Electric automobile cold start system based on eddy current heating

Abstract

The invention belongs to the technical field of electric vehicle application, and provides an electric vehicle cold start system based on eddy current heating. A high-frequency alternating current is introduced into eddy current coils arranged at the upper position and the lower position of the square battery, an eddy current is generated on a metal pole plate of the square battery through the electromagnetic induction effect, and the square battery is evenly heated through the heat effect of the eddy current. Temperature sensors are distributed on the surfaces of the square batteries, temperature signals of the surfaces of the batteries are transmitted to a single chip microcomputer, and the single chip microcomputer controls an inverter so as to control the heating process. Compared with a traditional electric automobile cold start system, the electric automobile cold start system has the advantages that the square batteries are heated in a spaced mode through the electromagnetic induction effect, the uniformity of the temperature of the single batteries is guaranteed, and the influence of heat conduction on other parts in an automobile body is reduced. Compared with a traditional heating mode, the efficiency of eddy current heating is as high as 95%. The eddy current heating speed is high and the response time is short. The system can directly utilize a direct-current power supply provided by a square battery, and the direct-current power supply is converted into a high-frequency alternating-current power supply through an inverter.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle application, and in particular relates to an electric vehicle cold start system based on eddy current heating. Background technique [0002] With the rapid development of the field of electric vehicles, the current technology of electric vehicles is becoming more and more mature, and it is necessary to gradually replace vehicles that rely on traditional energy sources. Therefore, electric vehicles need to operate normally in more extreme application scenarios. When a cold start is performed at an ambient temperature, the viscosity of the electrolyte will increase due to the low temperature, the ion activity will decrease, and the internal resistance will increase, which will lead to a sharp drop in the cruising range of the electric vehicle, which will easily lead to excessive discharge of the battery, and then cause irreversibility of the power battery. damage. Therefore, it is very imp...

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Problems solved by technology

[0006] However, there are some deficiencies in the traditional electric vehicle cold start system. Electric heating can only heat the battery through heat conduction, which causes uneven internal temperature of the battery, resulting in thermal stress inside the battery.

Heat pump heating heats the battery pack by heating the air. The heat pump system is too large, which is not conducive to the simplification of the structure and weight reduction of electric vehicles.

AC charging and discharging preheating uses alternating current to charge and discharge the battery. This heating method requires complex electronic control equipment. Due to the differences between batteries, the system design is more complicated and the reliability is lower.

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