Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, and belongs to the technical field of batteries, the battery pack is provided with a plurality of liquid cooling plates, one end of each liquid cooling plate is provided with a port communicated with an internal flow channel, a pipe body is arranged and comprises a body, a first pipe section and a second pipe section, one end of the body is connected with the first pipe section, and the other end of the body is connected with the second pipe section; the first pipe section and the second pipe section are respectively connected with the adjacent liquid cooling plates and are communicated with the port, the first pipe section, the body and the second pipe section are communicated along the first direction to form a straight-through structure of the pipe body, the manufacturing cost of the pipe body is reduced, and the body, the first pipe section and the second pipe section are all rigid pipes; therefore, radial stress caused by the fact that the ends, provided with the ports, of the liquid cooling plates are arranged irregularly in the first direction can be absorbed and transmitted, the rigid pipes are arranged, the situation that the pipe body liquid cooling plates move when shaking, and consequently the battery monomers are staggered can be avoided, the connection stability between the battery monomers and electrical elements is guaranteed, and the service life of the battery monomers is prolonged. And the use safety of the battery pack is ensured.

Description

Technical Field

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

[0002] In existing battery packs, multiple liquid cooling plates are connected by pipes to achieve unified liquid supply and unified liquid discharge. For example, a supply pipe is used to connect multiple liquid cooling plates to provide heat transfer fluid, and an outlet pipe is used to connect multiple liquid cooling plates to discharge heat transfer fluid. However, the pipes located between two adjacent liquid cooling plates are usually equipped with flexible sections. When the liquid cooling plates are displaced, the pipes will move along with them due to the presence of the flexible sections. This will cause misalignment of the battery cells that are in contact with the liquid cooling plates, affecting the connection stability between the battery cells and the connected electrical components, and affecting the safety of the battery pack. Utility Model Content

[0003] The purpose of this application is to provide a battery pack and an electrical device to solve the problem that the connection stability between battery cells and electrical components decreases as the pipelines in the current battery pack move with the liquid cooling plate.

[0004] A first aspect of this application provides a battery pack having intersecting first, second, and third directions. The battery pack includes: a plurality of liquid cooling plates extending along the second direction; the plurality of liquid cooling plates being spaced apart along the first direction; each liquid cooling plate having a flow channel for heat-conducting fluid to flow through; and one end of each liquid cooling plate along the second direction having a port communicating with the flow channel; and a tube extending along the first direction, the tube including a body, a first tube segment, and a second tube segment; one end of the body along the first direction being connected to the first tube segment, and the other end being connected to the second tube segment; the tube being disposed between two adjacent liquid cooling plates along the first direction; the first tube segment and the second tube segment being respectively connected to an adjacent liquid cooling plate; and the first tube segment and the second tube segment being respectively communicating with an adjacent port; the first tube segment, the body, and the second tube segment communicating along the first direction; and the body, the first tube segment, and the second tube segment being all rigid tubes.

[0005] Optionally, the body, the first pipe segment, and the second pipe segment have the same stiffness.

[0006] Optionally, the battery pack further includes a current collector; the current collector includes a substrate and a connector, the substrate is connected to one end of the liquid cooling plate where the port is located, and the substrate communicates with the flow channel through the port; the connector extends along the first direction, the connector is inserted into the substrate, and the connector communicates with the substrate; along the first direction, one end of the connector is connected to an adjacent first pipe segment, and one end of the connector communicates with an adjacent first pipe segment; and / or, the other end of the connector is connected to an adjacent second pipe segment, and the other end of the connector communicates with an adjacent second pipe segment.

[0007] Optionally, the body includes a first end and a second end disposed opposite to each other along the first direction, the first end being connected to the first pipe segment and the second end being connected to the second pipe segment; the inner diameter of the body is R1 mm, the inner diameter of the first pipe segment is R2 mm, and the inner diameter of the second pipe segment is R3 mm; satisfying: R1 < R2, one end of the connector along the first direction is inserted into the adjacent first pipe segment, and the connector abuts against the first end; and / or, satisfying: R1 < R3, the other end of the connector along the first direction is inserted into the adjacent second pipe segment, and the connector abuts against the second end.

[0008] Optionally, the current collector further includes a sealing ring, which is fitted onto the connector, and the preset compression amount of the sealing ring is D0; the outer diameter of the connector inserted into the first pipe section is D1 mm, satisfying: D0 > R2 - D1; and / or, the outer diameter of the connector inserted into the second pipe section is D2 mm, satisfying: D0 > R3 - D2.

[0009] Optionally, the pipe body further includes a first reinforcing rib and a second reinforcing rib; the pipe body has an outer wall surface, the first reinforcing rib is disposed on the outer wall surface, the first reinforcing rib extends along the first direction, and at least one of the first pipe segment, the main body, and the second pipe segment is connected to the first reinforcing rib; the second reinforcing rib is disposed on the first pipe segment, and the second reinforcing rib surrounds the first pipe segment along the circumferential direction of the first pipe segment; and / or, the second reinforcing rib is disposed on the second pipe segment, and the second reinforcing rib surrounds the second pipe segment along the circumferential direction of the second pipe segment.

[0010] Optionally, the battery pack further includes a manifold and a connecting pipe; the manifold includes a body and a cover plate; the body is disposed on one side of the first pipe segment along the first direction, and a through hole is formed on the body along the first direction; the body has a first surface facing away from the pipe body along the first direction, and a groove is formed on the first surface, the groove has a bottom, and the through hole is formed through the bottom of the groove along the first direction; the cover plate covers the groove, and the cover plate and the bottom of the groove are spaced apart along the first direction, and an opening is formed on the cover plate along the first direction, the opening communicating with the groove; the connecting pipe extends along the first direction, one end of the connecting pipe along the first direction is connected to the body, the connecting pipe is connected to the through hole, and the other end of the connecting pipe is connected to the first pipe segment; the opening and the through hole that is formed through the bottom of the groove are spaced apart along the second direction.

[0011] Optionally, the bottom of the groove includes a first bottom surface, a second bottom surface, and a third bottom surface connected sequentially along the second direction; the second bottom surface is inclined to form a slope; along the first direction, the distance between the first bottom surface and the first surface is L1 mm, and the distance between the third bottom surface and the first surface is L2 mm, satisfying: L2 < L1; the through hole penetrates the third bottom surface along the first direction.

[0012] Optionally, the port includes an inlet port and an outlet port spaced apart along the third direction, the inlet port and the outlet port being located at the same end of the liquid cooling plate along the second direction; the tube body includes an inlet pipe and an outlet pipe spaced apart along the third direction, the inlet pipe communicating with the inlet port and the outlet pipe communicating with the outlet port; the through hole includes an inlet through hole and an outlet through hole spaced apart along the third direction, the inlet through hole and the groove spaced apart along the third direction, the outlet through hole penetrating the third bottom surface along the first direction; the connecting pipe includes a first connecting pipe and a second connecting pipe spaced apart along the third direction, one end of the first connecting pipe along the first direction being connected to the main body and communicating with the inlet through hole, and the other end being connected to the inlet pipe, one end of the second connecting pipe along the first direction being connected to the main body and communicating with the outlet through hole, and the other end being connected to the outlet pipe; at least one of the first connecting pipe and the second connecting pipe is a flexible pipe.

[0013] A second aspect of this application provides an electrical device including the battery pack described above.

[0014] In summary, the embodiments of this application provide a battery pack and an electrical device having the battery pack. The battery pack is provided with a plurality of liquid cooling plates that extend along a second direction. The plurality of liquid cooling plates are spaced apart along a first direction. One end of the liquid cooling plate along the second direction is provided with a port communicating with an internal flow channel. The battery pack is also provided with a tube that extends along the first direction. The tube includes a body, a first tube segment, and a second tube segment. One end of the body along the first direction is connected to the first tube segment, and the other end is connected to the second tube segment. The tube body is positioned between two adjacent liquid cooling plates. The first tube segment is connected to one of the adjacent liquid cooling plates and is also connected to the port of that liquid cooling plate. The second tube segment is connected to the other adjacent liquid cooling plate and is also connected to the port of that liquid cooling plate. The first tube segment, the main body, and the second tube segment are connected along a first direction, forming a straight-through structure of the tube body along the first direction. This eliminates the need for limiting structures such as clips, reducing the manufacturing cost of the tube body. Moreover, the main body, the first tube segment, and the second tube segment are all rigid tubes, which can absorb and transmit radial stress caused by the misalignment of the ports of multiple liquid cooling plates along the first direction. Furthermore, the rigid tube design can prevent the liquid cooling plates in the tube body from moving and causing misalignment of battery cells when shaking, ensuring the connection stability between battery cells and electrical components and ensuring the safety of the battery pack. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the first structure of the battery pack provided in the embodiments of this application;

[0017] Figure 2 yes Figure 1 The diagram shown is a structural representation of the battery pack after the tray has been removed.

[0018] Figure 3 yes Figure 1 A schematic diagram of the first angle of the combination of liquid cooling plate, tube body, current collector, manifold and connecting pipe in the battery pack shown;

[0019] Figure 4 yes Figure 1 The diagram shows a second-angle structural schematic of the combination of liquid cooling plate, tube, current collector, manifold and connecting pipe in the battery pack.

[0020] Figure 5 yes Figure 4 A magnified structural diagram at point A;

[0021] Figure 6 yes Figure 4 A magnified structural diagram at point B;

[0022] Figure 7 yes Figure 1 The diagram shows the combined structure of the battery pack, including the tube body, current collector, manifold, and connecting pipe.

[0023] Figure 8 yes Figure 7 CC-direction sectional view;

[0024] Figure 9 yes Figure 8 A magnified structural diagram at point D;

[0025] Figure 10 This is a schematic diagram of the structure of the liquid cooling plate in the battery pack provided in the embodiments of this application;

[0026] Figure 11 This is a schematic diagram of the structure of the current collector in the battery pack at the first angle provided in the embodiments of this application;

[0027] Figure 12 This is a schematic diagram of the second angle of the current collector in the battery pack provided in the embodiments of this application;

[0028] Figure 13 This is a schematic diagram of the structure of the tube in the battery pack provided in the embodiments of this application;

[0029] Figure 14 yes Figure 13 EE-directed sectional view;

[0030] Figure 15 This is a schematic diagram of the first angle of the manifold in the battery pack provided in the embodiments of this application;

[0031] Figure 16 This is a schematic diagram of the second angle of the manifold in the battery pack provided in the embodiments of this application;

[0032] Figure 17 yes Figure 15 Exploded view;

[0033] Figure 18 yes Figure 15 FF section view;

[0034] Figure 19 This is a schematic diagram of a second structure of the battery pack provided in the embodiments of this application;

[0035] Figure 20 yes Figure 19 The diagram shows the structure of the battery pack after the casing has been removed.

[0036] Explanation of key figure labels:

[0037] 1. Battery pack;

[0038] 10. Liquid cooling plate; 10a. First liquid cooling plate; 10b. Second liquid cooling plate; 101. Flow channel; 11. Port; 111. Liquid inlet port; 112. Liquid outlet port.

[0039] 20. Pipe body; 200. Outer wall surface; 201. Inlet pipe; 202. Outlet pipe; 21. Main body; 211. First end; 212. Second end; 22. First pipe section; 23. Second pipe section; 24. First reinforcing rib; 25. Second reinforcing rib.

[0040] 30. Current collector; 31. Substrate; 310. Guide cavity; 311. First diaphragm; 312. Second diaphragm; 32. Connector; 321. Inlet connector; 322. Outlet connector; 33. Sealing ring; 34. Partition plate.

[0041] 40. Manifold; 41. Main body; 410. Through hole; 4101. Liquid inlet through hole; 4102. Liquid outlet through hole; 411. First surface; 412. Second surface; 413. Groove; 414. Groove bottom; 4141. First bottom surface; 4142. Second bottom surface; 4143. Third bottom surface; 42. Cover plate; 420. Opening; 421. Protrusion.

[0042] 50. Connecting pipe; 51. First connecting pipe; 52. Second connecting pipe;

[0043] 60. Battery cell;

[0044] 70. Pallet;

[0045] 80. Box body; 801. Receiving cavity; 81. Opening;

[0046] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0047] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0048] 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," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships 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. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances or equal angles refer to a state in which the tolerance range is -1% to 1%.

[0052] This application provides an electrical device, including a battery pack 1, which serves as the power supply for the device. The electrical device may be, but is not limited to, mobile devices (e.g., mobile phones, laptops), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0053] In some embodiments, a battery pack 1 is provided, with reference to Figures 1-10 , Figures 13-14 as well as Figures 19-20 The battery pack 1 includes a liquid cooling plate 10 and a tube 20. The battery pack 1 has intersecting first directions X, second directions Y, and a third direction Z, as detailed below. Figures 1 to 20 In the embodiment shown, the first direction X, the second direction Y, and the third direction Z are all orthogonal to each other.

[0054] Reference Figures 1-6 , Figure 10 as well as Figures 19-20 There are multiple liquid cooling plates 10, which extend along the second direction Y. The multiple liquid cooling plates 10 are spaced apart along the first direction X. Each liquid cooling plate 10 has a flow channel 101 for the flow of heat-conducting fluid. One end of each liquid cooling plate 10 along the second direction Y has a port 11 communicating with the flow channel 101. Two adjacent liquid cooling plates along the first direction X are fitted with battery cells 60, which abut against the liquid cooling plates 10 along the first direction X. (Refer to...) Figure 10 Port 11 includes an inlet port 111 and an outlet port 112, which are located at the same end of the liquid cooling plate 10 along the second direction Y. The inlet port 111 and the outlet port 112 are spaced apart along the third direction Z. The flow channel 101 includes an inlet flow channel and an outlet flow channel spaced apart along the third direction Z. The inlet flow channel and the outlet flow channel extend along the second direction Y, respectively. One end of the inlet flow channel along the second direction Y is connected to the inlet port 111, and the other end is connected to the outlet flow channel inside the liquid cooling plate 10. One end of the outlet flow channel along the second direction Y is connected to the outlet port 112, and the other end is connected to the inlet flow channel inside the liquid cooling plate 10. The heat-conducting fluid enters the inlet flow channel through the inlet port 111 and then exits the liquid cooling plate 10 through the outlet flow channel and the outlet port 112. Thus, the temperature of the battery cell 60 is regulated by the circulating flow of the heat-conducting fluid in the flow channel 101.

[0055] Reference Figures 1-9 , Figures 13-14 as well as Figure 20The tube body 20 extends along the first direction X and includes a main body 21, a first tube segment 22, and a second tube segment 23. One end of the main body 21 along the first direction X is connected to the first tube segment 22, and the other end is connected to the second tube segment 23. The tube body 20 is disposed between two adjacent liquid cooling plates 10 along the first direction X. The first tube segment 22 and the second tube segment 23 are respectively connected to an adjacent liquid cooling plate 10, and the first tube segment 22 and the second tube segment 23 are respectively connected to an adjacent port 11. Specifically, refer to... Figures 1-6 The two adjacent liquid cooling plates 10 along the first direction X include a first liquid cooling plate 10a and a second liquid cooling plate 10b. The first pipe segment 22 is connected to the port 11 of the first liquid cooling plate 10a, and the second pipe segment 23 is connected to the port 11 of the second liquid cooling plate 10b.

[0056] Reference Figures 1 to 8 The pipe body 20 includes an inlet pipe 201 and an outlet pipe 202, which are spaced apart along a third direction Z. The inlet pipe 201 and the outlet pipe 202 are respectively disposed between the first liquid cooling plate 10a and the second liquid cooling plate 10b. The first section 22 of the inlet pipe 201 is connected to the inlet port 111 of the first liquid cooling plate 10a, and the second section 23 is connected to the inlet port 111 of the second liquid cooling plate 10b. The first section 22 of the outlet pipe 202 is connected to the outlet port 112 of the first liquid cooling plate 10a, and the second section 23 is connected to the outlet port 112 of the second liquid cooling plate 10b. Thus, heat-conducting fluid is provided to the liquid cooling plate 10 through the inlet pipe 201, and the heat-conducting fluid in the flow channel 101 of the liquid cooling plate 10 is discharged through the outlet pipe 202, realizing the circulation of heat-conducting fluid inside the liquid cooling plate 10 to regulate the temperature of the battery cell 60. The first pipe segment 22, the main body 21, and the second pipe segment 23 are connected along the first direction X, and the main body 21, the first pipe segment 22, and the second pipe segment 23 are all rigid pipes.

[0057] In existing battery packs, a supply pipe connects to the inlet of multiple liquid cooling plates to provide heat-conducting fluid to the liquid cooling plates, and an outlet pipe connects to the outlet of multiple liquid cooling plates to discharge the heat-conducting fluid from the liquid cooling plates. However, the supply pipe and / or outlet pipe sections located between two adjacent liquid cooling plates are usually equipped with flexible sections to alleviate leakage problems caused by misalignment between adjacent liquid cooling plates. However, with the presence of the flexible sections, when the liquid cooling plate moves along its extension direction, the pipe sections connected to the liquid cooling plate will move with the liquid cooling plate, which will lead to misalignment of the battery cells that abut against the liquid cooling plate. This will affect the connection stability between the battery cells and the connected electrical components (such as busbars), and affect the safety of the battery pack.

[0058] The battery pack 1 provided in this embodiment of the application includes multiple liquid cooling plates 10 extending along the second direction Y. These liquid cooling plates 10 are spaced apart along the first direction X. One end of each liquid cooling plate 10 along the second direction Y has a port 11 communicating with an internal flow channel 101. The port 11 includes an inlet port 111 and an outlet port 112. This places the inlet port 111 and outlet port 112 of the liquid cooling plate 10 at the same end, thereby improving the space utilization rate inside the battery pack 1 along the second direction Y. A tube 20 is also provided, extending along... Extending in the first direction X, the tube body 20 includes a main body 21, a first tube segment 22, and a second tube segment 23. One end of the main body 21 along the first direction X is connected to the first tube segment 22, and the other end is connected to the second tube segment 23. The tube body 20 is positioned between two adjacent liquid cooling plates 10 along the first direction X, that is, between adjacent first liquid cooling plates 10a and second liquid cooling plates 10b. The first tube segment 22 is connected to the first liquid cooling plate 10a and communicates with the port 11 of the first liquid cooling plate 10a. The second tube segment 23 is connected to the second liquid cooling plate 10b. The second pipe segment 23 is connected to port 11 of the second liquid cooling plate 10b, and the first pipe segment 22, the body 21, and the second pipe segment 23 are connected along the first direction X, forming a straight-through structure of the pipe body 20 along the first direction X. This eliminates the limiting structure of the snap-fit ​​between the first pipe segment 22 and the body 21, and between the second pipe segment 23 and the body, reducing the manufacturing cost of the pipe body 20. Moreover, the body 21, the first pipe segment 22, and the second pipe segment 23 are all rigid pipes, allowing the first pipe segment 22 and the second pipe segment 23 to absorb and transmit multiple liquid cooling plates 10 with ports 11 arranged irregularly at one end. The radial stress caused by the alignment results in the multiple liquid cooling plates 10 having one end of the port 11 neatly arranged along the first direction X. Moreover, the rigid tube arrangement prevents the connected liquid cooling plates 10 from moving when the battery pack 1 is impacted or shaken, thus preventing the battery cells 60 from being misaligned due to the movement of the liquid cooling plates 10 along the second direction Y. This ensures the installation stability of the battery cells 60 within the battery pack 1, thereby ensuring the connection stability between the battery cells 60 and electrical components, and guaranteeing the safety of the battery pack 1 in use.

[0059] In some implementations, in the first liquid cooling plate 10a and the second liquid cooling plate 10b adjacent to each other along the first direction X, a first pipe segment 22 is inserted into the adjacent liquid cooling plate 10. Specifically, the first pipe segment 22 is inserted into the first liquid cooling plate 10a and is threadedly connected to the first liquid cooling plate 10a, thereby absorbing the radial stress of the first liquid cooling plate 10a. The first pipe segment 22 is also connected to the port 11 of the first liquid cooling plate 10a. A second pipe segment 23 is inserted into the adjacent liquid cooling plate 10. Specifically, the second pipe segment 23 is inserted into the second liquid cooling plate 10b and is threadedly connected to the second liquid cooling plate 10b. The second pipe segment 23 is also connected to the port 11 of the second liquid cooling plate 10b, thereby absorbing the radial stress of the second liquid cooling plate 10b.

[0060] In some embodiments, refer to Figures 1-4 Two adjacent liquid cooling plates 10 along the first direction X are connected to each other along the second direction Y to form a U-shaped liquid cooling plate. In this U-shaped liquid cooling plate, the liquid inlet port 111 is provided on one of the two connected liquid cooling plates 10, and the liquid outlet port 112 is provided on the other liquid cooling plate 10 of the two connected liquid cooling plates 10.

[0061] In some embodiments, the body 21, the first pipe segment 22, and the second pipe segment 23 have the same stiffness, that is, there is no deformation zone in the pipe body 20 along its axial direction (parallel to the first direction X), thereby ensuring the smooth transmission of the radial stress absorbed by the first pipe segment 22 along the first direction X. Similarly, the smooth transmission of the radial stress absorbed by the second pipe segment 23 along the first direction X can be ensured, avoiding misalignment between two adjacent liquid cooling plates 10 due to stiffness differences, and avoiding deformation of the pipe body 20 along the second direction Y due to stiffness differences. Moreover, the body 21, the first pipe segment 22, and the second pipe segment 23 have uniform stiffness and hardness, and the inner and outer materials of the pipe body 20 are consistent. The pipe body 20 can be integrally formed, or the first pipe segment 22 can be welded to the body 21, and the second pipe segment 23 can be welded to the body 21. The manufacturing process is mature and reduces the manufacturing cost of the pipe body 20.

[0062] In some embodiments, refer to Figures 1-9 , Figures 11-12 as well as Figure 20 Battery pack 1 also includes current collector 30, see reference. Figures 7-9 as well as Figures 11-12The current collector 30 includes a base 31 and a connector 32. The base 31 is connected to one end of the liquid cooling plate 10 with a port 11, and the base 31 communicates with the flow channel 101 through the port 11. The connector 32 extends along the first direction X and is inserted into the base 31, communicating with the base 31. Along the first direction X, one end of the connector 32 is connected to and communicates with the adjacent first pipe segment 22, and the other end of the connector 32 is connected to and communicates with the adjacent second pipe segment 23. Specifically, two adjacent pipes 20 along the first direction X are connected and communicated through the connector 32, and the connector 32 is inserted into the pipe 20. The current collector 30 improves the connection stability between the liquid cooling plate 10 and the tube body 20. The tube body 20 is connected to the current collector 30 through the connector 32, which extends along the first direction X. Combined with the rigid tube design of the body 21, the first tube segment 22, and the second tube segment 23 in the tube body 20, the radial stress caused by the irregular arrangement of one end of the ports 11 of the multiple liquid cooling plates 10 can be transmitted to the tube body 20 through the connector 32, thereby improving the stability of radial stress absorption and transmission, ensuring the stability of the battery cell 60 that abuts against the liquid cooling plate 10, and avoiding damage to the liquid cooling plate 10 caused by the direct connection between the tube body 20 and the liquid cooling plate 10, thus ensuring the service life of the liquid cooling plate 10.

[0063] Reference Figure 11 and Figure 12 Each collector 30 has two connectors 32, including an inlet connector 321 and an outlet connector 322. The inlet connector 321 and the outlet connector 322 are spaced apart along the third direction Z. The inlet connector 321 is used to provide heat-conducting fluid to the flow channel 101 of the liquid cooling plate 10, and the outlet connector 322 is used to discharge the heat-conducting fluid in the flow channel 101 of the liquid cooling plate 10. The two ends of the inlet connector 321 along the first direction X are respectively connected to the adjacent inlet pipe 201, and the two ends of the outlet connector 322 along the first direction X are respectively connected to the adjacent outlet pipe 202.

[0064] In some embodiments, refer to Figures 6-8 Among the multiple liquid cooling plates 10 spaced apart along the first direction X, the connector 32 of the current collector 30 on the liquid cooling plate 10 at the end is connected to the pipe body 20 at only one end.

[0065] In some embodiments, refer to Figure 9 and Figure 14 The main body 21 includes a first end 211 and a second end 212 disposed opposite to each other along the first direction X. The first end 211 is connected to the first pipe segment 22, and the second end 212 is connected to the second pipe segment 23. (Refer to...) Figure 8 and Figure 9One end of connector 32 along the first direction X is inserted into the adjacent first pipe section 22, and connector 32 abuts against the first end 211, as shown in the reference. Figure 14 The inner diameter of the body 21 is R1 mm, and the inner diameter of the first pipe section 22 is R2 mm, satisfying R1 < R2. The design of R1 < R2 makes the inner diameter of the body 21 smaller than the inner diameter of the first pipe section 22, thereby forming a protrusion on the inner wall of the body 21 on the first pipe section 22. The connector 32 is inserted into the first pipe section 22, and the connector 32 abuts against the first end 211 of the body 21, thereby ensuring the assembly stability between the connector 32 and the first pipe section 22, and further ensuring the stability of the first pipe section 22 in absorbing and transmitting radial stress through the connector 32.

[0066] In some embodiments, refer to Figure 8 and Figure 9 The other end of connector 32 along the first direction X, that is, the end of connector 32 along the first direction X away from the first pipe section 22, is inserted into the adjacent second pipe section 23, and connector 32 abuts against the second end 212, as shown in the reference. Figure 14 The inner diameter of the second pipe section 23 is R3 mm, satisfying R1 < R3. The design of R1 < R3 makes the inner diameter of the body 21 smaller than the inner diameter of the second pipe section 23, thereby forming a protrusion on the inner wall of the body 21 on the second pipe section 23. The connector 32 is inserted into the second pipe section 23 and abuts against the second end 212 of the body 21, thereby ensuring the assembly stability between the connector 32 and the second pipe section 23, and further ensuring the stability of the second pipe section 23 in absorbing and transmitting radial stress through the connector 32.

[0067] In some embodiments, refer to Figure 8 and Figure 9 The current collector 30 also includes a sealing ring 33, which is sleeved on the connector 32. The preset compression amount of the sealing ring 33 is D0, as shown in the reference. Figure 9 The outer diameter of the connector 32 inserted into the first pipe section 22 is D1 mm, which satisfies: D0 > R2 - D1. That is, when the connector 32 is inserted into the first pipe section 22, there is a gap between the outer wall of the connector 32 and the inner wall of the first pipe section 22. The compression of the sealing ring 33 is greater than the difference between the inner diameter R2 of the first pipe section 22 and the outer diameter of the connector 32 inserted into the first pipe section 22. This allows the sealing ring 33 to fill the gap between the outer wall of the connector 32 and the inner wall of the first pipe section 22, thereby ensuring the sealing between the connector 32 and the first pipe section 22 and preventing the heat transfer fluid in the liquid cooling plate 10 from leaking from the gap between the connector 32 and the first pipe section 22, thus ensuring the safety of the battery pack 1.

[0068] The preset compression amount D0 (in %) of the sealing ring 33 refers to the ratio of the amount of compression of the sealing ring 33 in the compression direction to its free size before compression. The calculation formula is: D0 = (d0 - h0) / d0 × 100%, where d0 is the cross-sectional diameter of the sealing ring 33 in its free state, and h0 is the cross-sectional height of the sealing ring 33 after compression. Specifically... Figure 8 and Figure 9 In the embodiment shown, the cross section of the sealing ring 33 is the surface perpendicular to the first direction X, and the height of the cross section of the sealing ring 33 after compression is the height of the sealing ring 33 along the third direction Z after compression.

[0069] In some embodiments, refer to Figure 8 and Figure 9 The outer diameter of the connector 32 inserted into the second pipe section 23 is D2 mm, which satisfies: D0 > R3 - D2. That is, when the connector 32 is inserted into the second pipe section 23, there is a gap between the outer wall of the connector 32 and the inner wall of the second pipe section 23. The compression of the sealing ring 33 is greater than the difference between the inner diameter R3 of the second pipe section 23 and the outer diameter of the connector 32 inserted into the second pipe section 23. This allows the sealing ring 33 to fill the gap between the outer wall of the connector 32 and the inner wall of the second pipe section 23, thereby ensuring the sealing between the connector 32 and the second pipe section 23 and preventing the heat transfer fluid in the liquid cooling plate 10 from leaking from the gap between the connector 32 and the second pipe section 23, thus ensuring the safety of the battery pack 1.

[0070] In some embodiments, refer to Figures 5-6 , Figures 8-9 as well as Figures 13-14 The tube body 20 also includes a first reinforcing rib 24, as shown in the reference. Figure 13 and Figure 14 The pipe body 20 has an outer wall surface 200, and a first reinforcing rib 24 is disposed on the outer wall surface 200. The first reinforcing rib 24 extends along a first direction X. At least one of the first pipe segment 22, the main body 21, and the second pipe segment 23 is connected to the first reinforcing rib 24, as detailed below. Figures 5-6 , Figures 8-9 as well as Figures 13-14 In the embodiment shown, the first pipe segment 22, the body 21, and the second pipe segment 23 are all connected to the first reinforcing rib 24. The arrangement of the first reinforcing rib 24 and its design of extending along the first direction X enable the first reinforcing rib 24 to enhance the ability of the pipe body 20 to absorb and transmit the radial stress generated by the liquid cooling plate 10, and to enhance the ability of the pipe body 20 and the liquid cooling plate 10 to withstand concentrated stress during assembly, thereby improving the overall strength of the pipe body 20 and the assembly stability between the pipe body 20 and the liquid cooling plate 10.

[0071] In some embodiments, refer to Figures 5-6 , Figures 8-9 as well as Figures 13-14The tube body 20 also includes a second reinforcing rib 25, which is disposed on the first tube segment 22 and surrounds the first tube segment 22 in the circumferential direction. The design of the second reinforcing rib 25 can improve the strength of the first tube segment 22, thereby enhancing the ability of the first tube segment 22 to absorb and transmit the radial stress generated by the connected liquid cooling plate 10, and ensuring the connection stability between the first tube segment 22 and the liquid cooling plate 10.

[0072] In some embodiments, refer to Figures 5-6 , Figures 8-9 as well as Figures 13-14 The second reinforcing rib 25 is disposed on the second pipe section 23 and surrounds the second pipe section 23 in the circumferential direction. The design of the second reinforcing rib 25 can improve the strength of the second pipe section 23, thereby enhancing the ability of the second pipe section 23 to absorb and transmit the radial stress generated by the connected liquid cooling plate 10, and ensuring the connection stability between the second pipe section 23 and the liquid cooling plate 10.

[0073] In some embodiments, refer to Figures 1-5 , Figures 7-8 as well as Figures 15-20 The battery pack 1 also includes a manifold 40 and a connecting pipe 50. The manifold 40 includes a main body 41 and a cover plate 42. The main body 41 is disposed on one side of the first pipe segment 22 along the first direction X. Figure 8 and Figure 15 The main body 41 has a through hole 410 extending through the main body 41 along the first direction X, as shown in the figure. Figures 15-18 The main body 41 includes a first surface 411 and a second surface 412 disposed opposite to each other along the first direction X. The first surface 411 is away from the tube body 20 along the first direction X. Figures 17-18 A groove 413 is provided on the first surface 411. The groove 413 has a bottom 414. A through hole 410 penetrates the bottom 414 along the first direction X. (Refer to...) Figures 1-5 , Figures 7-8 , Figure 15 as well as Figures 17-18 The cover plate 42 covers the groove 413, and the cover plate 42 and the bottom of the groove 414 are spaced apart along the first direction X, as shown in the figure. Figure 5 , Figures 7-8 , Figure 15 as well as Figures 17-18 The cover plate 42 has an opening 420 that penetrates the cover plate 42 along the first direction X. The opening 420 communicates with the groove 413. The opening 420 and the through hole 410 that penetrates the bottom of the groove 414 are spaced apart along the second direction Y. (Refer to...) Figures 1-5 as well as Figures 7-8 The connecting pipe 50 extends along the first direction X. One end of the connecting pipe 50 along the first direction X is connected to the main body 41. The connecting pipe 50 communicates with the through hole 410. The other end of the connecting pipe 50 is connected to the first pipe section 22.

[0074] Specifically, refer to Figure 5 , Figures 7-8 as well as Figures 15-18 The through-hole 410 includes an inlet through-hole 4101 and an outlet through-hole 4102 spaced apart along a third direction Z. The inlet through-hole 4101 penetrates the main body 41 along a first direction X, and the outlet through-hole 4102 penetrates the bottom of the groove 414 along the first direction X and communicates with the interior of the groove 413. The opening 420 and the outlet through-hole 4102 are spaced apart along a second direction Y. (Refer to...) Figures 1-5 as well as Figures 7-8 The connecting pipe 50 includes a first connecting pipe 51 and a second connecting pipe 52 spaced apart along the third direction Z. One end of the first connecting pipe 51 is connected to the liquid inlet hole 4101, and the other end is connected to the first pipe section 22 on the liquid inlet pipe 201. One end of the second connecting pipe 52 is connected to the liquid outlet hole 4102, and the other end is connected to the first pipe section 22 on the liquid outlet pipe 202. Thus, heat-conducting fluid can be provided to the liquid cooling plate 10 through the cooperation of the liquid inlet hole 4101, the first connecting pipe 51 and the liquid inlet pipe 201. Through the cooperative design of the liquid outlet pipe 202, the second connecting pipe 52, the liquid outlet hole 4102, the groove 413 and the opening 420, the heat-conducting fluid in the liquid cooling plate 10 is discharged from the opening 420, realizing the circulation of the heat-conducting fluid.

[0075] In some embodiments, refer to Figure 17 and Figure 18 The bottom of the groove 414 includes a first bottom surface 4141, a second bottom surface 4142, and a third bottom surface 4143 connected sequentially along the second direction Y. The second bottom surface 4142 is inclined to form a slope. A through hole 410 penetrates the third bottom surface 4143 along the first direction X. An opening 420 on the cover plate 42 is positioned opposite to the first bottom surface 4141. (Refer to...) Figure 17 Along the first direction X, the distance between the first bottom surface 4141 and the first surface 411 of the main body 41 is L1 mm, and the distance between the third bottom surface 4143 and the first surface 411 is L2 mm, satisfying: L2 < L1. This makes the distance between the third bottom surface 4143 and the first surface 411 smaller than the distance between the first bottom surface 4141 and the first surface 411. This makes the second bottom surface 4142 connecting the first bottom surface 4141 and the third bottom surface 4143 form a slope structure design. This allows the heat-conducting fluid entering the groove 413 through the liquid outlet hole 4102 to flow towards the first bottom surface 4141 through the second bottom surface 4142 at a faster speed. This reduces the flow resistance of the bottom 414 of the groove to the flow of the heat-conducting fluid in the groove 413, allowing the heat-conducting fluid to be quickly discharged through the opening 420. This ensures the circulation speed of the heat-conducting fluid and ensures the effect of the liquid cooling plate 10 on the temperature regulation of the battery cell 60.

[0076] In some embodiments, the first connecting pipe 51 is a flexible pipe, such as a corrugated pipe. The flexible pipe can ensure the connection stability between the liquid inlet hole 4101 and the first pipe section 22 on the liquid inlet pipe 201 through the first connecting pipe 51, and prevent the heat transfer fluid from leaking due to shaking of the manifold 40.

[0077] In some embodiments, the second connecting pipe 52 is a flexible pipe, such as a corrugated pipe. The flexible pipe can ensure the connection stability between the liquid outlet hole 4102 and the first pipe section 22 on the liquid outlet pipe 202 through the second connecting pipe 52, and prevent the heat transfer fluid from leaking due to shaking of the manifold 40.

[0078] In some embodiments, refer to Figure 1 and Figure 20 The battery pack 1 also includes a tray 70, on which the liquid cooling plate 10 and the battery cell 60 are all disposed. The tray 70 forms a support for the battery cell 60 to ensure the installation stability of the battery cell 60 in the battery pack 1.

[0079] In some embodiments, refer to Figure 20 The number of trays 70 is two, and they are spaced apart along the third direction Z, thereby improving the space utilization rate of the battery pack 1 in the third direction Z.

[0080] In some embodiments, refer to Figure 19 The battery pack 1 also includes a housing 80, which has a receiving cavity 801 inside. An opening 81 is provided on the side wall of the housing 80. The first surface 411 of the main body 41 in the manifold 40 is exposed through the opening 81, and the cover plate 42 is exposed through the opening 81. An external liquid supply pipe is connected to the liquid inlet hole 4101 to provide heat-conducting fluid, and an external liquid return pipe is connected to the opening 420 to discharge heat-conducting fluid.

[0081] The technical solutions provided by the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack having intersecting first, second, and third directions, characterized in that, The battery pack includes: Multiple liquid cooling plates extend along the second direction and are spaced apart along the first direction. Each liquid cooling plate has a flow channel for the flow of heat-conducting fluid inside, and one end of each liquid cooling plate along the second direction has a port communicating with the flow channel. The tube extends along the first direction and includes a main body, a first tube segment, and a second tube segment. One end of the main body along the first direction is connected to the first tube segment, and the other end is connected to the second tube segment. The tube is disposed between two adjacent liquid cooling plates along the first direction. The first tube segment and the second tube segment are respectively connected to an adjacent liquid cooling plate, and the first tube segment and the second tube segment are respectively connected to an adjacent port. The first pipe segment, the main body, and the second pipe segment are connected along the first direction; The main body, the first pipe section, and the second pipe section are all rigid pipes.

2. The battery pack as described in claim 1, characterized in that, The main body, the first pipe section, and the second pipe section have the same rigidity.

3. The battery pack as described in claim 1, characterized in that, The battery pack also includes a current collector; The current collector includes a substrate and a connector. The substrate is connected to one end of the liquid cooling plate where the port is located, and the substrate communicates with the flow channel through the port. The connector extends along the first direction, is inserted into the base, and communicates with the base. Along the first direction, one end of the connector is connected to the adjacent first pipe segment, and the other end of the connector is in communication with the adjacent first pipe segment; and / or, the other end of the connector is connected to the adjacent second pipe segment, and the other end of the connector is in communication with the adjacent second pipe segment.

4. The battery pack as described in claim 3, characterized in that, The body includes a first end and a second end disposed opposite to each other along the first direction, the first end being connected to the first pipe segment and the second end being connected to the second pipe segment; The inner diameter of the main body is R1 mm, the inner diameter of the first pipe section is R2 mm, and the inner diameter of the second pipe section is R3 mm. Satisfying: R1 < R2, one end of the connector along the first direction is inserted into the adjacent first pipe section, and the connector abuts against the first end; And / or, satisfying: R1 < R3, the other end of the connector along the first direction is inserted into the adjacent second pipe section, and the connector abuts against the second end.

5. The battery pack as described in claim 4, characterized in that, The current collector also includes a sealing ring, which is sleeved on the connector, and the preset compression amount of the sealing ring is D0; The outer diameter of the connector inserted into the first pipe section is D1 mm, which satisfies: D0 > R2 - D1; And / or, the outer diameter of the connector inserted into the second pipe section is D2 mm, satisfying: D0 > R3 - D2.

6. The battery pack as described in claim 3, characterized in that, The tube body also includes a first reinforcing rib and a second reinforcing rib; The pipe body has an outer wall surface, the first reinforcing rib is disposed on the outer wall surface, the first reinforcing rib extends along the first direction, and at least one of the first pipe segment, the main body and the second pipe segment is connected to the first reinforcing rib. The second reinforcing rib is disposed on the first pipe segment, and the second reinforcing rib surrounds the first pipe segment in the circumferential direction; And / or, the second reinforcing rib is disposed on the second pipe segment, and the second reinforcing rib surrounds the second pipe segment in the circumferential direction.

7. The battery pack as claimed in claim 1, characterized in that, The battery pack also includes a manifold and a connecting pipe; The manifold includes a main body and a cover plate; The main body is disposed on one side of the first pipe segment along the first direction, and a through hole is provided on the main body along the first direction; The main body has a first surface that is opposite to the tube body along the first direction, and a groove is formed on the first surface. The groove has a bottom, and the through hole penetrates the bottom of the groove along the first direction. The cover plate covers the groove, and the cover plate and the bottom of the groove are spaced apart along the first direction. The cover plate has an opening that passes through the cover plate along the first direction and communicates with the groove. The connecting pipe extends along the first direction, one end of the connecting pipe along the first direction is connected to the main body, the connecting pipe communicates with the through hole, and the other end of the connecting pipe is connected to the first pipe segment; The opening and the through hole penetrating the bottom of the groove are spaced apart along the second direction.

8. The battery pack as described in claim 7, characterized in that, The bottom of the tank includes a first bottom surface, a second bottom surface, and a third bottom surface that are sequentially connected along the second direction; The second bottom surface is inclined to form a slope; Along the first direction, the distance between the first bottom surface and the first surface is L1 mm, and the distance between the third bottom surface and the first surface is L2 mm, satisfying: L2 < L1; The through hole extends through the third bottom surface along the first direction.

9. The battery pack as described in claim 8, characterized in that, The port includes an inlet port and an outlet port spaced apart along the third direction, and the inlet port and the outlet port are located at the same end of the liquid cooling plate along the second direction; The tube body includes an inlet pipe and an outlet pipe spaced apart along the third direction, the inlet pipe being connected to the inlet port and the outlet pipe being connected to the outlet port; The through hole includes an inlet through hole and an outlet through hole spaced apart along the third direction. The inlet through hole and the groove are spaced apart along the third direction, and the outlet through hole penetrates the third bottom surface along the first direction. The connecting pipe includes a first connecting pipe and a second connecting pipe spaced apart along the third direction. One end of the first connecting pipe along the first direction is connected to the main body and communicates with the liquid inlet hole, and the other end is connected to the liquid inlet pipe. One end of the second connecting pipe along the first direction is connected to the main body and communicates with the liquid outlet hole, and the other end is connected to the liquid outlet pipe. At least one of the first connecting pipe and the second connecting pipe is a flexible pipe.

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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