Method and device for estimating the minimum battery cell and system effective capacity and state of health

Abstract

The present invention provides the minimum battery cell and system effective capacity, and a method and device for estimating the state of health. For the method of estimating the state of health, first, the battery system is powered on, and the initial state of charge of the minimum cell of the battery system is determined in the charging state; When the battery system is fully charged, determine the state of charge of the smallest cell at the end of charging, and count the charging capacity of the smallest cell; then calculate the effective capacity of the smallest cell, the effective capacity of the battery system, and the state of health of the battery system. The invention effectively solves the problem of inaccurate estimation of the minimum effective capacity of a vehicle battery, the effective capacity of a battery system and the health state of the battery system.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicle power battery management, and in particular relates to a method and device for estimating the minimum battery cell and system effective capacity and health state. Background technique [0002] Due to the energy crisis and the pressure of environmental pollution, accelerating and cultivating the development of new energy vehicles is an urgent task to promote the sustainable development of the automobile industry. With the release of the "Energy Conservation and New Energy Vehicle Industry Development Plan (2012-2020)" by the General Office of the State Council, various OEMs regard the development of new energy vehicles as an important part of their business and attach great importance to them. Relying on its own advantages, the new energy industry, coupled with the new subsidies and preferential policies of the national ministries and commissions for new energy vehicles, has achieved tre...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a method for estimating the effective capacity of the minimum battery cell to solve the problem of inaccurate estimation of the minimum cell of the existing battery; the present invention also provides a method for estimating the effective capacity of the battery system to solve the problem of The problem of inaccurate estimation of the effective capacity of the existing battery system; the present invention also provides a method for estimating the state of health of the battery system to solve the problem of inaccurate estimation of the state of health of the existing battery system; the present invention also provides a health state of the battery system The state estimation device is used to realize the estimation method of the state of health of the battery system, and solve the problem of inaccurate estimation of the state of health of the existing battery system

Images