Cooling tube, battery assembly, and electrical apparatus

Abstract

The present application discloses a cooling tube, a battery assembly, and an electrical apparatus, and relates to the technical field of battery cooling. The cooling tube is used to cool the battery assembly. The cooling tube comprises multiple first tubes arranged along a first direction and extending along a second direction, the first direction intersecting with the second direction, a first width of a first tube in the first direction being W1, a second width between every two adjacent first tubes being W2, and the first width W1 and the second width W2 satisfying the expression: W1≥(1 / 3)*W2. By means of defining the first width W1 of the first tube to be greater than or equal to one third of the second width W2 between adjacent first tubes, it is ensured that a contact area between the first tubes and the battery assembly is sufficiently large, and that the second width W2 between every two adjacent first tubes is identical, so that the cooling tube and the battery assembly are uniformly heated, thereby improving heat dissipation uniformity of the cooling tube and the battery assembly.

Description

Cooling pipes, battery components and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 29, 2023, with application number 202323238066.8 and application name “Cooling Pipes, Battery Assemblies and Electrical Devices”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery cooling technology, and in particular to a cooling pipe, a battery assembly, and an electrical device. Background Art

[0003] As energy density requirements for battery packs continue to increase, they often contain multiple battery modules, each containing multiple cells. During battery pack operation, these cells generate heat over time. This prolonged high-temperature operation negatively impacts the performance and lifespan of the battery pack, posing a safety hazard. Therefore, heat dissipation is essential. A common heat dissipation method is cold plate cooling, where coolant is introduced into the cold plate to dissipate heat from the battery modules. However, this can lead to uneven heating between the cold plate and the battery modules.

[0004] Summary of the Invention

[0005] The purpose of this application is to provide a cooling pipe, a battery assembly and an electrical device to solve the problem of uneven heating of the cooling pipe and the battery module.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] In a first aspect, a cooling pipe is provided for cooling a battery assembly. The cooling pipe includes a plurality of first pipes arranged along a first direction and extending along a second direction. The first direction and the second direction intersect. Along the first direction, a first width of the first pipe is W1, and a second width between two adjacent first pipes is W2. The first width W1 and the second width W2 satisfy: W1 ≥ 1 / 3 * W2.

[0008] In one embodiment, the cooling pipe also includes a second pipe, at least two adjacent first pipes are connected by the second pipe, and the orthographic projection of the second pipe on a plane perpendicular to the first direction and the orthographic projection of the first pipe on a plane perpendicular to the first direction are a bent structure with an angle.

[0009] In one embodiment, the cooling pipe further includes a second pipe, at least two adjacent first pipes are connected by the second pipe, and the orthographic projection of the second pipe on a plane perpendicular to the second direction is a bent structure.

[0010] In one embodiment, the second pipe is bent along a third direction relative to the first pipe to enclose a accommodating space, the third direction, the first direction and the second direction intersect each other, and the accommodating space is formed with an opening on a side of the third direction facing the first pipe, and the accommodating space is used to accommodate at least a portion of the support beam of the battery assembly.

[0011] In one embodiment, the second pipes include a plurality of second pipes, which are arranged at intervals, at least one second pipe is arranged on the first side of the cooling pipe, and at least one second pipe is arranged on the second side of the cooling pipe, and the first side and the second side are opposite in the second direction.

[0012] In one embodiment, the cooling pipe further includes a third pipe, the third pipe extending along the first direction, and two adjacent first pipes are connected by the third pipe. The orthographic projection of the cooling pipe on a plane perpendicular to the third direction is symmetrical about the central axis of the cooling pipe in the first direction, and the third direction is perpendicular to the first direction and the second direction.

[0013] In a second aspect, a battery assembly includes: a first battery module, a second battery module, and a cooling pipe as described in any embodiment of the first aspect; the first battery module, the cooling pipe, and the second battery module are arranged in sequence.

[0014] In one embodiment, a support beam extending along the second direction is provided at the bottom of the second battery module, the support beam is located between two adjacent first pipes, and the support beam is at least partially accommodated in the accommodating space of the cooling pipe.

[0015] In one embodiment, a pull plate is further provided at the end of the first battery module facing the cooling pipe, and the pull plate extends along the second direction. The pull plate is opposite to the third pipe of the cooling pipe in the second direction, and the pull plate is accommodated between the two first pipes connected to the third pipe.

[0016] In one embodiment, the first battery module further includes end plates provided at both ends of the first battery module in the second direction, the ends of the pull plate are connected to the end plates, the orthographic projection of the third pipe opposite to the pull plate on a plane perpendicular to the third direction is located outside the orthographic projection of the first battery module on a plane perpendicular to the third direction, and the third direction intersects with the second direction.

[0017] In one embodiment, at least a portion of the second pipe of the cooling pipe abuts against the outer surface of the end plate, the support beams include a plurality, and the accommodating space of each second pipe accommodates at least a portion of the support beam.

[0018] In one embodiment, the battery assembly further includes a first fixing member, at least a portion of which is located between two adjacent first pipes, the first fixing member is formed with a first fixing hole, the end plate is formed with a first matching member, and the first fixing hole is matched and connected with the first matching member.

[0019] In one embodiment, the battery assembly further includes a thermally conductive adhesive pad, the first pipe of the cooling pipe includes a first surface and a second surface, the first surface and the second surface are arranged relative to each other in a third direction, and the first surface and the second surface are both provided with the thermally conductive adhesive pad.

[0020] In one embodiment, the first pipe includes a first end and a second end, the first end and the second end are arranged relative to each other in a second direction, the third direction is perpendicular to the second direction, and the first end and / or the second end are provided with a limiting portion, and the thermal conductive pad abuts against the limiting portion.

[0021] In one embodiment, along the first direction, the third width of the thermally conductive pad is W3, the third width W3 is greater than or equal to the first width W1 of the first pipe, and the first direction, the third direction and the second direction are perpendicular to each other.

[0022] In one embodiment, the first battery module further includes a confluence section, which is located at two opposite ends of the first battery module in the first direction, and the cooling pipe includes a third end and a fourth end opposite to each other along the first direction, and there is a gap between the third end and the confluence section near the third end, and between the fourth end and the confluence section near the fourth end.

[0023] In one embodiment, along the first direction, a fourth width of the gap is W4, and the fourth width W4 and the first width W1 satisfy: W1≤W4≤3*W1.

[0024] In one embodiment, along the third direction, the first thickness of the cooling pipe is H1, the second thickness of the thermal conductive pad is H2, the third thickness of the distance between the first battery module and the second battery module is H3, and the first thickness H1, the second thickness H2 and the third thickness H3 satisfy: H1+2*H2≥H3.

[0025] In a third aspect, an electrical device includes a battery assembly as described in any embodiment of the second aspect, wherein the battery assembly is used to supply power to the electrical device.

[0026] By limiting the first width W1 of the first pipe to be greater than or equal to one-third of the second width W2 between two adjacent first pipes, it is ensured that the contact area between the first pipe and the battery assembly is large enough, and the second width W2 between two adjacent first pipes is the same, so that the cooling pipe and the battery assembly are heated evenly, thereby improving the heat dissipation uniformity of the cooling pipe and the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments.

[0028] FIG1 is a schematic diagram of the three-dimensional structure of a battery assembly provided in an embodiment of the present application;

[0029] FIG2 is a schematic diagram of the three-dimensional structure of a cooling pipe provided in an embodiment of the present application;

[0030] FIG3 is another schematic diagram of the three-dimensional structure of a cooling pipe provided in an embodiment of the present application;

[0031] FIG4 is a schematic diagram of the three-dimensional structure of a first battery module in a battery assembly provided in an embodiment of the present application;

[0032] FIG5 is a schematic diagram of the three-dimensional structure of the second battery module in the battery assembly provided in an embodiment of the present application;

[0033] FIG6 is another schematic diagram of the three-dimensional structure of a battery assembly provided in an embodiment of the present application;

[0034] FIG7 is a schematic diagram of the three-dimensional structure of a battery assembly provided in an embodiment of the present application;

[0035] FIG8 is a schematic diagram of a three-dimensional structure of a cooling pipe and a thermally conductive pad provided in an embodiment of the present application;

[0036] FIG9 is an enlarged schematic diagram of a point IX in the cooling pipe shown in FIG3 ;

[0037] FIG10 is an enlarged schematic diagram of a point X in the cooling pipe shown in FIG3 ;

[0038] FIG11 is a schematic diagram of the three-dimensional structure of a thermally conductive pad in a battery assembly provided in an embodiment of the present application;

[0039] FIG12 is another schematic perspective view of the cooling pipe in the battery assembly according to an embodiment of the present application;

[0040] FIG13 is another schematic perspective view of the structure of the first battery module in the battery assembly according to the embodiment of the present application;

[0041] FIG14 is another schematic perspective view of the battery assembly according to an embodiment of the present application;

[0042] FIG15 is a schematic diagram of an electrical device provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] A-first direction, B-second direction, C-third direction, W1-first width, W2-second width, W3-third width, W4-fourth width, L1-first length, L2-second length, L3-third length, H1-first thickness, H2-second thickness, H3-third thickness;

[0045] 10a - first battery module, 10b - second battery module, 11 - support beam, 12 - battery cell group, 13 - pull plate, 15 - end plate, 151 - first mating component, 17 - busbar section;

[0046] 30 - cooling pipe, 31 - first pipe, 311 - first surface, 313 - second surface, 315 - first end, 317 - second end, 32 - first side, 33 - second pipe, 331 - accommodating space, 332 - opening, 34 - second side, 35 - third pipe, 36 - third end, 37 - liquid inlet pipe, 38 - fourth end, 39 - liquid outlet pipe;

[0047] 40-thermal insulation cotton;

[0048] 50-first fixing member, 51-first fixing hole;

[0049] 60 - second fixing member, 61 - second fixing hole;

[0050] 70-thermal conductive pad;

[0051] 80-limiting part;

[0052] 100-battery assembly. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] The following descriptions of the various embodiments are provided with reference to the accompanying drawings to illustrate specific embodiments in which the present application may be implemented. Directional terms herein, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," and "side," are used solely with reference to the directions in the accompanying drawings. Therefore, the use of directional terms is intended to better and more clearly illustrate and understand the present application, and is not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present application.

[0055] Furthermore, the serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0056] Please refer to Figures 1 and 15. An embodiment of the present application provides an electrical device, which includes a battery assembly 100 provided in any embodiment of the present application. The battery assembly 100 is used to supply power to the electrical device.

[0057] The power-consuming device may be a vehicle or an energy storage device. The power-consuming device may be a vehicle or an energy storage device. The vehicle may be a new energy vehicle (NEV), such as a pure electric vehicle (PEV / BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. The vehicle may also be any vehicle having a battery assembly 100. The battery assembly 100 may be a battery pack or an energy storage cabinet.

[0058] The battery assembly 100 provided in an embodiment of the present application includes a battery assembly 100 and a cooling pipe 30, and the cooling pipe 30 is used to cool the battery assembly 100, wherein the battery assembly 100 includes a first battery module 10a and a second battery module 10b, and the first battery module 10a, the cooling pipe 30 and the second battery module 10b are arranged in sequence.

[0059] Please refer to Figure 2, the cooling pipe 30 includes a plurality of first pipes 31 arranged along a first direction A and extending along a second direction B. The first direction A and the second direction B intersect. Along the first direction A, the first width of the first pipe 31 is W1, and the third width between two adjacent first pipes 31 is W3. The first width W1 and the third width W3 satisfy: W1≥1 / 3*W3.

[0060] If the first width W1 of the first pipe 31 is less than 1 / 3*W3, the first pipe 31 and the first battery module 10a and the second battery module 10b will not be heated sufficiently. By limiting the first width W1 of the first pipe 31 to be greater than or equal to one-third of the second width W2 between two adjacent first pipes 31, it is ensured that the contact area between the first pipe 31 and the battery assembly 100 is sufficiently large, and the second width W2 between two adjacent first pipes 31 is the same, so that the cooling pipe 30 and the battery assembly 100 are heated evenly, thereby improving the heat dissipation uniformity of the cooling pipe 30 and the battery assembly 100.

[0061] The cooling duct 30 is disposed at the top of the first battery module 10a. In the arrangement of the first and second battery modules 10a, the end of the first battery module 10a facing the second battery module 10b is the top of the first battery module 10a, while the end of the second battery module 10b facing away from the first battery module 10a is the top of the second battery module 10b. The cooling duct 30 has a serpentine structure, with the first direction A and the second direction B being perpendicular.

[0062] The second width W2 between two adjacent first conduits 31 is the width of the spacing between the two adjacent first conduits 31 in the first direction A. The second width W2 between two adjacent first conduits 31 can be the same as or different from the second widths W2 between two other adjacent first conduits 31. If different, the difference between the spacings is small to ensure uniform heat exchange with the first battery module 10a or the second battery module 10b. Preferably, the second width W2 between two adjacent first conduits 31 is the same.

[0063] It should be noted that the structures of the first battery module 10a and the second battery module 10b can be identical. Both the first battery module 10a and the second battery module 10b are provided with a cell group 12 and support beams 11 for securing the cell group 12. The difference between the first battery module 10a and the second battery module 10b is that the positive and negative poles of the cell units in the cell group 12 are arranged in opposite directions, as shown in Figures 4 and 5.

[0064] Please refer to Figure 3. For example, the cooling pipe 30 also includes a second pipe 33. At least two adjacent first pipes 31 are connected by the second pipe 33. The orthographic projection of the second pipe 33 on the plane perpendicular to the first direction A and the orthographic projection of the first pipe 31 on the plane perpendicular to the first direction A have an angle. The angle is: the angle between the connection point of the orthographic projection of the second pipe 33 and the orthographic projection of the first pipe 31 on the plane perpendicular to the first direction A.

[0065] The angle between the orthographic projection of the second pipe 33 on the plane perpendicular to the first direction A and the orthographic projection of the first pipe 31 on the plane perpendicular to the first direction A is greater than or equal to 90° and less than 180°. For example, the value of the angle can be 90°, 100°, 130°, 150° or 160°, etc., which are not listed here one by one.

[0066] Specifically, the connection between the second pipe 33 and the first pipe 31 is an arc transition, and the orthographic projection of the second pipe 33 on a plane perpendicular to the first direction A is an L-shaped structure with an arc transition, so that the second pipe 33 can avoid the end face of the first battery module 10a, and at the same time can also limit the cooling pipe 30 as a whole in the second direction B to prevent the cooling pipe 30 from offsetting in the second direction B.

[0067] Optionally, the orthographic projection of the second pipe 33 on a plane perpendicular to the first direction A may be a C-shaped structure, a Z-shaped structure or other structures, which are not specifically limited.

[0068] For example, the orthographic projection of the second pipe 33 on a plane perpendicular to the second direction B is a bent structure.

[0069] For example, the orthographic projection of the second pipe 33 on a plane perpendicular to the second direction B may be a U-shaped structure. The setting of the U-shaped second pipe 33 enables the cooling pipe 30 as a whole to be stuck on the side wall of the first battery module 10a in the second direction B, preventing the cooling pipe 30 from deviating in the second direction B and affecting the heat dissipation effect of the cooling pipe 30 on the battery assembly 100.

[0070] Optionally, the orthographic projection of the second pipe 33 on the plane perpendicular to the second direction B may also be a W-shaped structure, a C-shaped structure or other bent structures, which are not specifically limited.

[0071] For example, the second pipe 33 is bent along the third direction C relative to the first pipe 31 to enclose a accommodating space 331. The third direction C, the first direction A and the second direction B intersect with each other. The accommodating space 331 has an opening 332 formed on one side of the third direction C facing the first pipe 31. The accommodating space 331 is used to accommodate at least a portion of the support beam 11 of the battery assembly 100.

[0072] The first direction A, the second direction B, and the third direction C may be perpendicular to each other. The opening 332 is in communication with the accommodating space 331 .

[0073] Referring to Figure 6 , the second battery module 10b is stacked on the cooling duct 30. A support beam 11 extending along the second direction B is provided at the bottom of the second battery module 10b. The support beam 11 is located between two adjacent first ducts 31 and is at least partially accommodated in the accommodating space 331. The opening 332 of the accommodating space 331 faces the second battery module 10b in the third direction C.

[0074] The support beam 11 of the second battery module 10b is located between the two first pipes 31 connected to the second pipe 33. The part of the support beam 11 that exceeds the battery cell group 12 in the second battery module 10b extends from the opening 332 into the accommodating space 331. The setting of the second pipe 33 can avoid the support beam 11. On the premise of ensuring that the support beam 11 can fix the battery cell group 12 in the second battery module 10b, the space occupied by the cooling pipe 30 in the battery assembly 100 is reduced, making the internal structure of the battery assembly 100 compact.

[0075] For example, under the premise that the first battery module 10a, the cooling pipe 30 and the second battery module 10b are assembled, the second pipe 33 of the U-shaped structure can be located on a side of the first battery module 10a along the second direction B, or the second pipe 33 of the U-shaped structure can also be located on a side of the second battery module 10b along the second direction B.

[0076] Referring to Figure 7 , the battery assembly 100 may include multiple first battery modules 10a and multiple second battery modules 10b, with the number of first battery modules 10a being equal to the number of second battery modules 10b. When stacking the battery assemblies 100, the cooling ducts 30 can be first installed on the first battery modules 10a, and then the second battery modules 10b can be stacked on the first battery modules 10a with the cooling ducts 30 installed. The cooling ducts 30 are aligned with the top of the first battery modules 10a and the bottom of the second battery modules 10b. Next, the first battery modules 10a with the cooling ducts 30 installed are stacked, followed by the second battery modules 10b. Multiple layers of battery modules can be stacked in this order, for example, 16 layers of battery modules, with 8 layers each of the first battery modules 10a and the second battery modules 10b. The cooling ducts 30 are then provided to dissipate heat from the 16 layers of battery modules. After the battery modules are stacked, the columns of the battery assembly 100 and related electrical structural components are connected, and finally the liquid cooling device of the battery assembly 100 is connected to the liquid inlet pipe 37 and the liquid outlet pipe 39 of the cooling pipe 30.

[0077] Please refer to Figure 3. The second pipes 33 include multiple, and the support beams 11 include multiple. The accommodating space 331 of each second pipe 33 accommodates at least a portion of a support beam 11. The multiple second pipes 33 are arranged at intervals. At least one second pipe 33 is arranged on the first side 32 of the cooling pipe 30, and at least one second pipe 33 is arranged on the second side 34 of the cooling pipe 30. The first side 32 and the second side 34 are opposite to each other in the second direction B.

[0078] In conjunction with Figure 7 , the number of second pipes 33 can be equal to the number of support beams 11. Multiple support beams 11 are spaced apart at the bottom of the second battery module 10b (or the first battery module 10a) in the first direction A, wherein the end of the first battery module 10a facing away from the second battery module 10b is the bottom. Thus, when the cooling pipe 30 is placed between two stacked battery modules, the multiple spaced support beams 11 can be located between two adjacent first pipes 31. The spaced arrangement of the multiple support beams 11 can also enhance the fixation of the battery cell group 12. Furthermore, the multiple second pipes 33 are simultaneously clamped at opposite ends of the first battery module 10a in the second direction B, ensuring that the cooling pipe 30 can be securely mounted on the first battery module 10a and preventing the cooling pipe 30 from deviating in the second direction B and reducing the heat exchange area between the cooling pipe 30 and the battery assembly.

[0079] Please continue to refer to Figure 3. For example, the cooling pipe 30 also includes a third pipe 35. The third pipe 35 extends along the first direction A. Some adjacent first pipes 31 are connected by the third pipe 35. The orthographic projection of the cooling pipe 30 on a plane perpendicular to the third direction C is symmetrical about the central axis of the cooling pipe 30 in the first direction A. The third direction C is perpendicular to the first direction A and the second direction B.

[0080] The cooling pipe 30 includes a first pipe 31, a second pipe 33 and a third pipe 35, wherein two adjacent first pipes 31 are connected by the second pipe 33, and another two adjacent first pipes 31 are connected by the third pipe 35 to form a serpentine cooling pipe 30.

[0081] The cooling pipe 30 also includes a liquid inlet pipe 37 and a liquid outlet pipe 39, which are located on the first pipe 31 on opposite sides of the cooling pipe 30 in the first direction A. In the second direction B, the liquid inlet pipe 37 and the liquid outlet pipe 39 are located on the same side of the cooling pipe 30, wherein the orthographic projection of the cooling pipe 30 on the plane perpendicular to the third direction C on which the liquid inlet pipe 37 and the liquid outlet pipe 39 are installed is still symmetrical about the central axis of the cooling pipe 30 in the first direction A.

[0082] It can be understood that the first pipe 31, the second pipe 33, the third pipe 35, the liquid inlet pipe 37 and the liquid outlet pipe 39 are all formed with flow channels to input coolant into the cooling pipe 30 and dissipate heat from the first battery module 10a and the second battery module 10b through the coolant.

[0083] 3 and 4 , a pull plate 13 is further provided on the top of the first battery module 10 a . The pull plate 13 extends along the second direction B. The pull plate 13 is opposite to the third pipe 35 in the second direction B. The pull plate 13 is accommodated between the two first pipes 31 connected to the third pipe 35 .

[0084] The pull plate 13 fixes the battery cell group 12 in the first battery module 10a. The pull plate 13 and the support beam 11 in the first battery module 10a can limit the battery cell group 12 in the third direction C, ensuring that the top of the battery cell group 12 is a flat surface, thereby making the battery cell group 12 fit more fully with the cooling pipe 30, thereby ensuring the heat dissipation efficiency of the battery assembly 100.

[0085] There can be multiple third pipes 35 and multiple pull plates 13, and the number of pull plates 13 can be equal to or less than the number of third pipes 35. For example, there are four third pipes 35 and four pull plates 13, with each third pipe 35 corresponding to a pull plate 13 in the second direction B. For another example, there can be four third pipes 35 and two pull plates 13, with two third pipes 35 facing the pull plates 13 in the second direction B.

[0086] The first battery module 10a further includes end plates 15 provided at both ends of the first battery module 10a in the second direction B. The ends of the pull plate 13 are connected to the end plates 15. The orthographic projection of the third pipe 35 opposite to the pull plate 13 on a plane perpendicular to the third direction C is located outside the orthographic projection of the first battery module 10a on the plane perpendicular to the third direction C.

[0087] The multiple battery cells in the first battery module 10a are arranged to form a cell group 12. End plates 15 are provided at opposite ends of the cell group 12 in the second direction B. The end plates 15 are used to secure the cell group 12. The orthographic projection of the third pipe 35, which is opposite the pull plate 13, on a plane perpendicular to the third direction C, lies outside the orthographic projection of the cell group 12 on a plane perpendicular to the third direction C. This allows the third pipe 35, located at the edge of the cell group 12, to avoid the pull plate 13 when the cooling pipe 30 is installed on top of the first battery module 10a. This ensures sufficient heat exchange area between the cooling pipe 35 and the cell group 12 while securing the cell group 12.

[0088] 6 , for example, at least a portion of the second pipe 33 abuts against the outer surface of the end plate 15 , the portion where the support beam 11 is connected to the end plate 15 can be accommodated in the accommodating space 331 of the second pipe 33 , and the cooling pipe 30 can be directly attached to the battery cell group 12 to improve heat exchange efficiency.

[0089] For example, the battery assembly 100 may further include thermal insulation cotton 40, which is arranged at the third pipe 35 of the avoidance pull plate 13, that is, the thermal insulation cotton 40 is arranged at the part where the third pipe 35 exceeds the first battery module 10a. In this way, the third pipe 35 located outside the first battery module 10a is prevented from generating condensation and contacting other electrical components in the battery assembly 100 to cause a short circuit, thereby playing a role in protecting the battery assembly 100 from electricity.

[0090] In the present application, at least one second pipe 33 is provided on the first side 32 and the second side 34 of the cooling pipe 30, and the second pipe 33 abuts the outer surface of the end plate 15. The second pipe 33 on the first side 32 and the second pipe 33 on the second side 34 can fix the cooling pipe 30 to prevent the cooling pipe 30 from deviating in the second direction B and affecting the heat dissipation effect of the cooling pipe 30 on the first battery module 10a and the second battery module 10b.

[0091] 3 and 4 , the battery assembly 100 may further include a first fixing member 50 , at least a portion of which is located between two adjacent first pipes 31 , the first fixing member 50 is formed with a first fixing hole 51 , the end plate 15 is formed with a first fitting member 151 , and the first fixing hole 51 is matingly connected to the first fitting member 151 .

[0092] For example, the first fixing member 50 may include multiple members, and at least a portion of a first fixing member 50 is provided between each two adjacent first pipes 31, or at least a portion of a first fixing member 50 is provided between two partially adjacent first pipes 31. The connection between the first fixing member 50 and the first pipe 31 can be connected by welding.

[0093] The serpentine cooling duct 30 can be formed by bending and stamping an aluminum alloy. By placing the first fixing member 50 between two adjacent first ducts 31, the spacing between adjacent first ducts 31 in the first direction A is kept as consistent as possible. This reduces or prevents the possibility that some first ducts 31 may deviate from the second direction B due to displacement of the second battery module 10b during stacking.

[0094] For example, the entire first fixing member 50 is located between two adjacent first pipes 31, and both ends of the first fixing member 50 in the first direction A respectively abut against the two adjacent first pipes 31, such as the first fixing member 50 located on the first side 32 of the cooling pipe 30 shown in FIG2 . For another example, a portion of the first fixing member 50 is located between two adjacent first pipes 31, with one end of the first fixing member 50 in this portion abutting against one of the first pipes 31, and the other portion of the first fixing member 50 abutting against a side surface of the third pipe 35 in the second direction B, such as the first fixing member 50 located on the second side 34 of the cooling pipe 30 shown in FIG2 .

[0095] The first mating member 151 on the end plate 15 can be a positioning post, which is inserted into the first fixing hole 51 to fix the first fixing member 50 to the end plate 15. Alternatively, the first mating member 151 on the end plate 15 can be a positioning hole, which is coaxial with the first fixing hole 51 in the third direction C. The first fixing member 50 and the end plate 15 can be fixedly connected by bolts that are sequentially inserted into the first fixing hole 51 and the positioning hole. Alternatively, two first fixing holes 51 are provided on the first fixing member 50, and a positioning column and a positioning hole (or two positioning holes, or two positioning columns) are provided on the end plate 15. The first fixing member 50 and the end plate 15 are fixedly connected by the positioning columns cooperating with the first fixing holes 51, and the positioning holes and the first fixing holes 51 are fixed by bolts. When assembling the battery assembly 100, the cooling pipe 30 can be accurately installed at the designated position on the top of the first battery module 10a, effectively improving the assembly efficiency, and the cooling pipe 30 is fixed to the end plate 15 by the first fixing member 50 to prevent the cooling pipe 30 from moving when the second battery module 10b is stacked on the cooling pipe 30, thereby preventing problems in the assembly of the battery assembly 100.

[0096] When the first side 32 and the second side 34 of the cooling pipe 30 are both installed with the first fixing parts 50, the first fixing holes 51 on the first fixing parts 50 on both sides are parallel to the symmetry axis of the second direction B and collinear. When the first fixing parts 50 are fixedly connected to the end plate 15, the deviation between the spacing between the two first pipes 31 at the first side 32 and the spacing at the second side 34 is avoided, ensuring that the spacing between the two first pipes 31 connected to the first fixing parts 50 is uniform.

[0097] Referring to Figure 9, for example, the battery assembly 100 may further include a second fixing member 60, which is disposed at the liquid inlet pipe 37 and the liquid outlet pipe 39. The second fixing member 60 and the liquid inlet pipe 37, as well as the second fixing member 60 and the liquid outlet pipe 39, may be fixedly connected by welding. The second fixing member 60 may be provided with a second fixing hole 61, and the end plate 15 may be provided with a second mating member, which may be a through hole. The second fixing member 60 and the end plate 15 may be fixedly connected by bolts passing through the second fixing hole 61 and the through hole. When installing the cooling pipe 30, the second fixing member 60 can be used to position the cooling pipe 30 on the end plate 15 to prevent the cooling pipe 30 from moving and affecting the stacking of the second battery module 10b. In addition, the second fixing member 60 can support the liquid inlet pipe 37 and the liquid outlet pipe 39, which may cause deformation when the liquid cooling device is plugged in and out of the liquid inlet pipe 37 and the liquid outlet pipe 39.

[0098] Referring to Figures 3 and 8 , for example, the battery assembly 100 may further include a thermally conductive adhesive pad 70. The first pipe 31 includes a first surface 311 and a second surface 313. The first surface 311 and the second surface 313 are arranged opposite each other in a third direction C. The thermally conductive adhesive pad 70 is provided on each of the first surface 311 and the second surface 313. The first battery module 10a, the cooling pipe 30, and the second battery module 10b are stacked in the third direction C. The thermally conductive adhesive pad 70 is provided on each of the first surface 311 and the second surface 313. The cooling pipe 30 exchanges heat with the first battery module 10a and the second battery module 10b via the thermally conductive adhesive pad 70 to ensure adequate heat dissipation of the batteries.

[0099] The thermally conductive adhesive pad 70 itself has a certain degree of viscosity and can be directly attached to the cooling pipe 30. The thermal conductivity coefficient of the thermally conductive adhesive pad 70 is greater than or equal to 2W / m·K. At the same time, the thermal dissipation efficiency of the first battery module 10a and the second battery module 10b is higher. The thermally conductive adhesive pad 70 has the advantages of easy installation, high thermal conductivity and low cost.

[0100] Please refer to Figure 10. For example, the first pipe 31 includes a first end 315 and a second end 317. The first end 315 and the second end 317 are arranged opposite to each other in the second direction B. A limiting portion 80 is provided on the first end 315 and / or the second end 317, and the thermal conductive pad 70 abuts against the limiting portion 80.

[0101] For example, a limiting portion 80 is provided on the first end 315; or a limiting portion 80 is provided on the second end 317; or a limiting portion 80 is provided on the first end 315 and the second end 317 of each first pipe 31; or a limiting portion 80 is provided on the first end 315 of each first pipe 31, and a limiting portion 80 is provided on the second end 317 of some first pipes 31, which are not listed one by one here.

[0102] In the present application, the third pipe 35 is connected to the second end 317, and the orthographic projection of the third pipe 35 connected to the second end 317 on a plane perpendicular to the third direction C is located within the orthographic projection of the battery cell group 12 on a plane perpendicular to the third direction C. The second end 317 of the first pipe 31 connected to the third pipe 35 is not provided with a stopper 80. The stopper 80 is used to install and position the thermal pad 70, thereby improving assembly efficiency.

[0103] Referring to Figures 2 and 11 , for example, the third width of the thermally conductive adhesive pad 70 is W3, which is greater than or equal to the first width W1. The second width W2 of the thermally conductive adhesive pad 70 is greater than or equal to the first width W1 of the first conduit 31, allowing the thermally conductive adhesive pad 70 to completely cover the surface of the first conduit 31. This ensures a sufficient area for heat exchange between the thermally conductive adhesive pad 70 and the first and second battery modules 10a, 10b, resulting in more efficient heat dissipation.

[0104] 11 , 12 and 13 , for example, along the first direction A, the first length of the cooling pipe 30 is L1, which is the effective length of the cooling pipe 30 in contact with the first battery module 10 a and the second battery module 10 b ; the second length of the thermal pad 70 is L2; ​​and the third length of the battery cell group 12 is L3. Preferably, the first length L1, the second length L2 and the third length L3 are the same.

[0105] Please refer to Figure 1. For example, the first battery module 10a also includes a confluence subsection 17, which is located at two opposite ends of the first battery module 10a in the first direction A. The cooling pipe 30 includes a third end 36 and a fourth end 38 opposite to each other along the first direction A. There is a gap between the third end 36 and the confluence subsection 17 near the third end 36, and between the fourth end 38 and the confluence subsection 17 near the fourth end 38.

[0106] Along the first direction A, the fourth width of the gap is W4 , and the fourth width W4 and the first width W1 satisfy: W1 ≤ W4 ≤ 3*W1 .

[0107] The heat generated at the confluence division 17 is relatively large, and the third end 36 and the fourth end 38 of the cooling pipe 30 are close to the confluence division 17. There is a gap between the third end 36 and the confluence division 17 close to the third end 36, as well as a gap between the fourth end 38 and the confluence division 17 close to the fourth end 38. The fourth width W4 of the gap is set to be greater than or equal to the first width W1 and less than 3 times the first width W1 to prevent the cooling pipe 30 from directly abutting the confluence division 17, and to ensure that there is a certain distance between the third end 36 and the confluence division 17, and between the fourth end 38 and the confluence division 17, so as to ensure the safety of the battery module. At the same time, it is ensured that the cooling pipe 30 can dissipate heat at the confluence division 17, effectively reducing the temperature near the confluence division 17.

[0108] 11 , 12 and 14 , for example, along the third direction C, the first thickness of the cooling pipe 30 is H1, the second thickness of the thermal pad 70 is H2, the third thickness of the distance between the first battery module 10a and the second battery module 10b is H3, and the first thickness H1, the second thickness H2 and the third thickness H3 satisfy: H1+2*H2≥H3.

[0109] The second thickness H2 of the thermally conductive adhesive pad 70 can be the thickness after compression. The first surface 311 and the second surface 313 of the first pipe 31 are both provided with thermally conductive adhesive pads 70. The sum of the first thickness of the cooling pipe 30 and the second thickness of the two thermally conductive adhesive pads 70 is set to a third thickness greater than or equal to the distance between the first battery module 10a and the second battery module 10b. Even if the thermally conductive adhesive pad 70 is squeezed and deformed by the first battery module 10a and the second battery module 10b, the thermally conductive adhesive pad 70 still has a certain thickness to ensure the heat exchange effect between the thermally conductive adhesive pad 70 and the first battery module 10a and the second battery module 10b.

[0110] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A cooling pipe (30), the cooling pipe (30) being used to cool a battery assembly (100), the cooling pipe (30) comprising a plurality of first pipes (31) arranged along a first direction and extending along a second direction, the first direction and the second direction intersecting, along the first direction, a first width of the first pipe (31) is W1, a second width between two adjacent first pipes (31) is W2, and the first width W1 and the second width W2 satisfy: W1≥1 / 3*W2.

2. The cooling pipe according to claim 1, wherein the cooling pipe (30) further comprises a second pipe (33), at least two adjacent first pipes (31) are connected via the second pipe (33), and an orthographic projection of the second pipe (33) on a plane perpendicular to the first direction and an orthographic projection of the first pipe (31) on a plane perpendicular to the first direction have an angle.

3. The cooling pipe according to claim 1 or 2, wherein the cooling pipe (30) further comprises a second pipe (33), at least two adjacent first pipes (31) are connected via the second pipe (33), and the orthographic projection of the second pipe (33) on a plane perpendicular to the second direction is a bent structure.

4. The cooling pipe according to claim 3, wherein the second pipe (33) is bent relative to the first pipe (31) along a third direction to enclose an accommodation space (331), the third direction, the first direction and the second direction intersect each other, and the accommodation space (331) is formed with an opening (332) on a side of the third direction facing the first pipe (31), and the accommodation space (331) is used to accommodate at least a portion of the support beam (11) of the battery assembly (100).

5. The cooling pipe according to claim 3, wherein the second pipe (33) comprises a plurality of second pipes (33), the plurality of second pipes (33) are arranged at intervals, at least one second pipe (33) is arranged on a first side (32) of the cooling pipe (30), and at least one second pipe (33) is arranged on a second side (34) of the cooling pipe (30), and the first side (32) and the second side (34) are opposite to each other in the second direction.

6. The cooling pipe according to any one of claims 1 to 6, wherein the cooling pipe (30) further comprises a third pipe (35), the third pipe (35) extending along the first direction, two partially adjacent first pipes (31) being connected via the third pipe (35), the orthographic projection of the cooling pipe (30) on a plane perpendicular to the third direction being symmetrical about the central axis of the cooling pipe (30) in the first direction, and the third direction being perpendicular to the first direction and the second direction.

7. A battery assembly (100), comprising a first battery module (10a), a second battery module (10b) and a cooling pipe (30) as described in any one of claims 1 to 5; the first battery module (10a), the cooling pipe (30) and the second battery module (10b) are arranged in sequence.

8. According to the battery assembly of claim 7, a support beam (11) extending along the second direction is provided at the bottom of the second battery module (10b), and the support beam (11) is located between two adjacent first pipes (31), and the support beam (11) is at least partially accommodated in the accommodating space (331) of the cooling pipe (30).

9. According to the battery assembly according to claim 7 or 8, a pull plate (13) is also provided at the end of the first battery module (10a) facing the cooling pipe (30), and the pull plate (13) extends along the second direction. The pull plate (13) is opposite to the third pipe (35) of the cooling pipe (30) in the second direction, and the pull plate (13) is accommodated between two first pipes (31) connected to the third pipe (35).

10. According to the battery assembly according to claim 9, the first battery module (10a) also includes end plates (15) arranged at both ends of the first battery module (10a) in the second direction, the ends of the pull plate (13) are connected to the end plates (15), and the orthographic projection of the third pipe (35) opposite to the pull plate (13) on a plane perpendicular to the third direction is located outside the orthographic projection of the first battery module (10a) on a plane perpendicular to the third direction, and the third direction intersects with the second direction.

11. According to the battery assembly of claim 10, at least a portion of the second pipe (33) of the cooling pipe (30) abuts against the outer surface of the end plate (15), and the support beam (11) includes a plurality of accommodating spaces (331) of each second pipe (33) accommodating at least a portion of the support beam (11).

12. According to the battery assembly according to claim 10 or 11, the battery assembly (100) further includes a first fixing member (50), at least a portion of the first fixing member (50) is located between two adjacent first pipes (31), the first fixing member (50) is formed with a first fixing hole (51), the end plate (15) is formed with a first matching member (151), and the first fixing hole (51) is matched and connected with the first matching member (151).

13. According to the battery assembly according to any one of claims 7 to 12, the battery assembly (100) further includes a thermally conductive adhesive pad (70), the first pipe (31) of the cooling pipe (30) includes a first surface (311) and a second surface (313), the first surface (311) and the second surface (313) are arranged relative to each other in a third direction, and the first surface (311) and the second surface (313) are both provided with the thermally conductive adhesive pad (70).

14. According to the battery assembly of claim 13, the first pipe (31) includes a first end (315) and a second end (317), the first end (315) and the second end (317) are arranged relative to each other in a second direction, the third direction is perpendicular to the second direction, and the first end (315) and / or the second end (317) are provided with a limiting portion (80), and the thermal conductive pad (70) abuts against the limiting portion (80).

15. The battery assembly according to claim 14, wherein along the first direction, the third width of the thermally conductive pad (70) is W3, the third width W3 is greater than or equal to the first width W1 of the first pipe (31), and the first direction, the third direction and the second direction are perpendicular to each other.

16. According to the battery assembly according to claim 15, the first battery module (10a) further includes a confluence section (17), the confluence section (17) is located at two opposite ends of the first battery module (10a) in the first direction, the cooling pipe (30) includes a third end (36) and a fourth end (38) opposite to each other along the first direction, and there is a gap between the third end (36) and the confluence section (17) close to the third end (36), and between the fourth end (38) and the confluence section (17) close to the fourth end (38). 17 . The battery assembly according to claim 16 , wherein along the first direction, a fourth width of the gap is W4 , and the fourth width W4 and the first width W1 satisfy: W1 ≤ W4 ≤ 3*W1 .

18. According to the battery assembly according to any one of claims 13 to 16, along the third direction, the first thickness of the cooling pipe (30) is H1, the second thickness of the thermal conductive pad (70) is H2, the third thickness of the distance between the first battery module (10a) and the second battery module (10b) is H3, and the first thickness H1, the second thickness H2 and the third thickness H3 satisfy: H1+2*H2≥H3.

19. An electrical device, comprising the battery assembly (100) according to any one of claims 7 to 18, wherein the battery assembly (100) is used to supply power to the electrical device.

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