THIN-FILM BATTERY EQUIPMENT
BACKGROUND OF THE APPLICATION  1. Field of the Application
 The present application relates to equipment that incorporates electronic devices that utilize battery power.
 2. Description of the Related Art
 An electronic device is a machine that performs work using power supplied, at least in part, in the form of the flow of electrons. A battery is a device that consists of one or more cells (a cell is a device that converts a store of chemical energy into electrical energy) that are connected to act as a source of electric power. A rechargeable battery is a device whose one or more cells can be substantially reenergized once the store of chemical energy in the rechargeable battery has been partially or completely depleted.
 An electronic device which utilizes battery power is one in which the electronic power supplied to the device comes at least in part from a battery. One type of electronic device that utilizes battery power is an integrated circuit, such as a memory circuit, a DC-DC converter, or a processor.
 A variety of equipment incorporates electronic devices that utilize batteries. Examples of such equipment are portable computers, portable computer peripherals, personal digital assistants (PDAs), cellular phones, and cameras.
BRIEF DESCRIPTION OF THE SEVERAL
VIEWS OF THE DRAWINGS
 FIG. 1 shows a side-plan view of apparatus 100.
 FIG. 2 shows an illustrative example of thin-film battery 102 used in one embodiment of the present invention.
 FIG. 3 shows one implementation of surface 104 in one embodiment of the present invention.
 FIG. 4 depicts a side-plan view of a structure that may be used to create an implementation of surface 104 using substrate 108.
 FIGS. 5A-5C illustrate side-plan views of structures representative of a method for constructing, at a substantially high temperature, a device having a thin-film battery.
 The use of the same symbols in different drawings typically indicates similar or identical items.
DETAILED DESCRIPTION OF THE
 FIG. 1 shows a side-plan view of apparatus 100. Apparatus 100 has incorporated within it an integrated circuit and battery unit 105. The circuit unit 105 includes a thin-film battery 102 affixed to surface 104 and an integrated circuit 106 overlying the battery 102.
 In a typical embodiment of the present invention, apparatus 100 is an electronic system that has circuitry in need of battery-supplied electric power, such as a wireless system or a computer system. Examples of such wireless
systems include but are not limited to wireless phones, wireless handheld computers, wireless modems, wireless email units, and wireless Global Positioning System locators. Examples of such computer systems include but are not limited to handheld computer systems, personal computer systems, workstation computer systems, minicomputer systems, and mainframe computer systems.
 In many embodiments, the apparatus 100 is of a type that requires extremely low power for operation or low power for retention of data. Typically, the battery 102 provides 5 volts, or alternatively 3.6 volts, depending on the application and integrated circuit used. The integrated circuit may be of the type used in a smart card which has very low power requirements for data retention. The battery 102 may thus be the power supply for the smart card or ensure that data is retained in the smart card. The integrated circuit may include a clock circuit and a clock time retention circuit to maintain accurate time when all other power supplies are removed. The apparatus may also be of a low power memory type, such as an SRAM, a TAG RAM or some other data storage device which is desired to remain programmable but have local battery power capability. In many applications, such as a wireless phone, a modem, a GPS system or the like, the battery 102 will be a backup battery for maintaining system operation or storage of data for brief periods of time in the event main power supply fails. The battery 102 may be used in combination with other power supply systems if the apparatus 100 is of the type which consumes large amounts of power and is connected to main line power and has one or more main battery power supplies and battery 102 is a third level backup power supply or alternative power supply.
 In some combinations, the battery 102 is the primary power supply, such as in a smart card, and may, in some instances, be the sole source of battery storage. It may potentially be the sole source of electrical power during certain times of operation of the integrated circuit 106 and of the apparatus 100. The battery 102 may be charged during normal operation of the device and then be used to power only certain components at selected times within the overall system 100, such as the integrated circuit 106 while other portions of the circuit obtain their power from different sources.
 In a typical embodiment of the present invention, surface 104 is a surface formed from one or more structures used in a semiconductor product. Examples of such surfaces include but are not limited to surfaces of semiconductor package substrates, surfaces of semiconductor substrates, surfaces of integrated circuit packages, and surfaces formed as a combination of other surfaces. For example, FIG. 1 shows surface 104 as a non-flat surface made up of a conductive trace 112 and dielectric layers 114 and 115. In addition, in various other embodiments of the present invention surface 104 may be a flexible, rigid, flat, or irregular surface.
 Continuing to refer to FIG. 1, device 106 is affixed to thin-film battery 102 via coating 116. In some embodiments of the present invention, device 106 is an integrated circuit, and in such embodiments the substrate that supports the integrated circuit is affixed to thin-film battery 102. In other embodiments of the present invention, device 106 is other of various electrical circuit elements well known to