BATTERY MONITORING DEVICE, BATTERY SYSTEM, AND ELECTRIC VEHICLE DRIVE DEVICE

• Main Authors: SUZUKI MUTSUMI, KIKUCHI MUTSUMI
• Format: Patent
• Language: English; Japanese
• Published: 16.11.2015
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

PROBLEM TO BE SOLVED: To provide a battery monitoring device capable of detecting, for each cell, the internal resistance of a plurality of battery cells.SOLUTION: A battery monitoring device 2 comprises a cell voltage measurement unit 21 for measuring an inter-electrode voltage in each of a plurality of battery cells, a second voltage measurement unit 22 for measuring a voltage at both ends of a battery cell group in which at least two or more battery cells are connected in series, a current measurement unit 23 for measuring the current flowing in a battery pack 10, and an arithmetic unit 240. The arithmetic unit 240 calculates the cell voltage ratio of each of battery cells on the basis of the measured inter-electrode voltage, calculates, on the basis of the cell voltage ratio and the measured end-to-end voltage, the cell voltage arithmetic value of each of battery cells at the time the end-to-end voltage is measured, and inputs trigger signals Svt, Sit for acquiring the end-to-end voltage and the current value as a set to each of the second voltage measurement unit 22 and the current measurement unit 23. 【課題】複数の電池セルの内部抵抗をセル毎に検知できる電池監視装置の提供。【解決手段】電池監視装置２は、複数の電池セルの各々の端子間電圧を計測するセル電圧計測部２１と、少なくとも２以上の電池セルが直列接続している電池セル群の両端電圧を計測する第２電圧計測部２２と、組電池１０を流れる電流を計測する電流計測部２３と、演算部２４０とを備える。演算部２４０は、計測された端子間電圧に基づいて電池セルのセル電圧比をそれぞれ算出し、セル電圧比と計測された両端電圧とに基づいて、両端電圧計測時における電池セルのセル電圧演算値をそれぞれ算出し、両端電圧と電流値とをセットとして取得するためのトリガ信号Ｓvt，Ｓitを、第２電圧計測部２２および電流計測部２３にそれぞれ入力する。【選択図】図１