A lead alloy that is difficult to cause extension even when force is applied to the lead alloy is described. The half width of a (311) diffraction peak in a diffraction chart obtained by analyzing the lead alloy using an X-ray diffraction method is 1.4 or more times the half width of a (311) diffraction peak in a diffraction chart obtained by analyzing powder of pure lead using the X-ray diffraction method.

A bipolar storage battery includes a bipolar electrode including a positive electrode, a negative electrode, and a bipolar plate provided with a positive electrode on one surface and a negative electrode on an other surface. The bipolar plate has a communication hole communicating the one surface and the other surface. A positive current collector and a negative current collector are electrically joined through the communication hole. A partition is provided in the space between an inner surface of the communication hole and a joint portion between the positive current collector and the negative current collector. This arrangement provides a bipolar lead-acid storage battery that prevents an electrolytic solution from reaching a negative electrode side as much as possible to greatly suppress the occurrence of liquid junction even when the electrolytic solution enters communication holes, so that the battery performance is less likely to deteriorate.

A bipolar storage battery includes a bipolar electrode including a positive electrode, a negative electrode, and a bipolar plate provided with a positive electrode on one surface and a negative electrode on an other surface. The bipolar plate has a communication hole communicating the one surface and the other surface. A positive current collector and a negative current collector are electrically joined through the communication hole. A partition is provided in the space between an inner surface of the communication hole and a joint portion between the positive current collector and the negative current collector. This arrangement provides a bipolar lead-acid storage battery that prevents an electrolytic solution from reaching a negative electrode side as much as possible to greatly suppress the occurrence of liquid junction even when the electrolytic solution enters communication holes, so that the battery performance is less likely to deteriorate.

A bipolar storage battery includes a bipolar electrode including a positive electrode, a negative electrode, and a substrate provided with the positive electrode on one surface and the negative electrode on another surface. The bipolar storage battery includes a first adhesive provided between the one surface of the substrate and the positive electrode to bond the positive electrode to the substrate. The first adhesive is a conductive adhesive. This configuration can provide a bipolar storage battery in which battery performance is less likely to deteriorate by preventing an electrolytic solution from easily infiltrating an interface between a positive electrode and an adhesive layer even when growth occurs in the positive electrode due to corrosion by sulfuric acid contained in the electrolytic solution.

A bipolar storage battery includes a bipolar electrode including a positive electrode, a negative electrode, and a substrate provided with the positive electrode on one surface and the negative electrode on another surface. The bipolar storage battery includes a first adhesive provided between the one surface of the substrate and the positive electrode to bond the positive electrode to the substrate. The first adhesive is a conductive adhesive. This configuration can provide a bipolar storage battery in which battery performance is less likely to deteriorate by preventing an electrolytic solution from easily infiltrating an interface between a positive electrode and an adhesive layer even when growth occurs in the positive electrode due to corrosion by sulfuric acid contained in the electrolytic solution.

A liquid-type lead storage battery includes a positive electrode collector formed of a lead alloy having a rolled structure. A grid substrate of the collector has an upper frame bone located on the upper side and a lower frame bone located on the lower side, each extending laterally, and a pair of vertical frame bones extending vertically. A lug projects upward from a position shifted to the side close to either one of the pair of vertical frame bones from the longitudinal center of the upper frame bone. The intermediate bones have vertical intermediate bones from the upper to lower frame bone and lateral intermediate bones connecting the pair of vertical frame bones. At least one of the lateral intermediate bones has a cross-sectional area B larger than an average value A of the cross-sectional areas of the plurality of lateral intermediate bones, such that B/A is 1.15 or more.

A lead-acid battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution, in which the positive electrode plate includes a positive current collector and a positive electrode material, the negative electrode plate includes a negative current collector and a negative electrode material, the positive current collector contains Sn in an amount of 0.95% by mass or more, the negative electrode material contains a polymer compound, and the polymer compound has a peak in a range of 3.2 ppm or more and 3.8 ppm or less in a chemical shift of .sup.1H-NMR spectrum, or the polymer compound contains a repeating structure of oxy C.sub.2-4 alkylene units.

Provided is a bipolar storage battery in which an electrolytic solution is less likely to enter the interface between a positive electrode and an adhesive layer. Thus, battery performance is less likely to be reduced even if growth occurs in the positive electrode due to corrosion by sulfuric acid contained in the electrolytic solution. The bipolar storage battery includes a bipolar plate including a support column configured to support adjacent plates to each other when stacked, a positive current collector bonded to one surface of the bipolar plate by an adhesive, a positive active material layer placed on the positive current collector, a negative current collector bonded to another surface of the bipolar plate by an adhesive, a negative active material layer placed on the negative current collector, and a cover plate covering a peripheral edge portion of the positive current collector.

Provided is a bipolar storage battery in which an electrolytic solution is less likely to enter the interface between a positive electrode and an adhesive layer. Thus, battery performance is less likely to be reduced even if growth occurs in the positive electrode due to corrosion by sulfuric acid contained in the electrolytic solution. The bipolar storage battery includes a bipolar plate including a support column configured to support adjacent plates to each other when stacked, a positive current collector bonded to one surface of the bipolar plate by an adhesive, a positive active material layer placed on the positive current collector, a negative current collector bonded to another surface of the bipolar plate by an adhesive, a negative active material layer placed on the negative current collector, and a cover plate covering a peripheral edge portion of the positive current collector.

A bipolar storage battery includes a bipolar electrode including a positive electrode, a negative electrode, and a bipolar plate provided with the positive electrode on one surface and the negative electrode on another surface. The bipolar storage battery includes an adhesive provided between the one surface of the bipolar plate and the positive electrode to bond the positive electrode to the bipolar plate, and the adhesive is a liquid gasket. This configuration can provide a bipolar storage battery in which, even if corrosion by sulfuric acid contained in an electrolytic solution causes a growth in a positive electrode, the electrolytic solution is prevented from easily entering each part such as an interface between the positive electrode, an adhesive, and a communication hole, and battery performance is less likely to deteriorate.