Electric trolley battery heating method

Abstract

The invention relates to an electric trolley battery heating method. The heating method comprises the following steps: a temperature sensor on each battery unit of a battery group obtains the temperature of each battery unit; when minimum temperature of each battery unit is less than a first presupposition value, a battery control unit controls a heater to heat the battery group; when the temperature difference between any two battery units is greater than a second presupposition value, the battery control unit controls the operation of a fan, and the temperature in the battery group tends to be uniform; and when the minimum temperature of each battery unit is greater than the fourth presupposition value, the battery control unit controls the heater to stop operating, and the fourth presupposition value is greater than the first presupposition value. The electric trolley battery heating method provided by the invention guarantees that the minimum temperature of the battery group is not lower than the first presupposition value and simultaneously the maximum temperature of the battery group is not beyond the dangerous line, ensures the reliability of each battery and simultaneously enables the temperature of the battery group to maintain in a proper temperature range, and the battery group is fully charged.

Description

technical field [0001] The invention relates to a battery system of an electric vehicle, in particular to a heating method for an electric vehicle battery. Background technique [0002] With the development and application of new energy sources, the development of dual-source trolleybuses using lithium batteries as auxiliary drive power is becoming more and more mature. When the dual-source trolleybus is driving, most of the time it uses the DC power grid erected in the city as the driving power source. However, in some places where the power grid is not erected due to various reasons, the power battery pack carried by the tram must be used to provide power. Considering the cost and the difference between trams and pure electric vehicles, trams generally do not carry high-power battery packs. Therefore, in order to ensure that trams can run normally on ungrid sections, it is necessary to ensure that the energy of the battery packs is used during the grid-connected journey. ...

AI Technical Summary

Problems solved by technology

The heater is controlled by the micro-control MCU unit. At present, the MCU generally only controls the temperature point at which the heater is turned on and off, and the temperature point is determined by the minimum temperature in the battery unit, without considering the influence of the temperature difference between the battery units.

However, at present, most of the dual-source trolleybuses use lithium-ion batteries. If the heater continues to work when the temperature difference between the battery units is large, the battery unit with the highest temperature may cause internal damage to the battery due to high temperature.

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