A passive battery balancing method based on master-slave mode

Abstract

The invention discloses a battery passive equalization method based on a master-slave mode, which includes a full-range equalization control, and the full-range equalization control includes the following steps: After the battery master control and the battery slave control in the battery management system are powered on and self-inspected, The battery management system enters the normal working state; the battery main control judges the open-circuit resting time of the battery; the battery main control judges other balance judgment conditions, and confirms whether the balance judgment conditions are met. In equalization, the open-circuit OCV curve is used to calculate the balanced marked capacity method, based on the actual capacity of each monomer rather than the general vehicle battery capacity, to eliminate errors and calculate accurate balanced capacity values, and to introduce balanced real-time time efficiency into the balanced control And balance current, reduce the statistical error of balance capacity. In the present invention, the master control uniformly manages and distributes the balance target value, and the slave control receives and transforms it into a balance mark capacity value to perform balance control, so that the overall system is balanced and uniform, the balance calculation is distributed, and less resources are occupied by the master control.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery passive balancing method based on a master-slave mode. Background technique [0002] At present, the state has invested a lot of financial and material resources to support the development of new energy electric vehicles, making the rapid development of new energy electric vehicles into the homes of ordinary people, which is also inseparable from the continuous optimization and research and development support of battery management systems. The battery management system is responsible for the detection of the total voltage and current of the battery system and the voltage and temperature of the single cell for ternary, lithium iron phosphate and other lithium material batteries. The more important function is the accurate estimation of SOC, SOH, SOE, etc. The body balance management scheme ensures the normal charging and discharging of lithium batteries, a...

AI Technical Summary

Problems solved by technology

Compared with active equalization, passive equalization has the advantages of strong security, high reliability, simple circuit, low cost, and convenient management, but there are problems such as low efficiency or effect deviation.

Images