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Method for testing power of state of power (SOP)

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

Active Publication Date: 2019-07-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for testing power of state of power (SOP)
  • Method for testing power of state of power (SOP)

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Embodiment Construction

[0064] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions 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 charg...

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Abstract

The invention provides a method for testing the power of a state of power (SOP). The method comprises the steps that the working time t and the U<c> are determined, constant-voltage discharging (charging) at the cut-off voltage U<c> for t, a reference power value P<r> is calculated by the current I at the t moment according to the formula of P<r>=I*U<c>, and the initial testing power P<0> is further obtained to try to test. According to the method for testing the power of the SOP, after the initial testing power P is obtained, the initial testing power P is compared with the cut-off voltage and adjusted, and finally an SOP value under a corresponding state of charge (SOC) and temperature is obtained; and the method for testing the power of the SOP has the beneficial effectsthat the largest output power of the different SOC under different temperature can be precisely obtained by an experiment method.

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 state of charge and ultimate 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...

Claims

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Application Information

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Patent Type & Authority Applications(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