ELECTRIC VEHICLE AND CONTROL METHOD THEREFOR

• Main Authors: ISHIOROSHI AKIO, OBATA HIROYUKI, KAMATANI HIDEKI, MUTA KOICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 13.10.2016
• 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; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide an electric vehicle mounted with a secondary cell, capable of completely suppressing high-rate deterioration of the secondary cell.SOLUTION: A battery 16 is a secondary cell and inputs and outputs electric power into/from a vehicle drive apparatus 22. A current sensor 24 detects an electric current I input and output into/from the battery 16. An ECU 26 controls charge and discharge of the battery 16 and calculates an evaluation value ΣD showing the degree of a deterioration of the battery 16 resulting from a deviation of salt concentration of the battery 16 involved in charge and discharge, using a detection value of the current sensor 24. The ECU 26 performs control for increasing SOC of the battery 16 when the evaluation value ΣD exceeds a predetermined threshold value.SELECTED DRAWING: Figure 1 【課題】二次電池を搭載した電動車両において、二次電池のハイレート劣化を確実に抑制する。【解決手段】電池１６は、二次電池であり、車両駆動装置２２との間で電力を入出力する。電流センサ２４は、電池１６に対して入出力される電流Ｉを検出する。ＥＣＵ２６は、電池１６の充放電を制御する。また、ＥＣＵ２６は、電流センサ２４の検出値を用いて、充放電に伴なう電池１６の塩濃度の偏りに起因した電池１６の劣化の度合いを示す評価値ΣＤを算出する。そして、ＥＣＵ２６は、評価値ΣＤが予め定められたしきい値を超えると、電池１６のＳＯＣを上昇させるための制御を実行する。【選択図】図１