JP6807149B2 - ラミネート型蓄電素子 - Google Patents
ラミネート型蓄電素子 Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims description 69
- 239000000463 material Substances 0.000 claims description 15
- 239000010410 layer Substances 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 13
- 239000012790 adhesive layer Substances 0.000 claims description 12
- 239000008151 electrolyte solution Substances 0.000 claims description 7
- 239000005001 laminate film Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 22
- 229910052744 lithium Inorganic materials 0.000 description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 230000037303 wrinkles Effects 0.000 description 10
- 239000011888 foil Substances 0.000 description 9
- 238000005452 bending Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000007774 positive electrode material Substances 0.000 description 8
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000002788 crimping Methods 0.000 description 3
- 150000002641 lithium Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000005518 polymer electrolyte Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Description
前記セパレーターはイオン透過性を有する基材の表裏にイオン透過性を有する接着層が積層されてなり、
前記接着層が、前記正極および前記負極との平面領域にて溶着され、
前記外装体は、矩形平面形状を有して対面する二枚のステンレスラミネートフィルムからなり、
前記ステンレスラミネートフィルムは、前記外装体の内面側となる面に溶着層が形成され、
二枚の前記ステンレスラミネートフィルムの前記溶着層は、前記外装体の周縁部において互いに溶着されているとともに、前記電極体と対面して接触する面において当該電極体に溶着されている、
ことを特徴とするラミネート型蓄電素子としている。
<構造>
本発明の実施例に係るラミネート型蓄電素子としてラミネート型のリチウム一次電池を挙げる。図2は本発明の実施例に係るラミネート型蓄電素子(以下、蓄電素子101とも言う)の構造を示した。図2(A)は当該蓄電素子101の内部構造を示す分解斜視図であり、図2(B)は蓄電素子101を構成するセパレーター140の構造を示す図で、図2(A)におけるa−a矢視断面に対応している。図2(A)に示したように、蓄電素子101は図1(B)に示した従来のラミネート型蓄電素子1と同様の構造と構成を有している。しかし外装体111の基材としてステンレス薄板を用いたステンレスラミネートフィルム(111a、111b)を用いている点が異なっている。またステンレスラミネートフィルム(111a、111b)における上述した「皺」の発生を防止するために図2(B)に示したように、セパレーター140が基材141の表裏両面に樹脂からなる接着層142が形成された構造を有している。もちろん基材141と接着層142は共にイオン透過性を有している。本実施例ではシート状のポリエチレンからなる基材の表裏両面にポリフッ化ビニリデン(PVdF)が塗布されたセパレーター140を用いている。なお電極体110におけるセパレーター140以外の構成については図1に示した従来のラミネート型蓄電素子1と共通であり、この共通部分の構成や外形寸法については、例えば上記非特許文献1に記載されている市販品の薄型リチウム電池(例えば、CF052039型)と実質的に同じである。なお実施例に係る蓄電素子では、外装体111とセパレーター140の構造の違いに起因して製造手順が従来とは若干異なっている。
ここで蓄電素子101の具体的な製造手順について説明すると、電極体110を構成する正極20は、正極活物質となる電解二酸化マンガン(EMD)、導電助剤であるカーボンブラック、およびフッ素系バインダーを、93wt%、3wt%、および4wt%の割合で混合したものを純水を用いてスラリー状にした正極材料22をアルミ箔からなる正極集電体21上に塗布して乾燥させたものである。そして負極30は、箔状の負極リチウム31に銅箔からなる負極集電体32を圧着させたものである。そしてこれら正極と負極を正極材料と負極リチウムが対面するようにセパレーターを介して積層して圧着することで電極体110を形成する。
つぎに上述した実施例に係る蓄電素子101について、ICカードなどに組み込まれるなどして使用される状況を再現し、外装体111に皺が発生するか否かを調べた。ここでは識別カードの信頼性試験方法を規定したISO/IEC 10373-1(JIS X 6305)に準拠した手順で、蓄電素子101を500回屈曲させる曲げ試験を行った。そして曲げ試験後の外装体111の状態を目視により確認した。また外装体111の耐腐食性能を調べるために、蓄電素子101を60℃90%RHの条件下で10日間放置する信頼性試験も行った。さらに実施例に係る蓄電素子101に対する比較例として、従来のラミネート型蓄電素子と同様に接着層を有しないポリエチレンのみからなるセパレーターとステンレスラミネートフィルムとを用いて上記と同様の手順で作製した蓄電素子(比較例A)と、実施例に係る蓄電素子101に対して外装体のみをアルミラミネートフィルムに置換し上記と同様の手順で作製した蓄電素子(比較例B)を用意し、比較例Aおよび比較例Bに対しても上記の曲げ試験と信頼性試験を行った。なお各試験を行う毎にそれぞれの蓄電素子を100個ずつ用意した。
本発明に係るラミネート型蓄電素子の構造は、上記実施例に限らない。例えば正極の構造を上記実施例に替えて、例えば集電体をエキスパンドメタルなどで構成し、その集電体の表裏両面に正極材料を塗布した構造とすることもできる。もちろん本発明は、蓄電素子の種類はラミネート型のリチウム一次電池に限らず、様々な種類のラミネート型蓄電素子(リチウム二次電池、電気二重層コンデンサーなど)に適用することができる。
11a,11b,111a,111b ラミネートフィルム、20 正極、
21 正極集電体、22 正極材料、23 正極端子板、30 負極、
31 負極集電体、32 負極材料(負極リチウム)、32 負極端子板、
40,140 セパレーター、141 セパレーターの基材、
142 セパレーターの接着層、12 ラミネートフィルムの周縁
Claims (3)
- 外装体内に、シート状の正極と負極がセパレーターを介して積層されてなる電極体が電解液とともに収納されてなるラミネート型蓄電素子であって、
前記セパレーターはイオン透過性を有する基材の表裏にイオン透過性を有する接着層が積層されてなり、
前記接着層が、前記正極および前記負極との平面領域にて溶着され、
前記外装体は、矩形平面形状を有して対面する二枚のステンレスラミネートフィルムからなり、
前記ステンレスラミネートフィルムは、前記外装体の内面側となる面に溶着層が形成され、
二枚の前記ステンレスラミネートフィルムの前記溶着層は、前記外装体の周縁部において互いに溶着されているとともに、前記電極体と対面して接触する面において当該電極体に溶着されている、
ことを特徴とするラミネート型蓄電素子。 - 請求項1において、前記セパレーターはポリエチレンフィルムを基材として、当該基材の表裏両面にポリフッ化ビニリデンからなる接着層が形成されてなることを特徴とするラミネート型蓄電素子。
- 請求項1または2において、前記電極体はシート状の正極と負極を一つずつ備えた1層分の電極体を備え、枚葉状の情報記録媒体あるいは電子機器に組み込まれることを特徴とするラミネート型蓄電素子。
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