JPH02121385A - Printed wiring board with built-in storage battery - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to printed wiring boards.

[Prior Art] Conventionally, a battery is sometimes used as a main power source or an auxiliary power source for memory backup of an electronic circuit using a printed wiring board on which low power consumption elements such as C-MOS ICs are mounted.

However, batteries have a large volume, which limits device miniaturization. In addition, a power circuit pattern for supplying power is required on the printed wiring, and since the power line is routed around the low power consumption element, the impedance of the element becomes high and noise gets on the power line. There was a problem that caused malfunction.

Therefore, the applicant of Utility Model Application No. 63-57435 has already proposed the use of a sheet-shaped storage battery as the base of a printed wiring board.

[Issue 8 to be solved by the invention] However, when a sheet-shaped storage battery is used as the base of a printed wiring board, the electrodes of the sheet-shaped storage battery are
Since the electrodes are located on the back side, forming the electrodes on the surface of the printed wiring board rather than the base is more complicated than manufacturing a printed wiring board having only through holes. Also, connect the electrodes to 2
If current is supplied to each semiconductor element on the printed circuit board via the circuit pattern on the wiring board, the problem of noise generation remains.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a printed wiring board that is small and has a built-in battery that generates less noise.

[Means for Solving the Problems] In order to achieve this object, the printed wiring board of the present invention has the following features:
A printed wiring board having a sheet storage battery as a base plate in which a cathode layer, a solid electrolyte layer, and an anode layer are formed in a laminated manner in this order has a battery positive terminal and a negative terminal formed as 11 through holes.

[Function] According to the printed wiring board according to the invention having the above configuration, the positive terminal and the negative terminal from the storage battery can be obtained from the same surface of the wiring board.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

First, the first part about the method of manufacturing a printed wiring board of the present invention.
This will be explained using figures. The structure of the sheet storage battery used in the present invention is that the anode is made of a composite material such as VB ot3,
The electrolyte is a solid polymer electrolyte, and the cathode material is Li or Li-AI metal foil. The composite anode is lined with Ni metal foil as a collector, making it possible to punch out a sheet-shaped storage battery and press it with thermocompression. Regarding the sheet-shaped storage battery, Utility Model Application No. 63-574
35, so no further discussion will be given here. In the first step of the manufacturing method, a spacer 101 made of phenol or epoxy leading edge material as shown in FIG. 1 and a perforated sheet battery 102 are combined as shown in FIG. 1.

Thereafter, as shown in FIG. 1, a copper foil 103 is crimped onto the upper side of the Ni metal foil 120 forming the anode current collector of the sheet battery. The sheet-shaped battery used here has an anode of Va01
The electrolyte 122 is a solid polymer electrolyte. Further, Ni foil is used as the current collector of the anode.

Next, the spacer 101 is polished to expose the cathode 123 made of Li foil or the like. Thereafter, as shown in FIG. 1, a copper foil 103 is pressed onto the polished surface. Next, as shown in FIG. 1, a copper foil 103 is patterned by a technique such as photolithography at a portion where a through hole is to be formed and a portion where a positive or negative electrode terminal is to be formed. Next, as shown in FIG. 1, a substrate 104 with prepreg coated on one side with copper is sandwiched.

As a result, the pattern portion 11 of the copper foil etched earlier
1 is filled with prepreg resin. Next, as shown in FIG. 1, a through hole is formed using an NC jig polar or an NC press. Here, 107 is a through hole, 105 is a negative electrode terminal, and 106 is a through hole to be formed as a positive electrode terminal.

Next, a copper coating is formed on the through-hole walls by electroless copper plating or electrolytic copper plating, as shown in FIG. 18. In this way, through hole 110. Negative terminal 108. A positive electrode terminal 109 can be formed. Furthermore, after this, a power supply to the element is applied to the copper foil 112 using a tenting method, a dry film method, etc.
Printed wiring boards can be manufactured by forming signal circuit pattern circuits.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to improve the degree of freedom in circuit design of a battery-incorporated printed wiring board that is small and generates little noise.

[Brief explanation of the drawing]

FIG. 1 is a manufacturing process diagram of a printed wiring board with a built-in storage battery according to the present invention. In the figure, 108 is a negative terminal hole, 109 is a positive terminal hole, 11
0 is a through hole.

Claims (1)

[Claims] In a printed wiring board based on a sheet storage battery in which an anode layer, a solid electrolyte layer, and a cathode layer are sequentially formed in a laminated manner within a printed circuit board main body, a positive terminal hole connected to the anode layer and a cathode layer connected to the cathode layer. A printed wiring board with a built-in storage battery, characterized in that negative electrode terminal holes are formed on the main body surface of the printed circuit board.