Charging and discharging battery self-heating device and automobile

Abstract

The invention provides a charging and discharging battery self-heating device. The charging and discharging battery self-heating device comprises a charging and discharging battery, an IGBT module, amotor and a motor driving controller. The IGBT module comprises three IGBT bridge arms which are connected in parallel, each IGBT bridge arm comprises two IGBT sub-modules which are connected in series, and each IGBT sub-module comprises an IGBT and a diode which is reversely connected in parallel; the three-phase alternating-current output end of the motor is respectively connected between the two IGBT sub-modules in each bridge arm; the motor driving controller is connected with the grid electrode of each IGBT; the motor outputs three-phase alternating current in a preset current period loading mode, and when the corresponding IGBT is conducted, high-frequency charging and discharging current is generated to realize self-heating of the charging and discharging battery, and the IGBTs in the same IGBT bridge arm are enabled to alternatively participate in diversion work. The preset current period loading mode is that current is loaded in 0-1 / 4 and 1 / 2-3 / 4 periods in opposite directions, and no current is loaded in 1 / 4-1 / 2 and 3 / 4-4 / 4 periods. According to the invention, the self-heating of the charging and discharging battery is ensured, the current is reasonably distributed, the effective value of the IGBT participating in current guiding is reduced, and the power loss of the IGBT is reduced.

Description

technical field [0001] The invention relates to the field of battery technology and the field of automobile technology, in particular to a self-heating device for charging and discharging batteries and an automobile. Background technique [0002] The charging and discharging performance of rechargeable batteries (such as lithium-ion batteries) is greatly reduced in low temperature environments. In order to improve the low-temperature performance, it is necessary to heat the charging and discharging battery in a low-temperature environment. [0003] In the prior art, relevant research has been carried out on the heating treatment of charge-discharge batteries in a low-temperature environment. For example, a charging and discharging battery heating method is to control the motor inductance through the motor controller to repeatedly "energy storage - energy release", thereby generating high-frequency alternating current on the DC bus, and distributing the current through the I...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing charging and discharging battery heating method, because the IGBT module is composed of three bridge arms connected in parallel, a part of the IGBTs in each bridge arm in the IGBT module participates in the conduction work during the charging and discharging process, while the other part of the IGBTs However, it does not participate in the diversion work, which will cause the IGBT participating in the diversion to be in a heating state for a long time, and the IGBT that is not involved in the work does not have heat, resulting in loss of power of the IGBT

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