Heat exchange plate, battery and electric device

Abstract

The embodiment of the utility model provides a heat exchange plate, a battery and an electric device, the heat exchange plate is used for carrying out heat exchange on a battery monomer, the heat exchange plate comprises a plate body, a communication joint and a welding flux, and the plate body is provided with a flow channel for accommodating a heat exchange medium and an opening communicated with the flow channel. The communicating connector is welded to the plate body and used for leading a heat exchange medium into or out of the flow channel, the communicating connector comprises a communicating hole, a first wall body and a second wall body, the first wall body and the second wall body surround the communicating hole, the communicating hole communicates with the flow channel, at least part of the first wall body extends into the opening, and the second wall body is located on the outer side of the plate body; at least part of the circumferential surface, facing the plate body, of the second wall body is spaced from the plate body, so that a containing groove surrounding the communicating hole is formed. The welding flux is contained in the containing groove, and the second wall body and the plate body are connected in a welded mode. The reliability of the heat exchange plate can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a heat exchange plate, a battery, and an electrical device. Background Art

[0002] Battery monomers are widely used in electronic devices, such as electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft, and electric tools, etc.

[0003] In batteries, heat exchange plates are usually used to regulate the temperature of battery cells. In the development of battery technology, how to improve the reliability of heat exchange plates is a research direction in battery technology. Utility Model Content

[0004] The present application provides a heat exchange plate, a battery and an electrical device, which can improve the reliability of the heat exchange plate.

[0005] The embodiment of the present application provides a heat exchange plate for exchanging heat for battery cells, including a plate body, a connecting joint and a solder. The plate body has a flow channel for accommodating a heat exchange medium and an opening connected to the flow channel. The connecting joint is welded to the plate body and is used to introduce or lead the heat exchange medium into or out of the flow channel. The connecting joint includes a connecting hole and a first wall body and a second wall body respectively surrounding the connecting hole. The connecting hole is connected to the flow channel. At least a portion of the first wall body extends into the opening. The second wall body is located on the outside of the plate body and protrudes from the outer periphery of the first wall body along the radial direction of the connecting hole. At least a portion of the circumferential surface of the second wall body facing the plate body is spaced from the plate body to form a receiving groove surrounding the connecting hole. The solder is received in the receiving groove, and the second wall body and the plate body are connected by welding.

[0006] In the above technical solution, the solder is placed in the receiving groove. Compared with the solder being arranged on the outer peripheral side of the connecting joint, the solder can be more fully infiltrated between the second wall and the plate body, thereby improving the welding strength and thus improving the reliability of the heat exchange plate.

[0007] In some embodiments, the entire circumferential surface of the second wall body facing the plate body is spaced apart from the plate body, and forms a receiving groove surrounding the through hole.

[0008] In the above technical solution, the receiving groove is set to be annular, so that the solder can fully infiltrate the entire circumference of the connecting joint, further improving the welding strength.

[0009] In some embodiments, the connecting joint also includes a third wall body, which surrounds the connecting hole and is located between the first wall body and the second wall body. The third wall body is located on the outside of the plate body and is against the plate body. The third wall body includes a first sub-segment protruding from at least part of the outer circumference of the first wall body along the radial direction of the connecting hole, and the second wall body protrudes from at least part of the first sub-segment along the radial direction of the connecting hole. The third wall body forms the bottom wall of the accommodating groove.

[0010] In the above technical solution, a third wall body is provided and is located between the first wall body and the second wall body and abuts against the plate body. In this way, the first sub-segment can form a barrier effect on the solder, reducing the volume of the solder that directly enters the flow channel from the gap between the first wall body and the plate body during the infiltration process, thereby reducing the impact of the solder on the flow channel and the heat exchange medium.

[0011] In some embodiments, the first sub-segment protrudes from the entire outer circumference of the first wall along the radial direction of the communicating hole.

[0012] In the above technical solution, in the circumferential direction of the connecting joint, the third wall body can form a blocking effect on a whole circle of solder, further reducing the volume of solder entering the flow channel from the gap between the first wall body and the plate body during the infiltration process, thereby reducing the impact of the solder on the flow channel and the heat exchange medium.

[0013] In some embodiments, the second wall protrudes out of the entire first subsegment along the radial direction of the communicating hole.

[0014] In the above technical solution, the formed receiving groove is annular, so the solder can fully infiltrate the entire circumference of the connecting joint, further improving the welding strength.

[0015] In some embodiments, a maximum dimension of the first wall along a first direction is greater than a maximum dimension of the third wall along the first direction, wherein the first direction is parallel to an axial direction of the communicating hole.

[0016] In the above technical solution, the deeper the first wall is inserted into the plate body, the less shaking of the connecting joint relative to the plate body can be, thereby improving the stability of the connection between the connecting joint and the plate body.

[0017] In some embodiments, the solder has a first state and a second state. In the first state, the solder is a welding wire and is clamped between the plate body and the second wall body; in the second state, the solder infiltrates the receiving groove and welds the plate body and the second wall body together.

[0018] In the above technical solution, the initial state of the solder is set to welding wire, and is clamped between the plate body and the second wall body. In this way, loading time is saved, and when automatic flame brazing or laser brazing is used to melt the welding wire, automated operation is achieved without manual welding, which saves time and improves welding efficiency.

[0019] In some embodiments, the entire circumferential surface of the second wall body facing the plate body is spaced apart from the plate body and forms a receiving groove surrounding the through hole. In the first state, the solder is an annular welding wire.

[0020] In the above technical solution, the annular welding wire can be placed in the receiving groove, which further saves the loading time. When the annular welding wire is melted by automatic flame brazing, laser brazing or brazing furnace, the automatic operation is realized without manual welding, which saves time and improves the welding efficiency.

[0021] In some embodiments, the maximum wall width of the annular welding wire is greater than or equal to the maximum depth of the receiving groove.

[0022] In the above technical solution, more solder can be contained in the receiving groove, thereby increasing the welding strength.

[0023] In some embodiments, the flow channel is blow-molded on the plate body.

[0024] In the above technical scheme, for the blow-formed plate body, since there is almost no welding process in the early stage, when welding the connecting joints, due to the consideration of production cost, the relevant technology will adopt manual wire filling and flame spray gun welding. Therefore, in this case, the method of setting a receiving groove to fill the annular welding wire can significantly improve the welding efficiency.

[0025] In some embodiments, the distance between the second wall and the plate body is H1, and H1 satisfies: 0.1 mm≤H1≤3.2 mm.

[0026] In the above technical solution, the spacing H1 between the second wall and the plate body is limited to greater than or equal to 0.1 mm, which can increase the axial size of the accommodating groove in the connecting hole, thereby increasing the volume of the solder and increasing the welding strength; the spacing H1 between the second wall and the plate body is limited to less than or equal to 3.2 mm to reduce the volume of the solder, save costs, and also reduce the difficulty of welding.

[0027] In some embodiments, H1 satisfies: 0.5 mm ≤ H1 ≤ 2.0 mm.

[0028] In the above technical solution, the spacing H1 between the second wall and the plate body is limited to be greater than or equal to 0.5 mm, which further increases the size of the receiving groove in the axial direction of the connecting hole, thereby increasing the volume of the solder, increasing the welding strength, and improving the tolerance of the welding, that is, it can accommodate the manufacturing tolerance of the connecting joint and the plate body. The spacing H1 between the second wall and the plate body is limited to be less than or equal to 2.0 mm to further reduce the volume of the solder and save costs.

[0029] In some embodiments, the number of the connecting joints is two, and both connecting joints are provided with a receiving groove.

[0030] In the above technical solution, accommodating grooves are provided on both connecting joints, which can improve the welding strength between the two connecting joints and the plate body, and further improve the reliability of the heat exchange plate.

[0031] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell and the above-mentioned heat exchange plate, wherein a heat exchange plate is provided on at least one side of the battery cell, and the heat exchange plate is used to exchange heat for the battery cell.

[0032] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application 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 the drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0035] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0036] Figure 3 A schematic diagram of the structure of a heat exchange plate provided in some embodiments of the present application;

[0037] Figure 4 for Figure 3 A magnified view at point A;

[0038] Figure 5 for Figure 3 Enlarged view at B;

[0039] Figure 6 A partial cross-sectional view of a heat exchange plate provided in some embodiments of the present application;

[0040] Figure 7 for Figure 6 Enlarged view at C.

[0041] The reference numerals of the specific embodiments are as follows:

[0042] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Battery cell; 6. Heat exchange plate; 7. Box; 71. First part; 72. Second part;

[0043] 61, plate body; 611, flow channel; 612, opening;

[0044] 62, connecting joint; 621, connecting hole; 622, first wall; 623, second wall; 624, third wall; 625, first subsection;

[0045] 63. Solder;

[0046] 64. Receiving tank;

[0047] X, first direction. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. 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] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0050] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0054] The term "plurality" used in the present application refers to two or more (including two).

[0055] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0057] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0058] In a battery, a heat exchange plate is usually arranged at the bottom of a battery cell to exchange heat for the battery cell, so as to reduce the risk of thermal runaway of the battery cell. The heat exchange medium in the heat exchange plate can increase or decrease the temperature of the battery cell.

[0059] The heat exchange plate has a connecting joint for introducing or leading the heat exchange medium into or out of the heat exchange plate. The connecting joint is connected to the rest of the heat exchange plate by welding. During welding, the heat exchange joint abuts against the outer surface of the rest of the heat exchange plate, and the solder melts on the outer peripheral surface of the connecting joint, thereby welding the connecting joint and the rest of the heat exchange plate. After welding, the cross section of the solder is roughly triangular.

[0060] In this welding method, the solder is located on the outer peripheral side of the connecting joint, connecting the connecting joint with the rest of the heat exchange plate. The wetting effect of the solder is poor, so the welding strength is not high.

[0061] In view of this, the present application provides a heat exchange plate, which forms a receiving groove between the second wall of the connecting joint and the plate body, and uses the receiving groove to accommodate solder. In this way, the solder located between the second wall and the plate body can be more fully infiltrated between the second wall and the plate body, thereby improving the connection strength between the two.

[0062] The heat exchange plate described in the embodiment of the present application is suitable for batteries and electrical devices using batteries.

[0063] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0064] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0065] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0066] like Figure 1 As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0067] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0068] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0069] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0070] like Figure 2 As shown, the battery 2 includes a battery cell 5 and a heat exchange plate 6 . The heat exchange plate 6 is disposed on at least one side of the battery cell 5 . The heat exchange plate 6 is used to exchange heat for the battery cell 5 .

[0071] The heat exchange plate 6 of the embodiment of the present application can be used to heat the battery cell 5, and can also be used to cool the battery cell 5. The heat exchange medium in the heat exchange plate 6 can be water or ethylene glycol.

[0072] The heat exchange plate 6 in the embodiment of the present application may be disposed on the bottom side of the battery cell 5 , or may be disposed on other sides, such as the top side.

[0073] The heat exchange plate 6 of the embodiment of the present application may be bonded to the battery cell 5 .

[0074] Optionally, the surface of the heat exchange plate 6 facing the battery cell 5 is a plane.

[0075] Exemplarily, the battery 2 further includes a box body 7 , which has a receiving space, and the battery cells 5 and the heat exchange plate 6 are located in the receiving space.

[0076] In the battery 2, the battery cell 5 can be one or more. If there are more than one battery cell 5, the battery cells 5 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 5 are both connected in series and in parallel. The battery cells 5 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 5 is fixed to the box 7; of course, the battery cells 5 can also be connected in series, in parallel or in mixed connection to form a battery module, and then the battery modules are connected in series, in parallel or in mixed connection to form a whole, and then fixed to the box 7.

[0077] The box body 7 includes a first part 71 and a second part 72, which cover each other, and the first part 71 and the second part 72 jointly define a storage space for accommodating the battery cell 5 and the heat exchange plate 6. The second part 72 can be a hollow structure with one end open, and the first part 71 can be a plate-like structure, and the first part 71 covers the open side of the second part 72, so that the first part 71 and the second part 72 jointly define a storage space; the first part 71 and the second part 72 can also be hollow structures with one side open, and the open side of the first part 71 covers the open side of the second part 72. Of course, the box body 7 formed by the first part 71 and the second part 72 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0078] Figure 3 A schematic diagram of the structure of a heat exchange plate provided in some embodiments of the present application; Figure 4 for Figure 3 A magnified view at point A; Figure 5 for Figure 3 Enlarged view at B.

[0079] like Figure 3-Figure 5As shown, the present application also provides a heat exchange plate 6 for exchanging heat for a battery cell 5, and the heat exchange plate 6 includes a plate body 61, a connecting joint 62 and a solder 63. The plate body 61 has a flow channel 611 for accommodating a heat exchange medium and an opening 612 connected to the flow channel 611; the connecting joint 62 is welded to the plate body 61 and is used to introduce or lead the heat exchange medium into or out of the flow channel 611, and the connecting joint 62 includes a connecting hole 621 and a first wall 622 and a second wall 623 surrounding the connecting hole 621 respectively, the connecting hole 621 is connected to the flow channel 611, at least part of the first wall 622 extends into the opening 612, the second wall 623 is located on the outside of the plate body 61, and protrudes from the outer periphery of the first wall 622 along the radial direction of the connecting hole 621, and at least part of the circumferential surface of the second wall 623 facing the plate body 61 is spaced from the plate body 61 to form a receiving groove 64 surrounding the connecting hole 621. The solder 63 is received in the receiving groove 64 , and the second wall 623 and the plate body 61 are connected by welding.

[0080] The connecting joint 62 in the embodiment of the present application can be a liquid inlet joint or a liquid outlet joint.

[0081] The flow channel 611 of the plate body 61 of the embodiment of the present application is used for the heat exchange medium to flow, and the two ends of the flow channel 611 are respectively connected to the liquid inlet joint and the liquid outlet joint. The flow channel 611 of the embodiment of the present application can be formed on the plate body 61 by stamping.

[0082] The first wall 622 and the second wall 623 of the embodiment of the present application are sequentially arranged along the axial direction of the connecting hole 621. The axial direction of the connecting hole 621 can also be approximately regarded as parallel to the inlet direction or outlet direction of the heat exchange medium. The cross-sectional shape of the connecting hole 621 in the axial direction can be circular, elliptical or square, etc., and the cross-sectional shapes in different parts can be the same or different.

[0083] The radial direction of the communicating hole 621 in the embodiment of the present application refers to a direction perpendicular to the axial direction of the communicating hole 621 .

[0084] The second wall body 623 of the embodiment of the present application protrudes from the outer periphery of the first wall body 622 along the radial direction of the connecting hole 621, that is, the second wall body 623 protrudes annularly from the first wall body 622, and the projection of the first wall body 622 on the second wall body 623 along the axial direction of the connecting hole 621 is located inside the second wall body 623 and does not overlap with the second wall body 623.

[0085] Optionally, the connecting hole 621 is circular in shape, the cross-sections of the second wall 623 and the first wall 622 are both annular and coaxially arranged, and the outer diameter of the second wall 623 is greater than the outer diameter of the first wall 622 .

[0086] In the embodiment of the present application, at least part of the circumferential surface of the second wall 623 facing the plate body 61 is spaced from the plate body 61, that is, the entire circumferential surface of the second wall 623 facing the plate body 61 may be spaced from the plate body 61, or part of the circumferential surface may be spaced from the plate body 61, and part of the circumferential surface may abut against the plate body 61. That is, the accommodating groove 64 of the present embodiment may be annular, surrounding the communicating hole 621, or may be semi-annular.

[0087] The solder 63 of the embodiment of the present application is placed in the receiving groove 64 when not soldered, and becomes liquid during soldering and gradually infiltrates between the plate body 61 and the second wall 623. Exemplarily, the solder 63 of the embodiment of the present application can be in a paste or powder state when not soldered, becomes liquid during soldering, and becomes a hard solid after soldering to connect the plate body 61 and the second wall 623.

[0088] Placing the solder 63 in the receiving groove 64 allows the solder 63 to more fully penetrate between the second wall 623 and the plate body 61 , thereby improving the welding strength and thus the reliability of the heat exchange plate, compared with the case where the solder 63 is arranged on the outer peripheral side of the connecting joint 62 .

[0089] In some embodiments, the entire circumferential surface of the second wall 623 facing the plate body 61 is spaced apart from the plate body 61 , and forms a receiving groove 64 surrounding the through hole.

[0090] The first wall 622 of the embodiment of the present application may be partially located inside the plate body 61 and partially located outside the plate body 61 , so that a distance exists between the second wall 623 and the plate body 61 .

[0091] The receiving groove 64 in the embodiment of the present application is annular in shape and surrounds the communicating hole 621 .

[0092] The receiving groove 64 is configured to be annular, so that the solder 63 can fully infiltrate the entire circumference of the connecting joint 62, further improving the welding strength.

[0093] Figure 6 A partial cross-sectional view of a heat exchange plate provided in some embodiments of the present application. Figure 7 for Figure 6 Enlarged view at C.

[0094] See also Figure 5-Figure 7In some embodiments, the connecting joint 62 also includes a third wall body 624, which surrounds the connecting hole 621 and is located between the first wall body 622 and the second wall body 623. The third wall body 624 is located on the outside of the plate body 61 and is against the plate body 61. The third wall body 624 includes a first sub-segment 625 protruding from at least part of the outer circumference of the first wall body 622 along the radial direction of the connecting hole 621, and the second wall body 623 protrudes from at least part of the first sub-segment 625 along the radial direction of the connecting hole 621. The third wall body 624 forms the bottom wall of the accommodating groove 64.

[0095] The first wall body 622 , the third wall body 624 , and the second wall body 623 of the embodiment of the present application are arranged in sequence along the axial direction of the communicating hole 621 .

[0096] The first sub-segment 625 of the embodiment of the present application protrudes from at least part of the outer circumference of the first wall body 622 along the radial direction of the connecting hole 621, that is, the first sub-segment 625 can protrude from the entire outer circumference of the first wall body 622 along the radial direction of the connecting hole 621, and at this time, the third wall body 624 only includes the first sub-segment 625; the first sub-segment 625 can also only protrude from part of the outer circumference of the first wall body 622 along the radial direction of the connecting hole 621, and the rest of the third wall body 624 except the first sub-segment 625 is flush with the first wall body 622 or concave inward.

[0097] The second wall body 623 of the embodiment of the present application protrudes from at least part of the first sub-segment 625 along the radial direction of the connecting hole 621, that is, the second wall body 623 can protrude from the entire first sub-segment 625 along the radial direction of the connecting hole 621, and the accommodating groove 64 formed at this time is annular; the second wall body 623 can also only protrude from part of the first sub-segment 625, and the other part of the second wall body 623 can be flush with the first sub-segment 625, and the accommodating groove 64 formed at this time is non-annular.

[0098] A third wall 624 is provided and is located between the first wall 622 and the second wall 623 and abuts against the plate body 61. In this way, the first sub-segment 625 can form a barrier effect on the solder 63, reducing the volume of the solder 63 that directly enters the flow channel 611 from the gap between the first wall 622 and the plate body 61 during the infiltration process, thereby reducing the impact of the solder 63 on the flow channel 611 and the heat exchange medium.

[0099] In some embodiments, the first sub-segment 625 protrudes from the entire outer circumference of the first wall 622 along the radial direction of the communicating hole 621 .

[0100] The first sub-segment 625 of the embodiment of the present application is convex on the first wall 622 .

[0101] In this way, on the circumference of the connecting joint 62, the third wall 624 can form a blocking effect on a whole circle of solder 63, further reducing the volume of solder 63 entering the flow channel 611 from the gap between the first wall 622 and the plate body 61 during the infiltration process, thereby reducing the impact of the solder 63 on the flow channel 611 and the heat exchange medium.

[0102] In some embodiments, the second wall 623 protrudes from the entire first subsection 625 along the radial direction of the communicating hole 621 .

[0103] In this way, the formed receiving groove 64 is annular, so the solder 63 can fully infiltrate the entire circumference of the connecting joint 62, further improving the welding strength.

[0104] In some embodiments, the maximum dimension of the first wall 622 along the first direction X is greater than the maximum dimension of the third wall 624 along the first direction X, wherein the first direction X is parallel to the axial direction of the connecting hole 621 .

[0105] The axial direction of the communicating hole 621 in the embodiment of the present application is the extending direction of the communicating hole 621 .

[0106] With such a configuration, the deeper the first wall 622 is inserted into the plate body 61 , the less shaking of the connecting joint 62 relative to the plate body 61 can be achieved, thereby improving the stability of the connection between the connecting joint 62 and the plate body 61 .

[0107] In some embodiments, the solder 63 has a first state and a second state. In the first state, the solder 63 is a welding wire and is clamped between the plate body 61 and the second wall body 623; in the second state, the solder 63 is soaked in the receiving groove 64 and welds the plate body 61 and the second wall body 623 together.

[0108] The initial state of the solder 63 is set to welding wire, and is clamped between the plate body 61 and the second wall body 623. In this way, loading time is saved, and when automatic flame brazing or laser brazing is used to melt the welding wire, automated operation is achieved without manual welding, which saves time and improves welding efficiency.

[0109] In some embodiments, the entire circumferential surface of the second wall 623 facing the plate body 61 is spaced apart from the plate body 61 and forms a receiving groove 64 surrounding the through hole. In the first state, the solder 63 is an annular welding wire.

[0110] The initial state of the solder 63 is set as a ring welding wire, and is sandwiched between the plate body 61 and the second wall 623. In this way, the ring welding wire can be sleeved in the receiving groove 64, further saving the material loading time. When the ring welding wire is melted by automatic flame brazing, laser brazing or brazing furnace, automatic operation is realized, and manual welding is not required, which saves time and improves welding efficiency.

[0111] In some embodiments, the maximum wall width of the annular welding wire is greater than or equal to the maximum depth of the receiving groove 64.

[0112] The wall width of the annular welding wire in the embodiment of the present application refers to the radial dimension of the wall of the annular welding wire along the connecting hole 621. The depth of the accommodating groove 64 refers to the radial dimension of the accommodating groove 64 along the connecting hole.

[0113] Such an arrangement can allow more solder to be contained in the receiving groove 64, thereby increasing the welding strength.

[0114] Optionally, the minimum wall width of the annular welding wire is greater than or equal to the maximum depth of the accommodating groove 64 .

[0115] In some embodiments, the flow channel 611 is blow-molded on the plate body 61 .

[0116] For the blow-formed plate body 61, since there is almost no welding process in the early stage, when welding the connecting joint 62, due to the consideration of production cost, the relevant technology will adopt manual wire filling and flame spray gun welding. Therefore, in this case, the method of providing a receiving groove 64 to fill the annular welding wire can significantly improve the welding efficiency.

[0117] Please continue reading Figure 7 In some embodiments, the distance between the second wall 623 and the plate body 61 is H1, and H1 satisfies: 0.1 mm≤H1≤3.2 mm.

[0118] By limiting the distance H1 between the second wall 623 and the plate body 61 to be greater than or equal to 0.1 mm, the axial size of the accommodating groove 64 in the connecting hole 621 can be increased, thereby increasing the volume of the solder 63 and increasing the welding strength; by limiting the distance H1 between the second wall 623 and the plate body 61 to be less than or equal to 3.2 mm, the volume of the solder 63 can be reduced, cost can be saved, and the welding difficulty can also be reduced.

[0119] In some embodiments, H1 satisfies: 0.5 mm ≤ H1 ≤ 2.0 mm.

[0120] By limiting the spacing H1 between the second wall 623 and the plate body 61 to be greater than or equal to 0.5 mm, the size of the receiving groove 64 in the axial direction of the connecting hole 621 is further increased, thereby increasing the volume of the solder 63, increasing the welding strength, and improving the tolerance of welding, that is, it can accommodate the manufacturing tolerance of the connecting joint 62 and the plate body 61. By limiting the spacing H1 between the second wall 623 and the plate body 61 to be less than or equal to 2.0 mm, the volume of the solder 63 can be further reduced, saving costs.

[0121] In some embodiments, there are two connecting joints 62 , and both connecting joints 62 are provided with a receiving groove 64 .

[0122] By providing the receiving grooves 64 on the two connecting joints 62 , the welding strength between the two connecting joints 62 and the plate body 61 can be improved, and the reliability of the heat exchange plate can be further improved.

[0123] See also Figure 2-Figure 7The embodiment of the present application provides a heat exchange plate 6 for exchanging heat for a battery cell 5. The heat exchange plate 6 includes a plate body 61, a connecting joint 62, and a solder 63. The plate body 61 has a flow channel 611 for accommodating a heat exchange medium and an opening 612 connected to the flow channel 611; the connecting joint 62 is welded to the plate body 61 and is used to introduce or lead the heat exchange medium into or out of the flow channel 611. The connecting joint 62 includes a connecting hole 621 and a first wall 622 and a second wall 623 surrounding the connecting hole 621 respectively. The connecting hole 621 is connected to the flow channel 611. At least a portion of the first wall 622 extends into the opening 612. The second wall 623 is located on the outer side of the plate body 61 and protrudes from the outer periphery of the first wall 622 along the radial direction of the connecting hole 621. At least a portion of the circumferential surface of the second wall 623 facing the plate body 61 is spaced from the plate body 61 to form a receiving groove 64 surrounding the connecting hole 621. The solder 63 is contained in the containing groove 64, and the second wall 623 and the plate body 61 are connected by welding. The entire circumferential surface of the second wall 623 facing the plate body 61 is spaced from the plate body 61, and forms a containing groove 64 surrounding the through hole. The connecting joint 62 also includes a third wall 624, which surrounds the connecting hole 621 and is located between the first wall 622 and the second wall 623. The third wall 624 is located outside the plate body 61 and abuts against the plate body 61. The third wall 624 includes a first sub-segment 625 protruding from the entire outer circumference of the first wall 622 along the radial direction of the connecting hole 621, and the second wall 623 protrudes from the entire first sub-segment 625 along the radial direction of the connecting hole 621. The third wall 624 forms the bottom wall of the containing groove 64. The solder 63 has a first state and a second state. In the first state, the solder 63 is a ring-shaped solder wire and is sandwiched between the plate body 61 and the second wall body 623. In the second state, the solder 63 soaks in the receiving groove 64 and welds the plate body 61 and the second wall body 623 together. The flow channel 611 is blown and formed on the plate body 61. There are two connecting joints 62, and both connecting joints 62 are provided with a receiving groove 64.

[0124] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat exchange plate for exchanging heat for a battery cell, characterized in that: include: A plate body having a flow channel for accommodating a heat exchange medium and an opening communicating with the flow channel; A connecting joint, the connecting joint is welded to the plate body and used to introduce or lead the heat exchange medium into or out of the flow channel, the connecting joint comprises a connecting hole and a first wall body and a second wall body respectively surrounding the connecting hole, the connecting hole is connected to the flow channel, at least a portion of the first wall body extends into the opening, the second wall body is located outside the plate body and protrudes from the outer periphery of the first wall body along the radial direction of the connecting hole, and at least a portion of the circumferential surface of the second wall body facing the plate body is spaced from the plate body to form a receiving groove surrounding the connecting hole; Solder is contained in the containing groove and connects the second wall body and the plate body by welding.

2. The heat exchange plate according to claim 1, characterized in that: The entire circumferential surface of the second wall body facing the plate body is spaced apart from the plate body and forms a receiving groove surrounding the through hole.

3. The heat exchange plate according to claim 1, characterized in that: The connecting joint further includes a third wall body, the third wall body surrounds the connecting hole and is located between the first wall body and the second wall body, the third wall body is located outside the plate body and abuts against the plate body, The third wall body includes a first subsection protruding from at least part of the outer circumference of the first wall body in the radial direction of the connecting hole, the second wall body protrudes from at least part of the first subsection in the radial direction of the connecting hole, and the third wall body forms the bottom wall of the accommodating groove.

4. The heat exchange plate according to claim 3, characterized in that: The first sub-segment protrudes from the entire outer circumference of the first wall body along the radial direction of the communicating hole.

5. The heat exchange plate according to claim 3, characterized in that: The second wall body protrudes out of the entire first sub-segment along the radial direction of the communicating hole.

6. The heat exchange plate according to claim 3, characterized in that: The maximum dimension of the first wall along a first direction is greater than the maximum dimension of the third wall along the first direction, wherein the first direction is parallel to the axial direction of the communicating hole.

7. The heat exchange plate according to claim 1, characterized in that: The solder has a first state and a second state. In the first state, the solder is a welding wire and is clamped between the plate body and the second wall body; in the second state, the solder infiltrates the receiving groove and welds the plate body and the second wall body together.

8. The heat exchange plate according to claim 7, characterized in that: The entire circumferential surface of the second wall body facing the plate body is spaced apart from the plate body and forms a receiving groove surrounding the through hole. In the first state, the solder is a ring-shaped solder wire.

9. The heat exchange plate according to claim 8, characterized in that: The maximum wall width of the annular welding wire is greater than or equal to the maximum depth of the accommodating groove.

10. The heat exchange plate according to claim 8, characterized in that: The flow channel is blow-formed on the plate body.

11. The heat exchange plate according to claim 1, characterized in that: The distance between the second wall and the plate body is H1, and H1 satisfies: 0.1mm≤H1≤3.2mm.

12. The heat exchange plate according to claim 11, characterized in that: The H1 satisfies: 0.5mm≤H1≤2.0mm.

13. The heat exchange plate according to claim 1, characterized in that: The number of the connecting joints is two, and both of the two connecting joints are provided with the accommodating groove.

14. A battery, characterized in that: include: Battery cells; The heat exchange plate of the battery according to any one of claims 1 to 13, wherein the heat exchange plate is provided on at least one side of the battery cell, and the heat exchange plate is used to exchange heat for the battery cell.

15. An electrical device, characterized in that: Comprising a battery as claimed in claim 14, the battery is used to provide electrical energy.

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