Battery module comprising a connecting member composed of first and second connecting bars

A battery module (100) according to the present invention includes: a plurality of rechargeable batteries (110) and a connecting member (160) to electrically connect a first electrode terminal (130) of a first rechargeable battery (110) with a second electrode terminal (140) of a second rechargeable battery (110). The connecting member (160) comprises a first connecting bar (161) connected to the first electrode terminal (130) of the first rechargeable battery (110), a second connecting bar (162) connected to the second electrode terminal (140) of the second rechargeable battery (110), wherein the second connecting bar (162) comprises a different material than the first connecting bar (161). It further comprises a welding portion (150) connecting the first connecting bar (161) with the second connecting bar (162).