前記ケースの下壁の間に挿通されて上方に向けて折り返されてさらに上方に延ばされて配置され、該上方に延ばされた部分の一部が、前記ケースの側壁の内面に接合されて第2接合部が形成されていることを特徴とする電気化学デバイス用の安全装置。 - ケースの内部に電気化学デバイス本体部が封入されてなる電気化学デバイス用の安全装置であって、
前記ケースの少なくとも1つの側壁と前記本体部との間に配置されたベース板と、
前記ケースの少なくとも1つの側壁と前記ベース板との間に配置され、上方側に穿孔用突起を備えた移動可能板と、
前記ケースと前記本体部との間に配置された誘導フィルムと、を備え、
前記ベース板の下方側の一部が前記ケースの内面に接合され、
前記ケースの下壁と前記本体部の下面との間に前記誘導フィルムの一部が配置されると共に、該ケースの下壁の内面の少なくとも一部に前記誘導フィルムの一部が接合されて第3接合部が形成され、
前記誘導フィルムは、前記本体部と前記ベース板の間に挿通されて上方に延ばされ、さらに該ベース板の上端と前記ケースの上壁の間に挿通されて下方に向けて折り返されてさらに下方に延ばされて前記ベース板と前記移動可能板の間に挿通配置され、該下方に延ばされた部分の一部が、前記移動可能板に接合されて第4接合部が形成されていることを特徴とする電気化学デバイス用の安全装置。 - 前記誘導フィルムとして、厚さ0.01mm~0.2mmの樹脂フィルムが用いられている請求項9または10に記載の電気化学デバイス用安全装置。
- 前記移動可能板は、樹脂板、セラミック板、ガラス板及び樹脂被覆金属板からなる群より選ばれる少なくとも1種の材料で構成されている請求項8~11のいずれか1項に記載の電気化学デバイス用安全装置。
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