Battery heat dissipation method, battery heat dissipation device and battery pack

Abstract

The invention discloses a battery heat dissipation method, a battery heat dissipation device and a battery pack and belongs to the field of automobile batteries. The battery heat dissipation method comprises the following steps of S1, measuring a temperature parameter T of a preset position of a battery pack; S2, calculating a first-order derivative of T and time to obtain T', and calculating a second-order derivative of T and time to obtain T''; S3, judging whether T'' is greater than a first preset value a or not, if so, executing S4, and otherwise, executing S5; S4, judging whether T is greater than a second preset value T1 or not, if so, starting the liquid cooling system, otherwise, carrying out S5; S5, judging whether T' is greater than a third preset value b or not, if so, executingS6, and otherwise, executing S7; S6, judging whether T is larger than a fourth preset value T2 or not, if yes, the liquid cooling system is started, and if not, the air cooling system is started; andS7, judging whether T is larger than a fifth preset value T3 or not, T2 is larger than T1 and larger than T3, if yes, the air cooling system is started, and if not, the S3 is executed again. The battery pack has both air cooling heat dissipation and liquid cooling heat dissipation, the cooling mode can be switched according to needs, cooling efficiency is improved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of automobile batteries, in particular to a battery heat dissipation method, a battery heat dissipation device, and a battery pack. Background technique [0002] "Battery system" refers to an energy storage device composed of one or more battery packs and corresponding accessories (management system, high-voltage circuit, low-voltage circuit, thermal management equipment, and mechanical assembly, etc.). "Battery pack" refers to a unit that obtains electrical energy from the outside and can output electrical energy to the outside. [0003] At present, power batteries have been widely used in new energy commercial vehicles, and hybrid vehicles have gradually become the mainstream of commercial vehicles in the future. Different from passenger cars, the power and energy of power batteries required by commercial vehicles are often greater than those of passenger cars, so there are higher requirements for battery...

AI Technical Summary

Problems solved by technology

However, if the liquid cooling method is used alone, the compressor and water pump need to be turned on after the battery temperature exceeds the temperature limit. Although the cooling effect is good, the energy consumption of the compressor is relatively high.

Moreover, under the current electric vehicle architecture, both the compressor and the water pump obtain energy from the battery itself, which inevitably affects the driving range of the electric vehicle.

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