Battery monitoring system

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

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Details

324430, 340636, G08B 2100

Patent

active

053451635

ABSTRACT:
A battery monitoring method and apparatus are used for monitoring the charge level of a rechargeable electric storage battery, for example a lead acid battery. The counter-voltage of the battery is monitored by continuously monitoring the actual terminal voltage of the battery. When the battery is fully charged, the monitor provides a "DO NOT CHARGE" signal, for example a green light. When the charge level has dropped to a point that there may be some value in recharging the battery, the "DO NOT CHARGE" signal is replaced with an "OK TO CHARGE" signal, for example a yellow light. When the battery has discharged to the point where the battery must be recharged in order to avoid damage, the "OK TO CHARGE" signal is replaced with a "MUST CHARGE" signal, for example a red light. Audible signals may accompany the "OK TO CHARGE" and "MUST CHARGE" signals. The monitor is self-testing when turned on. It automatically recognizes the charge level of a battery to which it is connected. When used in association with, for example, a lift truck , the monitor may include a lift lock-out function that is engaged in response to the battery being discharged to the "MUST CHARGE" level.

REFERENCES:
patent: 3932797 (1976-01-01), York
patent: 3940679 (1976-02-01), Brandwein et al.
patent: 3979657 (1976-09-01), Yorksie
patent: 3997888 (1976-12-01), Kremer
patent: 4024523 (1977-05-01), Arnold et al.
patent: 4803459 (1989-02-01), Ta

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