Low-temperature rapid heating method and system for power battery pack for electric vehicle

Abstract

The invention discloses low-temperature rapid heating method and system for a power battery pack for an electric vehicle. The low-temperature rapid heating system comprises a battery management system and a heating controlling system, wherein the battery management system is used for managing energy and heat of the power battery pack and carrying out short circuit protection; the heating controlling system consists of a controller, two IGBT transistors, an inductor and two diodes; the controller controls the two IGBT transistors by applying a pulse width modulated signal to realize a transient short circuit and drives the two IGBT transistors to be simultaneously connected or disconnected so as to control a current in a loop; by virtue of a pulse width modulation mode, the connection and disconnection states of the first and second IGBT transistors are continuously regulated, so that a current in the inductor fluctuates by being lower than a fixed value limited by bus insurance. According to the low-temperature rapid heating method and system disclosed by the invention, the current repeatedly passes through an internal resistor of the battery to generate heat for heating the power battery pack, and the battery pack is rapidly heated. The low-temperature rapid heating method and system have the advantages that large heating current and the controllability of the system are both ensured; the battery heating efficiency is improved by adopting a method of the transient short circuit.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics, and relates to a low-temperature rapid heating method and system for a power battery pack of an electric vehicle; it is especially suitable for heating the battery pack of a pure electric passenger car. Background technique [0002] With the development of new energy vehicles, lithium battery power battery packs are used more and more widely, and the battery pack will inevitably encounter low temperature environments during use. At low temperatures, there are still major problems with the charging and discharging performance of lithium batteries, which has a greater impact on the use of new energy vehicles. Therefore, the heating function of the battery pack is particularly important in low temperature environments. [0003] Most of the existing lithium battery heating systems install a heating film or heater on the lithium battery, start the heating device at low temperature, fir...

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Problems solved by technology

[0004] The invention discloses a low-temperature rapid heating method and system for electric vehicle power battery packs, in order to solve the problem of slow heating speed, long heating time, low efficiency and difficulty in ensuring the uniformity of heat in the prior art, which may cause temperature problems among battery modules. Issues such as increasing the difference

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