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Real-time on-line estimation method for internal resistance of secondary battery

A secondary battery and internal resistance technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, instruments, etc., can solve problems such as increased manufacturing costs, increased management system volume, and inability to realize real-time internal resistance detection of batteries. Achieve real-time online estimation and good stability

Inactive Publication Date: 2012-09-19
HARBIN INST OF TECH +1
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the implementation of the AC method can only be applied to the non-working conditions of the battery, that is, it cannot realize real-time internal resistance detection during battery use.
And the physical quantities that can be directly acquired by the existing acquisition module unit of battery management are only parameters such as battery voltage, current, temperature, etc.
If you want to use the AC impedance method, you need to add hardware circuits, which will increase the volume of the management system and the manufacturing cost will also increase greatly

Method used

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  • Real-time on-line estimation method for internal resistance of secondary battery
  • Real-time on-line estimation method for internal resistance of secondary battery
  • Real-time on-line estimation method for internal resistance of secondary battery

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specific Embodiment approach 1

[0055] Specific implementation mode one: as Figure 1~2 As shown, a real-time online estimation method for the internal resistance of a secondary battery described in this embodiment is implemented according to the following steps:

[0056] Step 1. Establish a discrete battery state space model according to the circuit structure of the standard battery model; where, U L and I L Respectively represent the external terminal voltage of the battery (i.e. the load terminal voltage) and the total current flowing through the battery (i.e. the current flowing through the load); V OC It is used to represent the standard voltage source inside the battery model (that is, the open circuit voltage of the battery), and the ohmic internal resistance R of the battery is also connected in series in the circuit O , and by the polarization internal resistance R P with polarized capacitance C P A polarized circuit network composed of parallel connections, I P for flow through R P the polari...

Embodiment

[0099] The first step: for the same experimental data, the specific way of running the present invention under the Matlab computing environment and the specific way of estimating the ohmic internal resistance and polarization internal resistance of the secondary battery relying on the battery management unit on the actual vehicle, the obtained effect unanimous. The present invention uses Matlab software under the computer environment to write the above iterative algorithm as a Matlab program.

[0100] Step 2: The secondary battery used in the experiment is a lithium-ion battery cell with a capacity of 5Ah and cut-off voltages of 3.65V and 2.5V respectively. Put the secondary battery in the experimental platform, run the simulated working conditions, collect and record the voltage and current at the load end of the secondary battery. Using ampere-hour accumulation, the state of charge of the battery corresponding to the recording time is calculated. The measured voltage and c...

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Abstract

The invention relates to a real-time on-line estimation method for the internal resistance of a secondary battery, belonging to the technical field of secondary battery energy storage system control. The real-time on-line estimation method for the internal resistance of a secondary battery only needs to provide the terminal voltage and the load current of the battery without adding other auxiliary hardware circuits. The real-time on-line estimation method comprises the following steps of: constructing a state equation and an observation equation required for an algorithm by using the working principle of an extended Kalman filter based on an equivalent circuit model of a standard battery, taking the open-circuit voltage (VOC), the ohmic resistance (RO), the polarization resistance (RP) and the polarization current (IP) of the battery as estimated quantities, and taking the real-time measurements of the terminal voltage (VL) and the load current (IL) and a time interval delta t between two times of sampling as known quantities; and selecting a process excitation noise covariance and a measurement noise covariance according to the accuracy of a transducer, performing updating through iteration, and further estimating the ohmic resistance and the polarization resistance of the measured secondary battery in real time. Compared with the traditional resistance testing method, the real-time on-line estimation method has the advantages of real-time on-line estimation and good stability, and no hard testing circuit is additionally required.

Description

technical field [0001] The invention relates to a real-time online estimation method for the internal resistance of a secondary battery, belonging to the technical field of secondary battery energy storage system control. Background technique [0002] As an important characteristic parameter of the battery, the internal resistance of the secondary battery is closely related to its state of charge, state of health, temperature and other factors. At present, there are three main methods for internal resistance detection of secondary batteries: [0003] 1. DC method: In the case of offline, discharge the battery with a short-term large battery constant current to obtain the data of the voltage change value and current change value of the battery during this process, and then divide the voltage change by the current change. The internal resistance of the battery is obtained from . The results obtained by this method are relatively stable and reliable, but due to the off-line m...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 朱春波王天鸶逯仁贵裴磊
Owner HARBIN INST OF TECH
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