Toyota Jidosha Kabushiki Kaisha

Koji Umemura

Ryo Kanada

Junta Katayama

Yuki Okamoto

Isao Takahashi

Kengo Iwakura

Akemi Nakatake

A cell pack including: a plurality of unit cells arranged in an arrangement direction, each unit cell including a cell case accommodating an electrode body and an electrolytic solution; and a spacer disposed between two unit cells adjacent to each other in the arrangement direction. The cell case has a side surface facing the spacer. At least one of the side surfaces has a pressing region pressed by the spacer and a non-pressing region not pressed by the spacer. An expanding portion bulging in a direction of approaching the spacer is provided in the non-pressing region of the cell case, and a gap between the cell case and the spacer is reduced by the expanding portion.

Cell pack and method for producing unit cell for use in cell pack

A control device calculates an amount of increase &#x394;Am in freezing temperature measurement value Am from an initial freezing temperature &#x394;and calculates an amount of lowering in capacity corresponding to the amount of increase &#x394;Am in freezing temperature as an amount of lowering in capacity &#x394;Bx due to deterioration of a material. The control device calculates an amount of lowering in capacity measurement value Bm from an initial capacity Bas a whole amount of lowering in capacity &#x394;Bm and calculates a material deterioration ratio X by using &#x394;Bx and &#x394;Bm. The control device calculates a value resulting from subtraction of &#x394;Bx from &#x394;Bm as an amount of lowering in capacity &#x394;By due to precipitation of Li and calculates an Li precipitation deterioration ratio Y by using &#x394;By and &#x394;Bm.

Apparatus and method of estimating state of lithium ion battery

A battery pack includes a first unit battery, a second unit battery, and a spacer. The first unit battery includes a wound electrode body and a casing that accommodates an electrolyte solution. The spacer includes: a primary surface that faces the first unit battery; and plural projections, each of which is projected from the primary surface. The plural projections include: a first projection that abuts the casing in a state where the casing is not expanded; and a second projection, a height of which is lower than a height of the first projection.

Growing community of inventors

Okazaki, Japan

Koji Umemura