Control method and control system for delaying thermal diffusion of power battery pack

Abstract

The invention discloses a control method and a control system for delaying the thermal diffusion of a power battery pack. The control method comprises the following steps of acquiring the running state of a single battery of the power battery pack; judging whether a single battery subjected to thermal runaway exists or not according to the running state; if the thermal runaway single batteries exist, obtaining the state of the power battery pack; and if it is recognized that the power battery pack is in a power-off state, controlling the power supply state of a cooling system used for coolingthe power battery pack, so that the cooling system is in a circulating state. According to the control method for delaying the thermal diffusion of the power battery pack, when any single battery in the power battery pack is abnormally overheated, the heat generated by the thermal runaway single batteries can be diffused to other single batteries, so that the temperatures of the thermal runaway single batteries and the adjacent single batteries are reduced, the thermal runaway of the adjacent single batteries is delayed or prevented, enough emergency time is provided for a user, and the use safety of the power battery pack is improved.

Description

technical field [0001] The present application relates to the technical field of power battery manufacturing, and in particular to a control method for delaying thermal diffusion of a power battery pack and a control system for delaying thermal diffusion of a power battery pack. Background technique [0002] At present, the proportion of new energy in the automobile market is increasing. In order to increase the mileage of new energy vehicles, OEMs mostly use lithium-ion power batteries with high energy density, but the safety will become worse if the energy sealing is too high. . In related technologies, after a single battery (battery cell) of the power battery is thermally runaway in a vehicle model equipped with a power battery, a violent chemical reaction will occur inside the single battery to generate a large amount of heat, and the single battery will generate a large amount of heat. The heat cannot be exported in time, which can easily accelerate the thermal runawa...

AI Technical Summary

Problems solved by technology

[0002] At present, the proportion of new energy in the automobile market is increasing. In order to increase the mileage of new energy vehicles, OEMs mostly use lithium-ion power batteries with high energy density, but the safety will become worse if the energy sealing is too high.

In related technologies, after a single battery (battery cell) of the power battery is thermally runaway in a vehicle model equipped with a power battery, a violent chemical reaction will occur inside the single battery to generate a large amount of heat, and the single battery will generate a large amount of heat. The heat cannot be exported in time, which can easily accelerate the thermal runaway of the single battery, and the safety is poor

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