Toyota Jidosha Kabushiki Kaisha

Panasonic Corporation

Other

Matsushita Electric Industrial Co., Ltd.

Panasonic Holdings Corporation

Sumitomo Metal Mining Company, Ltd.

Akihiro Taniguchi

Kaoru Inoue

Munehisa Ikoma

Nobuyasu Morishita

Noriyuki Fujioka

Shuji Tsutsumi

Shinji Hamada

Takashi Takeuchi

Ryosuke Ohsawa

Tatsuya Hashimoto

Hiroshi Inoue

Kensuke Nakura

Hiroya Umeyama

Hideki Sano

Takuma Iida

Keisuke Ohara

Yoshiaki Ogata

Takuya Nakashima

Koji Torita

Hiroki Iguchi

Kouhei Tsuzuki

Kazunari Ando

Takashi Hottori

Yusuke Fukumoto

Toyohiko Eto

Satoshi Matsumoto

Keiichi Takahashi

Akira Tsujiko

Kohei Suzuki

Toshihiko Ichinose

Toshiyuki Sekimori

Yuji Yokoyama

Kazuo Tojima

Hideaki Fujita

Yasuhiro Takahashi

Masayoshi Iwase

Naoto Sato

Shinichi Yuasa

Tomokazu Yamauchi

Katsunori Komori

Hiromi Kajiya

Hideo Sasaoka

Kozo Watanabe

Takashi Hattori

Takashi Ito

Mitsuhiro Takeno

Shoji Karasawa

Hiroshi Matsuno

Toshifumi Ueda

Takaya Saito

Akitoshi Hiramatsu

Yoshihiro Tokutome

Masaru Masaki

Gou Kashio

A secondary battery module includes a nonaqueous-electrolyte secondary battery and an elastic body, wherein a negative electrode constituting the nonaqueous-electrolyte secondary battery includes a negative-electrode active material layer, the negative-electrode active material layer includes a first layer, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer, a separator constituting the nonaqueous-electrolyte secondary battery has a lower compression modulus than the first layer, the elastic body has a lower compression modulus than the separator, the graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m/g, and the content of Si particles in the first layer is 6 mass % to 13 mass % relative to the total amount of the negative-electrode active material layer.

Nonaqueous-electrolyte secondary battery and secondary battery module

A secondary battery module according to the present embodiment includes a nonaqueous-electrolyte secondary battery and an elastic body, wherein a negative electrode constituting the nonaqueous-electrolyte secondary battery includes a negative-electrode current collector and a negative-electrode active material layer, the negative-electrode active material layer includes a first layer formed on the negative-electrode current collector, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer, a separator constituting the nonaqueous-electrolyte secondary battery has a lower compression modulus than the first layer, the elastic body has a lower compression modulus than the separator, a graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m/g, and the first layercontains 0.01 mass % to 0.4 mass % of a carbon nanotube having one to five graphene sheets.

A non-aqueous electrolyte secondary battery includes: a pressure-type current interrupt device arranged in a conductive path, for interrupting the conductive path when an internal pressure exceeds a working pressure; a non-aqueous electrolyte; and a positive electrode composite material layer. The non-aqueous electrolyte contains a gas generation agent that generates a gas in an overcharge region, and the positive electrode composite material layer contains a first positive electrode active material particle including lithium iron phosphate, and a second positive electrode active material particle including lithium-nickel composite oxide. A ratio of the first positive electrode active material particle to a total mass of the first positive electrode active material particle and the second positive electrode active material particle is 5% by mass or more and 20% by mass or less.

Non-aqueous electrolyte secondary battery

A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte solution. The negative electrode includes at least negative electrode active material particles. Each of the negative electrode active material particles contains at least a SiOparticle and a Si layer. The Si layer covers a surface of the SiOparticle. The Si layer has a thickness not smaller than 10 nm and not greater than 100 nm. The electrolyte solution contains at least one selected from the group consisting of FEC and VC.

Lithium-ion secondary battery and method of producing the same

A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte. The negative electrode includes at least a negative electrode active material and a polymer binder. The negative electrode active material includes at least a graphitic material and a silicon oxide material. The amount of acidic functional groups per unit surface area of graphitic material is not lower than 0.017 mmol/mand not higher than 0.086 mmol/m. A polymer binder contains a carboxy group. Polymer binder has a main chain with a length not smaller than 0.53 &#x3bc;m and not greater than 2.13 &#x3bc;m.

A non-aqueous electrolyte secondary battery includes at least a negative electrode composite material layer. The negative electrode composite material layer includes a negative electrode active material, a conductive material, and a binder. The negative electrode active material includes a silicon oxide material and a graphite material. The negative electrode composite material layer has a BET specific surface area not smaller than 3.5 m/g and not greater than 5.0 m/g. In an orthogonal coordinate system having an abscissa representing the elongation of the negative electrode composite material layer and an ordinate representing the electrical resistance of the negative electrode composite material layer, an elongation at a bending point (Cp) in the plot is 12% or higher.

Non-aqueous electrolyte secondary battery, method of evaluating negative electrode composite material layer, and method of producing non-aqueous electrolyte secondary battery

A lithium ion secondary battery, improved in durability against high-rate charging/discharging, which includes, in the negative electrode active material layer, a negative electrode active material formed of a graphite carbon material having a graphite structure in at least a part thereof, and a conductive carbon material, which is different from the graphite carbon material and is formed of a conductive amorphous carbon. The negative electrode active material has a bulk density of 0.5 g/cmor more and 0.7 g/cmor less, and a BET specific surface area of 2 m/g or more and 6 m/g or less. The conductive carbon material has a bulk density of 0.4 g/cmor less, and a BET specific surface area of 50 m/g or less.

Lithium ion secondary battery having a negative electrode active material formed of a graphite material and a conductive carbon material different from the graphite material

The negative electrode plate includes at least a negative electrode composite material layer. The negative electrode composite material layer has a density of 1.5 g/cmor more. The negative electrode composite material layer contains at least first particles, second particles and a binder. The first particles contain graphite particles and an amorphous carbon material. The amorphous carbon material is coated on the surface of each graphite particle. The second particles are made of silicon oxide. The ratio of the second particles to the total amount of the first particles and the second particles is 2 mass % or more to 10 mass % or less. The negative electrode plate has a spring constant of 700 kN/mm or more to 3000 kN/mm or less.

Negative electrode plate and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery includes a positive electrode composite material layer, the positive electrode composite material layer including: a composite particle including a positive electrode active material, a first conductive material and a binder; and a second conductive material arranged on a surface of the composite particle and having a DBP oil absorption number smaller than that of the first conductive material.

Non-aqueous electrolyte secondary battery and method for manufacturing the same

A method of manufacturing a non-aqueous electrolyte solution secondary battery includes: (A) preparing a first composite material by mixing a first positive electrode active material, a first conductive material and a first binder; (B) preparing a second composite material by mixing a second positive electrode active material, a second conductive material and a second binder; and (C) manufacturing a positive electrode by forming a positive electrode composite layer including the first composite material and the second composite material. The first positive electrode active material has an average discharge potential lower than that of the second positive electrode active material. The first conductive material has a first OAN. The second conductive material has a second OAN. A ratio of the second OAN to the first OAN is 1.3 or more and 2.1 or less. A sum of the first OAN and the second OAN is 31.64 ml/100 g or less.

Method of manufacturing non-aqueous electrolyte solution secondary battery and non-aqueous electrolyte solution secondary battery

A non-aqueous electrolyte secondary battery including: an electrode group in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween; and a non-aqueous electrolyte including a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent, the positive electrode including a positive electrode material mixture layer containing a nickel-containing lithium composite metal oxide, wherein a product of A and B equals 150 to 350, A equals 15 to 20%, and B equals 10 to 25%, where A (%) represents a porosity of the positive electrode material mixture layer, and B (%) represents a volume percentage of ethylene carbonate in the non-aqueous solvent.

A non-aqueous electrolyte secondary battery including: an electrode group in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween; and a non-aqueous electrolyte including a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent, the positive electrode including a positive electrode material mixture layer containing a nickel-containing lithium composite metal oxide, wherein a product of A and B equals 150 to 350, A equals 15 to 20%, and B equals 8 to 25%, where A (%) represents a porosity of the positive electrode material mixture layer, and B (%) represents a volume percentage of ethylene carbonate in the non-aqueous solvent.

A charge control circuit including a voltage detection section which detects a terminal voltage of a secondary battery; a primary charge processing section which performs a charge processing of acquiring, as a first terminal voltage, a terminal voltage detected by the voltage detection section while causing a charging section to charge the secondary battery; a charging suspend voltage acquiring section which causes the charging section to suspend the charge after the first terminal voltage has been acquired by the primary charge processing section, and acquires, as a second terminal voltage, a terminal voltage detected by the voltage detection section in a state that the charge is suspended; and a charging end determining section which determines whether or not the charge of the secondary battery is to be terminated.

Charge control circuit, and charging device and battery pack incorporated with the same

Provided is a deterioration determination circuit configured by including: an SOC detection unit for detecting an SOC of a secondary battery; an internal resistance detection unit for detecting an internal resistance value of the secondary battery; a first determination unit for determining the status of deterioration of the secondary battery based on the internal resistance value detected by the internal resistance detection unit when the SOC detected by the SOC detection unit is within a range of a pre-set first range; a second determination unit for determining the status of deterioration of the secondary battery based on the internal resistance value detected by the internal resistance detection unit when the SOC detected by the SOC detection unit is within a range of a pre-set second range as a range of an SOC, in which a variation of the internal resistance of the second battery in relation to a variation of the SOC of the secondary battery is different from the first range; and a final determination unit for ultimately determining that the secondary battery is deteriorated when the first determination unit determines that the secondary battery is of the deteriorated status and the second determination unit additionally determines that the secondary battery is of the deteriorated status.

Deterioration determination circuit, power supply apparatus, and deterioration determination method of secondary battery

A secondary-battery life estimation apparatus includes: a voltage measuring portion measuring a terminal voltage of a secondary battery to be measured; a first memory storing in advance a terminal voltage Vof a non-degraded secondary battery before the non-degraded secondary battery discharges after fully charged; a second memory which stores in advance a life-estimation data map as a look-up table associating a voltage difference dV between a terminal voltage V of the secondary battery to be measured before the secondary battery to be measured discharges after fully charged and the terminal voltage Vwith a residual life of the secondary battery to be measured; and a CPU calculating the voltage difference dV between the terminal voltage V measured by the voltage measuring portion before the secondary battery to be measured discharges after fully charged and the terminal voltage Vstored in the first memory and estimating the residual life of the secondary battery to be measured based on the life-estimation data map stored in the second memory using the voltage difference dV.

Secondary-battery life estimation apparatus and method

Growing community of inventors

Ashiya, Japan

Akihiro Taniguchi