Capacity maintenance rate estimation apparatus or capacity maintenance rate estimation method
A capacity maintenance rate and regulation technology, applied in the direction of measuring devices, measuring electrical variables, measuring electricity, etc., can solve the problems of sensor detection error, low calculation accuracy of capacity maintenance rate, etc., and achieve the effect of improving estimation accuracy
Active Publication Date: 2018-08-03
NISSAN MOTOR CO LTD
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Problems solved by technology
[0004] However, there is a problem that the calculation accuracy of the capacity maintenance rate is low due to the detection error of the sensor
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no. 1 approach 》
[0040] figure 1 It is a block diagram of a battery pack including the capacity maintenance ratio estimation device of this embodiment. The capacity maintenance rate estimating means is for estimating the capacity maintenance rate (corresponding to the degree of deterioration) of the battery. In the present embodiment, the capacity maintenance rate estimation device is mounted in the battery pack. The capacity retention rate estimating device does not necessarily have to be installed in the battery pack, and may be installed outside the battery pack.
[0041] The battery pack 1 includes cells 10 and a battery controller 20 . The battery pack 1 is a device in which a secondary battery and a controller are modularized. The battery pack 1 can be used as a power source for vehicles, a power source for stationary use, or the like.
[0042] The single cell 10 has a battery 11 , a current sensor 12 , a voltage sensor 13 , and a temperature sensor 14 . The battery 11 is a battery ...
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A capacity maintenance rate estimation apparatus for estimating a capacity maintenance rate of a battery according to the present invention is provided with: a detection unit that detects a current ofthe battery and a voltage of the battery; a current integrated value calculation unit that specifies a period from a first time point when an absolute value of the current of the battery becomes close to 0 ampere to a second time point when the absolute value of the current of the battery becomes close to 0 ampere as an integration period, and calculates an integrated value of the current of thebattery during the integration period on the basis of the detected current of the battery detected by the detection unit; a release voltage calculation unit that calculates a first release voltage ofthe battery at the first time point on the basis of the detected voltage detected by the detection unit, and calculates a second release voltage at the second time point on the basis of the detected voltage detected by the detection unit; and a capacity maintenance rate estimation unit that estimates the capacity maintenance rate of the battery on the basis of the voltage difference between the first release voltage and the second release voltage and an integrated value satisfying prescribed conditions, wherein the prescribed conditions are that the integrated value is equal to or higher thana prescribed lower-limit value and an average value of the current of the battery during the integration period is equal to or higher than a prescribed value.
Description
technical field [0001] The present invention relates to a device for estimating a capacity maintenance rate of a battery or a method for estimating a capacity maintenance rate of a battery. Background technique [0002] A battery capacity calculation method capable of calculating the battery capacity is known. This battery capacity calculation method calculates the amount of change in the current cumulative charge rate based on the sensor current cumulative value during a predetermined current integration period within the charging period of the battery, and estimates the discharge voltage at the start and end of the predetermined current integration period based on the state quantity of the battery, The charging rate at the start and end of the predetermined current integration period is obtained from the estimated release voltage, and the amount of change in the discharge voltage charging rate is calculated from the difference between the two. Then, the ratio of the curre...
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IPC IPC(8): G01R31/36
CPCG01R31/36G01R31/3842G01R31/392Y02P70/50G01R31/388G01R31/3648
Inventor 桥本浩明
Owner NISSAN MOTOR CO LTD