METHOD, DEVICE AND PROGRAM FOR ESTIMATING BATTERY CHARGE RATE, AND RECORDING MEDIUM

• Main Author: ONDA TORU
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2021
• 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 provide a method and the like capable of estimating a charge rate by an optimum charge rate estimation method while always grasping a charge rate estimation error.SOLUTION: The above problem can be resolved by a method (100, 200), etc., for estimating a charge rate of a battery (1). The method includes: a step (103, 203) for sequentially updating a base charge rate (SOCb) having been estimated using a charge rate estimation method selected from among first to third charge rate estimation methods (20, 30, 40) by a cumulative charged/discharged amount of electricity after selection and estimating a current charge rate (SOC); a step (104, 204) for estimating a reference error (E0) of the current charge rate (SOC) estimated on the basis of the base charge rate (SOCb) and errors (E1-3) of the current charge rate estimated by the first to third charge rate estimation methods; and steps (105-113, 205-213) for selecting a new charge rate estimation method and determining the base charge rate (SOCb) on the basis of comparison of the reference error (E0) with at least one of the errors (E1-3).SELECTED DRAWING: Figure 1 【課題】充電率の推定誤差を常に把握しつつ、最適な充電率推定方法で充電率の推定を行うことができる方法等を提供する。【解決手段】上記課題は、バッテリ（１）の充電率を推定する方法（１００、２００）であって、第１〜３の充電率推定方法（２０、３０、４０）のなかから選択した充電率推定方法を用いて推定したベース充電率（ＳＯＣｂ）を、選択後の累積充放電電気量により順次更新して現在の充電率（ＳＯＣ）を推定するステップ（１０３、２０３）と、ベース充電率（ＳＯＣｂ）に基づいて推定した現在の充電率（ＳＯＣ）の基準誤差（Ｅ０）、第１〜３の充電率推定方法により推定される現在の充電率の誤差（Ｅ１〜３）を推定するステップ（１０４、２０４）と、基準誤差（Ｅ０）と、誤差（Ｅ１〜３）のうちの少なくとも１つとの比較に基づいて、新たな充電率推定方法を選択し、べース充電率（ＳＯＣｂ）を決定するステップ（１０５〜１１３、２０５〜２１３）とを含む方法等により解決することができる。【選択図】図１