Method for estimating state of health and state of charge of storage battery

A state of charge and storage battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of high cost and unsuitability for backup power systems, and achieve high accuracy, high precision, and cost reduction.

Active Publication Date: 2011-11-23
BEIJING CENTURY REAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] Electrochemical impedance analysis: Electrochemical impedance analysis is only suitable for portable equipment, and the cost is expensive, so it is not suitable for the application field of backup power system

Method used

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  • Method for estimating state of health and state of charge of storage battery
  • Method for estimating state of health and state of charge of storage battery
  • Method for estimating state of health and state of charge of storage battery

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Embodiment 1

[0050]Estimation starts when a discharge starts and there has been sufficient charging time before to ensure that the battery is fully charged. It is divided into two branches to estimate SOC and SOH at the same time: branch one estimates SOC and SOH based on an adaptive model; branch two estimates SOC based on one of the methods of the normalized voltage curve and the voltage curve of the remaining capacity domain and SOH; in the second branch, whether to use the voltage curve method based on normalization or the voltage curve method in the remaining capacity domain is judged based on whether the voltage has dropped sharply and then risen at the initial stage of discharge. In the event of a steep drop and then a rise, it is preferred to estimate based on the normalized voltage curve method because its accuracy is slightly higher. Branch one and branch two run in parallel. As long as the depth of discharge exceeds 30%, branch 2 can estimate SOH, and continue to give SOC and u...

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Abstract

The invention discloses a method for estimating a state of health (SOH) and a state of charge (SOC) of a storage battery. The method is applied to a backup power system. The method comprises the following steps of: estimating the SOH and the SOC of the storage battery by using two branches simultaneously; comparing deviation of estimated values of the two branches; and selecting and determining the estimated values. In the method, a backup battery pack is not needed and measurement can be finished on line; quantitative measurement can be realized and the accuracy is high; and during measurement, complicated equipment is not needed, so that the cost is reduced.

Description

technical field [0001] The invention relates to a method for estimating the SOH (State Of Health) and SOC (State Of Charge) of a storage battery applied to a standby power system. Background technique [0002] Batteries play an important role in backup power systems as the last line of defense for reliable power supply. Due to long-term float charging and lack of maintenance, the performance of some batteries gradually deteriorates with use. Since the batteries in the backup power system are used in series, defective batteries will lead to uneven distribution of battery cell voltage during charging and discharging, thus failing to meet the standard charging and discharging, further accelerating the aging of other batteries, and making the entire battery pack reliable. sex decline. Knowing the SOH of each battery is therefore crucial. Due to the high electrochemical nonlinearity and dynamic characteristics of the battery, as well as the application characteristics in the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 朱晨郑兴凯
Owner BEIJING CENTURY REAL TECH CO LTD
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