EP3422807A1 - Cooking plate - Google Patents

Abstract

A hotplate has a hotplate body having a flat top surface and a bottom surface on which at least one heating element having two free ends is provided, the at least one heating element being completely embedded in and surrounded by a holding mass at the bottom surface. For electrical connection of the cooking plate, an electrical connection device is provided on the underside, which has connection means which are arranged on or in the connection device. The connection device is connected via the connection means in an electrically conductive manner to the at least one heating element, wherein from each free end of a heating element, a one-piece and continuous metallic connecting wire goes directly to a connection means.

Description

Field of application and state of the art

The invention relates to a cooking plate with a cooking plate body and at least one heating element on its underside, which is connected by means of a connection device with the heating element.

Hotplates of the aforementioned type have been used for decades for electric cooking. Corresponding hotplates are known for example from the CH 74 105 B , of the CH 187 383 B , of the DE 908 646 C or the DE 33 36 311 A1 , Usually heating elements in the form of round coiled heating wires in a holding mass or potting compound are laid on an underside of a hotplate body, in particular substantially in a spiral shape or along concentric circles. In free ends of the heating wires connecting wires are inserted and welded, which can stand out of the holding mass. Connecting wires are welded to protruding from the holding mass ends of the connecting wires, which in turn are then guided to an electrical connection device which is arranged on the underside of the cooking plate. This represents a considerable effort.

Task and solution

The invention has for its object to provide an aforementioned hotplate, can be avoided with the problems of the prior art and in particular it is possible to make the electrical connection of the heating element of the hotplate easier with less material and higher safety during manufacture and operation ,

This object is achieved by a cooking plate with the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

The hotplate has a hotplate body having a top and a bottom. The upper side is formed substantially flat, under certain circumstances, a slight depression is provided in a central or central region of the upper side. However, this does not change the fact that the upper side is substantially flat. On the underside of the hotplate body at least one heating element is provided, which is elongated and after a laid certain laying pattern. Advantageously, the at least one heating element covers a substantial or a large part of the area of the underside, particularly advantageously more than 50%. A central area and an outer area can remain free. The at least one heating element has two free ends or each heating element of the cooking plate has two free ends.

Such a heating element is completely embedded in an aforementioned holding mass or potting compound on the underside and is completely surrounded by this. This holding composition may be ceramic and hardened or fired therein after embedding the heating element, depending on the material used. This type of installation and attachment of a heating element on the underside of a cooking plate is known, as well as such a holding mass itself, so that nothing further has to be carried out for this purpose. The embedding of the heating element in the holding mass and complete wrapping is important to protect it from oxidation and thus damage or destruction. At the same time, of course, an electrical connection is made more difficult.

For such an electrical connection of the cooking plate to the outside, for example in a stove or a hob, an electrical connection device is arranged on the underside. This has connection means which are arranged on or in the connection device. They are also attached to or in the connection device, in particular in a connection body made of electrically insulating material. Such a connection device is advantageously designed as known from the prior art, wherein the connection means advantageously have or can be plug connections, screw connections or a so-called strand connection. This connection device is electrically conductively connected to the at least one heating element, so that the cooking plate is electrically wired as a unit by means of the connection device to the inside, so to speak, and can be connected to the outside.

According to the invention, from each free end of the at least one heating element and / or each heating element, a one-piece and continuous metallic connecting wire goes directly to the connection device or directly to a connection means of the connection device. Thus, on the one hand, the number of mechanical and electrical connections for the electrical connection can be reduced. On the other hand, the susceptibility to failure of bad electrical connections can be reduced.

Advantageously, the cooking plate has only a single connection device. Such a connection device may be formed as a separate unit, advantageously just with an aforementioned Connection body on or in which the connection means, in particular as outwardly projecting screw terminals, as plug-in terminal lugs or as plug-in connections, are arranged and fixed. The connection device can then have as many individual connections or connection means as are necessary for the interconnection.

The metallic connecting wires are then also at least partially embedded in the holding mass and are thus fixed. Thus, they can also serve at least partially to fasten the connection device. A diameter of such a connecting wire may be between 0.3 mm and 2 mm, advantageously about 1.3 mm. It is advantageously made of stainless steel, for example a stainless steel 1.43.01 with a CrNi alloy.

In an advantageous embodiment of the invention exactly one single connecting wire is provided at each free end of the at least one heating element, which is connected thereto. These are therefore used exclusively for their electrical connection.

It is possible to connect at least one connecting wire to another connecting wire, either at another free end or in a central region of the connecting wire. This can be a direct connection, one of the connecting wires is then applied directly to another and connected to it. However, a further interconnection wire is advantageously provided, which connects the connecting wires together as a kind of separate bridge. Such a connection between two connecting wires is advantageously outside the holding mass and is thus easily accessible even after introduction of the holding mass, so that it can also be produced subsequently. Then the introduction of the holding mass is easier. Thus, it is possible under certain circumstances, if a hotplate has a plurality of heating elements, they interconnect internally, so to speak.

In an advantageous embodiment of the invention stand out of the holding mass exclusively connecting wires, which are guided to connection means of the connection device, and no heating wires or heating elements or other connecting wires, which are connected directly to a heating element. Then just all protruding wires are guided as connecting wires to connecting means of the connection device.

In an alternative embodiment of the invention, the above-mentioned possible connections or connecting points between two connecting wires can lie outside the holding mass with each other and be easily accessible. But then one of the protruding connecting wires is not guided to a connection means of the connection device.

In yet another alternative embodiment of the invention, two connecting wires may be led to the same connection means of the connection device, for example, if the connection means on the one hand has a metallic plug connection lug for attaching a mating connector to the connection device and on the other hand, a connection portion which protrudes from the connection body and to which a single connection wire or also two connecting wires are electrically and mechanically fixed. This is preferably done by welding. Such attachment is mechanically safe and durable and good electrical conductivity. Alternatively, screw connections or jamming could be provided.

In a particularly advantageous embodiment of the invention, just as many connecting wires protrude from the holding mass as connection means are provided on the connection device or as plug-in connections or plug-in connection lugs are provided on the connection device. In each case exactly one single connection wire is connected to exactly one single connection means. This means that a possible connection of several heating elements with each other as a kind of interconnection is outside the holding mass, which is to take place within the cooking plate, so not only outside and thus behind the connection device.

An embodiment of the at least one heating element advantageously takes place with a coiled heating wire, which can thus form the heating element. Such a heating wire is advantageously coiled around, as is known per se from the prior art. A diameter may be in the aforementioned range of the thickness of the connecting wire for a precisely fitting connection.

Advantageously, a connecting wire with a free end in a round coiled heating wire at the free end used for connection. Then he is attached to it, advantageously welded or dotted. It is particularly advantageous that the heating wire always runs in a single plane and thus approximately parallel to the top of the hotplate. A bending of the electrical connection to the connection device is then carried out by a corresponding angled or bent connecting wire, preferably angled by about 90 °, so that the connecting wire protrudes approximately at right angles from the underside of the cooking plate. For a previously mentioned screw connection or a stranded connection, a further, additional bending by 90 ° can also be provided so that the connection wire again runs approximately parallel to the underside of the cooking plate.

A solid connecting wire is advantageous over a wire strand or the like. considered, since it has a much greater dimensional stability with a higher positional accuracy after pouring or embedding in the holding mass.

In a preferred embodiment of the invention it is provided that the two free ends of a heating element are arranged close to each other. In particular, they can have a distance from each other which is less than the maximum width of the connection device or the maximum distance from electrical connections of the connection device. This makes it possible that the connecting wires are relatively short and have to bridge only a distance between the free ends of the heating elements and the connecting means or the aforementioned connection means of the connecting device, which corresponds approximately to the distance between the plane of the heating element and the connection means with a direction perpendicular to said plane. Preferably, such a distance of the free ends of a heating element can be at most 10 cm, in particular at most 3 cm or 5 cm. Thus, it is possible that a maximum long heating element or a maximum long heating wire of this heating element is installed in the cooking plate and thus a maximum large surface portion of the cooking plate is heated by the heating element. Furthermore, so the connecting wires can be kept relatively short.

In general, the length of the connecting wires can be chosen relatively short, advantageously max. 10 cm long, especially advantageous max. 5 cm. Thus, the structure can be simplified and the connecting wires are not distracting.

It can be provided that at least two heating elements are provided in the cooking plate, possibly even a total of three heating elements. These heating elements should preferably each extend in concentric circles to each other. A distance between the respective circles is advantageously approximately the same, particularly advantageously exactly the same. Each heating element should have at least two revolutions or run along two circles. It is considered preferable if the heating elements do not overlap or do not cross over. On the one hand, this could be problematic with regard to possible electrical separation, on the other hand, an undesired heat concentration could arise in the crossover region. Thus, the circulating turns or turns of each heating element are advantageously juxtaposed, and each heating element forms its own annular region in which no other heating elements of appreciable length extend, at most possibly along a strip-shaped connection region, which can extend in particular in the radial direction. By such a division can be achieved that, depending on the respective area performance, in turn, on the performance of the individual heating elements depends, in a radially inner region is a different area performance than in a radially outer region. Thus, heating power generation may possibly be optimized. Furthermore, it can be provided that not all annular surface areas of the cooking plate are heated at all or similar by an external electrical interconnection, for example by means of a mode selector switch.

In a further embodiment of the invention can be provided that in the event that at least two or even three heating elements are provided, the free ends also have a total of relatively small distance from each other. Thus, it can be advantageously provided that a distance of all free ends is a maximum of 7 cm to each other, preferably a maximum of 5 cm, so that the farthest free ends are at most 7 cm or 5 cm apart. Alternatively, this distance can amount to a maximum of 25% of a diameter of the hotplate, more preferably at most 15%. This can be achieved if all the free ends of all heating elements lie in an aforementioned strip-shaped connection region, which extends in the radial direction. If the heating elements each have at least two revolutions along concentric circular rings, then the free ends of the radially outermost heating element should lie on its radially innermost annulus. The radially innermost heating element should be exactly the other way round, where the free ends should lie on the radially outermost annulus.

Alternatively it can be provided, if at least two heating elements are present, that the free ends of a heating element, preferably of the radially inner, are pulled slightly radially outwardly from its annulus on the innermost annulus of a radially outer heating element. There they can lie between its free ends or lie with them on a line, advantageously with the aforementioned small distance from each other.

As has been mentioned above, the connection means of the connection device advantageously have a metallic plug connection lug which protrudes from the connection device or protrudes from it, preferably radially outward. They can be designed for a plug-in direction parallel to the top of the cooking plate. From the plug connection lug is advantageous from a connection portion, preferably in the opposite direction to the insertion direction, which protrudes on another side of the connection body from this, advantageously from an opposite side. At this connection portion, a connecting wire in the manner described above, be electrically and mechanically fixed, in particular welded.

A connection device can have a connection body, which consists of electrically insulating material. This is advantageously a correspondingly known ceramic, for example steatite. The connection body is advantageously attached to a rear-side cover of the hotplate body and / or fixed, wherein such a cover is advantageously a kind of sheet metal plate. This closes the hob down or spans the underside.

For the connecting wires electrically insulating bushings may be provided by an aforementioned cover. These are particularly preferably made of ceramic, wherein preferably a single passage member is provided for all the connecting wires of a cooking plate, which protrude from the holding mass and which are guided to the connection device. Although this lead-through part can also be inserted from the outside through the cover. Advantageously, however, it is inserted from the inside through the cover and can thus be arranged largely within the cooking plate or below the cover. Thus, it may be advantageous with more than 70% of its body or its volume below the cover and survive over the cover. Said connection body of the connection device can be provided near this passage part, in particular it can, so to speak, bear against it or be supported against it.

These and other features will become apparent from the claims but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Fig. 1

eine schräge Teilschnittdarstellung einer ersten Ausgestaltung einer erfindungsgemäßen Kochplatte,

Fig. 2

eine Abwandlung der Kochplatte aus Fig. 1 in einer zweiten Ausgestaltung der Erfindung,

Fig. 3

eine Schnittdarstellung durch eine Verlegung von Heizdrähten eines Heizelements samt Verbindungsdraht gemäß einer Ausgestaltung der Erfindung,

Fig. 4

eine schematisierte Darstellung eines Anschlusses eines abgewinkelten Verbindungsdrahts an einen Heizdraht ähnlich Fig. 3,

Fig. 5

eine Abwandlung der Darstellung der Fig. 4 mit zwei Heizdrähten, wobei ein Heizdraht mit einem nach oben abgewinkelten Verbindungsdraht versehen ist und der andere Heizdraht mit einem mit dem ersten Verbindungsdraht verbundenen Verbindungsdraht,

Fig. 6

eine schematisierte Unteransicht eines Verlegemusters einer erfindungsgemäßen Kochplatte mit einem einzigen Heizelement,

Fig. 7

eine weitere erfindungsgemäße Kochplatte mit zwei separaten Heizelementen und

Fig. 8

eine weitere erfindungsgemäße Kochplatte mit drei Heizelementen, deren freie Enden möglichst nahe beieinander angeordnet sind.

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:

Fig. 1

3 is an oblique partial sectional view of a first embodiment of a cooking plate according to the invention,

Fig. 2

a modification of the hotplate Fig. 1 in a second embodiment of the invention,

Fig. 3

a sectional view through a laying of heating wires of a heating element together with connecting wire according to an embodiment of the invention,

Fig. 4

a schematic representation of a connection of an angled connecting wire to a heating wire similar Fig. 3 .

Fig. 5

a modification of the representation of Fig. 4 with two heating wires, wherein one heating wire is provided with an upwardly angled connecting wire and the other heating wire is provided with a connecting wire connected to the first connecting wire,

Fig. 6

6 is a schematic bottom view of a laying pattern of a cooking plate according to the invention with a single heating element,

Fig. 7

another cooking plate according to the invention with two separate heating elements and

Fig. 8

a further cooking plate according to the invention with three heating elements whose free ends are arranged as close to each other as possible.

Detailed description of the embodiments

In the Fig. 1 is a sectional oblique view of a section of a cooking plate 11 according to the invention shown as a single-circuit hotplate. The cooking plate 11 has a hotplate body 13, advantageously consisting of conventional cast material. The hotplate body 13 has a substantially flat upper surface 14 with a central central recess. This entire top 14 is formed according to the prior art.

A bottom 16 of the hotplate 11 and the hotplate body 13 is shown here as a kind of plane what they, as after the Fig. 3 shows, but does not have to be exact. Outside at the bottom 16, a circumferential protruding edge elevation 17 is provided, which is also known from the prior art.

As will be explained in more detail below, stand out from the bottom 16 two connecting wires 26a and 26b and extend substantially vertically to the top 14. They partially pass through a feedthrough 30, advantageously consisting of ceramic or steatite, which corresponding through holes 31st having. This passage member 30 is disposed below a cover plate 32 of the cooking plate 11 and is above over this. With its lower portion, the grommet 30 is located on the bottom 16.

The vertical angle portions 28a and 28b of the connecting wires 26a and 26b are connected to terminal portions 37a and 37b of terminal means, advantageously welded thereto. These connection sections 37a and 37b are in turn supported in a connection body 36. Like from the Fig. 2 can be seen, go the connection sections 37a and 37b forward in here not to be recognized plug connection lugs. With these, the cooking plate 11 can be electrically connected in a known manner.

In the modification of a further cooking plate 111 according to the invention as a multi-circuit cooking plate according to Fig. 2 protrude from the bottom 116 of the hotplate body 113 with a turn largely flat top 114 four connecting wires 126a to 126d out. Of the rightmost connecting wire 126d, only the upper vertical angle portion 128d is seen, which is adjacent to the other vertical angle portions 128a to 128c. These vertical angle portions 128a to 128d are welded to respective terminal portions 137a to 137d as previously explained. These connection sections 137a to 137d each forward into plug-in lugs, in which case only the plug connection lug 139d can be seen. Thus, while the cooking plate 11 has only two electrical connections to the single connection device 35 to the outside, the cooking plate 111 on the single connection device 135 on four electrical connections. It can therefore, as will be explained in detail below, have more than a single heating element, in particular two or three.

In the Fig. 3 is a schematic section through the cooking plate 11 and the hotplate body 13 shown, directly from the side. The hotplate body 13 has on its underside 16 a structure with protruding ribs 18 which form between them wide grooves 19. The thickness or width of the ribs 18 and / or the grooves 19 is advantageously equal, but may also vary under certain circumstances. Within the grooves 19 extend, advantageously relatively centrally, heating wires 21 of a heating element 22. They can run according to a specific laying pattern, as in the following Fig. 6 to 8 still show. The grooves 19 are largely filled with holding mass 24, which can go to the upper edges of the ribs 18, alternatively, this cover or even slightly below it. The laying of the heating wires 21 in the holding mass 24 is carried out according to the prior art and need not be explained in detail here.

Outgoing from a heating wire 21 in the middle of a connecting wire 26 with a vertical angle section 28 is above. The vertical angle section 28 is even higher than the edge elevation 17 and, like the Fig. 1 shows welded to a terminal portion 37. For the sake of simplicity, neither cover plate 32 nor feedthrough part 30 or connecting device 35 are shown here.

Details of the electrical connection are in the Fig. 4 showing how a heating wire 21 of a heating element 22 is electrically connected by means of a single connecting wire 26. In this case, a lower angle section 27 of the connecting wire 26 is inserted into a free end 23 of the heating wire 21 and welded thereto. The connecting wire may be an initially described with a corresponding diameter, the exact and so to speak can be suitably inserted into the free end 23 of the coiled heating wire 21 and welded to it.

The right angle bent upward vertical angle portion 28 is above the holding mass 24 via. From the Fig. 4 It can be clearly seen that the connection between heating wire 21 or heating element 22 and connecting wire 26 lies within the holding mass 24. Thus, it is better protected against oxidation or corrosion, furthermore, so no mechanical stresses on this electrical and mechanical connection can come so when finishing the hotplate 11 including installation of the connection means 35. From the Fig. 4 It can also be seen that therefore a single part is provided between the heating wire 21 of the heating element 22 on the one hand and the connection portion 37 on the other hand, according to Fig. 1 is mounted in the connection device 35 and has at its other end a plug connection lug.

From the Fig. 5 For example, an alternative electrical connection is shown for two heating elements 22a 'and 22b' each having a heating wire 21a 'and 21b', each having a free end 23a 'and 23b'. In the free end 23a 'of the heating wire 21a', a lower angle portion 27a 'of a connecting wire 26a' inserted and connected. Its vertical angle section 28a 'is similar to Fig. 4 from the holding mass 24 'out and is welded to a connection portion 37'.

The free end 23b 'of the heating wire 21b' is connected in principle the same way to a lower angle portion 27b 'of the second connecting wire 26b' by insertion and welding. This connecting wire 26b 'is also simply angled upwards with a vertical angle section 28b', but shorter than the other vertical angle section 28a '. The two upper angle sections 28a 'and 28b' are interconnected by means of a perpendicular to them extending Verschaltungsdrahts 29 ', advantageously by welding. This connection is due to the aforementioned reasons outside the holding mass 24 '. Thus, it is provided here that only one connecting wire protruding from the holding mass 24 ', namely the connecting wire 26a', is connected with its upper vertical angle section 28a 'directly to a connecting section 37' of the connecting device.

With the in Fig. 5 The connection method shown can still be reduced compared to the prior art, the number of electrical connections to be made. This can be achieved especially an interconnection of several heating elements.

In the Fig. 6 is a bottom view of the cooking plate 11 according to the invention accordingly Fig. 1 shown. Here is shown relatively schematically how the only heating element 22 of the cooking plate 11 is laid with its heating wire 21 on an underside of the hotplate body 13. The free ends 23 are shown here very schematically and still without connecting wires. However, these can stand out from the illustrated small circles from the drawing plane.

It can be seen that the heating wire 21 of the heating element 22 extends along a total of five concentric circles, each having the same radial distance from each other, ie with five revolutions or turns. With a single-circuit cooking plate shown here, however, there may also be fewer revolutions or turns, especially with a relatively small diameter, for example only two or three. At the turning points their distance from one another should advantageously also be the same in each case and correspond approximately to the radial distance of individual turns or circular rings. This is also approximately the distance between the two free ends 23 to each other and then the connecting wires 26 have each other, see also the Fig. 1 ,

In the Fig. 7 a second cooking plate 111 according to the invention is shown, which has two heating elements 122a and 122b. The heating element 122a has a heating wire 121a and two free ends 123a. The heating element 122b has a heating wire 121b and two free ends 123b. These two heating elements 122a and 122b are also laid along concentric circles, each heating element with two turns. Depending on the size of the concentric surfaces, there may be more cycles than two, for example three to five. It is also possible to provide only a single turn or a single turn. Their free ends 123a and 123b are each arranged as close to each other as possible. The free ends 123b of the second heating element 122b are bent outwards in such a way that the four connecting wires then lie in a line and protrude, as does the four connecting wires Fig. 2 shows. Thus, the simply formed passage portion 130 of Fig. 2 be used.

The two heating elements 122a and 122b can be externally connected differently by a corresponding controller or a switching device in order to be able to set the electric power of the cooking plate 111 as a whole. They can be connected in parallel or in series, if necessary also individually. However, this is known to those skilled in principle and need not be explained in detail.

In the Fig. 8 is a still further inventive cooking plate 211 shown in a hotplate body 213, on the underside of three heating elements 222a, 222b and 222c are arranged. The first heating element 222a has a heating wire 221a with two free ends 223a. The second heating element 222b has a heating wire 221b with two free ends 223b. The third heating element 222c has a heating wire 221c with two free ends 223c. The free ends 223a of the first outer heater 222a are provided on the radially inner winding. The free ends 223b and 223c of the second heating element 222b and the third heating element 222c are provided on the radially outer winding, respectively. As a result, the dashed maximum distance a between the free ends can be reduced. Unlike in Fig. 7 it is not possible in such an interconnection to arrange all connecting wires projecting from the free ends in a line with their vertical angle sections. For such a cooking plate 211, however, can be provided on the one hand that similar Fig. 5 so to speak an internal interconnection is made, so that not six connecting wires are to be connected, but less, for example only four. For example, it could be provided that the second heating element 222b and the third heating element 222c are always operated together and connected in parallel. Then it would be sufficient if a right angle formed connecting wire accordingly Fig. 5 to the left of the free ends 223b of the second heating element 222b protrudes from the holding mass for electrical connection to the outside. From the free ends 223c of the third heating element 222c, connecting wires could then be used, as in FIG Fig. 5 on the right, go to the other connecting wires. Since only the free ends 223a and 223b then have to be connected to the outside with connecting wires, a connection pattern can again be correspondingly provided for them Fig. 7 be provided.

According to a further possibility of connection, if all heating elements are to be interconnected and energized with one another as desired, for example the three left free ends 223a, 223b and 223c can be interconnected internally and led outwards to a connection device only with a single connecting wire. The other three free ends 223a, 223b and 223c then each have their own separate connecting wire, so that a total of only four connecting wires to the outside are needed to a connection device. Again, then in a kind of internal interconnection something elaborate shaped connecting wires must be used.

Claims (13)

Hotplate with: a hotplate body having a top and a bottom, - wherein the top is formed substantially flat, at least one heating element with two free ends is provided on the underside, - The at least one heating element is completely embedded in a holding mass on the underside and completely surrounded by the holding mass, an electrical connection device for the electrical connection of the cooking plate is arranged on the underside and has connection means which are arranged on or in the connection device, the connection device is connected in an electrically conductive manner to the at least one heating element, characterized in that
from each free end of the at least one heating element, a one-piece and continuous metallic connecting wire goes directly to a connection means. Cooking plate according to claim 1, characterized in that at each free end of the at least one heating element is provided and connected to exactly one connecting wire, wherein preferably at least one connecting wire is connected to another connecting wire, in particular outside the holding mass is connected by means of a separate Verschaltungsdrahtes , Cooking plate according to claim 1 or 2, characterized in that stand out from the holding mass only connecting wires which are guided to connection means of the connection device, preferably as many connecting wires protrude from the holding mass as connecting means are provided on the connection means and exactly one connecting wire to exactly one Connection means is connected. Cooking plate according to one of the preceding claims, characterized in that the at least one heating element comprises a coiled heating wire or a coiled heating wire, in particular a round coiled heating wire. Cooking plate according to claim 4, characterized in that a connecting wire is inserted with a free end in a round coiled heating wire at its free end and in particular welded. Cooking plate according to one of the preceding claims, characterized in that the two free ends of a heating element are arranged close to each other, in particular with a distance to each other which is less than the maximum width of the connection device or as the maximum distance from the electrical connections of the connection device, preferably the distance is a maximum of 10 cm. Hotplate according to one of the preceding claims, characterized in that the length of the connecting wires is a maximum of 10 cm, preferably a maximum of 5 cm. Cooking plate according to one of the preceding claims, characterized by at least two heating elements, in particular three heating elements, which run in concentric circles, in particular with at least two circulations per heating element, wherein preferably the heating elements do not overlap or do not cross each other. Cooking plate according to claim 8, characterized in that the free ends of all heating elements have a maximum distance of 10 cm from each other or at most 25% of a diameter of the cooking plate, in particular a maximum of 15%. Cooking plate according to one of the preceding claims, characterized in that the connection means has a metallic plug connection lug, wherein from the plug connection lug a connection portion protrudes from a housing of the connection device and the connection wire is electrically and mechanically fastened thereto, in particular welded. Cooking plate according to one of claims 1 to 9, characterized in that the connection means has a screw connection, preferably exclusively screw terminals, wherein a connecting wire is angled at its upper end again approximately at right angles. Cooking plate according to one of the preceding claims, characterized in that the connecting device has a connecting body made of electrically insulating material, in particular ceramic, wherein preferably the connecting body to a rear surface cover of the hotplate body is attached and / or attached over its underside. Cooking plate according to claim 12, characterized in that the connecting wires are guided by means of electrically insulating passages through the cover, in particular within enclosing ceramic parts, wherein preferably a single passage member is provided for all connecting wires of a cooking plate, in particular this passage part with more than 70% of his Volume is disposed within the cooking plate or below the cover.

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