Abstract: A power storage apparatus includes bag-shaped separators. Each of the bag-shaped separators includes a first welded portion and a first non-welded portion. The first welded portion exists along a first edge of the bag-shaped separator and is formed by welding the surplus sections of the separator members together. In the first non-welded portion, the separator members are not welded together. The bag-shaped separator includes a second welded portion and a second non-welded portion. The second welded portion exists along a second edge and is formed by welding the surplus sections of the separator members together. The second non-welded portion is located closer to the second edge than the second welded portion. In the second non-welded portion, the separator members are not welded together. In the power storage apparatus, the width of the first non-welded portion>the width of the second non-welded portion.

Abstract: A power storage apparatus includes bag-shaped separators. Each of the bag-shaped separators includes a first welded portion and a first non-welded portion. The first welded portion exists along a first edge of the bag-shaped separator and is formed by welding the surplus sections of the separator members together. In the first non-welded portion, the separator members are not welded together. The bag-shaped separator includes a second welded portion and a second non-welded portion. The second welded portion exists along a second edge and is formed by welding the surplus sections of the separator members together. The second non-welded portion is located closer to the second edge than the second welded portion. In the second non-welded portion, the separator members are not welded together. In the power storage apparatus, the width of the first non-welded portion>the width of the second non-welded portion.

Abstract: A case of an electrical storage device includes a case body, a lid, and a welded portion at an abutting portion where the case body and the lid are abutting against each other. In a cross-sectional view of the case along its extending direction, the welded portion has an interface existing at a boundary of the welded portion with the case body and the lid. The maximum dimension from an exposed surface of the welded portion to the interface is defined as a weld depth X. The dimension from the abutting portion to an edge of the welded portion in a direction along the exposed surface of the welded portion is defined as a weld width Y. The welded portion is configured to exist over the entire circumference of the case in a shape that satisfies an expression Y/X>1.

Abstract: An electricity storage device includes an electrode assembly, a case, a first terminal, and a second terminal. The electrode assembly includes one or more first electrodes and one or more second electrodes, which are stacked alternately with one or more separators in between. The case accommodates the electrode assembly. The first terminal and the second terminal are located on a wall portion of the case. First tabs and second tabs are provided on ends of the first and second electrodes, respectively. A circuit breaker is arranged between the second terminal and the electrode assembly. A part of the first terminal and the first tabs are arranged along the width direction of the electrode assembly, and the circuit breaker and the second tabs are arranged along the width direction of the electrode assembly.

Abstract: An electricity storage device includes an electrode assembly, a case, a first terminal, and a second terminal. The electrode assembly includes one or more first electrodes and one or more second electrodes, which are stacked alternately with one or more separators in between. The case accommodates the electrode assembly. The first terminal and the second terminal are located on a wall portion of the case. First tabs and second tabs are provided on ends of the first and second electrodes, respectively. A circuit breaker is arranged between the second terminal and the electrode assembly. A part of the first terminal and the first tabs are arranged along the width direction of the electrode assembly, and the circuit breaker and the second tabs are arranged along the width direction of the electrode assembly.