Abstract: A battery information processing system processes information for estimating a full charge capacity of a module. The battery information processing system includes a storage device configured to store a trained neural network model and an analysis device configured to estimate a full charge capacity of a secondary battery from a result of measurement of an AC impedance of the module by using the trained neural network model. The trained neural network model includes an input layer given a numeric value for each pixel of an estimation image in which a Nyquist plot representing the result of measurement of the AC impedance of the module is drawn in a region consisting of a predetermined number of pixels.

Abstract: (A) A used battery pack is prepared. (B) By disassembling the used battery pack, a cell etc. is collected from the used battery pack. The cell etc. are a nickel-metal hydride battery. (C) A state of charge of the collected cell etc. is adjusted to a state of charge within any of a first SOC range (0 to 3%), a second SOC range (3 to 20%), and a third SOC range (100 to 200%). (G) An amount of voltage lowering as a result of the cell etc. being left is calculated. (H) When the amount of voltage lowering is equal to or smaller than a reference value set in advance, the cell etc. is determined as a good product. (I) A battery pack including the cell etc. determined as the good product is manufactured.

Abstract: A battery information processing system includes a storage device configured to store an equivalent circuit model which expresses an AC impedance of a battery module with a plurality of circuit constants. The plurality of circuit constants include first to eighth circuit constants. The first circuit constant is a junction inductance. The second circuit constant is a junction resistance. The third circuit constant is a solution resistance and the fourth circuit constant is a charge transfer resistance. The fifth circuit constant is a CPE index of a diffusion resistance. The sixth circuit constant is a CPE constant of the diffusion resistance. The seventh circuit constant is a CPE index of an electric double layer capacitance. The eighth circuit constant is a CPE constant of the electric double layer capacitance.

Abstract: A method for reusing a vehicle rechargeable battery to rebuild an assembled battery from a plurality of battery units having a usage history is provided. The method includes measuring a remaining charge of each of a plurality of battery units obtained by dismantling an assembled battery having a usage history. The method further includes selecting from the battery units a battery unit in which the measured remaining charge is greater than or equal to a remaining charge lower limit value, which is set in a range that is greater than zero and less than a lower limit value of a remaining charge control range of a vehicle in which the assembled battery was installed, and assembling a new assembled battery using the selected battery unit.

Abstract: A method for manufacturing a nickel-metal hydride battery includes: a first step of preparing a first nickel-metal hydride battery having a positive electrode including nickel hydroxide (Ni(OH)2); and a second step of manufacturing the second nickel-metal hydride battery by performing 600% overcharging to the prepared first nickel-metal hydride battery. The 600% overcharging is a process for supplying the first nickel-metal hydride battery with an amount of electric power of 600% of the rated capacity of the first nickel-metal hydride battery.

Abstract: A recovering device includes a charging chamber configured to overcharge a nickel-metal hydride battery. The charging chamber is provided with: a first water bath; a fixing device configured to fix the nickel-metal hydride battery with a portion of a container of the nickel-metal hydride battery being immersed in the water coolant in the first water bath; a pump; a dial gauge configured to detect a deformation amount of the container of the nickel-metal hydride battery; and a collection container configured to collect the gas exhausted from the exhaust valve of the nickel-metal hydride battery and exhaust the gas to outside the recovering device. The recovering device further includes a controller configured to perform the overcharging process for the nickel-metal hydride battery. The controller is configured to halt the overcharging process when the deformation amount of the container exceeds a threshold value.

Abstract: A method for determining a state of a rechargeable battery includes obtaining a complex impedance measured by applying AC voltage or AC current to a rechargeable battery that is subject to determination and determining a state of the rechargeable battery based on the obtained complex impedance. The determining a state of the rechargeable battery includes determining whether or not a first capacity shift is occurring based on a comparison of a value of the complex impedance at a predetermined frequency with a first determination value used to determine a negative electrode capacity shift, and when determined that the first capacity shift is not occurring, determining whether or not a second capacity shift is occurring based on a comparison of a gradient of the complex impedance with respect to a real axis in a diffusion resistance region with a second determination value used to determine a positive electrode capacity shift.

Abstract: A battery state determination device, which determines a micro-short-circuiting tendency state, includes an impedance meter that applies an AC voltage or an AC current of a measurement frequency to a rechargeable battery, which is subject to determination, and measures complex impedance. The device further includes a detector that detects an absolute value of an imaginary axis component of the complex impedance. The device further includes a determiner that compares the absolute value of the imaginary axis component detected by the detector with a lower limit threshold value. The lower limit threshold value is set based on a measurement result of the absolute value of the imaginary axis component of the rechargeable battery in the micro-short-circuiting tendency state. When the absolute value of the imaginary axis component is smaller than the lower limit threshold value, the determiner determines that the rechargeable battery is in the micro-short-circuiting tendency state.

Abstract: (A) A used battery pack is prepared. (B) By disassembling the used battery pack, a cell etc. is collected from the used battery pack. The cell etc. are a nickel-metal hydride battery. (C) A state of charge of the collected cell etc. is adjusted to a state of charge within any of a first SOC range (0 to 3%), a second SOC range (3 to 20%), and a third SOC range (100 to 200%). (G) An amount of voltage lowering as a result of the cell etc. being left is calculated. (H) When the amount of voltage lowering is equal to or smaller than a reference value set in advance, the cell etc. is determined as a good product. (I) A battery pack including the cell etc. determined as the good product is manufactured.

Abstract: This battery state determination device (10) is provided with: a voltage detection unit (13) that detects the voltage (V) of a rechargeable battery (M) to be evaluated; a current detection unit (12) that detects the current of the rechargeable battery (M); a charge state detection unit (11) that detects the state of charge (SOC) of the rechargeable battery (M); and a determination unit (11) configured so as to calculate the absolute value of the voltage gradient (G), which indicates the change in voltage with respect to the discharge amount (Ah), when the state of charge (SOC) of the rechargeable battery (M) is less than 40%, compare the absolute value of the voltage gradient (G) to a pre-set upper limit value (Gmax), and, when the absolute value of the voltage gradient (G) is greater than the upper limit value (Gmax), determine that a small short circuit has occurred in the rechargeable battery (M).

Abstract: This method for restoring battery capacity is provided with an oxygen-generating/exhausting step for charging a nickel-metal-hydride storage battery, causing the generation of oxygen gas in a positive electrode, opening a safety valve device, and discharging at least a portion of the oxygen gas through the safety valve device to the outside of the battery. The battery temperature when starting the step is in the range of ?30 to 10° C. and the SOC is in the range of (30-Ta) to 100%, or the battery temperature (Ta) is in the range of 10 to 50° C. and the SOC is in the range of 20-100%.

Abstract: A method for reusing a vehicle rechargeable battery to rebuild an assembled battery from a plurality of battery units having a usage history is provided. The method includes measuring a remaining charge of each of a plurality of battery units obtained by dismantling an assembled battery having a usage history. The method further includes selecting from the battery units a battery unit in which the measured remaining charge is greater than or equal to a remaining charge lower limit value, which is set in a range that is greater than zero and less than a lower limit value of a remaining charge control range of a vehicle in which the assembled battery was installed, and assembling a new assembled battery using the selected battery unit.

Abstract: In a method for adjusting a nickel-metal hydride storage battery, based on a correlation between a charge amount after valve opening and an increased amount of a discharge reserve capacity which are previously ascertained, the charge amount after valve opening corresponding to a target value of the set increased amount of the discharge reserve capacity is calculated and this calculated value is set as a target charge amount after valve opening. In a discharge reserve adjusting step, when a charge amount of the battery from the time when a safety valve device is opened after start of overcharge of the battery reaches the set target charge amount after valve opening, overcharge of the battery is terminated.

Abstract: A remaining life determining system for a stationary storage battery has a detecting unit configured to detect an evaluation value indicative of a deterioration level of the stationary storage battery, a first storage unit configured to store a usage history of the stationary storage battery, a second storage unit configured to store remaining life information associated with usage information of the stationary storage battery, a third storage unit configured to store remaining life basic information of the stationary storage battery, and a controller configured to estimate the remaining life of the stationary storage battery, from the usage history, the evaluation value, and the remaining life information.

Abstract: A battery state determination device, which determines a micro-short-circuiting tendency state, includes an impedance meter that applies an AC voltage or an AC current of a measurement frequency to a rechargeable battery, which is subject to determination, and measures complex impedance. The device further includes a detector that detects an absolute value of an imaginary axis component of the complex impedance. The device further includes a determiner that compares the absolute value of the imaginary axis component detected by the detector with a lower limit threshold value. The lower limit threshold value is set based on a measurement result of the absolute value of the imaginary axis component of the rechargeable battery in the micro-short-circuiting tendency state. When the absolute value of the imaginary axis component is smaller than the lower limit threshold value, the determiner determines that the rechargeable battery is in the micro-short-circuiting tendency state.

Abstract: This battery state determination device (10) is provided with: a voltage detection unit (13) that detects the voltage (V) of a rechargeable battery (M) to be evaluated; a current detection unit (12) that detects the current of the rechargeable battery (M); a charge state detection unit (11) that detects the state of charge (SOC) of the rechargeable battery (M); and a determination unit (11) configured so as to calculate the absolute value of the voltage gradient (G), which indicates the change in voltage with respect to the discharge amount (Ah), when the state of charge (SOC) of the rechargeable battery (M) is less than 40%, compare the absolute value of the voltage gradient (G) to a pre-set upper limit value (Gmax), and, when the absolute value of the voltage gradient (G) is greater than the upper limit value (Gmax), determine that a small short circuit has occurred in the rechargeable battery (M).

Abstract: This method for restoring battery capacity is provided with an oxygen-generating/exhausting step for charging a nickel-metal-hydride storage battery, causing the generation of oxygen gas in a positive electrode, opening a safety valve device, and discharging at least a portion of the oxygen gas through the safety valve device to the outside of the battery. The battery temperature when starting the step is in the range of ?30 to 10° C. and the SOC is in the range of (30-Ta) to 100%, or the battery temperature (Ta) is in the range of 10 to 50° C. and the SOC is in the range of 20-100%.

Abstract: A control system for a battery assembly that consists of a plurality of batteries determines whether the battery assembly can be reused, by using detected values of the open voltage, internal resistance and full charge capacity of each of the batteries, as evaluation parameters.

Abstract: A determination method for a used secondary battery is provided. The determination method includes: comparing an alternating-current internal resistance threshold with an alternating-current internal resistance value; and determining whether a first secondary battery is allowed to be applied to a reconstructed battery pack. The alternating-current internal resistance value is acquired by applying an alternating-current signal having a predetermined frequency to the first secondary battery. The first secondary battery is the used secondary battery intended for determination. The alternating-current internal resistance threshold is a value corresponding to a liquid retention amount threshold of the separator of the first secondary battery. The liquid retention amount threshold is a liquid retention amount of a separator of a second secondary battery. The second secondary battery is the same type as the used secondary battery intended for determination.

Abstract: In a method for adjusting a nickel-metal hydride storage battery, based on a correlation between a charge amount after valve opening and an increased amount of a discharge reserve capacity which are previously ascertained, the charge amount after valve opening corresponding to a target value of the set increased amount of the discharge reserve capacity is calculated and this calculated value is set as a target charge amount after valve opening. In a discharge reserve adjusting step, when a charge amount of the battery from the time when a safety valve device is opened after start of overcharge of the battery reaches the set target charge amount after valve opening, overcharge of the battery is terminated.