The present invention relates to a method for improving the operational efficiency of a battery pack (100) comprising at least two battery modules (10, 10′, 10″), wherein each battery pack is configured to have a common gas space (29). The method comprises the steps of: obtaining data (101) on the battery modules (10, 10′, 10″), wherein the data relates to the number of battery cells per battery module, the number of battery modules, the temperature of each battery module and the energy capacity of the battery modules; obtaining (102) an indication of the internal resistance (R.sub.i1, R.sub.i2, R.sub.i3) for the battery modules; determining (104), in case a difference in indication parameters between any of the battery modules exceeds a first threshold value, a filling amount of oxygen to be filled into the battery pack; and initiating (107) filling of the battery pack based on the determined filling amount of oxygen.

The present disclosure relates to a method for manufacturing a secondary battery including a gel polymer electrolyte and a secondary battery obtained thereby. The method can inhibit thermal crosslinking of a gel polymer electrolyte during the wetting with an electrolyte, and facilitate thermal crosslinking after the wetting with an electrolyte is finished. In addition, the method can increase uniformity of thermal crosslinking by controlling the oxygen content in a cell.

Provided is a secondary battery including a power generation unit including a positive electrode layer, a negative electrode layer, a porous separator, and an electrolytic solution. The negative electrode layer is a dissolution-deposition electrode. When viewed in plan view, a functional region, identified as a region where the positive electrode layer, the negative electrode layer, the electrolytic solution, and the porous separator overlap, is divided into power generation regions and a linear non-power generation region demarcating each power generation region. The power generation regions have a value α of 30 or less, the value α being defined by the equation: α=ΦP/wt, wherein Φ represents an area equivalent diameter (mm) per region of the power generation regions, P represents a thickness (mm) of the negative electrode layer, w represents a line width (mm) of the non-power generation region, and t represents a thickness (mm) of the porous separator.

Provided is a secondary battery including a power generation unit including a positive electrode layer, a negative electrode layer, a porous separator, and an electrolytic solution. The negative electrode layer is a dissolution-deposition electrode. When viewed in plan view, a functional region, identified as a region where the positive electrode layer, the negative electrode layer, the electrolytic solution, and the porous separator overlap, is divided into power generation regions and a linear non-power generation region demarcating each power generation region. The power generation regions have a value α of 30 or less, the value α being defined by the equation: α=ΦP/wt, wherein Φ represents an area equivalent diameter (mm) per region of the power generation regions, P represents a thickness (mm) of the negative electrode layer, w represents a line width (mm) of the non-power generation region, and t represents a thickness (mm) of the porous separator.

An alkaline battery includes a negative electrode. The negative electrode includes a negative electrode active material particle. The negative electrode active material particle includes a center part, a covering layer, and island-form layers. The center part includes zinc as a constituent element. The covering layer covers a surface of the center part and includes gallium as a constituent element. The island-form layers are present on a surface of the covering layer and include indium as a constituent element.

An alkaline battery includes a negative electrode. The negative electrode includes a negative electrode active material particle. The negative electrode active material particle includes a center part, a covering layer, and island-form layers. The center part includes zinc as a constituent element. The covering layer covers a surface of the center part and includes gallium as a constituent element. The island-form layers are present on a surface of the covering layer and include indium as a constituent element.

An alkaline electrochemical cell includes a cathode, an anode which includes an anode active material, and a non-conductive separator disposed between the cathode and the anode, wherein from about 20% to about 50% by weight of the anode active material relative to a total amount of anode active material has a particle size of less than about 75 μm, and wherein the separator includes a unitary, cylindrical configuration having an open end, a side wall, and integrally formed closed end disposed distally to the open end.

An alkaline electrochemical cell includes a cathode, an anode which includes an anode active material, and a non-conductive separator disposed between the cathode and the anode, wherein from about 20% to about 50% by weight of the anode active material relative to a total amount of anode active material has a particle size of less than about 75 μm, and wherein the separator includes a unitary, cylindrical configuration having an open end, a side wall, and integrally formed closed end disposed distally to the open end.

A secondary zinc-manganese dioxide secondary cell is disclosed. The cell includes a zinc gel anode, high manganese content cathode in either prismatic or jelly roll form. An aqueous based continuous reel to reel process for formulation and fabrication of the anode and cathode is provided. The cell is contained in a box assembly.

A method of sealing together two elements of a bipolar battery, the method comprising: interposing an inductive heating element between the two elements; applying a current to the inductive heating element to generate localized heat to melt material in the vicinity of the heating element to seal the two elements together.