Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries, in the battery pack, a first liquid inlet end and a first liquid outlet end of a first liquid cooling plate are arranged at the same end, a first liquid inlet pipe is communicated with the first liquid inlet end, and a second liquid inlet pipe is communicated with the first liquid outlet end; a current collector is arranged on the same side of the first liquid inlet pipe and the first liquid outlet pipe in the first direction, a liquid supply flow channel and a liquid return flow channel which extend in the third direction are arranged in a body of the current collector, the first liquid inlet pipe extends in the first direction and is communicated with the liquid supply flow channel, and the first liquid outlet pipe extends in the first direction and is communicated with the liquid return flow channel. Therefore, the liquid inlet direction of the liquid inlet pipe and the liquid outlet direction of the liquid outlet pipe are changed from the first direction to the third direction, so that the body absorbs the assembly tolerance between the first liquid inlet pipe and the first liquid outlet pipe, the assembly convenience is improved, the use safety of the battery pack is ensured, the internal space utilization rate of the battery pack can be improved, and the energy density of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] In the existing battery pack, liquid is centrally supplied and returned to the liquid cooling plate arranged in the box through the liquid supply pipe and the liquid return pipe arranged on the box. However, the liquid inlet direction of the liquid inlet pipe intersects with the liquid supply direction of the liquid supply pipe, and / or the liquid outlet direction of the liquid outlet pipe intersects with the liquid return direction of the liquid return pipe. Multiple adapters are required to ensure the connection between the liquid supply pipe and the liquid inlet pipe, and the liquid return pipe and the liquid outlet pipe. The provision of multiple adapters leads to assembly tolerances between the liquid inlet pipe and the liquid outlet pipe, which in turn affects the connection stability and connection sealing between the adapter and the liquid inlet pipe and the liquid outlet pipe, affecting the safety of the battery pack. Utility Model Content

[0003] The purpose of the present application is to provide a battery pack and electrical equipment to solve the problem that the setting of the adapter in the current battery pack causes the existence of assembly tolerances that affect the connection stability and sealing.

[0004] A first aspect of an embodiment of the present application provides a battery pack having a first direction, a second direction, and a third direction intersecting in pairs, the battery pack comprising: a first liquid cooling plate extending along the second direction, the first flow channel for a heat transfer fluid being provided therein, the first liquid cooling plate having a first liquid inlet end and a first liquid outlet end respectively connected to the first flow channel at one end along the second direction; a first liquid inlet pipe extending along the first direction, the first liquid inlet end being connected to the first liquid inlet pipe; a first liquid outlet pipe extending along the first direction and spaced apart from the first liquid inlet pipe along the third direction, the first liquid outlet end being connected to the first liquid outlet pipe; a current collector comprising a body, the body having a liquid supply channel and a liquid return channel respectively extending along the third direction, the liquid supply channel and the liquid return channel being spaced apart from each other along the second direction; the body being disposed on the same side of the first liquid inlet pipe and the first liquid outlet pipe along the first direction, the first liquid inlet pipe being connected to the body and the first liquid inlet pipe being connected to the liquid supply channel, and the first liquid outlet pipe being connected to the body and the first liquid outlet pipe being connected to the return channel.

[0005] Optionally, the current collector also includes a first connecting part and a second connecting part; along the first direction, one end of the first connecting part is connected to the main body, and the other end is connected to the first liquid inlet pipe; a first branch channel connected to the liquid supply channel is provided inside the first connecting part, and the first liquid inlet pipe is connected to the liquid supply channel through the first branch channel; along the first direction, one end of the second connecting part is connected to the main body, and the other end is connected to the first liquid outlet pipe; a second branch channel connected to the return liquid channel is provided inside the second connecting part, and the first liquid outlet pipe is connected to the return liquid channel through the second branch channel.

[0006] Optionally, the main body has a first surface intersecting with the third direction, and along the third direction, the first connecting part and the second connecting part are spaced apart, and the orthographic projection of the first connecting part on the plane where the first surface is located at least partially overlaps with the orthographic projection of the second connecting part on the plane where the first surface is located.

[0007] Optionally, along the third direction, a protrusion is protruding from the first surface, and a third branch channel connected to the liquid supply channel is provided inside the protrusion; the protrusion and the second connecting portion are spaced apart along the second direction; the first connecting portion includes a connecting section, one end of the connecting section along the first direction is connected to the first liquid inlet pipe, and the other end of the connecting section is bent along the second direction toward the protrusion to form a bending section, the connecting section is connected to the protrusion through the bending section, and the first branch channel is connected to the liquid supply channel through the third branch channel; along the third direction, the orthographic projection of the connecting section on the plane where the first surface is located at least partially overlaps with the orthographic projection of the second connecting portion on the plane where the first surface is located.

[0008] Optionally, along the first direction, the first branch channel located in the connecting section has a first axis, the second branch channel has a second axis, the first liquid inlet pipe has a third axis, and the first liquid outlet pipe has a fourth axis; along the third direction, the distance between the first axis and the second axis is the same as the distance between the third axis and the fourth axis.

[0009] Optionally, the battery pack further includes a second liquid cooling plate, a second liquid inlet pipe and a second liquid outlet pipe; the second liquid cooling plate and the first liquid cooling plate are spaced apart along the third direction, a second flow channel for the flow of heat-conducting fluid is provided inside the second liquid cooling plate, and the second liquid cooling plate is provided with a second liquid inlet end and a liquid outlet end respectively connected to the second flow channel at one end adjacent to the first liquid inlet pipe along the second direction; the second liquid inlet pipe and the second liquid outlet pipe extend respectively along the first direction; the first liquid inlet pipe, the first liquid outlet pipe, the second liquid inlet pipe and the second liquid outlet pipe are all spaced apart along the third direction, the second liquid inlet end is connected to the second liquid inlet pipe, and the second liquid outlet end is connected to the second liquid outlet pipe; the second liquid inlet pipe is connected to the protrusion and is connected to the liquid supply channel, and the second liquid outlet pipe is connected to the main body and is connected to the liquid return channel.

[0010] Optionally, the current collector also includes a first connecting tube and a second connecting tube; the second liquid inlet pipe is connected to the main body through the first connecting tube, and the second liquid outlet pipe is connected to the main body through the second connecting tube; the first connecting tube includes a first section and a second section, the first section is connected to the second liquid inlet pipe through the second section, the second connecting tube includes a third section and a fourth section, the third section is connected to the second liquid outlet pipe through the fourth section; the first section and the third section extend along the third direction respectively, and the first section and the third section are spaced apart along the second direction; one end of the first section is connected to the main body, and the other end is bent along the second direction toward the direction close to the third section and connected to the second section, one end of the third section is connected to the main body, and the other end is connected to the fourth section; along the third direction, the second section and the fourth section are spaced apart, and the orthographic projection of the second section on the plane where the first surface is located, the orthographic projection of the fourth section on the plane where the first surface is located, and the orthographic projection of the connecting section on the plane where the first surface is located at least partially overlap.

[0011] Optionally, the battery pack further includes a liquid supply pipe and a liquid return pipe; along the third direction, the main body has a first surface and a second surface arranged opposite to each other, the second surface is provided with a liquid supply end connected to the liquid supply channel and a liquid return end connected to the liquid return channel; the liquid supply channel and the liquid return channel are spaced apart along the second direction; along the third direction, one end of the liquid supply pipe is inserted into the liquid supply end and extends into the liquid supply channel, and one end of the liquid return pipe is inserted into the liquid return end and extends into the liquid return channel; along the third direction, the distance that the liquid supply pipe extends into the liquid supply channel is adjustable, and / or the distance that the liquid return pipe extends into the liquid return channel is adjustable.

[0012] Optionally, the battery pack further includes a temperature sensor, which is disposed on the body to monitor the temperature in the liquid supply channel and the liquid return channel.

[0013] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0014] In summary, the embodiments of the present application provide a battery pack and an electrical device having the battery pack, wherein the battery pack is configured such that a first liquid inlet end and a first liquid outlet end of a first liquid cooling plate are arranged at the same end of the first liquid cooling plate, a first liquid inlet pipe is arranged to be connected to the first liquid inlet end, a second liquid inlet pipe is arranged to be connected to the first liquid outlet end, and a current collector is arranged on the same side of the first liquid inlet pipe and the first liquid outlet pipe along the first direction, a liquid supply channel and a liquid return channel extending along a third direction are arranged inside the body of the current collector, and the liquid supply channel and the liquid return channel are arranged at intervals along the second direction. The first liquid inlet pipe extends along the first direction, is connected to the main body and communicates with the liquid supply channel, and the first liquid outlet pipe extends along the first direction, is connected to the main body and communicates with the liquid return channel, thereby changing the liquid inlet direction of the first liquid inlet pipe and the liquid outlet direction of the first liquid outlet pipe from the first direction to the third direction. The structural design of the connection between the first liquid inlet pipe, the first liquid outlet pipe and the main body can enable the main body to absorb the assembly tolerance between the first liquid inlet pipe and the first liquid outlet pipe, thereby improving the assembly convenience, ensuring the safety of the battery pack, and improving the internal space utilization of the battery pack and the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic structural diagram of a battery pack provided by an embodiment of the present application from a first angle;

[0017] Figure 2 is a schematic structural diagram of a battery pack provided by an embodiment of the present application from a second angle;

[0018] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at point A;

[0019] Figure 4 3 is a schematic structural diagram of the battery pack provided in an embodiment of the present application from a third angle;

[0020] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at point B;

[0021] Figure 6 2 is a schematic structural diagram of a battery pack provided in an embodiment of the present application from a fourth angle;

[0022] Figure 7 yes Figure 6 Schematic diagram of a local enlarged structure;

[0023] Figure 8 This is a schematic diagram of the combined structure of the current collector, the first liquid inlet pipe, the first liquid outlet pipe, the second liquid inlet pipe, the second liquid outlet pipe, the first manifold, the second manifold, the liquid supply pipe, and the liquid return pipe in the battery pack provided in an embodiment of the present application;

[0024] Figure 9 yes Figure 8 CC sectional view;

[0025] Figure 10 yes Figure 9 A schematic diagram of the enlarged structure at D;

[0026] Figure 11 This is a schematic diagram of the combined structure of the current collector, liquid supply pipe, and liquid return pipe in the battery pack provided in an embodiment of the present application;

[0027] Figure 12 This is a schematic diagram of the combined structure of the body, the first connecting portion, and the second connecting portion of the current collector of the battery pack provided in an embodiment of the present application;

[0028] Figure 13 yes Figure 12 EE cross-sectional view;

[0029] Figure 14 yes Figure 12 FF cross-sectional view;

[0030] Figure 15 yes Figure 12 GG cross-sectional view;

[0031] Figure 16 Schematic diagram of the structure of the first liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0032] Figure 17 This is a schematic diagram of a portion of the structure of the first liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0033] Figure 18 Schematic diagram of the structure of the second liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0034] Figure 19 This is a partial structural diagram of the second liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0035] Figure 20 It is a schematic diagram of the structure of a battery cell in the battery pack provided in an embodiment of the present application.

[0036] Description of main reference numerals:

[0037] 1. Battery pack;

[0038] 10. First liquid cooling plate, 11. First liquid inlet, 12. First liquid outlet, 101. First flow channel, 13. First manifold, 14. First blocking member, 15. First tray;

[0039] 20. First liquid inlet pipe, 21. Third axis;

[0040] 30. First liquid outlet pipe, 31. Fourth axis;

[0041] 40. Current collector, 401. Liquid supply channel, 402. Liquid return channel, 403. Liquid supply end, 404. Liquid return end, 41. Main body, 411. First surface, 412. Second surface, 413. Mounting hole, 414. Core pulling hole, 42. First connecting portion, 420. First branch channel, 421. Connecting section, 422. Bend section, 423. First axis, 43. Second connecting portion, 430. Second branch channel, 431. Second axis, 44. Protrusion, 440. Third branch channel, 45. First connecting pipe, 451. First section, 452. Second section, 46. Second connecting pipe, 461. Third section, 462. Fourth section, 463. Fifth axis;

[0042] 50. Second liquid cooling plate, 501. Second flow channel, 51. Second liquid inlet, 52. Second liquid outlet, 53. Second manifold, 54. Second blocking member, 55. Second tray;

[0043] 60. Second liquid inlet pipe;

[0044] 70. Second liquid outlet pipe, 71. Sixth axis;

[0045] 81, liquid supply pipe, 811, seventh axis, 82, liquid return pipe, 821, eighth axis;

[0046] 90. Temperature sensor, 91. Cover, 92. Battery cell, 921. First end, 922. Second end, 923. Side wall, 924. Terminal;

[0047] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0051] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the examples, "parallel" refers to a state where the angle formed between two lines, between a line and a plane, or between two planes is between -1° and 1°. Furthermore, "perpendicular" refers to a state where the angle formed between two lines, between a line and a plane, or between two planes is between 89° and 91°. Equal distances or equal angles refer to a state where the tolerance range is between -1% and 1%.

[0053] The present embodiment provides an electrical device including a battery pack 1, which serves as a power source for the electrical device. The electrical device may include, but is not limited to, mobile devices (e.g., mobile phones, laptops, etc.), 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, satellites, energy storage systems, etc.

[0054] In some embodiments of the present application, a battery pack 1 is provided, referring to Figures 1 to 17 as well as Figure 20 The battery pack 1 includes: a first liquid cooling plate 10, a first liquid inlet pipe 20, a first liquid outlet pipe 30, a current collector 40 and a battery cell 92. The battery pack 1 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figures 1 to 20 In the illustrated embodiment, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other.

[0055] Reference Figures 1 to 5 as well as Figures 16 and 17 , the first liquid cooling plate 10 extends along the second direction Y, referring to Figures 1 to 3 There are multiple first liquid cooling plates 10, and the multiple first liquid cooling plates 10 are spaced apart along the first direction X. Two adjacent first liquid cooling plates 10 along the first direction X are provided with multiple battery cells 92, and the battery cells 92 abut against the first liquid cooling plates 10 along the first direction X. Figure 17 The first liquid cooling plate 10 is provided with a first flow channel 101 for the flow of heat transfer fluid. Figure 3 and Figure 17, one end of the first liquid cooling plate 10 along the second direction Y is provided with a first liquid inlet end 11 and a first liquid outlet end 12 respectively connected to the first flow channel 101, that is, the first liquid inlet end 11 and the first liquid outlet end 12 are arranged at the same end of the first liquid cooling plate 10 along the second direction Y, the first liquid inlet end 11 and the first liquid outlet end 12 are arranged at intervals along the third direction Z, the first flow channel 101 includes a first liquid inlet flow channel and a first liquid outlet flow channel arranged at intervals along the third direction Z, the first liquid inlet flow channel and the first liquid outlet flow channel respectively extend along the second direction Y, the first liquid inlet flow channel extends along the second direction Y, One end in the direction Y is connected to the first liquid inlet end 11, and the other end is connected to the first liquid outlet channel on the inner side of the first liquid cooling plate 10. One end of the first liquid outlet channel along the second direction Y is connected to the first liquid outlet end 12, and the other end is connected to the first liquid inlet first channel on the inner side of the first liquid cooling plate 10. The heat transfer fluid enters the first liquid inlet channel through the first liquid inlet end 11, and then discharges the first liquid cooling plate 10 through the first liquid outlet channel and the first liquid outlet end 12, thereby circulating the heat transfer fluid in the first channel 101 to control the temperature of the battery cell 92.

[0056] Reference Figures 1 to 3 、 Figure 6 、 Figures 8 and 9 as well as Figure 16 The first liquid cooling plate 10 further includes a first convergence plate 13, the first convergence plate 13 extending along the third direction Z, the first convergence plate 13 is arranged at one end of the first liquid cooling plate 10 along the second direction Y, the first liquid inlet end 11 and the first liquid outlet end 12 are spaced apart along the third direction Z on the first convergence plate 13, Figure 4 and Figure 14 The first liquid cooling plate 10 further includes a first blocking member 14 , which is disposed at one end of the first liquid cooling plate 10 away from the first manifold 13 along the second direction Y. The first blocking member 14 blocks the first flow channel 101 .

[0057] Reference Figures 1 to 3 as well as Figures 6 to 10 The first liquid inlet pipe 20 extends along the first direction X, and the first liquid inlet end 11 of the first liquid cooling plate 10 is connected to the first liquid inlet pipe 20 . Specifically, the first liquid inlet ends 11 of the plurality of first liquid cooling plates 10 are respectively connected to the first liquid inlet pipe 20 .

[0058] Reference Figures 1 to 3 as well as Figures 6 to 10 The first liquid outlet pipe 30 extends along the first direction X, and the first liquid outlet end 12 of the first liquid cooling plate 10 is connected to the first liquid outlet pipe 30 . Specifically, the first liquid outlet ends 12 of the plurality of first liquid cooling plates 10 are respectively connected to the first liquid outlet pipe 30 .

[0059] Reference Figures 1 to 15 , the current collector 40 includes a body 41, referring to Figure 10 、 Figure 13 and Figure 15 The body 41 is provided with a liquid supply channel 401 and a liquid return channel 402 extending along the third direction Z, respectively. The liquid supply channel 401 and the liquid return channel 402 are spaced apart along the second direction Y. Figures 1 to 10 The main body 41 is arranged on the same side of the first liquid inlet pipe 20 and the first liquid outlet pipe 30 along the first direction X, the first liquid inlet pipe 20 is connected to the main body 41 and the first liquid inlet pipe 20 is connected to the liquid supply channel 401, the first liquid outlet pipe 30 is connected to the main body 41 and the first liquid outlet pipe 30 is connected to the return liquid channel 402.

[0060] In the existing battery pack, a centralized liquid supply and centralized liquid return are formed for multiple liquid cooling plates in the box through a liquid supply pipe and a liquid return pipe arranged on the box body, so as to ensure the uniformity and stability of the temperature control of the battery cells. Specifically, the liquid supply pipe is connected to the liquid cooling plate through a liquid inlet pipe arranged in the box body to provide heat-conducting fluid to the liquid cooling plate, and the liquid return pipe is connected to the liquid cooling plate through a liquid outlet pipe arranged in the box body to discharge the heat-conducting fluid. Normally, the liquid inlet direction of the liquid inlet pipe (that is, the flow direction of the heat-conducting fluid in the liquid inlet pipe) intersects with the liquid supply direction of the liquid supply pipe (that is, the flow direction of the heat-conducting fluid in the liquid supply pipe), and / or the liquid outlet direction of the liquid outlet pipe (that is, the flow direction of the heat-conducting fluid in the liquid outlet pipe) intersects with the liquid supply direction of the liquid supply pipe (that is, the flow direction of the heat-conducting fluid in the liquid outlet pipe). The flow direction in the liquid outlet pipe) intersects with the return direction of the liquid return pipe (that is, the flow direction of the heat transfer fluid in the return liquid pipe), so it is necessary to set multiple adapters in the box to ensure the connection between the liquid supply pipe and the liquid inlet pipe, and the liquid return pipe and the liquid outlet pipe. The setting of multiple adapters leads to assembly tolerances between the adapter and the liquid inlet pipe and the liquid supply pipe, as well as between the adapter and the liquid outlet pipe and the liquid return pipe, which in turn affects the connection stability and connection sealing between the connector and the liquid inlet pipe and the liquid supply pipe, as well as between the adapter and the liquid outlet pipe and the liquid return pipe, affecting the safety of the battery pack. Moreover, the setting of multiple adapters occupies too much space inside the box, affecting the space utilization of the battery pack.

[0061] In the battery pack 1 provided in the embodiment of the present application, the first liquid cooling plate 10 extends along the second direction Y, and the first liquid inlet end 11 and the first liquid outlet end 12 of the first liquid cooling plate 10 are arranged at the same end of the first liquid cooling plate 10 along the second direction Y, and a first liquid inlet pipe 20 extending along the first direction X and a first liquid outlet pipe 30 extending along the first direction X are provided. The first liquid inlet pipe 20 is connected to the first liquid inlet end 11, and the first liquid outlet pipe 30 is connected to the first liquid outlet end 12. A current collector 40 is provided on the same side of the first liquid inlet pipe 20 and the first liquid outlet pipe 30 along the first direction X, and liquid supply pipes extending along the third direction Z are provided inside the body 41 of the current collector 40. The flow channel 401 and the return flow channel 402 are arranged at intervals along the second direction Y, the first liquid inlet pipe 20 is connected to the body 41 and communicated with the liquid supply flow channel 401, the first liquid outlet pipe 30 is connected to the body 41 and communicated with the return flow channel 402, so that the liquid inlet direction of the first liquid inlet pipe 20 and the liquid outlet direction of the first liquid outlet pipe 30 are changed from the first direction X to the third direction Z. Specifically, the heat transfer fluid enters the first liquid inlet pipe 20 through the liquid supply flow channel 401, so that the flow direction of the heat transfer fluid is changed from the third direction Z to the first direction X, and the heat transfer fluid in the first liquid inlet pipe 20 enters the first liquid outlet pipe 30 through the first liquid inlet end 11. The heat transfer fluid enters the first liquid cold plate 10, and flows along the second direction Y in the first liquid inlet channel of the first flow channel 101 and enters the first liquid outlet channel, so that the flow direction of the heat transfer fluid is changed from the first direction X to the second direction Y, and then enters the first liquid outlet pipe 30 through the first liquid outlet end 12. The heat transfer fluid entering the first liquid outlet pipe 30 flows along the first direction X and enters the return liquid channel 402. The flow direction of the heat transfer fluid in the return liquid channel 402 is changed from the first direction, that is, the liquid inlet direction is changed from the third direction Z to the first direction X, thereby changing the liquid inlet direction of the first liquid inlet pipe 20 and the liquid outlet direction of the first liquid outlet pipe 30 from the first direction X to the third direction Z. Only one current collector 40 is needed to realize the transition of the flow direction of the heat-conducting fluid from the third direction Z to the first direction X, then from the first direction X to the second direction Y, then from the second direction Y to the first direction X, and then from the first direction X to the third direction Z, thereby improving the space utilization inside the box of the battery pack 1. In addition, the first liquid inlet pipe 20 and the first liquid outlet pipe 30 are directly connected to the main body 41, and the assembly tolerance of the first liquid inlet pipe 20 and the first liquid outlet pipe 30 is absorbed by the main body 41, thereby ensuring the connection stability and connection sealing between the main body 41 and the first liquid inlet pipe 20 and the first liquid outlet pipe 30, thereby ensuring the safety of the battery pack 1.

[0062] In some embodiments, reference Figures 1 to 3 as well as Figures 6 to 14 The current collector 40 further includes a first connecting portion 42 and a second connecting portion 43. One end of the first connecting portion 42 along the first direction X is connected to the body 41, and the other end is connected to the first liquid inlet pipe 20. Figure 10 and Figure 14 The first connecting portion 42 is provided with a first branch channel 420 communicating with the liquid supply channel 401. The first liquid inlet pipe 20 is connected to the liquid supply channel 401 through the first branch channel 420. The second connecting portion 43 is connected to the body 41 at one end along the first direction X and to the first liquid outlet pipe 30 at the other end. Figure 10 and Figure 13 The second connecting portion 43 has a second branch channel 430 disposed therein, communicating with the return liquid channel 402. The first liquid outlet pipe 30 communicates with the return liquid channel 402 via the second branch channel 430. The provision of the first connecting portion 42 can absorb assembly tolerances between the main body 41 and the first liquid inlet pipe 20, ensuring a stable and leak-tight connection between the main body 41 and the first liquid inlet pipe 20. The provision of the second connecting portion 43 can absorb assembly tolerances between the main body 41 and the first liquid outlet pipe 30, ensuring a stable and leak-tight connection between the main body 41 and the first liquid outlet pipe 30.

[0063] In some embodiments, the body 41 has a first surface 411 intersecting the third direction Z, as shown in FIG. Figures 12 to 15 In the embodiment shown, the body 41 includes a first surface 411 and a second surface 412 arranged opposite to each other along the third direction Z. Figures 1 to 3 as well as Figures 6 to 12 as well as Figure 14 The first connecting portion 42 and the second connecting portion 43 are spaced apart along the third direction Z, and the orthographic projection of the first connecting portion 42 on the plane where the first surface 411 lies at least partially overlaps with the orthographic projection of the second connecting portion 43 on the plane where the first surface 411 lies. The spaced-apart arrangement of the first connecting portion 42 and the second connecting portion 43 along the third direction Z, with their orthographic projections at least partially overlapping, allows the first liquid inlet pipe 20 and the first liquid outlet pipe 30 to be spaced apart along the third direction Z. This eliminates or minimizes the spacing between the first liquid inlet pipe 20 and the first liquid outlet pipe 30 along the second direction Y, thereby enabling the main body 41 to be directly connected to the first liquid inlet pipe 20 and the first liquid outlet pipe 30 along the first direction X, thereby improving assembly convenience and accuracy.

[0064] In some embodiments, reference Figures 1 to 12 as well as Figures 14 and 15 The first surface 411 of the main body 41 is provided with a protruding portion 44 protruding along the third direction Z. Figures 14 and 15 The protrusion 44 is provided with a third branch channel 440 connected to the liquid supply channel 401 along the third direction Z. Figures 1 to 3 、 Figure 8 、 Figures 11-12 as well as Figure 14 The protruding portion 44 and the second connecting portion 43 are spaced apart along the second direction Y, referring to Figure 3 、 Figures 6 to 8 、 Figures 10 to 12 as well as Figure 14 The first connecting portion 42 includes a connecting section 421, one end of the connecting section 421 along the first direction X is connected to the first liquid inlet pipe 20, and the other end of the connecting section 421 is bent along the second direction Y toward the direction close to the protrusion 44 to form a bent section 422. The connecting section 421 is connected to the protrusion 44 through the bent section 422. The first branch channel 420 is connected to the liquid supply channel 401 through the third branch channel 440. Along the third direction Z, the orthographic projection of the connecting section 421 on the plane where the first surface 411 is located at least partially overlaps with the orthographic projection of the second connecting portion 43 on the plane where the first surface 411 is located. Specifically, Figure 3 、 Figures 6 to 12 as well as Figure 14 In the illustrated embodiment, the orthographic projection of the connecting section 421 on the plane where the first surface 411 is located coincides with the orthographic projection of the second connecting portion 43 on the plane where the first surface 411 is located. The protrusion 44 is arranged on the first surface 411 of the main body 41, and the protrusion 44 forms an extension of the main body 41 along the third direction Z, thereby reducing the space occupied by the collector 40 in the third direction Z and improving the space utilization in the third direction Z. Moreover, since the protrusion 44 and the second connecting portion 43 are arranged at intervals along the second direction Y, the connecting section 421 in the first connecting portion 42 needs to be bent in the direction close to the protrusion 44 to form a bent section 422 to connect with the protrusion 44. While ensuring that the first connecting portion 42 is connected to the liquid supply channel 401, the connecting section 421 in the first connecting portion 42 can be arranged at intervals along the third direction Z with the second connecting portion 43 and at least partially overlap with the orthographic projection on the plane where the first surface 411 is located, so that the main body 41 can be directly connected to the first liquid inlet pipe 20 and the first liquid outlet pipe 30 along the first direction X, thereby improving assembly convenience and assembly accuracy.

[0065] Among them, the method for determining the orthographic projections of the first connecting part 42 and the second connecting part 43 on the plane where the first surface 411 is located is: the light source is set on the side of the first connecting part 42 away from the second connecting part 43 along the third direction Z, and the projection board is set on the side of the second connecting part 43 away from the first connecting part 42 along the third direction Z. The projection board is parallel to the first surface 411, and the light source directly shines on the first connecting part 42 and the second connecting part 43 along the third direction Z, so that the orthographic projections of the first connecting part 42 and the second connecting part 43 on the projection board can be obtained.

[0066] In some embodiments, reference Figure 7The first branch channel 420 in the connecting section 421 has a first axis 423 extending along the first direction X. The second branch channel 430 in the second connecting portion 43 has a second axis 431 extending along the first direction X. The first axis 423 is parallel to the second axis 431. The first liquid inlet pipe 20 has a third axis 21 extending along the first direction X. The first liquid outlet pipe 30 has a fourth axis 31 extending along the first direction X. Figure 7 Along the third direction Z, the distance between the first axis 423 and the second axis 431 is L2, and the distance between the third axis 21 and the fourth axis 31 is L1, where L2 is the same as L1. The spacing L1 between the first axis 423 and the second axis 431 along the third direction Z is the same as the spacing L2 between the third axis 21 and the fourth axis 31 along the third direction Z. This allows the main body 41, through the connecting segment 421 in the first connecting portion 42, to absorb assembly tolerances with the first liquid inlet pipe 20 along the first direction X, thereby ensuring connection stability and assembly accuracy between the first connecting portion 42 and the first liquid inlet pipe 20. Furthermore, the main body 41, through the second connecting portion 43, can absorb assembly tolerances with the first liquid outlet pipe 30 along the first direction X, thereby ensuring connection stability and assembly accuracy between the second connecting portion 43 and the first liquid outlet pipe 30, thereby improving assembly efficiency.

[0067] Here, L2 is the same as L1, which means that the absolute value of the difference between L2 and L1 is between -1 mm and 1 mm, that is, -1 mm ≤ |L2-L1| ≤ 1 mm.

[0068] In some embodiments, reference Figures 1 to 10 The battery pack 1 further includes a second liquid cooling plate 50, a second liquid inlet pipe 60 and a second liquid outlet pipe 70. The second liquid cooling plate 50 extends along the second direction Y. Figures 1 to 5 The second liquid cooling plate 50 and the first liquid cooling plate 10 are spaced apart along the third direction Z to form a double-layer battery pack structure design. The number of the second liquid cooling plates 50 is multiple, and the multiple second liquid cooling plates 50 are spaced apart along the first direction X. A plurality of battery cells 92 are arranged between two adjacent second liquid cooling plates 50 along the first direction X. The battery cells 92 abut against each other along the second liquid cooling plate 50 along the first direction X. Figure 19 The second liquid cooling plate 50 is provided with a second flow channel 501 for the flow of heat transfer fluid. Figure 3 and Figure 19, one end of the second liquid cooling plate 50 along the second direction Y is provided with a second liquid inlet end 51 and a second liquid outlet end 52 respectively connected to the second flow channel 501, that is, the second liquid inlet end 51 and the second liquid outlet end 52 are provided at the same end of the second liquid cooling plate 50 along the second direction Y, the second liquid inlet end 51 and the second liquid outlet end 52 are spaced apart along the third direction Z, the second flow channel 501 includes a second liquid inlet flow channel and a second liquid outlet flow channel spaced apart along the third direction Z, the second liquid inlet flow channel and the second liquid outlet flow channel respectively extend along the second direction Y, and the second liquid inlet flow channel extends along the third direction Z. One end of the second direction Y is connected to the second liquid inlet end 51, and the other end is connected to the second liquid outlet channel on the inner side of the second liquid cooling plate 50. One end of the second liquid outlet channel along the second direction Y is connected to the second liquid outlet end 52, and the other end is connected to the second liquid inlet channel on the inner side of the second liquid cooling plate 50. The heat transfer fluid enters the second liquid inlet channel through the second liquid inlet end 51, and then discharges the second liquid cooling plate 50 through the second liquid outlet channel and the second liquid outlet end 52, thereby circulating the heat transfer fluid in the second channel 501 to control the temperature of the battery cell 92.

[0069] Reference Figures 1 to 3 、 Figures 6 to 9 as well as Figure 18 The second liquid cooling plate 50 further includes a second convergence plate 53, which extends along the third direction Z. The second convergence plate 53 is disposed at one end of the second liquid cooling plate 50 along the second direction Y. The second liquid inlet end 51 and the second liquid outlet end 52 are spaced apart along the third direction Z on the second convergence plate 53. Figure 4 and Figure 18 The second liquid cooling plate 50 further includes a second blocking member 54 , which is disposed at one end of the second liquid cooling plate 50 away from the second manifold 53 along the second direction Y. The second blocking member 54 blocks the second flow channel 501 .

[0070] Reference Figures 1 to 3 as well as Figures 6 to 10The second liquid inlet pipe 60 extends along the first direction X, and the second liquid inlet end 51 of the second liquid cooling plate 50 is in communication with the second liquid inlet pipe 60. Specifically, the second liquid inlet ends 51 of the plurality of second liquid cooling plates 50 are respectively in communication with the second liquid inlet pipe 60. The second liquid outlet pipe 70 extends along the first direction X, and the second liquid outlet end 52 of the second liquid cooling plate 50 is in communication with the second liquid outlet pipe 70. Specifically, the second liquid outlet ends 52 of the plurality of second liquid cooling plates 50 are respectively in communication with the second liquid outlet pipe 70. Along the third direction Z, the first liquid inlet pipe 20, the first liquid outlet pipe 30, the second liquid inlet pipe 60, and the second liquid outlet pipe 70 are all spaced apart. The second liquid inlet pipe 60 is connected to the protrusion 44 and is in communication with the liquid supply channel 401. Specifically, the second liquid inlet pipe 60 is in communication with the liquid supply channel 401 in the body 41 via the third branch channel 440 in the protrusion 44. The second liquid outlet pipe 70 is connected to the body 41 and is in communication with the liquid return channel 402. The second liquid cooling plate 50 is provided and spaced apart from the first liquid cooling plate 10 along the third direction Z, thereby forming a double-layer battery pack structural design, and the second liquid inlet end 51 and the second liquid outlet end 52 of the second liquid cooling plate 50 are provided at the same end of the second liquid cooling plate 50 along the second direction Y, so that the second liquid inlet pipe 60 and the second liquid outlet pipe 70 are located on the same side of the second liquid cooling plate 50, and further, the first liquid inlet pipe 20, the first liquid outlet pipe 30, the second liquid inlet pipe 60 and the second liquid outlet pipe 70 are all spaced apart along the third direction Z and are all located on the same side of the second direction Y, making full use of the space inside the battery pack 1 box in the third direction Z, and reducing the space occupied inside the box in the second direction Y, thereby improving space utilization.

[0071] In some embodiments, reference Figures 1 to 11 The current collector 40 further includes a first connecting tube 45 and a second connecting tube 46, referring to Figures 1 to 10 The second liquid inlet pipe 60 is connected to the body 41 through the first connecting pipe 45. Specifically, the second liquid inlet pipe 60 is connected to the end of the protrusion 44 along the third direction Z away from the body 41 through the first connecting pipe 45, and then connected to the body 41 through the protrusion 44. The second liquid outlet pipe 70 is connected to the body 41 through the second connecting pipe 46. Specifically, the second connecting pipe 46 is connected to the first surface 411 of the body 41 and communicates with the return liquid flow channel 402 in the body 41. Figures 3 to 11 The first connecting pipe 45 includes a first section 451 and a second section 452, and the first section 451 is connected to the second liquid inlet pipe 60 through the second section 452. The second connecting pipe 46 includes a third section 461 and a fourth section 462, and the third section 461 is connected to the second liquid outlet pipe 70 through the fourth section 462.

[0072] The first section 451 and the third section 461 extend along the third direction Z respectively, and the first section 451 and the third section 461 are spaced apart along the second direction Y. One end of the first section 451 along the third direction Z is connected to the main body 41. Specifically, one end of the first section 451 along the third direction Z is connected to the main body 41 through the protrusion 44. The other end of the first section 451 along the third direction Z is bent along the second direction Y toward the direction close to the third section 461 and is connected to the second section 452. One end of the third section 461 along the third direction Z is connected to the main body 41. Specifically, one end of the third section 461 along the third direction Z is connected to the first surface 411 of the main body 41, and the other end is connected to the fourth section 462.

[0073] The second section 452 and the fourth section 462 extend respectively along the first direction X. One end of the second section 452 along the first direction X is connected to the first section 451, and the other end is connected to the second liquid inlet pipe 60. One end of the fourth section 462 along the first direction X is connected to the third section 461, and the other end is connected to the second liquid outlet pipe 70. The second section 452 and the fourth section 462 are spaced apart along the third direction Z. The orthographic projection of the second section 452 on the plane where the first surface 411 of the body 41 is located at least partially overlaps with the orthographic projection of the fourth section 462 on the plane where the first surface 411 is located. The structural design of the end of the first section 451 that is away from the main body 41 along the third direction Z is bent along the second direction Y in the direction close to the third section 461 and connected to the second section 452, so that the second section 452 in the first connecting tube 45 can be spaced apart from the fourth section 462 in the second connecting tube 46 along the third direction Z, and the orthographic projections on the plane where the first surface 411 is located at least partially overlap, thereby making the orthographic projections of the second section 452 on the plane where the first surface 411 of the main body 41, the orthographic projections of the fourth section 462 on the plane where the first surface 411 is located, and the first connecting tube 45 can be spaced apart from the fourth section 462 in the second connecting tube 46 along the third direction Z. The orthographic projection of the connecting section 421 in the portion 42 on the plane where the first surface 411 is located and the orthographic projection of the second connecting portion 43 on the plane where the first surface 411 is located at least partially overlap, so that the main body 41 can be directly connected to the first liquid inlet pipe 20 and the first liquid outlet pipe 30 along the first direction X, thereby improving assembly convenience and assembly accuracy, and the main body 41 is directly connected to the second liquid inlet pipe 60 along the first direction X through the first connecting pipe 45, and is directly connected to the second liquid outlet pipe 70 along the first direction X through the second connecting pipe 46, thereby improving assembly convenience and assembly accuracy.

[0074] In addition, the structural design of the second section 452 of the first connecting tube 45 extending along the first direction X can absorb the assembly tolerance between the second liquid inlet tube 60 along the first direction X. The structural design of the fourth section 462 of the second connecting tube 46 extending along the first direction X can absorb the assembly tolerance between the second liquid outlet tube 70 along the first direction X, thereby ensuring connection stability and connection sealing.

[0075] In addition, the coordinated arrangement of the first connecting tube 45, the second connecting tube 46 and the main body 41 can change the flow direction of the heat-conducting fluid in the second liquid inlet tube 60 and the flow direction of the heat-conducting fluid in the second liquid outlet tube 70 from the first direction X to the third direction Z. Only one current collector 40 is needed to realize the flow direction of the heat-conducting fluid from the third direction Z to the first direction X, then from the first direction X to the second direction Y, then from the second direction Y to the first direction X, and then from the first direction X to the third direction Z. Through one current collector, the flow direction of the heat-conducting fluid in the double-layer battery pack structure can be changed, effectively improving the space utilization inside the box of the battery pack 1.

[0076] Among them, the method for determining the orthographic projections of the second segment 452 and the fourth segment 462 on the plane where the first surface 411 is located is as follows: the light source is set on the side of the second segment 452 away from the fourth segment 462 along the third direction Z, and the projection plate is set on the side of the fourth segment 462 away from the second segment 452 along the third direction Z. The projection plate is parallel to the first surface 411, and the light source directly illuminates the first connecting tube 45 and the second connecting tube 46 along the third direction Z, so that the orthographic projections of the second segment 452 and the fourth segment 462 on the projection plate can be obtained.

[0077] In some embodiments, the first connecting tube 45 is a hose, specifically, the first connecting tube 45 is a bellows. The structural design of the bellows allows the first connecting tube 45 to bend relatively easily, thereby ensuring that the second section 452 and the fourth section 462 are spaced apart along the third direction Z, and the positive projections of the second section 452 and the fourth section 462 on the plane where the first surface 411 is located at least partially overlap, ensuring that the second section 452 extends along the first direction X to stabilize the assembly tolerance between the absorption and the second liquid inlet pipe 60 along the first direction X, thereby ensuring the connection stability and assembly accuracy between the first connecting tube 45 and the second liquid inlet pipe 60.

[0078] In some embodiments, the second connecting tube 46 is a hose, specifically, the second connecting tube 46 is a bellows. The structural design of the bellows allows the second connecting tube 46 to be bent relatively easily, so that the fourth section 462 in the second connecting tube 46 can extend along the first direction X to stably absorb the assembly tolerance between the second connecting tube 46 and the second liquid outlet pipe 70 along the first direction X, and ensure that the fourth section 462 and the second section 452 are spaced apart along the third direction Z and their orthographic projections at least partially overlap, so as to absorb the assembly tolerance between the upper battery pack where the second liquid cooling plate 50 is located and the lower battery pack where the first liquid cooling plate 10 is located along the third direction Z.

[0079] Specific as Figure 7In the illustrated embodiment, the fourth section 462 has a fifth axis 463 extending in the first direction X. Along the third direction Z, the distance between the fifth axis 463 and the first axis 423 of the first branch channel 420 in the connecting section 421 is L6. The second liquid outlet pipe 70 has a sixth axis 71 extending in the first direction X. Along the third direction Z, the distance between the sixth axis 71 and the third axis 21 of the first liquid inlet pipe 20 is L7, with L6 and L7 being the same. The distance L6 between the first axis 423 and the fifth axis 463 along the third direction Z is the same as the distance L7 between the sixth axis 71 and the third axis 21 along the third direction Z. This allows the body 41, through the second connecting pipe 46, to absorb assembly tolerances between the body 41 and the second liquid outlet pipe 70 along the first direction X. This also allows for assembly tolerances between the upper battery pack where the second liquid cooling plate 50 resides and the lower battery pack where the first liquid cooling plate 10 resides along the third direction Z, ensuring connection stability and improving assembly efficiency.

[0080] Here, L6 and L7 are the same, which means that the absolute value of the difference between L6 and L7 is between -1 mm and 1 mm, that is, -1 mm≤|L6-L7|≤1 mm.

[0081] In some embodiments, reference Figures 1 to 11 The battery pack 1 also includes a liquid supply pipe 81 and a liquid return pipe 82. Figure 15 The second surface 412 of the body 41 is provided with a liquid supply end 403 communicating with the liquid supply channel 401 and a liquid return end 404 communicating with the liquid return channel 402. Along the third direction Z, one end of the liquid supply tube 81 is inserted into the liquid supply end 403 and extends into the liquid supply channel 401, while one end of the liquid return tube 82 is inserted into the liquid return end 404 and extends into the liquid return channel 402. The provision of the liquid supply tube 81 and the liquid return tube 82 facilitates the connection of the battery pack 1 with external liquid supply and return lines, improving assembly convenience and efficiency.

[0082] In some embodiments, the distance that the liquid supply pipe 81 extends into the liquid supply channel 401 along the third direction Z is adjustable. Figure 7 The distance that the liquid supply pipe 81 is exposed from the main body 41 along the third direction Z is L4 mm, and L4 is adjustable.

[0083] In some embodiments, the distance that the return liquid pipe 82 extends into the return liquid channel 402 along the third direction Z is adjustable. Figure 7 The distance that the return liquid pipe 82 is exposed from the main body 41 along the third direction Z is L4 mm, and L4 is adjustable.

[0084] Reference Figure 20The battery cell 92 is a cylindrical battery. The battery cell 92 includes a first end 921, a second end 922, and a side wall 923. The side wall 923 surrounds the battery cell 92 along the circumferential direction of the battery cell 92. The first end 921 is provided at one end of the side wall 923 along the third direction Z, and the second end 922 is provided at the other end of the side wall 923 along the third direction Z. A terminal 924 is provided on the first end 921. Figure 7 and Figure 20 The distance between the plane where the end face of the terminal 924 is located, which is away from the first end 921 along the third direction Z, and the plane where the end face of the second end 922 is located is L3 mm, and L4 is adjustable, so that during the assembly process of the battery pack 1, the dimensional tolerance of the dimension L3 of the battery cell 92 along the third direction Z in the box can be absorbed, thereby ensuring the assembly stability of the battery cell 92 in the box of the battery pack 1.

[0085] In some embodiments, reference Figure 5 The liquid supply pipe 81 has a seventh axis 811, and the liquid return pipe 82 has an eighth axis 821. The seventh axis 811 and the eighth axis 821 extend along the third direction Z respectively, and the seventh axis 811 and the eighth axis 821 are spaced apart along the second direction Y. The spacing between the seventh axis 811 and the eighth axis 821 along the second direction Y is L5 mm. The setting of L5 makes the liquid supply pipe 81 and the liquid return pipe 82 independent of each other, thereby making the liquid supply and liquid return of the battery pack 1 independent of each other. When there is tolerance in the production process of the current collector 40, the independent liquid supply pipe 81 and liquid return pipe 82 can absorb the tolerance of the current collector 40 along the second direction Y caused by production, thereby ensuring the stability of liquid supply and liquid return.

[0086] In some embodiments, reference Figures 1 to 11 The battery pack 1 further includes a temperature sensor 90, which is disposed on the body 41 to monitor the temperature in the liquid supply channel 401 and the liquid return channel 402. Specifically, referring to Figures 12 to 15 A mounting hole 413 is formed on a side of the body 41 facing away from the first liquid inlet pipe 20 along the first direction X. There are two mounting holes 413, which are spaced apart along the second direction Y. One mounting hole 413 is connected to the liquid supply channel 401, and the other mounting hole 413 is connected to the liquid return channel 402. The temperature sensor 90 is inserted into the mounting hole 413 to monitor the temperature of the heat transfer fluid in the liquid supply channel 401 and the liquid return channel 402, thereby ensuring the safety of the battery pack 1.

[0087] In some embodiments, the temperature sensor 90 is an NTC (thermistor) sensor.

[0088] In some embodiments, reference Figure 15The protrusion 44 is provided with a core-pulling hole 414 connected to the third branch flow channel 440. The body 41 of the current collector 40 is injection molded. The body 41 is an injection-molded plastic part. The injection molding process requires oblique core pulling. The opening of the core-pulling hole 414 facilitates the core pulling. Figure 11 The core-pulling hole 414 is covered with a plugging cover 91 . After the core-pulling is completed, the plugging cover 91 is laser-welded to the protrusion 44 to ensure the airtightness of the current collector 40 .

[0089] In some embodiments, reference Figures 1 to 5 as well as Figure 7 The battery pack 1 also includes a first tray 15 and a second tray 55. The first tray 15 and the second tray 55 are arranged at intervals along the third direction Z. The first liquid cooling plate 10 is arranged between the first tray 15 and the second tray 55. The second liquid cooling plate 50 is arranged on the side of the second tray 55 away from the first tray 15 along the third direction Z. The arrangement of the first tray 15 and the second tray 55 forms a support and load for the battery cell 92, thereby ensuring the installation stability of the battery cell 92 in the battery pack 1.

[0090] The above is a detailed introduction to the technical solutions provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack having a first direction, a second direction, and a third direction intersecting each other, characterized in that: The battery pack includes: a first liquid cooling plate extending along the second direction, having a first flow channel for a heat-conducting fluid therein, and a first liquid inlet and a first liquid outlet respectively connected to the first flow channel at one end of the first liquid cooling plate along the second direction; a first liquid inlet pipe extending along the first direction, wherein the first liquid inlet end is connected to the first liquid inlet pipe; a first liquid outlet pipe extending along the first direction and spaced apart from the first liquid inlet pipe along the third direction, the first liquid outlet end being in communication with the first liquid outlet pipe; A current collector comprising a body, wherein a liquid supply channel and a liquid return channel are provided inside the body and extend along the third direction respectively, and the liquid supply channel and the liquid return channel are spaced apart from each other along the second direction; Along the first direction, the main body is arranged on the same side of the first liquid inlet pipe and the first liquid outlet pipe, the first liquid inlet pipe is connected to the main body and the first liquid inlet pipe is communicated with the liquid supply channel, and the first liquid outlet pipe is connected to the main body and the first liquid outlet pipe is communicated with the liquid return channel.

2. The battery pack according to claim 1, wherein: The current collector further includes a first connecting portion and a second connecting portion; Along the first direction, one end of the first connecting portion is connected to the body, and the other end is connected to the first liquid inlet pipe; a first branch flow channel connected to the liquid supply channel is provided inside the first connecting portion, and the first liquid inlet pipe is connected to the liquid supply channel through the first branch flow channel; Along the first direction, one end of the second connecting part is connected to the main body, and the other end is connected to the first liquid outlet pipe; a second branch channel connected to the return liquid channel is provided inside the second connecting part, and the first liquid outlet pipe is connected to the return liquid channel through the second branch channel.

3. The battery pack according to claim 2, wherein: The main body has a first surface intersecting with the third direction. Along the third direction, the first connecting portion and the second connecting portion are spaced apart. The orthographic projection of the first connecting portion on the plane where the first surface is located at least partially overlaps with the orthographic projection of the second connecting portion on the plane where the first surface is located.

4. The battery pack according to claim 3, wherein: Along the third direction, a protrusion is provided on the first surface, and a third branch flow channel connected to the liquid supply flow channel is provided inside the protrusion; The protruding portion and the second connecting portion are spaced apart along the second direction; The first connecting portion includes a connecting section, one end of the connecting section along the first direction is connected to the first liquid inlet pipe, and the other end of the connecting section is bent along the second direction toward the protrusion to form a bent section, the connecting section is connected to the protrusion via the bent section, and the first branch channel is connected to the liquid supply channel via the third branch channel; Along the third direction, an orthographic projection of the connecting section on the plane where the first surface is located at least partially overlaps with an orthographic projection of the second connecting portion on the plane where the first surface is located.

5. The battery pack according to claim 4, wherein: Along the first direction, the first branch channel in the connecting section has a first axis, the second branch channel has a second axis, the first liquid inlet pipe has a third axis, and the first liquid outlet pipe has a fourth axis; Along the third direction, a distance between the first axis and the second axis is the same as a distance between the third axis and the fourth axis.

6. The battery pack according to claim 4, wherein: The battery pack further includes a second liquid cooling plate, a second liquid inlet pipe and a second liquid outlet pipe; The second liquid cooling plate is spaced apart from the first liquid cooling plate along the third direction, a second flow channel for heat transfer fluid is provided inside the second liquid cooling plate, and a second liquid inlet end and a second liquid outlet end are provided at one end of the second liquid cooling plate adjacent to the first liquid inlet pipe along the second direction, respectively communicating with the second flow channel; The second liquid inlet pipe and the second liquid outlet pipe extend along the first direction respectively; the first liquid inlet pipe, the first liquid outlet pipe, the second liquid inlet pipe and the second liquid outlet pipe are all arranged at intervals along the third direction, the second liquid inlet end is connected to the second liquid inlet pipe, and the second liquid outlet end is connected to the second liquid outlet pipe; The second liquid inlet pipe is connected to the protruding portion and communicates with the liquid supply channel, and the second liquid outlet pipe is connected to the body and communicates with the liquid return channel.

7. The battery pack according to claim 6, wherein: The current collector further includes a first connecting tube and a second connecting tube; The second liquid inlet pipe is connected to the body through the first connecting pipe, and the second liquid outlet pipe is connected to the body through the second connecting pipe; The first connecting pipe includes a first section and a second section, the first section is connected to the second liquid inlet pipe through the second section, and the second connecting pipe includes a third section and a fourth section, the third section is connected to the second liquid outlet pipe through the fourth section; The first section and the third section extend along the third direction respectively, and the first section and the third section are spaced apart along the second direction; One end of the first section is connected to the body, and the other end is bent along the second direction toward the third section and connected to the second section. One end of the third section is connected to the body, and the other end is connected to the fourth section. Along the third direction, the second segment is spaced apart from the fourth segment, and the orthographic projection of the second segment on the plane where the first surface is located, the orthographic projection of the fourth segment on the plane where the first surface is located, and the orthographic projection of the connecting segment on the plane where the first surface is located at least partially overlap.

8. The battery pack according to claim 1, wherein: The battery pack further includes a liquid supply pipe and a liquid return pipe; Along the third direction, the body has a first surface and a second surface that are opposite to each other, and the second surface is provided with a liquid supply end communicating with the liquid supply channel and a liquid return end communicating with the liquid return channel; The liquid supply channel and the liquid return channel are spaced apart along the second direction; Along the third direction, one end of the liquid supply pipe is inserted into the liquid supply end and extends into the liquid supply channel, and one end of the liquid return pipe is inserted into the liquid return end and extends into the liquid return channel; Along the third direction, the distance that the liquid supply pipe extends into the liquid supply channel is adjustable, and / or the distance that the liquid return pipe extends into the liquid return channel is adjustable.

9. The battery pack according to claim 1, wherein: The battery pack further includes a temperature sensor, which is disposed on the body to monitor the temperature in the liquid supply channel and the liquid return channel.

10. An electrical device, characterized in that: The invention comprises a battery pack according to any one of claims 1 to 9.

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