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Aging early warning method of power lithium battery

A lithium battery and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as lack of versatility, and achieve the effect of timely warning of aging status

Inactive Publication Date: 2018-03-02
镇江恒驰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it can only be used for a certain type of lithium battery. After changing a lithium battery, it is necessary to re-collect data to build a model, which is not universal.

Method used

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  • Aging early warning method of power lithium battery
  • Aging early warning method of power lithium battery
  • Aging early warning method of power lithium battery

Examples

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Embodiment 1

[0026] Such as Figure 5 , in this example, how the content of the present invention is applied to the health status monitoring and aging prediction of the power lithium battery of a new energy electric vehicle will be introduced.

[0027] When the new energy electric vehicle turns the key to power on, the power on is delayed by 500ms. First use the pulse current method to generate a pulse current with a width of 2ms and a current of no more than 20A to measure the ohmic internal resistance of the power lithium battery.

[0028] After the internal resistance measurement is completed, the measured internal resistance value is uploaded to the database on the server or cloud platform through the ECU with Internet function; every time the vehicle is driven, the internal resistance of the power lithium battery is automatically measured before the vehicle is powered on, so that The ohmic internal resistance data during the entire life cycle of lithium batteries are stored in the da...

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Abstract

The invention discloses an aging early warning method of a power lithium battery. A power type MOSFET and a current limit resistor are connected with two ends of a battery pack, the MOSFET tube is conducted by 2ms under the control action of a controller, a single pulse current with width of 2ms is generated in the battery and the current limit resistor, and internal ohmic resistance of the lithium battery can be acquired according to voltage difference and a resistance value of the current limit resistor. Abnormal value elimination and data smooth processing for the power lithium battery ohminternal resistance data acquired in real time can be carried out, integral data is selected to carry out linear trend fitting of acquired gradient contrast to determine an aging inflection point, andearly warning of the battery health state is carried out. The method is advantaged in that internal ohmic resistance measurement of the power lithium battery can be simply and rapidly carried out, aging early warning of the power lithium battery is realized through utilizing the measured internal ohmic resistance data, and the method is of great importance to facilitating healthy development of the electric automobile industry.

Description

technical field [0001] The invention relates to the field of ohmic internal resistance measurement and health state prediction of a power lithium battery, in particular to the ohmic internal resistance measurement of a power lithium battery and an algorithm for finding an aging inflection point. Background technique [0002] The Thirteenth Five-Year Plan clearly stated that "implement the promotion plan of new energy vehicles and encourage the use of new energy vehicles in urban buses and taxis." New energy vehicles are increasingly sought after by the market. In the research and development process of electric vehicles, there are three key technologies: 1. Electric vehicle technology; 2. Electric drive and control technology; 3. Power battery technology. So far, electric vehicle technology and electric drive and control technology have been well resolved, but the power battery as the power source of electric vehicles, the performance can not meet the requirements of electri...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/392G01R31/3648G01R31/389
Inventor 张悦诚徐升荣曾洁张金华
Owner 镇江恒驰科技有限公司
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