SOC variation and discharge power conversion factor measurement method when in discharge of power battery

Abstract

The invention discloses a power battery discharge power conversion factor measurement method which is accurate in result and simple. The method comprises the following steps: first discharging a fully-charged single battery to a discharge end voltage at a C / 3 rate and a constant current under a standard stipulation condition, and obtaining a standard discharge electric quantity QSD in a calculation manner; performing the constant-current discharge at different currents I in a same way, and obtaining the discharge electric quantity value QID of the battery at different currents I by virtue of calculation; fitting various different discharge currents I and the corresponding discharge electric quantity conversion factor KID=fID(I). The invention also provides an SOC variation measurement method when in discharge of a power battery which is accurate in test, simple and easy. The electric quantity of the power battery discharged at the current I is converted to the release electric quantity QZ=xif ID(I)Idt discharged at the C / 3 rate; when the power battery is discharged, SOC variation delta SOC=QZ / Qn, and Qn is a quoted capacity.

Description

technical field [0001] The invention relates to the technical field of application of chemical power sources, in particular to a measurement of power battery discharge, especially a method for measuring the conversion coefficient of battery discharge power and SOC variation. Background technique [0002] The change in SOC of the power battery is the basis for calculating the SOC of the battery, and the SOC of the power battery is an important parameter in the energy control strategy of the electric vehicle and the battery management system. Accurate SOC information is important for the efficient management of the battery and the improvement of the performance of the whole vehicle. significance. SOC is StateofCharge, which means state of charge, also called remaining power. At present, there is no uniform definition of battery SOC in the world, but most of them are defined by battery power. For example, the United States Advanced Battery Consortium (USABC) defines SOC in th...

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Problems solved by technology

At present, there is no unified definition of battery SOC in the world, but most of them are defined by battery power.

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