Toyota Jidosha Kabushiki Kaisha

Takayuki Hojo

Masato Kamiya

Tetsuya Kaneko

Akira Kiyama

Masaru Ishii

Shinobu Okayama

Katsuhiko Nagaya

Norihiro Yamada

A method for generating smoke in a cell pack by which a very small amount of smoke can be generated from a specific single unit cell among unit cells constituting the cell pack. The method causes smoke generation in a cell pack in which unit cells are connected and which includes a positive electrode output terminal for electrically connecting the positive electrode terminal of the unit cell and an external device, and a negative electrode output terminal for electrically connecting the negative electrode terminal of the unit cell and an external device. By attaching a heating means to the negative electrode output terminal, the electrode body of a specific single unit cell is heated through the negative electrode output terminal to which the heating means is attached. As a result, it is possible to cause the generation of a small amount of smoke from the specific single unit cell.

Method for generating smoke in cell pack

An all-solid-state battery includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. The solid electrolyte layer separates the positive electrode layer and the negative electrode layer. The negative electrode layer includes a first layer and a second layer. The second layer is interposed between the solid electrolyte layer and the first layer. The first layer contains a first particle group. The second layer contains a second particle group. The first particle group and the second particle group contain a silicon material. The second particle group has a smaller average particle diameter than the first particle group.

All-solid-state battery with improved high-rate charging resistance

An assembled battery disclosed here includes a plurality of single cell array units each including single cells that are arranged in a lamination direction of a positive electrode and a negative electrode of an electrode body as an arrangement direction. The single cell array units are disposed parallel to each other such that arrangement directions of the single cells constituting the units are parallel to each other. Then, in the assembled battery, none of the single cells included in each of the single cell array units is directly electrically connected to adjacent single cells in the same unit, but is directly electrically connected to any one of the single cells constituting another single cell array unit through a bus bar.

Assembled battery

According to one aspect of the present invention, a short circuit inspection method for an all solid battery assembly is provided which includes: a step of preparing an all-solid-state battery assembly; a step of preparing a restraint jig including a pair of restraint plates sandwiching the all-solid-state battery assembly in the thickness direction, and a restraint member including a bolt and a nut, wherein where a smallest thermal expansion coefficient among the thermal expansion coefficient of the positive electrode current collector and the thermal expansion coefficient of the negative electrode current collector of the all-solid-state battery assembly is denoted by &#x3b1;1, the thermal expansion coefficients of the bolt and the nut are each equal to or greater than &#x3b1;1; a step of restraining the all-solid-state battery assembly; a step of increasing the resistance of the all-solid-state battery assembly by cooling; a step of applying a voltage to the all-solid-state battery assembly and measuring a current; and a step of determining whether or not a short circuit has occurred in the all-solid-state battery assembly on the basis of the measured current value.

Short circuit inspection method for all-solid-state battery assembly, restraint jig used therefor, kit for short circuit inspection, and method for manufacturing all-solid-state battery

A method for testing an all solid state battery with which the presence of short circuit or the presence of defect causing short circuit can be detected with high accuracy by a method in which a voltage is applied to a battery and the current value thereof is measured. The method includes the steps of: a resistance increasing step of increasing resistance of an all solid state battery to 3.2*105 &#x3a9;&#xb7;cm2 or more; a voltage applying step of applying voltage to an all solid state battery of which the resistance is increased; and a judging step of judging acceptability of the all solid state battery based on a current value measured in the voltage applying step.

Method for testing all solid state battery, method for producing all solid state battery, and method for producing battery pack

A battery pack includes a plurality of unit cells, each including an electrode body having a structure in which a positive electrode and a negative electrode are stacked, and a busbar that electrically connects a positive electrode terminal to a negative electrode terminal between the unit cells. The unit cells are stacked adjacent to one another in the same direction as a direction in which the positive electrode and the negative electrode of the electrode body are stacked. The busbar electrically connects the unit cells disposed apart from each other among the unit cells excluding the unit cells disposed adjacent to each other.

Battery pack

There is provided an assembled battery including a plurality of single cells and a plurality of bus bars connecting the plurality of single cells in series. The plurality of single cells is arranged such that a pair of flat side surfaces faces each other. The single cells each include a battery case, a positive electrode sheet, a negative electrode sheet, a positive electrode terminal, a negative electrode terminal, an electrical resistor disposed in a conductive path between the positive electrode sheet and the positive electrode terminal, and a pressure operative type current interruption mechanism disposed in a conductive path between the negative electrode sheet and the negative electrode terminal.

Growing community of inventors

Nagoya, Japan

Takayuki Hojo