BATTERY MODULE, ELECTRONIC DEVICE USING THE SAME, AND ASSEMBLY METHOD OF BATTERY MODULE

A battery module includes n batteries, n≥3. The n batteries are stacked in a sequence along a thickness direction of the battery, and m is defined as a round number of n/2, and the first battery and the m-th battery satisfy at least one of the following conditions: a1: a capacity of the m-th battery is greater than that of the first battery; b1: under a same state of charge, an open circuit voltage of the m-th battery is less than that of the first battery; and c1 under a same state of charge, an AC impedance of the m-th battery is less than that of the first battery.