Battery management system slave address calibration system and method

Abstract

The present invention relates to the technical field of power batteries and provides a battery management system slave address calibration system and method. The method comprises the steps of (S1) receiving a square wave signal sent by a previous slave BMU or host BCU and acquiring the frequency of the square wave signal, and (S2) generating a slave address or a slave code of a current slave BMU based on the frequency of the square wave signal and sending a square wave signal with a different frequency to the next slave BMU or host BCU. The automatic calibration of the slave address is carriedout based on the frequency of the square wave signal, the anti-interference ability is high, and the invention is not restrained by the number of slave BMUs. Closed-loop detection characteristics areemployed, the number of slaves that have been calibrated can be calculated based on the frequency of the square wave signal fed back by a last slave BMU, therefore, whether the slave is successfullycompleted is confirmed, and the automatic calibration can be carried out even repair or program is changed.

Description

technical field [0001] The invention relates to the technical field of power batteries, and provides a battery management system slave address calibration system and method. Background technique [0002] At present, the battery management system mainly adopts a distributed master-slave connection mode, generally one BCU master and multiple BMU slaves. Because of mass production, each BMU is in the same state (same hardware, same software). When installed in a battery pack, due to the difference in the distribution of battery modules in the battery pack, the data collected by each BMU The number of batteries is not the same, and should have different ID numbers on the communication line, therefore, each BMU needs to be numbered and calibrated. This material mainly describes the automatic calibration method after the battery management system is assembled. [0003] The existing technology mainly adopts manual calibration, and the production line mass-produces BMUs (including...

AI Technical Summary

Problems solved by technology

The problems of manual calibration are: 1. The repetitive workload is heavy. After the software is burned in the production process, each BMU needs to be calibrated separately. Every time the calibration is performed, the serial number address must be reset on the host computer; 2. .After mass production, it is easy to have a backlog of inventory for a certain number of BMUs. When it is used in other projects, it may have to be taken out and re-numbered; 3. The BMU is installed in the battery pack. For some reason, the assembly error or After the address is calibrated incorrectly, it cannot be re-calibrated at the package level, and the calibration can only be performed after unpacking

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