TI中文支持网Part Number:BQ27426Other Parts Discussed in Thread: GPCRB
TI的工程师，您好！
我司项目，在使用BQ27426时，在对热性能参数配置时，有点疑问！
1、Thermal Rise Factor和Thermal Time Constant，这两个参数之间是什么关系？是否有理论公式？
2、使用默认值，在低温和高温条件下，误差会有多大？若在低温或高温条件，偏差较大，需要修改这两个参数时，除了通过标定的方式外，还有什么更好的方法？
thanks!
Star Xu：
您好
T Rise and T Time constant compensate for temperature change due to self heating of the cell during use. They can be calculated using the GPCRB tool.
T Rise gives the thermal rise factor that is used in the single time constant heating-cooling thermal modeling. If set to 0, this feature is disabled and simulations in the IT algorithm will not account for self-heating of the battery cell. Larger values of T Rise lead to higher temperature rise estimates for the IT simulation.
T Time Constant is the thermal time constant that is used in single time constant heating-cooling thermal modeling. The default setting can be used, or it can be modified to improve low-temperature accuracy if testing shows the model does not match the actual performance. T Time Constant defaults to 1000. This is sufficient for many applications. However, it can be modified if better predictive accuracy at low temperatures
The default values were chosen by TI when the part was developed. The intention was to have a baseline configuration that works for a large number of applications so that it's not necessary to study and set each of the very many parameters. Check the quick start guide for the minimum amount of parameters that must be configured https://www.ti.com/lit/pdf/sluubn3
About the non-default values in your file: OpConfig controls features like sleep and temperature sensor source. See TRM https://www.ti.com/lit/ug/sluubb0/sluubb0.pdf , 7.4.1.4.1 Operation Configuration (OpConfig) Register for details.
The current threshold setting are explained in 7.4.2.2 Current Thresholds Subclass. They control the state of the gauge, which should align with the state of the cell (charge, discharge, relax).
Design Capacity, Design Energy, Terminate Voltage and Taper Rate are described in the Quick Start guide. They are the basic parameters that must be adjusted for a specific cell and appliation.
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xianzhen cao：
OK，thanks!
