A liquid cooling module for lithium ion power battery

Abstract

The invention provides a liquid-cooled module of a lithium-ion power battery. The battery module is assembled from a plurality of battery modules, and the upper surface and the lower surface of the battery module are provided with slots for placing liquid-cooled flat tubes; The slot is parallel to the length direction of the battery module; the lithium-ion power battery liquid cooling module includes liquid-cooling flat tubes arranged back and forth, and the liquid-cooling flat tubes extend along the length direction of the battery module. The parts are bent, and the liquid-cooled flat tubes are passed between adjacent battery modules. The integrated liquid cooling pipeline design of the battery module can realize rapid heat dissipation and heating of the module under the premise of maintaining the temperature uniformity of the module, and has excellent thermal management performance; parameter adjustment and matching design can be carried out according to thermal management requirements , has strong temperature adaptability, and can effectively improve the weight specific energy density and volume specific energy density of the battery module; the modular design is adopted, and the assembly is convenient, fast and efficient.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a module structure of a power battery. Background technique [0002] At present, lithium-ion power batteries include cylindrical batteries, square batteries, soft pack batteries, etc. Compared with other batteries, soft-pack batteries have the advantages of good safety, light weight, large capacity, small internal resistance, and flexible design. Soft-pack lithium-ion power battery modules are getting more and more attention and popularization in the application of pure electric vehicles and hybrid vehicles. Whether the battery module design and the overall battery pack design are scientific and reasonable play a crucial role in all aspects of the performance indicators of the battery system. effect. At present, the group design method of soft-pack batteries is as follows: ① first integrate several pieces of soft-pack batteries in parallel, and package them in an aluminum a...

AI Technical Summary

Problems solved by technology

[0004] (1) Battery heat dissipation: The single battery module is designed with an aluminum alloy shell, trying to quickly take away the heat of the battery cells through the natural heat dissipation of the metal shell, but after stacking multiple batteries to form a module, the internal heat accumulates, and the natural heat dissipation effect is slow. The temperature rises significantly, and there will be a large temperature difference between the inside of the module and the edge cells, which will affect the consistency of the battery, and even greatly reduce the overall consistency and life of the battery pack;

[0005] (2) Module heating and heat dissipation: This design generally heats and dissipates heat by adding a heating plate or a liquid cooling plate to the bottom or side of the battery module, but the pouch battery generally has a large length and width, and the heating and cooling section of the battery cell The surface and the center of the battery core are relatively large, and the heat transfer is slow, which may easily cause the internal temperature of the module to rise and decrease slowly, resulting in a large temperature difference between the inside and outside of the module;

[0006] (3) Connection and fixation: The connection and fixation of the module is fixed by passing long bolts through the four corners of the single battery module. This fixing method needs to extend the reserved bolt vacancy distance in the length direction of the single battery, resulting in an increase in the volume of the battery module. Large, the volume specific energy density decreases;

[0007] (4) Parallel connection of single battery modules and busbars in series between modules: the design of the overcurrent capacity of the busbars is not fully considered, and the temperature of the busbars will be higher than the temperature of the battery cells under the condition of meeting the basic needs of electrical conduction, which will increase the temperature of the battery cells. rise, while causing unnecessary power loss as a whole;

[0008] (5) Gap between battery modules: In order to increase natural heat dissipation and increase the heat exchange surface area, a certain gap (more than 2mm) is generally reserved between modules. The existence of the gap will inevitably lead to a decrease in the volumetric energy density of the battery module , resulting in low space utilization, resulting in a decrease in overall energy and affecting overall electrical performance indicators

[0009] (6) Environmental adaptability: poor adaptability to severe cold and hot summer areas, forcible use will cause irreversible damage to battery life

[0010] (7) Module fixing and weight reduction: For the long bolt fixing method, when the span is large, the middle position is easy to shake, and the vibration performance needs to be improved

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