Heat exchanger and method for manufacturing heat exchanger

Abstract

A heat exchanger includes a first plate member, a second plate member, and two or more joints. The first plate member faces a battery. The second plate member is arranged to face the first plate member, and forms a flow path through which a heat exchange medium passes between the first plate member and the second plate member. The joints are portions where the first plate member and the second plate member are joined by welding, and each have one of weld lines that extend in a first direction and are aligned in a second direction orthogonal to the first direction to define the flow path. Among the weld lines, a weld line(s) located closer to the first plate member side than a neutral axis is referred to as a first weld line, and a weld line(s) located closer to the second plate member side than the neutral axis is referred to as a second weld line. A sum of shortest distances from the neutral axis to each of the first weld lines is approximately the same as a sum of shortest distances from the neutral axis to each of the second weld lines.