Controller and control method for vehicle

A controller for a vehicle, the vehicle including an internal combustion engine, a motor generator, and a battery that is configured to store power that is generated by the motor generator using a driving force of the internal combustion engine, the controller comprising:

• circuitry configured to execute, when a state of charge of the battery is less than or equal to a threshold, a charging control to charge the battery with the power that is generated by the motor generator using the driving force of the internal combustion engine, the circuitry being configured to
• obtain a temperature of the battery,
• set the threshold to a first threshold during a warm-up period, the warm-up period being a period from a start of the internal combustion engine until the warm-up of the internal combustion engine is completed,
• set the threshold to a second threshold when the warm-up period ends, the second threshold being greater than the first threshold, and
• set the second threshold to be greater when the temperature of the battery is a first temperature than when the temperature of the battery is a second temperature, the second temperature being higher than the first temperature,
• wherein the circuitry is further configured to set the second threshold on a basis of a lowest temperature of the battery among temperatures obtained during a current trip.