Power battery low-temperature charging control method, vehicle and medium

Abstract

The invention discloses a power battery low-temperature charging control method, a computer readable storage medium and a vehicle. The method comprises the steps: collecting the battery temperature and the voltage of each single battery; determining the highest single battery voltage; obtaining charging control parameters according to the battery temperature; and adjusting the charging current according to the highest single battery voltage and the charging control parameters. According to the method, the charging current can be adjusted in real time according to the temperature of the batteryand the charging control parameters, the maximum charging capacity of the battery can be exerted, and the technical effect of self-adaptive adjustment of battery charging is achieved.

Description

technical field [0001] The invention relates to the field of vehicle manufacturing, in particular to a low-temperature charging control method for a power battery, a vehicle and a computer-readable storage medium. Background technique [0002] With the continuous development of science and technology, new energy vehicles, especially pure electric vehicles, are slowly entering every family as a means of transportation. Users have higher and higher requirements for vehicle performance, especially for comfort. Vehicles are required to adapt to different driving needs. However, most of the pure electric vehicles at this stage obviously cannot meet this requirement, especially in the cold winter, when the temperature is too low, the performance of the power battery will decline, both in terms of discharge capacity and battery capacity. Out of service. When the ambient temperature is too low, the capacity that the battery can exert will drop significantly, and lithium ions on th...

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Problems solved by technology

However, most of the pure electric vehicles at this stage obviously cannot meet this requirement, especially in the cold winter, when the temperature is too low, the performance of the power battery will decline, both in terms of discharge capacity and battery capacity. can not be used

When the ambient temperature is too low, the capacity that the battery can exert will drop significantly, and lithium ions on the negative electrode of the battery will continue to accumulate during continuous use, which may even cause an internal short circuit, causing a safety hazard. In addition, as the charging time increases, the charging of the battery The capacity is constantly declining, which is not conducive to the use of vehicles. Therefore, how to achieve the maximum capacity charging of the battery at low temperature, increase the charging capacity of the battery, and reduce the charging time without affecting the service life of the battery has become an important issue for discussion.

[0003] In related technologies, the mainstream solution is to equip the battery with a battery thermal management system, which can quickly increase the battery temperature, but adding a thermal management system will increase the volume of the power battery system and make the structure more complex, increasing the battery temperature. The system cost is increased, and the charging current value cannot be accurately controlled in real time, and the maximum charging capacity of the battery cannot be exerted. When the battery temperature sampling deviation, self-adaptation cannot be realized

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