Battery pack cooling device, battery pack and power-consuming device

Abstract

The utility model discloses a cooling device for a battery pack, a battery pack and an electric device. The cooling device for the battery pack comprises: a cooling plate (1), comprising a cooling plate body (11) provided with a flow path (13) for circulating a cooling medium, and a protrusion (12) protruding from the cooling plate body (11) along a first direction, wherein the protrusion (12) is provided with a first interface connected to the flow path (13); a cooling medium joint (3), provided with a second interface (31) connected to the first interface, wherein the cooling medium joint (3) is connected to the protrusion (12) via a weld (6) extending along an edge of the protrusion (12), wherein the weld (6) is a fusion weld.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] The battery pack of new energy electric vehicles is the energy storage system of all pure electric vehicles and plug-in hybrid electric vehicles. It is composed of multiple battery cells. The battery pack is usually equipped with a cooling plate for cooling the battery cells. The cooling plate is provided with a cooling medium flow path. The cooling plate is also connected to a cooling medium joint. The cooling medium joint is used to transport the external cooling medium into the cooling plate or transport the cooling medium in the cooling plate to the outside. The connection method between the cooling medium joint and the cooling plate is prone to failure. Utility Model Content

[0003] The utility model aims to provide a cooling device for a battery pack, a battery pack and an electric device, so as to improve the problem that the connection mode between a cooling medium joint and a cooling plate existing in the prior art is prone to failure.

[0004] According to one aspect of the present application, a cooling device for a battery pack is provided, the cooling device comprising: a cooling plate, comprising a cooling plate body provided with a flow path for circulating a cooling medium and a protrusion protruding from the cooling plate body along a first direction, the protrusion being provided with a first interface connected to the flow path; and a cooling medium joint, provided with a second interface docked with the first interface, the cooling medium joint being connected to the protrusion by a weld extending along an edge of the protrusion, the weld being a fusion weld.

[0005] In some embodiments, the weld is a friction stir weld.

[0006] In some embodiments, the protrusion is plate-shaped and coplanar with the cooling plate body, the protrusion is overlapped on the cooling medium joint, the first interface is arranged on the side of the protrusion facing the cooling medium joint, and the second interface is arranged on the side of the cooling medium joint facing the protrusion.

[0007] In some embodiments, the cooling device also includes a supporting base, which includes a first supporting portion supporting the cooling plate body and an installation groove arranged at one end of the first supporting portion, and at least part of the protrusion and at least part of the cooling medium joint are arranged in the installation groove.

[0008] In some embodiments, a weld connects the carrier base, the projection, and the cooling medium joint.

[0009] In some embodiments, a protrusion groove is formed on the cooling medium joint or a protrusion groove is formed on the combination of the cooling medium joint and the supporting base, the protrusion groove is adapted to the protrusion, and at least the thickness of the edge of the protrusion is consistent with the depth of the protrusion groove, the protrusion is arranged in the protrusion groove, and the weld extends along the edge of the protrusion groove.

[0010] In some embodiments, the cooling medium joint includes a medium connecting portion provided with a second interface and a second bearing portion connected to the medium connecting portion and arranged in the mounting groove, the protrusion is stacked on a side of the second bearing portion away from the bearing base, the protrusion embedding groove includes a first protrusion embedding groove arranged on the medium connecting portion and a second protrusion embedding groove formed on a side of the second bearing portion away from the bearing base and connected to the first protrusion embedding groove, and the second interface is located at the bottom of the first protrusion embedding groove.

[0011] In some embodiments, the seating groove includes: a first seating groove, whose depth direction is consistent with the thickness direction of the protrusion; a second seating groove, which is arranged at the bottom of the first seating groove and extends from the side of the first seating groove toward the bearing base along a second direction perpendicular to the first direction; and the second bearing part includes a first part located in the first seating groove and a second part located in the second seating groove, the bearing base includes a connecting part superimposed on the second part, the protrusion is superimposed on the first part and connected to the connecting part, and the weld is formed at the intersection of the connecting part, the protrusion and the second bearing part.

[0012] In some embodiments, the side edge of the connecting portion adjacent to the protrusion forms an edge of the second protrusion embedding groove.

[0013] In some embodiments, the cooling medium joint further comprises a protrusion disposed on the second bearing portion and located at one end of the protrusion along the second direction, the protrusion extends along the first direction, the second direction is perpendicular to the first direction, and the protrusion forms an edge of the second protrusion groove.

[0014] In some embodiments, the cooling plate body is welded to the first bearing portion, and the welding method of the cooling plate body and the first bearing portion is the same as the welding method of the protruding portion and the cooling medium joint.

[0015] In some embodiments, the supporting base is also provided with a body embedding groove adapted to the cooling plate body, the body embedding groove is connected to the above-mentioned protruding portion embedding groove to form an integral embedding groove adapted to the cooling plate, and the cooling plate and the supporting base are connected together by a weld extending along the edge of the integral embedding groove.

[0016] According to another aspect of the present application, a battery pack is also provided, the battery pack comprising the cooling device as claimed above.

[0017] According to another aspect of the present application, an electric device is also provided, and the electric device includes the above-mentioned battery pack.

[0018] By applying the technical solution of the present application, the cooling medium joint and the protrusion of the cooling plate are connected together by fusion welding, which is beneficial to ensure the firmness of the two after welding, prevent failure of the connection between the two, and prevent the two from shaking relative to each other and affecting the seal between them.

[0019] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 creative labor.

[0021] Figure 1 A schematic structural diagram of an electric device disclosed in some embodiments of the present application is shown.

[0022] Figure 2 A schematic diagram of the exploded structure of a battery pack disclosed in some embodiments of the present application is shown.

[0023] Figure 3 A schematic structural diagram of a battery cell disclosed in some embodiments of the present application is shown.

[0024] Figure 4 A schematic diagram of the three-dimensional structure of a cooling device for a battery pack disclosed in some embodiments of the present application is shown.

[0025] Figure 5 A structural schematic diagram of another side of a cooling device for a battery pack disclosed in some embodiments of the present application is shown.

[0026] Figure 6 A schematic structural diagram of a support base and a cooling medium connector of a cooling device for a battery pack disclosed in some embodiments of the present application is shown.

[0027] Figure 7 Shows Figure 6 A local enlarged view of point A in the figure.

[0028] Figure 8 A schematic structural diagram of a cooling medium connector of a cooling device for a battery pack disclosed in some embodiments of the present application is shown.

[0029] Fig. 9 A schematic structural diagram of a cooling device for a battery pack disclosed in some embodiments of the present application is shown.

[0030] Fig.10 Shows Fig. 9 Schematic diagram of the cross-sectional structure of the cooling medium joint and the bearing base at the middle BB.

[0031] Fig.11 Shows Fig. 9 Schematic diagram of the cross-sectional structure of the bearing base at BB in the middle.

[0032] Fig.12 A schematic structural diagram of a cooling device for a battery pack disclosed in some embodiments of the present application is shown.

[0033] Fig.13 Shows Fig.12 Schematic diagram of the cross-sectional structure of the cooling medium joint and the bearing base at CC.

[0034] Fig.14 A schematic diagram of the exploded structure of a cooling device for a battery pack disclosed in some other embodiments of the present application is shown.

[0035] Fig.15 Shows Fig.14 A partial enlarged view of .

[0036] Fig.16 A schematic structural diagram of a support base and a cooling medium connector of a cooling device for a battery pack disclosed in some other embodiments of the present application is shown.

[0037] Fig.17 Shows Fig.16 A partial enlarged view of point D in the middle.

[0038] Fig.18 A schematic diagram of the three-dimensional structure of a cooling medium connector of a cooling device for a battery pack disclosed in some other embodiments of the present application is shown.

[0039] Fig.19 A schematic diagram of the three-dimensional structure of a cooling medium joint of a cooling device of a battery pack disclosed in some other embodiments of the present application is shown from another angle.

[0040] Fig. 20 A schematic diagram of the three-dimensional structure of a cooling medium joint of a cooling device of a battery pack disclosed in some other embodiments of the present application is shown from another angle.

[0041] Fig.21 A schematic structural diagram of a cooling device for a battery pack disclosed in some other embodiments of the present application is shown.

[0042] Fig. 22 Shows Fig.21 Schematic diagram of the cross-sectional structure of the cooling medium joint and the supporting base at EE.

[0043] Fig.23 Shows Fig.21 Schematic diagram of the cross-sectional structure of the supporting base at EE.

[0044] Fig.24 A schematic diagram of the three-dimensional structure of a cooling plate and a cooling medium connector of a cooling device for a battery pack disclosed in other embodiments of the present application is shown.

[0045] Fig.25 A schematic structural diagram of a cooling plate and a cooling medium joint of a cooling device for a battery pack disclosed in some other embodiments of the present application is shown.

[0046] Fig.26 Shows Fig.21 Schematic diagram of the cross-sectional structure of the supporting base at FF.

[0047] In the figure: 1000, vehicle; 100, battery pack; 110, housing; 111, first part of housing; 112, second part of housing; 120, battery cell; 121, end cap; 121a, electrode terminal; 122, housing; 123, battery cell assembly; 123a, tab; 200, controller; 300, motor; 1, cooling plate; 11, cooling plate body; 12, protrusion; 13, flow path; 2, supporting base; 21, first supporting part; 22. Receiving groove; 221. First receiving groove; 222. Second receiving groove; 23. Connecting part; 24. Main body embedded groove; 3. Cooling medium joint; 31. Second interface; 32. Medium connecting part; 33. Second bearing part; 331. First part; 332. Second part; 34. Protrusion; 35. Boss; 36. Cooling medium port; 4. Protruding part embedded groove; 41. First protruding part embedded groove; 42. Second protruding part embedded groove; 5. Dotted line; 6. Welding seam. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do 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. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0050] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0051] Further, " scope " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be including end value or not including end value, and can be combined arbitrarily, that is, any lower limit can form a scope with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for a particular parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 listed, and if the maximum range value 3,4 and 5 are listed, the following scope can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0052] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0053] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0054] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0055] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0056] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0057] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0058] Figure 1 FIG. 1 shows a schematic diagram of a structure of an electric device using a battery as a power source; Figure 1As shown, the power-consuming device of this embodiment includes a vehicle 1000, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery pack 100 is disposed inside the vehicle 1000, and the battery pack 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery pack 100 may be used to power the vehicle 1000, for example, the battery pack 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0059] In some embodiments of the present application, the battery pack 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2 An exploded view of a battery pack 100 provided for some embodiments of the present application. The battery pack 100 includes a case 110 and a battery module disposed in the case 110, the battery module includes a plurality of battery cells 120, and the battery cells 120 are contained in the case 110. Among them, the case 110 is used to provide a storage space for the battery cells 120, and the case 110 can adopt a variety of structures. In some embodiments, the case 110 may include a first case portion 111 and a second case portion 112, the first case portion 111 and the second case portion 112 cover each other, and the first case portion 111 and the second case portion 112 jointly define a storage space for accommodating the battery cells 120. The second box part 112 may be a hollow structure with one end open, and the first box part 111 may be a plate-like structure, and the first box part 111 covers the open side of the second box part 112, so that the first box part 111 and the second box part 112 jointly define a storage space; the first box part 111 and the second box part 112 may also be hollow structures with one side open, and the open side of the first box part 111 covers the open side of the second box part 112. Of course, the box 110 formed by the first box part 111 and the second box part 112 may be in various shapes, such as a cylinder, a cuboid, etc.

[0061] In the battery pack 100, there may be multiple battery cells 120, and the multiple battery cells 120 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 120 are both connected in series and in parallel. The multiple battery cells 120 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 120 is accommodated in the box 110; of course, the battery pack 100 may also be a battery module formed by connecting multiple battery cells 120 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 110. The battery pack 100 may also include other structures, for example, the battery pack 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 120.

[0062] Each battery cell 120 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 may be cylindrical, flat, rectangular, or in other shapes.

[0063] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposition structure of the battery cell 120 provided in some embodiments of the present application. The battery cell 120 refers to the smallest unit constituting the battery pack 100. Figure 3 The battery cell 120 includes an end cover 121, a shell 122, a battery cell assembly 123 and other functional components.

[0064] The end cap 121 refers to a component that covers the opening of the shell 122 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 121 can be adapted to the shape of the shell 122 to match the shell 122. Optionally, the end cap 121 can be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the end cap 121 is not easily deformed when squeezed and collided, so that the battery cell 120 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 121a can be provided on the end cap 121. The electrode terminal 121a can be used to electrically connect to the battery cell assembly 123 for outputting or inputting electrical energy of the battery cell 120. In some embodiments, the end cap 121 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold. The material of the end cap 121 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the present embodiment. In some embodiments, an insulating member can be provided on the inner side of the end cap 121, and the insulating member can be used to isolate the electrical connection components in the housing 122 from the end cap 121 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0065] The shell 122 is a component used to cooperate with the end cap 121 to form the internal environment of the battery cell 120, wherein the formed internal environment can be used to accommodate the battery cell assembly 123, electrolyte and other components. The shell 122 and the end cap 121 can be independent components, and an opening can be set on the shell 122, and the internal environment of the battery cell 120 is formed by covering the opening with the end cap 121 at the opening. Without limitation, the end cap 121 and the shell 122 can also be integrated. Specifically, the end cap 121 and the shell 122 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 122, the end cap 121 covers the shell 122. The shell 122 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 122 can be determined according to the specific shape and size of the battery cell assembly 123. The shell 122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special limitation on this.

[0066] The cell assembly 123 is a component where electrochemical reactions occur in the battery cell 120. The housing 122 may contain one or more cell assemblies 123. The cell assembly 123 is mainly formed by winding or stacking pole sheets, wherein the pole sheets include a positive pole sheet and a negative pole sheet, and a separator is usually provided between the positive pole sheet and the negative pole sheet.

[0067] The electrode sheet mainly includes a thin sheet-shaped current collector and an active material coated on the current collector. The parts of the positive electrode sheet (cathode electrode sheet) and the negative electrode sheet (anode electrode sheet) with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab 123a. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery pack 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 123a connects the electrode terminal to form a current loop.

[0068] Since the battery pack generates a lot of heat during operation, if the temperature of the battery pack is too high, it may cause the battery pack to deform or even cause thermal runaway. In order to reduce the temperature of the battery pack, a cooling device for cooling the battery cells is also provided in the battery pack. The cooling device includes a supporting base, a cooling plate laid on the supporting base and provided with a circulating cooling medium, and a cooling medium connector connected to the cooling plate. In some embodiments, the cooling device also includes a protective plate covering the side of the cooling plate away from the supporting base.

[0069] In some embodiments, the cooling device is disposed at the bottom of the box of the battery pack, and a plurality of battery cells are disposed side by side above the cooling device.

[0070] The cooling plate is installed on the supporting base through a threaded connector, and the cooling medium joint and the cooling plate are connected together through a threaded connector. During the production, transportation, installation, testing and use of the battery pack, it is easy for the water-cooled plate and the cooling medium joint to shake relative to each other, or for both to shake separately or together relative to the supporting base, resulting in deformation, loosening, deviation, falling or sealing failure.

[0071] In order to improve the above technical problems, this embodiment provides a cooling device for a battery pack. Figures 4 to 10 and Figures 14 to 19 As shown, the cooling device comprises a cooling plate 1 and a cooling medium connection 3 .

[0072] The cooling plate 1 comprises a cooling plate body 11 provided with a flow path 13 for circulating a cooling medium, and a protrusion 12 protruding from the cooling plate body 11 along a first direction, wherein a first interface communicating with the flow path 13 is provided on the protrusion 12 .

[0073] The cooling medium joint 3 is provided with a second interface 31 docked with the first interface. The cooling medium joint 3 is connected to the protrusion 12 via a weld 6 extending along the edge of the protrusion 12. The weld 6 is a fusion weld.

[0074] In this embodiment, the cooling medium joint 3 and the protrusion 12 of the cooling plate 1 are connected by fusion welding, which is beneficial to ensure the firmness of the two after welding, prevent the connection between the two from failing, and prevent the two from shaking relative to each other and affecting the seal between them.

[0075] Among them, fusion welding is a welding method in which the connection of at least two workpieces to be connected together is melted under the action of high temperature and then solidified to achieve connection, which can form a strong welded joint. The difference between fusion welding and brazing is that brazing refers to a welding method in which the solder with a lower melting point than the parts to be connected and the workpieces to be connected are heated to the melting temperature of the solder at the same time, and the gap of the solid workpiece is filled with liquid solder to connect the metals.

[0076] In some embodiments, the weld 6 is a friction stir welding weld. Friction stir welding refers to using the heat generated by the friction between the high-speed rotating welding tool and the workpiece to partially melt the welded workpiece. When the welding tool moves forward along the welding interface, the plasticized material flows from the front of the welding tool to the rear under the action of the rotating friction force of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool.

[0077] The microstructure of the heat-affected zone of the welded joint formed by friction stir welding changes little, the residual stress is relatively low, and the welded workpiece is not easy to deform, which is conducive to ensuring the dimensional accuracy of the cooling device and the firmness of the welding.

[0078] The protrusion 12 is plate-shaped and coplanar with the cooling plate body 11 . The protrusion 12 is superimposed on the cooling medium joint 3 . The first interface is provided on the side of the protrusion 12 facing the cooling medium joint 3 . The second interface 31 is provided on the side of the cooling medium joint 3 facing the protrusion 12 .

[0079] Furthermore, combined with Figure 5 , 6 As shown in Figures 7 and 9, the protrusion 12 is overlapped with the cooling medium joint 3 to connect the two, and the weld extends along the edge of the protrusion 12, which can not only achieve a firm connection between the cooling medium joint 3 and the protrusion 12, but also seal the two. Compared with the solution of connecting the two through a threaded connector and arranging a sealing gasket between the two, the solution of this embodiment has not only fewer parts but also good sealing effect.

[0080] See further Figures 9 to 13 The cooling device also includes a supporting base 2, which includes a first supporting portion 21 supporting the cooling plate body 11 and a placement groove 22 arranged at one end of the first supporting portion 21, and at least part of the protrusion 12 and at least part of the cooling medium joint 3 are arranged in the placement groove 22.

[0081] Placing the cooling plate 1 and the cooling medium connector 3 in the mounting groove 22 is beneficial to reducing the protrusion of the cooling medium connector 3 toward the supporting base 2, improving the flatness of the cooling device, and reducing the collision between the cooling device and other components and the space occupied, thereby reducing the volume of the battery pack or increasing the energy density of the battery pack.

[0082] See also Fig. 9 and Fig.10 The weld 6 connects the bearing base 2, the protrusion 12 and the cooling medium joint 3. The weld 6 is formed at the junction of the bearing base 2, the protrusion 12 and the cooling medium joint 3, and connects the three together, which is beneficial to improve the integrity and firmness of the cooling device. It effectively prevents the three from shaking relative to each other and causing sealing failure.

[0083] See also Figure 7-8 and Figures 17 to 20 The cooling medium joint 3 is formed with a protrusion embedding groove 4 or the combination of the cooling medium joint 3 and the supporting base 2 is formed with a protrusion embedding groove 4, the protrusion embedding groove 4 is adapted to the protrusion 12, and at least the thickness of the edge of the protrusion 12 is consistent with the depth of the protrusion embedding groove 4, the protrusion 12 is arranged in the protrusion embedding groove 4, and the weld extends along the edge of the protrusion embedding groove 4.

[0084] The protrusion 12 is embedded in the protrusion embedding groove 4, and the depth of the protrusion embedding groove 4 is consistent with the thickness of the edge of the protrusion 12, which further improves the flatness of the cooling medium, helps to reduce the collision between the cooling device and other components and the space occupied, thereby reducing the volume of the battery pack or improving the energy density of the battery pack. Furthermore, the edge of the protrusion 12 is flush with the outer edge of the protrusion embedding groove 4, which is conducive to stir friction welding. Furthermore, the weld extending along the edge of the protrusion embedding groove 4 can ensure the sealing between the protrusion 12 and the cooling medium joint 3.

[0085] The cooling medium joint 3 includes a medium connecting portion 32 provided with a second interface 31 and a second bearing portion 33 connected to the medium connecting portion 32 and arranged in the placement groove 22. The protrusion 12 is superimposed on a side of the second bearing portion 33 away from the bearing base 2. The protrusion embedding groove 4 includes a first protrusion embedding groove 41 arranged on the medium connecting portion 32 and a second protrusion embedding groove 42 formed on a side of the second bearing portion 33 away from the bearing base 2 and connected to the first protrusion embedding groove 41. The second interface 31 is arranged at the bottom of the second protrusion embedding groove 42. Figure 7 , the dot-dash line 5 shows the boundary between the first protrusion embedding groove 41 and the second protrusion embedding groove 42.

[0086] The second bearing portion 33 of the cooling medium joint 3 is embedded in the placement groove 22, the medium communication portion 32 is located outside the bearing base 2 to communicate with the external cooling medium pipeline, a portion of the protrusion 12 is embedded in the first protrusion embedding groove 41, and another portion is embedded in the second protrusion embedding groove 42, and the weld 6 extending along the edge of the protrusion embedding groove 4 seals and firmly connects the protrusion 12 and the cooling medium joint 3. This is beneficial to prevent the cooling medium joint 3, the bearing base 2 and the protrusion 12 from shaking relative to each other to prevent sealing failure.

[0087] See also Figures 8 to 10 as well as Figures 14 to 20 As shown, a boss 35 is provided on the side of the medium connecting portion 32 of the cooling medium joint 3 facing away from the protruding portion 12. A cooling medium port 36 is provided on the boss 35, and the cooling medium port 36 is connected to the second interface 31. The side of the medium connecting portion 32 facing away from the cooling boss 35 is substantially flush with the protruding portion 12 embedded in the protruding portion embedding groove 4.

[0088] In some embodiments of the present application, see Figure 6-8 as well as Figure 10-11 The placement groove 22 includes a first placement groove 221 and a second placement groove 222. The depth direction of the first placement groove 221 is consistent with the thickness direction of the protrusion 12. The second placement groove 222 is arranged at the bottom of the first placement groove 221 and extends from the side of the first placement groove 221 along a second direction perpendicular to the first direction toward the inside of the bearing base 2.

[0089] The second bearing portion 33 includes a first portion 331 located in the first mounting groove 221 and a second portion 332 located in the second mounting groove 222, the bearing base 2 includes a connecting portion 23 superimposed on the second portion 332, the protrusion 12 is superimposed on the first portion 331 and connected to the connecting portion 23, and a weld is formed at the intersection of the connecting portion 23, the protrusion 12 and the second bearing portion 33.

[0090] The butt joint between the edge of the connecting portion 23 and the protruding portion 12 and the interface between the second bearing portion 33 and the connecting portion 23 and the protruding portion 12 form a T-shaped structure. The weld 6 is formed at the junction of the connecting portion 23, the protruding portion 12 and the second bearing portion 33 to connect the three together. This is beneficial to improving the integrity and firmness of the cooling device. It effectively prevents the three from shaking relative to each other and causing sealing failure. Furthermore, the second bearing portion 33 is stuck on the inner side of the connecting portion 23, which is beneficial to preventing the cooling medium joint 3 from detaching from the bearing base 2.

[0091] The second placement groove 222 extends inward from the inner surface of the bearing base 2 , and the second bearing portion 33 of the cooling medium connector 3 can be inserted into the second placement groove 222 from the outer side of the bearing base 2 .

[0092] The second bearing portion 33 is a plate-shaped component extending away from the medium connecting portion 32 along the first direction. In some embodiments, two second bearing portions 33 are respectively provided at two ends of the medium connecting portion 32 along the second direction, wherein the second direction is perpendicular to the first direction. The second protrusion embedding groove 42 is formed between the connecting portions 23 on the two second bearing portions 33.

[0093] In some embodiments, the side of the connecting portion 23 adjacent to the protruding portion 12 forms the edge of the second protruding portion embedding groove 42, and the weld 6 is formed at the junction of the connecting portion 23, the protruding portion 12 and the second bearing portion 33 to connect the three together. This is beneficial to improving the integrity and firmness of the cooling device and effectively preventing the three from shaking relative to each other and causing sealing failure.

[0094] See also Figures 14 to 26 In some other embodiments of the present application, the cooling medium joint 3 also includes a protrusion 34 provided on the second bearing portion 33 and located at one end of the protrusion 12 along the second direction, the protrusion 34 extends along the first direction, the second direction is perpendicular to the first direction, and the protrusion 34 forms the edge of the second protrusion groove 42.

[0095] Further, see Fig. 22 and 23The placement groove 22 is rectangular, the second bearing portion 33 and the protrusion 34 are embedded in the placement groove 22, and the protrusions 34 on the two second bearing portions 33 are located at both ends of the second protrusion embedding groove 42. The gap between the protrusion 34 and the edge of the protrusion 12 and the interface between the second bearing portion 33 and the protrusion 12 form an L-shaped structure.

[0096] In this embodiment, the structure of the mounting groove 22 is simple and easy to process, and it can also realize the installation and fixation of the cooling plate 1. The cooling device has high stability, which is beneficial to improving the integrity and firmness of the cooling device, and effectively preventing the three from shaking relative to each other and causing sealing failure.

[0097] In some embodiments, the cooling plate body 11 is welded to the first bearing portion 21 . The welding method of the cooling plate body 11 and the first bearing portion 21 is the same as the welding method of the protrusion 12 and the cooling medium joint 3 .

[0098] The connection between the cooling plate body 11 and the first bearing portion 21 and the connection between the protruding portion 12 and the cooling medium joint 3 are in the same manner, which is beneficial to simplifying the production process, improving processing efficiency and reducing production costs.

[0099] In some embodiments, see Figure 6 and 7 The bearing base 2 is also provided with a body embedding groove 24 adapted to the cooling plate body 11, and the body embedding groove 24 is connected with the above-mentioned protruding portion embedding groove 4 to form an integral embedding groove adapted to the cooling plate 1, and the cooling plate 1 and the bearing base 2 are connected together by a weld extending along the edge of the integral embedding groove. After the cooling plate 1 is installed on the bearing base 2, the connection between the cooling plate body 11 and the bearing base 2 and the connection between the protruding portion 12 and the cooling medium joint 3 can be completed by welding technology, which is conducive to simplifying the production process, improving processing efficiency and reducing production costs.

[0100] exist Figures 4 to 13 In the embodiment shown, the external cooling medium joint 3 has a supporting structure (second bearing part 33) required for friction stir welding (FSW), so that the cooling plate 1, the water cooling medium joint 3 and the frame (bearing base 2) form a T-shaped structure suitable for friction stir welding, realizing a circle of welding. The T-shaped structure has two second bearing parts 33 for welding at the tail end of the external cooling medium joint 3. When the bearing base 2 is milled in the X direction, the cavity wall thickness of the reverse sealing surface retains half of the width of the supporting structure without milling, so that the second bearing part 33 can be inserted therein to form a half T-shaped structure. Then the cooling plate is overlapped on the other half of the supporting structure to form the other half of the T-shaped structure.

[0101] exist Figures 14 to 26In the embodiment shown, the protrusion 34 on the second bearing portion 33 forms a butt-joint structure with the protrusion 12. Two FSW support structures (composed of the second bearing portion 33 and the protrusion 34) are designed at the tail end of the external cooling medium joint 3. The support structure is designed to be L-shaped and forms a butt-joint structure after being matched with the cold plate.

[0102] The above are merely exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling device for a battery pack, characterized in that: include: A cooling plate (1) comprising a cooling plate body (11) provided with a flow path (13) for circulating a cooling medium, and a protruding portion (12) protruding from the cooling plate body (11) along a first direction, wherein the protruding portion (12) is provided with a first interface communicating with the flow path (13); and A cooling medium joint (3) is provided with a second interface (31) docked with the first interface, the cooling medium joint (3) and the protruding portion (12) being connected via a weld (6) extending along an edge of the protruding portion (12), the weld (6) being a fusion weld.

2. The cooling device according to claim 1, characterized in that: The weld (6) is a friction stir welding weld.

3. The cooling device according to claim 1, characterized in that: The protrusion (12) is plate-shaped and coplanar with the cooling plate body (11); the protrusion (12) is superimposed on the cooling medium joint (3); the first interface is provided on a side of the protrusion (12) facing the cooling medium joint (3); and the second interface (31) is provided on a side of the cooling medium joint (3) facing the protrusion (12).

4. The cooling device according to any one of claims 1 to 3, characterized in that: It also includes a bearing base (2), the bearing base (2) including a first bearing portion (21) for bearing the cooling plate body (11) and a placement groove (22) provided at one end of the first bearing portion (21), at least part of the protrusion (12) and at least part of the cooling medium joint (3) being provided in the placement groove (22).

5. The cooling device according to claim 4, characterized in that: The weld (6) connects the bearing base (2), the protruding portion (12) and the cooling medium joint (3).

6. The cooling device according to claim 4, characterized in that: The cooling medium joint (3) is formed with a protrusion embedding groove (4) or the combination of the cooling medium joint (3) and the bearing base (2) is formed with a protrusion embedding groove (4), the protrusion embedding groove (4) is matched with the protrusion (12), and at least the thickness of the edge of the protrusion (12) is consistent with the depth of the protrusion embedding groove (4), the protrusion (12) is arranged in the protrusion embedding groove (4), and the weld (6) extends along the edge of the protrusion embedding groove (4).

7. The cooling device according to claim 6, characterized in that: The cooling medium joint (3) comprises a medium connecting portion (32) provided with the second interface (31) and a second bearing portion (33) connected to the medium connecting portion (32) and arranged in the placement groove (22); the protrusion (12) is stacked on a side of the second bearing portion (33) away from the bearing base (2); the protrusion embedding groove (4) comprises a first protrusion embedding groove (41) arranged on the medium connecting portion (32) and a second protrusion embedding groove (42) formed on a side of the second bearing portion (33) away from the bearing base (2) and connected to the first protrusion embedding groove (41); the second interface (31) is located at the bottom of the first protrusion embedding groove (41).

8. The cooling device according to claim 7, characterized in that: The placement groove (22) comprises: The first placement groove (221) has a depth direction consistent with the thickness direction of the protruding portion (12); a second placement groove (222) provided at the bottom of the first placement groove (221) and extending from the side of the first placement groove (221) toward the inside of the bearing base (2) along a second direction perpendicular to the first direction; and The second bearing portion (33) comprises a first portion (331) located in the first seating groove (221) and a second portion (332) located in the second seating groove (222); the bearing base (2) comprises a connecting portion (23) superimposed on the second portion (332); the protruding portion (12) is superimposed on the first portion (331) and butt-jointed with the connecting portion (23); and the weld (6) is formed at the intersection of the connecting portion (23), the protruding portion (12) and the second bearing portion (33).

9. The cooling device according to claim 8, characterized in that: The side edge of the connecting portion (23) adjacent to the protruding portion (12) forms an edge of the second protruding portion embedding groove (42).

10. The cooling device according to claim 7, characterized in that: The cooling medium joint (3) further comprises a protrusion (34) provided on the second bearing portion (33) and located at one end of the protruding portion (12) along a second direction, the protrusion (34) extending along the first direction, the second direction being perpendicular to the first direction, and the protrusion (34) forming an edge of the second protruding portion embedding groove (42).

11. The cooling device according to claim 4, characterized in that: The cooling plate body (11) and the first bearing portion (21) are welded, and the welding method of the cooling plate body (11) and the first bearing portion (21) is the same as the welding method of the protruding portion (12) and the cooling medium joint (3).

12. The cooling device according to claim 6, characterized in that: The supporting base (2) is also provided with a body embedding groove (24) adapted to the cooling plate body (11); the body embedding groove (24) is connected to the protruding portion embedding groove (4) to form an integral embedding groove adapted to the cooling plate (1); the cooling plate (1) and the supporting base (2) are connected together via a weld extending along the edge of the integral embedding groove.

13. A battery pack, characterized in that: A cooling device comprising the cooling device according to any one of claims 1 to 12.

14. An electrical device, characterized in that: Including the battery pack as claimed in claim 13.

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