Battery module thermal runaway expansion suppression device based on heat tube

Abstract

The invention provides a battery module thermal runaway expansion suppression device based on a heat tube, and belongs to the technical field of the electromobile power battery management. The batterymodule thermal runaway expansion suppression device based on the heat tube comprises a battery module, a runner, a base and aluminium plate jackets. The battery module comprises multiple same batteryand heat tube module units. Each battery and heat tube module unit comprises two single batteries, two thermal insulating jackets, two heat-conducting aluminum plates, a heat tube group and a thermalinsulating bar. Two single batteries are fixed at the inner side of the thermal insulating jackets. Two heat-conducting aluminum plates are positioned between two single batteries. Two heat-conducting aluminum plates are fixed with the evaporation section of each heat tube in the heat tube group through the thermal insulating bar. The condensation section of the lower part of the heat tube is positioned in the runner and used for performing the heat convection. The battery module is integrally fixed with the front and rear aluminium plate jackets through the base. The device is capable of effectively controlling the temperature of the battery module and the surface temperature difference of the battery, suppressing the thermal runaway expansion in the battery module, improving the safetyof a electromobile battery system, and providing the guidance for the safety design of the battery module.

Description

technical field [0001] The invention belongs to the field of electric vehicle power battery management, in particular to a heat pipe-based thermal runaway expansion suppression device for battery modules. Background technique [0002] As a clean and environment-friendly new type of transportation, electric vehicles are attracting more and more attention. As a power battery with high specific energy, high cycle life and low self-discharge rate, lithium-ion power battery (hereinafter referred to as "power battery") has been widely used in electric vehicles. The safety of power batteries is the primary problem to be solved for the large-scale development and application of electric vehicles. When the power battery is mechanically abused, electrically abused, or thermally abused, it may trigger thermal runaway of the power battery. For a power battery system, a battery pack contains several battery modules, and a battery module contains several single cells connected in series...

AI Technical Summary

Problems solved by technology

[0003] At present, the battery module structure in most electric vehicles is the direct contact between the single cells or adding heat-conducting aluminum sheets between the single cells for heat dissipation, such as the battery module structure of SAIC EV / HEV, this kind of battery Although the design structure of the module improves the grouping efficiency of the battery module, it has limited heat conduction effect on large-capacity lithium-ion batteries, and cannot suppress the expansion of thermal runaway in the battery module when thermal runaway occurs

At present, there are few patents used to suppress the expansion of thermal runaway of battery modules. Patent 201410232534.7 uses the method of modeling and simulation to propose a method of adding a heat insulation layer between battery cells to suppress the expansion of thermal runaway, and conducts experiments. The feasibility of this method has been verified

Since the temperature of the power battery has a great influence on the performance of the battery, too low or too high temperature will lead to attenuation of battery capacity, reduced lifespan, and weakened consistency of battery modules, etc. Adding a heat insulation layer can only be used to inhibit the expansion of thermal runaway It cannot play the role of battery thermal management

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