Lithium-ion battery cell temperature estimation -Lithium - Ion Battery Equipment

Lithium-ion battery cell temperature estimation -Lithium - Ion Battery Equipment

As a core component of digital products and electric vehicles. Lithium-ion batteries in these products typically consist of multiple cells. During use, charge and discharge performance and battery life may be significantly reduced due to increased internal core temperature of the battery cells.

Especially for power lithium batteries in the automotive field, accurate cell temperature estimation and monitoring are critical to the performance and life of the entire battery system.(Lithium - Ion Battery Equipment)

Recently, the U.S. Patent and Trademark Office granted U.S. Patent 10,230,137 to the U.S. Army on March 12, 2019. This patent can estimate the temperature of the cells in the battery pack.

Gaogong Lithium Battery Technology and Use learned that this patent provides a more accurate battery pack core temperature estimation method that can be used for battery thermal management system operations and helps maintain safety, performance and life.

At present, the monitoring of cell temperature is still inaccurate and reliable, and even far from the actual situation in some cases. Taking the existing technology as an example, one way is to measure the surface temperature of the battery cell and use it as its core temperature. But this can be very inaccurate, as the temperature between the surface and the core can differ by 30°C.

Alternatively, a temperature sensor is installed in the inner core of the battery cell for temperature measurement. However, it would be too costly and impractical to deploy such temperature sensors for hundreds or even thousands of battery cells.

In order to solve the above technical problems, the patent proposes the following processing method: The improved method of estimating the battery temperature includes measuring the surface and coolant temperature, and inputting the internal resistance of the mathematical formula.

In detail, the method of estimating the core temperature of the battery cells in the battery pack may include the following steps:

1. Receive the surface temperature of the one or more battery cells, receive the current of the one or more battery cells, receive the inlet temperature of the coolant supplied to the battery pack, and receive the rate of the coolant.

2. Estimates are made including the cell aggregated internal resistance, the cell aggregated conduction resistance between the core and the surface of the cell, and the convective resistance between the cell surface and the coolant.

3. Estimate the core temperature of the battery cell based on the received and estimated values ​​from the previous steps.



Contact Us

24 hours online service