Method for measuring heating power of power battery

Abstract

The invention relates to a method for measuring heating power of a power battery. Through the reverse application of an electric current calorimeter method, the heating power measurement of a lithium battery group in series and parallel connection welding is carried out under different SOC, through curve fitting, a corresponding fitting curve function is obtained, through directly measuring the heating power of the battery group in an actual working state, a data support is provided for further analysis simulation, and the heating power measurement of charging and discharging of a power battery group in a welding state can be carried out. The method is simple and reliable, the operation is easy, and direct test data is provided for the thermal management of power batteries.

Description

technical field [0001] The invention relates to the field of reverse application of the current calorimeter method, in particular to a method for measuring heating power of a power battery. Background technique [0002] Due to the complex internal structure of the power battery, there are many factors that affect the heating power, and the measurement of the heating power is very difficult. Most of the related research work is based on the thermal effect model of BERNARDI or the optimization of the model, but the thermal effect model of BERNARDI has no effect on the single battery. Thermal analysis is very effective, but since the battery pack is composed of many single cells connected in series and parallel by wire welding, there will be Joule heat at the welding place. For automotive power batteries, there will be tens of thousands of welding points, and the heat generation will not be ignored. . At the same time, the thermal accumulation effect of the battery pack will c...

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Problems solved by technology

[0002] Due to the complex internal structure of the power battery, there are many factors that affect the heating power, and the measurement of the heating power is very difficult. Most of the related research work is based on the thermal effect model of BERNARDI or the optimization of the model, but the thermal effect model of BERNARDI has no effect on the single battery. Thermal analysis is very effective, but since the battery pack is composed of many single cells connected in series and parallel by wire welding, there will be Joule heat at the welding place. For automotive power batteries, there will be tens of thousands of welding points, and the heat generation will not be ignored.

At the same time, the thermal accumulation effect of the battery pack will make the temperature of the battery at the center too high, which will affect the internal resistance of the battery and change the heating power of the battery. Therefore, the thermal effect model of BERNARDI has limitations.

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