Battery pack for electric power tools

Details Battery pack for electric power tools Battery pack for electric power tools

1997-09-16

1999-05-11

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 87, 320107, 320112, H02H5/04

Patent

active

059034238

ABSTRACT:
The battery pack for electric power tools of this invention has a circuit breaker connected in series with the batteries to protect those batteries from abnormal temperature or abnormal current by cutting-off the current. The circuit breaker is provided with a manual reset mechanism wherein even if the temperature sensing element is cooled, automatic reset will not occur. The circuit breaker must be manually reset. After the circuit breaker detects battery abnormality and cuts-off current, the current cut-off state is maintained until the manual reset mechanism is operated.

REFERENCES:
patent: 4829226 (1989-05-01), Nakamura et al.

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