Cylindrical power battery pack heat dissipation optimization method based on electrode welding optimization

Abstract

The invention discloses a cylindrical power battery pack heat dissipation optimization method based on electrode welding optimization. The method comprises the steps that battery welding power and welding time are determined; calculating the number limit of welding spots; building a cylindrical battery thermodynamic model according to the size of the cylindrical battery and the rated working current to calculate the total heat production and heat distribution of a battery plate; calculating the welding point number per unit area of the pole plate according to the pole plate heat production; and finally optimizing the welding spot layout according to the pole plate heat distribution to realize the heat transfer efficiency of the battery pole plate. The heat dissipation efficiency of the power battery pack can be effectively optimized under the conditions that the structural design of the power battery pack is not changed and the cost is not greatly increased. And the heat dissipation efficiency is improved, and meanwhile, the energy consumption is prevented from being increased and the reliability is prevented from being reduced. The conductive bands are linked to the surrounding cylindrical batteries, so that the cylindrical battery pack has better soaking performance, the problem of heat accumulation in a large battery pack is prevented, the service life of the batteries is greatly prolonged, and potential safety hazards are reduced.

Description

technical field [0001] The present application relates to the technical field of battery heat dissipation, in particular to a heat dissipation optimization method for cylindrical power battery packs based on electrode welding optimization. Background technique [0002] Cylindrical lithium-ion batteries have been widely used in high-power applications such as electric vehicle power batteries because of their advantages such as tension in all directions can cancel each other, not easy to expand and deform, good consistency, and gas is not easy to leak, good pressure resistance, etc. application. However, the heating problem of high-power batteries also brings very serious challenges. [0003] A large battery pack is usually composed of multiple single cells connected in parallel or in series. This structure potentially increases the contact resistance of the battery, and the heat generated by the contact resistance is one of the important heat sources for the battery. Theref...

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Problems solved by technology

[0006] The large-area welding method not only consumes a lot of energy, but also easily causes damage to the battery plates in large-area laser welding, which is not conducive to the stable operation of the battery.

Although the heat-conducting silica gel sheet can realize the heat dissipation of the battery bipolar plate to a certain extent, the heat-dissipating efficiency of the heat-conducting silica gel sheet is low and cannot meet the heat dissipation requirements of the battery

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