Multi-voltage battery pack, power tool system and charging system

A power tool system, comprising:

• a first power tool, having a first tool interface and capable of operating at a first operating voltage;
• a second power tool, having a second tool interface and capable of operating at a second operating voltage;
• a third power tool, having a third tool interface and capable of operating at a third operating voltage;
• and
• a multi-voltage battery pack comprising:
• a housing;
• battery strings, disposed inside the housing, comprising:
• a first battery string, including a plurality of battery cells arranged in series;
• a second battery string, including a plurality of battery cells arranged in series;
• a third battery string, including a plurality of battery cells arranged in series;
• and
• a fourth battery string, including a plurality of battery cells in series;
• a battery interface, disposed on the housing for use with (1) the first tool interface of the first power tool, (2) the second tool interface of the second power tool, and (3) the third tool interface of the third power tool;
• a terminal assembly, disposed inside the housing and electrically connected with the battery strings;
• and
• a converting assembly, comprising an internal socket disposed opposite the terminal assembly, the converting assembly disposed within the housing and electrically connected to the battery strings, the converting assembly having a first state, a second state, and a third state, wherein
• the converting assembly comprises a first connecting assembly, a second connecting assembly, and a third connecting assembly simultaneously arranged at intervals inside the internal socket and connectable to the terminal assembly respectively, the first connecting assembly, the second connecting assembly, and the third connecting assembly are arranged at intervals along a sliding direction of the internal socket to form a plurality of rows, the first connecting assembly is in a first row of the plurality of rows, the second connecting assembly is in a second row of the plurality of rows, and the third connecting assembly is in a third row of the plurality of rows;
• the first connecting assembly, the second connecting assembly, and the third connecting assembly have connecting sheets, the connecting sheets of the first connecting assembly, the second connecting assembly and the third connecting assembly are configured differently to switch connection states of the battery strings when connecting the terminal assembly to the first connecting assembly, the second connecting assembly or the third connecting assembly,
• connection states of the battery strings are switched through pushing the converting assembly to slide along the sliding direction of the internal socket to different positions so that the first connecting assembly, the second connecting assembly, or the third connecting assembly is connected to the terminal assembly:
• when the terminal assembly is electrically connected to the first connecting assembly, the first power tool is coupled with the multi-voltage battery pack, the converting assembly is in the first state, the converting assembly is located at a first position, and the multi-voltage battery pack outputs the first operating voltage to the first power tool;
• when the terminal assembly is electrically connected to the second connecting assembly, the second power tool is coupled with the multi-voltage battery pack, the converting assembly is in the second state, the converting assembly is located at a second position, and the multi-voltage battery pack outputs the second operating voltage to the second power tool;
• and
• when the terminal assembly is electrically connected to the third connecting assembly, the third power tool is coupled with the multi-voltage battery pack, the converting assembly is in the third state, the converting assembly is located at a third position, and the multi-voltage battery pack outputs the third operating voltage to the third power tool;
• wherein
• the third operating voltage is greater than the second operating voltage, and the second operating voltage is greater than the first operating voltage.

A charging system, comprising:

• a charger, having a charging interface;
• and
• a multi-voltage battery pack for use with power tools of different operating voltages, the multi-voltage battery pack comprising:
• a housing;
• battery strings, disposed inside the housing, comprising:
• a first battery string, including a plurality of battery cells arranged in series;
• a second battery string, including a plurality of battery cells arranged in series;
• a third battery string, including a plurality of battery cells arranged in series;
• and
• a fourth battery string, including a plurality of battery cells arranged in series;
• a battery interface, disposed on the housing for use with power tools;
• a terminal assembly, disposed inside the housing and electrically connected with the battery strings;
• and
• a converting assembly, comprising an internal socket disposed opposite the terminal assembly, the converting assembly disposed within the housing and electrically connected to the battery strings, the converting assembly having a first state, a second state, and a third state;
• wherein
• the converting assembly comprises a first connecting assembly, a second connecting assembly, and a third connecting assembly simultaneously arranged at intervals inside the internal socket and connectable to the terminal assembly respectively, the first connecting assembly, the second connecting assembly, and the third connecting assembly are arranged at intervals along a sliding direction of the internal socket to form a plurality of rows, the first connecting assembly is in a first row of the plurality of rows, the second connecting assembly is in a second row of the plurality of rows, and the third connecting assembly is in a third row of the plurality of rows;
• the first connecting assembly, the second connecting assembly, and the third connecting assembly have connecting sheets, the connecting sheets of the first connecting assembly, the second connecting assembly and the third connecting assembly are configured differently to switch connection states of the battery strings when connecting the terminal assembly to the first connecting assembly, the second connecting assembly or the third connecting assembly,
• connection states of the battery strings are switched through pushing the converting assembly to slide along the sliding direction of the internal socket to different positions so that the first connecting assembly, the second connecting assembly, or the third connecting assembly is connected to the terminal assembly;
• when the terminal assembly is electrically connected to the first connecting assembly, the converting assembly is in the first state, the converting assembly is located at a first position, the multi-voltage battery pack outputs a first operating voltage;
• when the terminal assembly is electrically connected to the second connecting assembly, the converting assembly is in the second state, the converting assembly is located at a second position, the multi-voltage battery pack outputs a second operating voltage;
• and
• when the terminal assembly is electrically connected to the third connecting assembly, the converting assembly is in the third state, the converting assembly is located at a third position, the multi-voltage battery pack outputs a third operating voltage;
• wherein
• the third operating voltage is greater than the second operating voltage, and the second operating voltage is greater than the first operating voltage;
• wherein when the multi-voltage battery pack is coupled with the charger, the charging interface is coupled with the battery interface, the converting assembly is in the first state, and the first battery string, the second battery string, the third battery string, and the fourth battery string are connected in parallel, then the charger charges the multi-voltage battery pack in the first operating voltage.