Calibration method of charge and discharge characteristics of lithium battery and charge and discharge characteristics calibration apparatus

The invention discloses a calibration method of charge and discharge characteristics of a lithium battery. The calibration method includes 1, subjecting a lithium battery to be tested to constant-current charging and finishing the charging once the battery voltage reaches to the rated maximum voltage; calculating battery level after charging, in the formula, t1 is the charging time, i is charging current, and Eta is battery efficiency coefficient, to be specific, the Eta=EtaT*Etat*Etai, EtaT is temperature influence coefficient, Etat is aging coefficient, and Etai is charge and discharge multiplying factor coefficient; subjecting the lithium battery to be tested to discharging and finishing the discharging once the real-time voltage reaches to the rated minimum voltage; calculating the maximum charging capacity Q2, in the formula, i is discharging current, t2 is discharging time, and Eta is battery efficiency coefficient; according to Q1 and Q2, calibrating the initial charging state of the battery and drawing function curve of the charging voltage-SOC. The calibration method is available in a charge and discharge characteristics calibration apparatus, accurate to calculate and wide in application range. The charge and discharge characteristics calibration apparatus is simple in circuit, light and small and easy to operate.