Apparatus and method for sensing battery leakage current, and battery driving apparatus and battery pack comprising the apparatus

Abstract

The present invention relates to an apparatus for sensing a battery leakage current, including: a floating capacitor for charging the voltage detected from an anode terminal or a cathode terminal of a battery; a terminal selection switching unit for selecting the voltage detection path of the anode terminal and the cathode terminal; a charging switching unit for charging the floating capacitor with the voltage detected from the anode terminal or the cathode terminal via the selected voltage detection path; a polarity reverse switching unit for reversing the polarity of the voltage detected from the cathode terminal charged in the floating capacitor; and a leakage current determination unit for sensing the voltage detected from the anode terminal charged in the floating capacitor and the voltage detected from the cathode terminal and the polarity of which is reversed, calculating a leakage resistance, and comparing the leakage resistance with a reference insulation resistance to determine whether a leakage current has occurred.

Description

technical field [0001] The present invention relates to battery management devices and methods, and more particularly to devices and methods for sensing a leakage current of a battery. Background technique [0002] Recently, with depletion of fossil fuels and environmental pollution, more attention has been drawn to electric vehicles and hybrid vehicles (hereinafter, generally referred to as electric vehicles) that can be driven by batteries without using fossil fuels. [0003] Most batteries used in electric vehicles are storage batteries. Storage batteries are classified into lithium series batteries and nickel metal hydride series batteries. Lithium series batteries are mainly applied to small products such as digital cameras, P-DVD, MP3P, cellular phones, PDAs, portable game devices, electric tools, and electric bicycles (E-bike), and NiMH series are mainly applied For products requiring high output such as vehicles. [0004] Any device that uses batteries needs to ke...

AI Technical Summary

Problems solved by technology

[0008] The present invention is designed to solve the problems of the conventional field, and therefore one aspect of the present invention is to provide an apparatus and method for sensing the leakage current of a battery, which can be used in an easy and accurate manner using a simple Circuit configuration to sense battery drain current

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