Battery pack

A battery pack comprising:

• a plurality of batteries;
• and
• a bus bar connected to one of the batteries and another of the batteries or connected to one of the batteries and connected to an external electrical device, wherein
• the bus bar includes
• a first member having conductivity, and
• a second member having conductivity, being laminated and bonded with the first member, and being made of the same material as the first member,
• the first member includes
• a first mounting portion mounted on an electrode terminal of the one battery or the electrical device,
• a first contact portion that is continuous with the first mounting portion and is in contact with the second member in a lamination direction, and
• a first non-contact portion that is continuous with the first contact portion and is at least partially not in contact with the second member in the lamination direction,
• the second member includes
• a second mounting portion mounted on an electrode terminal of the another battery,
• a second contact portion that is continuous with the second mounting portion and is in contact with the first contact portion of the first member in the lamination direction, and a second non-contact portion that is continuous with the second contact portion and is at least partially not in contact with the first contact portion of the first member in the lamination direction,
• the first contact portion of the first member and the second contact portion of the second member include a solid-phase bonding portion,
• the first non-contact portion of the first member is located closer to the second mounting portion of the second member than the solid-phase bonding portion,
• the second non-contact portion of the second member is located closer to the first mounting portion of the first member than the solid-phase bonding portion, and
• bas bar has at least one or more configurations of the following configuration (1), configuration (2), configuration (3), configuration (4), configuration (5), and configuration (6) and at least one or more configurations of the following configuration (7), configuration (8), and configuration (9) are included,
• in the configuration (1),
• at least a distal end of the first non-contact portion of the first member is inclined with respect to a direction intersecting with the lamination direction and is separated from the second contact portion of the second member,
• in the configuration (2),
• the first member has the solid-phase bonding portion formed at a place that does not overlap with the first mounting portion in the lamination direction,
• the second member includes a second bent portion that is bent along the lamination direction from the second contact portion between the second contact portion and the second mounting portion, and
• at least a distal end of the first non-contact portion of the first member is separated from the second bent portion of the second member,
• in the configuration (3),
• a distal end of the first non-contact portion of the first member includes a curved or inclined corner portion facing the second member in the lamination direction, and
• a length of the corner portion of the first member along the lamination direction is 1/10 or more of a length of the first non-contact portion of the first member along the lamination direction or 0.1 mm or more,
• in the configuration (4),
• the second member includes a second inclined portion that is inclined from the second contact portion toward the direction intersecting with the lamination direction between the second contact portion and the second mounting portion, and
• at least a distal end of the first non-contact portion of the first member is separated from the second inclined portion of the second member,
• in the configuration (5),
• the second member includes a recessed portion that is recessed in a direction apart from the first non-contact portion of the first member with respect to the lamination direction between the second contact portion and the second mounting portion, and at least a distal end of the first non-contact portion of the first member is separated from the recessed portion of the second member,
• in the configuration (6),
• a pair of the first non-contact portions of the first member are formed on both sides of the first contact portion of the first member, and
• at least distal ends of the pair of first non-contact portions of the first member are each separated from the second member, in the configuration (7),
• a distal end of the second non-contact portion of the second member includes a curved or inclined corner portion facing the first member in the lamination direction, and
• a length of the corner portion of the second member along the lamination direction is 1/10 or more of a length of the second non-contact portion of the second member along the lamination direction or 0.1 mm or more,
• in the configuration (8),
• at least a distal end of the second non-contact portion of the second member is inclined with respect to the direction intersecting with the lamination direction and is separated from the first contact portion of the first member, and
• in the configuration (9),
• the first member includes a recessed portion that is recessed in the direction apart from the second non-contact portion of the second member with respect to the lamination direction between the first contact portion and the first mounting portion, and at least a distal end of the second non-contact portion of the second member is separated from the recessed portion of the first member.

A battery pack comprising:

• a plurality of batteries;
• and
• a bus bar connected to one of the batteries and another of the batteries or connected to one of the batteries and connected to an external electrical device, wherein
• the bus bar has a first member having conductivity, and
• a second member having conductivity, being laminated and bonded with the first member, and having lower hardness than the first member,
• the first member includes a first contact portion in contact with the second member in a lamination direction, and
• a non-contact portion that is annularly continuous with the first contact portion from the outside of the first contact portion on a surface of the first contact portion that intersects with the lamination direction and includes an annular portion that is not contact with the second member in the lamination direction,
• the second member includes a second contact portion that is in contact with the first contact portion of the first member in the lamination direction,
• the non-contact portion of the first member annularly surrounds the second contact portion of the second member on a surface intersecting with the lamination direction, and
• the first contact portion of the first member and the second contact portion of the second member include a solid-phase bonding portion annularly solid-phase bonded on a surface intersecting with the lamination direction and along a region where the non-contact portion of the first member is located.

A battery pack comprising:

• a plurality of laminated batteries each including an electrode terminal;
• and
• a bus bar connected to an electrode terminal of a first battery, an electrode terminal of a second battery electrically connected to the first battery, or an external electrical device, wherein the bus bar has
• a first member having conductivity, a second member having conductivity,
• an overlapping portion in which the first member and the second member are partially overlapped, and a solid-phase bonding portion formed on the overlapping portion,
• the first member has
• a first mounting portion having a first mounting surface connected to any of the first battery or the electrical device and a first rear surface located on an opposite side of the first mounting surface,
• a first overlapping portion configuring the overlapping portion, and
• the solid-phase bonding portion formed on the first overlapping portion and disposed apart from the first rear surface, the second member has
• a second mounting portion having a second mounting surface connected to any of the second battery or the electrical device in a case where the first member is connected to the first battery or the first battery in a case where the first member is connected to the electrical device, and a second rear surface located on an opposite side of the second mounting surface, a second overlapping portion configuring the overlapping portion, and
• the solid-phase bonding portion formed on the second overlapping portion and disposed apart from the second rear surface, and the first overlapping portion has
• a non-contact portion located apart from the second overlapping portion in an overlapping direction of the first overlapping portion and the second overlapping portion, and
• a distal end formed in the non-contact portion.