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On-line measurement method for internal resistance of lithium battery

A measurement method, lithium battery technology, applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of battery life impact, cumbersome measurement steps, etc., and achieve popularization and high practicability. , Practicality, high efficiency and energy saving effect

Inactive Publication Date: 2016-01-27
国安新能源(荆门)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages and disadvantages. The common problem is that the measurement steps are cumbersome, and some measurement methods have measurement errors that cannot be ignored, and even some measurement methods (due to the long discharge time of the battery, etc.) have a certain impact on the battery life.

Method used

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  • On-line measurement method for internal resistance of lithium battery

Examples

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Comparison scheme
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Embodiment 1

[0041] Embodiment 1 of the present invention provides a method for measuring the internal resistance of an online lithium battery, including:

[0042] Such as figure 1 , V1 in the circuit diagram is the AC voltage of the set frequency, C1 and C2 are DC blocking capacitors, I1 is the constant current power supply, and RX is the internal resistance of the battery. Add such as figure 1 The circuit for measuring the AC internal resistance of the battery is shown.

[0043] 1. When the electric vehicle is powered on and running, the lower computer of the BMS battery management system provides a set of constant current sources. The constant current sources are used to provide working power for the internal resistance measurement circuit, so that the key point voltage can be obtained and measured by the measurement circuit. V2 and V3;

[0044] 2. Use the voltage measurement terminals A, B and C to obtain the key point voltages V2 and V3, and the key points are set in the internal...

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Abstract

The invention relates to an on-line measurement method for internal resistance of a lithium battery. The on-line measurement method concretely includes the steps that step1, an internal resistance measurement circuit is additionally arranged in a battery management system of an electric automobile; step2, the internal resistance measurement circuit is used for obtaining voltage of key points; step3, a formula is utilized for calculating the alternating-current internal resistance of the lithium battery. The on-line measurement method for detecting the internal resistance of the lithium battery has the advantages of being high in rapidness and practicability and efficient and saving energy, and can guarantee that the electric automobile detects the internal resistance of the lithium battery under any condition, and the internal resistance is used for evaluating the health degree of the battery, estimating the service life of the battery and performing SOC estimation or can be used for evaluating whether the battery is damaged.

Description

technical field [0001] The invention relates to the field of electric vehicle power batteries, in particular to the technical field of electric vehicle batteries, in particular to a method for measuring the internal resistance of an online lithium battery. Background technique [0002] Lithium batteries have the characteristics of high energy, long service life, high rated voltage, high power tolerance, high and low temperature adaptability, and environmental protection. They are widely used in various industries such as communications and transportation. The capacity of the battery is closely related to the internal resistance of the battery. Generally speaking, the larger the capacity of the battery, the smaller the internal resistance. If the internal resistance of the battery is large, a large amount of Joule heat will be generated, which will cause the temperature of the battery to rise, resulting in a decrease in the battery discharge operating voltage and a shortened ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 朱兴国邓俊
Owner 国安新能源(荆门)有限公司
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