Immersed battery pack and electric vehicle

Abstract

The invention relates to an immersed battery pack, which comprises a box body, the battery management system is in control connection with the battery cell and is used for managing charging and discharging of the battery cell; the module shell is used for loading immersion liquid, the battery cell is immersed into the immersion liquid, and heat or cold exchange between the battery cell and the immersion liquid is realized; and the circulating pipeline main body comprises a liquid return pipe and a liquid inlet pipe which are connected with the module shell, and an auxiliary assembly used for achieving circulating flowing of the immersion liquid is arranged on the liquid return pipe and / or the liquid inlet pipe. The invention further provides the electric vehicle. The battery cell is placed in the immersion liquid, and heat or cold is conveyed to the battery cell in a liquid cooling manner, so that the temperature control of the battery cell is realized. The battery pack is simple in overall structural design, reasonable in system composition, reliable in operation, capable of achieving rapid temperature control of the battery cells, stable in temperature control effect and capable of solving the thermal management problem existing in a traditional battery pack in the prior art.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and more particularly relates to an immersed battery pack and an electric vehicle. Background technique [0002] Chemical secondary batteries, especially battery packs composed of lithium-ion batteries, have a direct impact on battery performance and life due to poor thermal management. The battery pack will generate a certain amount of heat during the charging and discharging process, and as the charging and discharging current increases, the heat generation will show an increasing trend. Taking measures to limit the charging and discharging current limits the performance of the battery pack. At the same time, due to the uneven internal temperature caused by poor thermal management in the battery pack, as the number of charge and discharge cycles increases, the internal resistance of the battery cells is inconsistent and the pressure difference increases, resulting in a decrease in ...

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