Electric vehicle battery box refrigeration device and temperature control method using it

Abstract

The embodiment of the invention discloses an electric vehicle battery box refrigeration device, and relates to the technical field of electric vehicles. The device is invented on the premise of satisfying the sealing performance of the battery box in order to simply and conveniently control the temperature in the battery box. The electric vehicle battery box refrigeration device comprises a power supply control system, a semiconductor refrigeration sheet connected with one end of the power supply control system, and an external heat dissipation system and an internal heat dissipation system which are connected with the other end of the power supply control system; when the temperature in the battery box is higher than a first preset value, the power supply control system controls the semiconductor refrigeration sheet to refrigerate, and the battery box is cooled through the external heat dissipation system and the internal heat dissipation system; and when the temperature in the battery box is higher than a second preset value, the power supply control system controls the semiconductor refrigeration sheet to heat, and the battery box is heated through the external heat dissipation system and the internal heat dissipation system.

Description

technical field [0001] The invention relates to electric vehicle technology, in particular to a refrigeration device for a battery box of an electric vehicle and a temperature control method using the device. Background technique [0002] At present, the vast majority of electric vehicles use lithium-ion batteries as electrical energy storage systems, and the optimal operating temperature of lithium-ion batteries is 18°C-35°C. In order to prolong the service life of the lithium-ion battery and the cruising range of the electric vehicle as much as possible, it is necessary to control the temperature in the battery box of the electric vehicle. [0003] In the prior art, the following technologies are usually used to control the temperature in the battery box of the electric vehicle: the first is to control the temperature in the battery box of the electric vehicle through air-cooling technology; the second is to use Liquid cooling technology controls the temperature inside th...

AI Technical Summary

Problems solved by technology

[0004] However, the first technology can generally only take away the heat in the battery box, but cannot actively reduce the temperature in the battery box, let alone heat up the battery box.

Moreover, in this technology, the battery box is open and cannot be waterproofed, so it cannot meet the wading test requirements of electric vehicles

In the second technology, although the cooling and heating of the battery box can be realized, the refrigeration system of the electric vehicle is complicated when this technology is adopted, and the process requirements are high; at the same time, since the entire refrigeration system needs to use a large amount of liquid (such as water, oil and other liquids with high specific heat), which increases the weight of electric vehicles and reduces the battery life of electric vehicles

Images