Hitachi Automotive Systems, Ltd.

Suguru Watashi

Kazuaki Urano

Kouichi Kajiwara

Fujio Hirano

Yoshio Onodera

Yuichi Takatsuka

Kiyoyuki Sekine

Yasuhiro Matsuoka

Ryousei Kawai

A prismatic secondary battery includes: an electrode group including electrodes formed of positive electrodes and negative electrodes each having an active material layer coated on a surface of a metallic foil, the electrodes formed of positive and negative electrodes are flatly wound together with a separator intervening with the positive and negative electrodes, the positive and negative electrodes being each formed with a metallic foil exposed section at one end in a direction of a winding axis L; and connection plates that electrically connect the electrode group and electrode terminals. The metallic foil exposed sections of the electrode group and the connection plates are press-joined. At least a portion of the press-joined sections constituted by the metallic foil exposed sections and the connection plates is covered with a resin material.

Prismatic secondary battery

A wound electrode body is fabricated by laminating and winding positive and negative electrode sheets together with a separator therebetween for insulation. On both positive and negative electrode side ends of the wound electrode body, laminates of current-collecting foil layered portions of the electrode sheets are bent or folded f toward the outer peripheral side to be separated into two. The separated laminates and forked connector leaves are overlapped and clamped between an ultrasonic chip and an anvil. Then, they are welded. The forked connector leaves are arranged such that no opposing forked connector leaf is present in the direction of a line normal to the forked connector leaf, so that the anvil does not have to be cantilevered. This allows welding by using the ultrasonic chip and the anvil without interfering with the collector rs. As a result, the quality of welding is improved.

Prismatic cell and production method for the same

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Hitachinaka, Japan

Suguru Watashi