Temperature control device for electric vehicle and electric vehicle

Abstract

The invention relates to a temperature control device for an electric vehicle and the electric vehicle, and belongs to the technical field of batteries. The temperature control device comprises a battery mounted at an electric vehicle and constituting a power source thereof; an electricity connecting component used for connecting an external power supply outside the electric vehicle; and a plurality of heating parts connected in parallel, attached to the battery and electrically connected with the electricity connecting component, capable of heating the battery by supplying power to the heating parts when the electricity connecting component is connected with the external power supply. According to the invention, the battery is heated by the plurality of heating parts connected in parallel, so that high-power heating can be achieved, and the battery is rapidly heated to the optimal working condition; the heating parts connected in parallel have the characteristic of the small heating power difference, so that the temperature rise consistency of the battery is good and the temperature field of the battery is uniform; when the vehicle is in an ultralow temperature environment, the electricity connecting component is connected with the external power supply to heat the battery, so that the battery can also keep the normal operation in a low-temperature environment.

Description

technical field [0001] The invention belongs to the field of battery technology, and specifically relates to a temperature control device for electric vehicles and a vehicle with the temperature control device. The vehicle is understood to include electric vehicles, hybrid electric vehicles and other environmentally friendly vehicles, and can be specifically selected as electric vehicles, Electric trains and golf carts, etc. Background technique [0002] Lithium batteries have been widely used in electric vehicle batteries. However, changes in external temperature will directly affect the charging and discharging performance of lithium batteries. Especially in low temperature environments, the charging and discharging performance of lithium batteries will drop significantly, which will directly affect the use of lithium batteries. life. [0003] In order to solve the problem of charging and discharging of lithium batteries in low temperature environment, at present, the hea...

AI Technical Summary

Problems solved by technology

[0004] 1. The heating film is placed under the liquid cold plate of the lithium battery, the heating film heats the cooling liquid, and then the cooling liquid is circulated to realize battery heating; the cooling liquid has a large specific heat capacity, especially in the northern winter when the temperature is low When the temperature is lower than 0°C, a lot of electric energy and time need to be wasted for heating the coolant, which is not conducive to energy saving and consumption reduction of the whole vehicle, resulting in poor user experience

[0005] 2. In order to increase the heating area of ​​the heating system, multiple heating films are connected in series and directly attached to the surface of the battery module. Since the terminal voltage of the heating film is greatly affected by its internal resistance, the heating power of the heating film at different positions The temperature rise rate of the battery cells in different positions is different, which can easily lead to thermal runaway of the battery cells

[0007] However, the above-mentioned heating system generally has the problems of low heating power and slow battery temperature rise, and the heating film is attached to the outside of the battery to heat the cooling liquid first, and then heat the battery cells through the circulation of the cooling liquid, which is not conducive to energy saving and consumption reduction of the whole vehicle.

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