Lithium-ion battery pack heat dissipation system

Abstract

The invention discloses a lithium-ion battery pack heat dissipation system which comprises a battery box, a battery pack, side sealing plates for forming sides of the battery box and end face plates for forming the upper end face and the lower end face of the battery box. A hollow heat exchange plate is arranged in the battery box and divides the battery box into a plurality of battery accommodating chambers, each heat exchange plate in the battery box is connected to be a whole to form a heat exchange device, hollow parts between the heat exchange plates are filled with condensation mediums and are communicated with each other, the heat exchange device is connected with an external compressor and a condensation medium storage tank, and a condensation circulation loop is formed. By adoption of the heat exchange plate and the condensation mediums, heat generated by the battery pack in the battery box can be dissipated quickly, so a battery cell in the battery pack can maintain a stable working temperature, and comprehensive properties of the battery are ensured. The heat dissipation system is simple in structure and principle and can work stably for a long time, and maintenance costs at a later period are reduced.

Description

technical field [0001] The invention relates to the field of electric vehicle batteries, in particular to a cooling system for lithium-ion battery packs. Background technique [0002] The heat dissipation system of electric vehicles affects the energy consumption of electric vehicles and the service life of equipment, among which the battery of electric vehicles has the greatest impact. The batteries currently used in electric vehicles include lead-acid batteries, lithium-ion batteries, sodium-sulfur batteries and nickel-cadmium batteries. Among them, because lithium-ion batteries have the characteristics of light weight, large energy storage, high power, and no pollution, they will gradually replace existing batteries. Widely used lead-acid batteries. However, since lithium-ion batteries are greatly affected by temperature, excessively high temperatures will easily decompose the battery electrolyte, causing premature aging of the battery, and at the same time, it will caus...

AI Technical Summary

Problems solved by technology

[0003] According to literature, when the cell temperature of a lithium-ion battery pack reaches 45°C or higher, the cell will be in a rapid discharge state, while the cell that has not reached this temperature is still in a normal discharge state. After many times, the cell will be in a rapid discharge state. The service life and performance of the core will be greatly reduced, and the performance of the battery pack will not meet the initial design requirements and goals

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