Battery pack and method of controlling the same

摘要

A battery pack blocks a current flowing between battery cells coupled in parallel among a plurality of battery cells coupled in series and in parallel while measuring voltages so as to prevent a battery cell in a low-voltage state from being automatically charged through a battery cell coupled in parallel to the battery cell in a low-voltage state, and the battery pack accurately determines whether there is an abnormal battery cell by detecting voltages of battery cells coupled in series, thereby performing accurate measurement.

主权项

1. A battery pack comprising:
a protective circuit; a plurality of battery cells coupled with the protective circuit, the plurality of battery cells being coupled in series and in parallel; a plurality of current limiting devices each coupled between corresponding battery cells that are coupled in parallel among the plurality of battery cells; and at least one switch coupled in parallel to at least one of the current limiting devices, the at least one switch comprising a first terminal coupled to a first terminal of the at least one of the current limiting devices, and a second terminal coupled to a second terminal of the at least one of the current limiting devices, wherein the protective circuit is configured to measure voltages of at least two battery cells coupled in series among the plurality of battery cells, wherein the switch is turned off when measuring voltages of at least two battery cells coupled in series among the plurality of battery cells, and wherein the protective circuit is configured to compare measured voltages with a reference voltage, and turn off a charge-discharge switch that controls charging or discharging of the plurality of battery cells or blow a fuse on a high current path (HCP) of the plurality of battery cells when a difference between any of the measured voltages and the reference voltage is equal to or greater than a first threshold value.