Abstract: A battery includes: an electrode stack including a stack of electrodes, each including a current collector and an active material layer divided with channels in between; a sealing body that forms internal spaces holding electrolyte solution between current collectors and seals the internal spaces; and injection ports formed in sealing body and communicate internal spaces to the outside, wherein the internal spaces are formed by channels and uncoated regions around active material layers where active material layers are not provided, internal regions sealed by sealing body have polygonal shape when viewed from stacking direction of the electrode stack, the channels extend between divided regions of the active material layers from the side where the injection ports are in the opposite direction thereof, and cross-sectional area of regions of the uncoated regions that face surfaces where the injection ports are formed is larger than a cross-sectional area of the channels.

Abstract: A battery has an stack of electrodes including collectors and active material layers that are divided and between which grooves are provided; a sealing body forming, between the collectors, internal spaces in which electrolytic liquid is accommodated, and sealing the internal spaces; and injection ports in the sealing body and communicating the internal spaces and an exterior. The internal spaces are formed by the grooves and, at peripheries of the active material layers, uncoated regions at which the active material layers are not provided. An internal region sealed by the sealing body is a polygonal shape when viewed from a stacking direction of the electrode stack. The grooves extend from an injection port side in a direction opposite thereto, between the active material layers. At least grooves A and B having different widths are provided as the grooves, and groove A width is wider than groove B width.

Abstract: Provided is a technique capable of suppressing the occurrence of uneven drying inside an electrode body. A secondary battery disclosed herein includes an electrode body and a battery case. The battery case has a pair of rectangular wide surfaces and four rectangular side surfaces between the pair of wide surfaces. The electrode body is accommodated in the battery case, wherein rectangular surfaces of the electrode body face the wide surfaces of the battery case. The battery case is provided with protrusions inside, and the protrusions are in contact with at least a part of a central region including a center line in the long side direction of the rectangular surfaces of the electrode body accommodated in the battery case.

Abstract: A power storage cell includes a cell case and an electrode assembly. The cell case houses the electrode assembly. The cell case includes a top wall, a peripheral wall, and a bottom wall. The top wall faces the bottom wall. The peripheral wall connects the top wall and the bottom wall. The top wall is provided with an electrode terminal. A current path that electrically connects the electrode terminal and the electrode assembly is formed in the cell case. The current path includes a fuse portion. The power storage cell further includes at least one of a thermal expansion member and a thermal contraction member. The thermal expansion member is disposed between the top wall and the electrode assembly. The thermal contraction member is disposed between the electrode assembly and at least one of the peripheral wall and the bottom wall. The thermal contraction member supports the electrode assembly.

Abstract: A power storage cell includes a cell case, a wound electrode assembly, and an electrolyte solution. The cell case houses the wound electrode assembly and the electrolyte solution. The wound electrode assembly includes a positive electrode sheet, a separator sheet, and a negative electrode sheet. In a winding axis direction, the wound electrode assembly has a first end portion and a second end portion. The first end portion faces a top wall. The second end portion is located opposite to the first end portion. At both the first end portion and the second end portion, the separator sheet extends outward with respect to the negative electrode sheet. At the first end portion, the separator sheet has a first protruding length. At the second end portion, the separator sheet has a second protruding length. The first protruding length is longer than the second protruding length.

Abstract: A power storage cell comprises a cell case and an electrode assembly. The cell case accommodates the electrode assembly. The cell case includes an electrode terminal. An electric current path is formed inside the cell case. The electric current path electrically connects the electrode assembly with the electrode terminal. The electric current path includes a fuse portion. Tensile stress is applied to the fuse portion in a direction separating the fuse portion.

Abstract: Provided is a technique capable of improving impregnation efficiency of a nonaqueous electrolyte into an electrode body. A manufacturing method herein disclosed includes producing a negative pressure in an inside of a battery case; introducing a nonaqueous electrolyte into the inside of the battery case; establishing communication between the inside of the battery case and external atmosphere; temporarily sealing a solution introduction port using a first sealing member, impregnating the electrode body with a nonaqueous electrolyte; opening the solution introduction port; and, sealing the solution introduction port using a second sealing member. Herein, the first sealing member includes an air permeable film. Air permeation is enabled between the inside of the battery case after the temporary sealing and external atmosphere. The permeability of a vapor derived from the nonaqueous electrolyte with respect to the film is smaller than the permeability of water vapor.

Abstract: Provided is a technique capable of suppressing the occurrence of uneven drying inside an electrode body. A secondary battery disclosed herein includes an electrode body and a battery case. The battery case has a pair of rectangular wide surfaces and four rectangular side surfaces between the pair of wide surfaces. The electrode body is accommodated in the battery case, wherein rectangular surfaces of the electrode body face the wide surfaces of the battery case. The battery case is provided with protrusions inside, and the protrusions are in contact with at least a part of a central region including a center line in the long side direction of the rectangular surfaces of the electrode body accommodated in the battery case.

Abstract: Provided is a technique capable of suppressing the occurrence of uneven drying inside an electrode body. The manufacturing method disclosed herein is for manufacturing a secondary battery comprising an electrode body and a battery case. The method comprises the steps of: accommodating the electrode body in the battery case to produce a battery assembly; arranging a gripping tool on the outside of the battery case of the battery assembly and gripping the battery assembly with the gripping tool; and drying the inside of the battery assembly, wherein the battery assembly is gripped and heated. In the gripping, a larger restraining pressure is applied to a central region of a rectangular surface of the electrode body than to other regions.

Abstract: Provided is a technique capable of improving impregnation efficiency of a nonaqueous electrolyte into an electrode body. A manufacturing method herein disclosed includes producing a negative pressure in an inside of a battery case; introducing a nonaqueous electrolyte into the inside of the battery case; establishing communication between the inside of the battery case and external atmosphere; temporarily sealing a solution introduction port using a first sealing member, impregnating the electrode body with a nonaqueous electrolyte; opening the solution introduction port; and, sealing the solution introduction port using a second sealing member. Herein, the first sealing member includes an air permeable film. Air permeation is enabled between the inside of the battery case after the temporary sealing and external atmosphere. The permeability of a vapor derived from the nonaqueous electrolyte with respect to the film is smaller than the permeability of water vapor.