Resistance wire liquid heater for heat management of new energy automobiles

Abstract

The invention discloses a resistance wire liquid heater for heat management of new energy automobiles. The inner portion of a heater shell is divided into a control chamber and a heat exchange chamber. A low-voltage inserting piece in the control chamber is connected with a driver assembly; a high-voltage inserting piece is connected with a first IGBT switch and a second IGBT switch, and the firstIGBT switch and the second IGBT switch are connected with the driver assembly. A high-voltage resistance wire heating pipe and a low-voltage resistance wire heating pipe are arranged in the heat exchange chamber, wherein the high-voltage resistance wire heating pipe and the low-voltage resistance wire heating pipe are connected with the driver assembly. Under a first working condition, a voltagesensor controls the working voltage to be transmitted to the high-voltage resistance wire heating pipe through the first IGBT switch and the driver assembly, and the high-voltage resistance wire heating pipe starts heating. Under a second working condition, the voltage sensor controls the working voltage to be transmitted to the low-voltage resistance wire heating pipe through the second IGBT switch and the driver assembly, and the low-voltage resistance wire heating pipe starts heating to meet the heating demand of the power battery at low voltage, and the high-voltage demand under normal full power condition so as to achieve the best intelligent utilization ratio.

Description

technical field [0001] The invention relates to the technical field of liquid heaters for new energy vehicles, in particular to a resistance wire liquid heater for thermal management of new energy vehicles. Background technique [0002] With the rapid development of electric vehicles in recent years, safety, efficiency, battery life, and intelligence are particularly important in the popularization of electric vehicles. Car companies have designed battery thermal management systems for power batteries, and air-conditioning thermal management systems for heating and defrosting. The liquid heater is an important part of the battery thermal management system and the air conditioner thermal management system. The current existing liquid heater technologies are as follows: [0003] A PTC electric heating tube and an electric vehicle water heating heater are characterized in that it includes a heating element, an electrode plate, a solid insulating layer, a spacer and a metal tube...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent is only a scheme form of the PTC heating tube body, but the key points for application in new energy vehicles are safety, efficiency, and intelligence, which require multiple safety protection designs to form intelligent information interaction with the vehicle. The temperature requirements of the actual vehicle and the battery information signal make the most efficient and safe heating output; therefore, this patent has no control method, no efficient assembly design, no safety protection measures, etc.; in addition, the PTC heating sheet and the There are certain disadvantages in the technology of sticking the electrode plate to the electrode plate. The reason is that the original wave-shaped electrode plate cannot guarantee high-precision flatness after being drawn and deformed, so that it cannot be in effective surface contact with the PTC heating sheet, and the electrode will expand after thermal expansion and contraction after aging. It is prone to the problem of small ignition and arcing on the contact surface, which will cause heavy losses to the car

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