Flexible printed circuit with bus bars, manufacturing method thereof, and battery system

A manufacturing method of a flexible printed circuit with bus bars to be assembled to a battery block formed by laminating a plurality of battery cells, comprising:

• preparing a double-sided metal-clad laminate having a flexible insulating base material, and a first metal film and a second metal film provided respectively on a first main surface and a second main surface of the flexible insulating base material;
• forming a through-hole for electrical conduction passing through the double-sided metal-clad laminate in a thickness direction;
• carrying out electroplating treatment of the double-sided metal-clad laminate, forming a first plating layer on the first and second metal films and on an inner wall of the through-hole for electrical conduction, and electrically connecting the first metal film and the second metal film by the first plating layer;
• processing the first metal film of the double-sided metal-clad laminate and the first plating layer formed thereon, and forming a flexible printed wiring board having a plurality of wiring patterns provided with land parts for bus bar connection at one end;
• insulating and protecting the wiring patterns of the flexible printed wiring board with a flexible insulating cover material so as to expose at least a part of the land parts for the bus bar connection;
• fixing the bus bars for electrically connecting electrodes of the adjacent battery cells with each other to the respective land parts for the bus bar connection;
• and
• carrying out electroplating treatment of the flexible printed wiring board to which the plurality of bus bars are fixed, forming a second plating layer on the bus bars and an exposed surface of the land parts for the bus bar connection, and electrically connecting the bus bars and the land parts for the bus bar connection in block by the second plating layer.

A manufacturing method of a flexible printed circuit with bus bars to be assembled to a battery block formed by laminating a plurality of battery cells, comprising:

• preparing a double-sided metal-clad laminate having a flexible insulating base material, and a first metal film and a second metal film provided respectively on a first main surface and a second main surface of the flexible insulating base material;
• forming a through-hole for electrical conduction passing through the double-sided metal-clad laminate in a thickness direction;
• processing the first metal film of the double-sided metal-clad laminate, and forming a flexible printed wiring board having a plurality of wiring patterns provided with land parts for bus bar connection at one end;
• insulating and protecting the wiring patterns of the flexible printed wiring board with a flexible insulating cover material so as to expose at least a part of the land parts for the bus bar connection;
• fixing the bus bars for electrically connecting electrodes of the adjacent battery cells with each other to the respective land parts for the bus bar connection;
• and
• carrying out electroplating treatment of the flexible printed wiring board to which the plurality of bus bars are fixed, forming a plating layer on an inner wall of the through-hole for electrical conduction, the bus bars and an exposed surface of the land parts for the bus bar connection, electrically connecting the first metal film and the second metal film and electrically connecting the bus bars and the land parts for the bus bar connection in block by the plating layer.

A manufacturing method of a flexible printed circuit with bus bars to be assembled to a battery block formed by laminating a plurality of battery cells, comprising:

• preparing a one-sided metal-clad laminate having a flexible insulating base material, and a metal film provided on one main surface of the flexible insulating base material,
• processing the metal film of the one-sided metal-clad laminate, and forming a flexible printed wiring board having a plurality of wiring patterns provided with land parts for bus bar connection at one end,
• insulating and protecting the wiring patterns of the flexible printed wiring board with a flexible insulating cover material so as to expose at least a part of the land parts for the bus bar connection,
• fixing the bus bars for electrically connecting electrodes of the adjacent battery cells with each other to the respective land parts for the bus bar connection, and
• carrying out electroplating treatment of the flexible printed wiring board to which the plurality of bus bars are fixed, forming a plating layer on the bus bars and an exposed surface of the land parts for the bus bar connection, and electrically connecting the bus bars and the land parts for the bus bar connection in block by the plating layer.