Battery charging method and vehicle

The invention relates to a battery charging method and a vehicle. The method comprises the following steps: before a battery is charged or in a charging process, carrying out self-heating on the battery by adopting alternating current, and determining whether the battery has a lithium separation trend or not; under the condition that the battery has the lithium separation trend, a preset first operation is executed on the battery, and the first operation comprises the step of adjusting alternating current parameters of alternating current for self-heating the battery. According to the method, before the battery is charged or in the charging process, the battery is self-heated by adopting alternating current, and the phenomenon that the battery is heated unevenly due to external heating is avoided; moreover, in the heating process, whether the battery has a lithium precipitation trend or not is determined, and the preset first operation is executed on the battery under the condition that the battery has the li