WO2012086031A1 - 電池 - Google Patents
電池 Download PDFInfo
- Publication number
- WO2012086031A1 WO2012086031A1 PCT/JP2010/073171 JP2010073171W WO2012086031A1 WO 2012086031 A1 WO2012086031 A1 WO 2012086031A1 JP 2010073171 W JP2010073171 W JP 2010073171W WO 2012086031 A1 WO2012086031 A1 WO 2012086031A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- external terminal
- exterior
- protrusion
- battery
- burring
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 8
- 238000010248 power generation Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000009751 slip forming Methods 0.000 claims 1
- 239000004033 plastic Substances 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 241000135309 Processus Species 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000003792 electrolyte 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- 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
- H01M50/564—Terminals characterised by their manufacturing process
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a battery, and more particularly to a technique for fixing an external terminal to an exterior.
- the battery exterior houses the power generation elements of the battery.
- External terminals a positive electrode terminal and a negative electrode terminal
- the external terminal is electrically connected to the power generation element, and power is exchanged between the inside and outside of the battery through the external terminal.
- the battery is a non-aqueous electrolyte battery such as a lithium ion secondary battery
- battery performance is affected when moisture enters the battery. For this reason, it is necessary to make the sealing degree of a battery sufficiently high.
- the external terminal and the exterior fixing part the external terminal does not fall out from the battery, and the electrolyte inside the battery or the gas generated inside the battery does not leak from the periphery of the external terminal.
- insulation between the external terminal and the exterior is required. That is, there is a demand for ensuring a sufficient sealing property between the exterior and the external terminal.
- Patent Document 1 in a battery in which an external terminal protrudes from an outer lid portion, an insulating member is interposed between the lid portion and the external terminal, and a burring portion is provided around the insulating member in the lid portion.
- a technique for fastening and fixing an external terminal by pressing and crimping the burring portion from a direction orthogonal to the protruding direction of the burring portion is disclosed.
- the caulking fastening part gradually loosens due to the action of trying to return to the shape before caulking, the sealing performance deteriorates, and the exterior and The sealing performance of the fixed part of the external terminal may be insufficient.
- An object of the present invention is to provide a battery excellent in sealing performance at a fixing portion between an exterior and an external terminal in a battery that fixes the external terminal in a state of penetrating the exterior and protruding outward.
- the battery of the present invention includes an exterior having a through-hole, an external terminal fixed to the through-hole of the exterior in a state in which a part projects outward from the exterior, and an interposition between the exterior and the external terminal.
- a reinforcing member that reinforces, presses the burring portion to cause plastic deformation, and generates a compression force between the external terminal and the through hole by a part of the plastically deformed burring portion.
- the external terminal is fixed to the through-hole by the external terminal, and the external terminal is formed on the outer side of the exterior from the portion that receives the pressing force by the press on the burring portion, and from the outer peripheral surface of the external terminal. Also radially outward Comprising the output projections.
- the external terminal further includes an airtight groove formed at a location that receives a pressing force applied to the burring portion, and the protrusion is disposed on the outer side of the exterior of the airtight groove, and the protrusion
- the projection and the second projection are preferably formed continuously from the end of the airtight groove.
- the battery 10 of this embodiment is a lithium ion secondary battery.
- the battery 10 includes a power generation element 20, an exterior 30 that houses the power generation element 20, external terminals 40 and 40 that protrude outward from the exterior 30, and between the external terminals 40 and 40 and the exterior 30. Insulating members 50 and 50 interposed.
- the power generation element 20 is obtained by impregnating an electrolytic solution into an electrode body formed by laminating or winding a positive electrode, a negative electrode, and a separator.
- an electrolytic solution is obtained by impregnating an electrolytic solution into an electrode body formed by laminating or winding a positive electrode, a negative electrode, and a separator.
- 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), thereby generating a current flow.
- the exterior 30 is a square can having a storage portion 31 and a 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.
- the external terminals 40 and 40 are arranged in a state where a part of the external terminals 40 protrudes outward from the battery 10 from the outer surface of the lid portion 32.
- the external terminals 40 and 40 are electrically connected to the positive electrode or the negative electrode of the power generation element 20 via current collecting terminals 45 and 45.
- the external terminals 40 and 40 and the current collecting terminals 45 and 45 function as an energization path for taking out the electric power stored in the power generation element 20 to the outside or taking in electric power from the outside into the power generation element 20.
- Each current collecting terminal 45 is connected to the positive electrode plate and the negative electrode plate of the power generation element 20.
- As the material of the current collecting terminal 45 for example, aluminum can be used on the positive electrode side and copper on the negative electrode side.
- the external terminal 40 is threaded by thread rolling at a portion protruding outward of the battery 10 to form a bolt portion.
- a bus bar, a connection terminal of an external device, and the like are fastened and fixed to the external terminal 40 using the bolt portion.
- a high-strength material such as iron as the material of the external terminal 40.
- the external terminals 40 and 40 are fixed to the lid portion 32 through insulating members 50 and 50.
- the insulating member 50 is wound around the external terminal 40 to electrically insulate the exterior 30 from the external terminal 40.
- 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 thermal cycle of the battery 10, such as PEEK (polyether ether ketone), PPS (polyphenylene sulfide), etc. Is mentioned.
- packing 30 and the external terminal 40 is demonstrated.
- the exterior 30 has through-holes 33 and 33 through which the external terminals 40 and 40 can penetrate, and a burring portion that protrudes toward the outside of the exterior 30 around each through-hole 33. 34 is formed.
- the through hole 33 is a hole having a predetermined inner diameter, and penetrates in the thickness direction of the exterior 30.
- the burring part 34 is a thick-walled part that protrudes vertically from the inner side to the outer side of the exterior 30 at the periphery of the through-hole 33.
- the burring part 34 is a thick portion formed by plastic processing a part of the exterior 30 and is appropriately formed by a known burring process, a deep drawing method, a close-up method, or a combination thereof.
- a reinforcing ring 35 is fitted to the outer peripheral portion of the burring portion 34.
- the reinforcing ring 35 is a ring-shaped member formed of a metal material (for example, iron) having a strength higher than that of the material constituting the exterior 30 (the lid portion 32), and has a strength against an external force applied in the radial direction of the burring portion 34. It is the reinforcement member to reinforce.
- the inner diameter of the reinforcing ring 35 is formed substantially the same as the outer diameter of the burring portion 34.
- the insulating member 50 also functions as a member for ensuring airtightness inside the battery 10 in addition to the insulating property for insulating the exterior 30 and the external terminal 40.
- the external terminal 40 around which the insulating member 50 is wound is disposed in the through hole 33, and the inner peripheral portion of the protruding side end surface of the burring portion 34 is pressed. By crimping, a bulging portion 34 a bulging from the inner peripheral side surface of the burring portion 34 toward the radially inner side is formed.
- the reinforcing ring 35 made of a material stronger than the burring portion 34 is disposed on the outer peripheral side of the burring portion 34, thereby preventing the pressing force during caulking from being relaxed to the outside. Therefore, the bulging portion 34a bulges toward the inner side (external terminal 40 side).
- the bulging portion 34 a bulging inwardly presses the insulating member 50, and this pressing force is applied as a surface pressure to the insulating member 50.
- a portion of the insulating member 50 to which the surface pressure is applied by the bulging portion 34 a is elastically deformed inward, and an external force generated by the elastic deformation is applied as a surface pressure to the external terminal 40.
- the inner peripheral portion of the end surface of the burring portion 34 is pressed from above and caulked to form a bulging portion 34a that bulges inward, and the surface pressure from the bulging portion 34a causes the insulating member 50 to And transmitted to the external terminal 40.
- the external terminal 40 is pressed by the surface pressure and fixed to the through hole 33 of the lid portion 32.
- the bulging portion 34a is plastically deformed in a direction orthogonal to the pressing direction and fastens and fixes the insulating member 50 and the external terminal 40, the space between the exterior 30, the insulating member 50, and the external terminal 40 is fixed. It is possible to apply a strong surface pressure and frictional force. Therefore, even if it receives the cooling / heating cycle at the time of using the battery 10, the bulging part 34a is hard to deform
- An airtight groove 41 is formed at a location where the external terminal 40 receives a pressing force by pressing the burring portion 34.
- the airtight groove 41 is a semicircular groove (or a shape having an edge line at the groove end, such as a semi-elliptical shape) formed along the circumferential direction of the external terminal 40 along the entire outer periphery thereof.
- the groove width is as follows. As the insulating member 50 is elastically deformed as described above and enters the airtight groove 41 of the external terminal 40 and bites into the edge line of the airtight groove 41, the insulating member 50 and the external terminal 40 are firmly adhered, Airtightness is ensured.
- the lower end of the press and the outer end of the airtight groove 41 are set at substantially the same position when pressing the end face of the burring portion 34, thereby reducing the amount of plastic deformation of the bulging portion 34 a.
- the edge line of the airtight groove 41 is positioned at the largest position, and the degree of adhesion between the insulating member 50 and the external terminal 40 can be improved efficiently.
- the external terminal 40 includes a protrusion 42.
- the protrusion 42 is provided so as to protrude radially outward from the outer peripheral surface of the external terminal 40.
- the protrusion 42 is located above the upper edge line of the airtight groove 41 that is a seal point at the fixing portion between the external terminal 40 and the exterior 30, in other words, a portion that receives a pressing force by pressing the burring portion 34 (press lower end). It is formed above.
- the protrusion 42 is a convex portion having a semicircular cross section, and is formed over the entire outer periphery of the external terminal 40.
- the protrusion 42 is provided above the airtight groove 41 and continuously provided upward from the upper edge line of the airtight groove 41.
- the protrusion 42 is formed as a semicircular convex portion located above the airtight groove 41 that is a seal point between the external terminal 40 and the insulating member 50, and at least the inside of the airtight groove 41. It has a surface (the lower surface in the figure) that faces (the inner side of the exterior 30).
- the cross-sectional shape of the protrusion 42 is not limited to the semicircular shape as described above, and may be a shape having a surface facing the inner side of the exterior 30.
- the lower surface as shown in FIG. May be a triangular shape with a horizontal plane, a quadrangular shape as shown in FIG.
- the upper surface and the lower surface of the protrusion 42 are formed as concave curved surfaces, and the lower surface of the protrusion 42 is provided so as to be smoothly connected to the upper end of the airtight groove 41.
- the protrusion 42 is preferably formed at the end of the airtight groove 41 at the same time when the airtight groove 41 is formed by pressing a roller or the like.
- the current collecting terminal 45 includes a flat plate portion 46.
- the flat plate portion 46 is a flat portion formed at the upper end of the current collecting terminal 45, and is a joint portion that is joined to the lower end of the external terminal 40.
- the flat plate portion 46 extends outward in the radial direction from the lower end of the external terminal 40, and further extends beyond the inner peripheral side surface of the through hole 33. Accordingly, when the current collecting terminal 45 is mounted on the external terminal 40 and fixed to the through hole 33, the protrusion 42 and the flat plate portion 46 form the inner peripheral surface of the insulating member 50, that is, the insulating member 50 and the external terminal 40. Will be sandwiched between the contact surfaces.
- the external terminal 40 preferably includes a protrusion 43 in addition to the protrusion 42.
- the protrusion 43 is provided to protrude radially outward from the outer peripheral surface of the external terminal 40.
- the protrusion 43 is formed below the lower end of the airtight groove 41, which is a seal point at the fixing portion between the external terminal 40 and the exterior 30.
- the protrusion 43 is a convex portion having a semicircular cross section, and is formed over the entire outer periphery of the external terminal 40.
- the protrusion 43 is provided below the airtight groove 41 and is continuously provided downward from the lower edge line of the airtight groove 41.
- the shape of the protrusion 43 is not limited to a semicircular shape like the shape of the protrusion 42, and the surface (the upper surface in the drawing) facing the inner side of the airtight groove 41 (the outer side of the exterior 30) is not limited. Any shape may be used.
- the protrusion 43 may be configured in the same manner as each shape of the protrusion 42 shown in FIG.
- the protrusion 42 positioned above the airtight groove 41 and the protrusion 43 positioned below the airtight groove 41 sandwich the insulating member 50 at the seal point, so that the external terminal 40 is axially or radially aligned.
- the upward flow of the insulating member 50 can be suppressed by the lower surface of the protrusion 42, and the downward flow of the insulating member 50 can be suppressed by the upper surface of the protrusion 43 (FIGS. 9A and 9). (See (b)).
- the flow of the insulating member 50 located at the seal point can be more reliably regulated, it is advantageous for improving the sealing performance at the fixing portion between the exterior 30 and the external terminal 40.
- the external terminal 40 includes a protrusion 42 and a protrusion 43, and the insulating member 50 present at the seal point can be sandwiched between the protrusion 42 and the flat plate portion 46 of the protrusion 43 and the current collecting terminal 45. More preferred. By configuring in this way, there are an operational effect by providing the projection 42, an operational effect by providing the projection 43, and an operational effect by providing the flat plate portion 46 of the current collecting terminal 45.
- the present invention can be used for a battery in which an external terminal is taken out from the outer surface of the exterior, and is particularly suitable for a technique for improving the sealing performance at a fixing portion between the external terminal and the exterior.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
さらに、外部端子と外装の固定部においては、外部端子が電池から抜け落ちないための抜け落ち性、外部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気密性、並びに外部端子と外装の絶縁性等が求められている。すなわち、外装と外部端子の間のシール性を十分に確保する要請がある。
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、かしめ締結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、シール性能が悪化して、外装と外部端子の固定部のシール性が不十分となる場合がある。
電池10は、発電要素20と、発電要素20を内部に収納する外装30と、外装30から外方に向けて突出する外部端子40・40と、外部端子40・40と外装30との間に介装される絶縁部材50・50と、を具備する。
各集電端子45は、発電要素20の正極板、負極板と接続されている。集電端子45の材料としては、例えば正極側にアルミニウム、負極側に銅を採用できる。
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)、PPS(ポリフェニレンスルファイド)等が挙げられる。
図2(a)に示すように、外装30は、外部端子40・40が貫通可能な貫通孔33・33を有し、各貫通孔33の周囲に外装30の外側に向けて突出するバーリング部34が形成される。
バーリング部34は、貫通孔33の周縁に、外装30の内側から外側へ向けて垂直に突出して設けられる厚肉部位である。バーリング部34は、外装30の一部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。
補強リング35は、外装30(蓋部32)を構成する材料よりも高強度の金属材料(例えば鉄)で成形されたリング状の部材であり、バーリング部34の径方向にかかる外力に対する強度を補強する補強部材である。補強リング35の内径は、バーリング部34の外径と略同一に形成される。
具体的には、図2(b)に示すように、貫通孔33内に絶縁部材50を巻装した外部端子40を配置し、バーリング部34の突出側端面の内周部を押圧してかしめることによって、バーリング部34の内周側面から径方向内側に向けて膨出する膨出部34aが形成されている。
このとき、バーリング部34の外周側には、バーリング部34よりも高強度の材料からなる補強リング35が配置されていることによって、かしめ時の押圧力が外側に緩和されることが防止されるため、膨出部34aは内側(外部端子40側)に向けて膨出する。
このように、バーリング部34の端面の内周部を上方からプレスし、かしめることによって、内側に膨出する膨出部34aが形成され、膨出部34aからの面圧が絶縁部材50を介して外部端子40に伝達される。係る面圧によって外部端子40が圧迫されて、蓋部32の貫通孔33に固定される。
このとき、膨出部34aは、プレス方向に対して直交する方向に塑性変形し、絶縁部材50と外部端子40とを締結固定しているため、外装30、絶縁部材50、及び外部端子40間に強い面圧及び摩擦力を付与することが可能である。従って、電池10を使用する際の冷熱サイクルを受けても、膨出部34aは変形し難く、固定部が緩むことがない。
絶縁部材50が上記のように弾性変形し、外部端子40の気密溝41内に入り込むとともに、気密溝41のエッジラインに食い付くことによって、絶縁部材50と外部端子40とが強固に密着し、気密性が確保される。
なお、バーリング部34の端面に対するプレス時に、プレス下端と気密溝41の外方側端部とが略同じ位置になるように設定することが好ましく、これにより、膨出部34aの塑性変形量が最も大きい位置に気密溝41のエッジラインが位置することになり、絶縁部材50と外部端子40との密着度を効率良く向上できる。
突起42は、半円形断面を有する凸部であり、外部端子40の外周全周に亘って形成される。突起42は、気密溝41の上方に設けられ、気密溝41の上方側エッジラインから上方に連続的に設けられている。
電池10の実使用時には、ボルト締結によって外部端子40に外部装置との接続端子が取り付けられる。このようにボルトを締結する際、外部端子40のボルト部に締結トルク及び軸力が発生し、特に軸方向に向けて大きな外力が加わる。これに対して、本実施形態では、外部端子40に突起42を設けることによって、外部端子40に付与される外力を受けて外方側へ変形しようとする絶縁部材50の流出を防止している。
突起42を以上のような形状とすることで、突起42を簡易に形成できるとともに、気密溝41及びその上方に突起42を有する外部端子40を製造するコストを低減できる。
これにより、外部端子40に集電端子45を装着して、貫通孔33に固定したときに、突起42と平板部46とで絶縁部材50の内周面、つまり絶縁部材50と外部端子40との接触面を挟み込むこととなる。
従って、シールポイントに保持される絶縁部材50の量を十分に確保することができ、シール性を担保できる。
突起43は、半円形断面を有する凸部であり、外部端子40の外周全周に亘って形成される。突起43は、気密溝41の下方に設けられ、気密溝41の下方側エッジラインから下方に連続的に設けられている。なお、突起43の形状については、突起42の形状と同様に半円形状に限定されるものではなく、気密溝41の内側(外装30の外方側)に向けた面(図示における上面)を有する形状であれば良い。例えば、突起43を図6に示す突起42の各形状と同様に構成しても良い。
このように、シールポイントに位置する絶縁部材50の流動をより確実に規制することができるため、外装30と外部端子40との固定部におけるシール性の向上に有利である。
このように構成することによって、突起42を設けることによる作用効果、突起43を設けることによる作用効果、並びに、集電端子45の平板部46を設けることによる作用効果を奏する。
30 外装
40 外部端子
42 突起
43 突起(第二の突起)
45 集電端子
46 平板部
50 絶縁部材
Claims (4)
- 貫通孔を有する外装と、
一部を前記外装の外方へ突出させた状態で前記外装の貫通孔に固定される外部端子と、
前記外装と外部端子の間に介装される絶縁部材と、
前記外装の貫通孔の周縁に位置し、当該外装の外方へ向けて突出するバーリング部と、
前記バーリング部の外周に配置され、当該バーリング部の外周側への強度を補強する補強部材と、を具備し、
前記バーリング部をプレスして塑性変形させて、当該塑性変形されたバーリング部の一部により前記外部端子と前記貫通孔との間に圧迫力を発生させることによって外部端子を貫通孔に固定する電池であって、
前記外部端子は、前記バーリング部へのプレスによる圧迫力を受ける箇所よりも前記外装の外方側に形成され、当該外部端子の外周面よりも径方向外側に突出する突起を具備する電池。 - 前記外部端子は、前記バーリング部へのプレスによる圧迫力を受ける箇所に形成される気密溝をさらに具備し、前記突起は、前記気密溝よりも外装の外方側に配置されるとともに、
前記突起に加えて、前記気密溝よりも外装の内方側に形成され、当該外部端子の外周面よりも径方向外側に突出する第二の突起を具備する請求項1に記載の電池。 - 前記突起及び第二の突起は、前記気密溝の端部から連続的に形成される請求項2に記載の電池。
- 前記外装に収納される発電要素と前記外部端子を接続する集電端子をさらに具備し、
前記集電端子は、前記外部端子の端部と接合されるとともに、前記外部端子の外周面を越えて延出され、
前記突起又は第二の突起と前記集電端子とで、前記絶縁部材の内周部を挟む請求項1~3の何れか一項に記載の電池。
Priority Applications (5)
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PCT/JP2010/073171 WO2012086031A1 (ja) | 2010-12-22 | 2010-12-22 | 電池 |
US13/995,628 US20130273418A1 (en) | 2010-12-22 | 2010-12-22 | Battery |
JP2012549530A JPWO2012086031A1 (ja) | 2010-12-22 | 2010-12-22 | 電池 |
KR1020137018412A KR101432461B1 (ko) | 2010-12-22 | 2010-12-22 | 전지 |
CN2010800707934A CN103262294A (zh) | 2010-12-22 | 2010-12-22 | 电池 |
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PCT/JP2010/073171 WO2012086031A1 (ja) | 2010-12-22 | 2010-12-22 | 電池 |
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US (1) | US20130273418A1 (ja) |
JP (1) | JPWO2012086031A1 (ja) |
KR (1) | KR101432461B1 (ja) |
CN (1) | CN103262294A (ja) |
WO (1) | WO2012086031A1 (ja) |
Cited By (2)
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WO2014002819A1 (ja) * | 2012-06-29 | 2014-01-03 | トヨタ自動車株式会社 | 電池 |
JP2017027934A (ja) * | 2015-07-15 | 2017-02-02 | パナソニックIpマネジメント株式会社 | 電池収容体、および、蓄電デバイス |
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JP6115084B2 (ja) * | 2011-11-29 | 2017-04-19 | 株式会社Gsユアサ | 蓄電素子 |
KR102408823B1 (ko) | 2015-08-27 | 2022-06-13 | 삼성에스디아이 주식회사 | 이차 전지 |
CN105870377A (zh) * | 2016-06-13 | 2016-08-17 | 重庆长安汽车股份有限公司 | 一种电池箱体和一种动力电池系统 |
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- 2010-12-22 KR KR1020137018412A patent/KR101432461B1/ko active IP Right Grant
- 2010-12-22 JP JP2012549530A patent/JPWO2012086031A1/ja active Pending
- 2010-12-22 WO PCT/JP2010/073171 patent/WO2012086031A1/ja active Application Filing
- 2010-12-22 CN CN2010800707934A patent/CN103262294A/zh active Pending
- 2010-12-22 US US13/995,628 patent/US20130273418A1/en not_active Abandoned
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JP2001210284A (ja) * | 2000-01-24 | 2001-08-03 | Nec Mobile Energy Kk | 密閉型電池 |
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CN104412413A (zh) * | 2012-06-29 | 2015-03-11 | 丰田自动车株式会社 | 电池 |
JPWO2014002819A1 (ja) * | 2012-06-29 | 2016-05-30 | トヨタ自動車株式会社 | 電池 |
KR101682286B1 (ko) * | 2012-06-29 | 2016-12-05 | 도요타지도샤가부시키가이샤 | 전지 |
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JP2017027934A (ja) * | 2015-07-15 | 2017-02-02 | パナソニックIpマネジメント株式会社 | 電池収容体、および、蓄電デバイス |
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JPWO2012086031A1 (ja) | 2014-05-22 |
KR20130105703A (ko) | 2013-09-25 |
CN103262294A (zh) | 2013-08-21 |
KR101432461B1 (ko) | 2014-08-20 |
US20130273418A1 (en) | 2013-10-17 |
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