Bulging force and displacement component measuring device and method in lithium battery charging and discharging
A technology for measuring device and displacement component, which is applied in the field of measuring device for expansion force and its corresponding expansion displacement, can solve problems such as electrode material loss and diaphragm hole closure, and achieves the effects of low cost, elimination of frictional resistance, and simple structure
Active Publication Date: 2019-08-09
SOUTH CHINA UNIV OF TECH
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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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[0047] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0048] The first example is used to illustrate the measurement of the expansion force component along the thickness direction during the charging and discharging process of a hard case lithium battery. The lithium battery used is a square ternary lithium battery with a duralumin shell. The battery capacity is 2Ah, and its external dimensions are 62*44*5.5mm. The inside of the lithium battery is a wound battery, and the battery is only in contact with the aluminum shell on the side, so the battery expansion of the lithium battery during the charging and discharging process is mainly manifested as the outward displacement of the battery perpendicular to the side of the aluminum shell.
[0049] S...
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The invention discloses a bulging force and displacement component measuring device in lithium battery charging and discharging. The measuring device comprises a battery charging and discharging device, a thermotank, a lithium battery tester arranged in the thermotank and used to detect bulging force and displacement signals when a lithium battery is charged / discharged in different temperatures, currents and voltages, a data collector connected with the lithium battery tester and a computer and used to transmit collected current, voltage, temperature, bulging force and displacement signals tothe computer, and the computer used to synchronizing the collected displacement and bulging force signals according to the charged state of the lithium battery so as to obtain a curve between a bulging displacement component and a bulging force component along the thickness direction of the lithium battery with a hard shell in different pre-loads and at different temperatures. Different data signals can be collected simultaneously, basic data is provided for establishment of an electric, thermal, mechanical combined coupling model of the lithium battery, and basis is provided for establishmentof a battery management system with electric, thermal and mechanical 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...
Claims
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IPC IPC(8): G01R31/387G01R31/389G01L5/16G01B7/02G01B7/16
CPCG01R31/387G01R31/389G01L5/16G01B7/02G01B7/22
Inventor 曲杰李治均王超
Owner SOUTH CHINA UNIV OF TECH