Battery pack for power tool, and power tool

摘要

A battery pack for power tool includes a battery, a monitoring circuit, and a sleep mode switching unit. The battery includes at least one battery cell. The monitoring circuit is operated by receiving power supply from the battery. The sleep mode switching unit switches the battery pack to a sleep mode by stopping at least a part or all of operations of the monitoring circuit when the monitoring circuit detects a discharge end state where a discharge current from the battery is equal to or lower than a predetermined set current value, and the monitoring circuit further detects at least one of a voltage stable state where a voltage change amount in the battery cell is within a predetermined stable range of voltage change amount and a temperature stable state where a temperature change amount in the battery is within a predetermined stable range of temperature change amount.

主权项

1. A battery pack for power tool comprising:
a battery that includes at least one battery cell; a monitoring circuit that monitors a status of the battery, the monitoring circuit being operated by receiving power supply from the battery; a sleep mode switching unit that switches the battery pack to a sleep mode by stopping at least a part or all of operations of the monitoring circuit if the monitoring circuit detects a discharge end state where a discharge current from the battery is equal to or lower than a predetermined set current value, and the monitoring circuit further detects at least one of a voltage stable state where a voltage change amount in the battery cell is within a predetermined stable range of voltage change amount and a temperature stable state where a temperature change amount in the battery is within a predetermined stable range of temperature change amount, wherein in a normal operational state of the monitoring circuit, the monitoring circuit detects an abnormality of the batter cell if a temperature change amount in the batter cell is equal to or greater than a redetermined value or if the voltage change amount in the batter cell is equal to or greater than a predetermined value.