Control method of supplementary electricity type battery management circuit additionally provided with discharging module

Abstract

The invention discloses a control method of a supplementary electricity type battery management circuit additionally provided with a discharging module. According to the control method, a dischargingmodule is additionally arranged on the basis of a supplementary electricity type battery management circuit, so that a discharging equalization function, a charging current calibration function and anexternal line and internal switch state detection function are achieved, bidirectional charging and discharging equalization of the supplementary battery active equalization circuit is achieved, andthe equalization precision of the circuit and the reliability of the system are improved.

Description

technical field [0001] The invention is aimed at the control method of adding a discharge module to the supplementary battery management circuit, which can realize the discharge equalization function, the charging current calibration function and the external circuit and internal switch state detection function, so that the supplementary battery active equalization circuit realizes two-way charging. Discharge equalization, and improve the balance accuracy of the circuit and the reliability of the system. Background technique [0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are connected in series, with the increase in the number of uses, the capacity, remaining power and internal resistance of the single battery appear to be different and gradually expand, resulting in The performance of the lithium battery pack is declining. The industry usually uses a passive balance management circuit to a...

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Problems solved by technology

[0002] Due to material characteristics, manufacturing process, working conditions, and aging and decline, after lithium batteries are connected in series, with the increase in the number of uses, the capacity, remaining power and internal resistance of the single battery have differences and gradually expand, resulting in Lithium battery pack performance decline

The industry usually uses a passive balance management circuit to adjust the consistency of the battery, but the passive balance circuit can only adjust the discharge of the single battery with too high power, and cannot realize the supplementary regulation of the single battery with low power. It is an unbalanced state that is more common than that of a single cell, so the efficiency of passive equalization is low. Therefore, a supplementary active equalization management circuit based on switch array is proposed.

[0003] The supplementary electrical equalization management circuit does not have discharge equalization capability, cannot achieve two-way equalization, equalization efficiency cannot be optimal, and equalization current is difficult to keep consistent with the design value due to device consistency issues, and it is difficult to calibrate the current during mass production , In addition, the existing battery management circuit is difficult to accurately judge the connection state of the sampling line and the state of the internal circuit, especially when the sampling line is about to be disconnected in a high-impedance state, the fault cannot be accurately detected by measuring the voltage, and there are potential safety hazards in use

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