Measuring device and method for expansion force component and displacement component during charging and discharging of lithium battery

Abstract

The invention discloses a measuring device for expansion force component and displacement component in lithium battery charge and discharge, comprising: battery charge and discharge equipment; Expansion force and displacement signals during charge and discharge at different temperatures, currents, and voltages; data acquisition equipment is connected to the lithium battery test device and the computer through wires, and is used to collect the collected current, voltage, temperature, expansion force, and displacement signals Send it to the computer; the computer is used to synchronize the collected displacement and expansion force signals according to the state of charge of the lithium battery, and obtain the expansion displacement component-expansion force component of the hard shell lithium battery with different preloads at different temperatures along the thickness direction curve. The invention can realize the simultaneous acquisition of multiple data signals, provide basic data for establishing a multi-physics coupling model of electricity, heat, and mechanics of lithium batteries, and lay a foundation for establishing a battery management system including electricity, heat, and force signals.

Description

technical field [0001] The invention relates to a device and method for measuring expansion force and corresponding expansion displacement, in particular to a measurement device and method for expansion force component and corresponding expansion displacement component along the thickness direction during charging and discharging of a hard shell lithium battery. [0002] technical background [0003] In recent years, with fluctuations in oil prices, reduction of natural resources, climate change and increasingly stringent emission standards, the automotive industry has gradually transformed into research and development of environmentally friendly and efficient vehicles, so electric vehicles, hybrid electric vehicles and plug-in hybrid Power electric vehicles are endowed with great hope. The advantages of lithium batteries such as high power density, high energy density and low self-discharge rate make them ideal for a variety of applications ranging from small portable elect...

AI Technical Summary

Problems solved by technology

However, most of the current studies are carried out at the electrochemical and thermodynamic level of lithium batteries, such as the various competing aging mechanisms that occur in lithium batteries, such as SEI growth, electrode material loss and separator pore closure.

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