INDUCTIVE CHARGING DEVICE

Abstract

An inductive charging device for a partially or fully electrically operated motor vehicle is disclosed. The inductive charging device includes a temperature control arrangement including at least one fluid tube, and a charging arrangement including a charging coil and a battery. The charging coil is arranged in a heat-transmitting manner on the at least one fluid tube, such that waste heat generated in the charging coil is transferred to the fluid in the at least one fluid tube. In a charging state of the charging arrangement, the charging coil is inductively coupled with an external primary coil, and in the charging coil an induction alternating current flows, via which the battery is charged. The charging arrangement can be switched to a heating state where the charging coil is connected to the battery in a current-conducting manner and a heating direct current flows in the charging coil.

Claims

1. An inductive charging device for a partially or fully electrically operated motor vehicle, comprising: a temperature control arrangement having at least one fluid tube through which fluid can flow, and a charging arrangement including a charging coil and a battery, the charging coil arranged in a heat-transmitting manner on the at least one fluid tube of the temperature control arrangement, so that the waste heat generated in the charging coil can be transferred to the fluid in the at least one fluid tube of the temperature control arrangement, wherein in a charging state of the charging arrangement the charging coil is inductively coupled with an external primary coil, and in the charging coil an induction alternating current flows, via which the battery of the charging arrangement is charged, the charging arrangement can be switched to a heating state, wherein in the heating state the charging coil is connected to the battery in a current-conducting manner, and in the heating state a heating direct current flows in the charging coil, and the charging coil forms a resistance heating body, wherein the waste heat generated in the charging coil can be transmitted to the fluid in the at least one fluid tube of the temperature control arrangement.

2. The inductive charging device according to claim 1, wherein: the charging arrangement has a direct current converter, and in the heating state the charging coil is connected to the battery in a current-conducting manner via the direct current converter.

3. The inductive charging device according to claim 1, wherein the charging coil is electrically insulated from the at least one fluid tube of the temperature control arrangement.

4. The inductive charging device according to claim 1, wherein the at least one fluid tube of the temperature control arrangement is composed of an electrical insulator and preferably from a plastic.

5. The inductive charging device according to claim 1, wherein: the at least one fluid tube of the temperature control arrangement is electrically conductive and is preferably formed from a metal, and in at least one of the heating state and the charging state the at least one fluid tube of the temperature control arrangement is connected to the battery in a current-conducting manner, and in the at least one fluid tube of the temperature control arrangement at least one of the heating direct current and the induction alternating current flows.

6. The inductive charging device according to claim 1, wherein the charging coil has at least one stranded current conductor with a plurality of current strands, wherein the at least one stranded current conductor is arranged in a heat-transmitting manner on the at least one fluid tube of the temperature control arrangement.

7. The inductive charging device according to claim 6, wherein the plurality of current strands have a diameter at which in the current strands in the charging state at a charging frequency between 20 kHz and 140 kHz a skin effect is minimized.

8. The inductive charging device according to claim 6, wherein one of: the plurality of current strands of the at least one stranded current conductor are wound or braided or cabled or woven around the at least one fluid tube of the temperature control arrangement, the at least one stranded current conductor is secured in the at least one fluid tube of the temperature control arrangement along the temperature control arrangement in a manner able to be flowed around by the fluid, and the charging coil formed from the at least one stranded current conductor is secured in the at least one fluid tube of the temperature control arrangement in a manner able to be flowed around by the fluid.

9. The inductive charging device according to claim 6, wherein the plurality of current strands of the at least one stranded current conductor have an electrical conductivity differing from one another.

10. The inductive charging device according to claim 9, wherein at least one of: in the charging state the current strands of the at least one stranded current conductor with a higher conductivity are connected to the battery in a current-conducting manner, and the induction alternating current flows via these current strands of the at least one stranded current converter, and in the heating state the current strands of the at least one stranded current conductor with a lower conductivity are connected to the battery in a current-conducting manner, and the heating direct current flows via these current strands of the at least one stranded current conductor.

11. The inductive charging device according to claim 6, wherein at least one of: in the heating state the current strands of the at least one stranded current conductor are connected serially to one another, and in the heating state only some of the current strands of the at least one stranded current conductor are connected to the battery in a current-conducting manner, and the heating direct current flows only via these current strands of the at least one stranded current conductor.

12. The inductive charging device according to claim 11, wherein the plurality of current strands of the at least one stranded current conductor are wound or braided or cabled or woven around the at least one fluid tube.

13. The inductive charging device according to claim 11, wherein the at least one current conductor is secured in the at least one fluid tube along the temperature control arrangement in a manner able to be flowed around by the fluid.

14. The inductive charging device according to claim 11, wherein the charging coil is secured in the at least one fluid tube in a manner able to be flowed around by the fluid.

15. The inductive charging device according to claim 2, wherein the charging coil is electrically insulated from the at least one fluid tube.

16. The inductive charging device according to claim 15, wherein the at least one fluid tube is composed of an electrical insulator.

17. The inductive charging device according to claim 16, wherein the at least one fluid tube comprises plastic.

18. The inductive charging device according to claim 5, wherein the at least one fluid tube is composed of a metal.

19-20. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] There are shown, respectively schematically

[0024] FIG. 1 a view of an inductive charging device according to the invention in a charging state;

[0025] FIG. 2 a view of an inductive charging device according to the invention in a heating state;

[0026] FIG. 3 a sectional view of a fluid tube with a stranded current conductor, which is arranged in the fluid tube;

[0027] FIG. 4 a sectional view of a fluid tube with a stranded current conductor, the current strands of which are braided around the fluid tube;

[0028] FIG. 5 a sectional view of a fluid tube with a charging coil, which is formed from a stranded current conductor and is arranged in the fluid tube.

DETAILED DESCRIPTION

[0029] FIG. 1 shows a view of an inductive charging device 1 according to the invention in a charging state LZ. FIG. 2 shows a view of the inductive charging device 1 shown in FIG. 1 in a heating state HZ. The inductive charging device 1 is provided for a motor vehicle and has a temperature control arrangement 2 and a charging arrangement 3. The temperature control arrangement 2 comprises here a fluid tube 4 through which a fluid 5 can flow. The charging arrangement 3 comprises a charging coil 6 with a stranded current conductor 7, and a battery 8. The charging coil 6 is secured to the fluid tube 4 in a heat-transmitting manner, so that the fluid 5 in the fluid tube 4 and the stranded current conductor 7 can exchange heat with one another. Between the charging coil 6 and the battery 8, charging power electronics 9 and heating power electronics 10 are able to be connected in a current-conducting manner. The charging power electronics 9 comprises here a current rectifier 12 and capacitors 13, can however also comprise further elements. The heating power electronics 10 comprises a direct current converter 14 and a capacitor 13, can however also comprise other elements.

[0030] The charging coil 6 is formed by the stranded current conductor 7, which is wound several times around the fluid tube 4. In order to prevent a short circuit in the inductive charging device 1, the charging coil 6therefore the stranded current conductor 7 wound several times around the fluid tube 4is electrically insulated from the fluid tube 4. For this, the fluid tube 4 can have an electrically insulating casing or also can be produced from an electrical insulator. In addition also the stranded current conductor 7 can have an electrically insulating casing. The fluid tube 4 can also be a part of the charging device, for which the fluid tube 4 can be formed from metalfor example copper or aluminiumand in the charging state LZ and in the heating state HZ is acted upon with an induction alternating current IL or with a heating direct current I.sub.H.

[0031] In FIG. 1 the charging coil 6 is connected to the battery 8 via the charging power electronics 9 in a current-conducting manner. The battery 8 can be charged inductively and the induction alternating current I.sub.L flows in the charging coil 6. The waste heat generated in the charging coil 6 is emitted to the fluid 5 in the fluid tube 4 and can be dissipated to the environment or, however, used for preheating a lubricating oil in a motor, for preheating the motor, for preheating the battery or also for preheating an interior of the motor vehicle. In FIG. 2 the charging coil 6 is connected to the battery 8 via the heating power electronics 10 in a current-conducting manner. The heating direct current hi flows in the charging coil 6, and the charging coil 6 acts as a resistance heating body 11. The high waste heat generated in the charging coil 6 is emitted to the fluid 5 in the fluid tube 4 and can be used for heating a lubricating oil in a motor, for heating the motor in a cold stat, for heating the battery or also for heating an interior of the motor vehicle. Through the direct current converter 14, the heating direct current I.sub.H flowing through the charging coil 6 and thereby also the heating output of the charging coil 6 can be adapted. According to the invention, the charging arrangement 3 can be switched into a heating state HZ. For this, a control device can be provided, which is not shown here, however.

[0032] FIG. 3 shows a sectional view of the fluid tube 4 with the stranded current conductor 7, which is arranged in the fluid tube 4. The stranded current conductor 7 has here an electrically insulating casing 15, which electrically insulates current strands 16here only onefrom the fluid 5. Alternatively, the fluid 5 can be electrically non-conducting, so that the electrically insulating casing 15 of the stranded current conductor 7 can be dispensed with. The current strands 16 are dimensioned in such a way that in the charging state LZ at a charging frequency between 20 kHz and 140 kHz a skin effect is minimized. The stranded current conductor 7 in the fluid tube 4 is secured along the latter in a manner able to be flowed around by the fluid 5. The fluid tube 4 then expediently reproduces the shape of the charging coil 6, so that the stranded current conductor 7 arranged along the fluid tube 4 can form the charging coil 6. The waste heat generated in the stranded current conductor 7 is transmitted here directly into the fluid 5.

[0033] FIG. 4 shows a sectional view of the fluid tube 4 with the stranded current conductor 7, the current strands 16 of which are braided around the fluid tube 4. The waste heat generated in the current strands 16 is transmitted via the fluid tube 4. In order to reduce losses of the waste heat, the fluid tube 4 can be formed from a heat-conductive material. The current strands 16 are dimensioned in such a way that in the charging state LZ at a charging frequency between 20 kHz and 140 kHz a skin effect is minimized.

[0034] FIG. 5 shows a sectional view of the fluid tube 4 with the charging coil 6, which is formed from the stranded current conductor 7 and is arranged in the fluid tube 4. The fluid tube 4 forms here a housing for the charging coil 6. Here also the current strand 16 of the stranded current conductor (7) is dimensioned in such a way that in the charging state LZ at a charging frequency between 20 kHz and 140 kHz a skin effect is minimized.

[0035] In summary, in the inductive charging device 1 according to the invention, the charging coil 6 can be used as a resistance heating body 11, so that an additional heating body in the motor vehicle is dispensed with. The charging arrangement 3 is able to be switched into the charging state LZ and into the heating state HZ, so that the charging coil 6, if required, can be used during and also after the charging of the battery 8 in operation of the motor vehicle. The heating output of the charging coil 6 can, in addition, be adapted through the direct current converter 14, and the charging coil 6 can be used, if required, for heating a lubricating oil in a motor, for heating the motor in a cold start, for heating the battery or also for heating an interior of the motor vehicle.