Measurement method for battery welding quality

A technology of welding quality and measurement method, applied in the direction of material resistance, etc., can solve the problem of battery secondary damage accuracy, etc., and achieve the effect of rapid measurement

Inactive Publication Date: 2018-06-19
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention is to solve the problem that the existing battery welding quality test method will ca

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  • Measurement method for battery welding quality
  • Measurement method for battery welding quality
  • Measurement method for battery welding quality

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Specific embodiment

[0026] In this embodiment, the battery adopts an 18650 lithium iron phosphate 1.5Ah / 3.2V single battery, and its electrode cap is circular, with a diameter of 12 mm, and a flat surface. The voltage detector is a voltage detection device that receives the signal from the controller and collects the voltage V ad . Specifically, in this embodiment, the high-speed analog-to-digital converter AD9220 of Analog Devices is used to realize signal collection. The highest sampling rate of AD9220 can reach 10 MHz, and an external crystal oscillator of 8 MHz is used, and signal storage is realized by sampling inside the FPGA. The voltage signal of the battery module can be collected and converted into a digital signal for output. The current source adopts ZM20-12ET switching controlled DC constant current power supply, the controlled output current range is 1-10A, the maximum output voltage is limited to 3V, and the current accuracy is 0.2%. It can accept the control s...

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Abstract

Relating to the battery measurement field, the invention provides a measurement method for battery welding quality, and aims to solve the problem that the existing battery welding quality test methodcan cause secondary damage or poor accuracy to batteries. The measurement method for battery welding quality provided by the invention includes: inputting current Ibc between a battery electrode and an electrode slice welded on the electrode, detecting the voltage Uad between the battery electrode and the electrode slice to acquire the resistance value Rx of a solder joint between the battery electrode and the electrode slice, judging whether the resistance value of the solder joint is smaller than a standard threshold, if the Rx is smaller than the standard threshold, indicating excellent welding quality, otherwise indicating poor welding quality. The measurement method provided by the invention is suitable for detection of battery welding quality.

Description

technical field [0001] The invention belongs to the field of battery measurement. Background technique [0002] At present, batteries are more and more widely used in various fields such as electric vehicles and energy storage, covering almost all fields of life, production, and scientific research. Especially recently, with the rapid development of new energy vehicles at home and abroad, the demand for batteries is increasing, and the performance requirements for batteries are also getting higher and higher. In the case of large-scale application of batteries, it is often necessary to connect multiple single batteries in series and parallel to form a battery module. Therefore, it is necessary to weld the positive and negative electrodes of the battery. The quality of welding directly affects the performance of the battery module, and even directly affects the safety and security of the battery. Service life, especially for electrode welding of small cylindrical batteries o...

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Application Information

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IPC IPC(8): G01N27/20
CPCG01N27/20
Inventor 李然姚杰
Owner HARBIN UNIV OF SCI & TECH
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