Power battery service life monitoring method based on on-line internal resistance testing

A power battery, online testing technology, applied in the direction of measuring electricity, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as poor practicability

Active Publication Date: 2015-06-03
西安正中德信息科技有限公司
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Problems solved by technology

[0006] In order to overcome the shortcomings of poor practicability of existing power battery life testing meth...

Method used

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  • Power battery service life monitoring method based on on-line internal resistance testing
  • Power battery service life monitoring method based on on-line internal resistance testing
  • Power battery service life monitoring method based on on-line internal resistance testing

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Embodiment Construction

[0051] refer to figure 1 . The specific steps of the power battery life monitoring method based on the internal resistance online test of the present invention are as follows:

[0052] 1. Use the terminal voltage-current value measured when the power battery is at the rated load when driving, and calculate the current internal resistance value through calculation; perform data processing on the internal resistance value measured multiple times to estimate the life of the current power battery parameter.

[0053] (1) In the full-load working state of the power battery under test, measure the voltage and current values ​​in real time, and use Ohm's law to obtain the reference value of internal resistance in real time; after multiple collections, a sequence of reference value of internal resistance can be obtained. At the same time, the current auxiliary parameters of the power battery are collected: battery activation time, actual towing time, time interval before use, and cur...

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Abstract

The invention discloses a power battery service life monitoring method based on on-line internal resistance testing, and aims to solve the technical problem that the conventional power battery service life testing method is poor in practicability. According to the technical scheme, the power battery service life monitoring method comprises the following steps: under the condition of rated load, testing a voltage-primary discharge current value of a power battery, thereby obtaining a present operation state value of the power battery; on the basis of continuous testing, calculating a primary value of the internal resistance of the power battery; subsequently, meeting optimization target which meets 'minimum square error' by using a least square fit method, and working out a primary tested value R (i) of the internal resistance of the power battery; testing for multiple times, thereby obtaining as string of progressive charge sequence {R(i)} i=1, 2, ..., m which can reflect the change rule of the internal resistance of the power battery within a relatively long period; finally, with the combination of historical records such as the service starting time and the utilization rate of the power battery, implementing data processing so as to obtain the present service life state of the power battery, and predicting the change and the available degree of the service life of the power battery in a future period. The power battery service life monitoring method is simple and practical, and avoids off-line measurement.

Description

technical field [0001] The invention relates to a power battery life testing method, in particular to a power battery life monitoring method based on internal resistance online testing. Background technique [0002] Failure or insufficient capacity of the power storage battery may cause major accidents. Therefore, the detection and monitoring of power batteries has always been a hot topic of research at home and abroad. The main basis for detecting whether the service life of the power battery is over is whether the remaining capacity of the power battery meets the working requirements. It is related to structural parameters, such as electrolyte density, battery internal resistance, etc. For the test of power battery life, it can be mainly divided into two categories: traditional method and method based on internal resistance test. [0003] According to Lu Feng of Beijing Jiaotong University in the article "Discussion and Application of Locomotive Battery Testing Technolo...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/08
Inventor 景占荣羊彦刘莉高田
Owner 西安正中德信息科技有限公司
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