FLEXIBLE PRINTED CIRCUIT WITH BUS BARS, MANUFACTURING METHOD THEREOF, AND BATTERY SYSTEM

• US 20140370343A1
• Filed: 08/27/2013
• Published: 12/18/2014
• Est. Priority Date: 10/23/2012
• Status: Active Grant

• Current Assignee: Nippon Mektron Limited (NOK Corporation)
• Original Assignee: Nippon Mektron Limited (NOK Corporation)
• Inventors: Nomoto, Hiroshi, Yoshizawa, Koichiro
• Granted Patent: US 10,084,211 B2
• Time in Patent Office: Days
• US Class Current: 429/90
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 50/249 specially adapted for aircraft or vehicles, e.g. cars or trains constructional details of batteries specially adapted for electric vehicles B60L50/64
• CPC Class Codes: H01M 50/284 with incorporated circuit boards, e.g. printed circuit boards [PCB]
• CPC Class Codes: H01M 50/505 comprising a single busbar
• CPC Class Codes: H01M 50/516 by welding, soldering or brazing
• CPC Class Codes: H01M 50/519 comprising printed circuit boards [PCB]
• CPC Class Codes: H01M 50/522 Inorganic material
• CPC Class Codes: H05K 1/0278 Rigid circuit boards or rigid supports of circuit boards locally made bendable, e.g. by removal or replacement of material
• CPC Class Codes: H05K 1/0296 Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295 H05K1/11 takes precedence; lay-out adapted to mounted component configuration H05K1/18
• CPC Class Codes: H05K 3/10 in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49147 Assembling terminal to base

Abstract

To be small-sized/light in weight, and to easily cope with the variation of an inter-electrode pitch of battery cells. A flexible printed circuit with bus bars of one embodiment includes a flexible printed wiring board having a flexible insulating base material and a plurality of wiring patterns provided on one main surface of the flexible insulating base material and provided with land parts for bus bar connection at one end, and a plurality of bus bars and fixed to the land parts for the bus bar connection with an adhesive. The plurality of bus bars and are electrically connected to the respectively corresponding land parts for the bus bar connection in block by a plating layer formed on the bus bar and the land part for the bus bar connection.

Claims

1. A flexible printed circuit with bus bars comprising:

a flexible printed wiring board having a flexible insulating base material, and a plurality of wiring patterns provided on one main surface of the flexible insulating base material and provided with land parts for bus bar connection at one end; and

a plurality of bus bars fixed to the land parts for the bus bar connection with an adhesive,

the plurality of bus bars being electrically connected to the respectively corresponding land parts for the bus bar connection in block by a plating layer formed on the bus bars and the land parts for the bus bar connection.

2. The flexible printed circuit with the bus bars according to claim 1, further comprising

a plurality of duplexed wiring patterns provided on the other main surface of the flexible insulating base material,

wherein

the respective duplexed wiring patterns are electrically connected to the land parts for the bus bar connection through plating through-holes provided on the flexible insulating base material at one end, and are electrically connected to the other end of the wiring patterns at the other end.

3. The flexible printed circuit with the bus bars according to claim 1,

wherein the bus bar is smaller than the land part for the bus bar connection.

4. The flexible printed circuit with the bus bars according to claim 1,

provided with a land part for chip mounting on the other end of the wiring pattern, and

further comprising a semiconductor chip which is mounted on the land part for the chip mounting by solder and monitors a voltage of the wiring pattern.

5. A battery system comprising:

a battery block formed by laminating a plurality of battery cells; and

the flexible printed circuit with the bus bars according to claim 4, which is assembled to the battery block so that electrodes of the battery cells are electrically connected to the bus bars.

6. The flexible printed circuit with the bus bars according to claim 1,

wherein the plurality of bus bars are electrically connected to the land parts for the bus bar connection in block by plating through-holes formed in the flexible insulating base material simultaneously with the plating layer.

7. 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.

8. The manufacturing method of the flexible printed circuit with the bus bars according to claim 7,

wherein the bus bars are fixed to the land parts for the bus bar connection using a conductive adhesive.

9. The manufacturing method of the flexible printed circuit with the bus bars according to claim 7,

wherein

in the fixing of the bus bars,

a bus bar frame having a plurality of bus bars and a frame part provided integrally with the plurality of bus bars through connection parts is prepared, and the bus bar frame and the flexible printed wiring board are positioned so that the plurality of bus bars are abutted to the respectively corresponding land parts for the bus bar connection.

10. The manufacturing method of the flexible printed circuit with the bus bars according to claim 9,

wherein the land parts for the bus bar connection and the bus bars are electrically connected in block, and then the bus bars are cut off from the connection parts.

11. The manufacturing method of the flexible printed circuit with the bus bars according to claim 7,

wherein, in the fixing of the bus bars, the bus bars smaller than the land parts for the bus bar connection are individually surface-mounted on the plurality of land parts for the bus bar connection using a surface mounter.

12. 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.

13. The manufacturing method of the flexible printed circuit with the bus bars according to claim 12,

wherein the bus bars are fixed to the land parts for the bus bar connection using a conductive adhesive.

14. The manufacturing method of the flexible printed circuit with the bus bars according to claim 12,

wherein

in the fixing of the bus bars,

a bus bar frame having a plurality of bus bars and a frame part provided integrally with the plurality of bus bars through connection parts is prepared, and the bus bar frame and the flexible printed wiring board are positioned so that the plurality of bus bars are abutted to the respectively corresponding land parts for the bus bar connection.

15. The manufacturing method of the flexible printed circuit with the bus bars according to claim 14,

wherein the land parts for the bus bar connection and the bus bars are electrically connected in block, and then the bus bars are cut off from the connection parts.

16. The manufacturing method of the flexible printed circuit with the bus bars according to claim 12,

wherein, in the fixing of the bus bars, the bus bars smaller than the land parts for the bus bar connection are individually surface-mounted on the plurality of land parts for the bus bar connection using a surface mounter.

17. The manufacturing method of the flexible printed circuit with the bus bars according to claim 12,

wherein the bus bars and the land parts for the bus bar connection are electrically connected in block by the plating layer formed on the inner wall of the through-hole for electrical conduction.

18. 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.

19. The manufacturing method of the flexible printed circuit with the bus bars according to claim 18,

wherein the bus bars are fixed to the land parts for the bus bar connection using a conductive adhesive.

20. The manufacturing method of the flexible printed circuit with the bus bars according to claim 18,

wherein

in the fixing of the bus bars,

a bus bar frame having a plurality of bus bars and a frame part provided integrally with the plurality of bus bars through connection parts is prepared, and the bus bar frame and the flexible printed wiring board are positioned so that the plurality of bus bars are abutted to the respectively corresponding land parts for the bus bar connection.

21. The manufacturing method of the flexible printed circuit with the bus bars according to claim 20,

wherein the land parts for the bus bar connection and the bus bars are electrically connected in block, and then the bus bars are cut off from the connection parts.

22. The manufacturing method of the flexible printed circuit with the bus bars according to claim 18,

wherein, in the fixing of the bus bars, the bus bars smaller than the land parts for the bus bar connection are individually surface-mounted on the plurality of land parts for the bus bar connection using a surface mounter.