Patent ID: 7244528

Claim:
An aluminum negative electrode battery comprising: an outer casing: a power generating element case inserted in the outer casing; a power generating element provided in the power generating element case and including a positive electrode mixture, a negative electrode gel and a separator provided between the positive electrode mixture and the negative electrode gel, the negative electrode gel containing an aqueous electrolyte and an active material containing at least one of aluminum and aluminum alloy; a negative electrode gasket provided in an opening of the outer casing: a negative electrode current collector rod inserted into the negative electrode gasket and the negative electrode gel; a water repellent member which permeates hydrogen gas, and is provided between the negative electrode gasket and an inner wall of the opening of the power generating element case and faces at least one part of the negative electrode gel, the separator and the positive electrode mixture, the water repellent member being at least one hydrogen gas permeable sheet having a water repellence of 2 kPa or more and a He gas permeability in a range of 2×10 −6 to 10000×10 −6 (cm 3 (STP)cm/sec·cm 2 ·cmHg) at 30° C.; and an air chamber provided between the water repellent member and the power generating element and having a volume of 30% or less of an inner volume of the power generating element case.