Power battery heating device and control method

Abstract

The invention relates to a heating device which can uniformly heat a power battery used for an automobile, and a control method. The heating device comprises heating pieces, temperature sensors and a control unit. The heating pieces are attached to surfaces of batteries to heat the batteries. The temperature sensors are fixed to temperature evaluation points on the surfaces of the batteries and the heating pieces. The control unit is connected with the temperature sensors and the power batteries and controls the temperature of the batteries and the heating device. The power batteries form a battery set structure composed of the batteries. The intervals between the batteries are larger than the thickness of the heating pieces. The control unit is used for collecting and processing temperature data, monitoring current and voltage in circuits, diagnosing insulating faults of the heating device and turning on or turning off all or n specific heating piece circuits according to preset conditions, wherein n is larger than or equal to 1. The heating device can safely, rapidly, uniformly and accurately heat the power batteries.

Description

technical field [0001] The invention relates to the technical field of thermal management of power batteries of new energy vehicles. Background technique [0002] At present, the main source of energy for electric vehicles is the power battery pack on the car. Considering that the car needs to drive in complex road conditions and harsh environments, the power battery as the energy source also needs to work normally under such conditions, especially at low temperatures. In harsh environments, power batteries need to have excellent charge and discharge performance to meet customer needs. However, the characteristics of the power battery itself determine that its charging and discharging performance in low temperature environments is poor, and charging it below zero degrees Celsius may even be dangerous. At present, the commonly used heating systems have problems such as low heating efficiency, long heating time, excessive temperature difference, lack of safety diagnosis funct...

AI Technical Summary

Problems solved by technology

However, the characteristics of the power battery itself determine its poor charge and discharge performance in low temperature environments, and it may even be dangerous to charge it below zero degrees Celsius

At present, the commonly used heating systems have problems such as low heating efficiency, long heating time, excessive temperature difference, lack of safety diagnosis function of the heating system or failure to meet the use requirements, etc.

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