Lithium iron phosphate battery convenient for management of battery management system

Abstract

The invention discloses a novel lithium iron phosphate battery convenient for management of a battery management system (BMS). An electrical core of the lithium iron phosphate battery mainly comprises an anode material and a cathode material; a ternary material (LiNIxCoyMn1-x-yO2) is added into the anode material to change a discharge voltage characteristic curve of the lithium iron phosphate battery at 3.1 V and slope the curve, so as to facilitate the BMS to acquire voltage and estimate state of charge (SOC) of the battery, thereby effectively carrying out charge and discharge management on the battery and substantially prolonging usage life of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to battery management and lithium iron phosphate battery technology. Background technique [0002] The battery management system (BMS) is the link between the battery and the user, and the main object is the secondary battery. Secondary batteries have the following disadvantages, such as less stored energy, short life, problems in series and parallel use, safety in use, and difficulty in estimating battery power. The performance of batteries is very complex, and the characteristics of different types of batteries vary greatly. The main purpose of BMS is to improve the utilization rate of the battery, prevent the battery from overcharging and overdischarging, prolong the service life of the battery, and monitor the state of the battery. [0003] With its excellent charging and discharging performance and high energy density, lithium iron phosphate battery is widely used i...

AI Technical Summary

Problems solved by technology

Ordinary lithium iron phosphate batteries generally use lithium iron phosphate (LiFePO 4 ) as the active material of the positive electrode of the battery, but the voltage characteristic curve during the discharge process of the lithium iron phosphate battery is relatively smooth when it is around 3.1V, which is not conducive to the BMS collecting voltage data to evaluate the remaining battery capacity (SOC) of the battery pack. The actual evaluation The error is relatively large

Therefore, it is easy for a single battery to be overcharged or overdischarged to cause damage to the battery, which affects the normal operation of the battery pack and greatly shortens the working life.

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