Battery pack and electric device

Abstract

The application relates to a battery pack and an electric device. The battery pack comprises a battery box, a connector and a cooling plate. The battery box comprises a box frame and a protection plate. The box frame has a receiving cavity and a first opening. The protection plate has a protection plate body and a first protruding part protruding from the protection plate body. The protection plate body covers the first opening, and the first protruding part extends to the outside of the box frame. The connector is arranged on the outside of the box frame and corresponds to the position of the first protruding part. The side of the connector facing the first protruding part has a first interface. The cooling plate comprises a cooling plate body and a second protruding part protruding from the cooling plate body. The second protruding part has a second interface communicating with a flow channel. The cooling plate body is arranged in the receiving cavity of the box frame. The second protruding part extends to the outside of the box frame and corresponds to the position of the first protruding part and is located between the first protruding part and the connector. The first protruding part is fixedly connected with the connector, and the second interface is connected with the first interface.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Temperature has a significant impact on battery performance; batteries are prone to overheating and overcooling during use, which can affect battery performance, lifespan, and even safety.

[0003] In related technologies, the battery pack contains a cooling plate for cooling the individual battery cells. The cooling plate has a cooling medium flow path and a cooling medium connector connected to it. This connector allows external cooling medium to flow into the cooling plate or vice versa. This connector connects to pipelines and carries a significant risk of leakage. Leakage can easily cause short circuits in the individual battery cells, severely compromising the safety of the battery pack. Utility Model Content

[0004] Therefore, it is necessary to provide a battery pack and power device that can improve safety in response to the above problems.

[0005] To achieve the above objectives, in a first aspect, the following technical solution is provided: a battery pack, comprising:

[0006] A battery box includes a box frame and a protective plate. The box frame has a receiving cavity and a first opening communicating with the receiving cavity. The protective plate has a protective plate body and a first protrusion protruding from the protective plate body. The protective plate body covers the first opening, and the first protrusion extends to the outside of the box frame.

[0007] A connector is disposed on the outer side of the housing frame and corresponds to the position of the first protrusion, and has a first interface on the side facing the first protrusion; and

[0008] A cooling plate includes a cooling plate body having a flow channel for the flow of a cooling medium and a second protrusion protruding from the cooling plate body. The second protrusion has a second interface communicating with the flow channel. The cooling plate body is disposed within the receiving cavity of the housing frame. The second protrusion extends to the outside of the housing frame and corresponds to the position of the first protrusion, and is located between the first protrusion and the connector. The first protrusion is fixedly connected to the connector, and the second interface is mated with the first interface.

[0009] In some embodiments, the side surface of the connector facing the first protrusion has a first region and a second region, and the first region is located between the second region and the frame of the housing;

[0010] The surface of the first region is recessed to form a first groove, the second protrusion is located in the first groove and does not exceed the recess depth of the first groove, and the connector and the first protrusion are locked and fixed at the second region by a first locking member.

[0011] In some embodiments, the side surface of the first protrusion facing away from the connector is a first outer surface, and a first convex bump is formed on the first outer surface; the protrusion height of the first convex bump relative to the first outer surface is greater than the protrusion height of the first locking member relative to the first outer surface.

[0012] In some embodiments, the second protrusion is connected to the connector by a first solder mark extending along the surface of the second protrusion, the first solder mark being a brazing solder mark.

[0013] In some embodiments, the connector further has an inlet channel and a drain channel, both of which penetrate the first region and form a first inlet interface and a first drain interface in the first region, respectively serving as the first interface; the second interface includes a second inlet interface and a second drain interface, wherein the first inlet interface is connected to the second inlet interface, and the first drain interface is connected to the second drain interface.

[0014] The connector also has a water inlet and a water outlet on the side opposite to the frame of the housing. The water inlet is connected to the water inlet channel, and the water outlet is connected to the water outlet channel.

[0015] The first water inlet, the water inlet channel, and the second water inlet are each configured to have at least two connections. Each first water inlet is connected to each water inlet channel in a one-to-one correspondence, and each first water inlet is connected to each second water inlet in a one-to-one correspondence. The water inlet is connected to any one of the water inlet channels. The connector also has a connecting channel that extends through opposite sides of the connector in a preset direction, and both ends of the connecting channel are sealed with plugs. The end of each water inlet channel opposite to the first water inlet is connected to the connecting channel.

[0016] In some embodiments, the connector is connected to the housing frame via a second weld mark extending along the edge of the connector, the second weld mark being an arc weld mark.

[0017] In some embodiments, the battery pack further includes a sealing ring, the sealing ring including a sealing ring body and a third protrusion protruding from the sealing ring body, the sealing ring body being located between the protective plate body and the housing frame, and the third protrusion being located between the first protrusion and the connector and the second protrusion.

[0018] In some embodiments, the side of the housing frame facing the protective plate has a first flange, the first flange extending along the peripheral edge of the housing frame, and the protective plate body is locked and fixed to the first flange by a second locking member;

[0019] The side of the box frame facing the protective plate has a second groove that passes through the first flange, and the second protrusion extends through the second groove to the outside of the box frame.

[0020] In some embodiments, the two ends of the first flange facing the second groove are connected to the portion of the second protrusion located within the second groove by a third weld mark, which is an arc weld mark.

[0021] To achieve the above objectives, the second aspect provides the following technical solution:

[0022] An electrical device includes a battery pack as described in the first aspect above.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] The aforementioned battery pack and electrical device have a connector connected to an external pipeline. The cooling medium in the external pipeline passes sequentially through the connector and the second protrusion of the cooling plate into the flow channel of the cooling plate body, enabling the cooling plate body to cool the battery module. The cooling medium in the flow channel of the cooling plate body then passes sequentially through the second protrusion of the cooling plate and the connector back to the external pipeline, thus achieving a circulating flow of the cooling medium within the flow channel of the cooling plate body. Furthermore, the second protrusion and the connector are assembled on the outside of the casing frame via the first protrusion of the protective plate, thereby placing the connector outside the casing frame and avoiding the risk of leakage inside the casing frame, significantly improving the safety of the battery pack. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the battery pack structure in one embodiment of this application;

[0026] Figure 2 for Figure 1 A top view of the battery pack shown;

[0027] Figure 3 for Figure 1 The battery pack shown is a bottom view.

[0028] Figure 4 for Figure 3 A magnified view of a portion of the battery pack at the first protrusion of the protective plate;

[0029] Figure 5 for Figure 1 The battery pack shown is a bottom view (protective plate omitted);

[0030] Figure 6 for Figure 1 The battery pack shown is a bottom view (protective plate and sealing ring omitted);

[0031] Figure 7 for Figure 1 The battery pack shown is a bottom view (protective plate, sealing ring and cooling plate omitted);

[0032] Figure 8 for Figure 7 A magnified view of a portion of the battery pack at the connector shown;

[0033] Figure 9 This is a magnified view (front view) of the battery pack shown in Figure 1 at the connector.

[0034] Figure 10 A schematic diagram of the connector structure of the battery pack shown in Figure 9;

[0035] Figure 11 for Figure 10 The front view of the connector shown;

[0036] Figure 12 for Figure 11 The connector shown is a cross-sectional view along the AA direction. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] One embodiment of this application provides an electrical device that utilizes a battery pack as its power source. Specifically, the electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical device.

[0044] The specific structure of the battery pack is described below with reference to the accompanying drawings. Please refer to the attached diagram. Figures 1 to 9 As shown, the battery pack includes a battery box, connector 20, cooling plate 30, and battery module 70 (see Figure 1). Figure 7The battery box includes a box frame 11 and a protective plate 13. The box frame 11 has a receiving cavity and a first opening communicating with the receiving cavity. The battery module 70 is received in the receiving cavity of the box frame 11. The protective plate 13 has a protective plate body 131 and a first protrusion 133 protruding from the protective plate body 131. The protective plate body 131 of the protective plate 13 covers the first opening of the box frame 11, and the first protrusion 133 of the protective plate 13 extends to the outside of the box frame 11. A connector 20 is provided on the outside of the box frame 11 and corresponds to the position of the first protrusion 133 of the protective plate 13. The connector 20 has a first interface b1 on the side facing the first protrusion 133. The cooling plate 30 includes a cooling plate body 31 and a second protrusion 33 protruding from the cooling plate body 31. The cooling plate body 31 of the cooling plate 30 has a flow channel for the flow of cooling medium, and the second protrusion 33 of the cooling plate 30 has a second interface e1 communicating with the flow channel. The cooling plate body 31 of the cooling plate 30 is disposed within the receiving cavity of the housing frame 11, thereby cooling the battery module 70 within the receiving cavity. The second protrusion 33 of the cooling plate 30 extends to the outer side of the housing frame 11 and corresponds to the position of the first protrusion 133. The second protrusion 33 of the cooling plate 30 is located between the first protrusion 133 of the protective plate 13 and the connector 20. The first protrusion 133 of the protective plate 13 is fixedly connected to the connector 20, and the second interface e1 on the second protrusion 33 is mated with and communicates with the first interface b1 on the connector 20.

[0045] Thus, connector 20 is connected to an external pipeline, and the cooling medium in the external pipeline passes sequentially through connector 20 and the second protrusion 33 of cooling plate 30 into the flow channel of cooling plate body 31, enabling cooling plate body 31 to cool battery module 70. The cooling medium in the flow channel of cooling plate body 31 then passes sequentially through the second protrusion 33 of cooling plate 30 and connector 20 to be discharged to the external pipeline, thereby realizing the circulation of cooling medium in the flow channel of cooling plate body 31. Furthermore, the second protrusion 33 and connector 20 are assembled on the outside of the housing frame 11 through the first protrusion 133 of protective plate 13, thereby achieving the purpose of placing connector 20 outside the housing frame 11, avoiding the risk of leakage inside the housing frame 11, and improving the convenience of maintenance and replacement of the cooling system without disassembling the battery box, reducing maintenance costs. At the same time, it also facilitates the sealed connection between the first protrusion 133 of protective plate 13 and connector 20, greatly improving the reliability and safety of the battery pack.

[0046] It should be noted that by designing the protective plate 13 to include a protective plate body 131 and a first protrusion 133, the protective plate body 131 protects the cooling plate body 31 of the cooling plate 30, and the first protrusion 133 protects the second protrusion 33 of the cooling plate 30. This also improves the connection strength between the joint 20 and the second protrusion 33 of the cooling plate 30, further enhancing the sealing performance and structural robustness.

[0047] In a specific embodiment, the side of the housing frame 11 facing away from the protective plate 13 also has a second opening communicating with the receiving cavity, so that the battery module 70 can be received in the receiving cavity of the housing frame 11. The battery box also includes a cover plate 15 (see... Figure 1 or Figure 2 The cover plate 15 is placed over the second opening of the box frame 11 to close the second opening of the box frame 11. Thus, the box frame 11 has a first opening and a second opening arranged opposite each other on both sides along its thickness direction. The first opening of the box frame 11 is closed by the protective plate body 131, and the second opening of the box frame 11 is closed by the cover plate 15, which simplifies the structure and improves installation efficiency.

[0048] Please see Figures 7 to 11 In the embodiments of this application, the surface of the connector 20 facing the first protrusion 133 has a first region 21 and a second region 23, and the first region 21 is located between the second region 23 and the housing frame 11, that is, the first region 21 is located on the side of the second region 23 facing the housing frame 11. The surface of the first region 21 is recessed to form a first groove 211, and the second protrusion 33 of the cooling plate 30 is located in the first groove 211. The connector 20 and the first protrusion 133 of the protective plate 13 are locked and fixed at the second region 23 by a first locking member 40. Thus, on the one hand, the first groove 211 accommodates the second protrusion 33 of the cooling plate 30, preventing damage to the second protrusion 33 of the cooling plate 30 when the protective plate 13 is locked onto the connector 20; on the other hand, the second protrusion 33 of the cooling plate 30 is located between the connector 20 and the first protrusion 133 of the protective plate 13, ensuring protection and reinforcement of the second protrusion 33 of the cooling plate 30; simultaneously, the first locking member 40 can be concentrated in the second area 23, forming a "zoned stress" design with the first groove 211, ensuring connection strength while avoiding seal failure caused by stress concentration. Optionally, the first locking member 40 can be a screw.

[0049] Furthermore, the thickness of the second protrusion 33 of the cooling plate 30 does not exceed the recess depth of the first groove 211, thereby preventing the first protrusion 133 of the protective plate 13 from crushing the second protrusion 33 of the cooling plate 30. Preferably, the thickness of the second protrusion 33 of the cooling plate 30 is equal to the depth of the first groove 211, so that the side surface of the second protrusion 33 of the cooling plate 30 facing the first protrusion 133 is flush with the second region 23 of the connector 20. This ensures that when the first protrusion 133 of the protective plate 13 is locked and fixed to the connector 20, the first protrusion 133 of the protective plate 13 fits tightly against the second region 23 of the connector 20 and the side surface of the first protrusion 133 facing the second protrusion 33, further improving the sealing effect and firmness.

[0050] Furthermore, the surface of the first protrusion 133 facing away from the connector 20 is the first outer surface 1330 (see...). Figure 4 The first outer surface 1330 has a first protrusion 1331 formed thereon (see...). Figure 4 The first protrusion 1331 protrudes higher than the first outer surface 1330, meaning the first protrusion 1331 is higher than the first locking member 40. Thus, when the side of the battery pack with the protective plate 13 is impacted, the first protrusion 1331, being higher than the first locking member 40, forms a physical barrier, protecting the first locking member 40 and preventing or mitigating the impact. This significantly reduces the risk of connection and sealing failure between the first protrusion 133 of the protective plate 13 and the connector 20 due to damage to the first locking member 40. Optionally, the first protrusion 1331 can be formed using a stamping process, eliminating the need for additional parts and achieving both lightweight and cost-effectiveness.

[0051] Furthermore, there are multiple first locking members 40, which are spaced apart along the edge of the first protrusion 133 of the protective plate 13. There are also multiple first protrusions 1331, with a first protrusion 1331 provided between each pair of adjacent first locking members 40. That is to say, the first locking members 40 and the first protrusions 1331 are arranged alternately, which further improves the protective performance and the firmness of the connection.

[0052] Furthermore, the first protrusion 1331 and the edge of the first protrusion 133 of the protective plate 13 have a first preset distance, so that when the first protrusion 133 is locked and fixed with the connector 20, the concave side of the first protrusion 1331 is closed by the connector 20, preventing external mud and sand from entering the first protrusion 1331.

[0053] In a specific embodiment, the second protrusion 33 of the cooling plate 30 is connected to the connector 20 by a first solder mark c1 extending along the surface of the second protrusion 33 (see...). Figure 10The first solder mark c1 is a brazing solder mark. That is, brazing is performed between the second protrusion 33 of the cooling plate 30 and the connector 20. This serves two purposes: firstly, it securely connects the second protrusion 33 of the cooling plate 30 and the connector 20, improving connection strength; secondly, it seals the connection between the second protrusion 33 of the cooling plate 30 and the connector 20, improving sealing performance and further reducing the risk of leakage, making it particularly suitable for high-pressure cooling systems. Furthermore, brazing can evenly fill the interface gap, reducing contact thermal resistance and improving cooling efficiency.

[0054] In a specific embodiment, the connector 20 and the outer surface of the housing frame 11 are connected by a second solder mark c2 extending along the edge of the connector 20 (see...). Figure 10 The second weld mark c2 is an arc weld mark. That is, arc welding is performed between the joint 20 and the outer surface of the housing frame 11. On the one hand, it achieves a fixed connection between the joint 20 and the housing frame 11, avoiding the phenomenon that the weight of the joint 20 presses on the second protrusion 33 of the cooling plate 30 and causes the second protrusion 33 to deform, thus extending the life of the cooling plate; on the other hand, it achieves a seal between the joint 20 and the housing frame 11, eliminating the risk of crevice corrosion.

[0055] Please see Figure 5 and Figure 9 Specifically, in this embodiment, the battery pack further includes a sealing ring 60, which comprises a sealing ring body 61 and a third protrusion 63 protruding from the sealing ring body 61. The sealing ring body 61 is located between the protective plate body 131 and the housing frame 11, and the third protrusion 63 is located between the first protrusion 133 of the protective plate 13 and the second protrusion 33 of the connector 20 and the cooling plate 30. Thus, the sealing ring body 61 seals the gap between the protective plate body 131 and the housing frame 11, and the third protrusion 63 seals the gap between the first protrusion 133 of the protective plate 13, the second protrusion 33 of the cooling plate 30, and the second region 23 of the connector 20, further improving the sealing performance of the battery pack. Simultaneously, the sealing ring 60 is elastic, and its elastic deformation can absorb component tolerances, reducing the requirements for machining precision.

[0056] Please see Figures 4 to 8 Specifically, in this embodiment, the side of the housing frame 11 facing the protective plate body 131 has a first flange 110 (see...). Figure 6 The first flange 110 extends along the peripheral edge of the housing frame 11. The protective plate body 131 is secured by a second locking member 50 (see...). Figure 4 The housing frame 11 has a second groove 115 that passes through the first flange 110 on the side facing the protective plate 13 (see...). Figure 8The second groove 115 connects the receiving cavity of the housing frame 11 and the outer side of the housing frame 11. The second protrusion 33 of the cooling plate 30 extends to the outer side of the housing frame 11 through the second groove 115. The second groove 115 provides a pre-position for the cooling plate 30, eliminating the need for precise hole alignment of the second locking member 50, thus shortening assembly time and improving installation efficiency. In this way, the protective plate body 131 is locked and fixed to the first flange 110 by the second locking member 50, realizing the assembly of the protective plate 13 and the housing frame 11. The second groove 115 allows the second protrusion 33 of the cooling plate 30 to extend to the outer side of the housing frame 11. Optionally, the second locking member 50 is a screw.

[0057] Furthermore, the sealing ring body 61 of the sealing ring 60 is located between the first flange 110 and the protective plate body 131, thereby using the sealing ring body 61 to seal the gap between the protective plate body 131 and the first flange 110.

[0058] Specifically, in this embodiment, the surface of the protective plate body 131 facing away from the first flange 110 is the second outer surface 1310. A second protrusion 1311 is formed on this second outer surface 1310. The protrusion height of the second protrusion 1311 relative to the second outer surface 1310 is greater than the protrusion height of the second locking member 50 relative to the second outer surface 1310. Thus, when the side of the battery pack with the protective plate 13 is impacted, because the second protrusion 1311 is higher than the second locking member 50, it can protect the second locking member 50, avoiding or reducing the impact on the second locking member 50, and greatly reducing the risk of connection and sealing failure between the protective plate body 131 and the first flange 110 due to damage to the second locking member 50. Optionally, the second protrusion 1311 can be formed by a stamping process.

[0059] Furthermore, there are multiple second locking members 50, which are spaced apart along the periphery of the protective plate body 131. There are also multiple second protrusions 1311, with one protrusion 1311 positioned between each pair of adjacent second locking members 50. In other words, the second locking members 50 and the second protrusions 1311 are arranged alternately, further enhancing the protective performance and the strength of the connection.

[0060] Furthermore, the second protrusion 1311 and the edge of the protective plate body 131 of the protective plate 13 have a second preset distance, so that when the protective plate body 131 is locked and fixed with the first flange 110, the concave side of the second protrusion 1311 is closed by the first flange 110, preventing external mud and sand from entering the second protrusion 1311.

[0061] In a specific embodiment, the two ends of the first flange 110 facing the second groove 115 and the portion of the second protrusion 33 of the cooling plate 30 located within the second groove 115 are connected by a third solder mark c3 (see...). Figure 6 The third weld mark c3 is an arc weld mark. That is, arc welding is performed between the two ends of the first flange 110 facing the second groove 115 and the second protrusion 33 of the cooling plate 30, which achieves the seal between the second protrusion 33 of the cooling plate 30 and the frame 11 of the housing, further improving the sealing performance of the battery pack.

[0062] It should be noted that, since the thickness of the two ends of the first flange 110 facing the second groove 115 is relatively thin, it cannot meet the requirement of a wall thickness greater than 5mm for friction stir welding. Therefore, arc welding is performed between the two ends of the first flange 110 facing the second groove 115 and the second protrusion 33 of the cooling plate 30 to ensure welding quality and improve sealing performance. At the same time, the weld mark c3 is located at the end of the second groove 115, which disperses the vibration stress of the cooling plate 30 to the frame 11 of the housing, reducing fatigue cracking of the weld.

[0063] Furthermore, a second flange 113 is provided on the inner side wall of the housing frame 11 (see...). Figure 7 The second flange 113 extends along the peripheral edge of the housing frame 11. The cooling plate body 31 of the cooling plate 30 is connected to the second flange 113 by a fourth weld mark c4 (see...). Figure 6 The fourth weld mark c4 is a friction stir weld mark. That is to say, a friction stir weld is performed between the cooling plate body 31 of the cooling plate 30 and the second flange 113. On the one hand, it realizes the fixed connection between the cooling plate body 31 of the cooling plate 30 and the second flange 113 of the housing frame 11; on the other hand, it also realizes the sealing between the cooling plate body 31 of the cooling plate 30 and the second flange 113 of the housing frame 11, which is conducive to further improving the sealing performance of the battery pack.

[0064] Please see Figures 8 to 12 In embodiments of this application, the connector 20 further includes an inlet channel d1 and a drain channel d3. Both the inlet channel d1 and the drain channel d3 penetrate the first region 21 of the connector 20, and respectively form a first inlet interface b11 and a first drain interface b12 in the first region 21 of the connector 20, serving as the aforementioned first interface b1. The second interface e1 (see...) Figure 2 This includes the second water inlet port e11 (see...) Figure 2 ) and second drainage interface e12 (see Figure 2The first water inlet port b11 and the second water inlet port e11 are connected to each other, and the first drain port b12 and the second drain port e12 are connected to each other. The connector 20 also has a water inlet a1 and a drain port a2 on the side opposite to the housing frame 11. The water inlet a1 is connected to the water inlet channel d1, and the drain port a2 is connected to the drain channel d3. Thus, the connector 20 is connected to an external water inlet pipe through the water inlet a1, and to an external drain pipe through the drain port a2. The cooling medium supplied by the external water inlet pipe enters the water inlet channel d1 within the connector 20 through the water inlet a1. The cooling medium in the water inlet channel d1 then sequentially passes through the first water inlet port b11 and the second water inlet port e11 into the flow channel of the cooling plate body 31, thereby enabling the cooling plate body 31 to cool the battery module 70. The cooling medium in the flow channel of the cooling plate body 31 enters the drain flow channel d3 of the connector 20 through the second drain port e12 and the first drain port b12 in sequence, and then enters the external drain pipe through the drain port a2, thereby realizing the circulation of the cooling medium in the flow channel of the cooling plate body 31.

[0065] Furthermore, at least two of each of the first water inlet port b11, the first water inlet channel d1, and the second water inlet port e11 are provided. Each first water inlet port b11 is connected to each water inlet channel d1 in a one-to-one correspondence. Each first water inlet port b11 is connected to each second water inlet port e11 in a one-to-one correspondence, and the water inlet a1 is connected to any one of the water inlet channels d1.

[0066] The connector 20 also has a connecting channel d2, which extends through opposite sides of the connector 20 in a preset direction. Both ends of the connecting channel d2 are sealed by plugs 215 to prevent leakage of cooling medium within the connecting channel d2. Each water inlet channel d1 has its end opposite to the first water inlet port b11 connected to the connecting channel d2. In this way, by connecting the various water inlet channels d1 through the connecting channel d2, it is ensured that after the cooling medium transported by the external water inlet pipe enters one of the water inlet channels d1 through the water inlet a1, a portion of the cooling medium enters a portion of the flow channel inside the cooling plate body 31 through the water inlet channel d1; another portion of the cooling medium enters the connecting channel d2 through the water inlet channel d1, and then enters another portion of the flow channel inside the cooling plate body 31 through the connecting channel d2. In other words, setting multiple water inlet channels d1 to correspond to the flow channels in different areas on the cooling plate body 31 is beneficial to improving the cooling efficiency of the cooling plate body 31 for the battery module 70, and can also improve the temperature uniformity of the battery module 70.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The battery box includes a box frame (11) and a protective plate (13). The box frame (11) has a receiving cavity and a first opening communicating with the receiving cavity. The protective plate (13) has a protective plate body (131) and a first protrusion (133) protruding from the protective plate body (131). The protective plate body (131) covers the first opening, and the first protrusion (133) extends to the outside of the box frame (11). A connector (20) is disposed on the outer side of the housing frame (11) and corresponds to the position of the first protrusion (133), and has a first interface (b1) on the side facing the first protrusion (133); and The cooling plate (30) includes a cooling plate body (31) having a flow channel for the flow of cooling medium and a second protrusion (33) protruding from the cooling plate body (31). The second protrusion (33) has a second interface (e1) communicating with the flow channel. The cooling plate body (31) is disposed in the receiving cavity of the housing frame (11). The second protrusion (33) extends to the outside of the housing frame (11) and corresponds to the position of the first protrusion (133), and is located between the first protrusion (133) and the connector (20). The first protrusion (133) is fixedly connected to the connector (20), and the second interface (e1) is connected to the first interface (b1).

2. The battery pack according to claim 1, characterized in that, The connector (20) has a first region (21) and a second region (23) on the side surface facing the first protrusion (133), and the first region (21) is located between the second region (23) and the box frame (11); The surface of the first region (21) is recessed to form a first groove (211), the second protrusion (33) is located in the first groove (211) and does not exceed the recess depth of the first groove (211), and the connector (20) and the first protrusion (133) are locked and fixed at the second region (23) by a first locking member (40).

3. The battery pack according to claim 2, characterized in that, The side surface of the first protrusion (133) facing away from the connector (20) is the first outer surface (1330), and a first protrusion (1331) is formed on the first outer surface (1330); the protrusion height of the first protrusion (1331) relative to the first outer surface (1330) is greater than the protrusion height of the first locking member (40) relative to the first outer surface (1330).

4. The battery pack according to claim 2, characterized in that, The second protrusion (33) is connected to the connector (20) by a first solder mark (c1) extending along the surface of the second protrusion (33), the first solder mark (c1) being a brazing solder mark.

5. The battery pack according to claim 2, characterized in that, The connector (20) also has an inlet channel (d1) and a drain channel (d3), both of which penetrate the first region (21) and form a first inlet interface (b11) and a first drain interface (b12) as the first interface (b1) in the first region (21); the second interface (e1) includes a second inlet interface (e11) and a second drain interface (e12), the first inlet interface (b11) and the second inlet interface (e11) are connected, and the first drain interface (b12) and the second drain interface (e12) are connected; The connector (20) also has a water inlet (a1) and a drain outlet (a2) on the side away from the box frame (11). The water inlet (a1) is connected to the water inlet channel (d1), and the drain outlet (a2) is connected to the drain channel (d3). The first water inlet (b11), the water inlet channel (d1), and the second water inlet (e11) are each configured to be at least two. Each first water inlet (b11) is connected to each water inlet channel (d1) in a one-to-one correspondence. Each first water inlet (b11) is connected to each second water inlet (e11) in a one-to-one correspondence. The water inlet (a1) is connected to any one of the water inlet channels (d1). The connector (20) also has a connecting channel (d2). The connecting channel (d2) extends through the opposite sides of the connector (20) in a preset direction, and both ends of the connecting channel (d2) are sealed by plugs (25). The end of each water inlet channel (d1) opposite to the first water inlet (b11) is connected to the connecting channel (d2).

6. The battery pack according to claim 1, characterized in that, The connector (20) is connected to the frame (11) of the housing by a second weld mark (c2) extending along the edge of the connector (20), the second weld mark (c2) being an arc weld mark.

7. The battery pack according to claim 1, characterized in that, The battery pack also includes a sealing ring (60), which includes a sealing ring body (61) and a third protrusion (63) protruding from the sealing ring body (61). The sealing ring body (61) is located between the protective plate body (131) and the box frame (11), and the third protrusion (63) is located between the first protrusion (133) and the connector (20) and the second protrusion (33).

8. The battery pack according to claim 1, characterized in that, The box frame (11) has a first flange (110) on the side facing the protective plate (13). The first flange (110) extends along the peripheral edge of the box frame (11). The protective plate body (131) is locked and fixed to the first flange (110) by a second locking member (50). The side of the box frame (11) facing the protective plate (13) has a second groove (115) that passes through the first flange (110), and the second protrusion (33) passes through the second groove (115) to the outside of the box frame (11).

9. The battery pack according to claim 8, characterized in that, The two ends of the first flange (110) facing the second groove (115) and the portion of the second protrusion (33) located in the second groove (115) are connected by a third weld mark (c3), which is an arc weld mark.

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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