Battery cooling device for an electric battery module of an electric drive

Abstract

1. A battery cooling device for an electric battery module of an electric drive in an electric vehicle, the battery cooling device forming a substantially closed flow chamber for circulating a temperature-controlled fluid, the battery cooling device having a number of flow elements arranged in the flow chamber, the flow elements influencing the flow of the temperature-controlled fluid through the flow chamber.

Description

[Technical Field]

[0001] The present invention relates to a battery cooling device for an electric battery module of an electric drive unit provided in an electric vehicle.

[0002] An electric vehicle includes, among other things, an electric machine as a drive source, electrically connected to an electric battery module as a power storage means. In a drive mode, the electric machine converts electrical energy into mechanical energy for driving the electric vehicle. The electric battery module, also simply called a battery or accumulator, is typically cooled using a battery cooling device.

[0003] From the publication DE 10 2016 120 826 A1, a battery housing for a vehicle driven by an electric motor is known, which comprises a pan part with a bottom and side walls integrally formed on the bottom, and a frame structure surrounding the pan part on the outside, the frame structure forming a hollow space.

[0004] From the publication DE 10 2018 106 399 A1, a housing assembly for accommodating an electrical storage means for an electrically driven motor vehicle is known. The housing assembly includes a pan assembly and a cover assembly. The pan assembly and / or the cover assembly have a first molded part and a second molded part, which are made from a flexible rolled metal material and are joined to each other, so that the first molded part and the second molded part have a variable sheet metal thickness in the longitudinal direction of each molded part.

[0005] German Patent No. 102016108849 discloses a battery holder for a motor vehicle. The battery holder has a bottom sheet metal, a lateral frame extending all around the perimeter, and a cover. The bottom sheet metal and the frame are manufactured as a single, pan-shaped, sheet metal part from a three-layer composite steel. The inner layer is made of an acid-resistant steel alloy, and the outer layer is made of a stainless steel alloy.

[0006] From the publication DE 10 2016 115 037 A1, a battery box with lateral reinforcements is known, which comprises a side wall structure with a connection profile for connecting the battery box to a motor vehicle.

[0007] From the publication DE 10 2014 226 566 A1, a battery box for a traction battery of an electrically operated vehicle is known, which battery box comprises a side wall formed from a stay structure.

[0008] Publication CN109361037 discloses a battery pack for an electric vehicle with expansion-molded liquid-cooled plates.

[0009] EP 3026753 A1 discloses a battery cooling assembly for a motor vehicle. The battery cooling assembly includes a first metal sheet and a second metal sheet joined together by roll bonding. In certain regions, the metal sheets are joined together, and in other regions, the metal sheets are spaced apart to form cavities that define cooling channels.

[0010] German Patent Application No. 102016205237 discloses a temperature control device for a battery module. The temperature control device has a substantially closed flow chamber with a number of spacer elements arranged inside the flow chamber. The spacer elements are arranged inside the flow chamber. The temperature control device also has a flow deflection unit arranged inside the flow chamber. The flow deflection unit has a first end and a second end, and the flow deflection unit has a longitudinal direction extending along the flow deflection unit from the first end to the second end.

[0011] WO 2021 / 009256 discloses a housing assembly including a frame, a bottom, and a cover, which form a storage compartment for an electrical storage means. The frame includes a plurality of frame elements made of a metal material with a variable sheet metal thickness over its length. The bottom is joined to the frame to form a dense pan. The bottom may have an integrated cooling structure through which a coolant can flow. The cooling structure may have a plurality of parallel joint areas with linear channels located between them, or the joint areas may be formed by points, resulting in a grid-like cooling structure.

[0012] The problem is to provide a battery cooling device with improved cooling output.

[0013] This problem is solved by the subject matter of claim 1. Advantageous configurations are set out in the dependent claims.

[0014] The battery cooling device according to the present invention is used for thermostating electric battery modules for electric drives of electric vehicles, wherein the battery cooling device forms a flow chamber closed to the outside for circulating a thermostating fluid, in which a number of flow elements are arranged for influencing the flow of the thermostating fluid through the flow chamber, at least some of the flow elements being formed as elongated webs with at least one head region, swept by the flow on all sides, wherein the length of the web in the longitudinal direction is greater than the width of the web in the direction perpendicular to the longitudinal direction, and wherein the head region has an increased width in the direction perpendicular to the longitudinal direction that is greater than the minimum width of the web.

[0015] An advantage is that the width of the web can be reduced to a minimum in areas with high temperature-control demands in order to increase the surface wetted by the temperature-control fluid in the flow chamber. For example, in the case of aluminum sheet, a minimum web width of 1 mm can be achieved. Due to the increased width of the head region, excessive thinning in this area due to loads imposed over the service life, such as cyclic loads, is avoided. Thus, the required service life can be achieved despite the advantageously minimized web width. In this case, the increased width may be at least 1.05 times greater than the minimum web width. The web may be shaped for both flow guidance and intentional structural and mechanical stiffening, in which case the increased width may be up to 5 times greater than the minimum web width. The web may preferably have one head region at each of its longitudinal ends, and these head regions of a web may differ from each other in terms of shape and dimensions. A "flow chamber closed to the outside" is understood to mean a fluid-tight enclosed chamber which may have one or more connection ports to the outside so that a temperature-regulating fluid can be supplied or drawn off.

[0016] The flow chamber is formed between two plates joined in a predetermined region by roll cladding, where the plates are joined in a material-bonded manner in the joining region and expanded in the unjoined hollow region, forming the flow element. Roll cladding can also be called "roll bonding." Material-bonding is avoided in the hollow region by applying a coating before roll cladding. Due to the increased width of the head region, thinning of the hollow region between the plates is advantageously avoided when expanding this region. The expansion of the hollow region is achieved, for example, by introducing compressed air into the unjoined region between the plates. The hollow region can be expanded on one side in one of the two plates or on both sides in both plates. In both cases, the battery cooling device can have a flat contact surface for the battery cells.

[0017] The head region may have one of the following shapes: T-shaped, Y-shaped, clover-shaped, heart-shaped, or circular, with these designations merely being general descriptions of possible shapes. The head region may, for example, have one or more radii, the smallest radius of which is at least 1.3 times greater than the maximum spacing of the plates in the hollow region surrounding the head region. This spacing is understood to be the spacing of the plates perpendicular to the main extension plane of the plates. The radii of the head region, together with the web, may be considered a kind of bone shape.

[0018] In one embodiment, part of the flow element can be formed as a separating web through which the flow passes on three sides. In this case, the flow chamber has at least two compartments separated from each other by one of the separating webs, which compartments form, for example, a forward section and a return section for the thermoregulating fluid. The flow through the entire flow chamber is ensured by the forward and return sections. The separating web can have through-holes connecting the compartments, in which case the through-holes have a total length along the separating web of less than 5% of the total length of the separating web. These through-holes advantageously allow a certain degree of compensation between the forward and return sections, which allows for a more uniform thermoregulating output.

[0019] In another embodiment, a portion of the flow element can be configured as an attachment area, which is passed by the flow on all sides, for connecting the battery cooling device to the battery housing or the vehicle. The attachment area can be configured additionally to influence the flow, for example, if the attachment area has a greater extension in the rolling direction used in the roll cladding than in the direction perpendicular to this rolling direction. The attachment area has a radius of more than 5 mm.

[0020] In yet another embodiment, the flow chamber may be formed by an extended hollow area only in the first of the two plates, with the second of the two plates having at least one abutment surface for the battery module. The abutment surface may have a flatness of less than 1 mm, in particular, to advantageously promote heat transfer between the battery module and the battery cooling device. The second plate may have an extended hollow area outside the abutment surface, for example, to influence the flow of the thermoregulating fluid.

[0021] In yet another embodiment, the battery cooling device may have a pan shape, in which case the flow chamber extends across a bottom region forming the pan shape and at least one wall region connected to the bottom region. Additionally or alternatively, a passage connected to the flow chamber may extend into the wall region forming the pan shape. In this case, the expansion of the hollow region occurs after transformation into the pan shape. The pan-shaped battery cooling device may be formed as part of a battery housing, for example, as a bottom pan or cover with a storage function.

[0022] The battery cooling device may have at least one indentation, which may be introduced before or after the plate is expanded. The indentation may be used to accommodate a reinforcing element. By accommodating a reinforcing element in the indentation, a flat surface may be advantageously provided, for example as a bearing surface for a battery cell. The indentation in the region of the flow chamber is particularly introduced before the plate is expanded. The indentation may be used to form a sealing embossment outside the flow chamber. The indentation outside the flow chamber may be introduced after expansion.

[0023] The flow chamber may have at least one passage, in which the hollow region extends to the edge of the battery cooling device, so that the flow chamber is open to the outside. A fluid connection oriented in the longitudinal direction of the passage may be connected to the passage for introducing or discharging a cooling fluid. The fluid flow through the longitudinal fluid connection and through the passage itself preferably flows into or out of the flow chamber without deflection, approximately parallel to the plane defined by the main extension direction of the plates. Alternatively or additionally, one of the plates may have at least one opening, through which a vertical fluid connection is connected to the flow chamber. A "vertical fluid connection" is considered to be a connection in which the fluid flow in the connection flows in a direction perpendicular to the plane defined by the main extension direction of the plates, but is not necessarily perpendicular to this plane, for example. The openings are arranged, for example, in the first plate, and in this case the second plate may have a dome-shaped hollow area opposite the openings, which facilitates flow from the vertical fluid connection into the flow chamber.

[0024] Outside the flow chamber, one of the plates may extend beyond the other to save weight. The battery cooling device may be made of corrosion-resistant, high-strength aluminum, which can advantageously take on structural and mechanical functions. The battery cooling device may have a stiffening hollow profile introduced into the roll cladding.

[0025] Another object of the present invention, which achieves the above-mentioned object, is a battery cooling device for an electric battery module of an electric drive unit of an electric vehicle, as set forth in claim 14. The battery cooling device has a fluid passage closed to the outside for circulating a temperature-regulating fluid, wherein the fluid passage is formed between two plates joined in a predetermined region by roll cladding, the plates being joined in a material-bonded manner in the joining region and being expanded in the unjoined hollow region to form the fluid passage. The battery cooling device has a pan shape with a substantially flat bottom region and multiple wall regions, and the cooling passage extends from the bottom region to at least one of the wall regions. The cooling passage may extend from the bottom region through the wall region to the flange region.

[0026] Another object of the present invention is a method for manufacturing a battery cooling device, comprising first joining two plates in a predetermined region by roll cladding in the joining region in a material-connected manner, and then deforming the plates joined in a material-connected manner in a subsequent step so that the battery cooling device has a pan shape with a substantially flat bottom region and multiple wall regions and / or has at least one indentation, and after the deformation, expanding the unjoined hollow region between the plates to form flow chambers and / or fluid channels. In this case, the roll cladding can be performed, for example, before singulating the plates in a strip material. In this case, the deformation and expansion are performed after singulation.

[0027] Roll cladding or roll bonding, a manufacturing method for producing battery cooling devices, offers various advantages. For example, various aluminum alloys, from soft to high-strength, can be used depending on the application. Higher counts offer strength advantages, which favorably affect crush characteristics. Roll cladding allows for extremely high burst pressures of more than 10 bar and / or up to 20 bar, depending on the material, thickness variations, and geometry. Another advantage is that the strength of the battery cooling device is temperature-independent. Furthermore, there is great flexibility in designing the battery cooling device; it can be formed as a single piece using only one plate on each side, or as a multi-piece structure made up of several groups of plates on each side. In this case, flow chambers can be incorporated on one or both sides. In joining techniques, steel-mixed structures are also possible, for example, by using friction welding elements and / or adhesives. The flow chambers formed by the expansion have a clean inner surface, which favors their service life. By incorporating wall areas in pan-shaped battery cooling devices, improved temperature control is achieved.

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a battery cooling device will be described below with reference to the accompanying drawings. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a diagram showing an embodiment of a battery cooling device according to the present invention. [Figure 2] FIG. 2 shows a detail of the embodiment shown in FIG. [Figure 3] FIG. 10 illustrates another embodiment of a battery cooling device according to the present invention. [Figure 4] FIG. 4 shows a detail of the embodiment shown in FIG. 3. [Figure 5] FIG. 4 is a perspective view of the embodiment shown in FIG. 3. [Figure 6] FIG. 6 is a schematic partial cross-sectional view of the embodiment shown in FIG. 5. [Figure 7]10A and 10B show details of yet another embodiment of a battery cooling device according to the present invention. [Figure 8] 8 is a view of the embodiment shown in FIG. 7 from another direction. [Figure 9] FIG. 9 is a cross-sectional view of the embodiment shown in FIG. 8. [Figure 10] 10A and 10B show details of yet another embodiment of a battery cooling device according to the present invention. [Figure 11] FIG. 11 is another view of the embodiment shown in FIG. [Figure 12] FIG. 12 is a cross-sectional view of the embodiment shown in FIG. [Figure 13] 10 is a schematic partial cross-sectional view showing details of yet another embodiment of a battery cooling device according to the present invention. [Figure 14] FIG. 10 is a diagram showing yet another embodiment of a battery cooling device according to the present invention. [Figure 15] 1 illustrates an embodiment of a battery cooling device according to another subject matter of the invention. [Figure 16] FIG. 16 is a partial cross-sectional view of the battery cooling device shown in FIG.

[0030] FIG. 1 shows a plan view of an embodiment of a battery cooling device according to the present invention. FIG. 2 shows an enlarged view of detail A of FIG. 1. In the following, FIGS. 1 and 2 will be described together. A battery cooling device for accommodating electric battery modules (not shown) for an electric drive of an electric vehicle has a substantially closed flow chamber 1 for circulating a temperature-regulating fluid (not shown). "Substantially closed" means that the flow chamber 1 has externally guided connections 2, which serve as both a supply and a return for the temperature-regulating fluid. Apart from this, the flow chamber is gas-tightly closed. The flow chamber 1 is formed between two plates joined in a predetermined area by roll cladding, where the plates are joined together in a material-tight manner in the joining area 3 and are expanded in the unjoined hollow area 4. During roll cladding, also known as roll bonding, the area that will later form the hollow area 4 is coated before rolling the plates, so that only the uncoated area is joined in a material-tight manner by the rolling process to form the joining area. The unjoined hollow area 4 is expanded, for example by introducing compressed air, in which case only one of the plates can be expanded or both plates can be expanded.

[0031] A number of flow elements 5 are arranged in the flow chamber 1. These flow elements 5 influence the flow of the temperature-regulating fluid through the flow chamber 1. In this case, the flow elements 5 are formed by the joining regions 3. At least some of the flow elements 5 are formed as elongated webs 6 with at least one head region 7 and traversed by the flow on all sides. In these elongated webs, the length d in the longitudinal direction L of the web is greater than its width b in a direction perpendicular to the longitudinal direction L. The elongated webs 6 traversed by the flow on all sides are particularly suitable for appropriately or desired guiding or deflecting the flow of the temperature-regulating fluid. Unlike flow channels, which allow substantially only one-dimensional flow, the flow chamber 1 provides a means for mixing the temperature-regulating fluid in a two-dimensional flow field. This results in a more homogeneous temperature distribution within the fluid and increases the temperature-regulating power. Furthermore, the inner surfaces of the flow chamber 1 that are wetted by the temperature-regulating fluid are larger than in the case of, for example, meandering channels.

[0032] The head region 7 of the web 6 is essentially characterized by its increased width B, which is greater than the minimum width b of the web 6 in a direction perpendicular to the longitudinal direction L. In this embodiment, the width b of the web 6 is substantially constant and thus corresponds to the minimum width. The increased width B of the head region 7 prevents excessive thinning of the plate in the transition region between the head region 7 belonging to the joining region 3 and the adjacent hollow region 4 during vehicle operation. Thinning of the plate can occur during its lifetime due to cyclic loads during vehicle operation. Thinning of the plate occurs already in the transition region to the joining region 3 when the hollow region 4 expands. The ratio between the radius R of the head region 7 and the maximum achievable height of the hollow region 4 is at least 1.3. The head region with the increased width B therefore allows the web 6 to be processed and shaped so that the width b of the web 6 can be minimized without reducing the service life of the battery cooling device. By having the webs 6 with a minimized width b, the inner surface of the hollow region 4 that is wetted by the temperature-controlling fluid is increased, thereby improving the temperature-controlling output.

[0033] In the illustrated embodiment, webs 6 of different lengths d and head regions 7 are arranged in three compartments 9 separated from one another by separating webs 8. The thermoregulating fluid flows into each compartment 9 via a passage 10 and returns to the return section. In this case, one passage 10 can supply multiple compartments 9 as a forward or return section. In the illustrated embodiment, each web 6 has two head regions 7. In each compartment 9, the shorter web 6 has a head region 7 with a constant radius R. This head shape can therefore be considered circular. In contrast, the longer web 6 in each compartment 9 has two radii R in each head region 7. These webs 6 can be considered T- or Y-shaped. The webs 6 have a characteristic shape that can also be considered bone-shaped.

[0034] These three compartments 9 can each form a mounting surface for, for example, a battery module, which has a surface that is as flat as possible, for example with a flatness of less than 1 mm, in order to ensure good heat transfer.

[0035] FIG. 3 shows a plan view of another embodiment of the battery cooling device. FIG. 4 shows an enlarged view of detail A shown in FIG. 3. FIG. 5 shows a perspective view of the embodiment shown in FIG. 3. FIG. 6 shows a schematic partial cross-sectional view of a support for accommodating the battery cooling device shown in FIG. 3. FIGS. 3 to 6 will be described together below. As can be seen from the perspective view of FIG. 5, a flat abutment surface 14 is provided that can be used to stand a battery module (not shown). The flat abutment surface 14 forms the inside of the battery accommodating housing or is located in the interior of the battery accommodating housing. It can be seen that the joint region 3 and the hollow region 4 formed by the roll cladding and expansion are provided on the outside of the battery cooling device shown in FIGS. 3 and 4, opposite the abutment surface 14. The illustrated embodiment of the battery cooling device shows two substantially closed flow chambers 1, each with a pair of externally guided connections 2 which are connected to a supply section 11 and a return section 12, respectively, per flow chamber 1. The flow chambers 1 in the illustrated embodiment are identical or mirror-symmetrical relative to a center line. Particularly in the enlarged view, it can be seen that a number of different flow elements 5 are provided. These flow elements 5 are described below.

[0036] In this embodiment, the flow elements 5 are also formed as elongated webs 6 with at least one head region 7, which are passed by the flow on all sides. The enlarged view shows that the head region 7 has an increased width B, perpendicular to the longitudinal direction L, that is greater than the minimum width b of the web 6. The increased width B is, for example, at least 1.05 times greater than the minimum width b of the web 6. In the illustrated embodiment, two head regions 7 are provided per web 6, and these head regions 7 have a circular shape with a radius R. The minimum radius R is at least 1.3 times greater than the maximum spacing between the plates in the hollow region 4. The webs 6 are arranged parallel to one another in groups, and the longitudinal directions L of the webs 6 of different groups may be at various angles to one another. This allows the flow in the flow chamber 1 to be intentionally influenced in order to favorably influence the temperature control output.

[0037] Another part of the flow element 5 is formed as a separating web 8, which is passed by the flow on three sides. In this embodiment, each flow chamber 1 is thus divided into two compartments 9, separated from each other by a separating web 8. The two compartments 9 are each connected to one connection 2 and are connected to each other on the side of the flow chamber 1 opposite the connection 2. A first end 15 of the separating web 8 is joined to the joining area 3 that defines the flow chamber 1, while a second end 16 of the separating web 8 is located within the flow chamber 1 so that it can be passed by the flow. The two compartments 9 thus advantageously form an outward flow path 11 and an inward flow path 12 for the thermoregulating fluid. The separating web 8 may have through-holes 17 connecting the compartments 9. In this case, the through-holes 17 extend along the separating web 8 by a total length of less than 5% of the total length of the separating web 8. The through passages 17 allow locally limited mixing of the thermoregulating fluid from the outgoing section 11 and the returning section 12 in order to intentionally influence the thermoregulating output.

[0038] Further portions of the flow element 5 are formed as mounting areas 18, which are passed by the flow on all sides. The mounting areas 18 are intended to connect the battery cooling device to a support structure, such as a battery housing or a component of a vehicle (not shown). The mounting areas 18 may extend longer in the rolling direction used during roll cladding than in a direction perpendicular to this rolling direction. This allows the mounting areas 18 to influence the flow of the temperature-regulating fluid. The mounting areas 18 may be provided with holes 19 as connecting elements. In the illustrated embodiment, six groups of mounting areas 18 of different sizes are arranged across the entire battery cooling device in parallel stripes perpendicular to the main flow direction of the forward and return sections 11 and 12. The perspective view of the battery module mounting surface 14 shown in FIG. 5 also reveals the striped arrangement of the mounting areas 18. In this case, holes 19 are provided only in some of these stripes and only in some of the mounting regions 18. On the side of the contact surface 14, the battery cooling device has indentations 20 along the stripes with the mounting regions 18 for receiving reinforcing elements 21. The indentations 20 can be introduced into the battery cooling device or into the flow chamber 1 before or after roll cladding and expansion. FIG. 6 shows a schematic half-section of a plate 23 forming the contact surface 14 in the region of the indentations 20 with reinforcing elements 21, which are used, for example, for lateral stiffening of the battery cooling device. The depth of the indentations 20 corresponds to the thickness of the flange sections 22 of the reinforcing elements 21. As a result, the contact surface 14 for the battery module is formed by the flange sections 22 in the region of the indentations 20. This is advantageous because it allows optimal utilization of the available construction space while simultaneously providing good heat transfer.

[0039] In addition to the described flow elements 5, further circular or elongated, fully or partially flow-through junction areas 3 may be provided in the flow chamber 1, which contribute to influencing the flow and / or ensuring the strength of the battery cooling device. The radius of all of the radii of the flow-through flow elements 5 or junction areas 3 adjacent to the hollow area 4 is at least 1.3 times greater than the maximum spacing of the plates in the hollow area 4. For example, these radii may have a radius of at least 5 mm.

[0040] FIG. 7 shows a perspective view of a further embodiment of a battery cooling device according to the present invention, with only a portion of the device visible. The illustrated embodiment can be combined with the previously described embodiments. FIG. 8 shows a plan view of this embodiment. FIG. 9 shows a partial cross-section along line AA in FIG. 8. FIGS. 7-9 will be discussed together below. The flow chamber 1 has a passage 10 that extends to the edge of the battery cooling device, so that the hollow area 4 formed between the plates 23 has an opening to the outside. Gas-tight connections 2 for introducing or withdrawing a temperature-regulating fluid are connected to the passage 10. The fluid connections 2, oriented in the longitudinal direction of the passage 10, preferably introduce or withdraw a fluid flow into or from the flow chamber 1 without deflection, approximately parallel to the plane defined by the main extension direction of the plates 23, 25. As shown in the drawings, the parallel fluid connections 2 may be folded.

[0041] FIG. 10 shows a perspective view of a further embodiment of a battery cooling device according to the present invention, with only a portion of the device visible. The illustrated embodiment can be combined with the previously described embodiment. FIG. 11 shows a plan view of this embodiment. FIG. 12 shows a partial cross-section along line AA in FIG. 11. FIGS. 10-12 will be discussed together below. One of the plates 23 has two openings 24, which open the flow chamber 1 to the outside. In the region of the openings 24, a connection 2 is gas-tightly connected to the surface of each plate 23, allowing the temperature-regulating fluid to be introduced into or removed from the flow chamber 1. The fluid flows perpendicular to the plane defined by the main extension direction of the plates 23 and 25. The openings are located, for example, in the first plate. In this case, the second plate may have a dome-shaped hollow area facing the openings, which facilitates the flow from the vertical fluid connections into the flow chamber.

[0042] FIG. 13 shows a schematic partial cross-sectional view of yet another embodiment of a battery cooling device according to the present invention. This cross-sectional view shows an alternative configuration of the vertical fluid connection 2. In the region of the opening 24, the vertical fluid connection 2 is gas-tightly connected to the surface of the first plate 23, allowing the temperature-regulating fluid to be introduced into or removed from the flow chamber 1. The fluid flows perpendicular to the plane defined by the main extension direction of the plates 23 and 25. Opposite the opening 24, the second plate 25 has a dome-shaped hollow area 4, which facilitates the flow from the vertical fluid connection 2 into the flow chamber 1 (arrow P). The dome-shaped hollow area 4 is produced by a corresponding forming tool during expansion. The flow chamber 1 can be formed by the expanded hollow area 4, which is present only in the first plate 23, allowing the second plate 25 to form the abutment surface 14 for the battery module, thereby advantageously facilitating heat transfer between the battery module and the battery cooling device. Nevertheless, the second plate 25 may have, outside the contact surface, hollow areas 4, e.g. dome-shaped as shown here, which make it possible to locally influence the flow of the temperature control fluid.

[0043] FIG. 14 shows a perspective view of yet another embodiment of a battery cooling device according to the present invention. The battery cooling device is characterized by having a pan shape, in which the flow chamber 1 extends at least over the bottom region 53 forming the pan shape. The flow chamber 1 may extend from the bottom region 53 forming the pan shape to at least one wall region 52 connected to the bottom region 53. Additionally, at least one fluid passage extending through the wall region 52 may be connected to the flow chamber 1. The flow chamber 1 of the pan-shaped battery cooling device may be configured comparable to the embodiment shown in FIG. 3. In this case, the flow chamber 1 has, for example, the following flow elements 5: an elongated web 6 with a head region 7, which is swept by the flow on all sides, separating webs 8, which are swept by the flow on three sides, and an attachment region 18. The passage 10 is connected to the forward section 11 and the return section 12. In the outward section 11, the webs 6 are oriented, as can be seen in the drawing, either from the edge of the battery cooling device toward the separating web 8 or so that the fluid flow is directed from the edge toward the separating web 8, since less cooling power is required in the edge regions than in the central region of the flow chamber 1. At the end of the flow chamber 1 opposite the passage 10, the fluid flow is redirected from the outward section 11 to the return section 12. This redirection is also facilitated by the corresponding orientation of the webs 6. The attachment regions are arranged in stripes in the outward and return sections 11 and 12, perpendicular to the flow direction.

[0044] FIG. 15 shows a perspective view of another subject of the present invention. A battery cooling device for an electric battery module of an electric drive in an electric vehicle has a substantially closed fluid passage 51 for circulating a temperature-regulating fluid. The fluid passage 51 is formed between two plates joined in a predetermined area by roll cladding. The plates are joined in a material-bonded manner in the joining area 3 and expanded in the unjoined hollow area 4 to form the fluid passage 51. The battery cooling device has a pan shape, and the cooling passage 51, deformed after roll cladding, extends from the pan's bottom area 53 to the pan's wall area 52 and back again. The fluid passage 51 can be guided to a flange area 54 of the pan-shaped battery cooling device. In the illustrated embodiment, connectors 2 are connected to the beginning and end of the fluid passage 51 in the flange area 54. FIG. 14 shows a partial cross-section along line AA in FIG. 13. This partial cross-sectional view shows a detail of an embodiment in which both plates 23 are provided with two circumferentially extending sealing embossments 55 by indentation in the flange area 54. The indentation of the sealing embossments 55 can be carried out after the cooling passages 51 have been enlarged. [Explanation of symbols]

[0045] 1 Flow chamber 2 Connection 3 Joint area 4 Hollow area 5 Flow Elements 6 A narrow web swept by currents on all sides 7 Head Area 8 Separation Web 9 compartments 10 aisles 11 Outbound Section 12 Return section 14 Contact surface 15 First end 16 Second end 17 Passage 18 Mounting Area 19 holes 20 Indentation processing section 21 Reinforcing element 22 Flange classification 23 First Plate 24 Aperture 25 Second Plate 51 Fluid passage 52 Wall area 53 Bottom area 54 flange area 55 Seal embossing section L Longitudinal direction d length b Minimum width B Increased width R radius P arrow

Claims

1. 1. A battery cooling device for an electric battery module of an electric drive device provided in an electric vehicle, comprising: The battery cooling device has a flow chamber (1) that is closed to the outside and for circulating a temperature-regulating fluid; The flow chamber (1) is formed between two plates joined together in a predetermined area by roll cladding, the plates (23, 25) being joined in a material-connected manner in the joining area (3) and being expanded in an unjoined hollow area (4) to form the flow chamber (1); The joining area (3) forms a flow element (5), A number of flow elements (5) are arranged in the flow chamber (1) to influence the flow of thermoregulating fluid through the flow chamber (1), At least some of the flow elements (5) are formed as elongated webs (6) with at least one head area (7) and are passed over by the flow on all sides, The length (d) of the web in the longitudinal direction (L) is greater than the width of the web in the direction perpendicular to the longitudinal direction (L), the head region (7) has an increased width (B) in a direction perpendicular to the longitudinal direction (L) that is greater than the minimum width (b) of the web (6); a part of the flow element (5) formed as a separating web (8) which is passed by the flow on three sides, and the flow chamber (1) has at least two compartments (9) separated from each other by one of the separating webs (8); Battery cooling device for an electric battery module of an electric drive.

2. 2. The battery cooling device of claim 1, wherein said increased width (B) is at least 1.05 times greater than said minimum width (b) of said web.

3. 3. The battery cooling device according to claim 1, wherein the head region (7) has one or more radii (R) of radii that are at least 1.3 times greater than the maximum spacing between the plates (23, 25) in the hollow region (4) surrounding the head region (7).

4. 3. A battery cooling device according to claim 1, wherein the two compartments (9) form an outgoing (11) and an incoming (12) path for a thermoregulating fluid.

5. 3. The battery cooling device according to claim 1, wherein the separating web (8) has through passages (17) connecting the compartments (9), the through passages having a total length along the separating web of less than 5% of the total length of the separating web (8).

6. 3. The battery cooling device according to claim 1, wherein a part of the flow element (5) is formed as a mounting hole (18) passing through the plate (23, 25) for connecting the battery cooling device to a battery housing or a vehicle.

7. 3. The battery cooling device according to claim 1, wherein the battery cooling device has a pan shape, and the flow chamber (1) extends across a bottom region (53) forming the pan shape and at least one wall region (52) connected to the bottom region.

8. 3. The battery cooling device according to claim 1, wherein the flow chamber (1) is formed by an enlarged hollow area (4) provided in a first plate (23) of the two plates, and a second plate (25) of the two plates has at least one bearing surface (14) for a battery module, the bearing surface (14) having a flatness of less than 1 mm.

9. 9. The battery cooling device according to claim 8, wherein the second plate (25) has an expanded hollow area (4) outside the contact surface (14).

10. 2. The battery cooling device according to claim 1, characterized in that the battery cooling device has at least one indentation (20), which is introduced before or after expanding the flow chamber (1).

11. 3. The battery cooling device according to claim 1, wherein the flow chamber (1) has at least one passage (10) in which the hollow area (4) reaches the edge of the battery cooling device, and a parallel fluid connection (2) is connected to the passage (10).

12. 3. A battery cooling device according to claim 1 or 2, characterized in that one of the plates (23) has at least one opening (24) through which a folded fluid connection (2) is connected to the flow chamber (1).

13. 1. A battery cooling device for an electric battery module of an electric drive device provided in an electric vehicle, comprising: The battery cooling device has a fluid passage (51) that is closed to the outside and that circulates a temperature-regulating fluid; The fluid passage is formed between two plates joined in a predetermined area by roll cladding, the plates being joined in a material-connecting manner in the joining area (3) and being expanded in an unjoined hollow area (4) to form the fluid passage; The battery cooling device is formed in a pan shape with a substantially flat bottom region (53) and a plurality of wall regions (52); the fluid passage (51) extends from the bottom region (53) to at least one of the wall regions (52); Battery cooling device for an electric battery module of an electric drive.

14. 14. The method for manufacturing the battery cooling device according to claim 10 or 13, First, the two plates are joined in a material-connected manner in a predetermined area by roll cladding in the joining area (3), the plates joined in a material-connected manner in a predetermined region are deformed in a subsequent step, and the battery cooling device is deformed so that the battery cooling device is formed in a pan shape with a substantially flat bottom region (53) and a plurality of wall regions (52) and / or the battery cooling device has at least one indentation (20); After deformation, the unbonded hollow areas (4) between the plates are expanded to form flow chambers (1) and / or fluid passages (51). A method for manufacturing a battery cooling device.

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