CHARGEABLE BATTERY STATE DETECTING DEVICE AND CHARGEABLE BATTERY STATE DETECTING METHOD

• Main Author: IWANE NORIYASU
• Format: Patent
• Language: English; Japanese
• Published: 08.08.2019
• 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 detect a state of a chargeable battery at a sufficient frequency.SOLUTION: A chargeable battery state detecting device has: determination means (CPU 10a) which determines whether a chargeable battery is in a discharging state; measurement means (voltage sensor 11 and current sensor 12) which measures, when the determination means determines that the chargeable battery is being discharged, values of a current flowing in the chargeable battery and a terminal voltage thereof a plurality of times; calculation means (CPU 10a) which calculates, from the values of the current and terminal voltage measured by the measurement means, values of internal resistance of the chargeable battery at respective measurement timings; specification means (CPU 10a) which fits the values of internal resistance at the respective measurement timings calculated by the calculation means as a function including the current as an input variable, and specifies the internal resistance as a function including the current as an input variable; and detection means (CPU 10a) which detects the state of the chargeable battery based upon the function specified by the specification means.SELECTED DRAWING: Figure 1 【課題】十分な頻度で充電可能電池の状態を検出すること。【解決手段】充電可能電池が放電状態であるか否かを判定する判定手段（ＣＰＵ１０ａ）と、判定手段によって放電中であると判定された場合には、充電可能電池に流れる電流および端子電圧の値を複数回測定する測定手段（電圧センサ１１、電流センサ１２）と、測定手段によって測定された電流および端子電圧の値から、それぞれの測定タイミングにおける充電可能電池の内部抵抗の値を算出する算出手段（ＣＰＵ１０ａ）と、算出手段によって算出されたそれぞれの測定タイミングにおける内部抵抗の値を、電流を入力変数とする関数としてフィッティングし、内部抵抗を、電流を入力変数とする関数として特定する特定手段（ＣＰＵ１０ａ）と、特定手段によって特定された関数に基づいて充電可能電池の状態を検出する検出手段（ＣＰＵ１０ａ）と、を有する。【選択図】図１