Toyota Jidosha Kabushiki Kaisha

Prime Planet Energy & Solutions, Inc.

Tetsuya Mimura

Yuki Takahashi

Katsushi Enokihara

Masanori Kitayoshi

Atsushi Sugihara

Kota Ohata

Kouji Yamashiro

Shou Ishiyama

Jun Izumi

Nana Kurashita

Kenichi Kakishita

A method for manufacturing an electrode is provided, the method including coating and drying of an electrode paste and being able to highly suppress variations in the weight per unit area of the active material layer. The method for manufacturing an electrode disclosed herein includes the steps of: coating an electrode paste onto a current collecting foil from a die; and drying the coated electrode paste. Here, the current collecting foil is conveyed by a backup roll. A variation in at least one of thickness and width of the coated electrode paste is measured. The peripheral speed of the backup roll is changed according to a measurement result of the variation so that the variation becomes small.

Method for manufacturing electrode and electrode paste coating device

According to the present disclosure, an electrode having an electrode mixture layer with a desired film thickness can be stably produced. An electrode production apparatus disclosed herein includes: a first roll; a second roll; third roll; a rolling gap for rolling an electrode material to form a mixture coated film, formed between the first roll and the second roll; and a compression bonding gap for compressedly bonding the mixture coated film and an electrode current collector, formed between the second roll and the third roll. The electrode production apparatus further includes a spring-like mechanism configured to bias the third roll toward the second roll. The compression bonding gap fluctuates in response to the fluctuation of the reaction force from the mixture coated film. As a result, the film thickness variation of the electrode mixture layer after the production can be reduced.

Electrode production apparatus

According to the present disclosure, an electrode having an electrode mixture layer with a desired film thickness can be stably produced. A producing method disclosed herein includes detecting the surface position of a mixture coated film by a first sensor; detecting the surface position of a second roll by a second sensor; detecting the film thickness of the mixture coated film based on detection results of the first sensor and the second sensor; and adjusting a relatively rotation speed of a third roll based on the film thickness. And, the detected positions of the first sensor and the second sensor in a circumferential direction of the second roll are substantially identical. Due to this method, the change in the film thickness of the electrode mixed layer of produced electrode can be suppressed.

Method for producing electrode

A method for manufacturing an electrode disclosed herein includes: steps of forming a coating film composed of an electrode material by passing the electrode material through a gap between a rotating first roll and a rotating second roll; adhering the coating film to the second roll and conveying the coating film; and transferring the conveyed coating film onto an electrode current collector conveyed by a conveying device to form an electrode mixture layer composed of the coating film. The speed ratio between a peripheral speed of the second roll and a conveying speed of the electrode current collector is changed by changing the peripheral speed of the second roll on the basis of the thickness of the coating film or the width of the gap. The timing of the change in the speed ratio is allowed to be based on the Equation (1) described in the description.

Method for manufacturing electrode and apparatus for manufacturing electrode

Growing community of inventors

Chiryu, Japan

Tetsuya Mimura