Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1997-09-09
1999-03-23
Do, Diep N.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324426, 324427, 320150, 320153, G10R 3136, H01M 1044
Patent
active
058865276
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to method and device for monitoring deterioration in storage battery mounted as a power source for example on an electric motor-operated vehicle.
TECHNICAL BACKGROUND
For example, there are the Ni-MH secondary battery and the lead-acid secondary battery as batteries to be mounted as a power source for the electric motor-operated vehicle. The discharge capacity of such batteries gradually decreases through cyclic uses.
It is conceivable to carry out the maintenance including replacing, cleaning, and replenishing the electrolyte liquid of the battery after determining the deterioration of the battery by a voltage comparison method. However, the voltage comparison method requires cumbersome temperature compensation because the battery voltage itself changes with the ambient temperature.
Therefore, at the moment there is no simple, reliable means for constantly providing information on the necessity for the maintenance by accurately determining the state of deterioration of the battery as a power source of the electric motor-operated vehicle even during use, although such information is important.
The object of the invention made in view of the above situation is to provide method and device for monitoring deterioration in the storage battery that makes it possible to determine simply and reliably the state of deterioration in the storage battery capacity.
DISCLOSURE OF THE INVENTION
The storage battery deterioration monitoring method of the invention makes it possible always to accurately determine the state of deterioration of the battery irrespective of the ambient temperatures at which charging and discharging are carried out and to inform a user of the necessity for maintenance and the battery replacement timing through the following steps: A reference value of average battery temperature rise speed is stored in advance, an actual value of the average battery temperature rise speed is determined from the measurement of the battery temperature rise during charging, and the actual value of the average battery temperature rise speed is compared with the reference value of the average battery temperature rise speed to determine the degree of deterioration of the battery.
The value of the average battery temperature rise speed is determined by measuring and storing the battery temperature at the time of starting charging at a constant current, farther measuring the battery temperature after a specified period of time of charging, and calculating the average battery temperature rise speed for the specified period of time. The average battery temperature rise speed calculation makes accurate determination possible.
Also, display of deterioration level and/or warning of battery deterioration based on the determination of battery deterioration may inform the user of the necessity for the battery replacement timing and maintenance.
The battery deterioration monitoring device of the invention comprises; reference value storage means for storing the reference value of the average battery temperature rise speed, battery temperature detection means for measuring the battery temperature during charging, battery temperature rise speed calculating means for determining the average battery temperature rise speed by measuring the battery temperature during charging, and battery deterioration degree determination means for determining the degree of battery deterioration by comparing the actual value of the average battery temperature rise speed with the reference value of the average battery temperature rise speed. Comparison of the actual value of the average battery temperature rise speed with the reference value of the average battery temperature rise speed, and determination of the degree of deterioration easily and accurately irrespective of the ambient temperatures at which the battery is charged and discharged makes it possible to determine the degree of battery deterioration accurately and to inform the user of the battery replacement timing and the necessity for m
REFERENCES:
patent: 3852652 (1974-12-01), Jasinski
patent: 4755735 (1988-07-01), Inakagata
patent: 5583871 (1996-12-01), Simmonds et al.
patent: 5675258 (1997-10-01), Kadouchi et al.
patent: 5680030 (1997-10-01), Kadouchi et al.
patent: 5686815 (1997-11-01), Reipur et al.
Do Diep N.
Yamaha Hatsudoki Kabushiki Kaisha
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