Patent application number | Description | Published |
20130030739 | DEVICE AND METHOD FOR DETERMINING DETERIORATION OF SECONDARY BATTERY - A secondary battery is implemented as an assembly of a plurality of battery modules. An ECU calculates a deterioration indicator quantitatively indicating a degree of deterioration of a battery module for each of the plurality of battery modules, and detects as a module to be replaced, a battery module of which deterioration indicator has reached a prescribed replacement level. The ECU further extracts a module to additionally be replaced, which should be replaced simultaneously with the module to be replaced above, from battery modules of which deterioration indicator has not reached the replacement level, among the plurality of battery modules. | 01-31-2013 |
20130057291 | DEVICE AND METHOD FOR CALCULATING VALUE OF RECHARGEABLE BATTERY - A rechargeable battery is used with a plurality of battery cells restrained by a restraint member. After the rechargeable battery has the restraint member removed therefrom and is thus disassembled when the rechargeable battery is subsequently re-restrained by the restraint member and thus reused an internal resistance measurement unit measures the rechargeable battery's internal resistance based on battery data detected after the rechargeable battery is re-restrained. At least for the internal voltage, from a value thereof as measured after the battery is re-restrained an evaluation unit evaluates a value of the rechargeable battery that is reused. | 03-07-2013 |
20130076363 | SYSTEM AND METHOD FOR DETERMINING DEGRADATION OF RECHARGEABLE LITHIUM ION BATTERY - An MPU performs a degradation diagnosis based on an open circuit voltage characteristic of a rechargeable lithium ion battery indicating how the battery varies in open circuit voltage as the battery varies in capacity to obtain a capacity ratio of a positive electrode, a capacity ratio of a negative electrode, and a deviated capacity of the battery. The MPU applies the capacity ratio of the positive electrode and the capacity ratio of the negative electrode to a predetermined map for degradation attributed to wear to estimate a deviated capacity resulting from degradation attributed to wear and separates the deviated capacity into the deviated capacity resulting from degradation attributed to wear and a deviated capacity resulting from deposition of lithium. The MPU uses at least the deviated capacity resulting from deposition of lithium to determine whether a rechargeable lithium ion battery subject to determination of degradation is reusable and/or recyclable. | 03-28-2013 |
20130099794 | DEGRADATION DETERMINATION DEVICE AND DEGRADATION DETERMINATION METHOD FOR LITHIUM ION SECONDARY BATTERY - A degradation determination device includes: a measuring unit measuring an open-circuit voltage characteristic indicating an open-circuit voltage variation with respect to a lithium ion secondary battery capacity variation; and a determining unit determining a degradation state due to wear and precipitation of lithium using a parameter for identifying the open-circuit voltage characteristic that substantially coincides with the measured open-circuit voltage characteristic. The parameter includes single electrode capacity retention rates expressed by the expressions (I) positive electrode capacity retention rate=degraded positive electrode capacity/initial positive electrode capacity and (II) negative electrode capacity retention rate=degraded negative electrode capacity/initial negative electrode capacity, and a battery capacity variation expressed by the expression (III) battery capacity variation=degraded negative electrode capacity×shift of a negative electrode composition axis with respect to a positive electrode composition axis. | 04-25-2013 |
20140239915 | CONTROL APPARATUS AND CONTROL METHOD FOR LITHIUM-ION SECONDARY BATTERY - A control apparatus controlling charge and discharge of a lithium-ion secondary battery includes a temperature sensor obtaining the temperature of the lithium-ion secondary battery and a controller. The controller controls the charge and discharge of the lithium-ion secondary battery to maintain the temperature obtained by the temperature sensor at a level lower than an upper limit temperature allowed in the lithium-ion secondary battery. The controller estimates the amount of precipitation of lithium in the lithium-ion secondary battery and reduces the upper limit temperature in accordance with an increase in the amount of precipitation. | 08-28-2014 |
20140320087 | CONTROL APPARATUS AND CONTROL METHOD FOR ELECTRICITY STORAGE DEVICE - A control method controls the charging and discharging of an electricity storage device. In this control method, the temperature of a reference point inside the electricity storage device is calculated by using the temperature occurring outside the electricity storage device and an expression that expresses movement of heat. An upper-limit electric power that is used in the charging control or the discharging control of the electricity storage device is set to an electric power that corresponds to the calculated temperature of the reference point. The reference point is a grid point that exhibits a temperature that corresponds to, the internal resistance of the electricity storage device, of a plurality of grid points provided inside the electricity storage device. | 10-30-2014 |
20140335387 | ELECTRIC STORAGE SYSTEM - An electric storage system includes electric storage blocks and a controller determining the state of each of the electric storage blocks. The plurality of electric storage blocks are connected in series, and each of the electric storage blocks has a plurality of electric storage elements connected in parallel. Each of the electric storage elements has a current breaker breaking a current path within the electric storage element. The controller acquires at least one parameter of an internal resistance and a full charge capacity of each of the electric storage blocks, and uses a change rate between the acquired parameter and a reference value to specify the number of current breakers in a broken state (the number of breaks) in each of the electric storage blocks. The reference value refers to the value of the parameter in the electric storage block not including the current breaker in the broken state. | 11-13-2014 |
20140343876 | ELECTRIC STORAGE SYSTEM - Each of the electric storage elements has a current interrupt device interrupting a current path within the electric storage element. The controller uses the voltage detected by the voltage sensor to calculate the estimated value of a current passing through the electric storage block having a plurality of electric storage elements connected in parallel. The controller uses the correspondence between a first ratio and a second ratio to determine whether or not the current interrupt device is in an interrupt state. The first ratio is the ratio between the estimated current value and the reference value of a current passing through the electric storage block. The second ratio is the ratio between the total number of the electric storage elements constituting the electric storage block and the total number of the current interrupt devices not in the interrupt state. | 11-20-2014 |
20150022157 | CONTROL APPARATUS AND CONTROL METHOD FOR SECONDARY BATTERY - A control apparatus has a controller configured to control charge and discharge of a secondary battery. The controller acquires a positive electrode potential and a negative electrode potential of the secondary battery. The controller controls the charge and discharge of the secondary battery such that each of the positive electrode potential and the negative electrode potential changes within a range between an upper limit value and a lower limit value set for each of the positive electrode potential and the negative electrode potential. | 01-22-2015 |