Panasonic Holdings Corporation

Toyota Jidosha Kabushiki Kaisha

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Energy Co., Ltd.

Prime Planet Energy & Solutions, Inc.

Kouhei Tsuzuki

Katsunori Yanagida

Yuki Morikawa

Hirokazu Wada

Kaoru Inoue

Harunari Shimamura

Hideki Sano

Akihiro Taniguchi

Hiroki Iguchi

Yo Kato

Kaori Ishikawa

Yuta Matsuo

Hiroki Nagai

Tetsuji Omura

Keisuke Ohara

Goro Fujita

Daisuke Ito

Yasunori Baba

Yoshitaka Minamida

Akihiko Takada

Takuya Asari

Koichiro Isobe

Takaaki Matsui

Takafumi Nose

Kohei Masai

Koji Fujinaga

A battery module includes a pair of secondary batteries disposed adjacent to each other and a spacer disposed between the secondary batteries. Each of the secondary batteries includes a plurality of electrodes each of which has a rectangular shape and is disposed to face each other, a case configured to house the electrodes, the case having a rectangular parallelepiped shape, and an electrolyte in the case. The spacer is made of an elastic body. An aspect ratio of each of the electrodes is 10 or less, and a spring constant of the spacer is 0.03 MPa/mm or more and 5.4 MPa/mm or less.

Battery module

A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and a styrene-butadiene rubber, and the glass transition temperature (Tg) of the styrene-butadiene rubber in an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector is higher than that of the styrene-butadiene rubber in an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer.

Negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A negative electrode for a nonaqueous electrolyte with a negative electrode mixture layer that includes a first layer and a second layer. The first layer is formed on the negative electrode current collector and includes a negative electrode active material and a first binding agent. The negative electrode active material in the first layer includes a carbon material A and a Si-containing compound. The first binding agent includes polyacrylic acid or a salt thereof. The second layer is formed on the first layer and includes a negative electrode active material and a second binding agent. The negative electrode active material in the second layer includes a carbon material B. The carbon material B has a tap density higher than a tap density of the carbon material A. A packing density of the second layer is lower than a packing density of the first layer.

Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and carboxymethyl cellulose, wherein the molecular weight of the carboxymethyl cellulose in an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer is smaller than that of the carboxymethyl cellulose in an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector.

A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and polyvinylpyrrolidone, and an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector has a higher polyvinylpyrrolidone content than an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer.

In a nonaqueous electrolyte secondary battery, a negative electrode mix layer includes a first layer and a second layer disposed successively from a negative electrode collector. The first layer contains a first carbon-based active material having a 10% compressive strength of 3 MPa or less and a silicon-based active material containing Si. The second layer contains a second carbon-based active material having a 10% compressive strength of 5 MPa or more and has a lower content (mass ratio) of the silicon-based active material than the first layer.

Negative electrode including first layer having low compressive strength carbon active material and silicon active material and second layer having high compressive strength carbon active material and nonaqueous electrolyte secondary battery including the same

The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The nonaqueous electrolyte secondary battery includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode collector containing Ti as a main component and having a thickness of 1 &#x3bc;m to 8 &#x3bc;m. The negative electrode includes a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains negative electrode active material particles containing first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains negative electrode active material particles containing second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

Nonaqueous electrolyte secondary battery and secondary battery module

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.

An advantage of the present invention is to suppress an increase in resistance during high-rate charge and discharge and a reduction in capacity during a charge and discharge cycle. An electrical storage module of the present embodiment includes: an electrical storage device, and an elastic body that is placed with the electrical storage device and receives a load from the electrical storage device in a placement direction. The electrical storage device includes a positive electrode, a negative electrode, and a separator. The negative electrode includes 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. The separator has a lower compression modulus than the first layer, and the elastic body has a lower compression modulus than the separator.

Electrical storage device and electrical storage module

The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The positive electrode includes a positive electrode collector with a thermal conductive rate of 65 W/(m&#xb7;K) to 150 W/(m&#xb7;K). The negative electrode includes a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

Growing community of inventors

Hyogo, Japan

Kouhei Tsuzuki