Sanyo Electric Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Yoshihiro Shoji

Koji Nishio

Yasuyuki Kusumoto

Toshiyuki Nohma

Mikiya Yamasaki

Yasuyuki Harada

Yoshinori Matsuura

Ikuo Yonezu

Tadayoshi Tanaka

Reizo Maeda

Katsuhiko Shinyama

Yasuhiro Yamauchi

Naoya Nakanishi

Toyoki Fujihara

Kouichi Satoh

Atsuhiro Funahashi

Ryuji Ohshita

Yoshinori Kida

Katsunori Yanagida

Keisuke Minami

Kenji Nansaka

Atsushi Yanai

Yasutomo Taniguchi

Masahisa Fujimoto

Takayuki Hattori

Nobuhiro Furukawa

Takenori Kimura

Hiroyuki Akita

Takeshi Maeda

Maruo Kamino

Hiroshi Watanabe

Seiji Yoshimura

Shingo Tode

Hideki Kitao

Toshikazu Yoshida

Kazuyasu Fujiwara

Masatoshi Takahashi

Yuji Yamamoto

Yoshinori Yokoyama

Toshihiko Saito

Yoshifumi Magari

Noriyuki Yoshinaga

Koji Ueno

Hiroshi Nakajima

Hiroshi Kurokawa

Toshihiro Takada

Yoshito Chikano

Takao Inoue

Hironori Harada

Takuya Sunagawa

Hiroshi Inukai

Kazunari Ohkita

Takashi Kondou

Yusuke Itoh

Mayumi Uehara

Makoto Uesugi

Takumi Mishiro

Shin Fujitani

Tetsuya Matsuda

Naoki Ogawa

Eiji Okutani

Hiroyuki Fujimoto

Shigeki Matsuta

Daisuke Ikeda

Takaaki Ikemachi

Seiji Omura

Akira Kiyama

Masahide Miyake

Ryuta Morishima

Toshihiko Saitoh

Satoshi Yoshida

Noriyuki Miyazaki

Yoshinobu Okumura

Masahiro Iyori

Takeshi Yoshida

Kenji Inagaki

Toshio Yanagida

Hirofusa Tanaka

Shinichi Yamami

Tadashi Teranishi

Kazuhisa Takeda

Noboru Nakano

Koji Kita

Yuuji Yamamoto

Yoshiyuki Furukouji

Naoki Terada

The positive electrode substrate exposed portions or the negative electrode substrate exposed portions, or both, of an electrode assembly is split into two groups, and therebetween is disposed an intermediate member made of a resin material and holding one or more connecting conductive members. Collector members for the substrate exposed portions split into two groups is electrically joined by a resistance welding method to the substrate exposed portions split into two groups, together with the connecting conductive member(s) of the intermediate member. The resin material portion of the intermediate member protrudes, in the extension direction of the substrate exposed portions split into two groups, beyond the ends of the substrate exposed portions split into two groups and the ends of the collector member to a prismatic outer can. This structure enables enhanced resistance between the substrate exposed portions and the collector member and curbs variation in the welding strength.

Prismatic sealed secondary battery

A non-aqueous electrolyte secondary battery includes a pressure-sensitive current shut-off mechanism, wherein a positive electrode core body exposed portion is disposed at one end portion of a flat rolled electrode assembly, a negative electrode core body exposed portion is disposed at the other end portion, lithium carbonate is contained in a positive electrode mix layer, and a protective layer is disposed along the border with the positive electrode mix layer at the position opposite to a separator on the positive electrode core body exposed portion.

Nonaqueous electrolyte secondary battery

In a prismatic sealed secondary battery provided with an outer can made of a metal, the ability of inserting the electrode assembly into the outer can is improved to restrain the displacement and damages of the insulation member when inserting the electrode assembly into the outer can. The prismatic sealed secondary battery of the present invention includes an insulation member having a bottomed box shape which is a shape obtained by eliminating the upper surface from the surfaces of a hexahedron having a cuboid form, wherein each width of at least a pair of side surfaces facing each other in the insulation member is smaller than the width of the electrode assembly facing the pair of side surfaces.

Square-shaped sealed secondary battery and method of manufacturing same

A nonaqueous electrolyte secondary battery includes a pressure-sensitive current interrupt mechanism, and a flat wound electrode body that is inserted in an outer casing with a winding axis of the flat wound electrode body arranged to extend in a horizontal direction. A positive electrode plate, a negative electrode plate, and a separator in a winding end portion of the flat wound electrode body are all directed toward a top side.

Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery includes an external electrode terminal, a current collecting tab, a lead, and first and second insulating members. The lead has a hollow portion, electrically connecting the external electrode terminal and the diaphragm. The diaphragm is placed to cover the hollow portion and allow the diaphragm to deform toward the hollow portion. The first insulating member is interposed between the sealing plate and the lead. The second insulating member is interposed between the diaphragm and the current collecting tab. Side walls of the first insulating member and side walls of the second insulating member are coupled to each other. The battery is configured such that the diaphragm deforms toward the outside of the battery when a gas pressure increases in the battery, thereby breaking an electric connection between the external electrode terminal and an electrode assembly of the battery.

Disclosed is a non-aqueous electrolyte secondary cell excellent in capacity retention rate and I-V characteristics after repeated cycles. The secondary cell contains a negative electrode active material containing scaly graphite particles and coated graphite particles. The coated graphite particles contain graphite particles and a coating layer coating the surfaces of the graphite particles. The coating layer contains amorphous carbon particles and an amorphous carbon layer. It is preferable that the negative electrode active material contain 1 to 6% by mass of the scaly graphite particles and that the graphite particles, the amorphous carbon particles, and the amorphous carbon layer be in a mass ratio of 100:&#x3b1;:&#x3b2; where 1&#x2266;&#x3b1;&#x2266;10, 1&#x2266;&#x3b2;&#x2266;10, and &#x3b1;&#x2266;1.34&#x3b2;.

Non-aqueous electrolyte secondary cell containing negative active material including scaly graphite particles and graphite particles coated with amorphous carbon particles and amorphous carbon layer and method of manufacturing the same

A prismatic nonaqueous electrolyte secondary battery includes a flat winding electrode assembly formed by winding an elongated positive and negative electrodes with an elongated separator interposed therebetween, and an outer body storing the flat winding electrode assembly and a nonaqueous electrolyte. The positive electrode includes a positive electrode substrate exposed portion formed along a longitudinal direction. The negative electrode includes a negative electrode substrate exposed portion formed along a longitudinal direction. The nonaqueous electrolyte contains at least one of a lithium salt having an oxalate complex as an anion and lithium difluorophosphate (LiPFO) at the time of making the nonaqueous electrolyte secondary battery. The flat winding electrode assembly has eight or more layers of a winding portion formed only of the separator in its central portion. This battery can allow a nonaqueous electrolyte having a high viscosity to easily penetrate the inside of a flat winding electrode assembly.

A nonaqueous electrolyte secondary battery includes: an electrode assembly including positive and negative electrode plates; a nonaqueous electrolyte; an outer body; and a current interruption mechanism being provided on at least one of a conductive pathway between the positive electrode plate and a positive electrode external terminal and a conductive pathway between the negative electrode plate and a negative electrode external terminal. The nonaqueous electrolyte contains an overcharge inhibitor. The positive electrode active material layer has a specific surface area of 1.3 m/g or less. The positive electrode active material layer has a total surface area of 41 m/g or less with respect to the total mass of the overcharge inhibitor in the nonaqueous electrolyte. Thus the battery can increase a battery internal pressure inside the outer body in a short period of time to activate the current interruption mechanism to interrupt the conductive pathway if the battery is overcharged.

A prismatic secondary battery is provided with a negative/positive electrode collector (), which are disposed on either one of a wound negative/positive electrode substrate exposed portion (), and a negative/positive electrode collector receiving member () which is disposed on another surface. At least one of the negative/positive electrode collector has a recess portion () formed in part on a surface on the side not facing the negative/positive electrode substrate exposed portions so as to be thinner than the thickness of the other portion. Resistance welding is carried out in this recessed part, thereby a large welding nugget is formed between the negative/positive electrode exposed portion and the negative/positive electrode collector.

Prismatic secondary battery

A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes an electrode assembly, a nonaqueous electrolyte, and a container. The electrode assembly has a positive electrode, a negative electrode, and a separator. The positive electrode contains particles of a lithium transition metal compound as a positive electrode active material. The negative electrode is opposed to the positive electrode. The separator is disposed between the positive electrode and the negative electrode. The nonaqueous electrolyte contains lithium difluorophosphate. The container houses the electrode assembly and the nonaqueous electrolyte. The battery capacity is not less than 21 Ah. The mean particle diameter (D) of the particles of the lithium transition metal compound is not less than 5 &#x3bc;m and not more than 15 &#x3bc;m. The (D&#x2212;D)/Dof the particles of the lithium transition metal compound is under 1.1.

A sealed battery includes a sealing platesealing a mouth of an outer can, an external terminalattached to the sealing plateand having a connecting terminal, and a current interruption mechanisminterrupting current in response to pressure increase in the outer can that is installed in a conductive pathway electrically connecting the connecting terminaland an electrode assembly. In the connecting terminal, a through-holecontinuing to the space on the current interruption mechanismat the side corresponding to the outside of the battery is formed. The through-holeis sealed with a terminal stoppermade of an elastic member so as to form a closed space between the terminal stopperand current interruption mechanism. An electrolyte or washing solution hardly enters the current interruption mechanism during the manufacture can be provided.

Sealed battery and method for manufacturing the same

A positive electrode plate for a nonaqueous electrolyte secondary battery, the positive electrode plate including: a positive electrode substrate; a positive electrode active material layer formed on the positive electrode substrate; and a positive electrode substrate exposed portion on which the positive electrode active material layer is not formed, the positive electrode substrate exposed portion having a region that is adjacent to the positive electrode active material layer and has a protective layer formed thereon, the positive electrode active material layer and the protective layer containing polyvinylidene fluoride, and the weight average molecular weight Mw of the polyvinylidene fluoride contained in the protective layer being larger than the weight average molecular weight Mw of the polyvinylidene fluoride contained in the positive electrode active material layer. Thus, a high reliable nonaqueous electrolyte secondary battery where the widths of the positive electrode material and the protective layers are stable can be provided.

Positive electrode plate for nonaqueous electrolyte secondary battery, method for manufacturing the positive electrode plate, nonaqueous electrolyte secondary battery, and method for manufacturing the battery

Provided is a method of manufacturing a nonaqueous electrolyte secondary battery. The method includes: forming an electrode assembly including a positive electrode plate and a negative electrode plate disposed with a separator interposed therebetween; arranging the electrode assembly and a nonaqueous electrolyte containing LiBOB (lithium bis(oxalato)borate) and LiPFO(lithium difluorophosphate) inside an outer body; and configuring the concentration of the LiBOB to be larger than that of the LiPFOand to be smaller than that of the LiPFOby charge and discharge.

Method of manufacturing nonaqueous electrolyte secondary battery

Growing community of inventors

Kobe, Japan

Toshiyuki Nohma