An alkaline dry cell includes a bottomed cylindrical cell case, a positive electrode packed in the cell case and is made of a stack of n pieces of hollow cylindrical pellets, a negative electrode disposed in a hollow portion of the pellets, a separator interposed between the positive electrode and the negative electrode, and an alkaline electrolytic solution. A thickness of a body portion of the cell case is 0.08 to 0.16 mm. n is an integer of 3 or more. An average density d.sub.m of manganese dioxide in the n pellets is 2.80 to 3.00 g/cm.sup.3. A density of manganese dioxide of at least one pellet positioned in a middle portion in a height direction of the stack is 2.75 g/cm.sup.3 or less.

An alkaline dry cell includes a bottomed cylindrical cell case, a positive electrode packed in the cell case and is made of a stack of n pieces of hollow cylindrical pellets, a negative electrode disposed in a hollow portion of the pellets, a separator interposed between the positive electrode and the negative electrode, and an alkaline electrolytic solution. A thickness of a body portion of the cell case is 0.08 to 0.16 mm. n is an integer of 3 or more. An average density d.sub.m of manganese dioxide in the n pellets is 2.80 to 3.00 g/cm.sup.3. A density of manganese dioxide of at least one pellet positioned in a middle portion in a height direction of the stack is 2.75 g/cm.sup.3 or less.

A separator for a bobbin-style electrochemical cell is inserted into an interior opening within a ring-shaped cathode in an electrochemical cell can. An expansion force is then applied to an interior surface of the separator to press the separator against the interior walls of the cathode. A tool may then remove various creases and/or wrinkles in the separator and/or may then heat seal at least a portion of the tubular walls of the separator to minimize the void space between the separator and active material (e.g., cathode and/or anode) within the electrochemical cell.

A battery can forming steel plate that configures an electrode can (a positive electrode can) of an alkaline battery and is to be formed into a battery can by presswork, the steel plate as a base material includes an iron and nickel diffusion layer or an iron and nickel-cobalt alloy diffusion layer that is formed by forming a nickel plated layer or a nickel-cobalt alloy plated layer with a thickness of 0.5 to 2.0 m on an inner surface of a battery can of a steel plate (base material steel plate) as a base material, and subsequently performing heat diffusion treatment on the nickel plated layer or the nickel-cobalt alloy plated layer. An average number of crystal grains per 0.25 mm.sup.2 unit area of the steel plate as the base material is equal to or more than 12.3.

A battery can forming steel plate that configures an electrode can (a positive electrode can) of an alkaline battery and is to be formed into a battery can by presswork, the steel plate as a base material includes an iron and nickel diffusion layer or an iron and nickel-cobalt alloy diffusion layer that is formed by forming a nickel plated layer or a nickel-cobalt alloy plated layer with a thickness of 0.5 to 2.0 m on an inner surface of a battery can of a steel plate (base material steel plate) as a base material, and subsequently performing heat diffusion treatment on the nickel plated layer or the nickel-cobalt alloy plated layer. An average number of crystal grains per 0.25 mm.sup.2 unit area of the steel plate as the base material is equal to or more than 12.3.

An electrochemical voltage source has an anode containing lithium, a cathode containing manganese oxide, and a housing. The cathode and the anode are arranged in an interior of the housing and are arranged opposite one another. An electrolyte reservoir in the form of a compressible storage body, which receives an electrolyte, is arranged between the anode and the cathode. The storage body has a first side resting against an end face of the cathode and a second side, which faces away from the first side, and rests against an end face of the anode. The cathode experiences an increase in volume when the voltage source is discharged. The anode experiences a decrease in volume during the discharge. During the discharge, the absolute value of the volume increase of the cathode is at least as great as the absolute value of the volume decrease of the anode.

A secondary battery, including an electrode assembly; a case accommodating the electrode assembly; a cap plate sealing the case; at least one electrode terminal including a terminal plate on the cap plate and a terminal pin passing through the cap plate and the terminal plate and electrically connected to the electrode assembly; and at least one groove on a top surface of the terminal plate; a top portion of the terminal pin is bent for insertion into the at least one groove.

An alkaline dry battery includes a bottomed cylindrical battery case; a positive electrode packed in the battery case and including n hollow cylindrical pellets; a negative electrode disposed in a hollow portion of the pellets; a separator interposed between the positive electrode and the negative electrode; and an alkaline electrolytic solution. The positive electrode includes manganese dioxide and a conductive agent, n is an integer of 1 or more, and an average density of manganese dioxide of the positive electrode is 2.80 to 3.00 g/cm.sup.3. The density d.sub.c of manganese dioxide in the center portion in the height direction of the positive electrode is 98% or less of an average value d.sub.e of density of manganese dioxide in each of both end portions.

An alkaline dry battery includes a bottomed cylindrical battery case; a positive electrode packed in the battery case and including n hollow cylindrical pellets; a negative electrode disposed in a hollow portion of the pellets; a separator interposed between the positive electrode and the negative electrode; and an alkaline electrolytic solution. The positive electrode includes manganese dioxide and a conductive agent, n is an integer of 1 or more, and an average density of manganese dioxide of the positive electrode is 2.80 to 3.00 g/cm.sup.3. The density d.sub.c of manganese dioxide in the center portion in the height direction of the positive electrode is 98% or less of an average value d.sub.e of density of manganese dioxide in each of both end portions.

An alkaline dry cell includes a bottomed cylindrical cell case, a positive electrode packed in the cell case and is made of a stack of n pieces of hollow cylindrical pellets, a negative electrode disposed in a hollow portion of the pellets, a separator interposed between the positive electrode and the negative electrode, and an alkaline electrolytic solution. A thickness of a body portion of the cell case is 0.08 to 0.16 mm. n is an integer of 3 or more. An average density d.sub.m of manganese dioxide in the n pellets is 2.80 to 3.00 g/cm.sup.3. A density of manganese dioxide of at least one pellet positioned in a middle portion in a height direction of the stack is 2.75 g/cm.sup.3 or less.