Abstract: A proposed cell system 100 has a simple second cell unit 20 (for instance, a unit cell (second cell 21)) electrically connected in series to a first cell unit 10 (battery pack) that constitutes a main power source. The state of charge (SOC) of the first cell unit 10 is detected on the basis of a mixed voltage (V3) of first cells 11 included in the first cell unit 10 and the second cell 21.

Abstract: A proposed cell system 100 has a simple second cell unit 20 (for instance, a unit cell (second cell 21)) electrically connected in series to a first cell unit 10 (battery pack) that constitutes a main power source. The state of charge (SOC) of the first cell unit 10 is detected on the basis of a mixed voltage (V3) of first cells 11 included in the first cell unit 10 and the second cell 21.

Abstract: Provided is a sealed battery with improved safety and reliability in which no spark discharge or voltage recovery occurs after a current interrupt mechanism has been actuated. A sealed battery 10 includes a current interrupt mechanism 40: having an inversion plate 50 and a collector 60. The collector 60 and the inversion plate 50 are electrically and mechanically joined in the easily breakable section 61 and the inversion section 51, the easily breakable section 61 is broken and displaced together with the inversion section 51 by the displacement of the inversion section 51, and the electric connection of the collector 60 and the inversion plate 50 is interrupted. The distance between the collector 60 and the easily breakable section 61 after the displacement is within a range of 0.3 mm to 1.5 mm.

Abstract: Disclosed is a nonaqueous secondary battery (100) comprising a positive electrode (155) having a positive current collector (151) made of a metal, and a positive electrode active material (153) composed of a lithium-metal complex oxide. The surface of the positive electrode active material (153) is coated with a lithium salt (158) having an average thickness of 20-50 nm.

Abstract: Provided is a secondary battery system which can accurately detect a state of a secondary battery system (such as a secondary battery state and a secondary battery system failure). The secondary battery system (6) includes dV/dQ calculation means which calculates a dV/dQ value as a ratio of a change amount dV of a battery voltage V of a secondary battery (100) against a change amount dQ of an accumulation amount Q when the accumulation amount Q of the secondary battery (100) is changed. The secondary battery system (6) detects the state of the secondary battery system (6) by using the dV/dQ value.

Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.

Abstract: A battery system 100 includes an upper-limit electrical quantity setting means (an ECU 120) for setting an upper limit of an electrical quantity (an upper-limit electrical quantity Da) obtainable from a battery pack 110 to a lower value than in a full charge state. This upper-limit electrical quantity setting means 120 sets the upper-limit electrical quantity Da to a value having a difference from the electrical quantity (a full-charge electrical quantity Dmax) obtainable from the full charge state so that the difference is smaller as the deterioration of the battery pack 110 progresses. Further, the battery system 100 includes a charging means (the ECU 120) for charging the battery pack 110 under the condition that the upper-limit electrical quantity Da is an upper limit.

Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.

Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.

Abstract: A control method for a lithium ion secondary battery includes performing a charging step of charging the lithium ion secondary battery with a predetermined quantity of electricity when the battery voltage of the lithium ion secondary battery has decreased to a lower limit battery voltage that is set at a value that falls within a range higher than (B?C) V and lower than or equal to (B?C+0.2) V where a maximum value of a positive electrode potential of a flat portion in a discharge positive electrode potential curve is B (V) and a negative electrode dissolution potential is C (V). It is possible to suppress a dissolution of a negative electrode current collector of the lithium ion secondary battery to prevent the service life of the lithium ion secondary battery from shortening because of an internal short circuit.

Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.

Abstract: The invention provides a method of diagnosing a malfunction in an abnormal voltage detecting apparatus, which includes breaking an electrical connection between a secondary battery (100) and an abnormal voltage detecting apparatus (40, 31) and connecting the abnormal voltage detecting apparatus to a direct current voltage generating portion (20) that is different from the secondary battery (100), applying direct current voltage that has a predetermined voltage value that is outside of a normal voltage range to the abnormal voltage detecting apparatus (40) using the direct current voltage generating portion, and determining that there is a malfunction in the abnormal voltage detecting apparatus if the abnormal voltage detecting apparatus does not determine that the voltage is abnormal.

Abstract: The present invention provides a lithium secondary battery having: an electrode body (80) that is made up of a positive electrode having a positive electrode active material layer that has a positive electrode active material on the surface of a positive electrode collector, a negative electrode having a negative electrode active material layer that has a negative electrode active material on the surface of a negative electrode collector, and a separator disposed between the positive electrode and the negative electrode; and a metallic battery case (50) that houses the electrode body and an electrolyte solution; wherein either the positive electrode or the negative electrode is electrically connected to the battery case (50), and a electric resistance value of the electrode active material layer of the electrode on a side not conductively connected to the case (50) is 90-fold or greater than the electric resistance value of the electrode active material layer of the electrode on a side conductively connected

Abstract: A control method for a lithium ion secondary battery includes performing a charging step of charging the lithium ion secondary battery with a predetermined quantity of electricity when the battery voltage of the lithium ion secondary battery has decreased to a lower limit battery voltage that is set at a value that falls within a range higher than (B?C) V and lower than or equal to (B?C+0.2) V where a maximum value of a positive electrode potential of a flat portion in a discharge positive electrode potential curve is B (V) and a negative electrode dissolution potential is C (V). It is possible to suppress a dissolution of a negative electrode current collector of the lithium ion secondary battery to prevent the service life of the lithium ion secondary battery from shortening because of an internal short circuit.

Abstract: A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.

Abstract: A battery system 100 includes an upper-limit electrical quantity setting means (an ECU 120) for setting an upper limit of an electrical quantity (an upper-limit electrical quantity Da) obtainable from a battery pack 110 to a lower value than in a full charge state. This upper-limit electrical quantity setting means 120 sets the upper-limit electrical quantity Da to a value having a difference from the electrical quantity (a full-charge electrical quantity Dmax) obtainable from the full charge state so that the difference is smaller as the deterioration of the battery pack 110 progresses. Further, the battery system 100 includes a charging means (the ECU 120) for charging the battery pack 110 under the condition that the upper-limit electrical quantity Da is an upper limit.

Abstract: The invention provides a method of diagnosing a malfunction in an abnormal voltage detecting apparatus, which includes breaking an electrical connection between a secondary battery (100) and an abnormal voltage detecting apparatus (40, 31) and connecting the abnormal voltage detecting apparatus to a direct current voltage generating portion (20) that is different from the secondary battery (100), applying direct current voltage that has a predetermined voltage value that is outside of a normal voltage range to the abnormal voltage detecting apparatus (40) using the direct current voltage generating portion, and determining that there is a malfunction in the abnormal voltage detecting apparatus if the abnormal voltage detecting apparatus does not determine that the voltage is abnormal.

Abstract: Provided is a secondary battery system which can accurately detect a state of a secondary battery system (such as a secondary battery state and a secondary battery system failure). The secondary battery system (6) includes dV/dQ calculation means which calculates a dV/dQ value as a ratio of a change amount dV of a battery voltage V of a secondary battery (100) against a change amount dQ of an accumulation amount Q when the accumulation amount Q of the secondary battery (100) is changed. The secondary battery system (6) detects the state of the secondary battery system (6) by using the dV/dQ value.

Abstract: Disclosed is a nonaqueous secondary battery (100) comprising a positive electrode (155) having a positive current collector (151) made of a metal, and a positive electrode active material (153) composed of a lithium-metal complex oxide. The surface of the positive electrode active material (153) is coated with a lithium salt (158) having an average thickness of 20-50 nm.

Abstract: A lithium-ion secondary battery of this invention has a positive-electrode active material, a negative-electrode active material, and a nonaqueous electrolysis solution. The positive-electrode active material is LiFe(1-X)MXPO4 (where M represents at least one of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, and where 0?X?0.5). Moreover, the nonaqueous electrolysis solution contains an ester solvent.