WO2014199513A1 - 二次電池 - Google Patents
二次電池 Download PDFInfo
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- WO2014199513A1 WO2014199513A1 PCT/JP2013/066475 JP2013066475W WO2014199513A1 WO 2014199513 A1 WO2014199513 A1 WO 2014199513A1 JP 2013066475 W JP2013066475 W JP 2013066475W WO 2014199513 A1 WO2014199513 A1 WO 2014199513A1
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- WIPO (PCT)
- Prior art keywords
- exterior body
- terminal
- secondary battery
- power generation
- generation element
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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 of a single cell or a single battery
- 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
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
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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
- H01M50/543—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
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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
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
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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
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
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- 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
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- 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
Definitions
- the present invention relates to a flat secondary battery having a laminate film as an exterior body, and particularly to a structure around a terminal connected to an internal power generation element.
- a power generation element formed by laminating a plurality of positive plates, negative plates, and separators is housed in an inside together with an electrolytic solution.
- a secondary battery is known (for example, Patent Document 1).
- a nickel layer is formed on the surface of a terminal body made of a conductive material such as copper (for example, nickel) as terminals (positive and negative terminals) for taking out current from an internal power generation element to the outside.
- a power generation element or the like is housed in an exterior body and hermetically sealed, the sandwiched portion is sealed and applied.
- a heat-fusible resin layer is formed in advance on the sandwiched portion of the terminal surface (nickel layer surface), and the terminal is sandwiched by the exterior body via the resin layer, and the sandwiched portion is thermally fused.
- the technique to wear is known.
- a method of coating a corrosion resistant layer on the surface of the nickel layer in contact with the electrolyte solution is known. Yes. It is conceivable that a peeling force acts on the sandwiched portion due to the internal pressure in the exterior body.
- An object of the present invention is to provide a secondary battery that improves the reliability of the battery while improving the peel strength between the terminal and the exterior body.
- the present invention is a creation that can solve the above-described problems.
- one aspect of the secondary battery of the present invention is a power generation element formed by laminating a positive electrode plate and a negative electrode plate via a separator, and a metal layer.
- a flat secondary battery having at least an inner surface and a package body in which a power generation element is accommodated and sealed together with an electrolyte solution by a laminate film having a resin layer laminated on the inner surface, and one end portion of the power generation element in the exterior body The terminal is connected and the other end is led out of the exterior body, the terminal is sandwiched between the one end and the other end by the exterior body, and the sandwiched portion is sealed.
- At least the surface side of the terminal is nickel A terminal body composed of: a corrosion-resistant layer coated on the inside of the exterior body from at least the sandwiched portion of the surface of the terminal body; and at least a sandwiched portion of the surface of the corrosion-resistant layer that is coated on the interior of the exterior body.
- the inner extending portion may extend from the sandwiched portion in the range of 0.5 mm to 5 mm in the exterior body inner direction. Further, the exterior body may be sealed with the inside thereof under reduced pressure, and a later-described liquid volume coefficient of the electrolytic solution accommodated therein may be 1.1 to 1.6. Furthermore, the power generation element and the terminal may be joined via a connecting portion interposed between the power generation element and the terminal, and the thickness of the joined portion after joining may be larger than the thickness of the inner extension portion. .
- FIG. 1 The schematic perspective view for demonstrating an example of the secondary battery by this invention.
- the schematic sectional drawing of the secondary battery of FIG. The schematic explanatory drawing which expanded the terminal part of FIG.
- the schematic curve figure which shows the elution amount characteristic of the nickel surface with respect to the thickness of the corrosion-resistant layer of a terminal.
- A) is a prior art
- (b) is a schematic sectional drawing of the secondary battery of FIG. 1 (a corrosion-resistant layer, a nickel surface, etc. are abbreviate
- the secondary battery of FIGS. 1 to 3 is, for example, a lithium ion secondary battery 1 and has a flat rectangular appearance as shown in FIG. 1, and a pair of terminals on one end edge in the longitudinal direction. 2 and 3.
- the lithium ion secondary battery 1 is a battery in which a power generation element 4 having a rectangular shape as viewed from the direction of the arrow X is accommodated in an exterior body 5 together with an electrolytic solution.
- the power generation element 4 includes a plurality of positive plates 41 and negative plates 42 that are alternately stacked with separators 43 interposed therebetween.
- a configuration in which the positive electrode plate 41 is located on the outermost layer of the power generation element 4 is also possible.
- the dimension of each part in FIG. 2 is not necessarily exact, and is exaggerated for explanation.
- the positive electrode plate 41 is obtained by forming positive electrode active material layers 41b and 41c on both surfaces of a positive electrode current collector 41a having a rectangular shape when viewed from the direction of arrow X in FIGS.
- the positive electrode current collector 41a is made of, for example, an electrochemically stable metal foil such as an aluminum foil or an aluminum alloy foil.
- the positive electrode active material layers 41b and 41c are formed of a positive electrode active material containing a lithium composite oxide such as lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ), or lithium cobaltate (LiCoO 2 ).
- the binder is mixed and applied to the main surface of the positive electrode current collector 41a.
- the negative electrode plate 42 is formed by forming negative electrode active material layers 42b and 42c on both surfaces of a negative electrode current collector 42a having a rectangular shape when viewed from the direction of arrow X in FIGS.
- the negative electrode current collector 42a is made of an electrochemically stable metal foil such as a copper foil, a stainless steel foil, or an iron foil.
- the negative electrode active material layers 42b and 42c are, for example, a mixture of a negative electrode active material that occludes and releases lithium ions such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, or graphite. Is applied to the main surface of the negative electrode current collector 42a.
- a part of the edge in the longitudinal direction of the negative electrode current collector 42a extends as an extended portion (corresponding to the connecting portion of the present invention) 40 that does not include the negative electrode active material layers 42b and 42c.
- 40 a is joined to one end 3 a inside the outer package 5 of the negative electrode terminal 3.
- the tips 40a of the respective extensions 40 of the negative electrode current collectors 42a are bundled and joined together.
- the separator 43 has a function of preventing a short circuit between the positive electrode plate 41 and the negative electrode plate 42 and simultaneously holding an electrolyte, and is made of, for example, polyolefin such as polyethylene (PE) or polypropylene (PP). A microporous membrane is used.
- the separator 43 is not limited to a single-layer film such as polyolefin, but may also be a three-layer structure in which a polypropylene film is sandwiched with a polyethylene film, or a laminate of a polyolefin microporous film and an organic nonwoven fabric. .
- the exterior body 5 that houses the power generation element 4 having a structure in which an electrode and a separator are laminated together with an electrolytic solution includes a thermal fusion layer 51, a metal layer 52, and a protective layer 53, as shown in FIG. It is composed of a laminate film having a three-layer structure.
- a thermal fusion layer 51 for example, an aluminum foil is used for the intermediate metal layer 52, and a heat-sealable layer 51 covering the inner side surface is made of a synthetic resin that can be heat-sealed, for example, polypropylene (PP).
- the covering protective layer 53 is made of a synthetic resin having excellent durability, such as polyethylene terephthalate (PET).
- PET polyethylene terephthalate
- a laminate film having a larger number of layers can also be used.
- the synthetic resin layers are laminated on both surfaces of the metal layer 52.
- the synthetic resin layer outside the metal layer 52 is not necessarily essential, and the configuration includes the synthetic resin layer only on the inner surface. It may be.
- the outer package 5 has a two-sheet structure of one laminate film disposed on the lower surface side of the power generation element 4 in FIG. 2 and another laminate film disposed on the upper surface side, The four sides around these two laminate films are superposed and heat-sealed to each other.
- the illustrated example shows the outer package 5 having a two-sheet structure.
- the exterior body 5 uses a relatively large laminate film, and the power generation element 4 is arranged inside in a folded state, and the surrounding three sides are overlapped. And it is the structure which mutually heat-seal
- a pair of terminals 2 and 3 positioned on the short side of the lithium-ion secondary battery 1 having a rectangular shape are arranged at one end portion inside the outer package 5 (one end portion in the case of the negative electrode terminal 3) when the laminate film is heat-sealed.
- 3a) is joined to the extension portions of the current collectors 41a and 42a (the extension portion 40 in the case of the current collector 42a), and the other end portion outside the outer casing 5 (the other end portion in the case of the negative electrode terminal 3).
- 3b) is pulled out through the bonding surface 5a of the laminate film.
- a pair of terminals 2 and 3 are between one end part and the other end part (in the case of the negative electrode terminal 3 between one end part 3a and the other end part 3b) by the bonding surface 5a of the laminate film of the exterior body 5. It is clamped and sealed at the clamped portion 33c.
- the negative electrode terminal 3 includes a terminal body 30 having at least a surface made of nickel and having a nickel surface 31, and at least a sandwiched portion 33 c of the nickel surface 31 of the terminal body 30. 5 a corrosion-resistant layer 32 covering the inner side, and a resin layer 33 that covers at least the sandwiched portion 33c of the surface of the corrosion-resistant layer 32 and has an inner extended portion 33a that extends from the sandwiched portion 33c to the inside of the exterior body 5 Apply the one with.
- the terminal body 30 has the nickel surface 31 as described above, for example, a rectangular conductor can be applied, and nickel plating or nickel plating is applied to the surface of a metal such as copper. What you gave.
- the corrosion resistant layer 32 may be formed by subjecting the nickel surface 31 of the terminal body 30 to a chemical conversion treatment.
- the corrosion-resistant layer 32 prevents the nickel surface 31 from being exposed to the electrolytic solution, and can suppress corrosion due to, for example, hydrogen fluoride.
- the extended part covering surface 3c covered with the inner side extended part 33a among the nickel surfaces 31 deterioration and corrosion, such as discoloration, are suppressed, for example.
- chromate treatment or non-chromium treatment may be used as chromate treatment or non-chromium treatment.
- the corrosion resistant layer 32 may be formed so as to cover all of the nickel surface 31, but the outer surface of the exterior body 5 is not covered outside the nickel surface 31 except for the inner side of the sandwiched portion 33 c. By forming, not only deterioration and corrosion can be suppressed, but also cost reduction can be achieved.
- the thickness of the anticorrosion layer 32 may be in the range of 20 nm to 80 nm in consideration of ensuring a sufficient battery life (about 10 years) when applied to an electric vehicle, for example. Can be mentioned.
- the resin layer 33 has an inner extension portion 33a that covers at least the sandwiching portion 33c of the surface of the corrosion-resistant layer 32 and extends from the sandwiching portion 33c to the inside of the exterior body 5. 5 may be used as long as it can be heat-sealed to the negative electrode terminal 3 (corrosion-resistant layer 32 coated on the nickel surface 31) or the outer package 5 and sealed by the clamping portion 33c. Therefore, the resin layer 33 may be formed with, for example, an extending portion (hereinafter referred to as an outer extending portion) 33b extending from the sandwiching portion 33c to the outside of the exterior body 5.
- an extending portion hereinafter referred to as an outer extending portion
- the resin layer 33 has heat resistance that is not melted and crushed by desired heat (for example, 160 ° C. to 190 ° C.) and pressure (for example, 0.5 to 2.0 MPa) and resistance to the electrolytic solution (electrolytic solution resistance).
- desired heat for example, 160 ° C. to 190 ° C.
- pressure for example, 0.5 to 2.0 MPa
- resistance to the electrolytic solution electrolytic solution resistance
- an acid-modified polyolefin resin is used.
- the acid-modified polyolefin-based resin is one that can be heat-sealed between the negative electrode terminal 3 and the outer package 5, and may be selected and applied as appropriate depending on the type of resin used for the heat-adhesive resin layer. Specific examples thereof include polyolefin resins graft-modified with unsaturated carboxylic acids, copolymers of ethylene or propylene and acrylic acid, or methacrylic acid, or metal-crosslinked polyolefin resins.
- an ethylene-propylene-butene copolymer, an amorphous ethylene-propylene copolymer, a propylene- ⁇ -olefin copolymer, an olefin elastomer or the like may be added at 5% or more.
- the inner extending portion 33a of the resin layer 33 may have a shape extending from the sandwiching portion 33c to the inner side of the exterior body 5.
- the dimension of the exterior body 5 in the resin layer 33 is about 10 mm
- the dimension of the extending portion 33a in the extending direction may be in the range of 0.5 mm to 5 mm.
- the thickness is less than 0.5 mm, sufficient peel strength cannot be obtained as described above.
- less than 0.5 mm for example, when the resin layer 33 is heat-sealed, the position sandwiched by the joining surface of the laminate film is shifted, and the laminate film is caused by a step at the end of the inner extension portion 33a.
- heat fusion heat fusion with a shape reflecting the step shape
- the insulation of the exterior body 5 is deteriorated.
- it exceeds 5 mm the volumetric efficiency of a battery will be reduced.
- the metal layer in the outer package 5 may come into contact with the terminal after heat sealing.
- the pair of terminals 2 and 3 are arranged side by side on the same one edge, but the positive electrode terminal 2 is arranged on one edge, and It is also possible to arrange the negative electrode terminal 3 so as to be located at the other end edge.
- the secondary battery according to the embodiment of the present invention includes an inner extension that covers at least the sandwiched portion of the surface of the corrosion-resistant layer formed on the inner side of the outer package from the sandwiched portion and extends from the sandwiched portion to the inner side of the outer package. It is the structure provided with the resin layer which has an existing part (equivalent to the inner side extension part 33a of FIG. 3). Structure of Patent Document 1 (see reference numeral 306 in FIG. 13 of Patent Document 1) As shown in FIG.
- the nickel surface (corresponding to the nickel surface 31 in FIGS. 2 and 3; hereinafter referred to as nickel surface) constituting at least the surface side of the terminal body 30, it extends from the clamping portion 33 c to the inside of the exterior body and to the inside. Since the surface covered with the existing portion 33a (hereinafter referred to as the extended portion covering surface) 3c is not directly exposed to the electrolytic solution, the anticorrosive layer (the anticorrosive layer in FIGS. 2 and 3). However, in the case where the extended portion covering surface 3c has no corrosion-resistant layer, it is compared with the nickel surface in the portion without the sandwiching portion 33c or the resin layer 33.
- the secondary battery having the configuration as in the present embodiment it is possible to improve the peel strength at the sandwiched portion and to suppress the deterioration of the nickel surface of the terminal and to provide a reliable secondary battery. It is possible to achieve a useful effect.
- electrolyte solution the nonaqueous electrolyte solution in which lithium salt melt
- the ratio of the electrolyte to the total value of the pore volumes of the electrodes 41 and 42 and the separator 43 is more than 1, As an example, setting to be 1.1 to 1.6 may be mentioned.
- the ratio of the electrolytic solution By setting the ratio of the electrolytic solution to 1.1 or more, for example, a gap is formed between the inner extending portion 33a and the laminate film, and a reservoir portion of the electrolytic solution can be formed in the gap. In the case of less than 1.1, the gap between the inner extension portion 33a and the laminate film was reduced, and the result that the corrosion of the nickel surface 31 of the extension portion covering surface 3c was accelerated was obtained.
- the thickness of the joint portion with the negative electrode terminal 3 at the tip portion 40a of the extension portion 40 is made larger than the thickness of the inner extension portion 33a.
- the thickness of the joint portion with the negative electrode terminal 3 at the tip portion 40a of the extension portion 40 is made larger than the thickness of the inner extension portion 33a.
- the plurality of secondary batteries are stacked in a direction orthogonal to the main surface of the outer package 5 (that is, the stacking direction of the positive electrode plate, etc.), put into a can, and the outer package 5
- the electrolyte moves to the periphery of the power generation element 4 (perpendicular to the stacking direction) by the applied pressure.
- the electrolytic solution can be easily supplied between the inner extending portion 33a and the laminate film.
- the manufacturing procedure of the lithium ion secondary battery 1 is as follows. First, the negative electrode plate 42, the separator 43, the positive electrode plate 41, and the separator 43 are sequentially laminated to constitute the power generation element 4, and the resin layer 33 is previously heat-sealed to the extension 40 of the negative electrode current collector 42a of the negative electrode plate 42. The inner end (one end portion 3a) of the negative electrode terminal 3 is joined. Similarly, the inner end (corresponding to one end portion 3a of the negative electrode terminal 3) of the positive electrode terminal 2 to which the resin layer 33 has been heat-sealed in advance is joined to the extended portion 40 of the positive electrode current collector 41a of the positive electrode plate 41. Next, while covering the power generation element 4 with a laminate film, the surrounding four sides (three sides in the case of folding in two) are heat-sealed, leaving a relatively small filling port.
- the inside of the exterior body 5 is filled with an electrolyte through the filling port, the inside of the exterior body 5 is decompressed, and then the filling port is heat-sealed to seal the exterior body 5. Thereby, the lithium ion secondary battery 1 is completed.
- the lithium ion secondary battery 1 as shown in FIG. 1 to FIG. 3 is shown below in accordance with the above-described items (configuration example of secondary battery, example of terminal, example of electrolytic solution, example of manufacturing procedure).
- the positive electrode terminal 2 an aluminum terminal was prepared.
- the negative electrode terminal 3 a rectangular thin plate-shaped copper surface is nickel-plated to form a nickel surface 31, a corrosion resistant layer 32 coated on the nickel surface 31, and a corrosion resistant layer 32.
- a secondary battery having a structure as shown in FIGS. 1 to 3 can be obtained by housing an electrolyte solution containing LiPF 6 and a mixed solvent of ethylene carbonate and diethyl carbonate together with the power generation element 4 in the outer package 5. Created.
- the thickness of the corrosion-resistant layer 32 increases, the nickel elution amount decreases.
- the thickness of the corrosion-resistant layer 32 is set to 20 nm or more, 10 It was confirmed that a lifetime of more than one year could be secured.
- the thickness of the corrosion-resistant layer 32 is preferably set to 80 nm or less.
Abstract
Description
図1~図3の二次電池は、例えばリチウムイオン二次電池1であり、図1に示すように、偏平な長方形の外観形状を有し、長手方向の一方の端縁には一対の端子2,3を備えている。
負極端子3は、例えば図2および図3に示すように、少なくとも表面側がニッケルから成りニッケル面31を有した端子本体30と、端子本体30のニッケル面31のうち少なくとも挟持部分33cよりも外装体5内側を被覆した耐腐食層32と、耐腐食層32の表面のうち少なくとも挟持部分33cを被覆しかつ挟持部分33cから外装体5内側に延在した内側延在部33aを有する樹脂層33と、を備えたものを適用する。
電解液としては、特に限定されるものではないが、リチウムイオン二次電池に一般的に使用される電解質として、例えば、有機溶媒にリチウム塩が溶解した非水電解液を用いることができる。さらに、液状のものに限定されるものではなく、ゲル状電解質等の半固体電解質であっても電解液が端子に触れる可能性のあるものであっても良い。
リチウムイオン二次電池1の製造手順としては、以下の通りである。まず、負極板42、セパレータ43および正極板41、セパレータ43を順次積層して発電要素4を構成し、負極板42の負極集電体42aの延長部40に対し樹脂層33が予め熱融着された負極端子3の内側端(一端部3a)を接合する。同様に、正極板41の正極集電体41aの延長部40に対し樹脂層33が予め熱融着された正極端子2の内側端(負極端子3の一端部3aに相当)を接合する。次に、この発電要素4をラミネートフィルムで覆いながら、比較的小さな充填口を残して周囲の4辺(2つ折りの場合は3辺)を熱融着する。
次に、前述した各項目(二次電池の構成例,端子の一例,電解液の一例,製造手順例)に従って、図1~図3に示したようなリチウムイオン二次電池1を以下に示す条件で作成した。まず、正極端子2はアルミニウムの端子を用意した。負極端子3においては、矩形薄板状の銅の表面をニッケルメッキ処理しニッケル面31を形成して成る端子本体30と、ニッケル面31に被覆形成された耐腐食層32と、耐腐食層32の表面のうち挟持部分33cを被覆しかつ挟持部分33cから外装体5内側に3mm延在した内側延在部33aを有するポリプロピレンから成る樹脂層33と、を備えたものを適用した。外装体5においては、三層構造を有するラミネートフィルムから成るものを適用した。
Claims (4)
- 正極板および負極板をセパレータを介して積層してなる発電要素と、金属層の少なくとも内側表面に樹脂層を積層したラミネートフィルムによって前記発電要素を電解液と共に収容して封止される外装体と、を有する偏平の二次電池であって、
一端部が前記発電要素に連結されると共に他端部が前記外装体の外部に導出され、前記一端部と前記他端部との間で前記外装体によって挟持され当該挟持部分が封着される端子を有し、
前記端子は、少なくとも表面側がニッケルから成る端子本体と、当該端子本体の表面のうち少なくとも挟持部分から前記外装体の内側を被覆した耐腐食層と、当該耐腐食層の表面のうち少なくとも前記挟持部分を被覆しかつ前記挟持部分から前記外装体の内側に延在した内側延在部を有する樹脂層と、を備え、
当該樹脂層と前記外装体の内側表面の樹脂層の熱融着により前記挟持部分が封着されたことを特徴とする二次電池。 - 前記内側延在部は、前記挟持部分から前記外装体の内側方向に0.5mm~5mmの範囲で延在したことを特徴とする請求項1記載の二次電池。
- 前記外装体は、内部を減圧下で封止され、かつ前記電解液の液量係数が1.1~1.6であることを特徴とする請求項1または請求項2記載の二次電池。
- 前記発電要素と前記端子は、前記発電要素と前記端子との間に介在する連結部を介して接合され、接合後の接合部分の厚さが前記内側延在部の厚さよりも大きいことを特徴とする請求項1記載の二次電池。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015522369A JP6177908B2 (ja) | 2013-06-14 | 2013-06-14 | 二次電池 |
CN201380077297.5A CN105283978B (zh) | 2013-06-14 | 2013-06-14 | 二次电池 |
KR1020157035017A KR101797338B1 (ko) | 2013-06-14 | 2013-06-14 | 2차 전지 |
EP13886955.7A EP3010069B1 (en) | 2013-06-14 | 2013-06-14 | Secondary battery |
US14/896,003 US9698408B2 (en) | 2013-06-14 | 2013-06-14 | Secondary battery |
PCT/JP2013/066475 WO2014199513A1 (ja) | 2013-06-14 | 2013-06-14 | 二次電池 |
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US (1) | US9698408B2 (ja) |
EP (1) | EP3010069B1 (ja) |
JP (1) | JP6177908B2 (ja) |
KR (1) | KR101797338B1 (ja) |
CN (1) | CN105283978B (ja) |
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JP2016184494A (ja) * | 2015-03-26 | 2016-10-20 | Jx金属株式会社 | フィルム外装電池用タブリード材料及びその製造方法 |
JP2017021889A (ja) * | 2015-07-07 | 2017-01-26 | オートモーティブエナジーサプライ株式会社 | 二次電池の製造方法および製造装置 |
JP2017224494A (ja) * | 2016-06-15 | 2017-12-21 | エリーパワー株式会社 | タブリードの製造方法及びタブリードを用いた電池の製造方法 |
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US10680228B2 (en) | 2017-09-12 | 2020-06-09 | Chongqing Jinkang New Energy Vehicle Co., Ltd. | Electric vehicle battery current collector |
JP7029922B2 (ja) * | 2017-10-10 | 2022-03-04 | 日産自動車株式会社 | 非水電解質二次電池用電極の製造方法 |
JP7145600B2 (ja) * | 2017-10-10 | 2022-10-03 | 日産自動車株式会社 | 非水電解質二次電池用電極 |
JP7133301B2 (ja) * | 2017-10-10 | 2022-09-08 | 日産自動車株式会社 | 非水電解質二次電池用電極 |
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Also Published As
Publication number | Publication date |
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KR101797338B1 (ko) | 2017-11-13 |
US20160133910A1 (en) | 2016-05-12 |
CN105283978B (zh) | 2017-08-29 |
US9698408B2 (en) | 2017-07-04 |
JPWO2014199513A1 (ja) | 2017-02-23 |
EP3010069B1 (en) | 2018-11-07 |
EP3010069A4 (en) | 2016-05-11 |
EP3010069A1 (en) | 2016-04-20 |
KR20160010501A (ko) | 2016-01-27 |
JP6177908B2 (ja) | 2017-08-09 |
CN105283978A (zh) | 2016-01-27 |
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