PURPOSE: To provide a non-aqueous electrolyte secondary battery having an improved electric charging/discharging cycle characteristic by filling an electrode group consisting of positive and negative electrode plates alternately laminated via separators and expansible materials interposing the electrodes.
CONSTITUTION: Positive electrode plates 1 having reversibility with respect to electric charging/discharging and negative electrode plates 2 made of a carbon material as a main active material are alternately laminated via separators 3 made of polypropylene. A filter 9 expansible toward both sides is disposed in such a manner as to interpose the electrodes, and they are tightly inserted into a battery jar 4. An electrolyte, in which lithium perchlorate is dissolved into a solvent obtained by mixing propylene carbonate with ethylene carbonate is injected, and then, a port sealing plate 8 is bonded to the battery jar 4. A core material of the negative plate 2 and a core material of the positive plate 1 are connected to a negative electrode terminal 5 of the port sealing plate 8 via leads 7, 6, followed by spot welding. Consequently, it is possible to provide a non-aqueous electrolyte secondary battery which can restrain loosening of the electrode plates due to expansion or contraction caused by electric charging/ discharging of the battery.
HASEGAWA MASAKI
ITO SHUJI
MIFUJI YASUHIKO
TOYOGUCHI YOSHINORI
