JP7458008B2 - 二次電池及び絶縁部材 - Google Patents
二次電池及び絶縁部材 Download PDFInfo
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- JP7458008B2 JP7458008B2 JP2021503421A JP2021503421A JP7458008B2 JP 7458008 B2 JP7458008 B2 JP 7458008B2 JP 2021503421 A JP2021503421 A JP 2021503421A JP 2021503421 A JP2021503421 A JP 2021503421A JP 7458008 B2 JP7458008 B2 JP 7458008B2
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- Prior art keywords
- positive electrode
- insulating member
- heat
- resistant
- adhesive
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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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
- H01M50/50—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
- H01M50/593—Spacers; Insulating plates
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
- H01M50/572—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
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- 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
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Description
正極活物質としてLiNi0.88Co0.09Al0.03O2で表されるリチウムニッケルコバルトアルミニウム複合酸化物を100重量部と、アセチレンブラック(AB)を1重量部と、ポリフッ化ビニリデン(PVDF)を1重量部とを混合し、さらにN-メチル-2-ピロリドン(NMP)を適量加えて、正極活物質スラリを調製した。次に、当該正極活物質スラリをアルミニウム箔からなる正極集電体の両面に塗布し、乾燥させた。これを所定の電極サイズに切り取り、ローラを用いて圧延し、正極集電体の両面に正極活物質層が形成された正極を作製した。正極の長手方向の略中央部に、正極活物質層が形成されておらず、正極集電体が露出した露出部(幅6mm)を形成した。形成した露出部に、厚み150μm、幅3.5mmのアルミニウム製正極リードを超音波溶接で接合した。
耐熱部に含有される無機材料の種類と含有量、及び耐熱部の厚さを表1に示すように変更したこと以外は、実施例1と同様にして正極及二次電池を作製した。
粘着部を設けなかったこと以外は、実施例5と同様にして正極及び二次電池を作製した。
耐熱部を設けなかったこと以外は、実施例1と同様にして正極及び二次電池を作製した。
各実施例及び各比較例の二次電池について、強制的に内部短絡させた場合の電池温度を測定した。各二次電池を電流値500mAで充電終止電圧4.2Vまで定電流充電し、4.2Vで60分間定電圧充電を行った。異物短絡時の電池温度とは、絶縁テープの上に異物(ニッケル小片)を仕込み、JIS C 8714に従い、強制的に短絡させた時の電池の側部の温度を熱電対で測定した時の最高到達温度である。表1に各実施例及び比較例の結果を示す。
別途、各実施例及び各比較例の正極を用意した。絶縁部材を正極の露出部に貼り付けて60℃で1時間放置した後、絶縁部材が正極から剥がれているかを目視で観察した。表1に各実施例及び比較例の結果を示す。
11 正極
12 負極
13 セパレータ
14 電極体
15 電池ケース
16 ケース本体
17 封口体
18,19 絶縁板
20 正極リード
20a 一端部
20b 延出部
21 負極リード
22 張り出し部
23 フィルタ
24 下弁体
25 絶縁体
26 上弁体
27 キャップ
28 ガスケット
30 正極集電体
31 正極活物質層
33 絶縁部材
33a 基材部
33b 耐熱部
33c 粘着部
35 積層部
37 露出部
40 負極集電体
41 負極活物質層
Claims (14)
- 正極の表面と接続する正極リードの一部に対向して配置される絶縁部材であって、
基材部と、
前記基材部の一方の表面の一部に形成される、絶縁性の無機材料を含む耐熱部と、
前記基材部及び前記耐熱部の表面の少なくとも一部を覆う粘着部とを備え、
前記耐熱部は単数又は複数のストライプ状の形状を有し、
前記粘着部は、少なくとも前記基材部の幅方向の両端に設けられている、絶縁部材。 - 前記耐熱部は、接着性を有する高分子を含む、請求項1に記載の絶縁部材。
- 前記高分子は、アクリル系ポリマ、アクリロニトリル系ポリマ、ゴム系ポリマのうち少なくとも一つを含む、請求項2に記載の絶縁部材。
- 前記耐熱部における前記無機材料の含有量は、35重量%以上99%重量%以下である、請求項1~3のいずれか1項に記載の絶縁部材。
- 前記無機材料は、絶縁性の金属酸化物、金属水酸化物、金属硫酸塩、金属リン酸塩のうち少なくとも一つを含む、請求項1~4のいずれか1項に記載の絶縁部材。
- 前記耐熱部の厚みは、1μm以上30μm以下である、請求項1~5のいずれか1項に記載の絶縁部材。
- 前記粘着部は、ゴム系ポリマ、アクリル系ポリマのうち少なくとも一つを含む、請求項1~6のいずれか1項に記載の絶縁部材。
- 前記粘着部は、前記耐熱部の表面全体を覆っている、請求項1~7のいずれか1項に記載の絶縁部材。
- 正極と、前記正極と接続した正極リードとを備え、
前記正極は、正極集電体と、前記正極集電体の少なくとも一方の表面において形成された正極活物質層とを有し、
前記正極の表面の少なくとも一方の表面は、前記正極活物質層が形成された積層部と、前記正極集電体が露出した露出部を有し、
前記正極リードは、前記露出部に接続された一端部と、前記一端部から前記正極の外側に延出した延出部とを有し、
請求項1~8のいずれか1項に記載された絶縁部材をさらに備え、
前記絶縁部材は、前記耐熱部が前記一端部の外表面に対向するように前記正極の表面に配置される、二次電池。 - 前記ストライプ状の形状の長手方向が前記一端部の長手方向と平行である、請求項9に記載の二次電池。
- 前記絶縁部材は、前記耐熱部が前記露出部の全体に対向するように前記正極の表面に配置される、請求項9又は10に記載の二次電池。
- 前記絶縁部材は、前記耐熱部が前記露出部の一部に対向するように前記正極の表面に配置される、請求項9~11のいずれか1項に記載の二次電池。
- 前記絶縁部材の前記粘着部が前記正極活物質層と接着している、請求項9~12のいずれか1項に記載の二次電池。
- 前記基材部とは別の基材部と、前記別の基材部の一方の表面の一部に形成される、絶縁性の無機材料を含む別の耐熱部と、前記別の基材部及び前記別の耐熱部の表面の少なくとも一部を覆う別の粘着部とを有する前記絶縁部材とは別の絶縁部材をさらに備え、
前記別の絶縁部材が、前記正極リードと接続していない前記正極の面に配置され、前記別の耐熱部は前記一端部に対応する位置に対向する、請求項9~13のいずれか1項に記載の二次電池。
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