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Battery SOC (state of charge) estimation method

A charging capacity and battery technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as lack of advantages, high cost, and difficult system settings, so as to reduce equipment energy consumption, reduce consumption, and improve estimation speed Effect

Inactive Publication Date: 2016-08-17
SHANGHAI ELECTRIC DISTRIBUTED ENERGY TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0023] 2. Due to the difficulty in setting up the system and the high cost when applied in the battery management system, there is no advantage

Method used

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  • Battery SOC (state of charge) estimation method
  • Battery SOC (state of charge) estimation method
  • Battery SOC (state of charge) estimation method

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Embodiment Construction

[0057] The method for estimating the charge capacity of a battery according to an embodiment of the present invention includes the following steps:

[0058] (1) When the battery is static, the charge capacity of the battery is obtained by the open circuit voltage method; when the battery is dynamic, the charge capacity of the battery is obtained according to the estimation formula obtained off-line.

[0059] The estimation formula is:

[0060] SOC=k*(V / I)-b,

[0061] Among them, SOC is the charge capacity of the battery, V is the voltage, I is the current, and k and b are functions of the current.

[0062] Step (1) The method for obtaining the charge capacity of the battery according to the estimation formula comprises the following steps:

[0063] (11) Collect the voltage, current and ambient temperature of the battery;

[0064](12) Bring the collected voltage, current and ambient temperature into the estimation formula to obtain the charge capacity of the battery.

[006...

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Abstract

The invention provides a battery SOC (state of charge) estimation method. The method comprises steps as follows: when a battery is in a static state, the SOC of the battery is acquired with an open-circuit voltage method; when the battery is in a dynamic state, the SOC of the battery is acquired according to an estimation formula obtained offline. By means of the battery SOC estimation method, the calculated amount during online estimation of SOC can be effectively reduced, consumption of calculation resources and occupation of storage space are reduced, energy consumption of equipment is reduced, and the SOC estimation speed is increased.

Description

technical field [0001] The invention relates to the field of battery measurement, in particular to a method for estimating battery charge. Background technique [0002] The electrodes of the lead-acid battery (Valve Regulated Lead Acid Battery, VRLA) are mainly made of lead and its oxides, and the electrolyte is a sulfuric acid solution. In the discharge state, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the charged state, the main component of the positive and negative electrodes is lead sulfate. [0003] Lead-acid batteries have the advantages of safe sealing, simple maintenance, long service life, stable quality and high reliability, and have been widely used in telecommunications, backup power supply (UPS), electronic switching systems, new energy power generation systems, electric control locomotives and other fields. [0004] Lead-acid batteries store energy electrochemically, so the remain...

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/388G01R31/387
Inventor 骆炎朱凤天吴佳骅许泽阳
Owner SHANGHAI ELECTRIC DISTRIBUTED ENERGY TECH CO LTD
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