WO2015163004A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
- Publication number
- WO2015163004A1 WO2015163004A1 PCT/JP2015/055963 JP2015055963W WO2015163004A1 WO 2015163004 A1 WO2015163004 A1 WO 2015163004A1 JP 2015055963 W JP2015055963 W JP 2015055963W WO 2015163004 A1 WO2015163004 A1 WO 2015163004A1
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- WO
- WIPO (PCT)
- Prior art keywords
- current
- case
- carrying member
- power storage
- storage device
- Prior art date
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- 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
- H01G11/16—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against electric overloads, e.g. including fuses
-
- 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
- H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
-
- 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
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—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
- H01M50/30—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
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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
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- 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
-
- 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
- Y02E60/13—Energy storage using capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the current interrupting device is disposed between the electrode terminal and the electrode (between the positive electrode terminal and the positive electrode or between the negative electrode terminal and the negative electrode).
- the current interrupting device interrupts conduction between the electrode terminal and the electrode when the pressure in the case of the power storage device rises.
- the current interrupting device of JP 2012-28008 A includes a second current-carrying member facing the first current-carrying member. The second current-carrying member is connected to the electrode. Further, a deformation member is disposed between the first current-carrying member and the second current-carrying member.
- JP 2012-28008 A The end of the deformation member is connected to the first current-carrying member, and the central portion is connected to the second current-carrying member.
- the seal member is disposed between the case and the first current-carrying member.
- JP 2012-28008 A will be referred to as Patent Document 1.
- the power storage device disclosed in the present specification includes a case, an electrode, an electrode terminal, and a current interrupting device.
- the electrode is housed in the case.
- the electrode terminal is fixed to the case and exchanges electricity with the electrode.
- the current interrupting device interrupts conduction between the electrode and the electrode terminal when the pressure in the case exceeds a predetermined value.
- the current interrupting device includes a first current-carrying member, a second current-carrying member, a deformation member, and a first seal member.
- the first conductive member is fixed to the case.
- the first conductive member is connected to the electrode terminal.
- the second conductive member is disposed at a position facing the first conductive member at a distance from the first conductive member.
- the second current-carrying member is connected to the electrode.
- the deformation member is disposed between the first current-carrying member and the second current-carrying member. An end of the deformation member is connected to the first current-carrying member, and a central portion of the deformation member is connected to the second current-carrying member. The deformation member becomes nonconductive with the second current-carrying member when the pressure in the case exceeds a predetermined value.
- the first seal member is disposed between the first current-carrying member and the second current-carrying member. The first seal member keeps the inside of the current interrupting device airtight from the outside of the current interrupting device.
- the power storage device disclosed herein further includes a second seal member. The second seal member is disposed between the case and the first current-carrying member. The second seal member keeps the inside of the case airtight from the outside of the case.
- the material of the second seal member is rubber.
- the above power storage device keeps the inside of the case airtight from the outside of the case by the second seal member.
- the material of the second seal member is rubber.
- the rubber is gas permeable. Therefore, when gas is generated in the case, the gas is gradually permeated through the second seal member before the pressure in the case is excessively increased, and the pressure in the case can be appropriately maintained. As a result, malfunction of the current interrupting device is suppressed.
- the pressure in the case rises rapidly. Therefore, before the gas passes through the second seal member, the pressure in the case exceeds a predetermined value, and the current interrupting device operates to interrupt the conduction between the electrode terminal and the electrode.
- the decrease in the sensitivity of the current interrupting device can be suppressed.
- FIG. 1 shows a cross-sectional view of a power storage device of a first embodiment.
- the expanded sectional view of the electric current interruption apparatus used with the electrical storage apparatus of 1st Example is shown.
- Sectional drawing of the electrical storage apparatus of 2nd Example is shown.
- the expanded sectional view of the electric current interruption apparatus used with the electrical storage apparatus of 2nd Example is shown.
- the storage device includes a case, an electrode assembly, an electrode terminal, and a current interrupting device.
- the electrode assembly is housed in a case and may include a positive electrode and a negative electrode.
- the electrode terminals may pass through the inside and the outside of the case. That is, a part of the electrode terminal may be located outside the case, and another part of the electrode terminal may be located inside the case. Moreover, the electrode terminal may be fixed to the case.
- the electrode terminal may exchange electricity with the electrode (positive electrode or negative electrode).
- the current interrupting device may be connected to the negative electrode terminal and the negative electrode.
- the current interrupting device is disposed on the current path between the negative electrode terminal and the negative electrode, and switches the negative electrode terminal and the negative electrode from the conductive state to the non-conductive state when the internal pressure of the case exceeds a predetermined value.
- the current interrupting device may be connected to the positive electrode terminal and the positive electrode.
- the current interrupting device is disposed on the current path between the positive electrode terminal and the positive electrode, and switches the positive electrode terminal and the positive electrode from the conductive state to the non-conductive state when the internal pressure of the case exceeds a predetermined value.
- the current interrupting device may include a first current-carrying member, a second current-carrying member, a deformation member, and a first seal member.
- the first current-carrying member may be fixed to the case of the power storage device.
- the first current-carrying member may be connected to the electrode terminal.
- the first current-carrying member may be part of the electrode terminal.
- the first current-carrying member may include an enlarged diameter portion positioned in the case, and a protruding portion protruding to the outside of the case through a through hole provided in the case.
- a bolt portion may be provided on the projecting portion.
- the first current-carrying member may be fixed to the case by fastening a nut to a bolt portion provided in the protrusion.
- the size of the enlarged diameter portion may be larger than the through hole provided in the case. That is, part of the enlarged diameter portion may face the case.
- the end face on the electrode assembly side of the first current-carrying member may face the second current-carrying member. At the center of the end face, a recess may be provided which is recessed on the opposite side to the second current-carrying member.
- the second current-carrying member may be disposed at a position facing the first current-carrying member at an interval from the first current-carrying member.
- the second current-carrying member may be connected to the electrode.
- the thickness of the central portion of the second current-carrying member may be thinner than the thickness of the end.
- a breaking groove may be provided which is a starting point of breaking when the pressure in the case exceeds a predetermined value.
- the breaking groove may continuously or intermittently go round in the central portion of the second current-carrying member.
- the breaking groove may be any weak portion that becomes a starting point of breaking when the pressure in the case exceeds a predetermined value, and may be locally provided at the central portion of the second current-carrying member.
- the deformation member may be disposed between the first current-carrying member and the second current-carrying member.
- the end of the deformation member may be connected to the first current-carrying member, and the central portion of the deformation member may be connected to the second current-carrying member.
- the central portion of the deformation member may be fixed to the second current-carrying member at a position surrounded by the breaking groove.
- the deformation member may become nonconductive with the second current-carrying member when the pressure in the case exceeds a predetermined value.
- the central portion When the deformation member is in conduction with the second current-carrying member, the central portion protrudes toward the second current-carrying member, and when not in conduction with the second current-carrying member, the center portion faces the first current-carrying member It may be transformed into a state of suddenness.
- the first seal member may be disposed between the first current-carrying member and the second current-carrying member.
- the first seal member may be insulating.
- the material of the first seal member may be, for example, resin or rubber.
- the first seal member may isolate the space (the internal space of the current interrupting device) surrounded by the first seal member, the first current-passing member and the second current-passing member from the external space of the current interrupting device. That is, the first seal member may keep the internal space of the current interrupting device airtight from the outside.
- the first seal member may seal the first current-passing member and the second current-passing member outside the above-described deformation member.
- a second seal member may be disposed between the inner wall of the case and the first current-carrying member.
- the second seal member may be disposed between the inner wall of the case and the enlarged diameter portion.
- the second seal member may keep the inside of the case airtight from the outside of the case.
- the second seal member may be insulating.
- the material of the second seal member may be, for example, rubber.
- the material of the second seal member may be the same as or different from the material of the first seal member.
- the tightness of the current interrupting device may be more than the tightness of the case. That is, the gas permeability (hereinafter referred to as the first gas permeability) between the first conductive member and the second conductive member sealed by the first seal member is expanded by the case sealed by the second seal member. It may be equal to or less than gas permeability (hereinafter referred to as second gas permeability) between the diameter portions.
- gas permeability hereinafter referred to as second gas permeability
- the material of the first seal member one having a gas permeability lower than that of the material of the second seal member may be used, and the materials of the first seal member and the second seal member are the same.
- the 1 gas permeability may be adjusted to the second gas permeability or less.
- the width of the first seal member (the distance between the inner surface of the current interrupting device and the outer surface) is the width of the second seal member ( The distance between the surface located inside the case and the surface located outside may be equal to or greater than Alternatively, the contact area of the first seal member with the first conductive member and the second conductive member may be equal to or larger than the contact area of the second seal member with the case and the enlarged diameter portion.
- the airtightness of the current interrupting device may be larger than the airtightness of the case.
- the insulating member may be disposed between the first current-carrying member and the second current-carrying member.
- the insulating member may be disposed between the deformation member and the first seal member. That is, the end of the deformation member described above may be fixed to the first current-carrying member inside the insulating member. The distance between the first current-carrying member and the second current-carrying member may be maintained by the insulating member. Outside the range in which the insulating member is provided, a gap may be provided between the first current-carrying member and the second current-carrying member.
- the insulating member may be ring-shaped.
- the insulating member may be disposed between the first current-carrying member and the second current-carrying member without being in contact with the deformation member and the first seal member.
- the hollow which accommodates a part of insulation member may be provided in the end surface by the side of the 2nd electricity supply member of a 1st electricity supply member. More specifically, of the end surfaces of the first current-carrying member on the second current-carrying member side, the surface in contact with the end surface of the insulating member on the first current-carrying member may be recessed from the peripheral surface not in contact with the insulating member. .
- a recess for housing a part of the insulating member may be provided on the end face of the second current-carrying member on the side of the first current-carrying member. That is, of the end surfaces of the second current-carrying member on the first current-carrying member side, the surface in contact with the end surface of the insulating member on the second current-carrying member may be recessed from the peripheral surface not in contact with the insulating member.
- the second deformable member may be disposed on the opposite side of the second conductive member from the deformable member described above.
- the deformable member disposed between the first current conducting member and the second current conducting member will be referred to as a first deformable member
- the deformable member disposed on the opposite side of the second conductive member to the first deformable member Is referred to as a second deformable member.
- the second deformable member may be fixed to the second current-carrying member.
- the second deformation member may be provided between the second conduction member and the electrode assembly.
- a second deformable member may separate the inside and the outside of the current interrupting device.
- the second deformable member may constitute the outer side surface of the current interrupting device, and the pressure in the case may act directly on the second deformable member.
- a projection may be provided at a central portion of the second deformable member on the side of the second conductive member so as to project toward the second conductive member.
- the protrusion may be opposed to a portion surrounded by the fracture groove of the second current-carrying member in a state of being separated from the second current-carrying member.
- the protrusions may be insulating.
- the second deformation member is in a state in which the central portion protrudes in the direction away from the second current-carrying member when the pressure in the case is equal to or less than a predetermined value, and when the pressure in the case exceeds the predetermined value
- the protrusion may move toward the current-carrying member to contact the second current-carrying member.
- the projection may be in contact with the second current-carrying member, and the second current-carrying member may be broken so that the first deformation member and the second current-carrying member do not come in contact with each other.
- the second deformable member may have the same structure as the first deformable member.
- the second deformation member may be made of metal or nonmetal.
- Examples of the power storage device disclosed in the present specification include a secondary battery, a capacitor, and the like.
- an electrode assembly of a secondary battery a laminated type electrode assembly in which a plurality of cells having opposite electrode pairs (negative electrode and positive electrode) are laminated via a separator, and a sheet having electrode pairs opposing via a separator
- the spiral-shaped electrode assembly includes a spiral shaped cell.
- the power storage device disclosed in the present specification can be mounted on, for example, a vehicle and can supply power to a motor.
- the structure of the power storage device will be described.
- a power storage device in which the current interrupting device is connected to the negative electrode terminal and the negative electrode will be described.
- the technology disclosed in the present specification can also be applied to a power storage device in which a current interrupting device is connected to a positive electrode terminal and a positive electrode.
- the power storage device 100 includes a case 18, an electrode assembly 52, a positive electrode terminal 2, a negative electrode terminal 30, and a current interrupting device 50.
- the case 18 is made of metal and has a substantially rectangular parallelepiped shape.
- the case 18 includes a lid 18a and a main body 18b.
- An electrode assembly 52 and a current interrupting device 50 are housed inside the case 18.
- the electrode assembly 52 includes a positive electrode and a negative electrode (not shown).
- the positive electrode tab 16 is fixed to the positive electrode
- the negative electrode tab 20 is fixed to the negative electrode.
- An electrolytic solution is injected into the case 18.
- the positive electrode terminal 2 and the negative electrode terminal 30 pass through the inside and outside of the case 18.
- the positive electrode terminal 2 and the negative electrode terminal 30 are disposed in one direction of the case 18. That is, both the positive electrode terminal 2 and the negative electrode terminal 30 are disposed in the same direction (the side on which the lid 18 a is provided) with respect to the electrode assembly 52.
- the positive electrode terminal 2 is provided with a bolt portion 8.
- the bolt portion 8 is a portion of the positive electrode terminal 2 which is screwed to fasten the nut 10.
- the positive electrode terminal 2 is fixed to the case 18 by fastening a nut 10 to the bolt portion 8.
- One end of the positive electrode terminal 2 is located outside the case 18, and the other end is located inside the case 18.
- the negative electrode terminal 30 is provided with a bolt portion 36.
- the bolt portion 36 is a portion of the negative electrode terminal 30 which is screwed to fasten the nut 38.
- the negative electrode terminal 30 is fixed to the case 18 by fastening a nut 38 to the bolt portion 36.
- One end of the negative electrode terminal 30 is located outside the case 18, and the other end is located inside the case 18.
- the positive electrode lead 14 is connected to the positive electrode terminal 2.
- the positive electrode lead 14 is connected to the positive electrode tab 16.
- the positive electrode terminal 2 is electrically connected to the positive electrode tab 16 via the positive electrode lead 14. That is, the positive electrode terminal 2 is electrically connected to the positive electrode of the electrode assembly 52.
- the positive electrode lead 14 is insulated from the case 18 by the insulating sheet 12.
- the positive electrode terminal 2 and the nut 10 are insulated from the case 18 by the insulating member 58.
- an insulating seal member 56 is disposed between the positive electrode terminal 2 and the case 18.
- the seal member 56 is made of rubber.
- the gap between the positive electrode terminal 2 and the case 18 is sealed by a seal member 56.
- the bus bar 4 is fixed to the positive electrode terminal 2 by the bus bar bolt 6.
- the current interrupting device 50 is connected to the negative electrode terminal 30. Details of the current interrupting device 50 will be described later.
- the current interrupting device 50 is connected to the negative electrode lead 24 via a metal connection member 26.
- the negative electrode terminal 30 is electrically connected to the negative electrode tab 20 via the negative electrode lead 24. That is, the negative electrode terminal 30 is electrically connected to the negative electrode of the electrode assembly 52.
- the negative electrode lead 24 is insulated from the case 18 by the insulating sheet 22.
- the negative electrode terminal 30 and the nut 38 are insulated from the case 18 by the insulating member 28.
- an insulating second seal member 42 is disposed between the negative electrode terminal 30 and the case 18.
- the second seal member 42 is an insulating O-ring.
- the material of the second seal member 42 is rubber.
- the gap between the negative electrode terminal 30 and the case 18 is sealed by the second seal member 42.
- the sealing members 56 and 42 keep the inside of the case 18 airtight from the outside of the case 18.
- the bus bar 32 is
- negative electrode terminal 30 and negative electrode tab 20 are electrically connected via current interrupt device 50 when the pressure in case 18 is less than or equal to a predetermined value. That is, the negative electrode terminal 30 and the negative electrode are electrically connected.
- the current interrupting device 50 interrupts conduction between the negative electrode terminal 30 and the negative electrode tab 20 to prevent current from flowing in the power storage device 100.
- the current interrupting device 50 includes the negative electrode terminal 30, a metal breaking plate 88, and a first deformation member 80 made of metal.
- the negative electrode terminal 30 includes an enlarged diameter portion 37a and a protruding portion 37b.
- the enlarged diameter portion 37 a is located inside the case 18, and the protruding portion 37 b protrudes outside the case 18 through a through hole provided in the case 18.
- the protrusion 37 b is a portion of the negative electrode terminal 30 that protrudes above the case 18.
- the bolt portion 36 is provided on the projecting portion 37 b.
- the bolt portion 36 is a portion of the projecting portion 37 b on the surface of which a thread is provided to fasten the nut 38.
- the negative electrode terminal 30 is an example of a first current-carrying member.
- a part of the enlarged diameter portion 37 a faces the case 18.
- the second seal member 42 is disposed between the enlarged diameter portion 37 a and the case 18.
- a groove 92 and a recess 86 are provided on the broken plate 88 side of the enlarged diameter portion 37a.
- the recess 86 is provided inside the groove 92.
- the end surface 35 on the fracture plate 88 side of the enlarged diameter portion 37a faces the fracture plate 88, and is recessed toward the center. Specifically, the end face 35 is inclined away from the breaking plate 88 as it goes from the end to the center.
- the term "groove” means a form having a bottom surface surrounded by two side walls. Moreover, a "dent” is a form only lower than circumference
- the breaking plate 88 is disposed at a position opposite to the enlarged diameter portion 37a at a distance from the enlarged diameter portion 37a.
- the breaking plate 88 is an example of a second current-carrying member. Between the electrode assembly 52 (see also FIG. 1) and the case 18, above the electrode assembly 52, the breaking plate 88, the first deformation member 80, and the enlarged diameter portion 37a are arranged in this order.
- a groove 96 is provided on the end face of the fracture plate 88 on the side of the enlarged diameter portion 37a.
- the groove 96 is provided at a position facing the groove 92.
- the connection member 26 is fixed to the breaking plate 88.
- the fracture plate 88 is electrically connected to the negative electrode tab 20 via the connection member 26 and the negative electrode lead 24 (see also FIG. 1).
- the thickness of the central portion 88a of the breaking plate 88 is thinner than the thickness of the end 88b.
- a breaking groove 90 is provided in the central portion 88a.
- the fracture groove 90 continuously circles at the central portion 88a.
- a recess 89 is provided on the opposite side of the fracture plate 88 to the enlarged diameter portion 37 a.
- the recess 89 is provided at the end 88 b of the breaking plate 88.
- the first seal member 84 is disposed between the enlarged diameter portion 37 a and the breaking plate 88.
- the first seal member 84 is an insulating O-ring.
- the material of the first seal member 84 is rubber.
- the first seal member 84 insulates the enlarged diameter portion 37 a and the rupture plate 88 and keeps the inside of the current interrupting device 50 airtight. That is, the first seal member 84 seals the enlarged diameter portion 37 a and the breaking plate 88 to block the space inside the current interrupting device 50 from the space outside the current interrupting device 50 (the space in the case 18). ing.
- As a material of the seal members 56 see also FIG. 1), 42 and 84, for example, EPDM (ethylene propylene rubber) can be used.
- the gas permeability (first gas permeability) between enlarged diameter portion 37a and breaking plate 88 is less than the gas permeability (second gas permeability) between case 18 and enlarged diameter portion 37a. is there. More specifically, the gas permeability of the first seal member 84 is adjusted to the gas permeability or less of the second seal member 42. That is, "maintaining airtight" as used herein means that the gas permeability is maintained at or below a predetermined level.
- An insulating member 94 is disposed between the enlarged diameter portion 37 a (negative electrode terminal 30) and the breaking plate 88.
- the insulating member 94 is disposed inside the first seal member 84.
- the insulating member 94 is ring-shaped.
- the insulating member 94 maintains the distance between the enlarged diameter portion 37 a and the breaking plate 88.
- the enlarged diameter portion 37a and the rupture plate 88 are in contact with each other, preventing the two from being directly conducted. Both ends of the insulating member 94 are located in the grooves 92 and 96. Therefore, movement of the insulating member 94 toward the first deformable member 80 and the first seal member 84 is restricted.
- the first deformation member 80 is disposed between the enlarged diameter portion 37 a and the breaking plate 88.
- the first deformation member 80 is a metallic diaphragm.
- the end 80 b of the first deformation member 80 is fixed to the enlarged diameter portion 37 a. More specifically, the end 80b of the first deformable member 80 is welded to the enlarged diameter portion 37a while the outer peripheral edge of the first deformable member 80 is in contact with the side wall of the recess 86 of the enlarged diameter portion 37a.
- the central portion 80a of the first deformation member 80 protrudes away from the enlarged diameter portion 37a. In other words, the first deformation member 80 approaches the breaking plate 88 as it goes from the end 80 b to the central portion 80 a.
- the central portion 80 a of the first deformation member 80 is fixed to the breaking plate 88 inside the breaking groove 90. More specifically, the central portion 80 a is welded to the fracture plate 88 in a range surrounded by the fracture groove 90.
- a support member 78 supports the enlarged diameter portion 37 a of the negative electrode terminal 30 and the breaking plate 88.
- the support member 78 includes a metal outer portion 72, an insulating first inner portion 74, and an insulating second inner portion 75.
- the first inner portion 74 is disposed inside the outer portion 72, and is disposed above the second inner portion 75 (on the case 18 side).
- the second inner portion 75 is disposed on the inner side of the outer portion 72, and is disposed below the first inner portion 74 (on the side of the electrode assembly 52).
- the enlarged diameter portion 37 a and the breaking plate 88 are positioned by the outer portion 72.
- the fracture plate 88 is fixed to the enlarged diameter portion 37 a by caulking the outer portion 72.
- the inner side portions 74 and 75 insulate the enlarged diameter portion 37 a from the breaking plate 88.
- the negative electrode terminal 30 is electrically connected to the negative electrode through the first deformation member 80, the breaking plate 88, the connection member 26, the negative electrode lead 24 and the negative electrode tab 20.
- a gap is provided between the projection 95 and the breaking plate 88.
- the internal pressure of the case 18 rises and exceeds a predetermined value.
- a pressure difference occurs between the inside and the outside of the current interrupting device 50.
- the breaking plate 88 is broken starting from the breaking groove 90.
- the first deformation member 80 and the breaking plate 88 are separated, and the first deformation member 80 and the breaking plate 88 become nonconductive. Since the negative electrode terminal 30 and the negative electrode become nonconductive, it is possible to prevent current from flowing between the positive electrode terminal 2 and the negative electrode terminal 30 (also see FIG. 1).
- the breaking plate 88 When the breaking plate 88 is broken, the central portion 80a of the first deformation member 80 moves from the breaking plate 88 to the enlarged diameter portion 37a. In other words, the first deformation member 80 is reversed. As described above, since the end face 35 of the enlarged diameter portion 37a is recessed, the inversion of the first deformation member 80 is not hindered by the enlarged diameter portion 37a (negative electrode terminal 30). It is possible to prevent the first deformation member 80 and the breaking plate 88 from re-conduction after the breaking plate 88 has broken. That is, it is possible to prevent current from flowing again between the positive electrode terminal 2 and the negative electrode terminal 30 after the pressure in the case 18 rises and the current interrupting device 50 operates.
- the current interrupting device 50 operates to make the negative electrode terminal 30 and the negative electrode nonconductive.
- gas may be generated in the case 18 due to, for example, decomposition of the electrolyte even during the normal state, and the internal pressure of the case 18 may gradually increase.
- the second seal member 42 is made of rubber and has gas permeability. Therefore, the gas generated in the normal state can move to the outside of the case 18 through the inside of the second seal member 42.
- power storage device 100 can prevent internal pressure of case 18 from exceeding a predetermined value in the normal state, and operating current cutoff device 50.
- the gas generated during the normal state moves to the outside of the case 18, whereby the current interrupting device 50 operates only in a state such as overcharge.
- the inner space of the current interrupting device 50 is also made airtight by the outer portion 72 of the support member 78. That is, the gas permeability between the enlarged diameter portion 37a and the fracture plate 88 can be further reduced. Therefore, the gas generated in the case 18 can be prevented from moving from the outside of the current interrupting device 50 to the inside.
- the current interrupting device 50 operates by the pressure difference between the inside and the outside of the current interrupting device 50. Therefore, if the gas permeability between the enlarged diameter portion 37a and the breaking plate 88 is high, the current interrupting device 50 can not operate normally.
- the storage device 100 can further increase the sensitivity of the current interrupting device 50 by using the outer part 72.
- Both ends of the insulating member 94 are located in the grooves 92 and 96, and movement of the insulating member 94 toward the first deformable member 80 and the first seal member 84 is restricted.
- the insulating member 94 can be in contact with the first deformable member 80 to narrow the movable range of the first deformable member 80 or prevent the shape of the first deformable member 80 from being deformed.
- the insulating member 94 can be prevented from coming into contact with the first seal member 84 to narrow the existing space of the first seal member 84. When the space where the first seal member 84 is present is narrowed, the filling rate of the first seal member 84 is increased, and a defect such as breakage of the first seal member 84 may occur.
- Power storage device 200 is a modification of power storage device 100, and the structure of current interrupt device 250 is different from that of current interrupt device 50 of power storage device 100.
- the components of the power storage device 200 that are the same as the power storage device 100 may be given the same reference numerals as the power storage device 100, and the description thereof may be omitted.
- a second deformable member 93 is disposed on the side of the breaking plate 88 opposite to the first deformable member 80. That is, the breaking plate 88 is disposed between the first deforming member 80 and the second deforming member 93.
- the second deformation member 93 is a metal diaphragm.
- An end 93 b of the second deformation member 93 is fixed to the breaking plate 88. More specifically, the end 93 b of the second deformation member 93 is welded to the breaking plate 88 in a state where the outer peripheral edge of the second deformation member 93 abuts on the side wall of the recess 89 of the breaking plate 88.
- An insulating protrusion 95 is provided on the breaking plate 88 side of the second deformable member 93.
- the projection 95 is disposed at the central portion 93 a of the second deformable member 93 and has a shape projecting toward the breaking plate 88.
- the projection 95 is opposed to the central portion 88 a of the breaking plate 88. More specifically, when the current interrupting device 250 is viewed in plan (the direction in which the protrusion 37 b extends, ie, observed from the axial direction of the negative electrode terminal 30), the range in which the protrusion 95 is surrounded by the breaking groove 90 It is located inside.
- the second deformation member 93 protrudes away from the breaking plate 88 as it goes from the end 93 b toward the central portion 93 a.
- the insulating second inner portion 275 extends below the second deformable member 93.
- the second deformable member 93 and the electrode assembly 52 can be brought into contact with each other to prevent the current interrupting device 250 from malfunctioning.
- the second inner portion 275 has a through hole 275 a at the center. Therefore, the central portion 93 a of the second deformable member 93 is not covered by the second inner portion 275. Therefore, application of the internal pressure of the case 18 to the second deformable member 93 is not hindered.
- the projection 95 when the second deformation member 93 is inverted, a part of the projection 95 is located above the breaking plate 88. In other words, the projections 95 pass through the central portion of the rupture plate 88. The projection 95 restricts the movement of the first deformation member 80 downward (toward the breaking plate 88). Therefore, it is possible to more reliably prevent the first deformation member 80 and the breaking plate 88 from conducting again.
- second deformable member 93 separates the inside and the outside of current interrupt device 250. Therefore, the internal pressure change of the case 18 directly acts on the second deformation member 93.
- the breaking plate 88 can be reliably broken when the internal pressure of the case 18 exceeds a predetermined value.
- the breaking plate 88 can be shut off from the outside of the current interrupting device 250 (the inside of the case 18). Even if an arc occurs when the rupture plate 88 fractures, the arc can be prevented from contacting the gas (for example, hydrogen) in the case 18.
- the current interrupting device is connected to the negative electrode lead through the connecting member.
- the connection member and the negative electrode lead may be an integral part. That is, the current interrupting device may be directly connected to the member (negative electrode lead) connected to the negative electrode tab.
- the current interrupting device When the current interrupting device is disposed between the positive electrode terminal and the positive electrode, the current interrupting device may be directly connected to a member (positive electrode lead) connected to the positive electrode tab.
- the above-described power storage device may have a structure in which the gas in the case is gradually moved to the outside of the case by providing a rubber seal member between the electrode terminal (first conducting member) and the case. Therefore, various materials can be used as the structure of the current interrupting device and the components of the power storage device. Below, the material of the components which comprise an electrical storage apparatus is illustrated about the lithium ion secondary battery which is an example of an electrical storage apparatus.
- the electrode assembly includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode.
- the positive electrode has a positive electrode metal foil and a positive electrode active material layer formed on the positive electrode metal foil.
- the positive electrode tab corresponds to a positive electrode metal foil to which a positive electrode active material layer is not applied.
- the negative electrode has a negative electrode metal foil and a negative electrode active material layer formed on the negative electrode metal foil.
- the negative electrode tab corresponds to the negative electrode metal foil on which the negative electrode active material layer is not applied.
- the material active material, binder, conductive additive and the like
- metal foil for positive electrodes aluminum (Al), nickel (Ni), titanium (Ti), stainless steel or a composite material thereof can be used. In particular, aluminum or a composite material containing aluminum is preferable. Further, as the material of the positive electrode lead, the same material as that of the metal foil for positive electrode can be used.
- the positive electrode active material may be any material as long as lithium ions can penetrate and desorb, and Li 2 MnO 3 , Li (NiCoMn) 0.33 O 2 , Li (NiMn) 0.5 O 2 , LiMn 2 O 4 , LiMnO 2 , LiNiO 2 , LiCoO 2 , LiNi 0.8 Co 0.15 Al 0.05 O 2 , Li 2 MnO 2 , LiMn 2 O 4 or the like can be used. Further, an alkali metal such as lithium or sodium, sulfur or the like can also be used as the positive electrode active material. These may be used singly or in combination of two or more.
- the positive electrode active material is applied to the metal foil for the positive electrode together with a conductive material, a binder and the like as needed.
- metal foil for negative electrodes aluminum, nickel, copper (Cu) etc., or those composite materials etc. can be used. In particular, copper or a composite material containing copper is preferable. Further, as the material of the negative electrode lead, the same material as the metal foil for the negative electrode can be used.
- a negative electrode active material a material in which lithium ions can penetrate and desorb is used.
- Alkali metals such as lithium (Li) and sodium (Na)
- the negative electrode active material is particularly preferably a material not containing lithium (Li) in order to improve the battery capacity.
- the negative electrode active material is applied to the metal foil for the negative electrode together with a conductive material, a binder and the like as required.
- the separator uses a porous material having an insulating property.
- a porous film made of a polyolefin resin such as polyethylene (PE) or polypropylene (PP), or a woven or non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose or the like can be used.
- PE polyethylene
- PP polypropylene
- PET polyethylene terephthalate
- the electrolytic solution is preferably a non-aqueous electrolytic solution in which a supporting salt (electrolyte) is dissolved in a non-aqueous solvent.
- Solvents containing a linear ester such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) as a non-aqueous solvent, ethyl acetate, Solvents such as methyl propironate or mixtures thereof can be used.
- a supporting salt electrolyte
- LiPF 6 LiBF 4
- LiAsF 6 LiAsF 6
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Abstract
Description
図1を参照し、蓄電装置100の構造を説明する。蓄電装置100は、ケース18と、電極組立体52と、正極端子2と、負極端子30と、電流遮断装置50を備えている。ケース18は、金属製であり、略直方体形状である。ケース18は、蓋部18aと本体部18bを備えている。ケース18の内部には、電極組立体52と電流遮断装置50が収容されている。電極組立体52は、正極と負極を備えている(図示省略)。正極タブ16が正極に固定されており、負極タブ20が負極に固定されている。ケース18の内部には、電解液が注入されている。
図3及び図4を参照し、蓄電装置200について説明する。蓄電装置200は、蓄電装置100の変形例であり、電流遮断装置250の構造が蓄電装置100の電流遮断装置50と異なる。蓄電装置200について、蓄電装置100と同じ部品は、蓄電装置100と同じ参照番号を付すことにより、説明を省略することがある。
Claims (4)
- ケースと、
前記ケース内に収容された電極と、
前記ケースに固定され、前記電極との間で電気を授受する電極端子と、
前記ケース内の圧力が所定値を超えたときに前記電極と前記電極端子の間の導通を遮断する電流遮断装置と、を有する蓄電装置であって、
前記電流遮断装置は、
前記ケースに固定されているとともに前記電極端子に接続されている第1通電部材と、
前記第1通電部材と間隔をおいて前記第1通電部材に対向する位置に配置されており、前記電極に接続されている第2通電部材と、
前記第1通電部材と前記第2通電部材の間に配置されているとともに、端部が前記第1通電部材に接続されており、中央部が前記第2通電部材に接続されており、前記ケース内の圧力が所定値を超えたときに前記第2通電部材と非導通になる変形部材と、
前記第1通電部材と前記第2通電部材の間に配置されており、前記電流遮断装置の内部を前記電流遮断装置の外部から気密に保つ第1シール部材と、を備えており、
前記ケースと前記第1通電部材の間に、前記ケースの内部を前記ケースの外部から気密に保つ第2シール部材が配置されており、
前記第2シール部材の材料がゴムである蓄電装置。 - 前記第2シール部材によってシールされている前記ケースと前記第1通電部材の間のガス透過性が、前記第1シール部材によってシールされている前記第1通電部材と前記第2通電部材の間のガス透過性以上である請求項1に記載の蓄電装置。
- 前記電流遮断装置は、前記第2通電部材に対して前記変形部材とは反対側に配置されているとともに、前記第2通電部材側に前記第2通電部材に向けて突出した形状の突起が設けられており、前記電流遮断装置の内部と外部を隔てている第2の変形部材をさらに備えており、
前記第1シール部材の材料がゴムである請求項1又は2に記載の蓄電装置。 - 前記蓄電装置は、二次電池である請求項1~3のいずれか一項に記載の蓄電装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020167032445A KR101895365B1 (ko) | 2014-04-23 | 2015-02-27 | 리튬 이온 2차 전지 |
CN201580022434.4A CN106233506A (zh) | 2014-04-23 | 2015-02-27 | 蓄电装置 |
JP2016514760A JP6237892B2 (ja) | 2014-04-23 | 2015-02-27 | 蓄電装置 |
DE112015001923.5T DE112015001923T5 (de) | 2014-04-23 | 2015-02-27 | Vorrichtung zur Speicherung von elektrischer Energie |
US15/303,917 US20170040588A1 (en) | 2014-04-23 | 2015-02-27 | Electrical energy storage device |
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JP2014-089298 | 2014-04-23 | ||
JP2014089298 | 2014-04-23 |
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US (1) | US20170040588A1 (ja) |
JP (1) | JP6237892B2 (ja) |
KR (1) | KR101895365B1 (ja) |
CN (1) | CN106233506A (ja) |
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WO (1) | WO2015163004A1 (ja) |
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EP4170783A1 (en) * | 2016-06-27 | 2023-04-26 | Contemporary Amperex Technology Co., Limited | Top cover of power battery and power battery |
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US11063328B2 (en) * | 2017-01-25 | 2021-07-13 | Sanyo Electric Co., Ltd. | Secondary battery including insulating member with grooves |
KR20220065328A (ko) | 2020-11-13 | 2022-05-20 | 최인호 | 다용도 주행로봇 |
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2015
- 2015-02-27 DE DE112015001923.5T patent/DE112015001923T5/de not_active Withdrawn
- 2015-02-27 US US15/303,917 patent/US20170040588A1/en not_active Abandoned
- 2015-02-27 WO PCT/JP2015/055963 patent/WO2015163004A1/ja active Application Filing
- 2015-02-27 KR KR1020167032445A patent/KR101895365B1/ko active IP Right Grant
- 2015-02-27 CN CN201580022434.4A patent/CN106233506A/zh active Pending
- 2015-02-27 JP JP2016514760A patent/JP6237892B2/ja not_active Expired - Fee Related
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JP2012038529A (ja) * | 2010-08-05 | 2012-02-23 | Toyota Motor Corp | 電池およびそれを搭載する車両,電気機器 |
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EP4170783A1 (en) * | 2016-06-27 | 2023-04-26 | Contemporary Amperex Technology Co., Limited | Top cover of power battery and power battery |
Also Published As
Publication number | Publication date |
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KR101895365B1 (ko) | 2018-09-05 |
JP6237892B2 (ja) | 2017-11-29 |
KR20170010763A (ko) | 2017-02-01 |
US20170040588A1 (en) | 2017-02-09 |
JPWO2015163004A1 (ja) | 2017-04-13 |
CN106233506A (zh) | 2016-12-14 |
DE112015001923T5 (de) | 2017-01-05 |
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