公开(公告)号：JPH09233713A

公开(公告)日：1997-09-05

申请号：JP3219196

申请日：1996-02-20

Applicant: IBM ,  A T BATTERY KK ,  TOSHIBA BATTERY

Inventor： MITO TOSHITSUGU ,  KIZAWA MASAHITO ,  NAKAGAWA HIROSHI ,  MUKAI KAZUO ,  SHIOJIMA NOBUO ,  ISSHIKI MASANORI ,  ITO NORIYUKI

IPC: G01R31/36 ,  H01M10/44 ,  H01M10/48 ,  H02H7/18 ,  H02J7/00

Abstract: PROBLEM TO BE SOLVED: To inform used equipment such as a charger or a batter of its abnormality and prevent overcharge or overdischarge by changing the temperature detection output into the signal equivalent abnormal temperature, when this protective circuit detects the abnormality of the charge condition or discharge condition of a secondary battery. SOLUTION: Secondary batteries 1 and 2 are charged by fixed voltage charge method used for, for example, a lithium secondary battery, a lead battery, etc. The batteries 1 and 2 are connected in series, and n-channel FETs 3 and 4 constituting first and second switch elements are connected in series to the charge/discharge circuit. The parasitic diodes D1 and D2 of the FETs 3 and 4 get in forward direction at the time of charge and discharge. In a protective circuit, the + terminal, to the + terminal of the battery 1, and the - terminal, to the source of the FET 3, and a thermistor 1, between the outer terminal T and the - terminal, are connected. The thermistor 11 operates overcharge or overdischarge preventive circuits 5 or 6 through a transistor 12 and an abnormality detection circuit 10 so as to charge or discharge it properly when the temperature during charge or discharge deviates from the specified range.

公开(公告)号：JPH08293327A

公开(公告)日：1996-11-05

申请号：JP9206395

申请日：1995-04-18

Applicant: IBM

Inventor： MITO TOSHITSUGU ,  KIZAWA MASAHITO

IPC: H02J7/00 ,  H01M2/10 ,  H01M10/46 ,  H01M10/48

Abstract: PURPOSE: To prevent fire breakouts due to an evaporated gas of an electrolytic solution by isolating an electric circuit and the surrounding of the battery cell side by partitioning with a partitioning well the battery chamber to house a battery cell and an electric circuit chamber to house the electric circuit. CONSTITUTION: An electric circuit chamber A to house an electric circuit, a battery chamber B to house one or more battery cells, and a partitioning wall 26 to partition the electric circuit chamber A and the battery chamber B are formed in the inside of a shallow substrate 21. Cut parts 27a, 27c into which lead wires in the anode side and the cathode side of a battery cell assembly are to be inserted are formed in the partitioning wall 26, a cut part 27b into which a terminal of a thermistor to detect the ambient temperature of the battery cells is to be inserted is also formed in the wall 26, and cut parts 27d, 27e into which lead wires to monitor the terminal voltage in the middle point of the battery cell assembly are inserted are further formed in the wall 26. Moreover, a groove part 28 which is connected with the partitioning wall 26 is formed in approximately the front part of a shallow cover body 22 and cut parts 29a-29e corresponding to the cut parts 27a-27e formed in the rim part of the partitioning wall 26 are formed in the groove part 28 and at the same time, safety holes 25a-25c are formed in the rear bottom face of the cover body 22.