WO2011117971A1 - 電池の製造方法及び電池 - Google Patents
電池の製造方法及び電池 Download PDFInfo
- Publication number
- WO2011117971A1 WO2011117971A1 PCT/JP2010/054983 JP2010054983W WO2011117971A1 WO 2011117971 A1 WO2011117971 A1 WO 2011117971A1 JP 2010054983 W JP2010054983 W JP 2010054983W WO 2011117971 A1 WO2011117971 A1 WO 2011117971A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode terminal
- container
- battery
- hole
- insulating member
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 description 13
- 238000003860 storage Methods 0.000 description 12
- 238000010248 power generation Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 230000004323 axial length Effects 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052987 metal hydride Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- -1 nickel metal hydride Chemical class 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000032953 Device battery issue Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- 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
-
- 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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- 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
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- 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
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a battery, and more particularly, to a technique for improving the sealing performance of a fixing portion between a container and an electrode terminal in a battery that fixes the electrode terminal in a state of penetrating the container and protruding outward.
- a container that is an exterior of a battery is configured by a storage unit, a lid unit, and the like.
- a storage part is a member which stores the electrode body used as the electric power generation element of a battery, and has a bottomed cylinder shape which one surface opens.
- the lid portion is a flat plate-like member having a shape corresponding to the opening surface of the storage portion, and closes the opening surface of the storage portion.
- the lid is provided with a pair of through holes, and electrode terminals (a positive electrode terminal and a negative electrode terminal) are provided so as to protrude outward from the through holes.
- the electrode terminals are positive and negative external terminals for taking out the electric power generated in the electrode body to the outside.
- the container is provided with a safety device such as a safety valve that can communicate in the thickness direction.
- a safety device such as a safety valve that can communicate in the thickness direction.
- the safety valve operates when a large amount of gas is generated inside the battery due to a battery failure such as an internal short circuit, and prevents the internal pressure from rising by connecting the inside and outside of the battery.
- the battery is a non-aqueous electrolyte battery such as a lithium ion secondary battery
- it is necessary to sufficiently increase the sealing degree of the battery since moisture affects the performance when mixed inside the battery.
- the internal pressure rises due to a defect in the battery or the like, it is necessary to securely seal other parts so that the safety device operates reliably.
- the storage part and the lid part are firmly joined by welding or the like, so that the electrode terminal does not fall out of the battery at the fixing part between the electrode terminal and the lid part.
- Patent Document 1 in a battery in which an electrode terminal protrudes from a lid portion of the battery, an insulating member is interposed between the lid portion and the electrode terminal, and a burring portion is provided around the insulating member in the lid portion.
- a technique is disclosed in which the burring portion is caulked from the direction parallel to the extending direction of the lid portion to ensure the sealing performance between the lid portion and the electrode terminal.
- the bulging part gradually loosens due to the action of returning to the shape before caulking, and the sealing performance deteriorates. This is disadvantageous in that the sealing property is insufficient.
- JP 2005-302625 A JP 2005-302625 A
- An object of the present invention is to provide a battery excellent in sealing performance at a fixing portion between a container and an electrode terminal in a battery in which the electrode terminal is fixed in a state of penetrating the container and protruding outward.
- the battery manufacturing method includes a container having a through hole, an electrode terminal fixed to the through hole in a state in which a part protrudes outward of the container, the container, and the An insulating member interposed between the electrode terminal and the electrode terminal, the electrode terminal being directed from an outer peripheral portion to an inner side at an end portion of the through hole in the container.
- a press surface formed as a flat surface the electrode terminal is inserted through the insulating member inside the through hole, the press surface of the electrode terminal is pressed, and the outer peripheral portion of the electrode terminal is The electrode terminal is fixed to the through hole by bulging a part toward the inner peripheral surface side of the through hole.
- the material of the container is preferably iron.
- the battery according to the second aspect of the present invention includes a container having a through hole, an electrode terminal fixed to the through hole in a state in which a part protrudes outward of the container, the container and the electrode terminal, An insulating member interposed therebetween, and the electrode terminal has a press surface formed as a flat surface from the outer peripheral portion toward the inside at the end portion of the through hole of the container in the penetrating direction.
- the electrode terminal is inserted into the through hole through the insulating member, the pressing surface of the electrode terminal is pressed, and a part of the outer peripheral portion of the electrode terminal is on the inner peripheral surface side of the through hole.
- the electrode terminal is fixed to the through hole by being bulged toward the surface.
- the material of the container is preferably iron.
- the present invention it is possible to provide a battery excellent in sealing performance at a fixing portion between the container and the electrode terminal in the battery in which the electrode terminal is fixed while penetrating the container and protruding outward.
- the battery 10 is a single cell of a secondary battery such as a lithium ion secondary battery or a nickel metal hydride battery, and is configured to be chargeable / dischargeable. As shown in FIG. 1, the battery 10 includes a power generation element 20 housed in a container 30. Electrode terminals 40 and 40 are provided so as to protrude outward from the container 30.
- the power generation element 20 is obtained by impregnating an electrode body formed by laminating or winding a positive electrode, a negative electrode, and a separator with an electrolytic solution.
- an electrolytic solution When the battery 10 is charged and discharged, a chemical reaction occurs in the power generation element 20 (strictly speaking, ion movement occurs between the positive electrode and the negative electrode via the electrolytic solution), so that the battery 10 can be charged and discharged. Function as.
- the container 30 is an exterior made of iron (more strictly speaking, nickel-plated iron) including the storage portion 31 and the lid portion 32.
- the storage unit 31 is a bottomed cylindrical member having an open surface, and stores the power generation element 20 therein.
- the lid portion 32 is a flat member having a shape corresponding to the opening surface of the storage portion 31 and is joined to the storage portion 31 in a state where the opening surface of the storage portion 31 is closed.
- iron is selected from the viewpoint of the strength of the storage portion 31 and the lid portion 32.
- it is a metal having a strength equal to or higher than iron (for example, a tensile strength of 100 MPa or more).
- the material used for common batteries, such as aluminum is also applicable.
- the electrode terminal 40 is a current collecting terminal configured as a positive electrode terminal or a negative electrode terminal, and is fixed to the container 30 so as to protrude outward from the outer peripheral portion of the container 30.
- the electrode terminal 40 used as the positive electrode terminal is made of, for example, aluminum
- the electrode terminal 40 used as the negative electrode terminal is made of, for example, copper.
- the electrode terminal 40 is electrically connected to the positive electrode or the negative electrode of the power generation element 20 via an appropriate lead terminal or the like, and power is exchanged between the inside and outside of the battery 10 via the electrode terminals 40 and 40. . That is, the electrode terminals 40 and 40 are external terminals used as a path for electrical connection with the outside.
- a part of the outer periphery of the electrode terminal 40 is threaded by thread rolling in consideration of the convenience at the time of the electrical connection.
- the electrode terminals 40 and 40 are fixed to the lid portion 32 of the container 30 via insulating members 50 and 50, and the insulating properties between the electrode terminals 40 and the container 30 are ensured by the insulating members 50. Further, when the electrode terminal 40 is fixed, the insulating member 50 and the lid portion 32 are pressed outward from the electrode terminal 40 and firmly fixed by pressing and crimping a part of the electrode terminal 40. Yes. Thereby, the sealing property between the cover part 32 and the electrode terminal 40 is ensured.
- the lid portion 32 has a pair of through holes 33 and 33 through which the electrode terminals 40 and 40 can pass.
- the through holes 33 and 33 are holes having a predetermined inner diameter, and penetrate through the lid portion 32 in the thickness direction (vertical direction in the drawing).
- the electrode terminal 40 is a round terminal having a circular cross section, and has a protruding portion 41 and a fixed portion 42 as shown in FIG.
- the protruding portion 41 is a cylindrical portion provided at one end of the electrode terminal 40 (the end on the outer side of the battery 10 and the upper end in the drawing), and protrudes outward from the container 30. It is a cylindrical part.
- the protruding portion 41 is used as a connection portion with a device outside the battery (for example, a power source, a device that uses the power of the battery 10, another battery, etc.), and the connecting terminal of the external device is connected to the protruding portion 41. Fixed. From the viewpoint of the protrusion 41 functioning as a connection part with the outside, a part or all of the outer periphery is subjected to threading as necessary.
- the fixing portion 42 is a columnar portion that is provided continuously to the protruding portion 41, and is a columnar portion that protrudes in the axial direction of the protruding portion 41.
- the fixed portion 42 is formed with a larger diameter than the protruding portion 41.
- the outer diameter of the fixing portion 42 is set according to the inner diameter of the insulating member 50, and the electrode terminal 40 penetrates the lid portion 32 in a state where the insulating member 50 is inserted all around the outer peripheral portion of the fixing portion 42. It is fixed to the hole 33 (see FIG. 4).
- the fixing portion 42 is a portion provided at the other end portion of the electrode terminal 40 (the inner end portion of the battery 10 and the lower end portion in the drawing).
- the fixing portion 42 is fixed to the lid portion 32 and generates power. This is a substantially cylindrical portion connected to the lead terminal connected to the element 20.
- the axial length of the fixed portion 42 is set to be sufficiently larger than the thickness of the lid portion 32, and is set to be sufficiently larger than the axial length of the insulating member 50.
- the press surface 43 is a flat surface formed at the upper end portion of the fixed portion 42, and is provided from the outer peripheral portion of the electrode terminal 40 toward the inside. Further, the press surface 43 is formed as a surface that receives a pressing force by the press when the press tool 60 described later is pressed. That is, the width of the press surface 43 is set to a value that can sufficiently satisfy the press area by the press tool 60.
- the press surface 43 in the electrode terminal 40 has a site
- the diameter of the electrode terminal 40 is sufficiently large, the width of the press surface 43 can be increased, so that a non-pressed portion of the press surface 43 is a seat surface for a nut when electrically connected to the outside. Can also be used.
- the electrode terminal 40 has a stepped structure having the press surface 43 having a predetermined width by the protruding portion 41 and the fixing portion 42 having different outer diameters.
- the electrode terminal 40 is fixed to the through-hole 33 of the lid portion 32, the outer peripheral portion of the press surface 43 is pressed from the outer side of the battery 10, and the fixing portion 42 is plastically deformed to be outside (insulating member). 50 side) to fix.
- an insulating member 50 that electrically insulates the container 30 and the electrode terminal 40 is interposed between the through hole 33 of the lid portion 32 and the fixing portion 42 of the electrode terminal 40.
- the insulating member 50 is an insulator having a shape corresponding to the form of the fixed portion 42, and has a cylindrical shape in the present embodiment.
- the insulating member 50 is wound around the outer peripheral portion of the fixed portion 42. Further, the axial length of the insulating member 50 is set to be approximately the same as or larger than the axial length of the fixed portion 42.
- the length of the insulating member 50 in the axial direction is between the outer peripheral portion of the electrode terminal 40 (particularly the fixed portion 42) and the inner peripheral portion of the lid portion 32 when the electrode terminal 40 is fixed to the lid portion 32. It is set so that a sufficient and sufficient interval is provided for insulation.
- the material of the insulating member 50 is preferably a material having excellent high-temperature creep characteristics, that is, a material having long-term creep resistance against the cooling cycle of the battery 10, and examples thereof include PEEK (polyether ether ketone).
- the insulating member 50 is also a member for ensuring the sealing performance inside the battery 10 in addition to the above insulating properties.
- the outer peripheral portion of the press surface 43 of the electrode terminal 40 is caulked over the entire circumference by being pressed from the outer side (upper side in FIG. 3) of the battery 10 (in other words, The material is plastically flowed by pressing).
- the bulging portion 44 is formed so as to bulge outward from the outer peripheral portion of the fixed portion 42 (strictly, from below the portion pressed on the press surface 43).
- the bulging portion 44 faces the insulating member 50 side ( It is formed so as to swell toward the inner peripheral surface of the through-hole 33.
- the outer peripheral portion of the pressing surface 43 of the electrode terminal 40 is pressed from above and caulked to form the bulging portion 44 that bulges outward, and the surface pressure from the bulging portion 44 is reduced by the insulating member 50. Is transmitted to the inner peripheral surface of the through-hole 33 of the lid portion 32 via.
- the lid 32 is pressed by the surface pressure, and the electrode terminal 40 is fixed to the lid 32 of the container 30.
- the bulging portion 44 is a surface pressed by a strong surface pressure or frictional force acting on the bulging portion because the pressing direction and the bulging direction are caulked at an angle of about 90 °. Does not return easily (that is, the bulging portion 44 does not loosen).
- the electrode terminal 40 and the insulating member 50 are inserted into the through hole 33 in a state where the insulating member 50 is disposed on the outer periphery of the fixing portion 42 of the electrode terminal 40.
- the electrode terminal 40 and the lid part 32 are arranged in a state in which the position is adjusted so that the bulging part 44 formed after pressing faces the inner peripheral surface of the through hole 33.
- the press tool 60 is used to press the outer peripheral portion of the press surface 43 of the electrode terminal 40 from the outer side of the battery 10 by a predetermined press amount, and below the press surface 43 (container The bulging portion 44 is formed on the inner side of 30.
- the bulging portion 44 bulges outward in the radial direction as described above, thereby generating surface pressure on the inner peripheral surfaces of the insulating member 50 and the through hole 33. Due to this surface pressure, the electrode terminal 40 and the insulating member 50 are restrained and fixed to the lid portion 32.
- the press tool 60 is a substantially cylindrical tool having a space through which a part of the electrode terminal 40 can pass, and has a press blade 61 that presses the outer periphery of the press surface 43 at the tip.
- the press tool 60 is configured to be movable in the proximity / separation direction with respect to the electrode terminal 40 by an appropriate driving device. It is assumed that an appropriate jig is used at the time of pressing with the press tool 60, and pressing with the press tool 60 is performed in a state where the lid portion 32, the electrode terminal 40, and the insulating member 50 are held by the jig.
- the battery 10 includes the electrode terminal 40 having a stepped structure including the press surface 43 formed to have a predetermined width.
- the bulging portion 44 is formed by plastic flow of the lower region (press region) outward.
- the insulating member 50 can be firmly fixed in the through hole 33, and adhesion between them can be secured.
- the sealing performance in the through hole 33 that is the fixing portion is improved. it can. Moreover, since the insulating member 50 and the lid portion 32 are deformed in the direction of expanding from the inside to the outside by causing the bulging portion 44 to bulge from the inside, generation of wrinkles in the insulating member 50 and the lid portion 32 is prevented. And the sealing reliability can be improved.
- the material of the lid part 32 is iron which is a high-strength member, it is possible to ensure rigidity in the extending direction of the lid part 32 (left and right direction in the drawing). Therefore, when the internal pressure of the battery 10 rises, resistance (pressure resistance) against external force in the outer peripheral direction applied from the periphery of the electrode terminal 40 (through hole 33) to the lid portion 32 can be secured, and the battery life can be improved.
- the shape of the through hole 33 is a perfect circle having a uniform distance from the center of the hole to the inner peripheral surface, but is not limited thereto.
- the shape of the through hole 33 is an irregular shape such as an ellipse, a rectangle, or a polygon with a non-uniform distance from the center of the hole to the inner peripheral surface.
- the bulging shape (the shape in the press direction view) can also be controlled to the above-mentioned different shape.
- the bulging portion 44 can have an irregular shape other than a perfect circle shape, and it becomes possible to impart torque resistance to the electrode terminal 40, and the electrode terminal 40 rotates when electrically connected to the outside. It is possible to reliably prevent problems caused by this.
- the shape of the protruding portion 41 is circular and the shape of the fixed portion 42 is the above-mentioned different shape with respect to the shape on the electrode terminal 40 side having the stepped structure by the press surface 43. Is also possible.
- the lid portion 32 of the container 30 as shown in FIG. 6, by forming a burring portion 34 around the through hole 33, the rigidity around the through hole 33 in the lid portion 32 is increased. It is also possible to secure the configuration.
- the burring portion 34 is a thick-walled portion provided so as to protrude vertically from the inner side of the container 30 toward the outer side (upward in the drawing) at the periphery of the through hole 33. That is, the burring portion 34 is a protruding portion provided to protrude outward from the outer surface of the lid portion 32, and the through hole 33 is formed by the inner peripheral side surface thereof.
- the burring part 34 is a thick-walled part formed by plastic processing a part of the lid part 32 (around the part where the through-hole 33 is provided). It is appropriately formed by a combination of these. However, as shown in FIG.
- the lower end portion of the side surface facing the through hole 33 in the burring portion 34 is formed to be a right angle in a sectional view by molding using a press die.
- the burring portion 34 protruding from the surface of the lid portion 32 makes it possible to arrange the reinforcing ring 35 around the protruding portion.
- the reinforcing ring 35 is an annular reinforcing member having a shape corresponding to the outer peripheral shape of the burring portion 34, and is a metal member having a strength equal to or higher than the material of the lid portion 32.
- the pressing direction with respect to the electrode terminal 40 is the direction from the outer side to the inner side of the battery 10, but the pressing may be performed from the inner side of the battery 10 as shown in FIG. 8. .
- the battery module 110 which is 2nd embodiment of the battery which concerns on this invention is demonstrated.
- the battery module 110 is an assembled battery configured by connecting batteries of a plurality of cells in series or in parallel.
- the battery module 110 includes a plurality of battery cells 120, 120... And a pair of electrode terminals 140, 140.
- the battery cells 120, 120,... Are battery cells made of secondary batteries such as lithium ion secondary batteries and nickel metal hydride batteries, and are arranged in close contact with each other and connected in series or in parallel.
- the battery cells 120, 120, ... are electrically connected in each container of the adjacent battery cells 120, 120, and the containers of the battery cells 120, 120 located at both ends in the arrangement direction are respectively used as positive terminals.
- the electrode terminal 140 and the electrode terminal 140 as a negative electrode terminal are provided so as to protrude toward the outside of the container. The exchange of power between the inside of the battery module 110 (that is, the battery cells 120, 120...) And the outside is performed via the electrode terminals 140 and 140.
- the electrode terminals 140 and 140 have the same configuration as the electrode terminals 40 and 40 in the first embodiment, and include appropriate press surfaces.
- the electrode terminals 140 and 140 are fixed to through holes 133 and 133 provided in the container of the battery cell 120.
- the fixing method similar to the method demonstrated in 1st embodiment is applicable to the fixing method of this electrode terminal 140 to the through-hole 133.
- FIG. Therefore, also in the battery module 110, as in the case of the battery 10, there is an effect that the sealing performance in the through holes 133 and 133 through which the electrode terminals 140 and 140 pass can be secured.
- the battery pack 210 which is 3rd embodiment of the battery which concerns on this invention is demonstrated.
- the battery pack 210 is an assembled battery in which batteries of a plurality of cells connected in series or in parallel are accommodated in one container.
- the battery pack 210 includes a plurality of battery cells 220, 220..., A container 230 containing the battery cells 220, 220, and a pair of electrode terminals 240 and 240.
- the battery cells 220, 220,... Are battery cells made of secondary batteries such as lithium ion secondary batteries and nickel metal hydride batteries.
- the battery cells 220, 220... are connected in series or in parallel in the container 230, respectively.
- the container 230 is a sealed container that accommodates the battery cells 220, 220,... And is filled with a cooling medium such as oil.
- Electrode terminals 240 and 240 are provided on one surface of the container 230 so as to protrude outward.
- the electrode terminals 240, 240 are electrically connected to the battery cells 220, 220,... Via appropriate lead terminals.
- the exchange of power between the inside of the battery pack 210 (that is, the battery cells 220, 220%) And the outside is performed via the electrode terminals 240 and 240.
- the electrode terminals 240 and 240 have the same configuration as the electrode terminals 40 and 40 of the first embodiment, and include appropriate press surfaces.
- the electrode terminals 240 and 240 are fixed to through holes 233 and 233 provided in the container 230.
- the fixing method similar to the method demonstrated in 1st embodiment is applicable to the fixing method to this through-hole 233 of the electrode terminal 240.
- FIG. Therefore, also in the battery pack 210, as in the case of the battery 10, there is an effect that it is possible to ensure sealing performance in the through holes 233 and 233 of the container 230 through which the electrode terminals 240 and 240 pass.
- the electrode terminals 40, 140, and 240 in the battery 10, the battery module 110, and the battery pack 210 are connected to the battery according to the method for fixing the electrode terminals to the container in the present invention.
- a part of the electrode terminals 40, 140, and 240 is plastically deformed toward the outside (the inner peripheral surface side of the through hole of the battery container), thereby being firmly fixed.
- its application range is not limited to batteries.
- an electrode terminal for taking out electric power from the inside of a metal airtight container is provided through the airtight container, it is also applied to a method of firmly fixing the electrode terminal while securing the airtight structure of the airtight container. it can.
- the present invention can be used for a structure in which the electrode terminal is provided in a state of protruding outward from the sealed container, and is particularly suitable for a technique for ensuring a sealing property in a through hole through which the electrode terminal penetrates the container.
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Abstract
Description
蓋部には一対の貫通孔が設けられ、当該貫通孔からそれぞれ電極端子(正極端子、負極端子)が外方に突出して設けられる。電極端子は、電極体にて発生する電力を外部に取り出すための正極及び負極の外部端子である。
また、容器には厚み方向に連通可能な安全弁等の安全装置が設けられている。例えば、安全弁は、内部短絡等の電池の不具合によって電池内部で大量のガスが発生した場合に作動して、電池内外を連通させることによって内圧上昇を防止する。
また、一般的な電池の容器において、収納部と蓋部とは溶接等によって強固に接合されているため、電極端子と蓋部との固定部において、電極端子が電池から抜け落ちないための抜け落ち性、電極端子の周囲から電池内部の電解液、若しくは電池内部で発生するガスが漏れ出ないためのシール性、及び電極端子と外装容器の絶縁性等が求められている。
すなわち、電池の製造工程において、電極端子を蓋部の貫通孔に固定する際に、当該固定部のシール性を十分に確保する必要がある。
しかしながら、電池の繰り返し使用に伴って冷却・昇温の冷熱サイクルが繰り返されると、膨出部が徐々にかしめ前の形状に戻ろうとする作用が働いて緩み、そのシール性能が悪化するため、電池のシール性が不十分である点で不利である。
30 容器
32 蓋部
33 貫通孔
40 電極端子
43 プレス面
44 膨出部
50 絶縁部材
以下に、図1を参照して、本発明に係る電池の第一実施形態である電池10の概略構成について説明する。
図1に示すように、電池10は、発電要素20を容器30内に収納してなる。容器30から外方に向けて、電極端子40・40が突出して設けられている。
なお、容器30を構成する収納部31及び蓋部32の材料を鉄としているが、これに限定されることはない。本実施形態では、収納部31及び蓋部32の強度の観点から鉄を選択しているが、例えば、鉄の代替として、鉄と同等以上の強度(例えば引張強度100MPa以上)を有する金属であることが好ましいが、アルミニウム等の一般的な電池に用いられる材料でも適用可能である。
電極端子40は、適宜のリード端子等を介して発電要素20の正極又は負極に電気的に接続されており、電極端子40・40を介して電池10内部と外部との電力のやり取りが行われる。つまり、電極端子40・40は、外部との電気接続の経路として用いられる外部端子である。また、電極端子40の外周部の一部には、上記電気接続の際の利便性を考慮してねじ転造によりねじ加工が施されている。
電極端子40・40は、絶縁部材50・50を介して容器30の蓋部32に固定されており、各絶縁部材50によって、電極端子40と容器30との絶縁性が確保されている。また、電極端子40を固定する際に、電極端子40の一部をプレスしてかしめることにより、絶縁部材50及び蓋部32を電極端子40から外側に向けて圧迫して強固に固定している。これにより、蓋部32と電極端子40との間のシール性が確保されている。
貫通孔33・33は、所定の内径を有する孔であり、蓋部32の厚み方向(図示において上下方向)に貫通している。
固定部42の外径は絶縁部材50の内径に応じて設定されており、固定部42の外周部の全周に絶縁部材50が介挿された状態で、電極端子40が蓋部32の貫通孔33に固定される(図4参照)。
また、固定部42は、電極端子40の他端部(電池10の内方側の端部であって、図示における下端部)に設けられる部位であり、蓋部32に固定されるとともに、発電要素20に接続される前記リード端子に接続される略円柱状の部位である。固定部42の軸方向の長さは、蓋部32の厚みよりも十分に大きく設定されるとともに、絶縁部材50の軸方向の長さよりも十分に大きくなるように設定されている。
なお、電極端子40におけるプレス面43は、プレスの際に変形する部位を有するため、係る変形部位については、外部との電気接続等の用途に用いることはない。但し、電極端子40の径が十分に大きい場合は、プレス面43の幅を大きくとることができるため、プレス面43のなかのプレスされない部位を外部との電気接続の際のナット用の座面として用いることも可能である。
絶縁部材50は、固定部42の形態に応じた形状を有する絶縁体であり、本実施形態では円筒形状を有する。絶縁部材50は、固定部42の外周部に巻装されている。
また、絶縁部材50の軸方向の長さは、固定部42の軸方向の長さと同程度又はそれより大きく設定されている。つまり、絶縁部材50の軸方向の長さは、電極端子40を蓋部32に固定した際に、電極端子40の外周部(特に固定部42)と蓋部32の内周部との間に絶縁のために必要十分な間隔が空くように設定されている。
絶縁部材50の材料としては、高温クリープ特性に優れる材料、つまり、電池10の冷熱サイクルに対する長期の耐クリープ性を有する材料が好ましく、例えばPEEK(ポリエーテルエーテルケトン)等が挙げられる。
図4に示すように、電極端子40のプレス面43の外周部は、電池10の外方側(図3における上方)から押圧されることにより全周に亘ってかしめられている(言い換えれば、プレスにより材料が塑性流動している)。
このようにして、膨出部44が固定部42の外周部から(厳密には、プレス面43においてプレスされた部位の下方から)外側に向けて膨出するように形成されている。ここで、膨出部44の外周側には、電極端子40の材料と比較して軟質の材料からなる絶縁部材50が配置されているため、膨出部44は絶縁部材50側に向けて(貫通孔33の内周面に向けて)膨出するように形成される。
このように、電極端子40のプレス面43の外周部を上方からプレスし、かしめることによって、外側に膨出する膨出部44が形成され、膨出部44からの面圧が絶縁部材50を介して蓋部32の貫通孔33の内周面に伝達される。係る面圧によって蓋部32が圧迫されて、容器30の蓋部32に電極端子40が固定される構成である。
このとき、膨出部44の塑性変形及び絶縁部材50の弾性変形により、貫通孔33の内周面、絶縁部材50及び固定部42の間に隙間がなくなり、これらの間に高い密着力が発生するため、容器30の蓋部32と電極端子40との間のシール性が確保され、電池10内の気密性が確保される。また、膨出部44は、プレスする方向と膨出する方向とが約90°の角度を成してかしめられていることにより、膨出部に働く強い面圧や摩擦力によりプレスされた面が容易に戻ることはない(つまり、膨出部44が緩まない)。
このとき、電極端子40と蓋部32とは、プレス後に形成される膨出部44が貫通孔33の内周面と対向するように位置調整された状態で配置されている。
プレス工具60は、内部に電極端子40の一部が通過可能な空間を有する略円筒状の工具であり、先端部にプレス面43の外周部をプレスするプレス刃61を有する。プレス工具60は、適宜の駆動装置により電極端子40に対して近接/離間方向に移動可能に構成されている。
なお、プレス工具60によるプレス時には適宜の治具が用いられ、蓋部32、電極端子40及び絶縁部材50が前記治具によって保持された状態でプレス工具60による押圧が行われるものとする。
また、膨出部44を内側から膨出させることにより、絶縁部材50及び蓋部32が内側から外側へ向けて拡大する方向に変形するため、絶縁部材50及び蓋部32におけるシワの発生を防止でき、密閉信頼性を向上できる。
従って、電池10の内圧が上昇した場合に、電極端子40の周囲(貫通孔33)から蓋部32へ加わる外周方向の外力に対する耐性(耐圧性)を確保でき、電池寿命を向上できる。
また貫通孔33の形状と同様に、プレス面43による段付き構造を有する電極端子40側の形状についても、突出部41の外形を円形状とし、固定部42の外形を上記異形状とすることも可能である。
バーリング部34は、蓋部32の一部(貫通孔33が設けられる部位周辺)を塑性加工して形成される厚肉部位であり、公知のバーリング処理、深絞り法、寄せ肉法等、又はこれらの組み合わせによって適宜形成される。ただし、図6に示すように、バーリング部34における貫通孔33に面する側面の下端部は、プレス金型を用いた成形等により断面視において直角となるように形成される。
このように蓋部32の貫通孔33の周囲にバーリング部34が形成されることによって、電極端子40の周囲に存在する蓋部32の部位を増大することができ、貫通孔33における電極端子40の拘束力を向上することができる。従って、電池10使用時に振動等の外力が加わった場合にも電池10の気密性を確保することができ、電池10の寿命を向上することが可能となる。
補強リング35は、バーリング部34の外周形状に応じた形状を有する円環状の補強部材であり、蓋部32の材料と同等若しくはそれ以上の強度を有する金属製の部材である。このように構成される補強リング35をバーリング部34の周囲に配置することによって、プレス時に膨出部44の膨出方向における蓋部32側の厚みを増大させることができ、バーリング部34の外側への変形を防止し、電極端子40の拘束力を増大するという効果を奏する。このように、貫通孔33におけるシール性をさらに向上することも可能である。
この場合、電極端子40の突出部41側に、外部との電気接続に用いるナット用の座面45を全面に設けることが可能となり、電池10と外部端子間の導電部面積を稼ぐことにより、導電効率を向上できる。
以下では、図9を参照して、本発明に係る電池の第二実施形態である電池モジュール110について説明する。電池モジュール110は、複数セルの電池を直列又は並列に繋ぐことによって構成される組電池である。
電池セル120・120・・・は、リチウムイオン二次電池、ニッケル水素電池等の二次電池からなる電池セルであり、互いに密接した状態で配列され、直列又は並列に接続されている。電池セル120・120・・・の電気的な接続は、隣接する電池セル120・120の各容器内で行われており、配列方向両端に位置する電池セル120・120の容器からそれぞれ正極端子としての電極端子140、負極端子としての電極端子140が容器外方に向けて突出して設けられる。
電池モジュール110内部(つまり、電池セル120・120・・・)と外部との電力のやり取りは、電極端子140・140を介して行われる。
従って、電池モジュール110においても、電池10の場合と同様に、電極端子140・140が貫通する貫通孔133・133におけるシール性を確保できるという効果を奏する。
以下では、図10を参照して、本発明に係る電池の第三実施形態である電池パック210について説明する。電池パック210は、直列又は並列に繋がれた複数セルの電池を一つの容器内に収容してなる組電池である。
電池セル220・220・・・は、リチウムイオン二次電池、ニッケル水素電池等の二次電池からなる電池セルである。電池セル220・220・・・は、容器230内でそれぞれ直列又は並列に接続されている。
容器230は、電池セル220・220・・・を内部に収容する密閉容器であり、その内部に油等の冷却媒体が充填されている。容器230の一面には、電極端子240・240が外方へ向けて突出して設けられる。
電極端子240・240は、適宜のリード端子を介して電池セル220・220・・・と電気的に接続されている。
電池パック210内部(つまり、電池セル220・220・・・)と外部との電力のやり取りは電極端子240・240を介して行われる。
従って、電池パック210においても、電池10の場合と同様に、電極端子240・240が貫通する容器230の貫通孔233・233におけるシール性を確保できるという効果を奏する。
Claims (6)
- 貫通孔を有する容器と、
一部を前記容器の外方へ突出させた状態で前記貫通孔に固定される電極端子と、
前記容器と前記電極端子との間に介装される絶縁部材と、を具備する電池を製造する方法であって、
前記電極端子は、前記容器における貫通孔の貫通方向の端部に、外周部から内側に向けて平坦な面として形成されるプレス面を含み、
前記貫通孔の内側に前記絶縁部材を介して前記電極端子を挿入し、
前記電極端子のプレス面をプレスして、当該電極端子の外周部の一部を前記貫通孔の内周面側に向けて膨出させることにより、前記電極端子を前記貫通孔に固定する電池の製造方法。 - 前記容器の材料は、鉄である請求項1に記載の電池の製造方法。
- 前記容器の貫通孔の周縁に、前記容器の外方へ向けて突出するバーリング部を設ける請求項1又は2に記載の電池の製造方法。
- 貫通孔を有する容器と、
一部を前記容器の外方へ突出させた状態で前記貫通孔に固定される電極端子と、
前記容器と前記電極端子との間に介装される絶縁部材と、を具備し、
前記電極端子は、前記容器における貫通孔の貫通方向の端部に、外周部から内側に向けて平坦な面として形成されるプレス面を含み、
前記貫通孔の内側に前記絶縁部材を介して前記電極端子を挿入し、
前記電極端子のプレス面をプレスして、当該電極端子の外周部の一部を前記貫通孔の内周面側に向けて膨出させることにより、前記電極端子を前記貫通孔に固定する電池。 - 前記容器の材料は、鉄である請求項4に記載の電池。
- 前記貫通孔の周縁に設けられ、前記容器の外方へ向けて突出するバーリング部をさらに具備する請求項4又は5に記載の電池。
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CN201080065409.1A CN102792481B (zh) | 2010-03-23 | 2010-03-23 | 电池的制造方法以及电池 |
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JP2014143153A (ja) * | 2013-01-25 | 2014-08-07 | Toyota Industries Corp | 蓄電モジュール |
CN110970580A (zh) * | 2019-11-04 | 2020-04-07 | 黄凯 | 纽扣电池及其制作方法 |
WO2023157539A1 (ja) * | 2022-02-17 | 2023-08-24 | 株式会社エンビジョンAescジャパン | 電圧検出装置及び電池モジュール |
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US20130011724A1 (en) | 2013-01-10 |
JPWO2011117971A1 (ja) | 2013-07-04 |
CN102792481A (zh) | 2012-11-21 |
JP5494794B2 (ja) | 2014-05-21 |
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