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A method of testing sop power

A power and constant power technology, applied in the field of battery state estimation in battery management systems, to achieve the effect of accurate output power

Active Publication Date: 2021-12-14
UNIV OF SHANGHAI FOR SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The second type of SOP estimation method based on the dynamic model comprehensively considers the battery voltage, current, and SOC constraints, and estimates the peak power based on the first-order RC model under dynamic conditions. However, there is currently no method that can be obtained more accurately Method of battery SOP status

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Embodiment Construction

[0064] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0065] Such as figure 1 As shown, the present invention proposes a kind of method of testing SOP power, comprises the following steps:

[0066] Step: 1: Discharge the battery at a constant voltage and record the constant voltage U cL and the current at the end of discharge of the battery in each state of charge;

[0067] Step 1.1: Adjust the state of charge of the battery, discharge the battery with a constant current of a% SOC;

[0068] Step 1.2: Lower cut-off voltage U cL Working time on the battery t p constant voltage discharge;

[0069] Step 1.3: Record working time t p The current I at the end UL ;

[0070] Step 1.4: Adjust the state of charge of the battery to the state of charge required for the next step;

[0071] Step 1.5: Repeat steps 1.2 and 1.3 until the state of charge ...

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Abstract

The present invention proposes a kind of method of testing SOP power, by working time t p and U c The determination to cut-off voltage U c Constant voltage discharge (charge) electricity t p , with t p Current I at time U Preliminary calculation of reference power value P r =I U × U c , and further get the initial test power P 0 Carry out test attempt, the present invention is after obtaining initial test power P, by comparing and adjusting with cut-off voltage, finally obtains the SOP value under corresponding SOC and temperature, and the advantage of the present invention is that can more accurately draw different by experimental method Maximum output power for different SOC at temperature.

Description

technical field [0001] The invention relates to the technical field of battery state estimation of a battery management system, in particular to a method for testing SOP power. Background technique [0002] Although lithium-ion battery technology continues to improve, it still cannot fully meet the needs of use in terms of life and safety issues. The charge state and limit discharge capacity of the battery have an important impact on the performance of electric vehicles. Therefore, it is necessary to accurately estimate the a% SOC state of charge (state of charge) and power state SOP (state of power) of the lithium battery. [0003] SOP is used to characterize the peak charge and discharge power that the battery can withstand at the current moment. Through the estimation of SOP, the current working state of the battery pack can be evaluated: when the electric vehicle starts or accelerates, it can be estimated whether the on-board battery pack meets the requirements of the S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/385G01R31/388
Inventor 郑岳久杨新波金昌勇王晶晶
Owner UNIV OF SHANGHAI FOR SCI & TECH