Matsushita Electric Industrial Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Panasonic Corporation

Ube Industries, Inc.

Primearth Ev Energy Co., Ltd.

Hajime Konishi

Takeshi Yao

Takashi Yokoyama

Koji Abe

Hideharu Takezawa

Hideki Sano

Toshikazu Hamamoto

Shozo Fujiwara

Takashi Takeuchi

Masaharu Miyahisa

Michio Ito

Akira Ueki

Shoichiro Watanabe

Koichi Toriyama

Hideki Kasahara

Tatsuhiko Suzuki

Yoshiyuki Ozaki

Toshihiko Mitsuhashi

Toshihiko Inoue

Shigeyuki Unoki

Yoshinobu Morita

Hideya Asano

Kaoru Kajita

Katsumi Yamashita

Motohide Masui

Naoko Souma

Makoto Imamura

Masato Harada

Tadaya Okada

A rechargeable battery includes a battery case, a cover that closes an open end of the battery case, and a power collection terminal arranged on the cover to supply power from a power generating element to an external terminal. The power collection terminal extends through a gasket arranged on a lower surface of the cover, an insulator arranged on an upper surface of the cover, and the external terminal arranged on an upper surface of the insulator. An annular sealing member is held between the lower surface of the cover and the gasket. The insulator is a resin-molded component. The insulator includes a through hole defined by an inner wall that includes a lower open end, an upper open end, and a central portion. At least one of the lower open end and the upper open end has a larger diameter than the central portion.

Rechargeable battery and method for molding insulator

A method for producing a battery resulting from the joining with a plurality of weld nuggets therebetween of a foil layered part, at which foil exposed portions exposing an aluminum foil overlap, and a positive terminal member made of aluminum, includes: a formation step for forming at the foil layered part a foil welded part at which are formed, by welding aluminum foils together by means of ultrasonic welding, a first high-position part at at least a section of a surface to be joined, and a plurality of first low-position parts distributed at scattered points within the first high-position part; and a resistance-welding step for contacting the first high-position part to the positive terminal member, generating weld nuggets at the first low-position part by flowing an electric current, and resistance-welding the foil welded part and the positive terminal member with the weld nuggets therebetween.

Method for producing battery and battery

The present invention provides a method for producing a nonaqueous electrolyte secondary battery in which the drop in capacity retention rate is controlled by forming a coating in a more favorable state on the surface of the negative electrode active material. This production method comprises a step Sof preparing a battery assembly in which an electrode assembly is housed within a battery case, the electrode assembly including a positive electrode produced by forming a positive electrode active material layer containing at least a positive electrode active material, and a negative electrode produced by forming a negative electrode active material layer containing at least a negative electrode active material; a first injection step Sof injecting a nonaqueous electrolyte containing a specified additive into the battery case; a precharging step Sof forming the additive-derived coating on the surface of the negative electrode active material; a second injection step Sof injecting a nonaqueous electrolyte not containing an additive into the battery case; and a charge and discharge step Sof charging and discharging the battery assembly to a predetermined charging and discharge voltage.

Method for producing nonaqueous electrolyte secondary battery

A positive electrode active material powder for a non-aqueous electrolyte secondary battery, wherein an amount of a liquid reagent absorbed by the powder is 20 to 40 ml per 100 g of the powder when the liquid reagent is dibutyl phthalate, and the amount is 20 to 50 ml per 100 g of the powder when the liquid reagent is N-methyl-2-pyrrolidone or water, the absorption amount is a value measured using a device according to test method A or B regarding DBP absorption based on JIS K6217 (1997), and the measured value is an amount of the liquid reagent added until the viscosity of a mixture of the powder and the liquid reagent reaches a level corresponding to 70% of a maximum torque which is recorded when a change in the viscosity of a mixture of the powder and the liquid reagent is measured by a torque detecting device.

Positive electrode active material, non-aqueous electrolyte secondary battery containing the same and method for evaluating positive electrode active material

A non-aqueous electrolyte containing propylene carbonate and 1,3-propanesultone as additives can reduce the amount of a gas evolved during storage at a high temperature of a non-aqueous electrolyte secondary cell comprising the electrolyte, a non-aqueous electrolyte containing at least one compound selected from the group consisting of vinylene carbonate, diphenyl disulfide, di-p-tolydisulfide and bis(4-methoxyphenyl)disulfide as comprising the electrolyte, and a non-aqueous electrolyte containing a combination of the above-two types of additives can provide a non-aqueous electrolyte secondary cell exhibiting excellent retention of capacity and storage stability.

Non-aqueous electrolyte and non-aqueous electrolyte secondary battery

A method for managing a back-up power source capable of maintaining the discharge capacity of a nickel metal-hydride storage battery for a long-term at a low cost, and is suitable for the management of the back-up power source for the guidance lights, the emergency lights, the information telecommunication systems, and the like is disclosed. The present invention provides a method for managing the back-up power source which uses a nickel metal-hydride storage battery including a positive electrode mainly consisting of nickel oxide, a negative electrode mainly consisting of a hydrogen storage alloy, a separator and an alkaline electrolyte, wherein an intermittent charge is performed on the nickel-metal hydride storage battery, comprising: calculating a self-discharge quantity of the nickel-metal hydride storage battery during idle period of the intermittent charge on the basis of a temperature of the nickel-metal hydride storage battery at the idling; and controlling the charging of the nickel-metal hydride storage battery on the basis of the obtained self-discharge quantities.

Method for managing back-up power source

Provided are alkaline storage batteries which are higher in active material utilization as compared with conventional batteries and which can maintain the high utilization even after long-term charge-discharge cycle. Cobalt hydroxide having a BET specific surface area of 20-30 m.sup.2 /g and obtained by neutralization reaction of a cobalt salt solution and an aqueous alkali solution in the presence of a reducing agent is added to a positive electrode active material.

Alkaline storage battery and method for making same

There is provided a method of making uniform porous fluoroplastic membranes having a high Gurley number and a narrow permeability range, this method comprising closing the pores on part of the surface of a fluoroplastic film by compression or by application of an ink. Also provided is a button type air depolarized battery having stable, long-term discharge characteristics over a wide range of load, by employing therein the foregoing porous fluoroplastic membrane having a high Gurley number. The battery structure is similar to that of a conventional battery, but is equipped with the foregoing improved fluoroplastic membrane.

Process of making porous fluoroplastics membrane for an air depolarized

This invention relates to a battery pack composed of a plurality of flat type gas depolarizable galvanic cells such as the zinc-air battery system and its packaging method for such battery pack. More specifically, projections of a certain value of height are formed on at least one of the outer surfaces of the positive and negative terminals of the flat type gas depolarizable galvanic cells and a hydrophobic membrane of a certain value of Gurley number is employed in each cell in the battery pack.

Battery pack and its packaging method

Growing community of inventors

Ikoma, Japan

Hajime Konishi