SECONDARY BATTERY SYSTEM AND VEHICLE INCLUDING THE SAME, AND METHOD OF CONTROLLING BATTERY

• Main Authors: UCHIDA YOSHIHIRO, MACHIDA KIYOHITO, OTANI TAKUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 25.07.2019
• 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

To continue battery charging while protecting a battery from lithium precipitation, in charging a battery of a lithium ion secondary battery at low temperatures.SOLUTION: When the temperature TB of a battery 150 falls below a predetermined temperature Tc in performing lithium precipitation suppression control, an ECU 100 further performs temperature rise control to raise the temperature TB of the battery 150 by repeating charging and discharging of the battery 150. In the temperature rise control, when the amount of a target current Itag falls below a first threshold value TH1 that is larger than 0, charging of the battery 150 is prohibited by restricting allowable charge power Iwin to 0 and the battery 150 is discharged, and, when the amount of an allowable current Ilim exceeds a second threshold value TH2, charging of the battery 150 is resumed by removing the restriction of the allowable charge power Iwin.SELECTED DRAWING: Figure 5 【課題】リチウムイオン二次電池であるバッテリの低温での充電時において、リチウム析出からバッテリを保護しつつ、バッテリの充電を進める。【解決手段】ＥＣＵ１００は、リチウム析出抑制制御の実行時にバッテリ１５０の温度ＴＢが所定温度Ｔｃを下回る場合、バッテリ１５０の充放電を繰り返すことによりバッテリ１５０の温度ＴＢを上昇させる昇温制御をさらに実行する。昇温制御は、目標電流Ｉｔａｇの大きさが０よりも大きな第１の閾値ＴＨ１を下回ったときには、許容充電電力Ｉｗｉｎを０に制限することでバッテリ１５０の充電を禁止するとともにバッテリ１５０を放電させ、許容電流Ｉｌｉｍの大きさが第２の閾値ＴＨ２を上回ると、許容充電電力ＩＷｉｎの制限を解除することでバッテリ１５０の充電を再開させる制御である。【選択図】図５