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Lithium-ion batteries are currently in the field of new energy vehicles, smart grid and other large-scale application in the field increased year by year, but the current battery parameters inconsistency is the key factor in the life of the battery pack, although the heat management level to a certain extent To ensure the safe operation of the battery pack, but to enhance the level of battery consistency is still a large-scale use of lithium batteries an important technical factors.

By simulating a 10-string 10 and battery pack, we illustrate the effect of the temperature distribution within the battery pack on its performance and cycle life. The lower the average temperature, the higher the degree of temperature unevenness, the higher the inconsistency of the depth of the single cell in the battery pack; the higher the average temperature, the higher the degree of temperature non-uniformity, the shorter the cycle life of the battery. It is worth noting that the uneven temperature distribution will lead to uneven distribution of current between the parallel branches, thus deteriorating the uniformity of the cell aging rate.

In the thermal management of the battery pack, we propose a method to quickly estimate the flow field and temperature field inside the parallel air-cooled battery pack. The method consists of a flow resistance network model and a transient heat transfer model, which avoids the problem that the computational fluid dynamics method is used to simulate the large amount of battery pack, while ensuring a high estimation accuracy. Using this method, we investigated the effect of inhomogeneous flow field on the temperature uniformity in the battery, and discussed the structural parameters of the air-cooled system with the aim of improving the temperature uniformity. A feasible parameter configuration was given Program.

Due to the same type, the size of the battery voltage, internal resistance, capacity and other aspects of the value of the differences in the parameters, so that when used in electric vehicles, the performance indicators often reach the original level of the battery, seriously affecting its The application on the car.