Abstract: A control apparatus controlling discharge of a secondary battery such that a discharge power of the secondary battery does not exceed an upper limit value has a current sensor and a controller. The current sensor detects a current value during charge and discharge of the secondary battery. The controller calculates an evaluation value for determining a first deterioration component depending on nonuniformity of an ion concentration in an electrolyte of the secondary battery by using the detection result of the current sensor, and reduces the upper limit value when the integral value of the evaluation values exceeding a target value exceeds a threshold value. The controller estimates a second deterioration component depending on the material of the secondary battery and changes the threshold value such that deterioration due to the first deterioration component is permitted in association with the second deterioration component.

Abstract: A control apparatus controlling discharge of a secondary battery such that a discharge power of the secondary battery does not exceed an upper limit value has a current sensor and a controller. The current sensor detects a current value during charge and discharge of the secondary battery. The controller calculates an evaluation value for determining a first deterioration component depending on nonuniformity of an ion concentration in an electrolyte of the secondary battery by using the detection result of the current sensor, and reduces the upper limit value when the integral value of the evaluation values exceeding a target value exceeds a threshold value. The controller estimates a second deterioration component depending on the material of the secondary battery and changes the threshold value such that deterioration due to the first deterioration component is permitted in association with the second deterioration component.

Abstract: A battery includes a casing made of metal; and a safety valve made of a thin plate. The casing includes a vent hole that provides communication between the inside of the battery and the outside of the battery. A seal member made of synthetic resin is provided between the peripheral edge portion around the vent hole and the peripheral edge portion of the safety valve. The seal member connects the peripheral edge portion around the vent hole to the peripheral edge portion of the safety valve such that the peripheral edge portion around the vent hole does not contact the peripheral edge portion of the safety valve.

Abstract: A battery includes a casing made of metal; and a safety valve made of a thin plate. The casing includes a vent hole that provides communication between the inside of the battery and the outside of the battery. A seal member made of synthetic resin is provided between the peripheral edge portion around the vent hole and the peripheral edge portion of the safety valve. The seal member connects the peripheral edge portion around the vent hole to the peripheral edge portion of the safety valve such that the peripheral edge portion around the vent hole does not contact the peripheral edge portion of the safety valve.

Abstract: A secondary battery includes cells that include a shaft, a battery case, a positive electrode sheet, a negative electrode sheet, a separator sheet, and electrolytic solution. An edge portion of the positive electrode sheet in the cell is overlapped and joined with an edge portion of the negative electrode sheet in the adjacent cell.