Electrical connection structure
The present invention provides a means for improving the output performance of a battery. An electrical connection structure of the present invention includes a current collector which includes a conductive resin layer containing a polymer material and a conductive filler and a conductive member which is in electrical contact with the conductive filler.
1. An electrical connection structure comprising:
a current collector which comprises a conductive resin layer comprising a polymer material and a conductive filler; and
a conductive member which is in electrical contact with the conductive filler, wherein
the conductive member contains a conductive material having a fiber shape, a plate shape, a shape including a lump, a mesh shape, or a granular shape having an average particle diameter of 0.01 to 10 μm,
the electrical connection structure has a structure in which at least a part of the conductive member extends beyond the surface of the conductive resin layer and is present inside the conductive resin layer, and
a contact resistance at a pressing pressure of 0.5 kg/cm 2 is 2Ω or less.
2. The electrical connection structure according to claim 1 , wherein the electrical connection structure is obtained by applying an ink comprising a conductive material to the current collector to form a coating film on the current collector.
3. The electrical connection structure according to claim 1 , wherein the conductive member comprises at least one conductive material selected from the group consisting of 1) a metal having an ionization tendency lower than that of 2) iron, 3) titanium, 4) zirconium, 5) tantalum, 6) niobium, 7) an alloy having a main component selected from iron, titanium, zirconium, tantalum, niobium, or a metal having an ionization tendency lower than that of iron, or 8) a conductive carbon.
4. The electrical connection structure according to claim 3 , wherein the conductive member further comprises a polymer material, and
a content of the conductive material in the conductive member is more than a content of the conductive filler in the conductive resin layer.
5. The electrical connection structure according to claim 1 , wherein the conductive member is comprised of a conductive carbon.
6. The electrical connection structure according to claim 3 , wherein the conductive member further comprises an epoxy resin.
7. The electrical connection structure according to claim 1 , wherein a conductive adhesive member is disposed between the conductive member and the current collector.
8. The electrical connection structure according to claim 1 , wherein the conductive member has a laminate structure of two or more layers and a conductive adhesive member is disposed between at least two layers of the conductive member.
9. A method for producing the electrical connection structure according to claim 1 , comprising:
a step of applying an ink comprising the conductive material to the current collector to form a laminate in which a coating film is formed on the current collector.
10. The method for producing the electrical connection structure according to claim 9 , further comprising a step of subjecting the laminate to heat pressing.
11. The electrical connection structure according to claim 1 , wherein the metal having the ionization tendency lower than that of iron is selected from cobalt, nickel, tin, antimony, copper, silver, palladium, iridium, platinum, or gold.
12. The electrical connection structure according to claim 1 , wherein
the conductive material has the fiber shape, and
the fiber shape has an average fiber length of 0.1 to 100 μm and an average diameter of 10 nm to 10 μm.