Patent ID: 11876190
Assignee: MAKITA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A battery pack comprising:
a battery;
a memory storing a map A1 and a map B1, the map A1 and the map B1 each indicating a correspondence relation between a discharge current value and an addition value, the addition value in the map B1 being larger than the addition value in the map A1;
a signal terminal; and
a Main Control Unit (MCU) including an overcurrent counter value and a history counter value,
the MCU being configured to perform a discharge prohibition determination process, the discharge prohibition determination process including:
obtaining the discharge current value in response to an electric working machine being connected to the battery pack;
calculating the addition value corresponding to the discharge current value obtained, by using the map A1 in response to the history counter value being equal to or less than a setting value;
calculating the addition value corresponding to the discharge current value obtained, by using the map B1 in response to the history counter value being more than the setting value;
updating the overcurrent counter value by adding the addition value calculated to the overcurrent counter value;
turning ON an overload determination flag increasing the history counter value in response to the overcurrent counter value reaching an overload threshold; and
outputting a discharge prohibition signal via the signal terminal in response to the overcurrent counter value reaching a protection threshold larger than the overload threshold.