Battery pack

Abstract

The invention provides a battery pack. The battery pack comprises a battery module, a battery pack box body, and a lower cover heat preservation layer, wherein the battery module comprises a pluralityof battery units arranged in an array form, the battery pack box body comprises transverse beams and longitudinal beams, a plurality of transverse beams and a plurality of longitudinal beams are usedfor limiting a plurality of module accommodating spaces, heat preservation layers are additionally arranged at positions of the transverse beams and the longitudinal beams which are near to a part accommodating space, a battery management system and a high-voltage electrical appliance box are accommodated in the part accommodating space, the lower cover heat preservation layer is arranged at oneside, deviating from the battery module, of the battery pack box body, and the projection of the lower cover heat preservation layer on a plane where the battery module is located at least covers outermost-side battery units arranged at four side edges of the battery module. The invention provides a battery pack with the heat preservation box body structure. The heat preservation effect is improved, meanwhile, the heat preservation cost is reduced, heat isolation is performed on the position of the box body, where the battery module is located, stood with relatively large influence of an environmental temperature, the emphasis lies in that the battery module with relatively poor heat isolation performance is improved on the premise of using a heat isolation material as less as possible, and heat preservation and temperature equalization are achieved.

Description

technical field [0001] The invention relates to the technical field of battery packs, in particular to a battery pack for realizing heat preservation function. Background technique [0002] The large temperature difference of lithium-ion power batteries will directly cause some defects: (1) inconsistent battery attenuation, and even cause accelerated battery aging; (2) large errors in battery state estimation, and even cause the vehicle to be unable to drive; (3) reduce the battery pack Cooling / heating efficiency, prolonging the pre-cooling / pre-heating time, increasing energy consumption, and even causing the vehicle to be unable to drive, and in severe cases may cause risks such as fire and explosion. [0003] Low battery temperature will reduce the available capacity of the battery and the available power of the battery. When the vehicle is sold and used in colder regions, in order to delay the impact of low temperature on the available capacity and power of the battery, ...

AI Technical Summary

Problems solved by technology

[0002] The large temperature difference of lithium-ion power batteries will directly cause some defects: (1) inconsistent battery attenuation, and even cause accelerated battery aging; (2) large errors in battery state estimation, and even cause the vehicle to be unable to drive; (3) reduce the battery pack Cooling / heating efficiency, prolonging the pre-cooling / pre-heating time, increasing energy consumption, and even causing the vehicle to be unable to drive, and in severe cases may cause risks such as fire and explosion

[0005] Therefore, for the power battery, whether the temperature is too high, the temperature is too low or the temperature difference is too large, it will have a great adverse effect on the performance of the power battery and even the vehicle.

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