CURRENT BREAKING DEVICE AND POWER STORAGE DEVICE COMPRISING THE SAME

• Main Authors: HIROSE TAKAYUKI, TAMARU KOJIRO, OKUDA MOTOAKI, NISHIHARA HIROYASU
• Format: Patent
• Language: English; Japanese
• Published: 01.10.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To suppress characteristic change of a current breaking device caused by heat of thermal caulking while fixing an energization plate and a support member by utilizing the thermal caulking.SOLUTION: In a current breaking device, a second energization plate 88 electrically connected with an electrode assembly is fixed to a support member 92. When an internal pressure in a case becomes larger than a setting pressure, the second energization plate 88 is broken to cut off a current flowing between a terminal and the electrode assembly. A through-hole 88d is formed at an outer peripheral part of the second energization plate 88. The support member 92 has a thermal caulking boss 92a inserted into the through-hole 88d to fix the support member 92 to the second energization plate 88. In a cross section obtained by cutting the second energization plate at a plane connecting between a central part of the second energization plate and a center of the through-hole and being orthogonal to a surface of the second energization plate, a heat resistance of the second energization plate at the outer peripheral part side from the through-hole is smaller than that at the central part side from the through-hole. 【課題】熱カシメを利用して通電板と支持部材とを固定しながら、熱カシメの熱による電流遮断装置の特性変化を抑制する。【解決手段】電流遮断装置では、電極組立体と電気的に接続される第２通電板８８が支持部材９２に固定されている。第２通電板８８は、ケース内の内圧が設定圧力を超えるときに破断して、端子と電極組立体との間を流れる電流を遮断する。第２通電板８８の外周部には貫通孔８８ｄが形成されている。支持部材９２は、貫通孔８８ｄに挿入され、支持部材９２を第２通電板８８に固定する熱カシメ用ボス９２ａを有している。第２通電板の中央部と貫通孔の中心とを結び、かつ、第２通電板の表面に直交する平面で第２通電板を切断した断面において、第２通電板の熱抵抗は、貫通孔より外周部側の方が、貫通孔より中央部側の方よりも小さい。【選択図】図３