JPWO2020017237A1 - 円筒形電池及び電池モジュール - Google Patents
円筒形電池及び電池モジュール Download PDFInfo
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- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
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- H—ELECTRICITY
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- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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- H—ELECTRICITY
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- 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
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
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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
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- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
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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
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
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- H01M50/10—Primary casings; Jackets or wrappings
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
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- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
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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
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Abstract
Description
[正極の作製]
正極活物質として、LiNi0.88Co0.09Al0.03O2で表されるリチウム含有金属複合酸化物を用いた。正極活物質と、カーボンブラックと、PVdFとを、100:1.0:0.9の質量比で混合し、N−メチル−2−ピロリドンを適量加えた後、これを混練して正極合剤スラリーを調製した。当該正極合剤スラリーを厚みが15μmのアルミニウム箔からなる正極集電体の両面に塗布し、塗膜を乾燥させた後、ローラーを用いて塗膜を圧延した。その後、集電体の両面に合剤層が形成された長尺体を所定の電極サイズに切断して、厚み0.15mm、幅63mm、長さ860mmの正極を作製した。正極の集電体露出部には、アルミニウム製の正極リードを取り付けた。
負極活物質として、黒鉛と、Li2Si2O5で表されるリチウムシリケート相中にシリコン粒子が分散してなる粒子の表面に炭素被膜が形成されたSi含有化合物とを、94:6の質量比で混合して、負極活物質を調製した。負極活物質と、CMCと、SBRのディスパージョンとを、100:1.0:1.0の固形分質量比で混合し、水を適量加えた後、これを混練して負極合剤スラリーを調製した。当該負極合剤スラリーを厚みが8μmの銅箔からなる負極集電体の両面に塗布し、塗膜を乾燥させた後、ローラーを用いて塗膜を圧延した。その後、集電体の両面に合剤層が形成された長尺体を所定の電極サイズに切断して、厚み0.15mm、幅66mm、長さ960mmの負極を作製した。負極の集電体露出部には、ニッケル/銅/ニッケルの積層構造を有する負極リードを取り付けた。
上記正極及び上記負極を、ポリエチレン製のセパレータを介して巻回し、円筒状の巻回型電極体を作製した。
エチレンカーボネートと、フルオロエチレンカーボネートと、ジメチルカーボネートとを、1:1:3の体積比で混合した混合溶媒に、ビニレンカーボネートを4質量%の濃度で溶解させた。その後、LiPF6を1.5モル/リットルの濃度になるように溶解させて、非水電解質を調製した。
上記電極体の上下に絶縁板をそれぞれ配置し、負極リードを外装缶の底部内面に、正極リードを封口体の底板にそれぞれ溶接して、電極体及び絶縁板を外装缶内に挿入した。封口体には、電池ケース内の圧力が所定の閾値を超えたときに開弁する排気弁が設けられている。外装缶は、鉄を主成分とする金属で構成された有底円筒状の容器であって、外周面の放射率は0.25である。なお、外装缶の底部に排気弁は設けられていない。後述する加熱試験において本発明の効果が顕著になるように、外装缶には側面の厚みが通常より薄いものを用いた。電極体が収容された外装缶の内部に上記電解液を注入した後、ガスケットを介して外装缶の開口端部を封口体に加締めることで、円筒形の電池ケースを備える非水電解質二次電池を作製した。電池の外径は21mm、電池の高さは70mm、及び電池の設計容量は4700mAhであった。
外装缶の外周面に黒色塗膜である赤外線吸収層を設けたこと以外は、比較例と同様にして非水電解質二次電池を作製した。黒色塗膜は、外装缶の外周面に黒色塗料をスプレー塗布することで、外装缶の軸方向中央よりも封口体側に位置する領域の略全体に形成した。黒色塗膜が形成された部分の放射率は0.6であった。外装缶の軸方向中央を基準として、排気弁側(封口体側)に位置する領域の放射率が0.6、排気弁と反対側に位置する領域の放射率が0.25であり、その差は0.35であった。
比較例・実施例の各電池について、下記の手順で評価を行った。比較例・実施例それぞれ5つの電池について試験を行い、評価結果(外装缶の横裂けが発生した個数)を表1に示した。
(1)CC−CV充電により満充電状態まで電池を充電した。
(2)満充電状態の電池を300℃に加熱した加熱炉に入れて輻射熱により加熱し、強制的に熱暴走させた。
(3)電池の熱暴走後、電池を加熱炉から取り出し、外装缶の横裂けの有無を確認した。
Claims (6)
- 有底円筒状の外装缶と、前記外装缶の開口部を塞ぐ封口体とを含む円筒形の電池ケースを備えた円筒形電池であって、
前記外装缶の底部又は前記封口体に排気弁が設けられ、
前記電池ケースの外周面において、前記電池ケースの軸方向中央よりも前記排気弁側に位置する第1領域は、前記排気弁と反対側に位置する第2領域よりも放射率が高い、円筒形電池。 - 有底円筒状の外装缶と、前記外装缶の開口部を塞ぐ封口体とを含む円筒形の電池ケースを備えた円筒形電池であって、
前記外装缶の底部及び前記封口体に排気弁が設けられ、
前記電池ケースの外周面において、前記電池ケースの軸方向中央よりも前記底部側に位置する第1領域は、前記封口体側に位置する第2領域よりも放射率が高い、円筒形電池。 - 前記第1領域と前記第2領域の放射率の差は0.35以上である、請求項1又は2に記載の円筒形電池。
- 前記第1領域の少なくとも一部には、前記外装缶の構成材料よりも放射率が高い材料で構成された赤外線吸収層が設けられている、請求項1〜3のいずれか1項に記載の円筒形電池。
- 前記赤外線吸収層の面積は、前記外周面の総面積の25%〜50%である、請求項4に記載の円筒形電池。
- 請求項1〜5のいずれか1項に記載の円筒形電池を複数備える電池モジュールであって、
複数の前記円筒形電池は、それぞれの前記電池ケースの軸方向が互いに平行となる状態で、同一平面上に配列されている、電池モジュール。
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