Electric drive device for a vehicle and corresponding vehicle

Abstract

Electric drive device (1) for a vehicle (100), the electric drive device (1) comprising: – a driving section (5) comprising an electric machine (3) and / or a gearbox (4); – an oil circuit (14) configured to guide an oil in a first flow direction (15) through the driving section (5) for cooling and / or lubricating the driving section (5), the oil circuit (14) having an oil sump (16) positioned such that it collects the oil after being guided through the driving section (5); and – an inverter (6) configured to provide a multiphase AC voltage for operating the electric machine (3); wherein the electric drive device (1) is configured to transfer heat generated by the inverter (6) to the oil collected in the oil sump (16).

Description

[0001] Electric drive device for a vehicle and corresponding vehicle

[0002] The present invention relates to an electric drive device for a vehicle, the electric drive device comprising: a driving section comprising an electric machine and / or a gearbox; an oil circuit configured to guide an oil in a first flow direction through the driving section for cooling and / or lubricating the driving section, the oil circuit having an oil sump positioned such that it collects the oil after being guided through the driving section; and an inverter configured to provide a multiphase AC voltage for operating the electric machine.

[0003] Aside, the invention relates to a vehicle.

[0004] EP 4 065 863 A1 discloses a drive device for a vehicle. The drive device comprises an electric machine, a transmission device and an inverter configured to convert a DC voltage into an AC voltage supplying the electric machine. The transmission device comprises an oil sump for lubricating transmission elements.

[0005] In electric drive devices, an oil circuit serves for dissipating heat from components of a driving section and for lubrication of such components. At low outside temperatures, oil transported in the oil circuit has a high viscosity so that a high pressure is required to convey the oil within the circuit. If the flow rate of the oil is too low, the components to be actively lubricated are undersupplied with oil, which leads to increased wear and reduced component lifetime. In addition, the cooling efficiency of the coil circuit decreases. Also, very cold oil has a worse lubricating effect than sufficiently tempered oil.

[0006] It has already been proposed, e.g., in JP S57-159906 A, to temperate the oil in the oil circuit by means of additional heaters. However, such solutions are very energy consuming and require additional components. Thus, it is an object of the invention to provide an improved, in particular more energy-efficient, possibility to optimize the temperature in an oil circuit of an electric drive device.

[0007] The above object is solved by an electric drive device as initially described, wherein the electric drive device is configured to transfer heat generated by the inverter to the oil collected in the oil sump.

[0008] The electric drive device according to the invention is suitable for a vehicle. The electric drive device comprises a driving section, an oil circuit and an inverter. The driving section comprises an electric machine and / or a gearbox. The oil circuit is configured to guide an oil in a first flow direction through the driving section for cooling and / or lubricating the driving section. The oil circuit has an oil sump. The oil sump is positioned such that it collects the oil after being guided through the driving section. The inverter is configured to provide a multiphase AC voltage for operating the electric machine. The electric drive device is configured to transfer heat generated by the inverter to the oil collected in the oil sump.

[0009] The invention is based on the consideration to heat up the oil by thermal losses of the inverter. Due to its high power density and low thermal capacity, the inverter heats up within a very short time span after activating the electric drive device. Thereby, thermal losses to be used for heating up the oil are nearly instantaneously present.

[0010] Advantageously, the oil in the oil sump can be heated up fast so as to reduce its viscosity. This results in a better lubrication performance of the oil and reduced pressure loss, when pumping the oil within the oil circuit. Regarding the pressure loss, smaller pumps can be used and the oil reaches the location, where it shall cool or lubricate, respectively, the driving section, faster. Additionally, this increases efficiency of the entire electric drive. In general, the electric machine may comprise a stator and a rotor. The rotor may be coupled to the gearbox by a main shaft. Preferably, the electric machine is a synchronous motor. The rotor may be electrically or permanently excited. Alternatively, the electric machine may be an induction motor.

[0011] The oil sump may be a single oil sump or may be provided with several separated partial oil sumps. The partial oil sumps may be connected with each other.

[0012] Preferably, the oil circuit comprises a partial oil channel extending around the stator for forming a cooling jacket and / or for forming a spray cooling for a winding head of the stator. Alternatively or additionally, the oil circuit may comprise a partial oil channel extending through the shaft. The or a respective partial oil channel may be arranged downstream the first heat exchanger and upstream the oil sump.

[0013] According to a preferred design, the electric drive device further comprises an inverter cooling channel configured to guide a coolant in a second flow direction and having a first partial channel being configured to dissipate the heat generated by the inverter; and a first heat exchanger arranged in the first cooling circuit downstream the oil sump and in the inverter cooling channel downstream the first partial channel, the first heat exchanger being configured to transfer heat between the oil and the coolant.

[0014] Typically, the coolant guided within the inverter cooling channel contains water and / or glycol. In particular, the coolant is be water or a water-glycol-mixture The second flow direction may realize a counterflow relative to the first flow direction.

[0015] The electric drive device may comprise a coolant inlet for supplying the coolant to the electric drive device. Typically, the coolant is supplied from the outside of the electric drive device so that the inverter cooling channel may form part of a vehicle cooling circuit. Alternatively, the inverter cooling channel may form a closed inverter cooling circuit of the electric drive device. The electric drive device may have a second heat exchanger being arranged in the inverter cooling channel downstream the first partial channel and being in contact with the oil collected in the oil sump so as to transfer the heat generated by the inverter to the oil collected in the oil sump. Accordingly, the inverter cooling channel is guided intendedly along the oil sump so as to allow the second heat exchanger to transfer the heat dissipated from the inverter to the coolant to the oil.

[0016] According to one variant, in the inverter cooling channel, the second heat exchanger may be arranged downstream the first heat exchanger. According to an alternative variant, in the inverter cooling channel, the second heat exchanger is arranged between the first partial channel and the first heat exchanger.

[0017] Preferably, the electric drive device according to the invention comprises a housing accommodating the driving section and the inverter.

[0018] Therein, the oil sump may be arranged below the driving section in a lateral direction and formed by the housing, wherein the housing comprises a bottom section bounding the oil sump in the lateral direction and a side section bounding the oil sump in a transversal direction being perpendicular to the lateral direction. In particular, the electric drive device has a standard alignment used under general operation conditions. In this standard alignment, the oil reaches the oil sump by gravity. That is, in the standard alignment, the lateral direction refers to a vertical direction and the transversal direction to the horizontal direction.

[0019] In the following, four preferred implementation variants are described:

[0020] According to the first variant, the second heat exchanger is formed by the bottom section and / or the side section being formed at least partially in a multi-walled manner so as to guide the coolant between respective wall formed thereby.

[0021] According to the second variant, the second heat exchanger is formed by the bottom section being provided with a second partial channel of the inverter cooling channel. Therein, the second partial channel comprises multiple parallel subchannels or is formed in a meandering manner.

[0022] According to the third variant, the second heat exchanger is formed by a second partial channel of the inverter cooling channel, the second partial channel extending through the oil sump and having an outer surface configured to be in contact with the oil collected in the oil sump. Therein, the second partial channel extends in a straight manner through the oil sump or has a meandering or helical shape. Additionally or alternatively, the inverter cooling channel penetrates the bottom section or the side section at least once for forming the second partial channel inside the oil sump.

[0023] According to the fourth variant, the second heat exchanger is formed by a stack of multiple sheets being stacked from a first side to a second side with regard to a stacking direction of the sheets, each stack being provided with multiple through- holes so as to form a fluid conductive connection from the first side to the second side. Therein, the first side may be attached to the bottom section at a side opposite to the oil sump and the second side is connected to a second partial channel of the inverter cooling channel in fluid-conductive manner.

[0024] According to another implementation variant, the electric drive device according to the invention may comprise a housing accommodating the driving section and the inverter. Therien, the oil sump is arranged below the driving section in a lateral direction and formed by the housing, wherein the housing comprises a bottom section bounding the oil sump in the lateral direction and a side section bounding the oil sump in a transversal direction being perpendicular to the lateral direction, wherein the inverter is attached to the bottom section at a side opposite to the oil sump for forming a heat transfer path through the bottom section. In this variant, the inverter’s heat losses are transported directly through the housing to the oil sump, i.e., independently of an inverter cooling channel. Regarding any housing mentioned before, the housing may be a cast housing made of metal. It should be noted that the inverter cooling channel and / or the oil circuit may be formed partially by cavities formed in the housing. Nonetheless, the inverter cooling channel and / or the oil circuit may be formed partially by separate hoses.

[0025] The above object is further solved by a vehicle, comprising an electric drive device as described afore, wherein the electric drive device is configured to propel the vehicle.

[0026] The vehicle may be a battery electric vehicle. Alternatively, the vehicle may further comprise a combustion engine, so that the vehicle may be considered as hybrid vehicle.

[0027] The vehicle may comprise a vehicle cooling circuit, the inverter cooling channel forming part of the vehicle cooling circuit. Therein, the vehicle may comprise a pump and interfaces to the inlet and the outlet of the inverter cooling channel. The pump may be configured to convey the cooling in the vehicle cooling channel.

[0028] All statements referring to the inventive inverter apply analogously to the inventive electric machine, the inventive vehicle and the inventive method, so that the above-mentioned advantages of the inventive inverter may be achieved as well.

[0029] Further details and advantages of the invention are disclosed in the following, wherein reference is made to the attached drawings. The drawing show schematically:

[0030] Fig. 1 a principle drawing of a first embodiment of the electric drive device according to the invention;

[0031] Fig. 2 a flow diagram of the electric drive device according to the first embodiment; Fig. 3 and 4 each a detailed cross-sectional view of the electric drive device in a region of the second heat exchanger according to the first embodiment;

[0032] Fig. 5 a detailed cross-sectional view of a second embodiment of the electric drive device according to the invention in a region of the second heat exchanger;

[0033] Fig. 6 a detailed cross-sectional view of a third embodiment of the electric drive device according to the invention in a region of the second heat exchanger;

[0034] Fig. 7 a detailed cross-sectional view of a fourth embodiment of the electric drive device according to the invention in a region of the second heat exchanger;

[0035] Fig. 8 a perspective view of the volume of the oil sump and the second heat exchanger according to a fifth embodiment of the electric drive device according to the invention;

[0036] Fig. 9 a detailed cross-sectional view of a sixth embodiment of the electric drive device according to the invention in a region of the second heat exchanger;

[0037] Fig. 10 a flow diagram of further embodiments of the electric drive device according to the invention;

[0038] Fig. 11 a principle drawing of a further embodiment of the electric drive device according to the invention; and Fig. 12 a principle drawing of an embodiment of a vehicle according to the invention.

[0039] Fig. 1 and Fig. 2 each show a first embodiment of an electric drive device 1 , wherein Fig. 1 is a principle drawing showing the electric drive device 1 as seen from the exterior and Fig. 2 is flow diagram.

[0040] The electric drive device 1 comprises a housing 2 having housing parts 2a-d for accommodating several components of the electric drive device 1 , which are shown in detail in Fig. 2.

[0041] The electric drive device 1 comprises an electric machine 3 (accommodated in a machine housing part 2a) and a gearbox 4 (accommodated in a gearbox housing part 2b), which form part of a driving section 5 of the electric drive device 1 . Further, the electric drive device 1 comprises an inverter 6 (accommodated in an inverter housing part 2c) configured to provide a multiphase AC voltage for operating the electric machine 3. Typically, the machine housing part 2a and the gearbox housing part 2b are formed integrally by a single housing structure.

[0042] In more detail, the electric machine 3 comprises a stator 7 and a rotor 8, which is coupled by a main shaft 9 to the gearbox 4. The gearbox 4 comprises gearbox components such as bearings, gear meshes, differential gears and / or seals.

[0043] The main shaft 9 is supported by bearings 10, 11 . A further bearing that supports the main shaft 9 in the gearbox housing part 2b is not depicted so that three bearings for the main shaft 9 may be provided. The main shaft 9 is exemplarily shown as a hollow shaft with a machine-side blind bore. The main shaft 9 may be a single shaft or an assembly of two partial shaft being coupled in a torque-proof manner, e.g. by a splined connection. Therein, one partial shaft may connected to the rotor 8 and one partial shaft may be connected to the gearbox 4 or the gearbox components, respectively. In further detail, the stator 7 comprises a stator core 12, out of which winding heads 13 extend on opposite axial sides of the stator 7. The main shaft 9 and the bearings 10, 11 form part of the driving section 5 as well.

[0044] As can be seen best in Fig. 2, the electric drive device 1 comprises an oil circuit 14 configured to guide an oil in a first flow direction 15 through the driving section 5 for cooling and lubricating the driving section, in particular to cool the electric machine 3 and to lubricate the gearbox 4 and the bearings 10, 1 1. The oil circuit 14 has an oil sump 16 positioned such that it collects the oil after being guided through the driving section 5. In the present embodiment, the oil sump 16 is formed by the housing 2 (housing part 2d).

[0045] In particular detail, the oil circuit 14 comprises a first partial oil channel 17a, which extends around the stator 7 for forming a cooling jacket. The first partial channel 17b also forms a spray cooling for the winding heads 13 by leaking the stator core 7. That is, the oil leaks the first partial coil channel 17a at opposite face sides of the stator core 7 for cooling the winding heads 13 and is collected in the oil sump 16. Further, the oil circuit 14 comprises a second partial channel 17b extending through the main shaft 9. The second partial channel 17b lubricates and cools the gearbox 4 or the gearbox components, respectively. Subsequently, the second partial channel 17b may cool the connection between the partial shafts. Subsequently, the second partial channel 17b cools the rotor 8 and lubricates the bearings 10, 11. That is, the oil leaks the main shaft 9 and is collected in the oil sump 16.

[0046] In further detail, in the oil circuit 14, the oil flows from the oil sump 16 with regard to the first flow direction 15 through a prefilter 18, a pump 19 for conveying the oil along the first flow direction 15, a main filter 20 and a first heat exchanger 21 and then into the driving section 5. That is, the first heat exchanger 21 is arranged downstream to oil sump 16. For supplying the partial channels 17a, 17b, the oil circuit 14 is provided with a splitter 22, which splits the oil circuit 14 into the partial channels 17a, 17b. Alternatively, the main filter 20 may be arranged upstream the pump 19 for realizing a suction filter, which eliminates the need for the prefilter 18.

[0047] The electric drive device 1 further comprises an inverter cooling channel 23. The inverter cooling channel 23 is configured to guide a coolant, e.g. water or a water- glycol-mixture, in a second flow direction 24 and has a first partial channel 25 being configured to dissipate the heat generated by the inverter 6. The first heat exchanger 21 is arranged in the in the inverter cooling channel 23 downstream the first partial channel 25 and configured to transfer heat between the oil and the coolant.

[0048] The electric drive device 1 has a second heat exchanger 26 (indicated merely schematically in Fig. 2), which is arranged in the inverter cooling channel 23 downstream the first partial channel 25 and, in the present embodiment, downstream the first heat exchanger 21 . The second heat exchanger is in contact with the oil collected in the oil sump 16 so as to transfer the heat generated by the inverter 6 to the oil collected in the oil sump 16.

[0049] In particular detail, the inverter cooling channel 23 is supplied externally with the coolant, i.e., the electric drive device 1 comprises an inlet 27 and an outlet 28 formed in the housing 2. Accordingly, a pump 102 is disposed outside the electric drive device 1 and the inverter cooling channel 23 forms part of a vehicle cooling circuit 101 (see Fig. 12).

[0050] As can be seen in further detail in Fig. 1 and Fig. 2, the oil sump 16 is arranged below the driving section 5 in a lateral direction 29. The housing 2 comprises a bottom section 30 bounding the oil sump in the lateral direction 29 and a side section 31 bounding the oil sump 16 in transversal directions 32 being perpendicular to the lateral direction 29. The electric drive device 1 has a standard alignment used under general operation conditions, in which the oil reaches the oil sump 16 by gravity. That is, in the standard alignment, the lateral direction 29 refers to a vertical direction and the transversal direction 32 to the horizontal direction. Fig. 3 and Fig. 4 each show a detailed cross-sectional view of the electric drive device 1 according to the first embodiment in a region of the second heat exchanger 26, wherein in Fig. 3 a sectional plane is perpendicular to the lateral direction 29 and in Fig. 4 a sectional plane extends along the lateral direction 29.

[0051] According to the first embodiment, the second heat exchanger 26 is formed by the bottom section 30 and the side section 31 being formed in a multi-walled manner so as to guide the coolant between respective walls 33a, 33b formed thereby. Therein, inner walls being in contact with the oil collected in the oil sump 16 are denoted by reference numeral 33a and opposite outer walls by reference numeral 33b.

[0052] In the following, further embodiments of an electric drive device 1 are described. Therein, equal or equivalent components with regard to the first embodiment are denoted by the same reference numerals.

[0053] Fig. 5 is a detailed cross-sectional view of a second embodiment of an electric drive device 1 in a region of the second heat exchanger 26. Therein, a sectional plane is perpendicular to the lateral direction 29. The second embodiment corresponds to the first embodiment so that only distinguishing features are described in the following.

[0054] According to the second embodiment, the second heat exchanger 26 is formed by the bottom section 30, through which the sectional plane extends, being provided with a second partial channel 34 of the inverter cooling channel 23. That is, the oil sump 16 (as indicated by dashed lines) is arranged above the second partial channel 34 with regard to the lateral direction 29. The second partial channel 34 comprises multiple parallel subchannels 35.

[0055] Fig. 6 is a detailed cross-sectional view of a third embodiment of an electric drive device 1 in a region of the second heat exchanger 26. Therein, a sectional plane is perpendicular to the lateral direction 29 as in Fig. 5. The third embodiment corresponds to the second embodiment so that only distinguishing features are described in the following.

[0056] According to the third embodiment, the second partial channel 34 is formed in a meandering manner. In particular, subchannels 35 as shown in Fig. 5 are omitted.

[0057] Fig. 7 is a detailed cross-sectional view of a fourth embodiment of an electric drive device 1 in the region of the second heat exchanger 26. Therein, a sectional plane extends along the lateral direction 29. The fourth embodiment corresponds to the first embodiment so that only distinguishing features are described in the following.

[0058] According to the fourth embodiment, the second heat exchanger 26 is formed by a second partial channel 34 of the inverter cooling channel 23. The second partial channel 34 extends in straight manner through the oil sump 16 and has an outer surface 36 configured to be in contact with the oil collected in the oil sump 16.

[0059] Therein, the inverter cooling channel 23 penetrates the side section 31 twice for forming the second partial channel 34 inside the oil sump. Alternatively, the inverter cooling channel may penetrate the bottom section 30 (not shown).

[0060] Fig. 8 is a perspective view of the volume of the oil sump 16 and the second heat exchanger 26 according to a fifth embodiment of an electric drive device 1 . The fifth embodiment corresponds to the fourth embodiment so that only distinguishing features are described in the following.

[0061] According to the fifth embodiment, the second partial channel 34 of the inverter cooling channel 23 has a helical shape.

[0062] Fig. 9 is a detailed cross-sectional view of a sixth embodiment of an electric drive device 1 in the region of the second heat exchanger 26. A sectional plane extends along the lateral direction 29. The sixth embodiment corresponds to the first embodiment so that only distinguishing features are described in the following. According to the sixth embodiment, the second heat exchanger 26 is formed by a stack 37 of multiple sheets 38 being stacked from a first side 39 to a second side 40 with regard to a stacking direction 41 of the sheets 38. Each sheet 38 is provided with multiple through-holes 42 so as to form a fluid conductive connection from the first side 39 to the second side 40. The first side 39 is attached to the bottom section 30 at a side opposite to the oil sump 16 and the second side 40 is connected to a second partial channel 34 of the inverter cooling channel 23 in a fluid-conductive manner. That is, contrarily to the afore-said embodiments, the second heat exchanger 26 is disposed outside the housing 2, in particular attached thereto.

[0063] Fig. 10 is a flow diagram of further embodiments of an electric drive device 1 . The further embodiments may correspond to any of the afore-said embodiments so that only distinguishing features are described in the following.

[0064] In the inverter cooling channel 23, the second heat exchanger 26 is arranged between the first partial channel 25 and the first heat exchanger 21 . That is, the first heat exchanger 21 is arranged downstream the first partial channel 25 and the second heat exchanger 26.

[0065] Fig. 1 1 is a principle of further embodiment of an electric drive device 1 . The further corresponds to the first embodiment so that only distinguishing features are described in the following.

[0066] According to this embodiment, the inverter 6 is attached to the bottom section 30 at a side opposite to the oil sump 16 for forming a heat transfer path through the bottom section 30 in order to transfer heat generated by the inverter 6 to the oil collected in the oil sump 16. That is, with regard to the lateral direction 29 the inverter (and the corresponding housing part 2c) is arranged below oil sump 16 and below the driving section 5. In particular, in the present embodiment, the heat transfer from the inverter 6 to the oil sump 16 is substantially independent from the inverter cooling channel 23, which may be provided in this embodiment, and the second heat exchanger 26 is omitted.

[0067] Fig. 12 is a principle drawing of an embodiment of a vehicle 100.

[0068] The vehicle 100 comprises an electric drive device 1 according to one of the above embodiments or obtained by the above manufacturing method. The electric drive 1 is configured to propel the vehicle 100.

[0069] The vehicle 100 comprises a vehicle cooling circuit 101 having a pump 102 for the coolant and interfaces to the inlet 27 and the outlet 28 of the electric drive device 1 so as to form the vehicle cooling circuit 101 .

[0070] Moreover, the electric vehicle 100 comprises wheels 103 being directly or indirectly, e.g., via a transmission, coupled with the electric drive devicel so as to rotate the wheels 103. According to the embodiment, the electric vehicle 100 is a battery electric vehicle (BEV). Alternatively, the electric vehicle 100 may additionally comprise a combustion engine, therein forming a hybrid vehicle. Further, the electric vehicle 100 may comprise a fuel cell supplying the electric drive device 1 .

Claims

Claims1 . Electric drive device (1 ) for a vehicle (100), the electric drive device (1 ) comprising: a driving section (5) comprising an electric machine (3) and / or a gearbox (4); an oil circuit (14) configured to guide an oil in a first flow direction (15) through the driving section (5) for cooling and / or lubricating the driving section (5), the oil circuit (14) having an oil sump (16) positioned such that it collects the oil after being guided through the driving section (5); and an inverter (6) configured to provide a multiphase AC voltage for operating the electric machine (3); characterized in that the electric drive device (1 ) is configured to transfer heat generated by the inverter (6) to the oil collected in the oil sump (16).

2. Electric drive device according to claim 1 , further comprising: an inverter cooling channel (23) configured to guide a coolant in a second flow direction (24) and having a first partial channel (25) being configured to dissipate the heat generated by the inverter (6); and a first heat exchanger (21 ) arranged in the oil circuit (14) downstream the oil sump (16) and in the inverter cooling channel (23) downstream the first partial channel (25), the first heat exchanger (21 ) being configured to transfer heat between the oil and the coolant; wherein the electric drive device (1 ) has a second heat exchanger (26) being arranged in the inverter cooling channel (23) downstream the first partial channel (25) and being in contact with the oil collected in the oil sump (16) so as to transfer the heat generated by the inverter (6) to the oil collected in the oil sump (16).

3. Electric drive device according to claim 2, wherein,in the inverter cooling channel (23), the second heat exchanger (26) is arranged downstream the first heat exchanger (21 ).

4. Electric drive device according to claim 2, wherein, in the inverter cooling channel (23), the second heat exchanger (26) is arranged between the first partial channel (25) and the first heat exchanger (21).

5. Electric drive device according to any of the preceding claims, further comprising a housing (2) accommodating the driving section (5) and the inverter (6); wherein the oil sump (16) is arranged below the driving section (5) in a lateral direction (29) and formed by the housing (2), wherein the housing (2) comprises a bottom section (30) bounding the oil sump (16) in the lateral direction (29) and a side section (31 ) bounding the oil sump (16) in a transversal direction (32) being perpendicular to the lateral direction (29).

6. Electric drive device according to claim 5, wherein the second heat exchanger (26) is formed by the bottom section (30) and / or the side section (31 ) being formed at least partially in a multi-walled manner so as to guide the coolant between respective walls (33a, 33b) formed thereby.

7. Electric drive device according to claim 5, wherein the second heat exchanger (26) is formed by the bottom section (30) being provided with a second partial channel (34) of the inverter cooling channel (23).

8. Electric drive device according to claim 7, wherein the second partial channel (34) comprises multiple parallel subchannels (35) or is formed in a meandering manner.

9. Electric drive device according to claim 5, wherein the second heat exchanger (26) is formed by a second partial channel (34) of the inverter cooling channel (23), the second partial channel (34) extending throughthe oil sump (14) and having an outer surface (36) configured to be in contact with the oil collected in the oil sump (16).

10. Electric drive device according to claim 9, wherein the second partial channel (34) extends in a straight manner through the oil sump (16) or has a meandering or helical shape.11 . Electric drive device according to claim 9 or 10, wherein the inverter cooling channel (23) penetrates the bottom section (30) or the side section (31 ) at least once for forming the second partial channel (34) inside the oil sump (16).

12. Electric drive device according to claim 5, wherein the second heat exchanger (26) is formed by a stack (37) of multiple sheets (38) being stacked from a first side (39) to a second side (40) with regard to a stacking direction of the sheets (41 ), each sheet (38) being provided with multiple through- holes (42) so as to form a fluid conductive connection from the first side (39) to the second side (40), wherein the first side (39) is attached to the bottom section (30) at a side opposite to the oil sump (16) and the second side (40) is connected to a second partial channel (34) of the inverter cooling channel (23) in a fluid-conductive manner.

13. Electric drive device according to claim 1 , further comprising a housing (2) accommodating the driving section (5) and the inverter (6); wherein the oil sump (16) is arranged below the driving section (5) in a lateral direction (29) and formed by the housing (2), wherein the housing (2) comprises a bottom section (30) bounding the oil sump (16) in the lateral direction (29) and a side section (31 ) bounding the oil sump (16) in a transversal direction (32) being perpendicular to the lateral direction (29), wherein the inverter (6) is attached to the bottom section (30) at a side opposite to the oil sump (16) for forming a heat transfer path through the bottom section (30).

14. Electric drive device according to any of the preceding claims, wherein the electric machine (3) comprises a stator (7) and a rotor (8), the rotor (8) being coupled by a main shaft (9) to the gearbox (4), wherein the oil circuit (14) comprises a partial oil channel (17a) extending around the stator (7) for forming a cooling jacket and / or for forming a spray cooling for a winding head (13) of the stator (7); and / or a partial oil channel (17b) extending through the shaft (9); wherein the or a respective partial oil channel (17a, b) is arranged downstream the first heat exchanger (21 ) and upstream to oil sump (16).

15. Vehicle (100), comprising an electric drive device (1 ) according to any of the preceding claims, wherein the electric drive device (1 ) is configured to propel the vehicle (100).

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