Battery pack cooling assembly and battery pack

Abstract

The invention relates to a battery pack cooling assembly and a battery pack, the battery pack cooling assembly comprises a cold plate, the cold plate comprises a base plate and a plurality of protrusions located on the base plate, the protrusions are used for supporting battery cells, the protrusions extend in the first direction and are internally provided with cooling flow channels, a concave part is formed between every two adjacent protrusions, and the concave parts are used for containing the protruding parts. After the battery cell is placed on the cold plate, the convex part of the battery cell can be inserted into the concave part formed by the two adjacent bulges on the base plate, so that the convex part cannot interfere with the assembling and matching of the battery cell and the cold plate, and a smaller gluing gap is formed between the cold plate and the bottom surface of the battery cell; by means of the structure, the using amount of heat-conducting glue which is subsequently filled in gluing gaps is greatly reduced, the cost of manufacturing consumables is reduced, the overall weight of the battery pack is reduced, the energy density of the battery can be improved, the thickness of the heat-conducting glue is appropriate, cooling flow channels are formed in the protrusions, it can be guaranteed that high heat exchange efficiency is kept between the battery cells and the cold plate, and the service life of the battery pack is prolonged. And the cooling effect of the cold plate on the battery cell is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a battery pack cooling assembly and a battery pack. Background Art

[0002] At present, in order to meet the longer driving range and higher power requirements of new energy vehicles, the energy density and power density of power batteries are also constantly increasing. Along with this, the battery charge and discharge rates are constantly increasing, and the heat generation of the battery is also significantly increased. In order to avoid abnormal temperature increases that affect battery performance and even cause safety hazards, thermal management design of the battery is a very necessary protective measure.

[0003] Among the mainstream thermal management methods, cold plate heat dissipation is a widely used one. However, for the newly emerged blade batteries in recent years, in some special processes, the narrow bottom surface of the battery forms a protrusion, so that when the battery is assembled with the cold plate, the interference of the protrusion will cause a large gap layer between the narrow bottom surface of the battery and the cold plate. The gap layer needs to be filled with a large amount of thermal conductive glue, which will increase the manufacturing and consumables costs, increase the battery weight, and affect the battery energy density. On the other hand, the excessive thickness of the thermal conductive glue will also reduce the heat exchange efficiency and affect the cooling effect of the cold plate on the battery.

[0004] Existing cold plates are usually stamped cold plates, which are formed by welding the upper and lower plates, and the cooling channel is stamped out on the lower plate. The upper plate is designed as a flat plate. In order to solve the above-mentioned problem of the thickness of the glue layer, a specific shape can be manufactured on the upper plate to fill part of the gap in the glue layer, but it affects the flatness of the upper plate, resulting in inconsistent gaps in various areas, and ultimately leading to poor temperature uniformity of the entire package. In addition, both the upper and lower plates of the above-mentioned scheme need to be shaped, resulting in complex and costly flow channel design, and affecting the balance of the flow channel. For example, in patent CN218069976U, the cold plate includes a bottom plate, a cover plate and a reinforcement plate, and a cooling channel is stamped out on the bottom plate. In order to accommodate the protrusion (flanged structure), a containment structure is provided on the upper surface of the reinforcement plate, and the containment structure is a containment hole or a containment groove formed downward from the upper surface of the reinforcement plate; or the containment structure is directly provided on the cover plate. However, the cold plate in the patent is still a stamped cold plate, which is composed of multiple plates, and a receiving hole or receiving groove is formed on the upper surface of the reinforcing plate or the cover plate. The process is relatively complicated and has many process steps. Therefore, the cold plate solves the problem of the battery with a protruding part and the cold plate, but still has the defects pointed out in the above background technology. Summary of the invention

[0005] Based on this, it is necessary to provide a battery pack cooling assembly and a battery pack to address the defects in the above-mentioned background technology.

[0006] In one aspect, the present application provides a battery pack cooling assembly, wherein the bottom surface of the battery cell of the battery pack has a protrusion, and the battery pack cooling assembly comprises:

[0007] The cold plate comprises a substrate and a plurality of protrusions on the substrate, wherein the protrusions are used to support the battery core, the protrusions extend along a first direction and have cooling channels inside, and a recess is formed between two adjacent protrusions, and the recess is used to accommodate the protrusions.

[0008] The battery pack cooling assembly of the above scheme is equipped in the battery pack, and is specifically used to cooperate with the battery cell assembly so as to cool the battery cell during the battery pack charge and discharge cycle. Specifically, due to process and structural limitations, when the bottom surface of the battery cell has a protrusion, after the battery cell is placed on the cold plate, the protrusion of the battery cell can be inserted into the recess formed by two adjacent protrusions formed on the substrate, so that the protrusion cannot interfere with the assembly of the battery cell and the cold plate, thereby forming a smaller glue coating gap between the cold plate and the bottom surface of the battery cell, so that the amount of thermal conductive glue used to fill the glue coating gap is greatly reduced, the cost of manufacturing consumables is reduced, the overall weight of the battery pack is reduced, and it is helpful to improve the battery energy density. In addition, since the thickness of the thermal conductive glue is appropriate and a cooling flow channel is provided inside the protrusion, it can ensure that the heat exchange efficiency between the battery cell and the cold plate is maintained at a high level, and the cooling effect of the cold plate on the battery cell is ensured.

[0009] The technical solution of this application is further described below:

[0010] In one of the embodiments, the substrate and the protrusion are integrally formed by an extrusion process.

[0011] In one embodiment, the protrusions are arranged in multiple groups, each group of the protrusions includes a first protrusion and a second protrusion, the cooling channel in the first protrusion is a first channel, the cooling channel in the second protrusion is a second channel, and the first channel and the second channel in the same group are connected.

[0012] In one of the embodiments, the battery pack cooling assembly further includes a conducting plug, a connecting flow channel is provided in the conducting plug, and the same end of the first flow channel and the second flow channel in the same group are connected through the connecting flow channel.

[0013] In one of the embodiments, the battery pack cooling assembly further includes a profile beam, which extends along the second direction and is disposed on the cold plate. The interior of the profile beam has a drainage channel, and the drainage channel is connected to the cooling channel.

[0014] In one embodiment, the drainage channel is divided into a first cavity and a second cavity, the first flow channel is connected to the first cavity, and the second flow channel is connected to the second cavity.

[0015] In one embodiment, the upper wall surface of the first protrusion is provided with a first through hole, the lower wall surface of the profile beam is provided with a second through hole, and the first through hole and the second through hole are arranged opposite to each other so that the first flow channel is connected with the first cavity;

[0016] The upper wall surface of the second protrusion is provided with a third through hole, and the lower wall surface of the profile beam is further provided with a fourth through hole. The third through hole and the fourth through hole are arranged opposite to each other so that the second flow channel is connected with the second cavity.

[0017] In one embodiment, the first protrusions and the second protrusions are alternately arranged along the second direction; the first cavity and the second cavity extend along the second direction and are arranged side by side in the profile beam along the first direction.

[0018] On the other hand, the present application also provides a battery pack, comprising:

[0019] A plurality of battery cells, each having a protrusion on its bottom surface; and

[0020] In the battery pack cooling assembly as described above, the battery cell is arranged on the battery pack cooling assembly.

[0021] In one of the embodiments, the battery pack further includes a thermally conductive adhesive, and the thermally conductive adhesive is disposed between the upper wall surface of the protrusion and the bottom surface of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the explosion structure of a battery pack described in an embodiment of the present application.

[0025] Figure 2 for Figure 1 Schematic diagram of the top view structure.

[0026] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0027] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0028] Figure 5 This is a schematic diagram of the structure of a battery pack cooling assembly according to an embodiment of the present application.

[0029] Figure 6 for Figure 5 Schematic diagram of the local enlarged structure at point B in the middle.

[0030] Figure 7 for Figure 5 Schematic diagram of the structure of the intercooler plate.

[0031] Figure 8 for Figure 7 Schematic diagram of the local enlarged structure at point C in the middle.

[0032] Fig. 9 It is a schematic structural diagram of a profile beam according to an embodiment.

[0033] Fig.10 for Fig. 9 Schematic diagram of the local enlarged structure at point D in the middle.

[0034] Fig.11 This is a detailed diagram of the local structure of the connection between the cold plate and the profile beam.

[0035] Fig.12 This is a top view of the battery pack cooling assembly.

[0036] Fig.13 for Fig.12 Schematic diagram of the local enlarged structure at point E in the middle.

[0037] Description of reference numerals:

[0038] 100, battery pack; 10, battery pack cooling assembly; 11, cold plate; 111, substrate; 12, protrusion; 12a, first protrusion; 12b, second protrusion; 121, cooling channel; 121a, first channel; 121b, second channel; 122, first through hole; 123, third through hole; 13, recess; 20, battery cell; 21, protrusion; 30, glue coating gap; 40, profile beam; 41, drainage channel; 411, first cavity; 412, second cavity; 42, second through hole; 43, fourth through hole; 50, conduction plug. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0045] See also Figure 1 , is a battery pack of an embodiment of the present application, and the battery pack is specifically a secondary battery (Rechargeable battery), which is also called a rechargeable battery or storage battery. It refers to a battery that can be used to activate the active material by charging after the battery is discharged. A new battery can be constructed by utilizing the reversibility of chemical reactions, that is, after a chemical reaction is converted into electrical energy, the electrical energy can be used to repair the chemical system, and then the chemical reaction can be used to convert it into electrical energy, so it is called a secondary battery (rechargeable battery). The rechargeable batteries on the market mainly include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, polymer lithium-ion batteries, etc.

[0046] For example, in this embodiment, the battery pack 100 includes a plurality of battery cells 20 and a battery pack cooling assembly 10. The battery cells 20 are assembled with the battery pack cooling assembly 10, and the battery pack cooling assembly 10 is used to perform thermal management for the battery cells 20 to ensure that the battery cells 20 can continue to work safely.

[0047] Please continue reading Figures 1 to 7 , is a battery pack cooling assembly 10 shown in an embodiment of the present application, which includes a cold plate 11. It can be seen that the displayed cold plate 11 is a large rectangular plate. The cold plate 11 is generally made of metal material to ensure good heat transfer capability. In this embodiment, the cold plate 11 is a liquid cooling plate. Among them, according to the specific use environment of the battery pack, the cold plate 11 can cool or heat the battery cells in the battery pack. Of course, in some other embodiments, the cold plate 11 can also be an air-cooled plate.

[0048] The following describes an embodiment of the present invention by taking a cold plate cooling and dissipating heat for a battery pack as an example.

[0049] The cold plate 11 includes a substrate 111 and a plurality of protrusions 12 located on the substrate 111. A cooling channel 121 is formed inside the protrusion 12. The upper surface of the protrusion 12 is a bearing surface for supporting the battery cell. Specifically, the protrusion 12 is integrally formed with the substrate 111 through an extrusion process, that is, the substrate 111 and the protrusion 12 are an integrally formed structure, wherein the protrusion 12 protrudes from the substrate 111 toward the battery cell 20.

[0050] The protrusions 12 extend along a first direction and are parallel to the side of the cold plate 11, and a plurality of protrusions 12 are arranged side by side along a second direction. In this embodiment, the first direction is the width direction of the cold plate, and the second direction is the length direction of the cold plate. A recess 13 is formed between two adjacent protrusions 12, that is, the extending direction of the recess 13 is the same as the extending direction of the protrusion 12 and the extending direction of the cooling channel 121.

[0051] See also Figure 4 In some embodiments, the bottom surface of the battery cell of the battery pack has a protrusion 21, so the recess 13 is used to accommodate the protrusion 21 of the battery cell 20, so that the upper wall surface of the protrusion 12 fits with the bottom surface of the battery cell 20. Since the structure of the cold plate 11 avoids the protrusion 21 of the battery cell 20, only a thin adhesive layer is required between the bottom surface of the battery cell 20 and the protrusion 12 to achieve the installation and fixation of the battery cell 20.

[0052] In addition, in some other embodiments, the first direction is the length direction of the cold plate 11 , and the second direction is the width direction of the cold plate 11 , which does not deviate from the essence of the invention.

[0053] In summary, the technical solution of this embodiment will have the following beneficial effects: the battery pack cooling assembly 10 of the above solution is applied to the battery pack 100, and is used to assemble and cooperate with the battery cell 20, so as to cool the battery cell 20 when the battery pack 100 is working, thereby improving the effect of thermal management.

[0054] Specifically, due to process and structural limitations, when the bottom surface of the battery cell 20 has a protrusion 21, after the battery cell 20 is placed on the cold plate 11, the protrusion 21 of the battery cell 20 can be inserted into the recess 13 between the two protrusions 12 formed on the substrate 111, so that the protrusion 21 cannot interfere with the assembly and cooperation of the battery cell 20 and the cold plate 11, so that a smaller glue coating gap can be formed between the cold plate 11 and the bottom surface of the battery cell 20, so that the amount of thermal conductive glue subsequently filled in the glue coating gap 30 is greatly reduced, and the cold plate 11 adopts an extrusion one-piece molding process. Compared with the existing cold plate 11 using a stamping process to form the cooling channel 121, the extrusion process is less difficult to process, and the cooling channel 121 and the recess 13 for accommodating the protrusion 21 on the bottom surface of the battery cell 20 are formed at the same time, with fewer process steps, ensuring that the cold plate 11 is easier to process and manufacture. At the same time, the extrusion process makes the upper wall surface of the protrusion 12 have a very high flatness, further reducing the glue coating gap 30, thereby reducing the manufacturing consumables cost, reducing the overall weight of the battery pack 100, and helping to improve the battery energy density; and because the thickness of the thermal conductive glue is appropriate and controllable, and a cooling channel 121 is provided inside the protrusion 12, it can ensure that a high heat exchange efficiency is maintained between the battery cell 20 and the cold plate 11, ensuring the cooling effect of the cold plate 11 on the battery cell 20.

[0055] In this embodiment, the battery cell 20 is specifically a battery cell with a blade-shaped appearance. Due to the limitations of the manufacturing process and structure, a protrusion 21 is formed on its outer contour. Generally, the protrusion 21 of the battery cell 20 is formed on the bottom surface and / or the top surface of the battery cell 20. The bottom surface of the battery cell 20 is generally assembled with the bearing surface of the cold plate 11 and in heat transfer contact.

[0056] Of course, it is understandable that, in some other embodiments, the cold plate 11 can also be used to support cells without protrusions 21, such as conventional square shell cells or blade cells. Alternatively, in some other embodiments, the recess 13 formed on the cold plate 11 can also be used to accommodate other structures protruding from the surface of the cell 20, for example, when the square shell cell is inverted, the recess 13 can be used to accommodate the pole of the square shell cell.

[0057] On the basis of the above embodiment, a plurality of protrusions 12 are provided, and the plurality of protrusions 12 are arranged side by side along the length direction of the battery pack cooling assembly 10. The cold plate 11 is used to install a plurality of battery cells 20. A recess 13 is used to correspond to the protrusion 21 of a battery cell 20. The upper wall surfaces of all the protrusions 12 are at the same height, and the upper wall surfaces of every two adjacent protrusions 12 support the bottom surface of the same battery cell 20 at the same time.

[0058] It can be understood that loading multiple battery cells 20 on the cold plate 11 at the same time can greatly improve the energy density and power density of the battery pack 100, so that the battery pack 100 can meet the needs of long-life and high-power applications. At this time, multiple battery cells 20 are stacked along the length direction of the cold plate 11, such as Figure 1 Schematic diagrams of two columns of battery cells 20 are shown, and multiple battery cells 20 in each column are stacked along the length direction of the cold plate 11. Each battery cell 20 has two corresponding protrusions 12, that is, the protrusions 21 at the bottom of each battery cell 20 can be inserted into the corresponding recesses 13, so as to achieve the effect of anti-interference installation of multiple battery cells 20 at the same time, so as to ensure that the cold plate 11 and each battery cell 20 can effectively transfer heat, ensure the uniformity of heat transfer of the battery pack 100, and reduce the overall temperature difference of the battery pack 100.

[0059] Furthermore, the upper wall surfaces of the two protrusions 12 corresponding to each battery cell 20 are at the same height, and the two protrusions 12 are respectively located on both sides of the protruding portion 21, thereby forming a double-sided synchronous support for the battery cell 20 to ensure stable installation of the battery cell 20.

[0060] Furthermore, a thermally conductive adhesive is provided between the upper wall surface of the protrusion 12 and the bottom surface of the battery cell 20, so that the upper wall surface of the protrusion 12 is in heat transfer contact with the bottom surface of the battery cell 20 through the thermally conductive adhesive. The thermally conductive adhesive has a higher thermal conductivity, which helps to conduct the heat generated by the battery cell 20 to the cold plate 11 more quickly, thereby strengthening the cooling of the battery cell 20 by the cold plate 11. Optionally, the thermally conductive adhesive can be thermally conductive silicone or other thermally conductive materials with equivalent effects.

[0061] Please continue reading Figure 4 Furthermore, the width of the recess 13 is not less than the width of the protrusion 21, and the depth of the recess 13 is not less than the height of the protrusion 21. This can prevent the protrusion 21 from contacting the bottom surface of the recess 13, causing the protrusion 21 to be unable to be inserted into place, and prevent the gap between the bottom surface of the battery cell 20 and the cold plate 11 from being too large, and increasing the amount of thermal conductive adhesive used.

[0062] Please continue reading Figure 4 , Figures 6 to 13 The protrusions 12 are arranged in multiple groups, each group of protrusions 12 includes a first protrusion 12a and a second protrusion 12b, the cooling channel in the first protrusion 12a is a first channel 121a, the cooling channel in the second protrusion 12b is a second channel 121b, and the first channel 121a and the second channel 121b in the same group are connected.

[0063] It can be understood that the first flow channel 121a can be set as a liquid inlet flow channel, and the second flow channel 121b can be set as a liquid outlet flow channel. The coolant flows in from the liquid inlet flow channel and then flows out from the liquid outlet flow channel, thereby forming a cold liquid cycle. In this way, the coolant continues to flow along the second flow channel 121b after flowing through the first flow channel 121a, increasing the cooling and flow time in the cold plate 11, increasing the heat exchange time and heat exchange amount between the coolant and the battery cell 20, and enhancing the cooling effect of the cold plate 11 on the battery cell 20.

[0064] Please continue reading Figure 5 and Figure 6 Specifically, in this embodiment, the protrusion 12 is a square tube structure, and the cooling channel 121 runs through the opposite ends of the protrusion 12. In addition, the battery pack cooling assembly 10 also includes a conductive plug 50, and a connecting channel is provided in the conductive plug 50. The same end of the first channel 121a and the second channel 121b in the same group is connected through the connecting channel. In some embodiments, the conductive plug 50 is fixed to the two ends of the first protrusion 12a and the second protrusion 12b by brazing.

[0065] Please continue reading Figure 1 , Figure 4 and Figure 5 On the basis of any of the above embodiments, the battery pack cooling assembly 10 further includes a profile beam 40, which extends along the second direction and is disposed on the cold plate 11, and a drainage channel 41 is formed inside the profile beam 40, and the drainage channel 41 is connected to the cooling channel 121. In this way, by installing the profile beam 40 on the cold plate 11, the drainage channel 41 can transfer the coolant provided by the external coolant supply device to the cooling channel 121, so that the coolant flowing through the cold plate 11 can exchange heat with the battery cell 20, thereby achieving the effect of cooling and dissipating the heat of the battery cell 20.

[0066] Please continue reading Figures 11 to 13 As mentioned above, the two cooling channels 121 are respectively set as the first channel 121a and the second channel 121b, and the flow directions of the coolants in the first channel 121a and the second channel 121b are opposite; the drainage channel 41 is separated to form a first cavity 411 and a second cavity 412, the first channel 121a is connected to the first cavity 411, and the second channel 121b is connected to the second cavity 412.

[0067] It can be understood that the first cavity 411 is set as a liquid inlet cavity, the second cavity 412 is set as a liquid return cavity, and two adjacent protrusions 12 (i.e., the first protrusion 12a and the second protrusion 12b) form a group, that is, the same end of the two adjacent protrusions 12 is connected by a conductive plug 50, so that the first flow channel 121a and the second flow channel 121b can be connected through the connecting flow channel to form a circulation loop. The coolant flowing into the first cavity 411 from the outside first flows into the first flow channel 121a, and then flows from the first flow channel 121a through the connecting flow channel into the second flow channel 121b. In this way, the coolant flowing through the first flow channel 121a and the second flow channel 121b can cool down the same battery cell 20 twice in succession, thereby enhancing the cooling effect; finally, the coolant flows into the second cavity 412 from the second flow channel 121b, and flows back to the external coolant supply device to realize the recycling of the coolant.

[0068] Please continue reading Figures 7 to 13 In this embodiment, the profile beam 40 is fixed to the cold plate 11. Specifically, the profile beam 40 is fixed to the cold plate 11 by welding. Preferably, the profile beam 40 is connected and fixed to the cold plate 11 by brazing.

[0069] In each group of two protrusions 12, the upper wall surface of the first protrusion 12a provided with the first flow channel 121a is also provided with a first through hole 122, and the lower wall surface of the profile beam 40 is also provided with a second through hole 42 connected to the first cavity 411, and the first through hole 122 and the second through hole 42 are arranged opposite to each other so that the first flow channel 121a is connected to the first cavity 411; the upper wall surface of the second protrusion 12b provided with the second flow channel 121b is also provided with a third through hole 123, and the lower wall surface of the profile beam 40 is also provided with a fourth through hole 43 connected to the second cavity 412, and the third through hole 123 and the fourth through hole 43 are arranged opposite to each other so that the second flow channel 121b is connected to the second cavity 412.

[0070] For example, in this embodiment, the first through hole 122 and the second through hole 42 are both circular holes, and the apertures of the two circular holes are the same; the third through hole 123 and the fourth through hole 43 are both circular holes, and the apertures of the two circular holes are the same. This can avoid problems such as coolant leakage or poor circulation caused by mismatched apertures.

[0071] In this embodiment, the profile beam 40 is square and has a partition inside, which separates the drainage channel 41 into a first cavity 411 and a second cavity 412, wherein the first cavity 411 and the second cavity 412 are both strip-shaped channels with one end passing through one end of the profile beam 40 in the length direction, that is, the first cavity 411 and the second cavity 412 extend along the length direction of the cold plate.

[0072] For example, in this embodiment, the first protrusions 12a and the second protrusions 12b are alternately arranged along the second direction; the first cavity 411 and the second cavity 412 extend along the second direction and are arranged side by side along the first direction in the profile beam 40. In this way, a plurality of second through holes 42 are provided and arranged in a row along the second direction on the profile beam 40, and a plurality of fourth through holes 43 are provided and arranged in a row along the second direction on the profile beam 40; the first through holes 122 in each group of protrusions 12 are arranged in a row along the second direction on the cold plate 11, and the third through holes 123 in each group of protrusions 12 are arranged in a row along the second direction on the cold plate 11, so that the first through holes 122 arranged in a row and the third through holes 123 arranged in a row are arranged in a staggered manner in the first direction.

[0073] In this way, a row of first through holes 122 and a row of third through holes 123 arranged in a staggered manner in the width direction of the cold plate 11 can be aligned with the second through holes 42 and the fourth through holes 43 arranged in a row respectively and connected one by one, so that the first flow channels 121a and the second flow channels 121b in each group of protrusions 12 can form a circulation flow channel to achieve cooling and heat dissipation of battery cells 20 in different positions; and because each circulation flow channel only cooperates with a row of battery cells 20 arranged in the width direction of the cold plate 11 for heat transfer, the temperature change amplitude of the coolant is low, thereby ensuring that the cooling effect of each circulation flow channel on different battery cells 20 tends to be consistent, thereby achieving the effect of reducing the overall temperature difference of the battery pack 100.

[0074] In order to facilitate the connection between the profile beam 40 and the external coolant supply device, in some embodiments, a liquid inlet joint and a liquid return joint are provided at the end of the profile beam 40, the liquid inlet joint is connected to the first cavity 411, and the liquid return joint is connected to the second cavity 412. For example, the liquid inlet joint and the liquid return joint both adopt a quick-plug joint structure.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery pack cooling assembly, wherein the bottom surface of the battery cell of the battery pack has a protrusion, characterized in that: The battery pack cooling assembly comprises: The cold plate comprises a substrate and a plurality of protrusions on the substrate, wherein the protrusions are used to support the battery core, the protrusions extend along a first direction and have cooling channels inside, and a recess is formed between two adjacent protrusions, and the recess is used to accommodate the protrusions.

2. The battery pack cooling assembly according to claim 1, characterized in that: The substrate and the protrusion are integrally formed through an extrusion process.

3. The battery pack cooling assembly according to claim 1, characterized in that: The protrusions are arranged in multiple groups, each group of the protrusions includes a first protrusion and a second protrusion, the cooling channel in the first protrusion is a first channel, the cooling channel in the second protrusion is a second channel, and the first channel and the second channel in the same group are connected.

4. The battery pack cooling assembly according to claim 3, characterized in that: The battery pack cooling assembly also includes a conducting plug, in which a connecting flow channel is provided, and the same end of the first flow channel and the second flow channel in the same group are connected through the connecting flow channel.

5. The battery pack cooling assembly according to claim 3 or 4, characterized in that: The battery pack cooling assembly further includes a profile beam, which extends along the second direction and is disposed on the cold plate. The profile beam has a drainage channel inside, and the drainage channel is communicated with the cooling channel.

6. The battery pack cooling assembly according to claim 5, characterized in that: The drainage channel is divided into a first cavity and a second cavity, the first flow channel is communicated with the first cavity, and the second flow channel is communicated with the second cavity.

7. The battery pack cooling assembly according to claim 6, characterized in that: The upper wall surface of the first protrusion is provided with a first through hole, and the lower wall surface of the profile beam is provided with a second through hole, and the first through hole and the second through hole are arranged opposite to each other so that the first flow channel is connected with the first cavity; The upper wall surface of the second protrusion is provided with a third through hole, and the lower wall surface of the profile beam is further provided with a fourth through hole. The third through hole and the fourth through hole are arranged opposite to each other so that the second flow channel is connected with the second cavity.

8. The battery pack cooling assembly according to claim 7, characterized in that: The first protrusions and the second protrusions are alternately arranged along the second direction; the first cavity and the second cavity extend along the second direction and are arranged side by side in the profile beam along the first direction.

9. A battery pack, characterized in that: include: A plurality of battery cells, each having a protrusion on its bottom surface; and The battery pack cooling assembly according to any one of claims 1 to 8, wherein the battery cell is arranged on the battery pack cooling assembly.

10. The battery pack according to claim 9, characterized in that: The battery pack further includes a thermally conductive adhesive, which is disposed between the upper wall surface of the protrusion and the bottom surface of the battery cell.

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