Heating control method and heating control device

A heating control method, comprising:

• acquiring, by a heating controlling device, an average current value in a heating circuit of a power battery pack based on currents sampled by an analog-to-digital converter, wherein the average current value comprises an average current value of an nth cycle, and an average current value of an (n−1)th cycle and an average current value of an (n−2)th cycle, wherein the n is equal to or greater than 3 and wherein each cycle is a period of time for current sampling;
• calculating, by the heating controlling device, a current output value required for the nth cycle according to the average current value of the nth cycle, the average current value of the (n−1)th cycle, the average current value of the (n−2)th cycle and a preset current value;
• and
• outputting, by the heating controlling device, a Pulse width Modulation (PWM) signal to a switch device of the heating circuit according to a pre-calibrated PWM control parameter, wherein the pre-calibrated PWM control parameter corresponds to the current output value required for the nth cycle,
• wherein an actual current value is generated in the heating circuit according to switching of the switch device based on the PWM signal, and wherein a difference between the actual current value and the preset current value is less than a preset threshold, and wherein the power battery pack is heated by a discharge process and a charging process with the generated actual current value;
• wherein the calculating of the current output value required for the nth cycle according to the average current value of the nth cycle, the average current value of the (n˜1)th cycle, the average current value of the (n−2)th cycle and the preset current value comprises:
• setting a difference between the preset current value and the average current value of the nth cycle as an nth cycle difference value, setting a difference between the preset current value and the average current value of the (n−1)th cycle as an (n−1)th cycle difference value, and setting a difference between the preset current value and the average current value of the (n−2)th cycle as an (n−2)th cycle difference value;
• acquiring a state of charge section of the power battery pack from a battery management system;
• determining a current increment required for the nth cycle according to a pre-calibrated feedback adjustment coefficient corresponding to the state of charge section, the nth cycle difference value, the (n−1)th cycle difference value and the (n−2)th cycle difference value;
• determining the current output value required for the nth cycle based on the current increment and the average current value of the (n−1)th cycle.