DE102020003723A1 - Heating device for an electric accumulator - Google Patents

Abstract

The invention relates to a heating device (1) for an electrical accumulator (5) comprising a positive pole (8) and a negative pole (9), which comprises a carrier film (2) with an electrical heating element (10, 15), wherein in a heating operating mode the Heating device (1) the accumulator (5) can be heated by means of the heating element (10, 15). According to the invention, a first conductor track (12) and a second conductor track (13) are provided, via which the positive pole (8) and the negative pole (9) of the accumulator can be contacted with an electrical and / or electronic network, the conductor tracks (12, 13 ) are attached to the carrier film.

Description

The invention relates to a heating device of the type specified in claim 1, provided for an electrical accumulator, in particular a traction accumulator, in particular with integrated cell voltage monitoring.

Electrically drivable motor vehicles, in particular motor vehicles, have an electrical accumulator which stores electrical energy for an electrical drive unit of the electrically drivable motor vehicle and / or provides electrical energy for the electrical drive unit. Such an accumulator, which can also be called a traction accumulator (“traction battery”), is thus an electrical energy storage device for the electrically drivable or mobile motor vehicle. When the traction accumulator or the electric drive unit is in operation, the traction accumulator has the highest degree of efficiency in a predetermined temperature range. Consequently, it is desirable to temper the electrical accumulator or traction accumulator as quickly as possible in such a way that its operation takes place in the predetermined temperature range or with the highest degree of efficiency.

The traction accumulator is usually formed from a multiplicity of accumulator cells or accumulator cell blocks and is particularly space-consuming in order to meet requirements for an at least partially electric propulsion of the motor vehicle or motor vehicle. The temperature of the accumulator cells or cell blocks must be controlled so that they can be operated at their highest possible efficiency. Here, the temperature control, heating and in particular cooling of the respective cell or the respective cell block can include. The purpose of cooling the traction accumulator is to bring the traction accumulator to a particularly advantageous operating temperature as quickly as possible, especially if the motor vehicle that has the traction accumulator was deactivated for a particularly long time and was subject to a particularly low outside temperature, for example in winter.

It is known from the prior art to carry out the heating or heating or warming of the traction accumulator or the accumulator cells or the accumulator cell blocks by using a cooling fluid, e.g. Water or air flows through a heat transfer body applied to an outer surface of the traction accumulator and has been previously heated so that heat from the heated cooling fluid passes over the heat transfer body and via the outer surface into the traction accumulator or the accumulator cells, whereby the traction accumulator is heated. It is also known to heat the traction accumulator by means of an external heating element.

The US 2017/025722 A1 discloses a battery pack having at least one pouch battery cell in which opposing polymeric film walls hold battery electrodes, with exposed battery terminal elements being provided. The battery pack further has a flexible film heater with exposed heater connection elements, the flexible film heater being in thermal contact with at least one of the polymeric film walls in order to heat it when a voltage is applied between the heater connection elements. In this case, however, there is a particularly unfavorable thermal path for heating up the accumulator cells, this conventional heating film resting as a flat support on the outer surface of the respective accumulator cell.

By heating the traction accumulator via its accumulator poles - that is to say via the respective plus and minus poles of the accumulator cells - this problem can be counteracted at least partially. Temperature control, in particular heating, of the battery cells via the poles is preferable to temperature control via the respective outer surface of the battery cells, since the pole temperature control enables more uniform temperature control of the battery cells, which leads to slower aging and slower degradation of the battery cells, especially if this are designed as lithium-ion cells. Furthermore, the pole temperature control advantageously ensures a lower heat transfer resistance, so that the temperature control of the accumulator cells takes place particularly efficiently. This is because the poles are usually in direct mechanical contact with metallic carrier foils of electrodes of the accumulator cells, that is to say of cell electrodes. However, such a pole temperature control requires a large number of components, so that such a pole temperature control is particularly complex.

The object of the present invention is to provide a heating device for particularly efficient heating of an accumulator, in particular a traction accumulator of a motor vehicle, which has a particularly simple design.

According to the invention, this object is achieved by a heating device having the features specified in claim 1. Advantageous refinements with expedient developments of the invention are specified in the remaining patent claims.

According to the invention is therefore a heating device for an electrical accumulator, in particular traction accumulator, a motor vehicle provided. The traction accumulator is designed to interact with an electric drive device of the motor vehicle, for example in a discharge mode in which the electric traction accumulator of the drive unit of the motor vehicle provides electrical energy for operating or moving the motor vehicle. Furthermore, the traction accumulator can be operated in a charging mode in which the electric drive unit provides the traction accumulator with electrical energy for charging or recharging. This means that the electric drive unit is operated as a motor when the traction accumulator is discharged and as a generator when it is charged. In addition, further operating modes of the electric traction accumulator are possible, for example a further charging mode in which the electric traction accumulator is provided with electrical energy via a charging device external to the vehicle.

The motor vehicle is designed in particular as a motor vehicle, that is to say, for example, as a passenger car and / or truck, and is designed to be at least partially electrically drivable or movable due to the electric drive unit. This means that the motor vehicle is in particular an electric vehicle, hybrid motor vehicle, fuel cell motor vehicle, etc. It is to be understood that the at least partially electrically drivable or moveable motor vehicle (inside the vehicle) has the electric accumulator or traction accumulator, which is coupled or can be coupled to the electric drive unit during operation of the electrically drivable or moveable motor vehicle. It also applies to the motor vehicle that it can be designed as a motorcycle, a bus, a self-propelled work machine, etc.

In general, the heating device according to the invention can be used in conjunction with any electrical accumulator that is used to store electrical energy. This means that the electric heating device is not limited to an application in the automotive field. In particular, it is conceivable to use the heating device in the area of aviation and shipping as well as in the area of stationary systems.
The electrical accumulator or traction accumulator comprises a multiplicity of accumulator cells or a multiplicity of accumulator cell blocks, wherein in the respective accumulator cell block several accumulator cells can be combined to form the accumulator cell block. The respective accumulator cell or the respective accumulator cell block each has a positive pole and a negative pole, which represent contacting elements on the accumulator side.

The heating device also has a carrier film, which in turn comprises an electrical heating element. The electrical heating element can be, for example, a heating conductor which is formed from a metallic material, in particular from a metallic material comprising copper. It is provided that the heating element or the heating conductor emits heat by energizing the heating conductor or the heating element. It should be understood that the carrier film can have more electrical heating elements, and it is also to be understood that the carrier film can be formed by a carrier film stack which has a plurality of individual films, in particular directly adjoining one another.

The electrical heating element and the carrier film or the carrier film stack together form, so to speak, a heating film that can be switched to a heating mode in which an electrical voltage and / or an electrical current is applied to contacting elements of the electrical heating element, so that the electrical heating element is powered by the electrical current is traversed. In this case, the electrical heating element then emits heat by means of which the electrical accumulator or traction accumulator can be heated, for example when the carrier film together with the electrical heating element - i.e. the heating film - is thermally coupled to the accumulator. For this purpose, it can be provided, for example, that the heating foil and the traction accumulator or its accumulator cells are in direct contact with one another.

In order to be able to heat the accumulator or traction accumulator particularly efficiently by means of the heating device, the heating device having a particularly simple or low-cost structure, according to the invention a first conductor track different from the electrical heating element and a second conductor track from the electric heating element and from the first conductor track different conductor track provided. Here, the first conductor track is designed to contact the accumulator or traction accumulator and an electrical and / or electronic network via the positive pole of the accumulator, the second conductor track being designed to connect the accumulator or traction accumulator and the electrical and / or Electronics network to contact each other via the negative pole. In this case, the first conductor track and the second conductor track (in particular directly) are attached to the carrier film - that is to say to the heating film. The electrical and / or electronic network includes in particular means for cell voltage monitoring or is at least partially formed by the means for cell voltage monitoring.

It is provided in particular that the carrier film, the electrical heating element and the Both conductor tracks are each designed to be reversibly bendable, in particular flexible, non-destructively and without material fatigue. This means that it is provided in particular that the heating device is designed as a whole in the form of a non-destructive or materially fatigue-free reversibly bendable, in particular pliable, film or in the form of a likewise configured film stack.

In this way, on the one hand, the particularly efficient pole temperature control or pole heating is provided, and on the other hand, the heating device forms a contacting device for the accumulator. This means that the heating device has a dual functionality. There is also an advantage with regard to the packaging, since the conductor tracks for contacting the battery with the electrical and / or electronic network and the carrier film with the electrical heating element are provided in a common component, namely the heating device, so that the heating device is particularly space-efficient or . forms a space-efficient component. Advantages in terms of packaging are of great interest in vehicle construction, in particular series vehicle construction.

Further advantages, features and details of the invention emerge from the following description of a preferred exemplary embodiment and with reference to the drawing. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination, but also in other combinations or alone, without the scope of the Invention to leave.

• 1 eine schematische und teilweise geschnittene Ansicht einer Heizeinrichtung mit einer Trägerfolie, einem Leiterbahnenbereich und einer Deckfolie;
• 2 eine schematische und teilweise transparente Ansicht einer weiteren Ausführungsform der Heizeinrichtung; und
• 3 eine schematische Ansicht der Heizeinrichtung in einer weiteren Ausführungsform mit Kaltleiter-Heizelementen.

It shows

• 1 a schematic and partially sectioned view of a heating device with a carrier film, a conductor track area and a cover film;
• 2 a schematic and partially transparent view of a further embodiment of the heating device; and
• 3 a schematic view of the heating device in a further embodiment with PTC thermistor heating elements.

In the figures, elements that are the same or have the same function are provided with the same reference symbols.

1 shows a heating device in a schematic and partially sectioned view 1 with a carrier film 2 , a conductor track area 3 and a cover sheet 4th . The heating device 1 is for an electric accumulator 5 (first time in 2 shown) provided. With the electric accumulator 5 it is, in particular, a traction accumulator (“traction battery”) of a motor vehicle (not shown), which is designed in particular as a motor vehicle - that is, as a passenger vehicle and / or as a truck. Here, the motor vehicle can at least partially be driven or moved electrically, which means that the motor vehicle is in particular an electric motor vehicle, a hybrid motor vehicle, a fuel cell motor vehicle, etc.

The electric accumulator or traction accumulator 5 is connectable or connected to an electric drive unit of the motor vehicle or the passenger vehicle. The electric drive unit has, for example, an electric machine which, in motor operation, generates electrical energy that is stored in the traction accumulator 5 is stored, converted into mechanical energy for moving the motor vehicle. The electric machine of the electric drive unit of the motor vehicle can also be operated in generator mode, in which the electric machine or the electric drive unit of the motor vehicle is connected to the traction accumulator 5 provides electrical energy. Such a generator operation of the electric drive unit of the motor vehicle is commonly known as “recuperation operation”.

The traction accumulator 5 has a large number of accumulator cells 6 on, of which only a few are shown in the figures. Furthermore, the accumulator cells 6 for reasons of clarity, only occasionally provided with the corresponding reference numerals. It is also conceivable that two or more of the accumulator cells 6 are combined to form a respective accumulator cell block. The respective battery cell 6 or the respective accumulator cell block has two electrical contacting elements 7th on, each as a positive pole 8th or as a negative pole 9 are trained. The contacting elements 7th , so the positive poles 8th and the negative poles 9 , are in 3 shown.

The heating device 1 further has the carrier film 2 on the at least one heating element 10 , present a variety of heating elements 10 , having. The heating element 10 is designed as an electrical heating element that emits heat when the electrical heating element 10 is energized, for example by means of an external voltage source. The heating device 1 is further designed to heat the traction accumulator 5 to be at least thermally coupled with this. So it is from an accumulator arrangement 11 (please refer 2 and 3 ) assumed that the heating device 1 and the traction accumulator 5 has, it is provided that the heating device 1 and the accumulator 5 are thermally coupled to one another, for example that the heating device 1 and the accumulator 5 touch each other directly or immediately.

For heating or warming the traction accumulator 5 it is provided that the heating device is switched to a heating operating mode, for example by the heating elements 10 be supplied with voltage. This then makes the traction accumulator 5 by means of the heating device 1 , in particular by means of the heating elements 10 , heatable.

In addition, is with the heater 1 provided that this is a first conductor track 12th and at least one second conductor track 13th having that in the conductor track area 3 the heater 1 are trained. That means the heating device 1 the conductor track area 3 and consequently at least the conductor tracks 12th , 13th includes. The conductor tracks 12th , 13th are designed to use the contacting elements 7th the traction accumulator 5 and to electrically connect an electrical and / or electronic network, in particular of the motor vehicle, to one another.

The electrical and / or electronic network in particular has a measuring device so that the conductor tracks 12th , 13th or the conductor track area 3 can be used to measure at least one operating parameter of the electrical and / or electronic network, wherein the operating parameter can be a voltage, a temperature, etc., for example. It is particularly preferred if the conductor tracks 12th , 13th or the conductor track area 3 a cell voltage of the accumulator cells is / will be used for this purpose 6 to measure or monitor. Next can the conductor tracks 12th , 13th for balancing the traction accumulator 5 can be used.

The traction accumulator points 5 more than one battery cell 6 on, are the poles 8th , 9 via cell connectors 21st (please refer 2 ) connected with each other. For a series connection of the accumulator cells 6 are by means of a cell connector 21st a positive pole 8th a first accumulator cell 6 and a negative pole 9 another battery cell 6 electrically connected to one another. It is then provided that one of the conductor tracks 12th , 13th , 14th and one of the cell connectors 21st are electrically connected to each other.

The conductor tracks 12th , 13th comprehensive conductor track area 3 is on the carrier film 2 attached or attached to it. For example, it can be provided that the carrier film 2 and the conductor track area 3 glued to one another or otherwise connected to one another in a material, non-positive and / or positive manner. It is the conductor track area 3 for example a material layer in which the conductor tracks 12th , 13th as well as possibly further conductor tracks 14th are embedded.

In this configuration, it is the heating device 1 further provided that the heating element 10 , which in particular is an electrical PTC thermistor heating element 15th (PTC heating element, PTC: positive temperature coefficient - positive temperature coefficient) includes or is formed from this, also on the carrier film 2 is appropriate. The heating element 10 or the PTC thermistor heating element 15th is then such on the carrier film 2 attached that the conductor tracks 12th , 13th , 14th or the conductor track area 3 and the PTC thermistor heating element 15th or the heating element 10 over the carrier film 2 are spaced from each other. Regarding 1 It should be noted that the illustrated strength or thickness of the respective heating element 10 on the strength or thickness of the carrier film 2 may differ, so that between the conductor track area 3 and the respective heating element 10 Material of the carrier film 2 can be arranged.

It is also conceivable that the heating element 10 or the PTC thermistor heating element 15th on an outside surface 16 the carrier film 2 is appropriate. Next - and as in 1 shown - it can be provided that the respective heating element 10 or the respective PTC thermistor heating element 15th at least partially in the material of the carrier film 2 is embedded, the conductor tracks 12th , 13th , 14th or the conductor track area 3 on the outer surface 16 the carrier film 2 are / is arranged. It is particularly provided here that the conductor tracks 12th , 13th , 14th only on the outer surface 16 the carrier film 2 are arranged, that is, that the conductor tracks 12th , 13th , 14th not in the material of the carrier film 2 extend into it or that the conductor tracks 12th , 13th , 14th not - not even partially - in the material of the carrier film 2 are embedded.

The heating element 10 comprises alternatively or in addition to the PTC thermistor heating element 15th a Peltier element or is at least partially formed from it. With a given polarity of a DC supply voltage, the Peltier element has a hot side and a cold side, it being provided in the present case that the cold side - which represents a heat sink - of the conductor tracks 12th , 13th , 14th is turned away, whereas the hot side of the Peltier element is the conductor tracks 12th , 13th , 14 and consequently the poles to be heated 8th , 9 the respective accumulator cell 6 is facing.

Next is 1 it can be seen that the heater 1 present as a stack of foils 17th is formed that the carrier film 2 , the Conductor area 3 and the cover sheet 4th includes. That means the stack of foils 17th or the heating device 1 in the present case through the carrier film 2 , through the strip conductor area designed as a film 3 and through the cover sheet 4th is formed. It is particularly preferred here if the carrier film 2 , the conductor track area 3 , the cover sheet 4th as well as the conductor tracks 12th , 13th , 14th and the heating elements 10 are each designed to be reversibly bendable, in particular pliable, in a non-destructive manner. In this way the heater is 1 overall non-destructive and reversibly bendable, in particular flexurally slack, so that the heating device 1 is particularly versatile and / or flexible in use. For example, the heating device 1 or the stack of foils 17th then particularly closely to a contour, for example the traction accumulator 5 , so that a particularly efficient heat transfer between the heating elements 10 and the traction accumulator 5 can be done.

At the stack of foils 17th can furthermore be provided that the individual films, that is to say the carrier film 2 , the conductor track area 3 and the cover sheet 4th are laminated, so that for example the carrier film 2 and the conductor track area 3 are flatly connected to each other and the conductor track area 3 and the cover sheet 4th are also connected to one another over a large area. It can also be provided that the conductor track area 3 an intermediate layer between the carrier film 2 and the cover sheet 4th forms and form-fitting between the carrier film 2 and the cover sheet 4th is held by the carrier film 2 and the cover sheet 4th , for example at the edge areas, are laminated together. In other words, the carrier film 2 and the cover sheet 4th together form a pocket in which the conductor track area 3 is arranged.

2 shows a further embodiment of the heating device in a schematic and partially transparent view 1 . The heating device 1 , in the 2 as part of the accumulator assembly 11 is shown, in this case has the heating elements only in regions or sections 10 on. Generally applies to the heating device 1 in connection with the respective heating element 10 that the respective heating element 10 in turn can be designed as a heating film. Such heating foils are already known from the prior art. That means the heating elements 10 or the heating foils in the present case in a first area 18th and in a second area 19th the heater 1 or the accumulator arrangement 11 are trained. In this way the heater is 1 particularly resource-saving and can be produced according to requirements. Accordingly, it is provided in the present case that the heating elements 10 , 15th exactly in the areas 18th , 19th are arranged in the accumulator arrangement 11 with a positional position of the contacting elements 7th or the Pole 8th , 9 correspond. Because of this, the heater is 1 designed so that it can be operated particularly efficiently, because heating or heating of another area is advantageously dispensed with, and the pole heating or pole temperature control takes place via the heating elements 10 , 15th in the fields of 18th , 19th .

In 2 are also from the Poles 8th , 9 different contacting elements 20th indicated over which the heating elements 10 can be electrically connected to an energy supply, in particular a voltage source, to the heating device 1 to be supplied with operating energy in heating mode. It should be understood that the contacting elements 20th the heating elements 10 , 15th - similar to the heating elements 10 , 15th yourself - with the carrier film 2 are (mechanically) connected. Alternatively or additionally it can be provided that the contacting elements 20th as a conductor path 12th , 13th , 14th or in addition to the conductor tracks 12th , 13th , 14th in the conductor track area 3 are arranged or run therein.

The heating device 1 borders - as in 2 shown - with the conductor tracks 12th , 13th , 14th or with the conductor track area 3 directly to the battery cells 6 of the traction accumulator 5 on, in this case via the cell connector 21st each adjacent pole 8th , 9 of the accumulator cells 6 connect or short-circuit. This means that there is a respective cell connector 21st and a respective one of the conductor tracks 12th , 13th , 14th touch directly so that the respective cell connector 21st and the respective of the conductor tracks 12th , 13th , 14th are electrically conductively or conductively connected to one another. It follows that the pole 8th , 9 of the accumulator cells 6 via the cell connector 21st and via the conductive paths with which electrical contact is made 12th , 13th , 14th are electrically conductively connected or connectable to the electrical or electronic network, the electrical or electronic network - as already mentioned - the measuring device for voltage monitoring of the accumulator cells 6 and consequently for voltage monitoring of the traction accumulator 5 having.

Should be the cover sheet 4th be provided are for contacting the conductor tracks 12th , 13th , 14th with cell connectors 21st and / or with the poles 8th , 9 of the accumulator cells 6 Areas without cover film at the heating device 1 provided, for example, under a manufacture of the heating device 1 and / or when producing the accumulator arrangement 11 can be generated.

3 shows the heating device in a schematic view 1 in a further embodiment in which no cover film 4th is used and as a PTC thermistor heating element 15th trained heating elements 10 on the carrier film 2 are arranged. It can be seen that the carrier film 2 and the conductor track area 3 can be designed in one piece with one another, that is to say form one and the same film, since the contacting elements 20th the PTC thermistor heating elements 15th according to 3 in / on a single film body, namely that through the carrier film 2 and the conductor track area 3 formed film, run. However, when the carrier film is produced in one piece 2 with the conductor track area 3 several different materials are used, for example a first material for the carrier film 2 , a second material for the conductor track area 3 and a third material for the conductor tracks 12th , 13th , 14th or contacting elements 20th by coextruding the different materials with one another, for example.

Overall, the invention shows how by means of the heating device 1 a particularly efficient heating or warming up - namely by pole heating - of the traction accumulator 5 is made possible, the heating device 1 is nevertheless particularly simple and inexpensive. It is proposed to avoid a particularly high number of components and for the particularly efficient coupling of heat into areas of the traction accumulator that conduct heat well 5 , using the heater 1 , which is designed as a heating foil or heating foil stack, the heating heat via the contacting elements 7th the respective accumulator cell 6 directly onto the inner electrode foils of the respective accumulator cell 6 to direct. This results in particularly efficient heating of the respective accumulator cell 6 and consequently the traction accumulator 5 reached, the conductor tracks 12th , 13th , 14th and in particular the contacting elements 20th to operate the heating elements 10 , 15th are adequately designed or dimensioned, in particular for currents up to 5 amperes.

It is also conceivable as an alternative or in addition to the conductor tracks 12th , 13th , 14th and / or to the contacting elements 20th further (electrical and / or electronic) components or components in the film stack 17th or on the stack of foils 17th to be provided. In particular, these further electrical or electronic components can be in the conductor track area 3 be arranged.

It's by the heater 1 also note that the conductor tracks 12th , 13th , 14th or the contacting elements 20th of the contacting elements 7th of the traction accumulator 5 Remain electrically isolated if there is no direct electrical contact between the conductor tracks 12th , 13th , 14th and the contacting elements 7th required (e.g. for a voltage measurement). Will the heating device 1 for example, to measure a temperature of the traction accumulator 5 used would be due to an undesired short circuit between the cell connectors 21st or the contacting elements 7th and the conductor tracks 12th , 13th , 14th and / or the contacting elements 20th safe operation of the traction accumulator 5 not guaranteed. This can lead to an insulation fault between a high-voltage potential and a low-voltage potential, for example.

To the heater 1 To further protect against overheating, it can be provided that in the conductor track area 3 , especially in the respective conductor track 12th , 13th , 14th one of the PTC thermistor heating element 15th different PTC element is introduced, which, due to the operating principle, reduces, in particular interrupts, the current at a corresponding temperature. This temperature, on the basis of which the PCT element reduces or interrupts the current, can, for example, be derived from waste heat from the traction accumulator 5 result.

The PTC thermistor heating elements 15th , for example, a heating power of about 2 Watts can provide the advantage that they are used in the manufacture of the heating device 1 or in the manufacture of the accumulator arrangement 11 can be adjusted as required to a maximum required or maximum desired heating temperature, in particular by means of a selection of the material composition of the PTC thermistor heating elements 15th . The maximum heating temperature can be set, for example, to approx. 60 ° C by changing the material composition of the respective PTC thermistor heating element 15th is selected accordingly. It is also conceivable that the PTC thermistor heating elements 15th non-destructively reversibly bendable, in particular pliable, are formed, which is what the idea of the overall non-destructively reversibly bendable, in particular pliable heating device 1 in the form of the non-destructively reversibly bendable, particularly limp film stack 17th , which comprises at least one correspondingly designed individual film.

List of reference symbols

1

Heating device

2

Carrier film

3

Conductor area

4th

Cover sheet

5

(Traction) accumulator

6

Accumulator cell

7th

Contacting element

8th

Positive pole

9

Negative pole

10

Heating element

11

Accumulator arrangement

12th

Track

13th

Track

14th

Track

15th

PTC thermistor heating element

16

Exterior surface

17th

Stack of foils

18th

Area

19th

Area

20th

Contacting element

21st

Cell connector

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2017025722 A1 [0005]

Claims (5)

Heating device (1) for an electrical accumulator (5) comprising a positive pole (8) and a negative pole (9), which comprises a carrier film (2) with an electrical heating element (10, 15), with the heating device (1) in a heating operating mode the accumulator (5) can be heated by means of the heating element (10, 15), characterized by a first conductor track (12) and a second conductor track (13), via which the positive pole (8) and the negative pole (9) of the accumulator (5) can be contacted with an electrical and / or electronic network, the conductor tracks (12, 13) being attached to the carrier film (2). Heating device (1) Claim 1 , characterized in that the heating element (10) is an electrical PTC thermistor heating element (15), the PTC thermistor heating element (15) being attached to the carrier film (2) in such a way that the conductor tracks (12, 13) and the PTC thermistor -Heating element (15) are spaced apart from one another via the carrier film (2). Heating device (1) Claim 1 or 2 , characterized in that the heating element (10, 15) is at least partially embedded in a material of the carrier film (2) and the conductor tracks (12, 13) are arranged on an outer surface (16) of the carrier film (2). Heating device (1) according to one of the preceding claims, characterized by a cover film (4) which at least partially covers the conductor tracks (12, 13) so that they are arranged between the cover film (4) and the carrier film (2). Heating device (1) according to one of the preceding claims, characterized in that the heating device (1) is designed overall in the form of a non-destructively reversibly bendable, in particular pliable film (17).

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