Motor control circuit, vehicle and battery self-heating control method

Abstract

The invention discloses a motor control circuit, a vehicle and a battery self-heating control method. The battery self-heating control method comprises the following steps: receiving a battery heating command, and controlling a battery to enter a first heating mode or a second heating mode according to a judgment signal; in the first heating mode, switching off a first switch module, switching off a third switch module, and switching on a second switch module, and alternately switching on the upper bridge arm and the lower bridge arm of a bidirectional inverter; and in the second heating mode, switching off the first switch module, switching on the second switch module, the third switch module, and alternately switching on the upper bridge arm and the lower bridge arm of the bidirectional inverter. The motor control circuit provided by the invention has two battery heating modes under the cooperative action of the bidirectional inverter and each switch module, and the battery self-heating control method can efficiently heat the battery according to the temperature of the battery and the use scene of the vehicle, thereby effectively reducing the development cost of the whole vehicle, simplifying the module and reducing the development difficulty.

Description

technical field [0001] The invention generally relates to the technical field of battery heating, and in particular to a motor control circuit, a vehicle and a battery self-heating control method. Background technique [0002] Due to many problems such as resources, energy and the environment, the development of new energy has been paid more and more attention, and batteries, especially lithium batteries, as new energy carriers have become a trend, and they are more used in electric vehicles. However, new energy vehicles are limited by the low-temperature low-temperature activity of lithium batteries. In order to protect the battery, the strategy of charging with low current at low temperature is generally chosen, which makes users feel bad and limits the use of new energy vehicles. [0003] The traditional way of heating the battery mostly uses water heating scheme, which is inefficient; while the existing battery self-heating methods include: one is to use the battery self...

AI Technical Summary

Problems solved by technology

However, new energy vehicles are limited by the characteristics of low-temperature low-temperature activity of lithium batteries. In order to protect the battery, the strategy of charging with low current at low temperature is generally selected, which causes users to feel bad and restricts the scope of use of new energy vehicles.

[0003] The traditional way of heating the battery mostly uses water heating scheme, which is inefficient; while the existing battery self-heating methods include: one is to use the battery self-heating module, which needs to add a controller, a large inductor, a large capacitor and a separate The discharge circuit is high in cost and the device utilization rate is not high; the other is that the battery charges and discharges the grid through a bidirectional inverter motor controller to achieve self-heating, and needs to be connected to an AC charging pile, and the usage scenarios are limited

Images