Toyota Jidosha Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Other

Panasonic Corporation

Panasonic Ev Energy Co., Ltd.

Primearth Ev Energy Co., Ltd.

Toyoda Jidosha Kabushiki Kaisha

Toyota Jidosha Kabushiki Aichi

Shinji Hamada

Toyohiko Eto

Munehisa Ikoma

Takashi Asahina

Noriyuki Fujioka

Hiroshi Inoue

Shinsuke Fukuda

Yoshiaki Ogata

Hiromu Matsuda

Nobuyasu Morishita

Tomohiro Matsuura

Shuhei Marukawa

Naoto Arai

Akihiro Taniguchi

Toshiyuki Sekimori

Masato Onishi

Tomokazu Yamauchi

Yoshitaka Sunagawa

Hiroyuki Miyamoto

Mitsugu Takaki

Shinichi Yuasa

Hiromi Kajiya

Manabu Kakino

Miho Okamoto

Tadao Kimura

Masayoshi Iwase

Kanji Takata

Shinichi Shimakawa

Izumi Yamamura

Kyouei Miura

Akinori Yokota

Takashi Ichiyanagi

Shinichiro Ito

Hiroshi Nagata

Yoshiyuki Nakamura

Ko Watanabe

Noboru Ito

Kazuo Tojima

Kenji Sato

Masanori Ito

Katsunori Komori

Shoji Karasawa

Keiji Shukuya

Hideki Kasahara

Hideo Asaka

Shigeru Matsumoto

Yoshitaka Sugimoto

Kenji Fukumoto

Daisuke Muramatsu

Hiroshi Yamasaki

Hideki Ando

Shuhei Marujawa

Kejii Shukuya

Noriyuki Ip Development Center Fujioka

A sealed battery includes a return type safety valve. An annular projection that projects toward a valve body from a valve port is formed on a valve seat for the safety valve. The projection includes a first projection region and a second projection region that are defined by a shape of a tip of the projection and arranged in parallel in a circumferential direction of the valve port. The first projection region and second projection region have different curvature radii in a cross-section of the projection taken along an axial direction of the valve body. The pressure per unit area applied to the second projection region by the valve body is higher than the pressure per unit area applied to the first projection region by the valve body.

Sealed battery and safety valve

An alkaline storage battery has an electrode terminal that is inserted in a penetration hole, and disposed astride an inside of a battery case and an outside of the battery case, and fastened to a hole periphery portion via a packing. The negative terminal has a seal portion that, together with the hole periphery portion, clamps and compresses the packing to liquid-tightly seal the penetration hole. The seal portion includes an annular seal surface located facing the hole periphery portion, and a seal periphery surface located around the seal surface. The seal surface is protruded from the seal periphery surface toward the hole periphery portion. The surface roughness Ry of the seal surface of the negative terminal is 15 &#x3bc;m or less.

Alkaline storage battery

A nickel-metal hydride secondary battery includes: a plurality of power generating elements each having a negative plate containing hydrogen absorbing alloy; a battery case provided with partition walls and a plurality of compartments arranged adjacently on both sides of each partition wall, each of the compartments accommodating each power generating element, and the compartments allowing gas intercommunication between compartments through communication holes formed in the partition walls; and at least one of safety valves placed on the battery case, the safety valves being less in number than the number of the compartments; wherein each of the communication holes has a hole sectional area per battery module capacity in a range 0.03 to 0.30 mm/Ah.

Nickel-metal hydride secondary battery module and secondary battery module manufacturing method

An object is to provide a battery pack which can restrict movements of battery a module and a spacer even after use for a long period. A battery packcomprises a plurality of battery modules, a plurality of holding spacerseach being placed in a space between the battery modules, and a first and second spacer support memberswhich hold the holding spacersin a vertical direction Z. Each holding spacerincludes a plurality of first elastic membersand a plurality of second elastic memberswhich protrude in the vertical direction Z. The holding spaceris elastically held between the first and second spacer support memberswhile the first and second elastic membersare elastically deformed into elastic pressure contact with the first and second spacer support members

Battery pack having battery modules held by holding spacers

A sealed-type secondary battery is disclosed. A battery module of a sealed-type secondary battery is formed by heating and fusing a top lid member and an integrated battery container. The integrated battery container is formed with a polymer alloy including a polyphenylene ether resin and a polyolefin resin, and the top lid member or a lateral lid member is formed with a polypropylene-based resin. A nucleating agent is added to the polypropylene-based resin of the top lid member or the lateral lid member, to improve mechanical strength, and the molecular weight is increased to reduce a melt flow rate MFR to approximately the same degree as the polymer alloy.

Sealed-type secondary battery with integrated battery container formed with a polypropylene-based resin

A prismatic sealed rechargeable battery includes a substantially prismatic battery case that accommodates an electrode plate assembly and an electrolyte solution. The battery case is formed of metal. On a side face of the battery case, a thin plate is provided which has a plurality of protruding portions formed in parallel at appropriate intervals. The protruding portion and the side face form spaces opened at both ends therebetween. The thin plate is bonded to the side face of the battery case by making flat portions between the protruding portions into surface-contact with the side face, thereby improving cooling capability of the battery.

Prismatic sealed rechargeable battery, battery module, and battery pack

A secondary battery comprises a power generating element, a battery case including a gas release hole, and a valve safety device configured to close the gas release hole and release gas out of the battery case when inner pressure in the battery case exceeds a predetermined value. The safety valve device comprises a valve member and a holding member. The valve member includes a sealing portion hermetically making contact with a sealed surface around the gas release hole, and the holding member is fixed to the battery case to elastically press the sealing portion by its elastic deformation.

Secondary battery

A cell includes an electrode plate group which is formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed between them, and includes leads protruding toward directions opposite to each other from one side of the positive electrode plate and the negative electrode plate. Collectors are joined to the leads on both sides of the electrode plate group, and include connection protrusions formed so as to protrude outside. A bag-shape battery case containing the electrode plate group is joined to the collectors such that only the connection protrusions of the collectors are protruded outside the bag-shaped battery case. A battery module is constituted by placing a plurality of the cells, connected together, into a prismatic battery case.

Cell, connected-cell body, and battery module using the same

An inexpensive battery pack including a battery module wherein a safety valve is provided for each cell in which battery pack gas leakage can be prevented. A battery packhas a plurality of battery moduleseach including a plurality of cellsrespectively provided with a safety valve. The plurality of cellsincluded in each battery moduleare arranged such that safety-valve mounting wallsare oriented in the same direction. Each battery modulecomprises a gas duct membercovering all the safety valvesof the cellsincluded therein and forming a gas discharge pathbetween the gas duct memberand the safety-valve mounting walls, and a sealing memberfor hermetically sealing the gaps between each cell caseand the gas duct member

Battery module, battery pack, and method for producing the battery module

An object is to provide a sealed battery with reduced electric resistance from a power generation element to an external terminal of the battery and a method of manufacturing the same. A sealed batterycomprises a power generation elementincluding positive electrode plateseach having a positive electrode active material layer and negative electrode plateseach having a negative electrode active material layer, which are alternately arranged. The power generation elementis configured such that negative electrode lead portionsof the negative electrode platesare provided extending in a predetermined direction. Further, the sealed batteryincludes a battery casehousing the power generation element. This battery caseincludes a negative-electrode case membermade of an electrically conductive material and serving as a negative collector plate to which the negative electrode lead portionsare connected.

Sealed battery and method of manufacturing the sealed battery

A nickel-metal hydride storage battery is provided capable of suppressing an increase of discharge reserve of a negative electrode and preventing lowering of battery characteristics. A nickel-metal hydride storage batteryof the present invention comprises a battery main part (an electrode plate group, an electrolyte, and others), a casehousing this battery main part, and a safety valve devicehaving an excessive pressure preventing function for preventing excessive rise of the internal pressure in the caseby discharging gas from the casewhen the internal pressure in the caseexceeds a predetermined value. The safety valve deviceincludes a valve memberhaving a protruding wallforming a valve internal space C communicated with a release holeand has a hydrogen leakage function for allowing leakage of hydrogen gas in the caseout of the battery through the valve internal space C even when the internal pressure in the caseis the predetermined value or less.

Nickel-metal hydride storage battery

A sealed battery includes a metal case which functions as a connection terminal of one polarity and an electrode post which is mounted to the case in an insulated manner and functions as a connection terminal of the other polarity. A sealing section with electrical insulation properties is disposed between the electrode post formed from a hollow cylinder with one closed end and an electrode post through-hole provided in the case. A compression deformation section is produced by deforming the closed end of the electrode post radially outward, for compressing and sealing the sealing section, and for securing the electrode post to the case.

Sealed battery and method for manufacturing the same

A nickel-metal hydride storage battery is provided capable of suppressing changes in discharge reserve and charge reserve of a negative electrode to prevent lowering of battery characteristics for a long term. A nickel-metal hydride storage batteryof the present invention comprises a battery main part (an electrode plate group, an electrolyte, and others), a casehousing this battery main part, and a safety valve device. The safety valve deviceincludes a valve memberof a closed-end substantially cylindrical shape. This nickel-metal hydride storage batteryis arranged such that a hydrogen leak rate V(&#x3bc;l/h/Ah) of the battery having been charged and discharged and then charged to 60% SOC satisfies a relationship: 2&#x2266;V&#x2266;4, the hydrogen leak rate being per unit of battery capacity under an atmosphere at a battery temperature of 45&#xb0; C., and a reduced pressure of 10 kPa.

Nickel metal hydride storage battery with a safety valve for relieving excess gas pressure in the battery when the safety valve is open, the safety valve having a hydrogen-permeable valve member for allowing hydrogen-gas leakage therethrough when the safety valve is closed

A prismatic battery module includes a prismatic battery case having a plurality of prismatic cell cases connected to one another through separation walls, a planar electroconductive connector forming part of the separation wall between the cell cases, an electrode plate group arranged in each cell case, and an electrolyte placed in each cell case. Lead portions of positive electrode plates and negative electrode plates of the electrode plate group are directly connected to the electroconductive connector. The prismatic battery module requires fewer connection points and provides shorter electrical communication paths, thereby reducing internal resistance.

Prismatic battery module and method for manufacturing the same

Growing community of inventors

Toyohashi, Japan

Shinji Hamada