Cooling liquid flow direction controllable battery pack, battery pack thermal management system and control method

Abstract

The invention discloses a cooling liquid flow direction controllable battery pack, a battery pack thermal management system and a control method. The battery pack comprises a battery pack shell and aliquid cooling plate arranged in the battery pack shell, and the battery pack shell is provided with a battery pack water inlet and a battery pack water outlet; and the liquid cooling plate comprisesa first liquid cooling plate pipe connector and a second liquid cooling plate pipe connector which are located on the left side and the right side of the liquid cooling plate, and a cooling liquid flow channel is formed between the first liquid cooling plate pipe connector and the second liquid cooling plate pipe connector. A steering device which is connected with the first liquid cooling plate pipe connector and the second liquid cooling plate pipe connector through pipelines and can change a flowing direction of a cooling liquid in the cooling liquid flow channel is further arranged in thebattery pack shell; and the steering device comprises a device water inlet connected with the battery pack water inlet through the pipeline and a device water outlet connected with the battery pack water outlet through the pipeline. According to the invention, long-standing temperature distribution fixity is eliminated, a heat dissipation difference of battery pack monomers is reduced, a service life of the power battery is prolonged, and the performance of the power battery is improved.

Description

technical field [0001] The invention relates to the technical field of battery structure of new energy vehicles, and specifically refers to a controllable cooling liquid flow to a battery pack, a battery pack heat management system and a control method. Background technique [0002] Due to its compliance with the development trend and concept of energy saving, emission reduction and environmental protection, electric vehicles have become the focus of the development of various automobile companies in the world. As one of the key components of electric vehicles, the power battery's performance and life are greatly affected by temperature. At high temperature, on the one hand, the activity of the electrolyte is improved with the increase of temperature, and the internal resistance of the battery is reduced, which improves the performance of the battery to a certain extent; Batteries cause permanent damage and reduce battery life. The low temperature is opposite to the high t...

AI Technical Summary

Problems solved by technology

However, the current liquid thermal management system generally has a relatively long flow channel, resulting in a relatively large temperature difference between the battery inlet and outlet, so that some cells in the battery pack are always in a high or low temperature environment. There is a large difference in heat dissipation, which affects the consistency of the monomer, which in turn affects the life of the power battery

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