Method and device for online updating OCV curve of battery

A discharge curve and curve technology, applied in the field of online update battery OCV curve, can solve problems that do not conform to actual usage conditions, and achieve the effect of ensuring real-time monitoring

Active Publication Date: 2018-11-06
HIGER
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AI Technical Summary

Problems solved by technology

The OCV curve is usually obtained by offline calibration, but the offline calibration method is only for batteries that have not left the factory. It is not suitable for actual use to obtain the OCV curve by using this offline calibration method for aging batteries on new energy vehicles. of the situation
The estimation of the battery SOC after aging depends on the battery OCV after aging, but there is no method to update the battery OCV online

Method used

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  • Method and device for online updating OCV curve of battery
  • Method and device for online updating OCV curve of battery
  • Method and device for online updating OCV curve of battery

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Embodiment

[0034] A device for updating battery OCV curves online according to the present invention, comprising:

[0035] A battery internal resistance model design module: design the battery internal resistance model, set a certain range of SOC change window, when the change window is within this range, the internal resistance and OCV are constant values;

[0036] A discharge curve drawing module: measure the driving discharge curve to obtain the current and voltage spectrum of the SOC discharge;

[0037] 1. OCV curve drawing module: take the data of different currents and corresponding voltages in the SOC change window in the working condition and perform least square analysis to obtain a set of OCV values ​​and battery internal resistance values ​​of different marks in the SOC change window, and analyze the OCV curve.

[0038] Such as figure 1 As shown, the device performs an online method for updating the battery OCV curve, including:

[0039] Step 1. Design the battery internal r...

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Abstract

The invention discloses a method for online updating the OCV curve of a battery, comprising: designing a battery internal resistance model and setting a SOC change window with a certain range, whereinwhen the SOC change window is within the range, the internal resistance and the OCV are fixed values; measuring a driving discharge curve and obtaining SOC discharging current and voltage road spectrums; performing least square method analysis on different current and corresponding voltage data in the SOC change window in a working condition to obtain a group of differently marked OCV values andinternal resistance values in the SOC change window, and obtaining the OCV curve. The method can online updates the OCV curve of the battery, can obtain the OCV curve of the aging cell of a new energyvehicle, further strengthens the detection of the battery capacity and the battery internal resistance attenuation of the new energy vehicle, and has a positive effect on promoting the battery systemdetection of new energy vehicle.

Description

technical field [0001] The invention belongs to the technical field of power battery management, and in particular relates to a method and device for updating battery OCV curves online. Background technique [0002] An electric vehicle is a means of transportation with an electric motor as the power device and a battery as the energy storage device. The development of electric vehicles is an emerging strategic industry that countries have vigorously developed after the energy crisis and financial crisis. Therefore, battery management is extremely important. The remaining capacity of the battery pack (SOC) is an important parameter of the battery management system, the most important reference for battery usage route planning, and the basis for power management in battery management. [0003] The estimation method of open-circuit voltage correction plus ampere-hour integration and the Kalman filter algorithm based on the battery model are usually used for the estimation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36B60L11/18
CPCG01R31/36Y02T10/70G01R31/3842G01R31/396G01R19/16528G01R31/367G01R27/08
Inventor 时玉帅张巍王起亮张建利方兰兰
Owner HIGER
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