Battery mounting apparatuses, electronic devices, and methods of forming electrical connections

• US 6,161,281 A
• Filed: 02/24/1999
• Issued: 12/19/2000
• Est. Priority Date: 02/19/1998
• Status: Expired due to Term

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Technology, Inc.
• Inventors: Dando, Ross S., Lake, Rickie C., Kumar, Krishna
• Primary Examiner(s): Nuzzolillo, Maria
• Assistant Examiner(s): DOVE, TRACY MAE
• Application Number:
  US09/257,158
• Time in Patent Office: 664 Days
• Field of Search: 29/854.855, 361/772, 361/777, 361/760, 174/260, 174/261, 264/272.21, 429/121, 429/7
• US Class Current: 29/854
• CPC Class Codes: H01M 50/216 adapted for button or coin cells
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10037 Printed or non-printed battery
• CPC Class Codes: H05K 2201/10977 Encapsulated connections
• CPC Class Codes: H05K 2203/085 Using vacuum or low pressure
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence
• CPC Class Codes: H05K 3/321 by conductive adhesives
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor
• CPC Class Codes: Y10T 29/49171 with encapsulating

Abstract

Battery mounting apparatuses, electronic devices, and methods of forming electrical connections are described. In one implementation, a flexible circuit substrate has an area within which an electrical component, e.g. a thin-profile battery terminal housing member, is to be adhered. A conductive contact node pattern is disposed within the area and sized to be conductively adhered with the component. In one aspect, the conductive contact node pattern comprises an outer conductive node on the substrate at least a portion of which is positioned within the outermost 25% of the area. An electrical component is conductively bonded with the contact node pattern and encapsulating material is provided over and underneath the component. In a preferred aspect, the substrate and electrical component are vacuum processed sufficiently to redistribute the encapsulating material under the component. The positioning of the contact node pattern provides sufficient support during vacuum processing such that any tendency of the substrate to become lodged against the component is reduced, if not eliminated.

Claims

1. A method of forming a thin profile battery electrical connection comprising:

providing a thin-profile battery having a generally planar terminal housing member surface;

providing a substrate having an area within which the terminal housing member surface is to be conductively bonded, the area having a conductive contact node pattern therewithin which is sized to be conductively bonded with the housing member surface, the contact node pattern comprising;

a central node;

at least two inner nodes spaced outwardly from the central node and a pair of spokes conductively connected with and extending between respective inner nodes and the central node; and

at least two outer nodes conductively connected with the central node and positioned outwardly of the two inner nodes; and

bonding the terminal housing member surface with the contact node pattern.

2. The method of forming a thin profile battery electrical connection of claim 1 further comprising:

after the bonding, forming a flowable material over the battery and substrate;

placing the substrate in a vacuum processing chamber;

vacuum processing the substrate within the vacuum chamber sufficient to redistribute at least some of the flowable material intermediate the terminal housing member surface and the substrate; and

rendering the flowable material into a generally non-flowable state.

3. The method of forming a thin profile battery electrical connection of claim 2, wherein the vacuum processing comprises repetitively changing vacuum pressure within the chamber.

4. A method of forming an electrical connection between a thin-profile battery and a substrate comprising:

providing a thin-profile battery having a generally planar terminal housing member surface;

providing a substrate having an area within which at least a portion of the housing member surface is to be conductively bonded and outside of which no portion of the housing member surface is to be conductively bonded;

forming a plurality of conductive nodes over the substrate, at least some of the nodes being conductively connected with one another and positioned within an outermost 25% of the area within which the housing member surface portion is to be bonded;

conductively bonding the housing member surface with the plurality of conductive nodes by using at least three discrete adhesive masses which are formed at different radial distances relative to a center of the housing member surface;

forming a flowable material over the substrate and thin-profile battery; and

exposing the substrate to vacuum processing conditions effective to flow the flowable material under the battery.

5. The method of forming an electrical connection of claim 4 wherein the exposing of the substrate to vacuum processing conditions comprises:

placing the substrate in a processing chamber; and

establishing at least two separate vacuums at different times within the chamber sufficient to advance the amount of flowable material intermediate the housing member surface and the substrate.