Toyota Jidosha Kabushiki Kaisha

Yuya Ishihara

Tetsuya Kaneko

Kensaku Miyazawa

Shinichi Hamasaki

Akihiro Ochiai

Ayumu Kamakura

Jumpei Terashima

A method of evaluating a power storage device includes at least [a] to [f] below. [a] A power storage device is prepared. [b] A charge level of the power storage device is adjusted to produce a first potential difference between a positive electrode and a negative electrode. [c] The positive electrode or the negative electrode is selected as a reference electrode. [d] After the charge level is adjusted, an operation to insert a conductive rod-shaped member into a stack portion along a direction of stack of the positive electrode and the negative electrode is performed while a second potential difference between the reference electrode and the rod-shaped member is measured. [e] The rod-shaped member is stopped. [f] The power storage device is evaluated based on a state of the power storage device after the rod-shaped member is stopped.

Method of evaluating power storage device, method of manufacturing power storage device, and test system

A method of evaluating an all-solid-state battery includes preparing the all-solid-state battery. A charge level of the all-solid-state battery is adjusted to produce a first potential difference between a positive electrode and a negative electrode. The positive electrode or the negative electrode is selected as a reference electrode. After the charge level is adjusted, an operation to insert a conductive rod-shaped member into a stack portion along a direction of stack of the positive electrode and the negative electrode is performed while a second potential difference between the reference electrode and the rod-shaped member is measured. The rod-shaped member is stopped. The all-solid-state battery is evaluated based on a state of the all-solid-state battery after the rod-shaped member is stopped.

(a) A power storage device is prepared. (b) An evaluation jig is prepared. The evaluation jig includes an insulating tubular member and a conductive needle-shaped member. (c) A charge level of the power storage device is adjusted. (d) A positive electrode or a negative electrode is selected as a reference electrode. (e) An operation to insert the evaluation jig into the power storage device is performed. (f) The insertion operation is controlled to stop the tubular member when a tip end of the needle-shaped member comes in contact with an electrode different from the reference electrode. (g) Short-circuiting through the needle-shaped member is caused. (h) The power storage device is evaluated based on a state of the short-circuiting power storage device.

Method of evaluating power storage device, evaluation jig, and method of manufacturing power storage device

A battery pack spacer is divided into a first region and a second region, the first region includes an end portion in a first direction and occupies half of an entire region of the spacer in a second direction from the end portion in the first direction, the second region includes an end portion in the second direction and occupies half of the entire region of the spacer in the first direction from the end portion in the second direction, and the second region has higher compressibility in the single cell arrangement direction than the first region.

Battery pack spacer

A non-aqueous electrolyte secondary battery includes: a positive electrode plate; a negative electrode plate; and a separator disposed between the positive electrode plate and the negative electrode plate. The separator includes a porous resin layer. The porous resin layer is made of polyolefin having a melting point of 80&#xb0; C. or more and 135&#xb0; C. or less. At least one of the positive electrode plate and the negative electrode plate has a surface facing the porous resin layer. The surface forms a contact angle of 30&#xb0; or more with a molten droplet of the polyolefin.

Growing community of inventors

Miyoshi, Japan

Yuya Ishihara