Mitsubishi Denki Kabushiki Kaisha

Syoji Yoshioka

Hisashi Shiota

Hiroaki Urushibata

Takashi Nishimura

Shigeru Aihara

Daigo Takemura

Makiko Kise

Jun Aragane

Masaharu Moriyasu

Hironori Kuriki

Shinji Nakadeguchi

Kiyoshi Hanafusa

Hiroiti Ishida

In case of a conventional battery having a laminated sheet material as a battery case for storing a battery body, the metal foil on the laminated sheet does not contact to either a positive electrode or a negative electrode and electric potential is unstable. Therefore, there was a problem that it was impossible to obtain electrical shielding effect. In order to maintain the function of the sealed part in the battery case, an extended part extended from the sealed part is disposed at a position where it overlaps with the positive electrode lead or the negative electrode lead, and by jointing the lead and the extended part with the conductive material piercing therethrough, the metal foil on the laminated sheet material of the battery case is electrically connected to the lead to maintain the electric potential of the battery case to the electric potential of the positive electrode or the negative electrode.

Battery and process for examining battery

The battery of the present invention comprises the electrode which contains the pre-determined amount of electronically conductive material at which resistance increases in accordance with temperature rise and conductive agent; the electrode wherein the ratio of the total amount of the electronically conductive material and the conductive agent to the active material is set to a pre-determined value; and the electrode wherein the average particle size of the conductive agent based on the average particle size of the electronically conductive material is in a pre-determined range. The coducitive material contains an electrically conductive filler and a crystalline resin. The conductive material and the coductive agent are contacted with the active material. A significant reduction in short circuit current is achieved over a defined range of conductive agent particle size.

Battery and electrode including an active material, an electrically conductive material and a conducting agent

Conventional batteries have a problem that, in case the battery temperature should rise to 100&deg; C. or higher due to an internal short-circuit, etc., a large short-circuit current develops to generate heat. It follows that the battery temperature further increases, which can result in a further increase of the short-circuit current. Further, some of electrode structures involve reduction in discharge capacity. These problems are solved by a battery in which an electron conductive material ( ), being in contact with an active material ( ) in an electrode, comprises a conductive filler and a resin so that the electrode may increase its resistivity with a temperature rise, and the ratio of the particle size of the electron conductive material ( ) to that of the active material ( ) is in a range of from 0.1 to 20.

Cell and method of producing the same

The object of the present invention is to obtain an electrode whose resistivity increases with temperature, and a battery using the same. Specifically, the invention consists in limiting the proportion of a conductive filler contained in electron conductive particles of an electron conductive particle layer to a range of from 55 to 70 parts by weight. A battery constituted by using the electrode has an increased discharge capacity and is capable of reducing a short-circuit current.

Electrode having PTC function and battery comprising the electrode

A battery with an active material layer having an active material an electronically conductive material contacted to the active material and an electrolytic layer jointed with the active material layer wherein the electronically conductive material comprises an electrically conductive filler and a resin having a predetermined thermal melting temperature T and has a Positive Temperature Coefficient (PTC) such that resistance of the electrically conductive material increases with temperature, and wherein the active material layer and the electrolytic layer are laminated and are jointed together by heating the resin to a predetermined thermal treatment temperature T

Battery and process for preparing the same

Electrode, method or producing electrode, and cell comprising the electrode

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Tokyo, Japan

Syoji Yoshioka