Method for testing and evaluating stability of internal structure of lithium battery during quick charging
A fast charging and internal structure technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem that the battery does not have a clear test method, and achieve the effect of short test process time, simple test method, and clear judgment indicators
Inactive Publication Date: 2020-12-29
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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Problems solved by technology
The current test technology does not provide a clear test method for the evolution of the internal structure of the battery
Method used
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Embodiment 1
[0054]The 18650 lithium ion battery is selected as the object of this method, the rated capacity is 2.5Ah, and the working voltage is 2.75V-4.2V. The specific steps are:
[0055](1) To measure the high-current constant-current charging capacity of lithium-ion batteries, the specific method is:
[0056](A) Discharge the battery to a cut-off voltage of 2.75V with a constant current of 2.5A;
[0057](B) Let stand to restore the battery temperature to room temperature;
[0058](C) 7.5A (3I1) Charge the battery with a constant current to a cut-off voltage of 4.2V, and record the charge capacity C0=1.78Ah;
[0059](2) Perform a rate charging cycle on the lithium ion battery, and repeat the steps (A)-(C) in the above step (1) for 100 times on the lithium ion battery;
[0060](3) Computed tomography test is performed on the lithium-ion battery to obtain cross-sectional image information of the internal electrodes of the battery. Obtain a cross-sectional image with the vertical symmetry axis of the cylindrica...
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The invention provides a method for testing the stability of an internal structure of a lithium battery during quick charging . The method comprises the following steps of measuring the large-currentcharging capacity of a lithium ion battery; carrying out rate charging circulation on the lithium ion battery; performing computed tomography test on the lithium ion battery to obtain battery internalelectrode section image information; and analyzing the computed tomography image information. The invention further comprises a method for evaluating stability of the internal structure of the lithium battery during quick charging. The method aims at the endurance capacity of the lithium battery to rapid charging and is based on the computed tomography technology, the internal structure stabilityof the lithium ion battery during rapid charging can be effectively tested, more accurate data support is provided for the process upgrading and evaluation technology development of the lithium battery. and evaluation indexes are provided for the structural stability of the lithium battery.
Description
Technical field [0001] The invention belongs to the field of new energy technology, and in particular relates to a method for testing and evaluating the stability of the internal structure of lithium battery rapid charging. Background technique [0002] Lithium batteries are widely used in portable electronic devices such as laptops, cameras, and mobile phones, as well as wearable devices such as smart watches and Bluetooth headsets, due to their advantages of high energy density and long cycle life. Furthermore, as the energy density of lithium-ion batteries has gradually increased in recent years, they have also been gradually promoted as power batteries in the field of new energy vehicles. The use of power batteries has different requirements from the use of electronic devices. One of the important issues is the charging time. Traditional fuel vehicles only take a few minutes to complete the refueling process at a gas station. In order to ensure that electric vehicles do...
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IPC IPC(8): G01N23/046G01B15/06
CPCG01B15/06G01N23/046G01N2223/03G01N2223/607
Inventor 马天翼王芳魏墨晗高孟洋樊彬张晋杰刘鹏张良
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD