DE10252308B3 - Semi-finished product for making circuit board, has battery or accumulator element with temperature- and pressure-resistance matching manufacturing parameters fixed in opening in no-conductor region - Google Patents

Abstract

The device is made of a flat insulating material, especially plastic, and has at least one opening (2) in a region of at least one insulating intermediate layer with upper and lower conductor patterns (6) in which there are no conductors. The opening matches the profile of a flat battery or accumulator element (3) whose thickness is not greater than that of the semi-finished product. A battery or accumulator element with temperature- and pressure-resistance matching the manufacturing parameters can be fixed (5) in the opening. AN Independent claim is also included for a single- or double-sided circuit board made from an inventive device.

Description

The invention relates generally the technical field of printed circuit boards which are single-sided or double-sided or are provided with conductor patterns in intermediate layers and which be connected to a voltage source and / or a current source, around those provided on the printed circuit board or in the printed circuit board To supply circuits with electrical energy.

It is well known, especially mobile electronic devices with batteries or rechargeable batteries housed in an interchangeable compartment to provide the central supply of all electronic Show circuit of the relevant mobile device.

The replaceable batteries or Batteries have considerable Space requirements and that for the interchangeable subject to be provided limits the ones available for the designer Dimensions of the in the device provided circuit boards or circuit board. The supply lines for the electrical Energy from the batteries or accumulators to the circuit parts of the Printed circuit boards take up considerable conductor pattern area on the latter.

Become current sources or voltage sources in the usual Way mounted on the circuit boards, so it is difficult Printed circuit boards with current sources or voltage sources arranged one above the other to stack because of the dimensions of the current source or voltage source distances between stacked circuit boards not reduced below a certain level can be.

From the DE 196 27 543 A1 A multilayer substrate is known in which conductor tracks are formed within a structure of adjacent insulating layers and an inner insulating layer of the substrate is designed as a spacer frame with window cutouts, an electrical component in the area of the window cutout on conductor tracks in the plane between the spacer frame and the adjacent insulating layer is applied. The window cutout and the component housed in it are covered by another insulating layer.

From U.S. Patent 5018051 it is known to use a multilayer printed circuit board to produce an insulating intermediate layer in which cutouts for holding electronic components or thin DC batteries are provided. The cutouts or recesses of the insulating Interlayer have a thickness that matches the thickness of the used is adapted to electronic components or battery elements, so this in which cutouts are embedded. Over the insulating intermediate layer and over the electronic components or battery elements embedded in it are then further insulation layers in the known circuit board and again arranged on this arranged conductor pattern, whereby these conductor patterns in mutually perpendicular coordinate directions run and over Vias with the connections of the electronic components or the battery elements are connected. In marginal areas of the known circuit board is the insulating intermediate layer with a Terminal contact row provided, the thickness of the total thickness of the further insulating layers equivalent.

It is an object of the present invention To create semi-product circuit board, by means of which the one PCB with associated power supply and power supply volume designed extremely flat can be made using the method indicated manufactured semi-finished circuit boards even flatter and more manageable Assemblies can be built than is possible with known circuit board designs.

This object is achieved by a Method with the features of claim 1 solved.

Advantageous configurations and Develop further developments of the ideas defined in this claim Subject of the subordinate claims.

A discussion of exemplary embodiments Given the following general considerations: The invention builds on the realization that thin film lithium batteries are currently and thin film lithium ion batteries as well as other types of extremely flat batteries and Batteries available stand to such an extent They are temperature-resistant and pressure-resistant if they are selected accordingly the parameter for the production of printed circuit boards the temperatures that occur and press resist what makes it possible will integrate such battery or accumulator elements in printed circuit boards, such that they not about that Outline a circuit board so that a circuit board with it assigned current and / or voltage sources created in one form can be different from a conventional circuit board distinguishes which latter about separately provided conductor paths with a current and / or voltage source must be connected.

With a comparatively simple manufacture of a semi-finished printed circuit board in the manner specified here, the circuitry and assembly outlay are additionally simplified because the semi-finished printed circuit board is a single-storey unit during further processing to form a multilayer printed circuit board is manageable. The areas available for the line pattern on the semifinished printed circuit board are considerably enlarged and their spacing can be considerably reduced when several printed circuit boards are stacked in those cases in which a certain minimum distance had to be maintained up to now due to intervening battery or battery elements.

The concept proposed here enables within a circuit pattern provided on or in a printed circuit board specific circuit areas each have separate current and / or voltage sources assigned. Is it the current and / or voltage sources to rechargeable items, these can be used as needed can be recharged using a specific charging program. Within A circuit board can have several Current and / or voltage sources of different voltage levels be provided, which in certain cases the entire circuit structure advantageously influenced.

Then when the manufacturing process for one Semi-product circuit board of the type specified here is selected so that for connection their layers or layers only moderate temperatures and pressures for curing of the synthetic resin used can of course be used accordingly Battery elements in the intermediate layer or in the cutouts provided in the interlayers and therein be embedded, the lower resilience across from increased Temperatures and elevated To press to have.

It should be noted here that the use of Battery elements in sections of an intermediate layer or of intermediate layers of the printed circuit board according to another embodiment in from the side edges accessible to the circuit board Cut-outs made after the manufacture of the circuit board can be if for such a lateral insertion of the battery or Battery element or the relevant battery or battery elements corresponding Has or has inherent rigidity.

Further advantages and configurations of the method specified here result from the following Description of exemplary embodiments with reference to the drawing. In this represent:

1 an embodiment of a semi-finished product for building up a printed circuit board, the semi-finished product being provided with conductor patterns on one or both sides; and

2 an exploded view of a circuit board with several, each having conductor patterns intermediate layers, which are provided with aligned cutouts for receiving an inserted battery or battery element.

1 shows a flat, made of filler or fiber material with plastic material 1 , which serves as a semi-finished product for the construction of a printed circuit board. The plate material 1 is with rectangular cutouts 2 provided, which are within the surface area of the plate material 1 located. According to a modified embodiment, a section can be 2 however also to a peripheral edge of the plate material 1 open up. The cutouts 2 can by cutting or punching, but preferably by milling in the plate material 1 be educated.

In the respective section 2 is a battery or accumulator element adapted to its contours 3 used, from the opposite side edges terminal lugs 4 stick out on the top of the battery or battery element 3 in the out 1 evidently bent.

The thickness of the battery or battery element 3 is equal to, or preferably slightly less than, the thickness of the plate material 1 ,

With fixative 5 that are between the inner border of the cutouts 2 and the outer border of the respective battery or battery element 3 the battery element is in the cutout 2 of the plate material 1 recorded.

The fasteners 5 can be formed by adhesive or can by doctoring a curable synthetic resin onto the plate material filling the gaps between the inner cutout and the outer edge of the battery or accumulator unit 3 and subsequently cured.

One form of a semi-finished product of the type specified here provides that the fastening means 5 through into the spaces between the inner edge of the cutout 2 and the outer edge of the battery or battery element 3 introduced plastic is formed, which penetrates from prepreg sheets into these spaces when these prepreg sheets on both sides of the plate material after insertion of the battery or battery element 3 in the neckline 2 and after pressing conductor tracks on the upper and lower prepreg track together with the layers in between are pressed and cured at elevated temperature.

It should be noted at this point that under a prepreg sheet generally one with a not yet hardened synthetic resin impregnated nonwoven web is to be understood.

In the embodiment of the semi-finished product 1 the plate material is not a neutral, electrically insulating plastic, at least containing plate alone, but a plate that has previously been known in a manner known per se on the top and / or bottom with conductor patterns 6 and 7 verse hen. The process steps required for this are known to the person skilled in the art. This plate material 1 according to 1 is carried out, as already stated, in those areas by the conductor pattern 6 and 7 are free, for example with rectangular cutouts 2 provided, and in the cutouts 2 are each the shape of the cutouts 2 adapted or respectively adapted battery or battery elements 3 used and by the fixative mentioned 5 fixed.

It is advantageous in the embodiment according to 1 that within the outline of one the plate material 1 intermediate layer forming several cutouts 2 can be provided in the battery or accumulator elements 3 are used, which can be assigned to individual circuit parts of the printed circuit boards constructed using the semifinished product, and which can also have different storage capacities for electrical energy or different voltage levels, as a result of which the circuit structure of the printed circuit boards to be produced can change considerably and can also be simplified.

While in the embodiment after 1 of a one-piece or single-layer plate material 1 it is assumed that this plate material can also be composed of several semifinished sub-layers, these sub-layers each with aligned cutouts 2 are provided, and wherein the semifinished sub-layers have an overall thickness which is equal to, or preferably slightly larger than, the thickness of the battery or battery elements inserted into the cutouts.

According to a modification of the semi-finished product, not shown in the drawing 1 can use the fixative 5 can also be realized in such a way that the connections 4 the battery or accumulator elements 3 are not bent over onto the top of these elements, but rather project to the side lying essentially in the plane of this top and are connected to the conductor pattern parts on the relevant top of the plate material, in such a way that after laying prepreg sheets on top and bottom of the relevant semi-finished product then the contact areas to the connections 4 be secured and also the spaces between the inner edges of the cutouts 2 and the outer edge of the battery or battery elements are fulfilled by the resin of the prepreg sheets after pressing a layer structure at elevated temperature, and thus the respective battery or battery elements are then fully embedded as an integral part of the relevant semi-finished product.

2 shows an exploded view of a multilayer printed circuit board constructed according to the concept proposed here. This contains plates made of an electrically insulating material, in particular with filler or plastic mixed with fibers 1 as intermediate layers, with cutouts aligned in the vertical direction 2 are provided. In addition, the intermediate layers have conductor patterns on one or both sides 6 , which previously consist of conductor foil laminations, in particular copper foil coverings, of the plates 1 have been generated by methods known to those skilled in the art. The cutouts 2 are located in those surface areas of the plates 1 which are not of the ladder pattern 6 to be taken. The total thickness of the panels used as interlayers 1 is slightly larger than the thickness of one of the shape of the cutouts 2 adapted battery or accumulator element 3 which is in the stacked arrangement of the plates 1 in the area of their clippings 2 Takes place.

Over the layer structure with the plates 1 there is an upper circuit board 8th , and under which the plates 1 containing layer structure is a lower circuit board 9 ,

When manufacturing the multilayer circuit board after 2 becomes the stack from the lower circuit board 9 , the lower plate 1 , the top plate 1 and the upper circuit board 8th each with the interposition of prepreg sheets 10 . 10a and 10 in the cavity according to the superimposed cutouts 2 inserted battery or accumulator element 3 pressed and cured such that the battery element 3 finally, as previously described, in the cutouts 2 defined cavity is embedded and finally a structural unit comprising the layer structure is created. It should be noted here that on top of the circuit board 8th and the underside of the circuit board 9 in this manufacturing process it is not necessary to form conductor patterns, but that in this manufacturing state on the underside of the circuit board 9 and on top of the circuit board 8th self-contained conductor tracks or conductor coverings, in particular copper coverings, from which conductor patterns, for example the conductor patterns, can only be provided in subsequent manufacturing processes 11 and 12 on the top of the circuit board 8th , are produced by photolithographic processes or etching processes in the manner known to the person skilled in the art.

The ladder pattern 11 and 12 for example on the top of the circuit board 8th can also extend into those areas under which the embedded battery or accumulator element 3 located so that its embedding in through the plates 1 Intermediate layers formed for circuit patterns on the surface of the circuit board 8th and the underside of the circuit board 9 in no way limits available space.

It should be noted here that of course the intermediate between the two layers forming plates 1 inserted prepreg sheet 10a In contrast to the prepreg sheets above and below, it must be provided with a cutout that matches the cutouts 2 of the plates 1 is aligned with the battery element 3 to be able to use without interference.

Compared to previously indicated embodiments, in which a flat battery element in the edge of a plate material 1 open cutouts 2 can be inserted or inserted, the embodiments described here have within the surface area of the plate material 1 Cutouts located therein and inserted or inserted from above battery or battery elements the advantage that extremely thin battery or battery elements can be used here, with always reliable contact to the adjacent conductor pattern is achieved.

The latter preferred embodiments primarily see a permanent, part of the manufacturing process Forming contact between the battery or battery elements and the ladder pattern.

Printed circuit boards of the specified here Kind can either the exclusive Power supply to the circuits provided on them, if necessary serve at different voltage and / or current levels or can also serve as data backup in the event of a power failure.

Finally, it should be noted that in Within the scope of the description of embodiments given here, combinations of features of any kind Kind of features of different embodiments as disclosed are to be considered.

Claims (5)

Process for producing a semi-finished printed circuit board for the construction of a printed circuit board provided on one or both sides and in intermediate layers with a conductive pattern, which is to be connected to a voltage source and / or current source, with the following process steps: an electrically insulating material, in particular plastic with or without filler or fiber reinforcement , at least containing intermediate layer ( 1 ) is provided which carries a conductor pattern on the top and / or bottom; this intermediate layer ( 1 ) in areas free of conductor patterns with at least one recess or cutout ( 2 ), which or which to the respective outlines of a flat battery or battery element ( 3 ) is adapted, the thickness of the flat battery element being no greater than the thickness of the at least one intermediate layer ( 1 ) is selected; the flat battery or battery element is cut into a respective cutout or recess ( 2 ) used; the flat battery or battery element ( 3 ) is fixed by fixative ( 5 ) in the respective cutout or recess ( 2 ) the at least one intermediate layer ( 1 ) fixed; from below and from above, at least one intermediate layer ( 1 ) with the respectively in the recess or the cutout or the recesses and the cutouts ( 2 ) used battery or accumulator element ( 3 ) Prepreg tracks created, and on these in turn printed conductor sheets placed on the outside; the layer structure is then pressed at elevated temperature and pressure and the prepreg sheets are brought to harden, the synthetic resin of the prepreg sheets being placed in the spaces between the inner edges of the respective recesses or cutouts ( 2 ) on the one hand, and the outer edge of the associated battery or battery elements ( 3 ) penetrates on the other hand, hardens there and the respective battery or accumulator element ( 3 ) in the through the associated cutout or recess ( 2 ) embedded space. A method according to claim 1, characterized in that the intermediate layer ( 1 ) from several semi-finished sub-layers ( 1 ) is built up, with cutouts provided in the sublayers ( 2 ) are aligned. Method according to claim 1 or 2, characterized in that the battery or accumulator element in the respectively associated cutout ( 2 ) is stuck. A method according to claim 1 or 2, characterized in that the battery or accumulator element in the associated cutout ( 2 ) via its connections ( 4 ) is fixed, which are connected to conductor patterns on the top or the bottom of the relevant intermediate layer. Method according to one of Claims 1 to 4, characterized in that conductor patterns ( 11 . 12 ) are formed, which are also located in those printed circuit board surface areas below which there is an embedded or a battery or battery element ( 3 ) is located, and that finally a connection between conductor patterns of the printed circuit board and connecting lugs of the respective battery or battery element is produced by means of plated-through holes which are metallized.