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Method for determining power battery SOP

A power battery and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as the method of obtaining the maximum power, and achieve accurate and reliable measurement

Inactive Publication Date: 2018-03-30
江西优特汽车技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some other methods in the prior art, such as patent application 201610799603.1, need to obtain the maximum power a priori, but there is no specific method for obtaining the maximum power

Method used

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  • Method for determining power battery SOP

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Embodiment Construction

[0023] The method for determining the SOP of the power battery of the present invention is a method that can essentially determine the maximum bearable power of the battery. Taking a ternary lithium battery 8Ah cell as an example, the specific processing steps are as follows:

[0024] Step 1: Select the temperature points as 0℃, 5℃, 10℃, 20℃, 35℃, 45℃, 50℃, 55℃;

[0025] The selected SOC points are 10%, 20%, 30%, 50%, 80%, 90%, 100%. Select SOH as 100%, 90%, 85%, 80%, 70%;

[0026] The selected duration is 10 seconds, 20 seconds, and 35 seconds. To select the polarization voltage, fully charge the battery according to the standard working conditions, use the rated cycle life rate, 80% cycle life rate, 50% cycle life rate, and 30% cycle life rate to discharge the battery to obtain the polarization voltage curve. The polarization voltage of the SOC point should be selected as the test polarization voltage.

[0027] Step 2: Adjust the battery to the target temperature, SOC and SOH.

[0...

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Abstract

The invention discloses a method for determining a power battery SOP, which includes steps of step 1, selecting temperature, polarization voltage, duration time, SOC and SOH of a measurement target; step 2, adjusting the battery to the target temperature, SOC and SOH; step 3, adjusting the battery to the target initial polarized voltage; step 4, acquiring discharge coulombic efficiency at set timeunder an appointed rate; step 5, acquiring the charge coulombic efficiency at set duration time under the appointed rate; step 6, performing curve line and curve face function fitting on results acquired in steps 4 and 5; step 7, acquiring battery damage evaluation of given power under a given condition according to the fitting result, and acquiring the maximum bearable power of the battery. Themethod for determining the power battery SOP has the advantages of directly carrying out quantitative evaluation on battery volume loss by coulombic efficiency, providing a reliable basis for the battery power used by the control strategy, setting the initial polarized voltage condition; the method includes the influence of using history on the SOP, thus the measurement is more exact and reliable.

Description

Technical field [0001] The invention relates to the field of electric vehicles, in particular to the field of power battery management of electric vehicles. Background technique [0002] Due to the intensification of energy and environmental crises, new energy vehicles have developed rapidly this year, and lithium batteries, as the mainstream energy storage energy for electric vehicles, have also received extensive attention for their management systems. In battery management, the battery state parameters SOC (remaining power), SOH (remaining life), and SOP (power endurance) are all very important state parameters. The technology development of SOC and SOH has attracted wide attention. However, there are few technologies available for real-time estimation of the state of power (SOP) of lithium batteries. SOP represents the battery's ability to withstand charging and discharging power. The accurate estimation of SOP can allow electric vehicles to gain greater power freedom under ...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/385
Inventor 李世明王世强胡庆军张叶鑫
Owner 江西优特汽车技术有限公司
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