Liquid cooling plate and battery pack

Abstract

The embodiment of the invention provides a liquid cooling plate and a battery pack. The liquid cooling plate has a first direction, a second direction and a third direction which are intersected pairwise, the liquid cooling plate comprises a liquid cooling plate body, the liquid cooling plate body is provided with a first channel and a second channel which extend along the first direction, and the first channel and the second channel are arranged at an interval along the second direction; the two ends, in the first direction, of the liquid cooling plate body are connected with the plugging pieces, and the plugging pieces are used for plugging the two ends, in the first direction, of the first channel and the second channel; the flow collecting structure is connected to the liquid cooling plate body in the third direction, a flow collecting cavity is formed in the flow collecting structure, the flow collecting cavity communicates with the first channel, and the flow collecting cavity is disconnected from the second channel; and orthographic projections of the current collecting structure and the liquid cooling plate body on a plane perpendicular to the third direction along the third direction are overlapped. Under the condition that the liquid cooling plate is used for the battery pack, the volume utilization rate of the battery pack can be remarkably improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a liquid cooling plate, a thermal management component and a battery pack. Background Art

[0002] With the development of science and technology, battery packs are gradually developing towards advanced technologies with high energy density, high safety, and fast charging. Correspondingly, the number of battery cells in the battery pack is increasing, the heat dissipated by the battery pack during operation is increasing, and the cooling capacity requirements for the battery pack are also increasing. Usually, a liquid cooling plate can be set between the battery cells in the battery pack to achieve the function of heat dissipation. Liquid cooling channels and non-liquid cooling channels are usually provided on the liquid cooling plate, among which the liquid cooling channel is usually used to transmit the cooling medium, while the non-liquid cooling channel can be used to absorb the expansion of the battery cells.

[0003] In the prior art, a current collecting and plugging structure is usually provided at both ends of the liquid cooling plate, and the interior of the current collecting and plugging structure can be connected to the liquid cooling channel to pass the cooling medium into the liquid cooling channel or to guide the cooling medium in the liquid cooling channel out. The current collecting and plugging structure also needs to block the non-liquid cooling channel to prevent the cooling medium from entering the non-liquid cooling channel. Therefore, the internal structure of the current collecting and plugging structure is relatively complex, and its welding operation to the liquid cooling plate is mostly internal welding. The welding quality is difficult to control, and poor welding is easy to occur, and poor welding is not easy to be discovered, which can easily cause the cooling medium to communicate between the liquid cooling channel and the non-liquid cooling channel, affecting the thermal management effect. Summary of the invention

[0004] The present application aims to provide a liquid cooling plate and a battery pack to solve at least one of the problems of the above-mentioned prior art.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a liquid cooling plate, wherein the liquid cooling plate has a first direction, a second direction, and a third direction intersecting in pairs, and the liquid cooling plate comprises:

[0007] A liquid cooling plate body, the liquid cooling plate body having a first channel and a second channel both extending along the first direction, the first channel and the second channel being spaced apart along the second direction;

[0008] A blocking member, both ends of the liquid cooling plate body along the first direction are connected to the blocking member, and the blocking member is used to block both ends of the first channel and the second channel along the first direction;

[0009] and a current collecting structure, wherein the current collecting structure is connected to the liquid cooling plate body along the third direction, a current collecting cavity is provided in the current collecting structure, the current collecting cavity is communicated with the first channel, and the current collecting cavity is disconnected from the second channel;

[0010] The current collecting structure overlaps with the orthographic projection of the liquid cooling plate body along the third direction on a plane perpendicular to the third direction.

[0011] In a second aspect, the present application further discloses a battery pack, the battery pack comprising: a box body, a plurality of battery cells and a liquid cooling plate as described in any one of the above items; wherein,

[0012] A plurality of the battery cells and a plurality of the liquid cooling plates are arranged in the box;

[0013] The plurality of liquid cooling plates are arranged at intervals along the third direction;

[0014] At least one battery cell is arranged between two adjacent liquid cooling plates.

[0015] In the embodiment of the present application, the blocking member is connected to both ends of the liquid cooling plate body along the first direction to block the first channel and the second channel. The current collecting structure is connected to the liquid cooling plate body along the third direction, and the current collecting cavity in the current collecting structure is connected to the first channel. The current collecting structure can be used to pass the cooling medium into the first channel to take away the heat, and to guide the cooling medium in the first channel out, while the second channel is disconnected from the first channel, and the cooling medium can be removed to reduce the weight of the liquid cooling plate, thereby improving the weight energy density of the battery pack. By separately arranging the blocking member and the current collecting structure, the blocking member or the current collecting structure can be welded to the liquid cooling plate body from the outside, and the welding quality is easier to control and poor welding is less likely to occur. Even if leakage occurs due to poor welding, it can be discovered in time, avoiding the cooling medium from being connected between the first channel and the second channel, affecting the weight energy density of the battery pack and the stability of thermal management. At the same time, since the blocking member and the current collecting structure are separately provided, the current collecting structure overlaps with the orthographic projection of the liquid cooling plate body along the third direction on a plane perpendicular to the third direction, which can also reduce the space occupied by the current collecting structure in the first direction and shorten the overall length of the liquid cooling plate in the first direction. In this way, when the liquid cooling plate is used in a battery pack, the volume utilization rate of the battery pack can be significantly improved.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a structural schematic diagram of a liquid cooling plate described in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 Schematic diagram of the exploded structure of the liquid cooling plate shown;

[0020] Figure 3 yes Figure 1 One of the cross-sectional views of the liquid cooling plate shown;

[0021] Figure 4 yes Figure 1 A second cross-sectional view of the liquid cooling plate;

[0022] Figure 5 yes Figure 4 A partial enlarged schematic diagram of the liquid cooling plate shown;

[0023] Figure 6 This is a structural schematic diagram of a liquid cooling plate body at a certain angle described in an embodiment of the present application;

[0024] Figure 7 yes Figure 6 A partial enlarged schematic diagram of the liquid cooling plate body shown;

[0025] Figure 8 This is a structural schematic diagram of another angle of a liquid cooling plate body described in an embodiment of the present application;

[0026] Fig. 9 It is a structural schematic diagram of a connector of a first current collecting structure described in an embodiment of the present application;

[0027] Fig.10 yes Fig. 9 A schematic cross-sectional view of the connector shown;

[0028] Fig.11 It is a structural schematic diagram of a fastening member of a first current collecting structure described in an embodiment of the present application;

[0029] Fig.12 yes Fig.11 A schematic cross-sectional view of the fastening member shown;

[0030] Fig.13 It is a structural schematic diagram of a plug-in connector of a second current collecting structure described in an embodiment of the present application;

[0031] Fig.14 yes Fig.13 A schematic cross-sectional view of the connector shown;

[0032] Fig.15 is a structural schematic diagram of a fastening member of a second current collecting structure described in an embodiment of the present application;

[0033] Fig.16 yes Fig.11 A schematic cross-sectional view of the fastening member shown;

[0034] Fig.17 is a structural schematic diagram of a blocking member described in an embodiment of the present application;

[0035] Fig.18 It is a schematic diagram of the structure of a battery pack described in an embodiment of the present application.

[0036] Figure numerals: 100-liquid cooling plate, 1-liquid cooling plate body, 11-first channel, 111-connecting hole, 112-water inlet hole, 113-water outlet hole, 12-second channel, 13-first surface, 14-second surface, 15-through hole, 151-first through hole, 152-second through hole, 2-blocking member, 21-blocking member body, 22-flanging portion, 3-current collecting structure, 30-current collecting cavity, 31-first current collecting structure, 311-connecting member, 3111-first tube body, 3112-connecting portion, 3113-sinking portion, 3114-first connecting portion, 312-fastening member, 3123-second connecting portion, 32-second current collecting structure, 20-box body, 21-box cover, 30-battery cell, x-first direction, z-second direction, y-third direction. DETAILED DESCRIPTION

[0037] Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0039] In the description of the present invention, it is to 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”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Reference Figures 1 to 17 , shows a schematic diagram of the structure of a liquid cooling plate according to an embodiment of the present application. Figures 1 to 5As shown, the liquid cooling plate has a first direction x, a second direction z and a third direction y that intersect each other. The liquid cooling plate may specifically include: a liquid cooling plate body 1, the liquid cooling plate body 1 has a first channel 11 and a second channel 12 both extending along the first direction x, the first channel 11 and the second channel 12 are arranged at intervals along the second direction z, the first channel 11 can be used for liquid cooling medium to flow through to take away heat and achieve a heat dissipation effect, and the second channel 12 can be an independent sealed channel, which is interspersed between the first channels 11 to absorb the expansion of the battery cell. A sealing member 2 is connected to both ends of the liquid cooling plate body 1 along the first direction x, and the sealing member 2 can be used to seal the first channel 11 and the second channel 12 at both ends along the first direction x; and a collecting structure 3, the collecting structure 3 is connected to the liquid cooling plate body 1 along the third direction y, and a collecting cavity 30 is arranged in the collecting structure 3, the collecting cavity 30 is connected to the first channel 11, and the collecting cavity 30 is disconnected from the second channel 12; wherein, the collecting structure 3 overlaps with the orthographic projection of the liquid cooling plate body 1 along the third direction y on a plane perpendicular to the third direction y.

[0043] In the embodiment of the present application, the plugging member 2 is connected to both ends of the liquid cooling plate body 1 along the first direction x to block the first channel 11 and the second channel 12. The collecting structure 3 is connected to the liquid cooling plate body 1 along the third direction y, and the collecting cavity 30 in the collecting structure 3 is connected to the first channel 11. The collecting structure 3 can be used to pass the cooling medium into the first channel 11 to take away the heat and to guide the cooling medium in the first channel 11 out, while the second channel 12 is disconnected from the collecting cavity 30. It can be understood that the second channel 12 is also opened with the first channel 11. At this time, the second channel 12 can not pass the cooling medium, thereby improving the weight energy density of the battery pack. By setting the plugging member 2 and the collecting structure 3 separately, the plugging member 2 or the collecting structure 3 can be welded to the liquid cooling plate body 1 from the outside, and the welding quality is difficult to control and poor welding is not easy to occur. Even if leakage occurs due to poor welding, it can be discovered in time, avoiding the cooling medium from being connected between the first channel 11 and the second channel 12, thereby improving the thermal management effect of the liquid cooling plate. Moreover, since the orthographic projection of the current collecting structure 3 and the liquid cooling plate body 1 along the third direction y on the plane perpendicular to the third direction y overlaps, the space occupied by the current collecting structure 3 in the first direction x can be reduced, and the overall length of the liquid cooling plate 100 in the first direction x can be shortened. In this way, when the liquid cooling plate 1 is used for a battery pack, the volume utilization rate of the battery pack can be significantly improved.

[0044] In a specific application, the liquid cooling plate 100 can be used for Fig.18 Specifically, the liquid cooling plate 100 is placed between the battery cells 30 to dissipate heat from the battery cells 30. Figure 1 and Figure 2As shown, the number of the collecting structures 3 on the liquid cooling plate 100 is usually two, that is, the collecting structures 3 may include a first collecting structure 31 and a second collecting structure 32. The first collecting structure 31 may be used to pass the cooling medium into the first channel 11 of the liquid cooling plate body 1, and the second collecting structure 32 may be used to guide the cooling medium out of the liquid cooling plate body 1.

[0045] In some optional embodiments of the present application, the orthographic projection of the liquid cooling plate body 1 along the third direction y on a plane perpendicular to the third direction y is a first orthographic projection, and the orthographic projection of the current collecting structure 3 along the third direction y on a plane perpendicular to the third direction y is a second orthographic projection, and the first orthographic projection completely covers the second orthographic projection. In this way, the current collecting structure 3 can completely share the space of the liquid cooling plate body 1 in the first direction x, avoiding the setting of the current collecting structure 3 to increase the overall length of the liquid cooling plate 100 along the first direction x. Thereby, it is beneficial to improve the volume utilization of the battery pack.

[0046] like Figure 2 As shown, the liquid cooling plate body 1 is provided with a through hole 15 penetrating along the third direction y, and the through hole 15 is communicated with the second channel 12; the current collecting structure 3 is at least partially embedded in the through hole 15 along the third direction y, so as to connect the current collecting structure 3 to the liquid cooling plate body 1. In practical applications, since the second channel 12 is a non-medium flow channel, by setting the through hole 15 connected to the current collecting structure 3 in the second channel 12, the defect of liquid leakage can be avoided, and the structure of the liquid cooling plate body 1 can be simplified.

[0047] In practical applications, after the current collecting structure 3 is embedded in the through hole 15 , the current collecting structure 3 may also be welded to the liquid cooling plate body 1 to achieve a reliable connection between the current collecting structure 3 and the liquid cooling plate body 1 .

[0048] like Figure 6 , Figure 7 As shown, there are multiple first channels 11, and the multiple first channels 11 are arranged at intervals along the second direction z; the liquid cooling plate body 1 may include two side walls arranged in opposite directions along the third direction y, the first channel 11 and the second channel 12 are located between the two side walls, and at least one side wall is provided with a connecting hole 111, the connecting hole 111 is connected to the first channel 11, and the connecting holes 111 of two adjacent first channels 11 are connected so that the two adjacent first channels 11 are connected in series, so that the cooling medium can travel a longer distance on the liquid cooling plate, thereby improving the cooling efficiency.

[0049] In a specific application, when two first channels 11 adjacent to each other along the second direction z need to be connected, the collecting structure 3 can be connected to the side wall of the liquid cooling plate body 1, and the liquid cooling plate can also include a connecting portion 3112 respectively connected to the connecting holes 111 on the two first channels 11, so that the two first channels 11 can be connected through the connecting portion 3112. It can be understood that a connecting flow channel is opened in the connecting portion 3112, which connects the two first channels 11.

[0050] In the embodiment of the present application, the number of the current collecting structures 3 is at least two, for example, Figure 1 As shown, the current collecting structure 3 at least includes a first current collecting structure 31 and a second current collecting structure 32. Figure 8 As shown, the liquid cooling plate body 1 may include two side walls arranged in opposite directions along a third direction y, and a water inlet hole 112 and a water outlet hole 113 are provided on the side walls, and the water inlet hole 112 and the water outlet hole 113 are respectively connected to the first channel 11; the collecting cavity 30 of at least one collecting structure 3 (for example, the first collecting structure 31) is connected to the water inlet hole 112, so that the liquid cooling medium is introduced into the first channel 11 through the water inlet hole 112, and the collecting cavity 30 of at least one collecting structure 3 (for example, the second collecting structure 32) is connected to the water outlet hole 113, so that the cooling medium in the first channel 11 is discharged to the collecting structure 3 through the water outlet hole 113, and discharged to the outside of the liquid cooling plate 100 through the collecting structure 3.

[0051] In practical applications, such as Figure 2 As shown, when the current collecting structure 3 may include a first current collecting structure 31 and a second current collecting structure 32, the through hole 15 may correspondingly include a first through hole 151 and a second through hole 152, wherein the first current collecting structure 31 may be embedded in the first through hole 151, and the second current collecting structure 32 may be embedded in the second through hole 152.

[0052] In some embodiments, a water inlet hole 112 is formed on one side wall of a liquid cooling plate body 1, and a water outlet hole 113 is formed on the other side wall, so that the water inlet hole 112 and the water outlet hole 113 are respectively located on both sides of the liquid cooling plate body 1 along the third direction y. In this way, when multiple liquid cooling plates are arranged along the third direction y, they can be conveniently connected in sequence with the water inlet hole 112 and the water outlet hole 113 through the collecting structure 3.

[0053] In the embodiment of the present application, the current collecting structure 3 may specifically include: a plug-in component 311 and a fastening component 312. Figure 2 As shown, the first current collecting structure 31 may include a plug-in component 311 and a buckle component 312 , and the second current collecting structure 32 may include a plug-in component 311 and a buckle component 312 .

[0054] like Figure 5As shown, the connector 311 and the fastener 312 are arranged along the third direction y and are both connected to the liquid cooling plate body 1 . The connector 311 and the fastener 312 enclose a manifold 30 , and the manifold 30 can be communicated with the first channel 11 .

[0055] Optionally, the connector 311 and the fastener 312 are an integrally formed structure, so that the integrally formed connector 311 and the fastener 312 can be directly assembled to the liquid cooling plate body 1, and the installation process is relatively simple. Alternatively, the connector 311 and the fastener 312 are split structures, that is, the connector 311 and the fastener 312 are processed separately, and then the connector 311 and the fastener 312 are assembled and then assembled to the liquid cooling plate body 1. In the case where the connector 311 and the fastener 312 are split structures, the structures of the connector 311 and the fastener 312 can be relatively simple, and correspondingly, the processing technology is also relatively simple.

[0056] like Figures 9 to 12 As shown, the liquid cooling plate 100 may further include a connecting portion 3112 , which is connected to the manifold 30 , and the connecting portion 3112 may cover the connecting holes 111 of two adjacent first channels 11 to achieve the connection between the two adjacent first channels 11 .

[0057] like Fig. 9 and Fig.10 As shown, the connector 311 is further provided with a first connecting portion 3114, and the first connecting portion 3114 is respectively connected to the connecting portion 3112 and the outer side of the liquid cooling plate body 1, so as to connect the connecting portion 3112 to the liquid cooling plate body 1. In other embodiments, as Fig.11 and Fig.12 As shown, the fastener 312 is further provided with a second connecting portion 3123 , which is respectively connected to the connecting portion 3112 and the outer side of the liquid cooling plate body 1 to connect the connecting portion 3112 on the fastener 312 to the liquid cooling plate body 1 .

[0058] Specifically, the first connection portion 3114 or the second connection portion 3123 may be fixed to the liquid cooling plate body 1 by welding.

[0059] In some optional embodiments of the present application, the connecting portion 3112 is independently provided from the current collecting structure 3 to simplify the structure of the current collecting structure 3. Alternatively, the connecting portion 3112 is integrally formed with the current collecting structure 3 to reduce the number of parts in the liquid cooling plate 100 and reduce the manufacturing cost; or, the connecting portion 3112, the first connecting portion 3114 and the plug connector 311 are integrally formed; or the connecting portion 3112, the second connecting portion 3123 and the fastening member 312 are integrally formed. The embodiment of the present application does not specifically limit the arrangement of the connecting portion 3112.

[0060] In some embodiments, the connecting portion 3112 is a tubular structure, and a connecting flow channel is opened inside to connect the two first channels 11; in other embodiments, a groove is provided on the side of the connecting portion 3112 facing the liquid cooling plate body 1, and the connecting portion 3112 is connected to the liquid cooling plate body 1 to form a connecting flow channel. In this way, the outer wall of the liquid cooling plate body 1 can be used to form the flow channel wall of the connecting flow channel, thereby further reducing the weight of the liquid cooling plate, improving the energy density of the battery pack, and avoiding the operation of separately setting the connecting portion 3112, so as to reduce the number of components in the liquid cooling plate 100.

[0061] In another optional embodiment of the present application, the connecting part 3112 can also be formed independently, that is, an independent connecting part 3112 is set in the collecting structure 3. At this time, the connecting part 3112 can be assembled independently, with lower assembly difficulty and better connection reliability, so that the sealing performance of the connecting part 3112 is better and the risk of leakage is reduced.

[0062] like Fig. 9 As shown, the connector 311 is also provided with a first tube 3111 and a sinking portion 3113, the sinking portion 3113 is connected to the outer periphery of one end of the first tube 3111 of the connector 311, the first tube 3111 and the sinking portion 3113 are inserted into the through hole 15 from one side wall of the liquid cooling plate body 1, and the sinking portion 3113 is connected to the other side wall of the liquid cooling plate body 1, and the sinking portion 3113 is welded and fixed to the liquid cooling plate body 1, so as to weld the connector 311 to the liquid cooling plate body 1. In practical applications, an outward-turning portion can also be provided outside the first tube 3111, and the outward-turning portion can serve as a guide structure for the subsequent plug-in of the first tube 3111, making assembly easier, and at the same time playing a role in absorbing manufacturing tolerances, thereby improving product manufacturing yield.

[0063] In a specific application, since the first tube body 3111 and the sinker 3113 are inserted into the through hole 15 from one of the side walls of the liquid cooling plate body 1, and the sinker 3113 is connected to the other side wall of the liquid cooling plate body 1, specifically, the sinker 3113 is an L-shaped structure, one end of the sinker 3113 is connected to the first tube body 3111, and the other end is spaced apart from the first tube body 3111 in the radial direction of the first tube body to form a groove, the sinker 3113 can be connected to both side walls of the liquid cooling plate 100, and welding operations can be performed on the outside of the liquid cooling plate 100, and welding operations can be performed at the corresponding grooves on the sinker 3113, which can greatly improve the convenience of welding. In this way, it is convenient to perform welding operations and to check welding defects, avoiding risks such as cold welding and leaking welding, which is conducive to improving the overall welding quality.

[0064] In the embodiment of the present application, a through hole 15 is provided on the liquid cooling plate body 1, which passes through along the third direction y. The liquid cooling plate body 1 includes two side walls which are arranged in opposite directions along the third direction y. The plug-in connector 311 is welded to one of the side walls and extends from the through hole 15 to the other side wall. The fastener 312 is welded to the outside of the other side wall. Since the plug-in connector 311 and the fastener 312 can be welded separately from the outside of the two side walls of the liquid cooling plate body 1, it is not only convenient to perform welding operations, but also convenient to inspect welding defects, avoid risks such as cold welding and leaking welding, and is conducive to improving the overall welding quality.

[0065] like Fig.17 As shown, the plugging member 2 may specifically include: a plugging member body 21 and a flange portion 22, wherein the flange portion 22 is connected to the outer periphery of the plugging member body 21, and the plugging member body 21 is covered at the end of the liquid cooling plate body 1 along the first direction x to block the first channel 11 and the second channel 12, thereby achieving end sealing of the first channel 11 and the second channel 12. The flange portion 22 is sleeved at the end of the liquid cooling plate body 1 along the first direction x, and the flange portion 22 is welded to the liquid cooling plate body 1 to achieve a welding connection between the plugging member 2 and the liquid cooling plate body 1.

[0066] In specific applications, since the flange portion 22 is sleeved on the end of the liquid cooling plate body 1, it can not only increase the contact area with the liquid cooling plate body 1, but also facilitate the welding connection between the flange portion 22 and the liquid cooling plate body 1 outside the liquid cooling plate body 1, thereby improving the overall structural strength.

[0067] In some optional embodiments of the present application, the plugging member 2 is welded to the liquid cooling plate body 1 to avoid the operation of separately processing the plugging member 2, thereby reducing the number of parts in the liquid cooling plate 100. Alternatively, the plugging member 2 and the liquid cooling plate body 1 are an integrally formed structure, for example, an integrally hot-pressed structure, etc., to avoid the operation of additionally connecting the plugging member 2 and the liquid cooling plate body 1, thereby simplifying the processing technology of the liquid cooling plate 100.

[0068] In summary, the liquid cooling plate of the embodiment of the present application can at least include the following advantages:

[0069] In the embodiment of the present application, the plugging member is connected to both ends of the liquid cooling plate body along the first direction to block the first channel and the second channel. The collecting structure is connected to the liquid cooling plate body along the third direction, and the collecting cavity in the collecting structure is connected to the first channel. The collecting structure can be used to pass the cooling medium into the first channel to take away the heat and to guide the cooling medium in the first channel out. By setting the plugging member and the collecting structure separately, the plugging member or the collecting structure can be welded to the liquid cooling plate body from the outside, and the welding quality is difficult to control, and poor welding is not easy to occur. Even if leakage occurs due to poor welding, it can be discovered in time, avoiding the connection of the cooling medium between the first channel and the second channel, and improving the thermal management effect of the liquid cooling plate. Moreover, since the positive projection of the collecting structure and the liquid cooling plate body along the first direction on the plane perpendicular to the first direction overlap, the space occupied by the collecting structure in the first direction can be reduced, and the overall length of the liquid cooling plate in the first direction can be shortened. In this way, when the liquid cooling plate is used for a battery pack, the volume utilization rate of the battery pack can be significantly improved.

[0070] Reference Fig.18 , shows a schematic diagram of the structure of a battery pack according to an embodiment of the present application, such as Fig.18 As shown, the battery pack may specifically include: a box body 20, a plurality of battery cells 30 and any of the above-mentioned liquid cooling plates 100; wherein, the plurality of battery cells 30 and the plurality of liquid cooling plates 100 are arranged in the box body 20; the plurality of liquid cooling plates 100 are arranged at intervals along the third direction y; at least one battery cell 30 is arranged between two adjacent liquid cooling plates 100, and the liquid cooling plate 100 can be used to dissipate heat from the battery cells 30.

[0071] In the embodiment of the present application, since the collector structure 3 of the liquid cooling plate 100 overlaps with the orthographic projection of the liquid cooling plate body 1 along the first direction x on a plane perpendicular to the first direction x, the space occupied by the collector structure 3 in the first direction x can be reduced, and the overall length of the liquid cooling plate 100 in the first direction x can be shortened. In this way, the volume utilization of the battery pack can be significantly improved.

[0072] Alternatively, if Figure 5 As shown, the liquid cooling plate 100 may specifically include a liquid cooling plate body 1 and a manifold structure 3; wherein a manifold cavity 30 is provided in the manifold structure 3, and at least a portion of the manifold cavity 30 is arranged in a stepped shape, so as to introduce or export the cooling medium into or out of the liquid cooling plate body 1 through the stepped structure. Specifically, in a manifold structure 3, a liquid inlet channel or a liquid outlet channel is formed on the fastener 312, and the liquid inlet channel and the liquid outlet channel may be connected with the manifold cavity 30 arranged in a stepped shape to realize the function of liquid inlet and outlet.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A liquid cooling plate, the liquid cooling plate having a first direction (x), a second direction (z) and a third direction (y) intersecting each other, characterized in that: The liquid cooling plate comprises: A liquid cooling plate body (1), the liquid cooling plate body (1) comprising a first channel (11) and a second channel (12) both extending along the first direction (x), the first channel (11) and the second channel (12) being arranged at intervals along the second direction (z); a blocking member (2), wherein both ends of the liquid cooling plate body (1) along the first direction (x) are connected to the blocking member (2), and the blocking member (2) is used to block both ends of the first channel (11) and the second channel (12) along the first direction (x); and a current collecting structure (3), the current collecting structure (3) being connected to the liquid cooling plate body (1) along the third direction (y), a current collecting cavity (30) being arranged in the current collecting structure (3), the current collecting cavity (30) being in communication with the first channel (11), and the current collecting cavity (30) being disconnected from the second channel (12); The current collecting structure (3) overlaps with the orthographic projection of the liquid cooling plate body (1) along the third direction (y) on a plane perpendicular to the third direction (y).

2. The liquid cooling plate according to claim 1, characterized in that: The orthographic projection of the liquid cooling plate body (1) along the third direction (y) on a plane perpendicular to the third direction (y) is a first orthographic projection, and the orthographic projection of the current collecting structure (3) along the third direction (y) on a plane perpendicular to the third direction (y) is a second orthographic projection, and the first orthographic projection completely covers the second orthographic projection.

3. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate body (1) is provided with a through hole (15) penetrating along the third direction (y), and the through hole (15) is connected to the second channel (12); The current collecting structure (3) is at least partially embedded in the through hole (15) along the third direction (y).

4. The liquid cooling plate according to claim 1, characterized in that: The number of the first channels (11) is plural, and the plurality of the first channels (11) are arranged at intervals along the second direction (z); The liquid cooling plate body (1) comprises two side walls arranged in opposite directions along the third direction (y), the first channel (11) and the second channel (12) are located between the two side walls, at least one of the side walls is provided with a connecting hole (111), the connecting hole (111) is connected to the first channel (11), and the connecting holes (111) of two adjacent first channels (11) are connected so that the two adjacent first channels (11) are connected in series.

5. The liquid cooling plate according to claim 1, characterized in that: The number of the current collecting structures (3) is at least two, wherein: The liquid cooling plate body (1) comprises two side walls arranged in opposite directions along the third direction (y), the side walls being provided with a water inlet hole (112) and a water outlet hole (113), the water inlet hole and the water outlet hole being respectively connected to the first channel (11); The collecting cavity (30) of at least one of the collecting structures (30) is in communication with the water inlet hole (112), and the collecting cavity (30) of at least one of the collecting structures (30) is in communication with the water outlet hole (113).

6. The liquid cooling plate according to claim 1, characterized in that: The current collecting structure (3) comprises: a plug-in component (311) and a buckle component (312), wherein the plug-in component (311) and the buckle component (312) are arranged along the third direction (y) and are both connected to the liquid cooling plate body (1), and the plug-in component (311) and the buckle component (312) enclose the current collecting cavity (30); wherein: The plug-in connector (311) and the buckle connector (312) are of an integrally formed structure or a separate structure.

7. The liquid cooling plate according to claim 1 or 4, characterized in that: The number of the first channels (11) is multiple, and the multiple first channels (11) are arranged at intervals along the second direction (z); the liquid cooling plate also includes a connecting portion (3122), and the connecting portion (3122) connects two adjacent first channels (11).

8. The liquid cooling plate according to claim 7, characterized in that: The current collecting structure (3) is further provided with a first connecting portion (3114), and the first connecting portion (3114) is respectively connected to the connecting portion (3122) and the outer side of the liquid cooling plate body (1); And / or, the current collecting structure (3) is further provided with a second connecting portion (3123), and the second connecting portion (3123) is respectively connected to the connecting portion (3122) and the outer side of the liquid cooling plate body (1).

9. The liquid cooling plate according to claim 6, characterized in that: The liquid cooling plate body (1) comprises two side walls arranged in opposite directions along the third direction (y), and the side walls are provided with through holes (15) penetrating along the third direction (y); The plug-in component (311) comprises a first tube body (3111) and a sinking portion (3113), wherein the sinking portion (3113) is connected to the outer periphery of one end of the first tube body (3111), the first tube body (3111) is inserted into the through hole (15) of one of the side walls of the liquid cooling plate body (1), and the sinking portion (3113) is welded and fixed to the other side wall of the liquid cooling plate body (1), and the fastening component (312) is welded and fixed to the other side wall.

10. The liquid cooling plate according to claim 1, characterized in that: The blocking member (2) comprises: a blocking member body (21) and a flange portion (22) connected to the outer periphery of the blocking member body (21); the blocking member body (21) is arranged to cover the end of the liquid cooling plate body (1) along the first direction (x) to block the first channel (11) and the second channel (12); The flange portion (22) is sleeved on the end of the liquid cooling plate body (1) along the first direction (x), and the flange portion (22) is welded and fixed to the liquid cooling plate body (1); or the sealing member (2) and the liquid cooling plate body (1) are integrally formed.

11. A battery pack, characterized in that: The battery pack comprises: a box body (20), a plurality of battery cells (30) and a liquid cooling plate according to any one of claims 1 to 10; wherein: A plurality of battery cells (30) and a plurality of liquid cooling plates are arranged in the box body (20); A plurality of the liquid cooling plates (100) are arranged at intervals along a third direction (y); At least one battery cell (30) is arranged between two adjacent liquid cooling plates (100).

12. The battery pack according to claim 11, characterized in that: The liquid cooling plate comprises a liquid cooling plate body (1) and a current collecting structure (3); wherein: A collecting cavity (30) is arranged in the collecting structure (3), and at least a part of the collecting cavity (30) is arranged in a stepped shape, so that the cooling medium can be introduced into or guided out of the liquid cooling plate body (1) through the structure arranged in the stepped shape.

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