BATTERY SYSTEM MONITORING DEVICE

• Main Authors: EMORI AKIHIKO, KUDO AKIHIKO, KIKUCHI MUTSUMI, MACHIDA AKIHIRO, YAMAUCHI TATSUMI
• Format: Patent
• Language: English; Japanese
• Published: 29.03.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PERFORMING OPERATIONS; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To rapidly perform diagnosis on a circuit for measuring voltage across terminals of a secondary battery in a power storage device including a control IC for monitoring a battery system state.SOLUTION: A battery system monitoring device for monitoring a battery system including a plurality of single battery cells connected in series comprises: a plurality of voltage detection lines for measuring voltage across terminals of the single battery cells; and a balancing switch for performing balancing discharge of a single battery cell. To a voltage detection line is connected a first resistor and a first capacitor. A balancing discharge circuit constituted by the balancing switch and a second resistor connected in series to the balancing switch is connected between the voltage detection line connected to a positive electrode of a single battery cell and the voltage detection line connected to a negative electrode thereof. A connection point between the balancing discharge circuit and the voltage detection line connected to the positive electrode of the single battery cell and a connection point between the balancing discharge circuit and the voltage detection line connected to the negative electrode of the single battery cell are individually provided on the cell group side of the first resistor, respectively.SELECTED DRAWING: Figure 5 【課題】電池システム状態を監視する制御ＩＣを備えた蓄電装置において、二次電池の端子間電圧測定回路の診断を高速に行う。【解決手段】複数の単電池セルを直列接続した電池システムを監視する電池システム監視装置において、単電池セルの端子間電圧を測定するための複数の電圧検出線と、単電池セルのバランシング放電を行うバランシングスイッチを備え、電圧検出線には、第１の抵抗と第１のコンデンサが接続され、バランシングスイッチとバランシングスイッチに直列に接続された第２の抵抗とで構成されるバランシング放電回路が、単電池セルの正極に接続された電圧検出線と負極に接続された電圧検出線の間に接続される。バランシング放電回路と単電池セルの正極に接続された電圧検出線との接続点およびバランシング放電回路と単電池セルの負極に接続された電圧検出線との接続点は、それぞれ第１の抵抗よりセルグループ側に設けられる。【選択図】図５