SQUARE SECONDARY BATTERY, BATTERY PACK USING THE SAME, AND METHOD FOR MANUFACTURING SQUARE SECONDARY BATTERY

• Main Authors: YAGI HIROMASA, WAKIMOTO RYOICHI, FUJIWARA ISAO, KITAOKA KAZUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 22.12.2016
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a high-capacity square secondary battery having a high volume energy density, and a battery pack using the same.SOLUTION: An electrode body including a positive electrode plate and a negative electrode plate comprises a positive electrode tab part 4c in an end part of a sealing plate 2 side. A pressure-sensitive current interruption mechanism 40 includes a conductive member 41 having an opening 41x on the electrode body side, and a deformation plate 42 sealing the opening 41x. A positive electrode collector 6 includes a collector body part 6a and a collector connection part 6b. The collector connection part 6b is a portion folded back from an end part of the collector body part 6a. The deformation plate 42 is connected to the collector body part 6a, and a positive electrode tab part 4c is connected to the collector connection part 6b. When a pressure in the battery becomes a prescribed value or higher, the deformation plate 42 deforms and a groove 6d fractures with the deformation of the deformation plate 42. Due to this fracture, a conductive path between the positive electrode plate and a positive electrode terminal 7 is disconnected, thereby cutting off current.SELECTED DRAWING: Figure 7 【課題】高い体積エネルギー密度を有する高容量の角形二次電池及びそれを用いた組電池を提供する。【解決手段】正極板及び負極板を含む電極体は封口板２側の端部に正極タブ部４ｃを有し、感圧式の電流遮断機構４０は、電極体側に開口部４１ｘを有する導電部材４１と、この開口部４１ｘを封止する変形板４２を含む。正極集電体６は、集電体本体部６ａと集電体接続部６ｂを有し、集電体接続部６ｂは集電体本体部６ａの端部から折り返された部分であり、集電体本体部６ａには変形板４２が接続され、集電体接続部６ｂには正極タブ部４ｃが接続される。電池内圧が所定値以上となったとき変形板４２が変形し、変形板４２の変形に伴い溝部６ｄが破断することにより、正極板と正極端子７の間の導電経路が切断され、電流が遮断される。【選択図】図７