Method for acquiring internal temperatures of single batteries in battery packs

Abstract

The invention discloses a method for acquiring the internal temperatures of single batteries in battery packs. The method includes steps of (1), reading the temperatures of environments where the battery packs are located, the temperatures of the surfaces of the single batteries, the temperatures of air inlets of the battery packs and the temperatures of air outlets of the temperature packs; (2), adding the quantity of heat generated by the single batteries, the heat conduction quantity of heat transmitted from the environments to the surfaces of the single batteries, the heat conduction quantity of heat transmitted from the air inlets of the battery packs to the surfaces of the single batteries and the heat conduction quantity of heat transmitted from the air outlets of the battery packs to the surfaces of the single batteries with one another to obtain the total quantity of heat generated by the single batteries; (3), acquiring the internal temperatures of the single batteries by means of computation according to a shown formula. The method has the advantage that internal actual working environments of the single batteries can be effectively judged by the aid of the method.

Description

Technical field [0001] The invention relates to a method for obtaining the internal temperature of a battery cell in an energy storage battery pack, and in particular to a method for obtaining the internal temperature of a battery cell by a battery management system in a power battery pack for electric vehicles. Background technique [0002] The number of batteries required for energy storage is huge, and battery management is extremely important. Because the properties of the battery itself are more sensitive to temperature, if you need to obtain the exact battery characteristics, you need to get the exact temperature of the battery cell, but in reality, the cost of measuring the internal temperature of the battery cell is high, and it cannot be applied to actual products in batches. in. At present, most BMSs do not estimate the internal temperature, but manage the battery data based on the temperature of the measured cell surface, and the accurate curve characteristics of the ...

AI Technical Summary

Problems solved by technology

Since the properties of the battery itself are sensitive to temperature, if you need to obtain the exact battery characteristics, you need to get the exact temperature of the battery cell. However, in reality, the cost of measuring the internal temperature of the battery cell is high, and it cannot be applied to actual products in batches. middle

At present, most BMSs do not estimate the internal temperature. They only manage the battery data based on the temperature measured on the surface of the cell, and cannot obtain the precise curve characteristics of the battery.

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