Abstract: The life of a secondary battery has not been able to be prolonged due to deterioration of the secondary battery. In one step, whether a difference between an average value of a negative electrode capacity deviations calculated in a different step and a negative electrode capacity deviation calculated in another step is larger than a predetermined value is determined. In a case where the average value of the measured negative electrode capacity deviations is larger than the ideal negative electrode capacity deviation, and deterioration of the negative electrode capacity deviation is proceeding, a secondary battery is controlled to operate at a high voltage in a further step. With the control, the deterioration of the negative electrode capacity deviation is suppressed and the life of the secondary battery is prolonged.

Abstract: The life of a secondary battery has not been able to be prolonged due to deterioration of the secondary battery. In one step, whether a difference between an average value of a negative electrode capacity deviations calculated in a different step and a negative electrode capacity deviation calculated in another step is larger than a predetermined value is determined. In a case where the average value of the measured negative electrode capacity deviations is larger than the ideal negative electrode capacity deviation, and deterioration of the negative electrode capacity deviation is proceeding, a secondary battery is controlled to operate at a high voltage in a further step. With the control, the deterioration of the negative electrode capacity deviation is suppressed and the life of the secondary battery is prolonged.

Abstract: An assembled battery is provided which can improve output density. Four unit cells are connected in series by a connection member 40 composed of a stacked metal plate obtained by stacking two metal plates 40a and 40b. The metal plate 40a is one of copper and aluminum while the metal plate 40b is nickel. Since the volume electrical resistance of both copper and aluminum is less than half that of nickel, the overall electrical resistance of the connection member 40 is lowered. Both end portions of the connection member 40 are joined to external electrode terminals by resistance welding so that the weld joint is formed from either a Cu—Ni or Al—Ni low resistance binary alloy.

Abstract: In a lithium secondary battery, the electrode assembly includes a positive electrode and a negative electrode which are assembled together with a separator interposing between said both electrodes. Each of the electrodes includes an active material mixture layer portion and an active material mixture layer free-portion which are arranged on a surface of said metal foil. A relationship of B1<B2 is satisfied, and a value of (A1+A2)/(B2?B1) is set equal to or less than 4. Where B1 (mm) is a width of the active material mixture layer portion of the positive electrode; B2 (mm) is a width of the active material mixture layer portion of the negative electrode; and each of A1 (mm) in the positive electrode and A2 (mm) in the negative electrode is a deviation between a straight line linking both corners of the active material mixture layer-free portion in the length direction of the metal foil and an edge of the active material mixture layer-free portion at a middle point in the length direction of the metal foil.

Abstract: In a lithium ion secondary cell including a wound group 20 in which a positive electrode 24 including a positive electrode mixture layer 5 and a negative electrode 22 including a negative electrode mixture layer 6 are wound with the interposition of separators 21, 23, a winding starting edge 22S is disposed more towards an inner peripheral side than the positive electrode 24; a winding ending edge 22E is disposed more towards an outer peripheral side than a winding ending edge 24E; the winding starting edges 24S, 22S, and the winding ending edges 24S, 22E are disposed within a flat portion of the wound group 20; and the negative electrode mixture layer 6 covering a surface of the positive electrode mixture layer 5 is disposed on an inner and an outer circumferential surface of the positive electrode mixture layer 5.

Abstract: The present invention provides a secondary battery module capable of securing safety at a time of abnormal battery operations by using a film-type secondary battery. A module 30 is provided with 8 pieces of single batteries 20 each using a laminate film as its battery container. The 8 pieces of single batteries are disposed in a layer-stacked state. A conducting plate 17 is placed in a manner to face one single battery 20a disposed at one end of the 8 pieces of the single batteries 20. A pushing member 14 is formed between the single battery 20a and conducting plate 17. A conducting plate 18 is disposed on a side of the conducting plate 17 opposite to the pushing member 14. The pushing member 14 has projected portions 14b. The conducting member 17 has through-holes 17a formed so that the projected portions are able to pass through. The conducting plates 17 and 18 are coupled by a coupling portion 21.

Abstract: A lithium-ion secondary cell includes a winding electrode assembly. The exposed area of the positive-electrode metal current collector body is formed at one end in a winding axis direction of the winding electrode assembly, and the exposed area of the negative-electrode metal current collector body is formed at another end in the winding axis direction of the winding electrode assembly; and the negative-electrode metal current collector body is a copper foil rolled to a thickness between 6 ?m and 15 ?m in which one or more of additive elements of Zr, Ag, Au, Pt, Cr, Cd, Sn, Sb, and Bi are added to Cu having a purity of equal to or greater than 99.9%, and the negative-electrode active material mix layer has a cavity volume ratio of between 30% and 60%.

Abstract: In a lithium secondary battery, the electrode assembly includes a positive electrode and a negative electrode which are assembled together with a separator interposing between said both electrodes. Each of the electrodes includes an active material mixture layer portion and an active material mixture layer free-portion which are arranged on a surface of said metal foil. A relationship of B1<B2 is satisfied, and a value of (A1+A2)/(B2?B1) is set equal to or less than 4. Where B1 (mm) is a width of the active material mixture layer portion of the positive electrode; B2 (mm) is a width of the active material mixture layer portion of the negative electrode; and each of A1 (mm) in the positive electrode and A2 (mm) in the negative electrode is a deviation between a straight line linking both corners of the active material mixture layer-free portion in the length direction of the metal foil and an edge of the active material mixture layer-free portion at a middle point in the length direction of the metal foil.

Abstract: The present invention provides a secondary battery module capable of securing safety at a time of abnormal battery operations by using a film-type secondary battery. A module 30 is provided with 8 pieces of single batteries 20 each using a laminate film as its battery container. The 8 pieces of single batteries are disposed in a layer-stacked state. A conducting plate 17 is placed in a manner to face one single battery 20a disposed at one end of the 8 pieces of the single batteries 20. A pushing member 14 is formed between the single battery 20a and conducting plate 17. A conducting plate 18 is disposed on a side of the conducting plate 17 opposite to the pushing member 14. The pushing member 14 has projected portions 14b. The conducting member 17 has through-holes 17a formed so that the projected portions are able to pass through. The conducting plates 17 and 18 are coupled by a coupling portion 21.

Abstract: The present invention provides an assembled battery which can improve output density. The assembled batter is configured by connecting four unit cells in series. The unit cells are disposed in parallel such that their polarities are alternate. Unit cells adjacent to each other are connected by a connection member 40. The connection member 40 is composed of a stacked metal plate obtained by stacking two metal plates 40a and 40b. Copper and nickel producing binary alloy by welding are used for the metal plates 40a and 40b, respectively. Since a volume resistance of copper is about ¼ of that of nickel, a ratio of volume resistances of metals used for the metal plates 40a and 40b, respectively, becomes ½ or less. Both end portions of the connection member 40 are joined to a positive electrode external terminal of one of the adjacent unit cells and a negative electrode external terminal of the other by resistance welding, respectively.

Abstract: A secondary battery having an excellent capacity maintenance factor or charging/discharging efficiency is provided. A lithium-ion battery comprises an electrode group that a positive electrode and a negative electrode which respective of active materials for the positive and negative electrodes is coated on both surfaces of a collecting member. An area S1 of a portion of then egative electrode 7 not facing the positive electrode 6 is set to be not more than 10% of an area S2 of a portion of the negative electrode 7 facing the positive electrode 6. An influence that the portion not facing the positive electrode affects a battery reaction is controlled, and the decrease in the capacity maintenance factor or the charging/discharging efficiency according to cycling use can be depressed.