Heatsink bus for electronic switch

• US 5,153,449 A
• Filed: 08/28/1990
• Issued: 10/06/1992
• Est. Priority Date: 08/28/1990
• Status: Expired due to Fees

• Current Assignee: Milwaukee Electric Tool Corporation (Techtronic Industries Company Limited)
• Original Assignee: Milwaukee Electric Tool Corporation (Techtronic Industries Company Limited)
• Inventors: Glasgow, Kevin, Domenella, Gino P., Crook, Fred, West, Michael R.
• Primary Examiner(s): Pellinen, A. D.
• Assistant Examiner(s): Osborn, David
• Application Number:
  US07/574,296
• Time in Patent Office: 770 Days
• Field of Search: 361/407, 361/386-389, 174/16.2, 174/16.3, 357/81, 165/80.3, 307/10.1, 307/43, 307/44, 307/48, 307/66, 307/112, 307/113, 307/115, 429/120, 429/121, 429/149, 429/150, 429/7, 429/9, 363/141, 363/144, 29/854, 72/260
• US Class Current: 307/66
• CPC Class Codes: H01L 2224/05554 being square
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/49113 the connectors connecting different bonding areas on the semiconductor or solid-state body to a common bonding area outside the body, e.g. converging wires
• CPC Class Codes: H01L 2224/49175 Parallel arrangements
• CPC Class Codes: H01L 23/492 Bases or plates or solder therefor
• CPC Class Codes: H01L 25/16 the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/0445 Multimode batteries, e.g. containing auxiliary cells or electrodes switchable in parallel or series connections
• CPC Class Codes: H01M 10/122 Multimode batteries
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor

Abstract

An electronic circuit device includes a metallic member composed of a thermally and electrically conductive material and comprising a unitary mass defining a heatsink and being free of mechanical or electrical transition joints. Electronic switching devices are mounted on the member and in electrical and thermal contact therewith. A control circuit and a conductor are each mounted on the member and adjacent the switching circuit devices and electrical conductors interconnect the switching circuit devices with the control circuit. The control circuit and the conductor are thermally and electrically isolated from the metallic member. The metallic member comprises a heatsink for the electronic switching devices and a conductor for currents being switched thereby.

Claims

1. In combination, a metallic member composed of a thermally and electrically conductive material, said member comprising a unitary mass defining a heatsink and being free of mechanical or electrical transition joints,

at least one switching means mounted on said member and in electrical and thermal contact therewith, control circuit means and electrical conductor means each mounted on said member and adjacent said switching means,

said electrical conductor means connecting said switching means to said control circuit means, said metallic member acting as a heatsink for the switching means and as a conductor for current being switched thereby.

2. The combination set forth in claim 1 wherein said member has a support surface formed thereon,

said switching means, said control circuit means and said electrical conductor means being mounted on said support surface,

first and second conductive means, respectively, connecting said switching means to said control circuit and to said conductor means and each having terminations on opposite ends thereof,

said support surface, said switching means, said control circuit means and said electrical conductor means all being configured such that all of said terminations are at the same relative elevation.

3. The combination set forth in claim 2 wherein there are a plurality of switching means, a first plurality of conductive means connecting each of said switching means to said control circuit means and a second plurality of conductive means connecting said switching means in a parallel circuit relation to said electrical conductor means.

4. The combination set forth in claim 2 wherein there is a first electrical and heat barrier means between said member and said control circuit means and a second thermal and electrical barrier means between said conductor means and said member.

5. The combination set forth in claim 4 wherein said support surface includes first, second and third support surfaces, each located at a different relative elevation,

said control circuit mean being mounted on said first support surface,

said switching means being mounted on said second support surface and said conductor means being mounted on said third surface,

the thickness of said control circuit means, said switching circuit means and said conductor means and the relative elevations of said first, second and third support surfaces being such that the terminations of said conductor means are at the same elevation.

6. The combination of a storage battery having primary cells and auxiliary cells,

first and second terminal means in circuit with the primary cells, and third and fourth terminal means in circuit with the auxiliary cells,

and at least one switching means in circuit between said second and third terminal means and operative to place said primary and auxiliary cells in a parallel circuit relation,

said switching means including a metallic member composed of a thermally and electrically conductive material,

said member comprising a unitary mass defining a heatsink and being free of mechanical or electrical transition joints,

at least one of said switching means mounted on said member in electrical and thermal contact therewith,

control circuit means and conductor means mounted on said member and adjacent said switching means,

and electrical conductor means connecting said switching means to said control circuit, said member acting as a heatsink for said switching means and as a conductor for current being switched thereby.

7. The combination set forth in claim 6 wherein said member has a support surface formed thereon,

said switching means, said control circuit means and said electrical conductor means being mounted on said support surface,

first and second conductive means, respectively, connecting said switching means to said control circuit and to said conductor means and each having terminations on opposite ends thereof,

said support surface, said switching means, said control circuit means and said electrical conductive means all being configured such that all of said terminations are at the same relative elevation.

8. The combination set forth in claim 6 wherein there are a plurality of switching means, a first plurality of conductive means connecting each of said switching means to said control circuit means and a second plurality of conductive means connecting-said electronic switching means to said electrical conductor means.

9. The combination set forth in claim 7 wherein there is a first electrical and heat barrier means between said member and said control circuit means and a second thermal and electrical barrier means between said conductor means and said member.

10. The combination set forth in claim 9 wherein said support surface includes first, second and third support surfaces each located at a different relative elevation, said control circuit mean being mounted on said first support surface, said switching means being mounted on said second support surface and said conductor means being mounted on said third surface, the thickness of said control circuit means, said switching circuit means and said conductor circuit means and the relative elevations of said first, second and third support surfaces being such that the terminations of said conductive means are at the same elevation.

11. In combination, a metallic member composed of a thermally and electrically conductive material, said member comprising a unitary mass defining a heatsink and being free of mechanical or electrical transition joints,

first electronic circuit means mounted on said member and in electrical and thermal contact therewith, second electronic circuit means mounted on said member and adjacent said first electronic circuit means,

first and second terminal means mounted on said member, said first terminal means being connected in circuit with said member and constructed and arranged to be connected to a source of electrical energy and said second terminal means being insulated from said member and constructed and arranged to be connected to a controlled device,

and electrical conductor means connecting said first and second electronic circuit means to each other and said first electronic circuit means to said first terminal means, said metallic member acting as a heatsink for the first electronic circuit means and as a conductor for current being controlled thereby.

12. The combination set forth in claim 11 wherein said member has a surface formed thereon,

said first and second electronic circuit means and said first terminal means being mounted on said first surface,

first and second conductive means, respectively, connecting said first and second electronic circuit means to each other and said first circuit means to said second terminal means, each conductive means having terminations on opposite ends thereof,

said surface, said first and second electronic circuit means and said second terminal means all being configured such that all of said terminations are at the same relative elevation.

13. The combination set forth in claim 12 wherein there are a plurality of first electronic circuit means, a first plurality of conductive means connecting each of said first circuit means to said second electronic circuit means and a second plurality of said conductive means connecting each of said first circuit means to said second terminal means.

14. The combination set forth in claim 12 wherein there is a first electrical and heat barrier means between said member and said second electronic circuit means and a second thermal and electrical barrier means between said second terminal means and said member.

15. The combination set forth in claim 14 wherein said first surface includes first, second and third support surfaces, each located at a different relative elevation,

said first electronic circuit means being mounted on said first support surface,

said second electronic circuit means being mounted on said second support surface and said second terminal means being mounted on said third surface,

the thickness of said first electronic circuit means, said second electronic circuit means and said second terminal means and the relative elevations of said first, second and third support surfaces being such that the terminations of said conductor means are at the same elevation.

16. A method of manufacturing an electrical circuit assembly comprising the steps of:

extruding an elongate shaped member formed of a metallic material having high thermal and electrical conductivity,

severing a first predetermined length of said extruded member to provide a unitary member which defines a conductor and heatsink and is free of mechanical and electrical transition joints,

mounting electronic circuit means in thermal and electrical contact with a surface of said unitary member, such that the unitary member provides current to the electronic circuit means mounting control circuit means and conductor means on said unitary member and adjacent said electronic circuit means, and electrically connecting said electronic circuit means to said control circuit means with said conductor means and electrically insulating said control circuit means and said conductor means from said member.

17. The method set forth in claim 16 and including the step of providing first and second thermal and electrical barrier means, respectively, between said member and said control circuit means and said conductor means.

18. The method set forth in claim 17 and including the steps of providing a plurality of electrical switching devices and a first plurality of said conductor means, connecting said first and second electric switching devices to said control circuit means with said first plurality of said conductors and a second plurality of said conductor means and connecting said switching circuit devices to said first and second conductor means.

19. The method set forth in claim 18 including the steps of providing a first electrical and heat barrier means between said member and said control circuit means and a second thermal and electrical barrier means between said conductive means and said member.

20. The method set forth in claim 19 and including the steps of forming first, second and third support surfaces on one face of same member and locating each at a different relative elevation, mounting said control circuit means on said first support surface, mounting said electronic switching means on said second support surface and mounting said conductor means on said third surface, the thickness of said control circuit means, said electronic switching means and said conductor circuit means and the relative elevations of said first, second and third support surfaces being such that the terminations of said conductor means are at the same elevation.

21. A method of manufacturing an electrical circuit assembly comprising the steps of:

forming an elongate shaped member comprising a metallic material having high thermal and electrical conductivity,

severing a first predetermined length of said member to provide a unitary member which defines a conductor and heatsink and is free of mechanical and electrical transition joints,

mounting electronic circuit means in thermal and electrical contact with a surface of said unitary member such that the unitary member provides current to the electronic circuit means, mounting control circuit means and conductor means on said unitary member and adjacent said electronic circuit means, and electrically connecting said electronic circuit means to said control circuit means with said conductor means and electrically insulating said control circuit means and said conductor means from said member.