Control method suitable for preheating of power battery of direct-current quick-charging pile

Abstract

The invention provides a control method suitable for preheating of a power battery of a direct-current fast charging pile. The method comprises the steps: whether charging handshake identification work of the direct-current quick charging pile and the electric vehicle is completed or not is determined; if the handshaking work is completed, the electric vehicle sends a message that the vehicle is not ready to the direct-current quick charging pile, and whether the power battery needs to be heated or not is determined; if soothe heating is required, the power battery adds battery pure heating preparation to a message that a vehicle is ready sent to the direct-current fast charging pile, and the direct-current fast charging pile heats the power battery, after heating is completed, the electric vehicle sends a message that the vehicle is ready to the direct-current fast charging pile; in addition, under the condition that it is determined that heating is unnecessary, the electric vehicle sends a message that the vehicle is ready to the direct-current fast charging pile; and the direct-current quick charging pile charges the power battery after receiving a message that the electric vehicle is ready from the electric vehicle. According to the invention, the battery pure heating function can be realized in the direct-current quick charging pile, and the front-back compatibility and inheritance are better.

Description

technical field [0001] The invention relates to a control method for preheating of a power battery, which can realize the preheating of the power battery at low temperature by a DC fast charging pile. Background technique [0002] With the shortage of resources in the world and the increasing environmental pollution, my country is vigorously developing new energy vehicles represented by electric vehicles. As we all know, the power battery installed on electric vehicles is greatly affected by the ambient temperature. When the temperature is low, such as minus 10 degrees Celsius or lower, the charging pile cannot directly charge the power battery. [0003] Charging piles mainly include AC slow charging piles and DC fast charging piles. In view of the situation that the temperature of the power battery is too low to be directly charged, the current products on the market use AC slow charging piles to heat or keep the power battery warm. Some manufacturers It can also realize t...

AI Technical Summary

Problems solved by technology

[0004] However, the main reason why the power battery cannot be purely heated is that fast charging in China follows the GB / T27930 protocol. When the protocol specification was formulated, the working conditions of the power battery during pure heating were not considered. The monitoring mechanism in the protocol specification makes DC fast charging impossible. Realize the working mode of pure heating

In real life, not all charging stations are equipped with AC and DC charging piles in the configuration of charging stations. Let me give an example in real life: in the cold winter, when the car owner needs to supplement the power battery of the vehicle, due to the temperature is too high If you need to preheat the power battery first, if there are only DC fast charging piles around, and the DC fast charging pile does not support the pure battery warm-up function, then conflicts will arise, and the car owner will be at a loss, and the car experience will be unfriendly

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