Battery charging system having multiple charging modes

摘要

The present application provides a charging system having a charger and a battery. The charging system provides a quick-charging mode and a normal-charging mode. The quick-charging mode may be activated to charge the battery if certain conditions are met and the charging system may also have an indicating device for indicating when the quick-charging mode is finished. More specifically, the charger of the present application provides selective charging modes and provides an ultra-quick charging solution which may be controlled by the changes in the temperature of the battery and which can increase the charging power to quickly provide enough energy to finish a work task.

主权项

1. A charging system for a power tool, comprising:
a lithium ion battery, wherein the lithium ion battery is provided with a lithium ion battery cell; a charger comprising a quick-charging mode for charging the lithium ion battery and a normal-charging mode for charging the lithium ion battery, wherein the lithium ion battery cell can be charged using one of the quick-charging mode with a charging current equal to or greater than 4.5 A and the normal-charging mode with a charging current less than that of the quick-charging mode; and, a control circuit to switch charging modes, in response to a trigger signal from a control switch, via a mode selection circuit that selectively enters into one of the quick-charging mode and the normal-charging mode in response to a control signal sent from the control circuit wherein in the quick-charging mode, the battery has a first allowable highest temperature, a first charging time and a first allowable highest voltage and in the normal-charging mode, the battery has a second allowable highest temperature, a second charging time and a second allowable highest voltage, and wherein the second allowable highest temperature is greater than the first allowable highest temperature, the second charging time is greater than the first charging time and the second allowable highest voltage is greater than the first allowable highest voltage; and, wherein the control circuit deactivates the quick-charging mode when one of the following conditions occur: (i) the battery temperature reaches the first allowable highest temperature; (ii) the battery charging time reaches the first charging time; or (iii) the battery voltage reaches the first allowable highest voltage.