SECONDARY BATTERY AND ITS MANUFACTURE

Japanese Patent JP3261688

B2

PURPOSE: To provide a secondary battery having improved charging/discharging ability by including a member which is deformed at the predetermined temperature and applying/releasing a pressure to/from a part of the inside of a battery case.
CONSTITUTION: A secondary battery is formed by inserting and including a group of electrodes, in which a negative electrode 101 and a positive electrode 102 are opposedly arranged via a separator 103, into a battery case 104 with a member 105 whose shape is changed at a desired temperature. When the battery is heated above the desired first temperature, the member 105 is deformed, so that the volume occupied by the group of electrodes is reduced, the group of electrodes is sufficiently pressurized in the vertical direction in the inside of the case 104, and a battery internal impedance is reduced, and consequently, a secondary battery provided with improved charging/discharging ability is obtained. If a substance whose shape can be reversibly changed is used for the member 105, a pressure applied on the group of electrodes is released at the second temperature other than the actual using temperature, so that the group of electrodes can be easily pulled out when the battery is disassembled.

Shinya Mishina
Soichiro Kawakami
Naoya Kobayashi
Masaya Asao

JP19884694A

March 04, 2002

August 23, 1994

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Canon Inc

H01M10/05; H01M10/04; H01M10/058; H01M10/42; H01M50/574; H01M6/50; (IPC1-7): H01M10/04; H01M2/12; H01M2/34; H01M10/40

JP4196063A
JP3147249A
JP6372062A
JP625564U
JP28863U

Hisao Fukumori

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