Quick charge type lithium ion battery module structure

Abstract

The invention discloses a quick-charge type lithium ion battery module structure which comprises a battery box and a cooling plate, the cooling plate is arranged in the battery box, a cooling liquid channel for cooling liquid to circulate is arranged in the cooling plate, a battery jack is formed in the cooling plate, a lithium ion battery is inserted in the battery jack, and the lithium ion battery is arranged in the cooling liquid channel. A ventilation opening communicated with the interior of the battery box is formed in the wall body of the battery box. By arranging the cooling plate and the ventilation opening, two cooling modes of air cooling and water cooling are perfectly combined, on one hand, the contact area of the lithium ion battery and the cooling plate can be increased, the heat dissipation uniformity of the lithium ion battery in the module is improved, on the other hand, the contact area of the lithium ion battery and air can be increased, and the heat dissipation efficiency is improved. The natural heat exchange coefficient of the surface of the lithium ion battery is improved, the heat dissipation capacity of the surface of the battery is improved, the heat dissipation capacity of the battery module can be improved to the maximum extent while the strength of the battery module is guaranteed, the battery performance is guaranteed, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of batteries, and more specifically relates to a fast-charging lithium-ion battery module structure. Background technique [0002] In recent years, in order to reduce carbon emissions and dependence on oil, the country has begun to vigorously promote new energy vehicles, and at the same time, promote the popularization of "oil-to-electricity" in the field of construction machinery. As the core component of new energy vehicles and engineering applications, lithium-ion batteries still have the problems of low capacity and short charging time. Due to the characteristics of the material itself, high-capacity lithium-ion batteries have extremely high potential safety hazards. On the contrary, ultra-fast charging lithium-ion batteries have increasingly become the research and development center of many companies. Among them, the current ultra-fast charging lithium battery market is mainly concentrated in other e...

AI Technical Summary

Problems solved by technology

When the ultra-fast charging lithium battery is charged and discharged at a high rate, a large amount of heat will be generated. If the heat generated by the battery cannot be dissipated in time, the temperature of the single cell may rise.

Excessive temperature will affect other performances such as battery life and capacity, and even cause the risk of thermal runaway

[0003] At present, there are two main ways to dissipate the heat of the module. The first is liquid cooling, which takes away the heat generated by the battery inside the module through the coolant in the communication pipe, but the design of the communication pipe is generally at the upper or lower end of the module or the module Although the two sides of the battery can ensure full contact with the module space, for the battery inside the module, the heat in the internal gap of the series-parallel battery cannot be dissipated in time, and the heat accumulation may damage the performance of the battery, resulting in insufficient effective heat dissipation area for liquid cooling. Moreover, the volume of the liquid cooling pipe inside the module is too large, which leads to the problem of low space utilization of the module. If there are too many connecting pipes, the strength of the module will be insufficient and mechanical damage will occur.

The second is air cooling, usually there are air inlets and outlets on the end plate of the module, through natural air cooling or forced air cooling, natural air cooling can meet the requirements of low-power modules, but when there is too much heat, The heat may not be dissipated in time; forced air cooling requires a cooling fan on the air inlet side of the module, but the existence of the fan leads to insufficient strength when the battery modules are used in series and parallel, which may cause mechanical damage

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