Hitachi Chemical Company, Ltd.

Shin-Kobe Electric Machinery Co., Ltd.

Murashi Shinto

Akira Tanaka

Kenzou Ikeda

Yoshiki Miyamoto

Yuichiro Mishiro

Satoshi Kugino

Naoko Tsurumi

Keiji Hoshino

Hiroshi Kamei

A current collecting structure for which the installation space for current collecting plates is not increased more than necessary even if the number of electrodes to be stacked is increased to increase the capacity of a secondary battery is provided. Positive current collecting platestoconstituting a positive current collecting plate stacking portionare bent at bent portionstoto constitute fixed portionstoand welded portionsto, respectively. The angles of the bent portionstoare 80&#xb0;, 90&#xb0;, 100&#xb0;, 110&#xb0;, and 120&#xb0;, respectively. The angles of the bent portionstoare 120&#xb0;, 110&#xb0;, 100&#xb0;, 90&#xb0;, and 80&#xb0;, respectively. Negative current collecting plates are also bent in the same manner.

Current collecting structure for secondary battery and secondary battery

A thin film is used in a metallic collector in order to increase the volume energy density. However, the strength of the thin film is low, so when a negative plate or a positive plate is directly joined to a terminal base portion, even an insignificant load might cause damage, such as cutting of the metallic collector. Even in a structure where the metallic collector is joined to a highly-conductive plate-like metal or a highly-conductive plate-like resin, and where the collecting plate is joined to a terminal base portion, the connection between the collecting plate and the terminal base portion affects the battery properties. The present invention provides a rechargeable battery including an electrode group in which a metallic collector having a negative active material layer formed on a surface, a separator retaining an electrolyte, and another metallic collector having a positive active material layer formed on a surface are alternately disposed in a layered manner into a strip shape such that the separator is interposed between the two kinds of metallic collectors, and electrode plate tabs formed at ends of the two kinds of metallic collectors are joined to each of metallic collecting plates by a predetermined number, and the metallic collecting plates are joined together with pressing plates, by fitting between a bolt and a nuts, to a terminal base portion having a through-hole for the bolt.

Rechargeable battery

If a non-aqueous electrolyte secondary battery has a seal structure between a lid and an electrode terminal in which a seal member is compressed by fastening a nut, the nut may be loosened to make the amount of compression of the seal member insufficient to reduce the seal performance even if the nut is fastened enough to obtain an appropriate amount of compression of the seal member at the time of manufacture of the battery. A battery case has an opening, and houses an electrode group and an organic electrolyte. A lid is fastened to the battery case, and tightly seals the opening of the battery case. An electrode terminal is electrically connected to the electrode group. The lid and the electrode terminal face each other via an elastic member.

Non-aqueous electrolyte secondary battery

A safety valve is disposed to cover at least a portion of the center line of the lid plate between the pair of terminals for the positive electrode and the negative electrode. The distance from the center line of the lid plate to end portions of the components to be energized on the safety valve side is equal to or less than the distance from the center line of the lid plate to the outermost circumference of the safety valve. The shadow area obtained by projecting an opening portion of the safety valve in operation onto the plane of the lid plate does not overlap with the respective shadow areas obtained by projecting the electrically connected components, such as the external output terminals for the positive electrode and the negative electrode, onto the plane of the lid plate.

Growing community of inventors

Tokyo, Japan

Murashi Shinto