Lithium battery in-situ force thermal coupling loading device for X-ray CT system

Abstract

The invention relates to a high and low temperature and pressure loading device, in particular relates to a lithium battery in-situ force thermal coupling loading device for an X-ray CT system, and belongs to the field of X-ray CT in-situ imaging. The device comprises a support frame, a mechanical loading shaft and a test box body. The test box body is supported in an original in-situ testing machine by the support frame; the test box body is connected with an energy box body through a silica gel hose, the energy box body is composed of a refrigeration compressor and a heating motor, and temperature control adopts PID automatic calculation to provide refrigeration and heating effects. The energy box body and the test box body are separated, so that the size of the test box body can be reduced as much as possible, and the testing precision of CT radiation is improved. According to the device, 200N mechanical loading can be carried out on a lithium battery at the environment temperature of -40 DEG C to 60 DEG C, and in-situ CT detection is realized in the mechanical and thermal loading processes.

Description

technical field [0001] The invention relates to a high-low temperature and pressure loading device, in particular to a lithium battery in-situ force-thermal coupling loading device used in an X-ray CT system, belonging to the field of X-ray CT in-situ imaging. Background technique [0002] With the rapid development of electric vehicles, the performance of lithium-ion batteries in extreme environments has become increasingly demanding. Due to the obvious expansion and contraction of the internal pole pieces of the lithium battery during the charge-discharge cycle, it will cause mutual extrusion and deformation between adjacent batteries. In addition, the use environment of lithium batteries requires it to have good performance in a wide temperature range, and extreme high and low temperature environments will lead to a decline in the performance of lithium batteries and changes in the internal structure of the battery. Therefore, it is very important to study the relationsh...

AI Technical Summary

Problems solved by technology

[0003] X-ray CT is a powerful tool to study the internal deformation of lithium batteries. The current X-ray in situ CT systems are mostly in situ mechanical loading or in situ temperature loading, and pressure or temperature loading alone cannot restore the real service environment of lithium batteries. It is also impossible to characterize the internal deformation of lithium batteries under the condition of mechanical and thermal coupling

The X-ray CT system has certain requirements on the size of the measured object. An oversized in-situ loading device will significantly reduce the quality of imaging, and the limited space size will affect the thermal insulation capacity and temperature loading accuracy of the in-situ temperature loading device. Therefore, it is difficult for the existing X-ray CT in-situ detection device to meet the force-thermal coupling loading and high imaging quality at the same time.

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