SECONDARY BATTERY INTERNAL TEMPERATURE ESTIMATING APPARATUS AND SECONDARY BATTERY INTERNAL TEMPERATURE ESTIMATING METHOD

PROBLEM TO BE SOLVED: To estimate accurate internal temperature even when a secondary battery is in use or when thermal characteristics change.SOLUTION: A secondary battery internal temperature estimating apparatus that estimates an internal temperature of a secondary battery includes detection means (current sensor 12) that detects the external temperature of the secondary battery, estimating means (control unit 10) that applies the external temperature detected by the detection means to a thermal equivalent circuit of the secondary battery to estimate the internal temperature, detection means (control unit 10) that detects the presence or absence of a change in thermal characteristics of the secondary battery, and adjusting means (control section 10) that adjusts a parameter of the thermal equivalent circuit of the estimating means when the change in the thermal characteristic of the secondary battery is detected by the detection means.SELECTED DRAWING: Figure 1 【課題】二次電池の使用中や熱的特性が変化した場合でも正確な内部温度を推定すること。【解決手段】二次電池の内部温度を推定する二次電池内部温度推定装置において、二次電池の外部温度を検出する検出手段（電流センサ１２）と、検出手段によって検出された外部温度を、二次電池の熱的等価回路に適用して内部温度を推定する推定手段（制御部１０）と、二次電池の熱的特性の変化の有無を検知する検知手段（制御部１０）と、検知手段によって二次電池の熱的特性の変化が検知された場合には、推定手段の熱的等価回路のパラメータを調整する調整手段（制御部１０）と、を有する。【選択図】図１