Toyota Jidosha Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Other

Panasonic Ev Energy Co., Ltd.

Panasonic Corporation

Yugo Nakagawa

Kenichi Suzuki

Toshiaki Nakanishi

Hiromi Kajiya

Shoji Karasawa

A resistance welding quality determination method comprises: a step of detecting a voltage value applied to a welding electrode of a resistance welding machine; a step of detecting a current value supplied to the welding electrode; a step of calculating a welding resistance value based on the voltage value and the current value; a step of correcting the welding resistance value based on a change amount of a contact resistance value between the work and the welding electrode during welding of a work; and a step of determining welding quality of the work based on a corrected welding resistance value obtained by correcting the welding resistance value.

Resistance welding quality determination method and resistance welding quality determination apparatus

A battery having an electrode unit in which edges of electrode plates are mechanically and electrically connected to a fixing and conducting plate is obtained. A projection is formed at an edge of each electrode plate, and projections are inserted into a grove formed on the fixing and conducting plate. Energy beam is radiated to the fixing and conducting plate along a wall defining the groove, and metal forming the groove is melted and fills a gap between the projection and the groove. The filling metal is solidified at a condition that the melted metal surrounds the projection. The electrode plate is firmly connected to the fixing and conducting plate by a combination of the projection and the surrounding metal. The electrode plates are stably maintained at a positional relationship that the electrode plates extend parallel with each other leaving a gap between adjacent electrode plates, and the electrode plates are connected to the fixing and conducting plate with a reliable electric conductivity.

Battery and method of producing the same

Positive and negative electrode plates, after being dried, are layered alternately upon one another with intervening separators therebetween to constitute electrode plate groups. These electrode plate groups are transferred in succession from one to another of a plurality of preliminary chambers, which are respectively constructed to be able to create vacuum of various levels and arranged so that the vacuum level is gradually increased, and finally introduced into a processing chamber in which the vacuum level is highest, where the welding of collector plates to the electrode plate groups is performed with an electronic beam irradiating device. After that, the electrode plate groups are taken out through a post-processing chamber.

Battery manufacturing method and apparatus

The present invention provides an inspection apparatus for an electrode plate-connected structure for a secondary cell for inspecting each bonding portion of an electrode plate-connected structure for a secondary cell including a plurality of electrode plates which are arranged in parallel to one another at prescribed intervals and are perpendicularly connected to a power collecting plate. The apparatus is characterized by including: a lighting section for irradiating light to each of the bonded portions of the plurality of electrode plates and the power collecting plate; a light receiving section for detecting a projected image of each of the bonded portions based on the light irradiated to the electrode plate-connected structure by the lighting section; and an evaluation section for evaluating a bonding state of each of the bonding portions based on the projected image of each of the bonded portions detected by the light receiving section.

Growing community of inventors

Toyohashi, Japan

Yugo Nakagawa