Management system of power battery for mixed-power automobile

Abstract

This invention puts forward a kind of power battery's management system of mixed power vehicle. It is comprised by two subsystems: picking circuit board and master circuit board. The picking circuit board's single unit cell voltage picking module picking circuit board and total cell voltage / electric current picking module are connected with CPU's I / O after multicircuit switch and the A / D conversion chips. The picking circuit board and the master circuit board carry on communication through the CAN total line communication module. The address port and the data port of the master circuit board's not volatility data memory module have the conjunction with CPU's I / O. The reading port and writing port connect with CPU's reading port and writing port. And CPU's I / O separately connects with CA of strong electricity protection module, temperature control module and malfunction alarm module. This invention can improve the system's voltage picking accuracy and speed. It can improve the stability of data sending in complicated actual work condition. Furthermore, it improves the accuracy of single unit cell voltage collect and the anti- interference in the process of voltage collect.

Description

technical field [0001] The invention belongs to the field of automotive electronic application technology, and in particular relates to the battery management technology of the automobile. Background technique [0002] The multiple secondary battery packs used in hybrid electric vehicles are the key control components in the hybrid electric vehicle system. After they have experienced high-voltage series connection and multiple charge and discharge cycles, these battery packs may appear unbalanced between groups , which will greatly affect the power supply of electric vehicles, as well as the working efficiency and service life of these secondary battery packs, which will reduce the power of the entire system. Therefore, it is necessary to detect the operating status of each battery in the battery pack in real time and Performance is good or bad, including single battery voltage, total battery voltage, battery temperature, battery charge and dischar...

AI Technical Summary

Problems solved by technology

In the existing technology, see Chinese patents 91107576.3, 200310111783.2, 02136609.8, 95191121.X, 200310111599.8, 02127613.7, 200410013807.5, 02129322.8. To solve the problem of synchronization and relative battery voltage too high; the voltage acquisition of a single battery is mostly based on the CPLD programmable logic time-sharing to collect the electrode potential of each battery, and then take the potential difference between the positive and negative poles through the program as The terminal voltage of this group of batteries, but in the process of collecting the potentials of the positive and negative poles of each group of batteries, there must be an interval of several milliseconds, which may have a certain error in the calculation of the terminal voltage of the battery; The accuracy of the battery is not high, which leads to inaccurate estimation of the state of charge (SOC) of the battery; in the information communication between the system (acquisition board and main control board), single-bus technology, serial communication technology, etc. are mostly used. As a result, the anti-interference ability of the whole system in the actual working conditions of the whole vehicle is not strong

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