Battery module, method for manufacturing battery module, electronic device, and electric vehicle

A method for manufacturing a battery module in which an all-solid-state battery having a positive electrode terminal and a negative electrode terminal, a semiconductor element, and a PTC element are solder-bonded to a circuit board, the method comprising:

• electrically connecting the semiconductor element between the positive electrode terminal and the negative electrode terminal by the solder-bonding,
• connecting the PTC element in series between the positive electrode terminal or the negative electrode terminal and the semiconductor element by the solder-bonding, and
• tripping the PTC element before an atmospheric temperature during the solder-bonding reaches a junction temperature of the semiconductor element,
• wherein the PTC element is configured to trip before the semiconductor element reaches a junction temperature,
• wherein a trip temperature of the PTC element is a temperature set within a range of 50° C. below the junction temperature of the semiconductor element, and
• wherein the trip temperature of the PTC element is 90° C. or more and 140° C. or less.