BATTERY SYSTEM

• Main Authors: KAGAMI MASAHIRO, INAGAKI YUYA
• Format: Patent
• Language: English; Japanese
• Published: 18.07.2019
• 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 suppress an increase of a battery internal pressure at an early stage by detecting an increase of the battery internal pressure at an early stage and controlling the charge amount in a secondary battery.SOLUTION: An ECU predicts a future open circuit voltage (OCV) of a secondary battery by using the change amount of the open circuit voltage of the secondary battery during a prescribed period. The ECU predicts a future gas generation speed inside a case of the secondary battery by using the predicted future open circuit voltage. Further, the ECU predicts a future gas generation amount inside the case of the secondary battery by using the predicted future gas generation speed. Then, the ECU controls the charge amount in the secondary battery by using the current pressure (battery internal pressure BIP) inside the case of the secondary battery and the predicted future gas generation amount (predicted gas generation amount G) (S31-S35).SELECTED DRAWING: Figure 9 【課題】電池内圧の上昇を早期に検知して二次電池の充電量制御により電池内圧の上昇を早期に抑制する。【解決手段】ＥＣＵは、所定期間における二次電池の開放電圧（ＯＣＶ）の変化量を用いて、二次電池の将来の開放電圧を予測する。ＥＣＵは、予測した将来の開放電圧を用いて、二次電池のケース内での将来のガス発生速度を予測する。さらに、ＥＣＵは、予測した将来のガス発生速度を用いて、二次電池のケース内での将来のガス発生量を予測する。そして、ＥＣＵは、二次電池のケース内の現在の圧力（電池内圧ＢＩＰ）と、予測した将来のガス発生量（予測ガス発生量Ｇ）とを用いて、二次電池の充電量を制御する（Ｓ３１〜Ｓ３５）。【選択図】図９