Electrode terminal and secondary battery provided with said electrode terminal
The present disclosure provides an electrode terminal with high conductivity and high junction strength. The electrode terminal disclosed herein includes a metallic first member and a metallic plate-shaped second member, wherein the first member has a connecting portion to be connected to the second member, and the connecting portion of the first member is bonded to one surface of the second member by a conductive adhesive.
1 . An electrode terminal of a secondary battery, the electrode terminal comprising:
a metallic first member, and
a metallic plate-shaped second member having a blind hole, wherein
a bottom of the blind hole has a recessed portion filled with an electrically conductive adhesive,
the first member has a connecting portion to be connected to the second member,
the connecting portion of the first member includes a shaft portion, wherein an end of the shaft portion is bonded to the bottom of the blind hole of the second member by the electrically conductive adhesive, and
at least a part of the connecting portion of the first member is a metallically joined part at the bottom of the blind hole of the second member in a location radially inward from the shaft portion bonded by the electrically conductive adhesive, wherein the metallically joined part is formed by a manufacturing process that includes at least one of ultrasonic joining, diffusion joining, friction pressure welding, laser welding, or resistance welding, and wherein the recessed portion is a continuous groove surrounding the metallically joined part or a plurality of the recessed portions is provided at predetermined intervals around the metallically joining portion, and
wherein the electrically conductive adhesive contains an electrically conductive material and a thermosetting resin.
2 . The electrode terminal according to claim 1 , wherein the first member and the second member are constituted of different metals.
3 . The electrode terminal according to claim 1 , containing metallic particles as the electrically conductive material.
4 . An electrode terminal of a secondary battery, the electrode terminal comprising:
a metallic first member,
and a metallic plate-shaped second member having a blind hole, wherein
a bottom of the blind hole has a recessed portion filled with an electrically conductive adhesive,
the first member has a connecting portion to be connected to the second member,
the connecting portion of the first member includes a shaft portion, wherein an end of the shaft portion is bonded to the bottom of the blind hole of the second member by the electrically conductive adhesive, and
at least a part of the connecting portion of the first member is a metallically joined part at the bottom of the blind hole of the second member in a location radially inward from the shaft portion bonded by the electrically conductive adhesive, wherein the metallically joined part is formed by a manufacturing process that includes at least one of ultrasonic joining, diffusion joining, friction pressure welding, laser welding, or resistance welding, and wherein the recessed portion is a continuous groove surrounding the metallically joined part or a plurality of the recessed portions is provided at predetermined intervals around the metallically joining portion,
wherein the electrically conductive adhesive contains an electrically conductive material and a thermosetting resin,
the electrically conductive adhesive contains metallic particles as the electrically conductive material, and
wherein the metallic particles are at least one selected from the group consisting of silver, copper, nickel, aluminum, and gold.
5 . The electrode terminal according to claim 1 , wherein the thermosetting resin is at least one selected from the group consisting of epoxy resin, urethane resin, silicone resin, and thermosetting acrylic resin.
6 . A secondary battery, comprising:
an electrode body including a positive electrode and a negative electrode;
a battery case housing therein the electrode body; and
a positive electrode terminal and a negative electrode terminal electrically connected to the positive electrode and the negative electrode of the electrode body, respectively, wherein
at least one of the positive electrode terminal and the negative electrode terminal is constituted of the electrode terminal according to claim 1 .
7 . The electrode terminal according to claim 1 , wherein
the metallically joined part of the connecting portion of the first member is located at a central axis of the shaft portion.
8 . The electrode terminal according to claim 1 , wherein the blind hole houses at least a part of the connecting portion of the first member.
9 . The electrode terminal according to claim 4 , wherein the first member and the second member are constituted of different metals.
10 . The electrode terminal according to claim 4 , wherein the thermosetting resin is at least one selected from the group consisting of epoxy resin, urethane resin, silicone resin, and thermosetting acrylic resin.
11 . The electrode terminal according to claim 4 , wherein
the metallically joined part of the connecting portion of the first member is located at a central axis of the shaft portion.
12 . The electrode terminal according to claim 4 , wherein the blind hole houses at least a part of the connecting portion of the first member.