Battery comprising a liquid inlet for electrolyte injection

摘要

A battery includes a winding electrode body, a battery case provided with a liquid inlet and positive and negative terminal members. The positive terminal member has a junction part compressed in a direction orthogonal to a winding axis direction. The negative terminal member has a junction part compressed in the direction orthogonal to the winding axis direction. The liquid inlet is positioned leaning to either the positive terminal junction part or the negative terminal junction part. In the winding electrode body, a separation distance from the junction part further away from the liquid inlet to the end lying on the relevant junction side in the winding axis direction is greater than a separation distance from the junction part closer to the liquid inlet to the end on the relevant junction side in the winding axis direction.

主权项

1. A battery comprising:
a wound electrode body including:
a positive electrode sheet that includes a foil-shaped positive current collecting part having surfaces formed with positive active material layers;a negative electrode sheet that includes a foil-shaped negative current collecting part having surfaces formed with negative active material layers;separators insulating the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the negative electrode sheet and the separators being wound together;a positive end part on one end side in a winding axis direction, the positive end part being formed of a positive active material layer unformed portion of the positive electrode sheet, the positive active material layer unformed portion having no coating of the positive active material layers, and being wound in a protruding state from the negative electrode sheet; anda negative end part on another end side in the winding axis direction, the negative end part being formed of a negative active material layer unformed portion of the negative electrode sheet, the negative active material layer unformed portion having no coating of the negative active material layers, and being wound in a protruding state from the positive electrode sheet, a battery case housing the wound electrode body; a liquid inlet provided in the battery case and used to inject electrolyte solution in the battery case therethrough; and a positive terminal member and a negative terminal member each joined to the wound electrode body, wherein
the positive end part includes a positive terminal junction part compressed in a direction perpendicular to the winding axis direction and joined with the positive terminal member;the negative end part includes a negative terminal junction part compressed in the direction perpendicular to the winding axis direction and joined with the negative terminal member;the liquid inlet is located in a position closer to either one of the positive terminal junction part or the negative terminal junction part; andthe wound electrode body is configured such that a separation distance between (i) the one of the positive terminal junction part or the negative terminal junction part further away from the liquid inlet and (ii) an end of the wound electrode body on a junction part side further away from the liquid inlet in the winding axis direction is greater than a separation distance between (i) the one of the positive terminal junction part or the negative terminal junction part closer to the liquid inlet, and (ii) an end of the wound electrode body on a junction part side closer to the liquid inlet in the winding axis direction.