A battery management method based on battery safety protection

Abstract

The invention relates to a battery managing method based on battery safety protection. The battery managing method has the basic functions of an existing battery managing system and comprises the steps of self inspection, fault diagnosis, upgrade of system software, single battery condition monitoring, single battery balance, overcurrent / overcharge / over discharge protection, data recording and storage, insulation monitoring, fault diagnosis and the like. The battery managing method further has the safety protection function and can correct battery pack cut-off voltage and an SOC according to different battery pack assembling methods and external loads. The battery managing method can control battery pack charging current, charging cut-off voltage and charging time through initiative intervene on a battery pack charging process. The battery managing method can achieve efficient, quick and safe charge for battery packs of different structures. By forecasting available power and charging-discharging current of the battery packs in certain time, the discharging current of batteries can be limited to prevent some single battery from being in over discharge.

Description

technical field [0001] The invention relates to a battery management method based on battery safety protection. Background technique [0002] At present, major companies have launched their own electric vehicle models and successfully entered the market. However, as electric vehicles are widely accepted, various failures and accidents cast a shadow over their promotion and even development. Statistical analysis of the accident found that the causes of the accident mainly include: [0003] 1) After the batteries are grouped, the inconsistency of each single battery leads to failure of some single batteries; [0004] 2) The charger is a single charging mode, which does not have the time and power monitoring function and the charging time exceeds the limit control; [0005] 3) The charging and discharging current is too large; [0006] 4) The layout structure is not suitable, and the heat dissipation is not sufficient; [0007] 5) The battery pack is deformed after the coll...

AI Technical Summary

Problems solved by technology

[0003] 1) After the batteries are grouped, the inconsistency of each single battery leads to failure of some single batteries;

[0004] 2) The charger is a single charging mode, which does not have the time and power monitoring function and the charging time exceeds the limit control;

[0005] 3) The charging and discharging current is too large;

[0006] 4) The layout structure is not suitable, and the heat dissipation is not sufficient;

[0007] 5) The battery pack is deformed after the collision, causing a local short circuit

[0010] Application number 200680016327.1 discloses a battery power management system in the case of over-discharge, which focuses on the monitoring of single battery charging, and prevents the battery from over-charging and over-discharging through two switches. The circuit is complicated, and due to the battery structure and external load and other reasons, the monitoring principle of a single battery is not applicable to the overall battery pack

[0011] Application number 201010263482.1 discloses a method for estimating the battery SOC of an electric vehicle. This patent focuses on the research on the method of estimating the battery SOC. However, the structure of the battery and the external load will cause a large difference between the battery SOC. The SOC estimation of the single battery The accuracy does not represent the SOC estimation accuracy of the battery pack

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