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

A technology of discharge power and conversion coefficient, applied in the field of chemical power supply, to achieve the effects of stable measurement results, fast and convenient testing, and a wide range of applications

Active Publication Date: 2015-12-02
SUZHOU TRACEABILITY STANDARD CERTIFICATION & INSPECTION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Embodiment Construction

[0026] The present invention will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention.

[0027] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0028] Before explaining the method for measuring the conversion coefficient of battery electric quantity of the present invention, several concepts involved will be described first.

[0029] Charging power conversion factor: K IC =Q SD / Q IC

[0030] Discharge power conversion factor: K ID =Q SD / Q ID

[0031] The method for measuring the battery power conversion coefficient of the invention will be described in detail later.

[0032] In the following examples, the battery cell is LiFePO produced by a certain company. 4 Take a lithium-ion power battery as an example, its 3h rate rated capacity C is 10Ah, the rated v...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 郑燕萍张林锋汤学君孙伟明
Owner SUZHOU TRACEABILITY STANDARD CERTIFICATION & INSPECTION CO LTD
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