Liquid cooling device and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a liquid cooling device and a battery pack, the liquid cooling device comprises a liquid cooling plate, a connecting mechanism and a connecting pipe, the liquid cooling plate is connected with a battery module, and a cooling cavity for cooling liquid to flow is formed in the liquid cooling plate; the connecting mechanism comprises an upper chuck, the upper chuck is detachably connected with the liquid cooling plate, an access hole is formed in the upper chuck, and the interior of the upper chuck communicates with the cooling cavity through the access hole; the upper clamping head is detachably connected with the connecting pipe, the interior of the connecting pipe is communicated with the interior of the upper clamping head, and the connecting pipe and the upper clamping head are coaxially arranged. Thus, cooling liquid can be conveyed to the liquid cooling plate through the upper chuck, the structure is more compact, installation and maintenance are convenient, and the overhaul difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to ship equipment technical field especially relates to a liquid cooling device and battery pack. BACKGROUND

[0002] The ship is a kind of water transport tool, along with the rapid development of shipping industry, new energy ship gradually becomes the development direction of shipping industry, and it is internally provided with marine battery pack as core power source to realize energy saving and emission reduction.

[0003] With the continuous improvement of the battery energy density of marine battery pack and the continuous acceleration of charge and discharge rate, the heat generation of marine battery pack also gradually increases, liquid cooling device needs to be used to carry out liquid cooling heat dissipation to battery pack to avoid heat accumulation.Liquid cooling device includes liquid cooling plate and liquid cooling pipe network, and liquid cooling pipe network includes three-stage liquid cooling pipe, and first-stage pipe is battery stack main pipe, and second-stage pipe includes multiple vertical pipes, and third-stage pipe includes small pipe connected with battery pack, and small pipe is connected with liquid cooling plate through right-angle water nozzle, so that cooling liquid circulates and flows in pipe and liquid cooling plate.

[0004] However, in the long-term rocking and vibration environment of ship, the connecting point of right-angle water nozzle and liquid cooling plate is prone to stress concentration and fatigue fracture, since three-stage liquid cooling pipe structure is complex, volume and weight are large, and more space is occupied, more pipes are usually removed during installation and maintenance, and traditional PVC pipe is difficult to meet the fire resistance requirement of ship classification society, so there are problems of poor safety performance of liquid cooling device, complex structure and difficult maintenance. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of liquid cooling device and battery pack to solve the problems of poor safety performance of liquid cooling device, complex structure and difficult maintenance.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] First, a kind of liquid cooling device, including: liquid cooling plate, the liquid cooling plate is connected with battery module, and cooling cavity for cooling liquid flow is set up in the liquid cooling plate;Connecting mechanism, the connecting mechanism includes upper chuck, the upper chuck is detachably connected with the liquid cooling plate, the upper chuck is set up with inlet and outlet hole, and the upper chuck interior is communicated with the cooling cavity by the inlet and outlet hole;Connecting pipe, the upper chuck is detachably connected with the connecting pipe, the connecting pipe interior is communicated with the upper chuck interior, and the connecting pipe is coaxially arranged with the upper chuck.

[0008] As preferred, the connecting mechanism further comprises a lower collet in communication with the upper collet, the lower collet is detachably connected with the upper collet, the lower collet is coaxially arranged with the upper collet, and the ends of the upper collet and the lower collet away from each other are located on both sides of the liquid cooling plate in the first direction; the first direction is the thickness direction of the liquid cooling plate.

[0009] As preferred, the upper collet is connected with a mounting portion, the access hole is arranged on the mounting portion, and the lower collet is provided with a mounting groove corresponding to the position of the mounting portion, so that the mounting portion is threadedly connected with the lower collet.

[0010] As preferred, a plurality of access holes are arranged, and the plurality of access holes are circumferentially spaced apart on the side wall of the mounting portion.

[0011] As preferred, the connecting mechanism further comprises a sealing gasket, the sealing gasket is arranged between the upper collet and the liquid cooling plate; and / or, the sealing gasket is arranged between the lower collet and the liquid cooling plate.

[0012] As preferred, the liquid cooling plate is provided with a water inlet and a water outlet, the positions of the water inlet and the water outlet correspond to the connecting mechanism, and the water inlet and the water outlet are arranged on the same side of the liquid cooling plate.

[0013] In a second aspect, a battery pack comprises a battery module, a box body and a liquid cooling device as described above, and the battery module is arranged inside the box body.

[0014] As preferred, a plurality of battery modules are arranged, and the plurality of battery modules are arranged in the first direction, the battery modules are arranged one by one corresponding to the liquid cooling plates, the connecting pipes are respectively in communication with adjacent liquid cooling plates, and the connecting pipes extend in the first direction.

[0015] As preferred, the liquid cooling plate comprises a protruding portion, the box body side wall is provided with a connecting groove for the protruding portion to extend out, and the connecting mechanism is arranged on the protruding portion.

[0016] As preferred, the battery pack further comprises a cover plate and a sealing strip, the cover plate is detachably connected with the box body, and the sealing strip is arranged between the cover plate and the box body.

[0017] The beneficial effects of the utility model are as follows:

[0018] The utility model provides a kind of liquid cooling device, including liquid cooling plate, connecting mechanism, connecting pipe, liquid cooling plate is connected with battery module, and cooling cavity for cooling liquid to flow is opened inside liquid cooling plate;Connecting mechanism includes upper chuck, and upper chuck is detachably connected with liquid cooling plate, and upper chuck is opened with inlet and outlet hole, and upper chuck is communicated with cooling cavity inside by inlet and outlet hole;Upper chuck is detachably connected with connecting pipe, and connecting pipe is communicated with upper chuck inside, and connecting pipe is coaxially arranged with upper chuck.

[0019] Thus, upper chuck is communicated with cooling cavity by inlet and outlet hole, not only can make liquid cooling plate to battery module fully cool, also can simplify structure, save the arrangement quantity of pipeline, reduce the occupied space of liquid cooling device, connecting pipe and upper chuck are convenient to disassemble, without disassembling other pipeline, reduce overhaul difficulty, to improve the safety performance of liquid cooling device further. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the exploded view of battery pack in an embodiment of the utility model;

[0021] Figure 2 It is the side sectional view of battery pack in an embodiment of the utility model;

[0022] Figure 3 It is the A place enlarged view of Figure 2 in an embodiment of the utility model;

[0023] Figure 4 It is the structure schematic view of upper chuck in an embodiment of the utility model;

[0024] Figure 5 It is the structure schematic view of lower chuck in an embodiment of the utility model;

[0025] Figure 6 It is the front view of battery pack in an embodiment of the utility model.

[0026] In the drawing:

[0027] 1, liquid cooling plate;11, cooling cavity;12, water inlet;13, water outlet;14, convex part;2, connecting mechanism;21, upper chuck;211, inlet and outlet hole;212, mounting portion;213, first passage hole;214, first sealing groove;22, lower chuck;221, second passage hole;222, installation groove;223, second sealing groove;23, sealing pad;3, connecting pipe;4, battery module;5, box;51, connecting groove;6, cover plate;7, sealing strip;X, first direction.

[0028] Among them, arrow direction is the direction of cooling liquid flow. DETAILED DESCRIPTION

[0029] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0030] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In the utility model, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0032] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0033] Referring to Figures 1-3 The utility model provides a kind of liquid cooling device, including liquid cooling plate 1, connecting mechanism 2 and connecting pipe 3, liquid cooling plate 1 is connected with battery module 4, cooling cavity 11 for cooling liquid to flow is set in the inside of liquid cooling plate 1;Connecting mechanism 2 includes upper chuck 21, and upper chuck 21 is detachably connected with liquid cooling plate 1, and upper chuck 21 is set with inlet and outlet hole 211, and the inside of upper chuck 21 is communicated with cooling cavity 11 by inlet and outlet hole 211;Upper chuck 21 is detachably connected with connecting pipe 3, and the inside of connecting pipe 3 is communicated with the inside of upper chuck 21, and connecting pipe 3 is coaxially arranged with upper chuck 21.

[0034] In this embodiment, the liquid cooling plate 1 is arranged below the battery module 4 and adheres to the bottom surface of the battery module 4. The liquid cooling plate 1 is internally provided with a plurality of parallel flow channels (not shown in the figure). The length direction of the upper clamp head 21 is parallel to the thickness direction of the liquid cooling plate 1. One end of the upper clamp head 21 penetrates the liquid cooling plate 1. When the upper clamp head 21 is connected to the liquid cooling plate 1, the inlet and outlet hole 211 is located inside the cooling cavity 11. The connecting pipe 3 is a metal hose, which includes a stainless steel bellows and a hexagonal nut arranged at both ends of the stainless steel bellows. The end of the upper clamp head 21 facing the connecting pipe 3 is provided with external threads, so that the connecting pipe 3 is threadedly connected to the upper clamp head 21. The upper clamp head 21 is provided with a first passage hole 213 coaxially arranged with the upper clamp head 21. The upper clamp head 21 is in communication with the inside of the connecting pipe 3 through the first passage hole 213, and the inlet and outlet hole 211 is in communication with the first passage hole 213.

[0035] Further, the connecting mechanism 2 and the connecting pipe 3 are both provided with two groups. One group is used to transport the cooling liquid into the cooling cavity 11, and the other group is used to transport the heat-exchanged cooling liquid to the outside.

[0036] In this way, the cooling liquid is transported from one group of connecting pipes 3 into the upper clamp head 21, and then enters the liquid cooling cavity through the first passage hole 213 and the inlet and outlet hole 211, so that the liquid cooling plate 1 can fully cool the battery module 4. The heat-exchanged cooling liquid flows out of the liquid cooling plate 1 through the other group of connecting pipes 3. The structure is more simplified, the occupied space of the liquid cooling device is reduced, and the connecting pipe 3 arranged on the upper clamp head 21 is easy to disassemble, which is convenient for installation and maintenance, and reduces the difficulty of maintenance.

[0037] In some embodiments, the top surface and the bottom surface of the liquid cooling plate 1 are both 3mm thick, and the distance between the top surface and the bottom surface (i.e. the thickness of the cooling cavity 11) is 6mm. The surfaces of the liquid cooling plate 1 are welded by friction stir welding to reduce the risk of liquid leakage.

[0038] Referring to Figure 2 and Figure 3 In some embodiments, the connecting mechanism 2 further includes a lower clamp head 22 in communication with the upper clamp head 21. The lower clamp head 22 is detachably connected to the upper clamp head 21. The lower clamp head 22 is coaxially arranged with the upper clamp head 21. The ends of the upper clamp head 21 and the lower clamp head 22 away from each other are respectively located on both sides of the liquid cooling plate 1 in the first direction X. The first direction X is the thickness direction of the liquid cooling plate 1. The ends of the upper clamp head 21 and the lower clamp head 22 away from each other are respectively threadedly connected to the two connecting pipes 3. The lower clamp head 22 is internally provided with a second passage hole 221 coaxially arranged with the lower clamp head 22. The end of the lower clamp head 22 facing the connecting pipe 3 is provided with external threads.

[0039] In this way, the upper clamp head 21 passes through the liquid cooling plate 1, and the lower clamp head 22 is connected with the upper clamp head 21, so that the upper clamp head 21 and the lower clamp head 22 can be fixed on the liquid cooling plate 1, the assembly steps are simplified, the maintenance is facilitated, the upper clamp head 21 and the lower clamp head 22 are prevented from falling off in the environment of long-term swinging and vibration of the ship, and the leakage of the cooling liquid is reduced and the safety performance of the liquid cooling device is improved due to the flow of the cooling liquid through the inlet and outlet hole 211.

[0040] It can be understood that the end of the upper clamp head 21 passing through the liquid cooling plate 1 and located below the liquid cooling plate 1 can also be directly connected with the connecting pipe 3. In the embodiment, the lower clamp head 22 connected with the upper clamp head 21 is arranged so as to clamp the liquid cooling plate 1 and fix the positions of the upper clamp head 21 and the lower clamp head 22 on the liquid cooling plate 1, thereby improving the stability of the upper clamp head 21, the lower clamp head 22 and the connecting pipe 3.

[0041] Referring to Figure 3 and Figure 4 In some embodiments, the upper clamp head 21 is connected with a mounting portion 212, the inlet and outlet hole 211 is arranged on the mounting portion 212, the lower clamp head 22 is provided with a mounting groove 222 corresponding to the position of the mounting portion 212, and the mounting portion 212 is threadedly connected with the lower clamp head 22.

[0042] In the embodiment, the mounting portion 212 is arranged at the end of the upper clamp head 21 facing the lower clamp head 22, the mounting portion 212 is coaxially arranged with the upper clamp head 21, the end of the mounting portion 212 facing the lower clamp head 22 and the end of the upper clamp head 21 away from the lower clamp head 22 are respectively located on the two sides of the liquid cooling plate 1, the outer surface of the mounting portion 212 is provided with external threads, and the inner surface of the mounting groove 222 is provided with internal threads, so that the lower clamp head 22 is threadedly connected with the mounting portion 212.

[0043] In this way, by connecting the lower clamp head 22 with the mounting portion 212, the upper clamp head 21 and the lower clamp head 22 can be clamped to the liquid cooling plate 1, the loosening of the upper clamp head 21 and the lower clamp head 22 is avoided, the safety performance of the liquid cooling device is improved, and the structure is simple, facilitating assembly and maintenance; the cooling liquid flows in the first passage hole 213, the second passage hole 221 and the inlet and outlet hole 211, the leakage of the cooling liquid is avoided, and the liquid cooling plate 1 can stably cool the battery module 4.

[0044] It can be understood that the mounting portion 212 and the lower clamp head 22 can also be detachably connected through buckles, pins and the like. In the embodiment, the mounting portion 212 is threadedly connected with the lower clamp head 22, so as to enhance the sealing performance of the mounting portion 212 and the lower clamp head 22.

[0045] Referring to Figure 3 and Figure 4In some embodiments, the access holes 211 are provided in plurality, and the plurality of access holes 211 are circumferentially spaced on the side wall of the mounting portion 212. In the present embodiment, six access holes 211 are circumferentially and uniformly spaced, and the six access holes 211 are all in communication with the cooling cavity 11.

[0046] In this way, the plurality of access holes 211 can improve the circulation efficiency of the cooling liquid, and enable the cooling liquid to quickly enter or exit the liquid cooling plate 1, reduce the additional pipeline arrangement, and simplify the structure; when the liquid cooling device needs to be overhauled, the corresponding connecting structure can be removed, thereby reducing the difficulty of overhaul.

[0047] It can be understood that the number of access holes 211 can be flexibly adjusted according to actual needs, and can also be three, five, etc., which will not be enumerated here.

[0048] Referring to Figures 3-5 In some embodiments, the connecting mechanism 2 further comprises sealing pads 23, and the sealing pads 23 are provided in plurality. The sealing pads 23 are arranged between the upper clamp head 21 and the liquid cooling plate 1, and between the lower clamp head 22 and the liquid cooling plate 1.

[0049] The sealing pads 23 are made of elastic material, and the sealing pads 23 are provided in two. The end surface of the upper clamp head 21 connected with the liquid cooling plate 1 is provided with a first sealing groove 214, and the end surface of the lower clamp head 22 connected with the liquid cooling plate 1 is provided with a second sealing groove 223. The two sealing pads 23 are respectively clamped in the first sealing groove 214 and the second sealing groove 223.

[0050] In this way, the sealing pads 23 are clamped in the first sealing groove 214 and the second sealing groove 223, which not only can limit the position of the sealing pads 23, but also can make the sealing pads 23 fully abut against the liquid cooling plate 1, the upper clamp head 21 or the lower clamp head 22, so as to achieve clamping support, further improve the sealing performance of the liquid cooling device, avoid leakage of the cooling liquid, and further improve the safety performance of the liquid cooling device.

[0051] Further, the sealing pads 23 are respectively arranged at the connection between the connecting pipe 3 and the upper clamp head 21, and the connection between the connecting pipe 3 and the lower clamp head 22. The arrangement position of the sealing pads 23 can be flexibly adjusted according to the position where the liquid leakage is likely to occur, so as to achieve the purpose of enhancing the sealing performance of the liquid cooling device.

[0052] Referring to Figure 1 In some embodiments, the liquid cooling plate 1 is provided with a water inlet 12 and a water outlet 13, and the positions of the water inlet 12 and the water outlet 13 are both correspondingly provided with the connecting mechanism 2, that is, the connecting mechanism 2 is provided in two groups, and the water inlet 12 and the water outlet 13 are arranged on the same side of the liquid cooling plate 1. In the present embodiment, the water inlet 12 and the water outlet 13 penetrate through the liquid cooling plate 1 and extend along the first direction X.

[0053] In this way, the water inlet 12 and the water outlet 13 are arranged on the same side of the liquid cooling plate 1, facilitating installation and maintenance of the connecting mechanism 2 and occupying less space; the cooling liquid flows in the flow channel after entering the cooling cavity 11 through the water inlet 12, so that the liquid cooling plate 1 can uniformly cool the battery module 4 and improve the cooling effect.

[0054] It can be understood that the water inlet 12 and the water outlet 13 can also be arranged on both sides of the liquid cooling plate 1, and the arrangement positions of the water inlet 12 and the water outlet 13 can be flexibly adjusted according to actual needs, which will not be enumerated here.

[0055] Referring to Figure 6 , the utility model also provides a battery pack, including battery module 4, box 5 and liquid cooling device, battery module 4 is arranged in the inside of box 5;Liquid cooling plate 1 is provided with fixed beam (not shown in the drawing) and mounting seat (not shown in the drawing), make battery module 4 pass bolt and mounting seat realize detachable connection, and limit the relative position of battery module 4 and liquid cooling plate 1, further, still be provided with the heat-conducting silica gel (not shown in the drawing) for transmitting heat between battery module 4 and liquid cooling plate 1.

[0056] Further referring to Figure 6 , in some embodiments, the battery module 4 (referring to Figure 1 ) is provided with a plurality of battery modules 4 arranged in a stack along the first direction X, and the battery module 4 is arranged one by one corresponding to the liquid cooling plate 1, and the connecting pipe 3 is communicated with the adjacent liquid cooling plate 1 at both ends, and the connecting pipe 3 extends along the first direction X. Among them, the connecting pipe 3 corresponding to the plurality of battery modules 4 is arranged on the same side.

[0057] It should be noted that the connecting pipe 3 connected with the water inlet 12 delivers the cooling liquid into the first passage hole 213 and the second passage hole 221, and since the water inlet 12 of the liquid cooling plate 1 maintains a high pressure, there is a pressure difference between the water inlet 12 and the water outlet 13 of each liquid cooling plate 1, so that part of the cooling liquid enters the cooling cavity 11 through the inlet and outlet hole 211, and the other part of the cooling liquid flows into the adjacent liquid cooling plate 1 along the connecting pipe 3, and the connecting pipe 3 connected with the water outlet 13 is the same, realizing the circulation of the cooling liquid.

[0058] In this way, the structure of the liquid cooling device can be simplified, the occupied space can be saved, and the circulation of the cooling liquid between the plurality of liquid cooling plates 1 can be facilitated; when the liquid cooling device corresponding to a certain battery module 4 needs to be repaired, only the corresponding connecting mechanism 2 needs to be removed, so that the influence on the liquid cooling device corresponding to other battery modules 4 during maintenance can be avoided, and the difficulty of maintenance can be reduced.

[0059] Referring to Figure 1 , in some embodiments, the liquid cooling plate 1 includes a protruding portion 14, the side wall of the box 5 is provided with a connecting groove 51 for the protruding portion 14 to extend out, and the connecting mechanism 2 is arranged on the protruding portion 14.

[0060] The protruding part 14 is located on one side of the liquid cooling plate 1, the thickness of the connecting groove 51 is matched with the thickness of the protruding part 14, the water inlet 12 and the water outlet 13 of the liquid cooling plate 1 are arranged on the protruding part 14, that is, the protruding part 14, the connecting mechanism 2 and the connecting pipe 3 are all located outside the box body 5, and the sealing glue (not shown in the figure) is arranged between the protruding part 14 and the connecting groove 51.

[0061] In this way, after the battery module 4 and the liquid cooling plate 1 are assembled to the box body 5, since the protruding part 14 is located outside the box body 5, the connecting mechanism 2 and the connecting pipe 3 are convenient to install and maintain, so that the connecting mechanism 2 and the connecting pipe 3 do not need to be operated inside the box body 5 when faults occur, and the difficulty of maintenance is reduced.

[0062] It can be understood that the protruding part 14 can also be arranged inside the box body 5, the arrangement position of the protruding part 14 can be adjusted according to actual needs, and the connecting mechanism 2 and the connecting pipe 3 can also be arranged inside the box body 5, which will not be enumerated here.

[0063] Referring to Figure 1 In some embodiments, the battery pack further comprises a cover plate 6 and a sealing strip 7, the cover plate 6 is detachably connected with the box body 5, and the sealing strip 7 is arranged between the cover plate 6 and the box body 5.

[0064] The cover plate 6 is detachably connected with the box body by bolts, and the sealing strip 7 is made of foamed silica gel material, so that the sealing performance between the cover plate 6 and the box body 5 is enhanced.

[0065] It can be understood that the material of the sealing strip 7 can also be rubber and the like, and is not limited to foamed silica gel material, which will not be enumerated here.

[0066] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A liquid cooling device, characterized by, The application relates to a liquid cooling device. The liquid cooling device comprises a liquid cooling plate (1) connected with a battery module (4), wherein a cooling cavity (11) for flowing cooling liquid is arranged in the liquid cooling plate (1); a connecting mechanism (2) comprising an upper clamp head (21) detachably connected with the liquid cooling plate (1), wherein an inlet and outlet hole (211) is arranged in the upper clamp head (21), and the cooling cavity (11) is communicated with the inside of the upper clamp head (21) through the inlet and outlet hole (211); and a connecting pipe (3) detachably connected with the upper clamp head (21), wherein the inside of the connecting pipe (3) is communicated with the inside of the upper clamp head (21), and the connecting pipe (3) is coaxially arranged with the upper clamp head (21). The connecting mechanism (2) further comprises a lower clamp head (22) communicated with the upper clamp head (21), wherein the lower clamp head (22) is detachably connected with the upper clamp head (21), the lower clamp head (22) is coaxially arranged with the upper clamp head (21), and the ends of the upper clamp head (21) and the lower clamp head (22) away from each other are located on the two sides of the liquid cooling plate (1) in a first direction (X). The first direction (X) is the thickness direction of the liquid cooling plate (1).

2. The liquid cooling device of claim 1, wherein, The upper clamp head (21) is connected with a mounting part (212), the inlet and outlet hole (211) is arranged on the mounting part (212), the lower clamp head (22) is provided with a mounting groove (222) corresponding to the position of the mounting part (212), so that the mounting part (212) is threadedly connected with the lower clamp head (22). The inlet and outlet hole (211) is provided with a plurality of inlet and outlet holes (211) arranged on the side wall of the mounting part (212) in a circumferential direction.

3. The liquid cooling device of claim 2, wherein, The connecting mechanism (2) further comprises a sealing gasket (23) arranged between the upper clamp head (21) and the liquid cooling plate (1), and / or the sealing gasket (23) is arranged between the lower clamp head (22) and the liquid cooling plate (1).

4. The liquid cooling device of claim 3, wherein, The liquid cooling plate (1) is provided with a water inlet (12) and a water outlet (13), the positions of the water inlet (12) and the water outlet (13) correspond to the positions of the connecting mechanism (2), and the water inlet (12) and the water outlet (13) are arranged on the same side of the liquid cooling plate (1).

5. The liquid cooling device of claim 2, wherein, The liquid cooling device comprises a battery module (4), a box body (5) and the liquid cooling device according to any one of claims 1-6, wherein the battery module (4) is arranged in the box body (5).

6. The liquid cooling device according to any one of claims 1 to 5, characterized in that, The battery module (4) is provided with a plurality of battery modules (4) arranged in the first direction (X), the battery module (4) is arranged in one-to-one correspondence with the liquid cooling plate (1), the connecting pipe (3) is communicated with adjacent liquid cooling plates (1) at two ends, and the connecting pipe (3) extends along the first direction (X).

7. A battery pack, characterized by, The liquid cooling plate (1) comprises a protruding part (14), the box body (5) is provided with a connecting groove (51) for the protruding part (14) to extend out, and the connecting mechanism (2) is arranged on the protruding part (14).

8. The battery pack of claim 7, wherein, ​ 9. The battery pack of claim 7, wherein, ​ 10. The battery pack of claim 7, wherein, The battery pack further comprises a cover plate (6) and a sealing strip (7), the cover plate (6) is detachably connected with the box (5), and the sealing strip (7) is arranged between the cover plate (6) and the box (5).

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