Method for obtaining surplus energy of battery based on SOC-OCV curve

A SOC-OCV and residual energy technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of time-consuming and labor-intensive residual energy, and achieve the effect of reducing resource release, reducing resource consumption, and improving calculation accuracy

Active Publication Date: 2019-04-26
安徽优旦科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the existing problem of inaccurate acquisition of remaining energy or time-consuming and labor-consuming acquisition of relevant data, the present invention provides a method for obtaining battery remaining energy based on the SOC-OCV curve

Method used

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  • Method for obtaining surplus energy of battery based on SOC-OCV curve
  • Method for obtaining surplus energy of battery based on SOC-OCV curve
  • Method for obtaining surplus energy of battery based on SOC-OCV curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method to obtain the remaining energy of the battery based on the SOC-OCV curve, such as figure 1 shown, including the following steps:

[0045] S1. Obtain the SOC-OCV curves at different temperatures by using the charging and discharging cabinet and the high and low temperature box;

[0046] The rated capacity (Q0 in Formula 1) and the total energy of the battery (TotalEnergy in Formula 2) at each temperature can be obtained through the temperature-capacity curve and the temperature-energy curve;

[0047] S2. Calculate the residual energy of each SOC corresponding point in the SOC-OCV curve at different temperatures according to the following formula, as figure 2 Shown:

[0048] S21. First calculate the released energy UsedEnergy of the battery:

[0049]

[0050] S22. Calculate the remaining energy LeftEnergy of the battery again:

[0051] LeftEnergy=(TotalEnegry-UsedEnergy)×SOH formula (2)

[0052] In formula (1) and formula (2): U a is the voltage correspon...

Embodiment 2

[0107] Embodiment 2 is further optimized on the basis of the scheme of Embodiment 1, and the interval between the two charge states a and b is set to 5%-10%, preferably 5% and 10%.

[0108] For the integral itself, the more intervals are divided, the higher the accuracy; but for the SOC-OCV curve, too many intervals will increase the test workload. A large number of experimental studies have found that when the SOC test interval is selected to be 5%-10%, it is possible to ensure the calculation accuracy of the remaining energy and reduce the test workload.

Embodiment 3

[0110] Embodiment 3 is further optimized on the basis of Embodiment 1. In step S2, a process of self-learning is added to the SOC-OCV curves at different temperatures. The specific steps are as follows:

[0111]S23. Calculate the energy actually released by the battery:

[0112] When the SOC is 90%, the energy actually released by the battery at this time is:

[0113] In the formula: U is the voltage at the current moment, I is the current at the current moment, dt is the task running period for calculating the accumulated discharge energy, T 1 It is SOC90_T, indicating the time from full charge to discharge to SOC 90%;

[0114] S24, replace UsedEnergy with E, bring into formula (2), obtain the corresponding residual energy LeftEnergy of 90% SOC SOC_90 ';

[0115] S25. Calculate LeftEnergy SOC_90 ’ and LeftEnergy SOC_90 The difference between ΔE, when ΔE is greater than 3% TotalEnenrgy*SOH, 90% SOC at the current temperature corresponds to the new remaining energy New...

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Abstract

The invention discloses a method for obtaining surplus energy of a battery based on an SOC-OCV curve and belongs to the field of vehicle batteries. The method comprises the following steps that S1, atemperature-rated capacity curve, a temperature-total energy curve and SOC-OCV curves at different temperatures are collected; S2, SOC-surplus energy curves at different temperatures are obtained; S3,the SOC-surplus energy curves at different temperatures are input to a BNS program; S4, query is conducted according to a two-dimensional table to obtain the real-time surplus energy. According to the method, the SOC-OCV curves are used for calculating an integral of released energy to obtain the surplus energy of the battery for the first time, and the surplus energy of the battery at differenttemperatures and SOCs is obtained. According to the method, the accurate surplus energy can be obtained just by testing the most basic battery characteristic, the workload of battery testing is lowered, and the real-time surplus energy of the battery can be obtained in the vehicle operation process.

Description

technical field [0001] The invention belongs to the field of automobile batteries, and in particular relates to a method for obtaining battery residual energy based on an SOC-OCV curve. Background technique [0002] The power battery is a device that converts chemical energy into electrical energy. The conversion process is a complex physical and chemical reaction process. Calculating the remaining energy of the power battery is useful for estimating the remaining mileage of an electric vehicle, avoiding that the vehicle cannot be driven due to no electricity and Timely charging of the vehicle, etc. is of vital importance. [0003] SOC, the full name is State of Charge, is used to reflect the remaining capacity of the battery, and its value is defined as the ratio of the remaining capacity to the battery capacity. The SOC-OCV curve is generally used to estimate the SOC value. It is mainly based on the relationship between the OCV of the battery and the lithium ion concentra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/387
Inventor 来翔彭勇俊习清平王晓东
Owner 安徽优旦科技有限公司
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