ON-VEHICLE BATTERY SYSTEM

• Main Author: TANAKA HIROMASA
• Format: Patent
• Language: English; Japanese
• Published: 24.11.2017
• Subjects: 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; PERFORMING OPERATIONS; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide an on-vehicle battery system that can determine presence of welding of each of a plurality relays even when the relays are provided on a path of an AC loop.SOLUTION: In a first welding determination step, connection commands are given to relays SMRB1, SMRG1, SMRB2, and SMRG2 of first and second battery modules 10A and 10B, and the command to the relay SMRG1 is switched to an interruption command. A welding determination portion, when a detected value VL by a voltage sensor 16 exceeds a prescribed threshold, determines that welding is present in the relay SMRG1. In a second welding determination step, the interruption command to the relay SMRG1 is maintained, the relays SMRB1, SMRG1, SMRB2 for which the commands are switched to interruption commands are changed sequentially. When AC currents are outputted from an AC power source 34 and amplitude of AC currents detected by a current sensor 36 exceeds a prescribed threshold, the welding determination portion determines that welding is present in the relays for which the commands are switched to the interruption commands.SELECTED DRAWING: Figure 1 【課題】交流ループの経路上に複数のリレーが設けられたときであっても、個々のリレーの溶着の判定を可能とする車載バッテリシステムを提供する。【解決手段】第１溶着判定ステップでは、第１及び第２バッテリモジュール１０Ａ、１０ＢのリレーＳＭＲＢ１、ＳＭＲＧ１、ＳＭＲＢ２、ＳＭＲＧ２に対して接続指令を与え、リレーＳＭＲＧ１のみに対して遮断指令に切り替える。溶着判定部は、電圧センサ１６の検出値ＶＬが所定の閾値を超過するときに、リレーＳＭＲＧ１に溶着有りと判定する。第２溶着判定ステップでは、リレーＳＭＲＧ１の遮断指令を維持し、ＳＭＲＢ１、ＳＭＲＧ１、ＳＭＲＢ２に対して、遮断指令に切り替える対象となるリレーを順次変更する。交流電源３４から交流電流を出力させ、電流センサ３６が検出した交流電流の振幅が所定の閾値を超過するときに、遮断指令への切り替え対象となったリレーに対して溶着有りと判定する。【選択図】図１