Battery system for a motor vehicle and motor vehicle with a replaceable battery

Abstract

The present invention relates to a battery system (1) for a motor vehicle (2), the battery system having a battery (3) for supplying electrical energy to the motor vehicle (2), the battery having a first inverter (4) for converting the direct current of the battery (3) into alternating current and a first coil (5) for generating an alternating magnetic field for transferring energy to the motor vehicle (2), the battery system further having a second coil (7) that can be arranged on the motor vehicle (2) and can be electrically coupled to the on-board electrical network (6) of the motor vehicle (2), the second coil being for receiving energy from the first coil (5). The first coil (5) is wound around a first coil core (8) and the second coil (7) is wound around a second coil core (9), wherein the first coil core (8) has a first contact region (10) for mechanically coupling to a second contact region (11) of the second coil core (9) to form a common coil core. The present invention also relates to a motor vehicle (2).

Description

[0001] The present invention relates to a battery system for a motor vehicle. Furthermore, the present invention relates to a motor vehicle having a battery system of the type according to the present invention.

[0002] Motor vehicles operated by batteries, such as electric vehicles and some hybrid vehicles, have an electric motor for driving the motor vehicle, power electronics for loading the electric motor with electrical energy in order to control the power of the electric motor, a battery for providing the electrical energy for operating the electric motor, and an on-board electrical system for distributing the electrical energy to the electrical appliances of the motor vehicle. In order to provide sufficient power for this purpose, the battery is mostly designed as a high-voltage battery with a voltage between 250 V and 800 V depending on the vehicle class and vehicle type.

[0003] Motor vehicles operated by batteries have the advantage that no exhaust gases from an internal combustion engine are generated during operation and thus have a particularly low impact on the air quality of the surroundings of the motor vehicle. Furthermore, the electric motor also has a high torque at low speeds and is characterized by low noise emission.

[0004] One weakness of motor vehicles operated by batteries is the battery. The conventional batteries of motor vehicles operated by batteries are relatively large and significantly increase the overall weight of the motor vehicle. Therefore, the driving range of motor vehicles operated by batteries is usually significantly less than that of similar motor vehicles driven by an internal combustion engine. Furthermore, the conventional battery exhibits a significant accident risk especially in the event of a vehicle collision with increasing energy density of the battery cells. Finally, the disadvantage of the battery is that the charging process of the battery is significantly longer than the refueling process in a motor vehicle with an internal combustion engine even with a fast charging device. This is particularly problematic for long-distance trips because the driver is thereby forced to stop for a longer time.

[0005] A possibility for reducing this forced stop is to provide replaceable batteries. Since the battery usually weighs several hundred kilograms, the replacement of the battery is mostly carried out automatically by a battery replacement device designed for this purpose. A battery system for a motor vehicle with a replaceable battery is known from the patent document EP 2 454 120 B1. The battery has a battery housing which can be mechanically connected to the motor vehicle by means of a coupling element. A coil is arranged on the battery housing for inductively transferring energy to a coil on the vehicle side. The disadvantage of such a battery system is that inductive energy transfer has relatively high losses. Furthermore, the relative position of the two coils to each other can only be controlled with difficulty.

[0006] According to an alternative embodiment, the motor vehicle and the battery have plug contacts that can be connected to each other, such as a high-voltage plug or a high-voltage socket, which can engage with each other when the battery is arranged on the motor vehicle to be electrically coupled. The disadvantage of such plug contacts is that they may be prone to skew misalignment with each other when the battery is guided onto the motor vehicle, thereby damaging the electrical contacts. This causes the plug contacts to often no longer provide a reliable electrical coupling after only a small number of coupling cycles and must be replaced.

[0007] Therefore, the technical problem to be solved by the present invention is to eliminate or at least partially eliminate the above-mentioned drawbacks in the battery system for a motor vehicle. In particular, the technical problem to be solved by the present invention is to implement a battery system for a motor vehicle and a motor vehicle having a battery system of the type according to the present invention, which avoid high losses in inductive energy transfer in a simple and cost-effective manner and ensure the safety and reliable electrical and / or mechanical coupling of the battery and the power electronics of the motor vehicle.

[0008] The above technical problem is solved by the respective claims. Therefore, the technical problem is solved by a battery system for a motor vehicle having the features of independent claim 1 and by a motor vehicle having the features of parallel claim 10. Other features and details of the present invention follow from the dependent claims, the description, and the drawings. Here, the features and details described in connection with the battery system according to the present invention clearly also apply in combination with the motor vehicle according to the present invention and vice versa accordingly. Therefore, with respect to the disclosure, the various inventive aspects can always be cited from each other.

[0009] According to a first aspect of the present invention, the technical problem is solved by a battery system for a motor vehicle. The battery system has a battery for supplying electrical energy to the motor vehicle, the battery having a first inverter for converting the direct current of the battery into alternating current and a first coil for generating an alternating magnetic field for transferring energy to the motor vehicle. The battery system also has a second coil that can be arranged on the motor vehicle and can be electrically coupled to the on-board electrical network of the motor vehicle, the second coil being used to receive energy from the first coil. According to the present invention, the first coil is wound around a first coil core and the second coil is wound around a second coil core, wherein the first coil core has a first contact area for mechanically coupling with a second contact area of the second coil core to form a common coil core.

[0010] The battery is preferably designed as a high-voltage battery. In the context of the present invention, a high-voltage battery is understood to be a battery having a battery voltage between 250 V and 1500 V, in particular about 400 V. The maximum battery current intensity of the battery is preferably between 200 A and 1000 A, in particular about 600 A. The technology of the battery can be based, for example, on lithium-ion technology or a similar battery technology of rechargeable batteries with a relatively high power density. The battery preferably has a battery housing that encloses one or more battery cells of the battery, as well as a first coil and a first converter and protects them from environmental influences. The battery housing preferably has at least one opening for exposing a first contact area or a perforation for guiding out the first contact area of the first coil core. The battery housing preferably has two separate openings for respectively exposing the first contact area or two separate perforations for respectively guiding out the first contact area of the first coil core. Alternatively, the battery housing has one perforation and one opening.

[0011] The first converter is designed to convert the direct current of the battery into alternating current. Inductive energy transfer from the first coil to the second coil can be achieved through the alternating current. The direct current input terminal of the first converter is electrically coupled to the direct current electrode of the battery. The alternating current output terminal of the first converter is electrically coupled to the coil end of the first coil. The first converter is preferably arranged within the battery housing. The first converter is further preferably designed to convert alternating current into direct current in the context of the charging process of the battery.

[0012] The battery system preferably has a second converter that is arranged in the region of the second coil. The alternating current input terminal of the second converter is electrically coupled to the coil end of the second coil. The direct current output terminal of the second converter can be electrically coupled to the direct current contact of the vehicle electrical system of a motor vehicle. The second coil and the second converter are preferably enclosed by a coil housing, wherein the coil housing preferably has an opening for a second contact area and a perforation for the direct current output terminal. The direct current output terminal is preferably designed as a plug or socket for electrically and mechanically coupling to a socket or plug of the vehicle electrical system of a motor vehicle. The coil housing preferably has a fixing section for fixing the coil housing to the motor vehicle. The coil housing can be installed on the motor vehicle in this way and can thus remain on the motor vehicle when the battery is replaced. The second converter is further preferably designed to convert direct current into alternating current in the context of the charging process of the battery.

[0013] The first coil is designed as a first coil winding made of coil wire, in particular of varnished copper wire, and is wound around a first coil core with a first number of turns, such that the first coil core is preferably arranged coaxially with the first coil winding. The first coil core preferably has or consists of a ferromagnetic material, such as iron. The first coil core preferably has a rectangular, in particular square, cross-section. The first contact area preferably has a rectangular, in particular square, cross-section.

[0014] The second coil is designed as a second coil winding made of coil wire, in particular of varnished copper wire, and is wound around a second coil core with a second number of turns, such that the second coil core is preferably arranged coaxially with the second coil winding. The second number of turns preferably corresponds to the first number of turns. The second coil core preferably has or consists of a ferromagnetic material, such as iron. The second coil core preferably has a rectangular, in particular square, cross-section. The second contact area preferably has a rectangular, in particular square, cross-section. The second coil core further preferably has, particularly in the second contact area, a cross-section which corresponds in shape and size to the cross-section of the first coil core, particularly in the first contact area.

[0015] The contact area is particularly understood in the context of the present invention as a contact surface. A planar contact can be formed between the first coil core and the second coil core by the contact of the first contact area with the second contact area. The contact surface is preferably designed in a plate-like or substantially plate-like manner.

[0016] The battery system according to the invention is designed such that the first contact area can be brought into contact with the second contact area by the combination of the first coil core and the second coil core. The common contact surface of the first contact area and the second contact area preferably corresponds in shape and size to the first contact surface and the second contact surface. In this way, the first coil core and the second coil core form a common, preferably air-gap-free, coil core.

[0017] The battery system preferably further has a third coil which is designed to inductively charge the battery. The third coil is preferably arranged inside the battery housing and is thus protected from the environment. Further preferably, a third converter is arranged on the third coil. The first coil and the third coil are preferably arranged on different, in particular opposite, sides of the battery.

[0018] The advantages of the battery system according to the present invention over traditional battery systems are that an electrical coupling can be established between the battery and the on-board electrical system of a motor vehicle in a simple device and in a cost-effective manner. The battery can be replaced on the motor vehicle without damaging the electrical plug contacts thereby. The battery system according to the present invention is thus designed to be significantly more robust and less subject to wear than known battery systems. In addition, the advantage of forming a common coil core by the mutual contact of the first contact area and the second contact area is that the inductive transfer between the first coil and the second coil, i.e., from the battery to the on-board electrical system, is implemented according to a transformer and thus has lower losses. The availability of the electrical energy stored in the battery is thereby significantly improved.

[0019] According to a preferred expansion design of the present invention, it can be specified in the battery system that the first coil core has two first contact areas and the second coil core has two second contact areas, wherein the first coil core and the second coil core are designed to form a closed common coil core by the contact of the first contact areas with the second contact areas respectively. Preferably herein, the first coil core and the second coil core are designed to form a closed common coil core having a rectangular, in particular square, contour. The advantages of the closed common coil core are that the inductive energy transfer between the first coil and the second coil, i.e., from the battery to the on-board electrical system, is further improved in a simple device and in a cost-effective manner.

[0020] According to the present invention, preferably, the first coil core is designed in a U shape with two first contact areas, wherein the second coil core is designed in a U shape or an I shape or a rod shape with two second contact areas. The first contact areas are preferably arranged parallel to each other and / or arranged in a common plane. In the U-shaped design, the first coil core has two parallel or substantially parallel legs, which are interconnected by a connecting area. The first contact areas are preferably arranged on the end faces of the legs facing away from the connecting area. In the I-shaped second coil core, the second contact areas are preferably arranged on the same side of the second coil core. According to the present invention, it can be specified that the first coil core is designed in an I shape and the second coil core is designed in a U shape. Also feasible within the scope of the present invention is an L-shaped design of the first coil core and the second coil core. The advantage of this is that a common coil core can be formed in a simple device and in a cost-effective manner.

[0021] Further preferably, the second coil core is arranged in the coil housing, wherein the coil housing has recesses in the region of the second contact area for respectively receiving the first contact area of the first coil core. This means that a partial area of the first coil core engages into the coil housing for coupling with the second coil core. It can be provided here according to the invention that the first contact area has at least one chamfer which facilitates such insertion. The second contact area preferably has a corresponding mating profile so that a uniformly closed common coil core can be formed. The inner cross-section of the recess preferably substantially corresponds to the outer cross-section of the coil housing, so that the recess is designed as a guide for the first coil core. Further preferably, fixing means for fixing the coil housing to the motor vehicle are arranged on the coil housing. This has the advantage of improving the orientation of the battery relative to the motor vehicle in a simple device and in a cost-effective manner for coupling the battery to the motor vehicle.

[0022] In a particularly preferred design of the invention, the battery system has locking means for temporarily fixing the battery to the motor vehicle. The locking means are preferably arranged on the battery housing and can engage with a mating holding means of the motor vehicle for locking. The locking means preferably have screw connection means, clamping means or the like. This has the advantage of being able to determine the relative position of the battery relative to the motor vehicle in a simple device and in a cost-effective manner.

[0023] The battery system preferably has pressure means for pressing the first contact area onto the second contact area and / or for pressing the second contact area onto the first contact area. The pressure means have, for example, a pressure spring. The pressure means are preferably designed to press onto the first coil core and / or the second coil core when the battery is arranged on the motor vehicle such that the first coil core and the second coil core are pressed against each other. It can be provided according to the invention that the pressure means are designed as locking means for temporarily fixing the battery to the motor vehicle. The advantage of the pressure means is that the contact between the first contact area and the second contact area can be improved in a simple device and in a cost-effective manner. This ensures that the common coil core is held even in strong shocks and vibrations, for example on rough terrain, and the contact areas of the two coil cores do not separate from each other.

[0024] According to a preferred embodiment of the invention, the first contact area and / or the second contact area have a protective layer for reducing corrosion. The protective layer is preferably designed as a paint, in particular a conductive paint. According to the invention, it can be provided that the protective layer is made of metal or at least has metal. The protective layer preferably has a lower oxidation susceptibility than iron. The protective layer is further preferably designed to have no effect or only a slight effect on the magnetic flux in the common coil core. The advantage of the protective layer is that it reduces the corrosion of the contact area. Thereby, the wear of the battery system is reduced in a simple device and in a cost-effective manner, and thereby a particularly reliable inductive energy transfer is ensured.

[0025] The first coil core and / or the second coil core particularly preferably have a positioning device for positioning the first coil core relative to the second coil core. The positioning device is, for example, arranged on one side of the respective coil core and is designed to contact the respective other coil core when the individual coil cores are combined into a common coil core. The positioning device is preferably designed as a contact surface or a contact edge, etc. The positioning device is preferably made of a non-magnetic material so that the coil core does not have a negative impact on the magnetic flux. Thereby, the positioning of the coil cores relative to each other is improved in a simple device and in a cost-effective manner.

[0026] The first coil core or the second coil core preferably has a centering device and the respective other second coil core or first coil core (or the respective other coil core, i.e., the second coil core or the first coil core) has a mating centering device, wherein the centering device is designed to engage into the mating centering device. The centering device is, for example, designed as a centering pin and can, for example, have a cylindrical, conical or pyramidal shape. The mating centering device preferably has a complementary shape and size. The mating centering device is therefore preferably designed as a recess. The centering device preferably has a chamfer to improve the engagement of the centering device with the mating centering device. The centering device and the mating centering device are preferably arranged centrally on the contact area of the respective coil core, respectively. This has the advantage that the combination of the first coil core and the second coil core can be improved in a simple device and in a cost-effective manner.

[0027] According to a second aspect of the invention, the technical problem is solved by a motor vehicle. The motor vehicle has an electric motor for driving the motor vehicle, power electronics for operating the electric motor with electrical energy, and an on-board electrical network for distributing electrical energy to the consumers of the motor vehicle. According to the invention, in order to supply electrical energy to the on-board electrical network, the motor vehicle has a battery system according to the invention, wherein the second coil is electrically coupled to the on-board electrical network of the motor vehicle.

[0028] The electrical coupling of the second coil to the on-board electrical system of the motor vehicle is preferably achieved by means of a second inverter. The battery of the battery system is removably held on the motor vehicle, in particular detachably fixed to the motor vehicle. The battery is preferably arranged in the lower region of the motor vehicle and can be removed from the motor vehicle from below by means of an automatic battery replacement device and arranged on the motor vehicle from below.

[0029] In the motor vehicle according to the invention, all the advantages already described for the battery system for a motor vehicle according to the first aspect of the invention are achieved. Thus, the advantages of the motor vehicle according to the invention over conventional motor vehicles are that an electrical coupling can be established between the battery and the on-board electrical system of the motor vehicle in a simple and cost-effective manner. The battery can be replaced on the motor vehicle without thereby damaging the electrical plug contacts. The battery system of the motor vehicle according to the invention is thus designed to be significantly more robust and less subject to wear than known battery systems. In addition, the advantage of forming a common coil core by the mutual contact of the first contact area and the second contact area is that the inductive transfer between the first coil and the second coil, i.e., from the battery to the on-board electrical system, is achieved according to a transformer and thus has lower losses. The availability of the electrical energy stored in the battery is thereby significantly improved.

[0030] The battery system for a motor vehicle according to the invention and the motor vehicle according to the invention are explained in detail below with reference to the drawings. In the drawings, schematically:

[0031] Figure 1 A preferred first embodiment of the battery system according to the invention is shown in a top view,

[0032] Figure 2 A partial view of the battery system according to the invention is shown in a sectional view Figure 1 of

[0033] Figure 3 A part of the battery of a preferred second embodiment of the battery system according to the invention is shown in a perspective view,

[0034] Figure 4 A partial view of a preferred third embodiment of the battery system according to the invention is shown in a sectional view, and

[0035] Figure 5 A preferred embodiment of the motor vehicle according to the invention is shown in a side view.

[0036] In Figures 1 to 5 elements having the same function and mode of operation are each provided with the same reference numerals.

[0037] Figure 1 In a top view, a battery system for a motor vehicle 2 according to the invention is schematically shown (seeFigure 5 ) Preferred first embodiment of the battery system 1. The battery system 1 has a battery 3 which has a plurality of interconnected battery cells 22. On one side of the battery 3, a first inverter 4 is arranged for converting the direct current of the battery 3 into alternating current. At the output of the alternating current side of the first inverter 4, a first coil 5 is connected so that the first coil 5 can be loaded with the generated alternating current. The first coil 5 is wound around a first coil core 8. On two end regions of the first coil core 8, two first contact regions 10 are formed on the same side of the first coil core 8, and the two first contact regions protrude out of the drawing plane in this view. The first coil core 8 is designed in a U shape, wherein the two end portions of the first coil core 8 are respectively defined by the first contact regions 10. Protective layers 16 for corrosion protection are respectively arranged on the first contact regions 10. The battery 3, the first coil 5, the first inverter 4 and the first coil core 8 are surrounded by a battery housing 23, wherein the two lateral partial regions of the first coil core 8 protrude out of the battery housing 23 with the first contact regions 10 arranged thereon. On the battery housing 23, a plurality of locking devices 14 are arranged for detachably fixing the battery 3 to the motor vehicle 2. The battery 3 thus constitutes a separate and replaceable unit of the battery system 1. The battery 3 with zero charge can be easily replaced by a fully charged battery 3 without a laborious and time-consuming charging process.

[0038] In order to transfer the electrical energy of the battery 3 to the on-board electrical network 6 of the motor vehicle 2 (see Figure 5 ), the battery system 1 has a second coil 7 which is wound around a second coil core 9. The second coil 7 is connected to the alternating current side of a second inverter 24. The direct current side of the second inverter 24 is connected to an electrical plug 25 for connection to the on-board electrical network 6. On two end regions of the second coil core 9, two second contact regions 11 are formed on the same side of the second coil core 9, and the two second contact regions point into the drawing plane in this view. The second coil core 9 is designed in an I shape. Protective layers 16 for corrosion protection are respectively arranged on the second contact regions 11. The second coil 7, the second coil core 9 and the second inverter 24 are arranged in a coil housing 12, wherein the coil housing 12 respectively has recesses 13 in the regions of the second contact regions 11. In this embodiment, the second contact regions 11 are retracted from the envelope surface of the coil housing 12 and together with the coil housing 12 form a receiving well for receiving the lateral partial regions of the first coil core 8 together with the first contact regions 10 arranged on the first coil core 8 for contacting the second contact regions 11. The plug 25 is arranged on the coil housing 12. In order to fix the coil housing 12 to the motor vehicle 2, fixing means 26 are arranged laterally on the coil housing 12. The fixing means 26 are exemplarily designed as fixing flanges with fixing perforations.

[0039] Figure 2 A preferred first embodiment of the battery system 1 according to the present invention is schematically shown in a sectional view. In this view, the first coil core 8 and the second coil core 9 are combined such that the first contact region 10 is in complete contact with the second contact region 11. Thereby, a common coil core is formed. Here, a partial region of the first coil core 8 protrudes from the battery housing 23 and protrudes into the recess 13 of the coil housing 12.

[0040] In Figure 3 a partial view of the battery 3 of a preferred second embodiment of the battery system 1 according to the present invention is schematically shown in a perspective view. In this view, the U-shaped shape of the first coil core 8 can be well recognized. The first coil core has two first contact regions 10 and a first coil 5 wound around the first coil core. The first contact region 10 forms a common surface with the battery housing 23 or only slightly protrudes from the battery housing 23 in this second embodiment. The first coil core 8 can be held on the battery housing 23 such that it can move slightly upward relative to the battery housing 23 in this view. A pressure device 15 is arranged below the first coil core 8. The pressure device is used to generate a pressure acting on the first coil core 8 to press the first coil core 8 upward. Thereby, reliable contact between the first contact region 10 and the second contact region 11 can be ensured.

[0041] Figure 4 A partial view of a preferred third embodiment of the battery system 1 according to the present invention is schematically shown in a sectional view. In this preferred third embodiment, the first coil core 8 has orientation devices 17 for orienting the first coil core 8 relative to the second coil core 9 on both sides (or on the sides of both ends) laterally. In addition, the first coil core 8 has centering devices 18 on the two first contact regions 10 respectively. The centering devices are exemplarily designed in a columnar shape. The second coil core 9 has corresponding mating centering devices 19 on the two second contact regions 11. The mating centering devices are designed as columnar recesses in this example. Therefore, the first coil core 8 can be inserted into the second coil core 9.

[0042] Figure 5A preferred embodiment of a motor vehicle 2 according to the invention is schematically shown in a side view. The motor vehicle 2 has an electric motor 20, power electronics 21, an on-board electrical system 6, and a battery system 1 according to the invention, wherein a second coil of the battery system 1 having the second coil core 9 of the battery system 1 is mounted on the motor vehicle 2 and the battery 3 of the battery system 1 is removably held on the motor vehicle 2. A first coil 5 having a first coil core 8 is arranged on the motor vehicle 2 such that the first coil core 8 and the second coil core 9 form a common closed coil core. A pressure device 15 of the battery 3 presses the first coil core 8 onto the second coil core 9 here.

[0043] List of reference numerals

[0044] 1 Battery system

[0045] 2 Motor vehicle

[0046] 3 Battery

[0047] 4 First converter

[0048] 5 First coil

[0049] 6 On-board electrical system

[0050] 7 Second coil

[0051] 8 First coil core

[0052] 9 Second coil core

[0053] 10 First contact area

[0054] 11 Second contact area

[0055] 12 Coil housing

[0056] 13 Recess

[0057] 14 Locking device

[0058] 15 Pressure device

[0059] 16 Protective layer

[0060] 17 Alignment device

[0061] 18 Centering device

[0062] 19 Mate centering device

[0063] 20 Electric motor

[0064] 21 Power electronics

[0065] 22 Battery cell

[0066] 23 Battery housing

[0067] 24 Second converter

[0068] 25 Plug

[0069] 26 Fixing device

Claims

1. A battery system (1) for a motor vehicle (2), the battery system having a battery (3) for supplying electrical energy to the motor vehicle (2), the battery having a first inverter (4) for converting the direct current of the battery (3) into alternating current and a first coil (5) for generating an alternating magnetic field for transferring energy to the motor vehicle (2), the battery system further having a second coil (7) that can be arranged on the motor vehicle (2) and can be electrically coupled to the on-board electrical network (6) of the motor vehicle (2), the second coil being for receiving energy from the first coil (5). Characterized in that the first coil (5) is wound around a first coil core (8) and the second coil (7) is wound around a second coil core (9), wherein the first coil core (8) has a first contact area (10) for mechanically coupling with a second contact area (11) of the second coil core (9) to form a common coil core, and wherein the common coil core is formed by the contact of the first contact area (10) with the second contact area (11).

2. The battery system (1) according to claim 1, Characterized in that the first coil core (8) has two contact areas (10) and the second coil core (9) has two second contact areas (11), wherein the first coil core (8) and the second coil core (9) are designed to form a closed common coil core by the contact of the first contact areas with the second contact areas respectively.

3. The battery system (1) according to claim 1 or 2, Characterized in that the first coil core (8) is designed in a U shape with two first contact areas (10), wherein the second coil core (9) is designed in a U shape or an I shape with two second contact areas (11).

4. The battery system (1) according to claim 1 or 2, Characterized in that the second coil core (9) is arranged in a coil housing (12), wherein the coil housing (12) has recesses (13) in the region of the second contact areas (11) for respectively receiving the first contact areas (10) of the first coil core (8).

5. The battery system (1) according to claim 1 or 2, Characterized in that the battery system (1) has a locking device (14) for temporarily fixing the battery (3) on the motor vehicle (2).

6. The battery system (1) according to claim 1 or 2, Characterized in that the battery system (1) has a pressure device (15) for pressing the first contact area (10) onto the second contact area (11) and / or for pressing the second contact area (11) onto the first contact area (10).

7. The battery system (1) according to claim 1 or 2, Characterized in that the first contact area (10) and / or the second contact area (11) has a protective layer (16) for reducing corrosion.

8. The battery system (1) according to claim 1 or 2, It is characterized in that the first coil core (8) and / or the second coil core (9) has orientation means (17) for orienting the first coil core (8) relative to the second coil core (9).

9. The battery system (1) according to claim 1 or 2, It is characterized in that the first coil core (8) or the second coil core (9) has centering means (18) and the corresponding other second coil core (9) or first coil core (8) has mating centering means (19), wherein the centering means (18) is designed to engage into the mating centering means (19).

10. A motor vehicle (2) having an electric motor (20) for driving the motor vehicle (2), power electronics (21) for operating the electric motor (20) with electrical energy, and a vehicle electrical system (6) for distributing electrical energy to the electrical consumers of the motor vehicle (2), It is characterized in that in order to supply electrical energy to the vehicle electrical system (6), the motor vehicle (2) has a battery system (1) according to one of the preceding claims, wherein a second coil (7) is electrically coupled to the vehicle electrical system (6) of the motor vehicle (2).

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