Panasonic Intellectual Property Management Co., Ltd.

Gs Yuasa International Ltd.

Etsuko Ogasawara

Kazuhiro Sugie

Yu Kojima

Kenji Izumi

Takeshi Chiba

Kazuhiko Shimoda

Kazunari Ando

Yoshinobu Sato

Misaki Harada

Takuya Kikuchi

A lead acid battery including: a positive electrode plate including a positive electrode grid and a positive electrode active material; a negative electrode plate including a negative electrode grid and a negative electrode active material; an electrode plate group including the positive electrode plate, the negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate; a battery container including a plurality of cell chambers each accommodating the electrode plate group and an electrolyte; and a lid sealing an opening of the battery container. A ratio P/N of mass P of the positive electrode active material to mass N of the negative electrode active material is 1.25 or more and 1.65 or less. The negative electrode grid contains bismuth in an amount of 1 ppm or more and 300 ppm or less.

Lead acid battery

In a lead-acid battery including an electrode plate group housed in a cell chamberwith an electrolyte, each positive electrode plate includes a positive electrode grid made of lead or a lead alloy containing no antimony, and a positive electrode active material with which the positive electrode grid is filled. Each negative electrode plate includes a negative electrode grid made of lead or a lead alloy containing no antimony, a surface layer formed on a surface of the negative electrode grid and made of a lead alloy containing antimony, and a negative electrode active material with which the negative electrode grid is filled. A mass ratio M/Mfalls within a range of 0.70 to 1.10, where Mrepresents the mass of the positive electrode active material per cell chamber, and Mrepresents the mass of the negative electrode active material per cell chamber.

Lead-acid battery

Growing community of inventors

Shizuoka, Japan

Etsuko Ogasawara