Continuing from last week’s article, this week we are going to discuss other parameters.

3. Influence of charge and discharge rate

The charge and discharge rate characterizes the charge and discharge current of the lithium- ion battery. Therefore, the charge and discharge rate must have a very significant impact on the heat generation power of the lithium-ion battery. , the final temperature and temperature rise of the lithium-ion battery at different charge and discharge rates, and Table 6 calculates the heating power of the lithium-ion battery at different rates through the temperature rise data. It can be seen from Table 6 that the heat generation power of lithium- ion batteries is greatly affected by the charge and discharge rate. At a rate of 0.5C, the average heat generation power is only 2.31W. When the charge and discharge rate is increased to 0.8C, the average heat generation rate the power has been increased to 5W, increased to 1.5C, reached 12.83W, and further increased to 5C, and the average heat generation power has reached 58.51W.

On the basis of the above experimental data, the model was used to simulate the temperature change of the lithium-ion battery during the charging and discharging process. For the heat generation process in the reaction, the fitting result is only 1.17°C higher than the experimental data during the charging process, and the fitting result is 1.1°C higher than the experimental data during the discharging process.

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