NOVELTY - A secondary battery has an electrode body (1) consisting of upper negative electrode current collecting plate (3), lower negative electrode current collecting plate (4), elastic body (2) and active material layers (6,7), with a slit formed in the upper and lower negative electrode current collecting plates. The elastic body has elastic body projection portion (5) which passes through between the slits of the upper and lower negative electrode current collecting plates and the active material layers.    USE - Secondary battery used as power supply of various apparatuses, appliances and electric tools. Uses include but are not limited to portable information communication apparatus such as personal computer, word processor, cordless telephone, mobile telephone, vehicle telephone, handheld terminal, transceiver and portable wireless apparatus, various portable apparatus such as portable copy machine, electronic organizer, calculator, liquid crystal television, radio, headphone stereo cassette tape recorder, portable compact disk (CD) player, electric shaver, electronic translating machine, voice input device and memory card, domestic electrical appliance such as refrigerator, air conditioner, television, stereo, water heater, oven, microwave oven, dishwasher, drier, washing machine, lighting fixture and toy and electric tool such as electrically driven wheelchair, electrically driven bed, electrically driven bathing facilities for nursing care. Can also be used as power supply for moving bodies such as electric vehicle, hybrid vehicle, plug-in hybrid electric vehicle, golf cart, turret vehicle, medical device, construction machine, electric power storage system, lift and unmanned moving vehicle.    ADVANTAGE - Deformation of secondary battery electrode structure accompanying swelling contraction of active material layer is suppressed to improve the charging/discharging life cycle of the secondary battery.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a manufacturing method for secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the longitudinal cross sectional view of the structure of the electrode body.    Electrode body (1)    Elastic body (2)    Upper negative electrode current collecting plate (3)    Lower negative electrode current collecting plate (4)    Elastic body projection portion (5)    Active material layers (6,7)