METHOD FOR ESTIMATING FULL CHARGE CAPACITY AND CONTROLLER

• Main Authors: TAKEOKA SHUN, MATSUDA CHIHIRO, ARAKAWA TOSHIYA, HASEGAWA HAJIME, OKADA TAKASHI, TATEISHI MITSURU, TAKESHITA SHINYA, KAWAI TOMOYUKI
• Format: Patent
• Language: English; Japanese
• Published: 13.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

To efficiently determine the full charge capacity of a unit cell in an LFP battery of a bipolar type.SOLUTION: A ΔQ calculation unit 81 calculates a capacity increase amount ΔQ when the voltage of a unit cell 10N (N is an integer of 1 to M) increases from a first voltage Vb1 to a second voltage Vb2 while the unit cell 10N is being charged in an LFP battery of a bipolar type in which unit cells 101 to 10M using iron lithium phosphate are laminated as a positive electrode active material layer 1. A full charge capacity estimation unit 83 determines a full charge capacity Cf of the unit cell 10N as a parameter of the capacity increase amount ΔQ by using a full charge capacity Cf map.SELECTED DRAWING: Figure 1 【課題】バイポーラ型のＬＦＰ電池において、単位セルの満充電容量を効率的に求める。【解決手段】ΔＱ算出部８１は、正極活物質層１としてリン酸鉄リチウムを用いた単位セル１０１～１０Ｍを積層したバイポーラ型ＬＦＰ電池において、単位セル１０Ｎ（Ｎは、１～Ｍの整数）の充電中に、単位セル１０Ｎの電圧が第１電圧Ｖｂ１から第２電圧Ｖｂ２まで上昇したときの容量増加量ΔＱを算出する。満充電容量推定部８３は、満充電容量Ｃｆマップを用いて、容量増加量ΔＱをパラメータとして、単位セル１０Ｎの満充電容量Ｃｆを求める。【選択図】図１