Battery device for a motor vehicle, motor vehicle, and method for operating a battery device

Abstract

A battery device (100) for a motor vehicle (200) is proposed, comprising: a first battery module (1) having a first housing (5.1); a second battery module (2) having a second housing (5.2) arranged adjacent to the first battery module (1) in a first direction (X); a coolant channel (12) and a battery module connector (13) arranged in the coolant channel (12) for electrically contacting the first and second battery modules (1, 2), wherein the first and second housings (5.1, 5.2) have coolant inlet openings (10) at opposite end sides (5') in a second direction (Y) arranged orthogonal to the first direction (X), and a coolant outlet opening (11) arranged centrally on the first or second housing (5.1, 5.2) relative to the second direction (Y) and leading into the coolant channel (12). A method for operating the battery device (100) and a motor vehicle (200) are also described.

Description

Technical Field

[0001] The present invention relates to a battery device for a motor vehicle and a motor vehicle, the battery device comprising: a first battery module having a first housing; a second battery module having a second housing and arranged adjacent to the first battery module in a first direction; a coolant channel and a battery module connector arranged in the coolant channel for electrically contacting the first battery module and the second battery module. The present invention also relates to a method for operating such a battery device. Background Art

[0002] Battery systems for motor vehicles, in particular those used to supply electrical energy to the traction drive of a motor vehicle, generate heat during operation. To achieve a long service life for the battery system, this heat must be dissipated. Liquid cooling has proven to be very effective in this regard. Typically, a liquid coolant is applied to thermal contacts, which are thermally connected to the battery cells, for example, by means of thermally conductive paste. Alternatively or additionally, a liquid, non-conductive coolant can be applied directly to the battery modules or battery cells, which can significantly increase the cooling capacity.

[0003] Typically, a battery device is constructed from a plurality of battery modules, which in turn include at least one battery cell stack having a plurality of battery cells. These battery modules are electrically connected by means of battery module connectors, so that all battery modules can be charged and discharged via the common electrical connection terminals of the battery device.

[0004] During operation of a battery device, waste heat is generated not only in the battery cells but also in the battery module connectors (e.g., due to ohmic losses). This is also disadvantageous because the heat generated in the battery module connectors can be transferred to the battery cells by thermal conduction, thereby increasing the ohmic resistance of the battery module connectors and shortening their service life.

[0005] It is known from the prior art to cool not only the battery cells but also the battery module connectors. For example, CN 108 232 361A discloses a battery arrangement for a motor vehicle in which coolant is directed into the battery modules and out again via coolant channels in which busbars are arranged. This cools not only the battery modules but also the busbars electrically connected to the battery modules.

[0006] A disadvantage here is that it is not taken into account that the battery modules require a higher cooling power than the busbars. Cooling the battery modules with a coolant that has already been heated by the busbars is inefficient. Summary of the Invention

[0007] Therefore, the object of the present invention is to provide a battery arrangement which does not have the above-mentioned disadvantages of the prior art, but rather allows efficient cooling of the battery arrangement, in which the requirements of the components of the battery arrangement for the available cooling power are taken into account.

[0008] This object is achieved by a battery device for a motor vehicle, which comprises: a first battery module having a first shell; a second battery module having a second shell arranged adjacent to the first battery module in a first direction; a coolant channel and a battery module connector arranged in the coolant channel for electrically contacting the first battery module and the second battery module, wherein the first shell and the second shell have coolant inlet openings at opposite end sides in a second direction arranged respectively orthogonal to the first direction and respectively have a coolant outlet opening arranged in the center of the first shell or the second shell relative to the second direction and leading to the coolant channel.

[0009] In the battery device according to the present invention, coolant is supplied to the battery module laterally via the side walls. Since the coolant inlet openings are located at two opposite end sides of the housing, these end sides are the outside. The coolant can flow from the outside of the battery module through the battery module to the center, cool the battery module, and then be directed to the battery module connector through the centrally arranged coolant outlet opening. That is, the coolant first cools the battery module and then cools the battery module connector, thereby providing the battery module with optimally temperature-controlled coolant. Since this applies not only to the first battery module, but also to the second battery module, they have the same requirements, so that the cooling power does not decrease from the first battery module to the second battery module by connecting the cooling device in the middle via the battery module connector.

[0010] It is conceivable that the battery device includes further battery modules having the same features as the first battery module and / or the second battery module. It is conceivable that the first housing and / or the second housing and / or the coolant channel are made of plastic, in particular of electrically insulating plastic. It is also conceivable that the first housing and / or the second housing and / or the coolant channel have a structure made of metal (in particular aluminum). For this purpose, it is conceivable that the first housing and / or the second housing and / or the coolant channel have other structures for electrically insulating from the first housing or the second housing or the coolant channel. For this purpose, it is conceivable, for example, that the first housing and / or the second housing and / or the coolant channel have a sandwich structure consisting of metal and an insulating material (e.g. plastic).

[0011] Advantageous embodiments and developments of the invention can be gathered from the following description with reference to the accompanying drawings.

[0012] According to a preferred embodiment of the present invention, the coolant channel has a main extension along the first direction. As a result, the coolant channel advantageously extends centrally along the battery modules arranged one behind the other (relative to the main extension direction of the coolant channel). Electrical contact between the battery modules and the battery module connectors preferably also establishes a mechanical connection between the battery modules, which can significantly increase the mechanical stability of the battery arrangement.

[0013] According to another preferred embodiment of the present invention, the end sides are mechanically reinforced, wherein these end sides are preferably thicker than the walls of the remaining housing sides and / or have reinforcing ribs and / or are made of a stronger material than the remaining housing sides. This advantageously allows the battery device to absorb the input kinetic energy in the event of an accident and to dissipate and dissipate it in a targeted manner. This is particularly true in the event of a side impact if the coolant channels are arranged in the direction of travel.

[0014] According to another preferred embodiment of the present invention, the battery module connector includes a busbar, wherein the busbar is preferably arranged along a first direction. This enables a stable electrical connection of the battery module while simultaneously minimizing ohmic losses. Preferably, the busbar is made of copper, aluminum, or a metal alloy comprising copper and / or aluminum.

[0015] According to another preferred embodiment of the present invention, a first battery module includes a first battery cell stack and another first battery cell stack, wherein the first battery cell stack and the other first battery cell stack are arranged side by side in a first housing relative to a second direction, and a second battery module includes a second battery cell stack and another second battery cell stack, wherein the second battery cell stack and the other second battery cell stack are arranged side by side in a second housing relative to the second direction. This advantageously enables the arrangement of battery cell stacks on the left and right sides of a centrally arranged coolant channel.

[0016] According to another preferred embodiment of the present invention, coolant lines are arranged on the bottom sides of the first battery cell stack, another first battery cell stack, the second battery cell stack, and another second battery cell stack, and on the top sides of the first battery cell stack, another first battery cell stack, the second battery cell stack, and another second battery cell stack, opposite the bottom sides. The coolant lines are used to guide the coolant in a second direction. This advantageously enables targeted guidance of the coolant along the top and bottom sides of the battery cell stacks and cooling of the battery cell stacks. It is preferably provided that the coolant is applied directly to the top and bottom sides. For this purpose, it is preferably provided that the coolant is a dielectric coolant, in particular oil. It is also conceivable that heat-conducting elements thermally connected to the battery cells are arranged on the top and bottom sides of the battery cell stacks. For example, it is conceivable that the heat-conducting elements have a fin structure and / or a rib structure. It is conceivable that the heat-conducting elements are dielectric.

[0017] According to another preferred embodiment of the present invention, additional coolant lines are arranged between the battery cells of a first battery cell stack, another first battery cell stack, a second battery cell stack, and another second battery cell stack, and these additional coolant lines are used to guide the coolant in a second direction. By using multiple (preferably parallel) additional coolant lines along the second direction, more efficient cooling can be achieved. To this end, the battery cells are stacked on top of each other along a third direction that is orthogonal to the first and second directions. Preferably, these additional coolant lines are provided between all the battery cells in the battery cell stack.

[0018] According to another preferred embodiment of the present invention, additional coolant lines are arranged between the battery cells of the first battery cell stack, another first battery cell stack, the second battery cell stack and another second battery cell stack, and these additional coolant lines are used to guide the coolant along a third direction orthogonal to the first direction and the second direction. More efficient cooling can also be achieved by using multiple (preferably parallel) additional coolant lines along the third direction. To this end, the battery cells are stacked or arranged one another along the first direction or along the second direction. Preferably, these additional coolant lines are arranged between all the battery cells of the battery cell stack. It is conceivable that the coolant line and the additional coolant line are designed to guide the coolant in a tortuous manner through the battery cell stack.

[0019] According to another preferred embodiment of the present invention, closure elements for fluid-tightly closing the coolant lines are arranged on the top sides of the first, second, and third battery cell stacks, facing the end sides, and on the bottom sides, facing the inside, of the coolant lines. Alternatively, closure elements for fluid-tightly closing the coolant lines are arranged on the bottom sides, facing the outside, and on the top sides, facing the inside, of the first, second, and third battery cell stacks. This forces the coolant to flow along a longer path along the battery cell stacks. This prevents coolant from flowing directly along the coolant lines to the coolant outlet openings without flowing through further coolant lines. This also prevents heated coolant in further coolant lines from flowing back into the coolant inlet openings, thereby preventing heated coolant from flowing back through the battery cell stacks.

[0020] According to another preferred embodiment of the present invention, coolant channels are arranged (preferably welded and / or glued) on the top sides of the first and second housings and outside the interior space, with a portion of the battery module connector preferably arranged in the interior space, and a portion of the battery module connector preferably arranged in the coolant channels, with the busbars particularly preferably arranged in the coolant channels. This advantageously achieves spatial separation of cooling for the battery cell stack and the busbars. Furthermore, the coolant channels, which are arranged flat on top, significantly simplify assembly of the battery device.

[0021] To achieve the objectives stated at the outset, another subject matter of the present invention is a motor vehicle having a battery arrangement according to the present invention. The battery arrangement is preferably a battery arrangement for supplying electrical energy to the traction drive of the motor vehicle. The motor vehicle is preferably a partially electrically driven motor vehicle (i.e., a so-called hybrid vehicle having an electric drive machine and a combustion engine) or a fully electrically driven motor vehicle. For this purpose, it is preferably provided that the first direction is arranged along the longitudinal axis of the motor vehicle and the second direction is arranged along the transverse axis of the motor vehicle.

[0022] According to another preferred embodiment of the present invention, the battery arrangement is arranged with its end facing the floor beams of the motor vehicle. Preferably, the battery arrangement extends from one floor beam to the other. Within the meaning of the present invention, these floor beams are lateral floor beams of the motor vehicle body. This advantageously achieves good space utilization.

[0023] The present invention also relates to a method for operating a battery device of a motor vehicle, the battery device comprising: a first battery module having a first housing; a second battery module having a second housing and arranged adjacent to the first battery module in a first direction; a coolant channel and a battery module connector arranged in the coolant channel for electrically contacting the first battery module and the second battery module, wherein the first housing and the second housing have coolant inlet openings at opposite end sides in a second direction arranged orthogonally to the first direction, through which coolant flows into the corresponding housing, and wherein the first housing and the second housing (5.1, 5.2) respectively have a coolant outlet opening (11) arranged centrally on the first housing or the second housing (5.1, 5.2) relative to a second direction (Y) and leading to the coolant channel (12), through which coolant flows out of the corresponding housing (5.1, 5.2).

[0024] The advantages already described in conjunction with the battery arrangement can also be achieved in a vehicle and in a method for operating a battery arrangement.

[0025] It is preferably provided that the battery arrangement is a battery arrangement according to the invention.

[0026] All details, features and advantages disclosed above in conjunction with the battery arrangement according to the invention also relate to the motor vehicle according to the invention and to the method according to the invention.

[0027] In general, the present invention discloses the following technical solutions 1, 11 and 14, and the following 2-10 and 12-13 are preferred technical solutions:

[0028] 1. A battery device (100) for a motor vehicle (200), the battery device comprising:

[0029] A first battery module (1) having a first housing (5.1);

[0030] a second battery module (2) arranged adjacent to the first battery module (1) in a first direction (X) and having a second housing (5.2);

[0031] coolant passages (12), and

[0032] a battery module connector (13) arranged in the coolant channel (12) for electrically contacting the first battery module and the second battery module (1, 2),

[0033] It is characterized in that

[0034] The first housing and the second housing (5.1, 5.2) have coolant inlet openings (10) at opposite end sides (5') in a second direction (Y) arranged orthogonally to the first direction (X), and respectively have coolant outlet openings (11) arranged centrally on the first housing or the second housing (5.1, 5.2) relative to the second direction (Y) and leading to the coolant channel (12).

[0035] 2. The battery device (100) according to item 1 above, characterized in that the coolant channel (12) has a main extension direction along the first direction (X).

[0036] 3. A battery device (100) according to any one of 1-2 above, characterized in that the end side (5') is mechanically reinforced, wherein the end side (5') is preferably thicker than the wall of the other sides of the shell (5.1, 5.2) and / or has reinforcing ribs and / or is made of a material that is stronger than the other sides of the shell (5.1, 5.2).

[0037] 4. The battery device (100) according to any one of 1-3 above, characterized in that the battery module connector (13) has a busbar (13.1), wherein the busbar (13.1) is preferably arranged along the first direction (X).

[0038] 5. The battery device (100) according to any one of 1 to 4 above, characterized in that the first battery module (1) has a first battery cell stack (6) and another first battery cell stack (7), wherein the first battery cell stack and the another first battery cell stack (6, 7) are arranged side by side in the first housing (5.1) relative to the second direction (Y),

[0039] The second battery module (2) has a second battery cell stack (8) and another second battery cell stack (9), wherein the second battery cell stack and the another second battery cell stack (8, 9) are arranged side by side in the second housing (5.2) relative to the second direction (Y).

[0040] 6. The battery device (100) according to the aforementioned 5 is characterized in that a coolant line (14) is arranged on the bottom side (6.1, 7.1) of the first battery cell stack, the other first battery cell stack, the second battery cell stack and the other second battery cell stack (6, 7, 8, 9) and on the top side (6.2, 7.2) of the first battery cell stack, the other first battery cell stack, the second battery cell stack and the other second battery cell stack (6, 7, 8, 9) opposite to the bottom side (6.1, 7.1), and the coolant line is used to guide the coolant along the second direction (Y).

[0041] 7. The battery device (100) according to the aforementioned 6 is characterized in that an additional coolant line (15) is arranged between the battery cells (6', 7', 8', 9') of the first battery cell stack, the other first battery cell stack, the second battery cell stack and the other second battery cell stack (6, 7, 8, 9), and the additional coolant line is used to guide the coolant along the second direction (Y).

[0042] 8. The battery device (100) according to the aforementioned 6 is characterized in that an additional coolant line (15) is arranged between the battery cells (6', 7') of the first battery cell stack, the another first battery cell stack, the second battery cell stack and the another second battery cell stack (6, 7, 8, 9), and the additional coolant line is used to guide the coolant along a third direction (Z) orthogonal to the first direction (X) and the second direction (Y).

[0043] 9. The battery device (100) according to the aforementioned 8 is characterized in that, in the coolant line (14), a closing element (16) for fluid-tightly closing the coolant line (14) is arranged on the top side (6.2, 7.2) at the outer side (6.3, 7.3) of the first battery cell stack, the further first battery cell stack, the second battery cell stack and the further second battery cell stack (6, 7, 8, 9) facing the end side (5'), and on the bottom side (6.1, 7.1) at the inner side (6.4, 7.4) opposite to the outer side (6.3, 7.3), or

[0044] In the coolant line (14), a closing element (16) for closing the coolant line (14) in a fluid-tight manner is arranged on the bottom side (6.1, 7.1) at the outside (6.3, 7.3) of the first battery cell stack, the further first battery cell stack, the second battery cell stack and the further second battery cell stack (6, 7, 8, 9), and on the top side (6.2, 7.2) of the inside (6.4, 7.4).

[0045] 10. A battery device (100) according to any one of 1 to 9 above, characterized in that the coolant channel (12) is arranged, preferably welded, glued and / or screwed, outside the top side (5") and the interior space (5"') of the first shell and the second shell (5.1, 5.2), wherein a part of the battery module connector (13) is preferably arranged in the interior space (5"') and a part of the battery module connector (13) is preferably arranged in the coolant channel (12), wherein the busbar (13.1) is particularly preferably arranged in the coolant channel (12).

[0046] 11. A motor vehicle (200) comprising a battery device (100) according to any one of the above 1 to 10.

[0047] 12. The motor vehicle (200) according to claim 11 above, characterized in that the first direction (X) is arranged along the longitudinal axis (x) of the motor vehicle (200), and the second direction (Y) is arranged along the transverse axis (y) of the motor vehicle (200).

[0048] 13. The motor vehicle (200) according to the above 12, characterized in that the end side (5') is arranged toward the bottom beam (201) of the motor vehicle (200).

[0049] 14. A method for operating a battery arrangement (100) of a motor vehicle (200), the battery arrangement comprising:

[0050] A first battery module (1) having a first housing (5.1);

[0051] a second battery module (2) arranged adjacent to the first battery module (1) in a first direction (X) and having a second housing (5.2);

[0052] coolant passages (12), and

[0053] a battery module connector (13) arranged in the coolant channel (12) for electrically contacting the first battery module and the second battery module (1, 2),

[0054] The first housing and the second housing (5.1, 5.2) have coolant inlet openings (10) at opposite end sides (5') in a second direction (Y) arranged orthogonally to the first direction (X), and the coolant flows into the corresponding housing (5.1, 5.2) through the coolant inlet openings.

[0055] The first housing and the second housing (5.1, 5.2) respectively have a coolant outlet opening (11) arranged centrally on the first housing or the second housing (5.1, 5.2) relative to the second direction (Y) and leading to the coolant channel (12), and the coolant flows out of the corresponding housing (5.1, 5.2) through the coolant outlet opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Further details, features and advantages of the invention will be apparent from the drawings and the following description of preferred embodiments with reference to the drawings. These drawings merely illustrate exemplary embodiments of the invention and do not restrict the inventive concept.

[0057] Figure 1 A battery device according to an exemplary embodiment of the present invention is schematically illustrated.

[0058] Figure 2 A battery device according to an exemplary embodiment of the present invention is schematically illustrated.

[0059] Figure 3 A battery device according to an exemplary embodiment of the present invention is schematically illustrated.

[0060] Figure 4 A motor vehicle according to an exemplary embodiment of the invention is schematically illustrated. DETAILED DESCRIPTION

[0061] Figure 1 From the perspective of the third direction (see Figure 1 ), a battery arrangement 100 according to an exemplary embodiment of the present invention is schematically shown from above. A first battery module 1, a second battery module 2, a third battery module 3 and a fourth battery module 4 can be seen. The battery modules 1, 2, 3, 4 are arranged side by side in a first direction X, which is oriented orthogonally to the third direction. The battery arrangement 100 is for a motor vehicle (see Figure 4 ) battery device 100. A motor vehicle floor beam 201 is arranged adjacent to battery modules 1, 2, 3, and 4 in a second direction Y, perpendicular to the first and third directions X. Battery modules 1, 2, 3, and 4 have housings. The first housing 5.1 of the first battery module 1 and the second housing 5.2 of the second battery module 2 are shown.

[0062] Arranged in the housings 5.1, 5.2 of the battery modules 1, 2, 3, 4 are a first battery cell stack 6 and a further first battery cell stack 7 of the first battery module 6, a second battery cell stack 8 and a further second battery cell stack 9 of the second battery module 2, a third battery cell stack 8' and a further third battery cell stack 9' of the third battery module 3, as well as a fourth battery cell stack 8" and a further fourth battery cell stack 9" of the fourth battery module 4.

[0063] In order to cool the battery cell stacks 6, 7, 8, 8', 8", 9, 9', 9", the end sides 5' of the housings 5.1, 5.2 facing the base member 201 have coolant inlet openings 10. The coolant inlet openings 10 are located at Figure 1 For the sake of clarity, they are only indicated at two locations, but are present at these two end faces 5' of all battery modules 1, 2, 3, 4. A coolant, preferably a dielectric coolant, flows through the coolant inlet openings 10 into the housing 5.1, 5.2 and acts on the battery cell stacks 6, 7, 8, 8', 8", 9, 9', 9". The flow path of the coolant is illustrated here by dashed arrows.

[0064] The coolant flows from the end face 5.1 through the coolant line 14 to the center, where it flows through the coolant outlet opening 11 into the coolant channel 12. The coolant line 14 and the coolant outlet opening 11 are only indicated here for the sake of clarity, but are present in each of the battery modules 1, 2, 3, 4.

[0065] The coolant channel 12 collects the coolant heated by the battery cell stacks 6, 7, 8, 8', 8", 9, 9', 9" and guides the coolant further in the first direction X. A battery module connector (see Figure 2 、 Figure 3 ), the battery module connector is thereby also cooled.

[0066] Figure 2 The battery device 100 according to an exemplary embodiment of the present invention is schematically shown. Here, the battery device 100 is shown from a perspective along a first direction (ie, from the front). Figure 1 Battery device 100. Here, too, the first battery module 1 can be seen, which has a first housing 5.1, side walls 5', a lateral coolant inlet opening 10, a first battery cell stack 6, a further first battery cell stack 7, and a coolant path, again indicated by dashed arrows. For reasons of perspective, the second battery module is not visible.

[0067] Here, it is clearly visible how the coolant enters the first housing 5.1 through the coolant inlet opening 10 at the end side 5' and circulates, thereby cooling the battery cells 6', 7' of the first and second battery cell stacks 6, 7. From the coolant inlet opening 10, the coolant initially flows in a third direction Z (here upward and downward) through the outer sides 6.3, 7.3 of the first and second battery cell stacks 6, 7, facing the end sides 5'. The coolant is then divided into coolant lines 14 along the bottom sides 6.1, 7.1 and top sides 6.2, 7.2 of the first and second battery cell stacks 6, 7, and into further coolant lines 15 in a second direction Y, here horizontally, between the individual battery cells 6', 7' of the first and second battery cell stacks 6, 7 towards the center. The battery cells 6', 7' are stacked one on top of the other in the third direction Z.

[0068] In the center of the first shell 5.1, the coolant now first circulates around a part of the battery module connector 13 in the interior space 5″′ of the first shell 5.1 and is then guided along the inner sides 6.4, 7.5 of the first and second battery cell stacks 6, 7 through the coolant outlet opening 11 into the coolant channel 12 arranged on the top side 5″ of the first shell 5.1.

[0069] Arranged in the coolant channel 12 are busbars 13 . 1 of the battery module connector 13 , which are likewise cooled by the coolant.

[0070] Although the second, third and fourth battery modules 2 , 3 , 4 are not visible here, the coolant flows in these battery modules 2 , 3 , 4 are guided in a manner completely similar to that shown here.

[0071] The coolant channel 12 and the first housing 5.1 are both electrically insulated. It can be seen that the side wall 5' is significantly thicker than the remaining walls of the first housing 5.1. This allows energy to be absorbed and dissipated in the event of an accident.

[0072] Here, it can also be seen that the coolant channel 12 is multi-part. Two bottom parts 12.2 are connected to the first housing 5.1 in a fluid-tight manner on the left and right sides of the coolant outlet opening 11. A top part 12.1 is arranged above these two bottom parts 12.2 and is also connected to the bottom part 12.2 in a fluid-tight manner. The coolant channel 12 is adhesively bonded or welded to the first housing 5.1.

[0073] Figure 3 A battery device 100 according to an exemplary embodiment of the present invention is schematically illustrated. The embodiment of the battery device 100 shown here is similar to Figure 2The embodiment shown differs in that the battery cells 6', 7' of the first battery module 1 are arranged side by side in the second direction Y. The coolant enters the end side 5' of the first housing 5.1 through the coolant inlet opening 10. The coolant (indicated by dashed arrows) first flows in the interior space 5" of the first housing 5.1 to the bottom sides 6.1, 7.1 of the first and second battery cell stacks 6, 7. Here, the coolant is branched off at the coolant line 14 along the bottom sides 6.1, 7.1 and enters a further coolant line 15. It then flows in the third direction Z to the top sides 6.2, 7.2 of the first and second battery cell stacks 6, 7. The coolant is guided along the top sides 6.2, 7.2 via the coolant line 14 to the center and into the cooling channel 12 through the coolant outlet opening 10.

[0074] In order to enable the coolant to flow through further coolant lines 14 rather than only along the outer sides 6 . 3 , 7 . 3 or the inner sides 6 . 4 , 7 . 4 of the battery cell stacks 6 , 7 , the battery arrangement 100 has a fluid-tight closure element 16 .

[0075] As an alternative to the embodiment shown here, by implementing the closing element 16, it is also possible to achieve a coolant flow that first flows upward along the outer sides 6.3, 7.3, then downward again via the further coolant line 14, and finally upward again at the inner sides 6.4, 7.4 to the coolant outlet opening 11. It is also conceivable to arrange the closing element so that the coolant flows in a meandering manner between the battery cells 6', 7', i.e., alternately upward and downward.

[0076] Here, as in Figure 2 As in the embodiment shown in FIG, the multi-part nature of the battery module connector 13 with the busbar 13.1 and the coolant channel 12 with the bottom part 12.2 and the top part 12.1 can also be seen.

[0077] Although the second, third and fourth battery modules 2 , 3 , 4 are not visible here, the coolant flows in these battery modules 2 , 3 , 4 are guided in a manner completely similar to that shown here.

[0078] Figure 4 A motor vehicle 200 according to an exemplary embodiment of the present invention is schematically illustrated. The motor vehicle 200 includes a battery arrangement 100 according to an exemplary embodiment of the present invention. A floor beam 201 of the motor vehicle 200 can be seen. Furthermore, a first direction X, corresponding to the longitudinal axis x of the motor vehicle 200, a second direction Y, corresponding to the transverse axis y of the motor vehicle 200, and a third direction Z, corresponding to the vertical axis z of the motor vehicle 200, are indicated.

[0079] List of Reference Numerals

[0080] 1. First battery module

[0081] 2 Second battery module

[0082] 3. Third battery module

[0083] 4 Fourth battery module

[0084] 5.1 First Shell

[0085] 5.2 Second Shell

[0086] 5' end

[0087] 5” top side

[0088] 5” interior space

[0089] 6. First battery cell stack

[0090] 6.1 Bottom side of the first battery cell stack

[0091] 6.2 Top side of the first battery cell stack

[0092] 6.3 Outside of the First Battery Cell Stack

[0093] 6.4 Inside the First Battery Cell Stack

[0094] 7 Another first battery cell stack

[0095] 7.1 Bottom side of another first battery cell stack

[0096] 7.2 Top side of another first battery cell stack

[0097] 7.3 Outside of Another First Battery Cell Stack

[0098] 7.4 Inside of Another First Battery Cell Stack

[0099] 8 Second battery cell stack

[0100] 8' third battery cell stack

[0101] 8” fourth battery cell stack

[0102] 9 Another second battery cell stack

[0103] 9' Another third battery cell stack

[0104] 9” Another fourth battery cell stack

[0105] 10 Coolant inlet opening

[0106] 11 Coolant outlet opening

[0107] 12 coolant channels

[0108] 12.1 Top part

[0109] 12.2 Bottom part

[0110] 13 Battery module connector

[0111] 13.1 Bus

[0112] 14 Coolant lines

[0113] 15 Additional coolant lines

[0114] 16 Closure element

[0115] 200 motor vehicles

[0116] 201 bottom beam

[0117] x longitudinal axis

[0118] X first direction

[0119] y horizontal axis

[0120] Y second direction

[0121] z vertical axis

[0122] Z third direction

Claims

1. A battery device (100) for a motor vehicle (200), the battery device comprising: A first battery module (1) having a first housing (5.1); a second battery module (2) arranged adjacent to the first battery module (1) in a first direction (X) and having a second housing (5.2); coolant passages (12), and a battery module connector (13) arranged in the coolant channel (12) for electrically contacting the first battery module and the second battery module, It is characterized by: The first housing and the second housing have coolant inlet openings (10) at opposite end sides (5') in a second direction (Y) arranged orthogonally to the first direction (X), and respectively have coolant outlet openings (11) arranged centrally in the first housing or the second housing relative to the second direction (Y) and leading to the coolant channel (12).

2. The battery device (100) according to claim 1, characterized in that The coolant channel (12) has a main extension direction along the first direction (X).

3. The battery device (100) according to claim 1 or 2, characterized in that The end side (5') is mechanically reinforced, wherein the end side (5') is thicker than the wall of the remaining sides of the first and second shells and / or has reinforcing ribs and / or is made of a stronger material than the remaining sides of the first and second shells.

4. The battery device (100) according to claim 1 or 2, characterized in that The battery module connector (13) has a busbar (13.1), wherein the busbar (13.1) is arranged along the first direction (X).

5. The battery device (100) according to claim 1 or 2, characterized in that The first battery module (1) has a first battery cell stack and another first battery cell stack, wherein the first battery cell stack and the another first battery cell stack are arranged side by side in the first housing (5.1) relative to the second direction (Y), The second battery module (2) has a second battery cell stack and another second battery cell stack, wherein the second battery cell stack and the another second battery cell stack are arranged side by side in the second housing (5.2) relative to the second direction (Y).

6. The battery device (100) according to claim 5, characterized in that Coolant lines (14) are arranged on the bottom sides of the first battery cell stack, the other first battery cell stack, the second battery cell stack and the other second battery cell stack and on the top sides of the first battery cell stack, the other first battery cell stack, the second battery cell stack and the other second battery cell stack opposite to the bottom sides, and the coolant lines are used to guide the coolant along the second direction (Y).

7. The battery device (100) according to claim 6, characterized in that Additional coolant lines are arranged between the battery cells of the first battery cell stack, the further first battery cell stack, the second battery cell stack, and the further second battery cell stack, the additional coolant lines being used to guide the coolant in the second direction (Y).

8. The battery device (100) according to claim 6, characterized in that Additional coolant lines are arranged between the battery cells of the first battery cell stack, the another first battery cell stack, the second battery cell stack and the another second battery cell stack, and the additional coolant lines are used to guide the coolant along a third direction (Z) orthogonal to the first direction (X) and the second direction (Y).

9. The battery device (100) according to claim 8, characterized in that In the coolant line (14), a closing element (16) for fluid-tightly closing the coolant line (14) is arranged on the top side at the outer side of the first battery cell stack, the further first battery cell stack, the second battery cell stack and the further second battery cell stack facing the end side (5'), and on the bottom side at the inner side opposite the outer side, or In the coolant line (14), a closing element (16) for closing the coolant line (14) in a fluid-tight manner is arranged on the bottom side at the outside of the first battery cell stack, the further first battery cell stack, the second battery cell stack and the further second battery cell stack, and on the top side of the inside.

10. The battery device (100) according to claim 4, characterized in that The coolant channel (12) is arranged outside the top side (5") and the interior space (5'") of the first shell and the second shell, wherein a portion of the battery module connector (13) is arranged in the interior space (5') and a portion of the battery module connector (13) is arranged in the coolant channel (12), wherein the busbar (13.1) is arranged in the coolant channel (12).

11. The battery device (100) according to claim 10, characterized in that The coolant channel (12) is welded, glued and / or screwed to the top side (5") and the outside of the inner space (5'") of the first shell and the second shell.

12. A motor vehicle (200) having a battery arrangement (100) according to one of claims 1 to 11.

13. The motor vehicle (200) according to claim 12, characterized in that The first direction (X) is arranged along a longitudinal axis (x) of the motor vehicle (200), and the second direction (Y) is arranged along a transverse axis (y) of the motor vehicle (200).

14. The motor vehicle (200) according to claim 13, characterized in that The end side (5') is arranged toward a bottom beam (201) of the motor vehicle (200).

15. A method for operating a battery arrangement (100) of a motor vehicle (200), the battery arrangement comprising: A first battery module (1) having a first housing (5.1); a second battery module (2) arranged adjacent to the first battery module (1) in a first direction (X) and having a second housing (5.2); coolant passages (12), and a battery module connector (13) arranged in the coolant channel (12) for electrically contacting the first battery module and the second battery module, The first shell and the second shell have coolant inlet openings (10) at opposite end sides (5') in a second direction (Y) arranged orthogonal to the first direction (X), and the coolant flows into the corresponding shell through the coolant inlet openings. The first shell and the second shell respectively have a coolant outlet opening (11) arranged in the center of the first shell or the second shell relative to the second direction (Y) and leading to the coolant channel (12), and the coolant flows out from the corresponding shell through the coolant outlet opening.

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