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Method for testing internal connection looseness of power battery

A technology of internal connection and power battery, which is applied in the direction of measuring electricity, measuring electrical variables, and testing mechanical components, etc. It can solve the problems of increased contact resistance at the connection, achieve economical operation, accurate energy distribution calculation, and facilitate electrical design and Optimized effect

Inactive Publication Date: 2019-06-14
恒大新能源汽车(天津)有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

When the connection inside the power battery is loose, it will cause the contact resistance at the connection to increase

Method used

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  • Method for testing internal connection looseness of power battery

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Embodiment Construction

[0017] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0018] see figure 1 , a method of testing the looseness of the internal connection of the power battery, first of all, it is necessary to test the relationship between the torque change and the resistance of the connection. According to the material and structure of the connection, the resistance value of the connection of the sample under different torques is recorded respectively, and the data analysis is carried out. In the second step, it is necessary to calculate the internal resistance of the battery cell, wiring harness, insurance and other components, as well as the resistance of the high-voltage circuit inside the entire battery. After the electric vehicle is driven on the road, subtract the internal resistance of the component from...

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Abstract

The invention relates to a method for testing internal connection looseness of a power battery, and belongs to the technical field of new energy automobiles. The method is characterized by at least further comprising the steps that 1, firstly a plurality of times of testing are conducted, and a relationship between torque change and resistance of a connection part is established according to testresults; 2, internal resistance of a power core, a wiring harness and a safety component and resistance of a high-voltage loop inside the whole battery are calculated; 3, after an electric vehicle runs on a road, the internal resistance of the component is subtracted from the resistance of the internal loop of the whole battery, and the resistance of a connection loosened part of the internal is obtained; and 4, whether the internal connection of the battery is loose or not is determined according to the change of a resistance value at the connection part. According to the method for testing internal connection looseness of the power battery, an influence rule of the torque on the resistance is found by measuring the change of the resistance at the connection part under different connection torques, and then the influence rule is used for judging whether the internal connection of the power battery is loose or not is judged after the electric vehicle is running.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles; in particular, it relates to a method for testing the internal connection looseness of a power battery. Background technique [0002] New energy vehicles refer to the use of unconventional vehicle fuels as power sources (or the use of conventional vehicle fuels, the use of new vehicle power devices), integrated vehicle power control and advanced technology in driving, the formation of advanced technical principles, with Automobiles with new technology and new structure. New energy vehicles include pure electric vehicles, extended-range electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, and other new energy vehicles; as we all know, pure electric vehicles are an important part of new energy vehicles; pure electric vehicles A car (Blade Electric Vehicles, BEV) is a car that uses a rechargeable battery as the energy storage power source. [0003]...

Claims

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Application Information

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IPC IPC(8): G01R31/385G01M13/00
Inventor 赵培
Owner 恒大新能源汽车(天津)有限公司
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