Liquid cooling module and lithium battery pack

Abstract

The invention proposes a liquid-cooled module and a lithium battery pack. The liquid-cooled module comprises: a battery module, consisting of liquid-cooled plates and multiple batteries arranged in series in the first direction, wherein each liquid-cooled plate includes cooling flow channels, and the liquid inlet and outlet ports are connected to the cooling flow channels; a first and second end plate, located on opposite sides of the battery module in the first direction; fixing structures, passing through the first and second end plates; and pre-tensioning force adjustment structures, each pre-tensioning force adjustment structure connected to one end of the corresponding fixing structure extending out of the second end plate, and each pre-tensioning force adjustment structure having a first and second position, where the pre-tensioning force adjustment structure rests against the second end plate to adjust the distance between the first and second end plates.According to the invention's technical solution, the pre-tightening force can be adjusted to ensure that the batteries have sufficient space for heat exchange and dissipation, thereby ensuring efficient heat exchange.

Description

Liquid cooling module and lithium battery assembly

[0001] This application claims priority to the patent application filed with the State Intellectual Property Office of China on October 19, 2023, with application number 2023113633336 and invention name “Liquid Cooling Module and Lithium Battery Assembly”. Technical Field

[0002] The present invention relates to the field of battery technology, and in particular to a liquid cooling module and a lithium battery assembly. Background Art

[0003] With the rapid development of new energy vehicles worldwide in recent years, demand for lithium-ion batteries has exploded. Consequently, major automakers and research institutions have continuously increased their research and development efforts in electric vehicles. Governments around the world have also implemented various measures to promote the adoption of new energy vehicles, significantly boosting their development. Compared to traditional fuel vehicles, electric vehicles offer zero emissions, replacing oil with electricity and reducing greenhouse gas emissions, among other pollutants, contributing to the country's dual-carbon strategy.

[0004] Research on the three key components of electric vehicles (electric motors, batteries, and electronic controls) is maturing, and industrialization is increasing. Some research institutions and new energy companies have conducted valuable explorations in battery pack structures. However, achieving highly safe, reliable, and efficient battery packs remains a constant pursuit in the new energy vehicle sector. Furthermore, liquid cooling technology, as a key method for reducing the risk of thermal runaway, is gaining popularity in a growing number of battery products.

[0005] Currently, existing liquid cooling modules include a cell structure, liquid cooling plates located on either side of the cell structure, and two end plates located at either end of the cell structure. The two end plates are connected by a locking member to lock the two end plates and the cell structure together to form an integrated structure. However, as the liquid cooling module is used, the cell expands due to heat release, increasing its volume and reducing the distance between adjacent cells. This lacks sufficient space for heat exchange and dissipation, and thus fails to meet heat exchange requirements. In other words, the module preload increases with time, seriously affecting the lifespan of the cell.

[0006] Summary of the Invention

[0007] The main purpose of the present invention is to provide a liquid cooling module and a lithium battery assembly, which can solve the problem in the prior art that the preload force and expansion displacement of the battery cell are significantly increased, thereby affecting the heat exchange effect.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a liquid cooling module is provided, comprising: a battery cell module, comprising a liquid cooling plate and a plurality of battery cells arranged in sequence along a first direction; wherein the liquid cooling plate comprises a cooling channel and a liquid inlet and a liquid outlet connected to the cooling channel; a first end plate and a second end plate, located on opposite sides of the first direction of the battery cell module; a fastening structure, passing through the first end plate and the second end plate; a pre-tightening force adjustment structure, connected to one end of the fastening structure passing through the second end plate, the pre-tightening force adjustment structure having a first position and a second position abutting the second end plate to adjust the distance between the first end plate and the second end plate.

[0009] Furthermore, the preload adjustment structure is rotatably arranged relative to the fastening structure to convert the rotation of the preload adjustment structure into linear motion of the second end plate, so that the second end plate moves away from or towards the first end plate.

[0010] Furthermore, the preload adjustment structure includes an unequal wheel structure and a rotating shaft. The unequal wheel structure is rotatably connected to the fastening structure through the rotating shaft. The outer peripheral surface of the unequal wheel structure has a first surface and a second surface. The distance between the first surface and the rotation center of the unequal wheel structure is greater than the distance between the second surface and the rotation center of the unequal wheel structure.

[0011] Furthermore, the outer circumference of the unequal-sided wheel structure further includes a plurality of third surfaces, and the distances between the plurality of third surfaces and the rotation center of the unequal-sided wheel structure are different.

[0012] Furthermore, along a second direction that is at an angle to the first direction, unequal-sided rotating wheel structures are provided on both sides of the fastening structure, and multiple unequal-sided rotating wheel structures are fixedly connected; and / or, the liquid cooling module includes two fastening structures and two pre-tightening force adjustment structures corresponding to the two fastening structures, and the two fastening structures are respectively arranged on opposite sides of the second direction of the battery cell module.

[0013] Furthermore, a plurality of cooling channels are provided in the liquid cooling plate, one end of each cooling channel is connected to the liquid inlet, and the other end of each cooling channel is connected to the liquid outlet. Along the second direction, the liquid inlet and the liquid outlet are located on opposite sides of the liquid cooling plate, and the plurality of cooling channels are arranged in sequence in the third direction, and the third direction forms an angle with the first direction.

[0014] Furthermore, the multiple cooling channels include at least a first cooling channel and a second cooling channel, the first cooling channel and the second cooling channel both include bent pipes, the cross-sectional area of ​​the first cooling channel is larger than the cross-sectional area of ​​the second cooling channel, and the expanded length of the first cooling channel is smaller than the expanded length of the second cooling channel.

[0015] Furthermore, the liquid cooling module also includes two flow-guiding structures, which are respectively arranged at the liquid inlet and liquid outlet of the liquid cooling plate. Each flow-guiding structure includes: a main pipe, which is provided with a flow channel, and a pipe plug is welded at one end of the flow channel, which is used to prevent leakage of the coolant; a plurality of liquid distribution pipes, which are arranged corresponding to the plurality of liquid cooling plates, and one end of each liquid distribution pipe is connected to the flow channel, and the other end of each liquid distribution pipe is connected to the liquid inlet or liquid outlet of the liquid cooling plate.

[0016] Furthermore, the diversion structure also includes a locking part, which includes a first threaded part, an operating part and a second threaded part connected in sequence. The rotation directions of the first threaded part and the second threaded part are opposite. A first threaded hole that is threadedly matched with the first threaded part is provided on the liquid distribution tube, and a second threaded hole that is threadedly matched with the second threaded part is provided on the main tube.

[0017] Furthermore, along the first direction, a first pole and a second pole are respectively provided on two opposite sides of the battery cell, the first pole protrudes from the surface of the battery cell, and the second pole is recessed in the surface of the battery cell, and an avoidance through-hole for the pole to pass through is provided on the liquid cooling plate; and / or, the liquid cooling module also includes a main pipe, which is provided with a through-hole for part of the fastening structure to pass through.

[0018] According to one aspect of the present invention, a lithium battery assembly is provided, comprising a box and the above-mentioned liquid cooling module disposed in the box.

[0019] Applying the technical solution of the present invention, a liquid cooling plate is provided between two adjacent battery cells. This allows for large-surface cooling between the battery cells, increasing the contact area between the battery cells and the liquid cooling plate and improving the heat exchange efficiency of the battery cells. By providing a liquid cooling plate between two adjacent battery cells, the liquid cooling module achieves excellent heat exchange performance, and the entire liquid cooling module can be disassembled and reused without damaging the structure. When the preload adjustment structure is in the second position, the second end plate is close to the first end plate. At this point, the accommodation space is small. The first end plate, the second end plate, and the fastening structure can lock multiple battery cells and ensure an appropriate spacing between adjacent battery cells to meet heat exchange requirements. After the liquid cooling module has operated for a period of time, the preload adjustment structure is switched from the second position to the first position, with the second end plate away from the first end plate. At this point, the accommodation space is larger, ensuring an appropriate spacing between adjacent battery cells and providing sufficient heat exchange space for the battery cells. When the preload and expansion displacement of the liquid cooling module increase significantly, the preload adjustment structure can be adjusted to achieve excellent heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] FIG1 shows a schematic structural diagram of a liquid cooling module according to an embodiment of the present invention;

[0022] FIG2 shows an exploded view of the liquid cooling module of FIG1 ;

[0023] FIG3 shows a partial enlarged view of the liquid cooling module of FIG2 ;

[0024] FIG4 shows a side view of the liquid cooling module of FIG2 ;

[0025] FIG5 is a schematic structural diagram showing the unequal-sided rotor structure of the liquid cooling module of FIG2 ;

[0026] FIG6 shows a schematic structural diagram of the second end plate of the liquid cooling module of FIG2 ;

[0027] FIG7 shows a schematic structural diagram of the liquid cooling plate of the liquid cooling module of FIG2 ;

[0028] FIG8 shows a schematic diagram of the internal structure of the liquid cooling plate of FIG7 ;

[0029] FIG9 shows a schematic structural diagram of the main pipe of the liquid cooling module of FIG2 ;

[0030] FIG10 is a schematic structural diagram of the liquid dispensing pipe of the liquid cooling module of FIG2 ;

[0031] FIG11 is a schematic structural diagram showing an angle of the battery cell of the liquid cooling module of FIG2 ;

[0032] FIG12 shows a schematic structural diagram of the battery cell of FIG11 from another angle.

[0033] Among them, the above-mentioned drawings include the following figure marks: 1. rotating shaft; 2. operating part; 211. first surface; 212. second surface; 213. third surface; 22. unequal-sided rotor structure; 221. eccentric hole; 301. first end plate; 302. second end plate; 4. battery cell; 41. first pole; 42. second pole; 5. liquid cooling plate; 501. liquid inlet; 502. liquid outlet; 505. avoidance hole; 53. first cooling channel; 54. second cooling channel; 7. fastening structure; 71. rod; 72. limit plate; 8. main pipe; 81. flow channel; 82. through hole; 9. liquid distribution pipe; 10. locking part. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] 1 to 12 , the present invention provides a liquid cooling module, comprising: a battery cell module, comprising a liquid cooling plate 5 and a plurality of battery cells 4 arranged in sequence along a first direction; wherein a liquid cooling plate 5 is provided between two adjacent battery cells 4, the liquid cooling plate 5 comprising a cooling channel and a liquid inlet 501 and a liquid outlet 502 connected to the cooling channel; a first end plate 301 and a second end plate 302, located on opposite sides of the battery cell module in the first direction; a fastening structure 7, which is passed through the first end plate 301 and the second end plate 302, the fastening structure 7, the first end plate 301 and the second end plate 302 forming an accommodating space for accommodating the battery cell module; a pre-tightening force adjustment structure, connected to an end of the fastening structure passing through the second end plate 302, the pre-tightening force adjustment structure having a first position and a second position abutting the second end plate 302, so that the second end plate 302 moves away from or close to the first end plate 301.

[0036] It should be noted that the "preload force of the liquid cooling module" herein refers to the squeezing force exerted on the first and second end plates 301, 302 in a first direction by the expansion of the liquid cooling module. In the prior art, the volume of battery cells increases (i.e., the preload force increases) after heat release and expansion, and the spacing between adjacent battery cells decreases, leaving insufficient space for heat exchange and dissipation. This application, by providing a preload force adjustment structure, is able to adjust the spacing between the first and second end plates 301, 302, thereby ensuring that the liquid cooling module has a larger heat exchange space and better heat exchange performance.

[0037] In the above technical solution, a liquid cooling plate 5 is provided between two adjacent battery cells 4. In this way, a large surface cooling method is adopted between the battery cells 4, which increases the contact area between the battery cells 4 and the liquid cooling plate 5 and improves the heat exchange efficiency of the battery cells 4. By providing a liquid cooling plate 5 between two adjacent battery cells 4, the liquid cooling module has a good heat exchange effect, and the entire liquid cooling module can be disassembled and reused without damaging the structure of the liquid cooling module. When the preload adjustment structure is in the second position, the second end plate 302 is close to the first end plate 301. At this time, the accommodation space is small. The first end plate 301, the second end plate 302 and the fastening structure 7 can lock the multiple battery cells 4 and ensure that the distance between the two adjacent battery cells 4 is appropriate to meet the heat exchange requirements. After the liquid cooling module has been in operation for a period of time, the preload adjustment structure is switched from the second position to the first position, and the second end plate 302 is away from the first end plate 301. At this time, the accommodation space is large, which can ensure that the distance between the two adjacent battery cells 4 is appropriate, providing sufficient heat exchange space for the battery cells 4.

[0038] Through the above arrangement, when the preload force and expansion displacement of the liquid cooling module are significantly increased, the liquid cooling module can have a good heat exchange effect by adjusting the preload force adjustment structure.

[0039] As shown in FIG. 1 to FIG. 5 , in an embodiment of the present invention, the preload force adjustment structure is rotatably arranged relative to the fastening structure 7 to convert the rotation of the preload force adjustment structure into a linear motion of the second end plate 302 .

[0040] In the above technical solution, the preload force adjustment structure includes an unequal wheel structure 22 and a rotating shaft 1. The unequal wheel structure 22 is rotatably connected to the fastening structure 7 through the rotating shaft 1. The outer peripheral surface of the unequal wheel structure 22 has a first surface 211 and a second surface 212. The distance between the first surface 211 and the rotation center of the unequal wheel structure 22 is greater than the distance between the second surface 212 and the rotation center of the unequal wheel structure 22.

[0041] In the above technical solution, the scalene runner structure 22 is provided with an eccentric hole 221, the central axis of which serves as the rotation center of the scalene runner structure 22. The eccentric hole 221 is a threaded hole, and the fastening structure 7 is provided with a mounting through-hole. The rotating shaft is a pin, which is threadedly connected to the eccentric hole 221 and passes through the mounting through-hole. In this way, the scalene runner structure 22 is rotationally connected to the fastening structure 7 via the rotating shaft 1, and the pin is prevented from being separated from the scalene runner structure 22.

[0042] With the above arrangement, when the first surface 211 is in contact with the second end plate 302, the distance between the rotation center of the unequal wheel structure 22 and the second end plate 302 is large, and the preload adjustment structure is in the second position. When the second surface 212 is in contact with the second end plate 302, the distance between the rotation center of the unequal wheel structure 22 and the second end plate 302 is small, and the preload adjustment structure is in the first position. The preload adjustment structure has two gears. In this way, when the first surface 211 or the second surface 212 is in contact with the second end plate 302, under the action of the pre-tightening force in the liquid cooling module (i.e., the extrusion force generated on the first end plate 301 and the second end plate 302 after the liquid cooling module expands), the liquid cooling module applies a force F as shown in Figure 4 to the second end plate 302 and the unequal wheel structure 22. The force F is horizontally to the left along Figure 4 and acts on the rotation center of the unequal wheel structure 22 (i.e., the eccentric hole 221). In this way, the liquid cooling module does not apply additional deflection torque to the unequal wheel structure 22, and the unequal wheel structure 22 can remain in this position.

[0043] In another embodiment of the present invention, the eccentric hole 221 can also be a through hole with a smooth inner wall. The pin shaft is interference fit with the eccentric hole 221 and passes through the mounting through hole. In this way, the unequal-sided wheel structure 22 can be rotatably connected to the fastening structure 7, and the pin shaft can be prevented from being separated from the unequal-sided wheel structure 22.

[0044] As shown in FIG. 1 to FIG. 5 , in an embodiment of the present invention, the outer circumference of the unequal-sided wheel structure 22 further includes a plurality of third surfaces 213 , and the distances between the plurality of third surfaces 213 and the rotation center of the unequal-sided wheel structure 22 are different.

[0045] In the above technical solution, the first surface 211, the second surface 212 and the plurality of third surfaces 213 are connected end to end in sequence, and the plurality of third surfaces 213 can all fit with the second end plate 302, so that the preload adjustment structure has more than three gears.

[0046] As shown in Figure 5, in an embodiment of the present invention, the preload adjustment structure includes a plurality of unequal wheel structures 22. Along the second direction at an angle to the first direction, unequal wheel structures 22 are provided on both sides of the fastening structure 7, and the plurality of unequal wheel structures 22 are fixedly connected.

[0047] Through the above arrangement, the rotating shaft 1 is passed through the two unequal-sided wheel structures 22 and the fastening structure 7. Thus, since the rotating shaft 1 is threadedly connected to the unequal-sided wheel structure 22, the rotating shaft 1 can be prevented from being separated from the fastening structure 7, thereby ensuring stability.

[0048] As shown in Figure 5, in an embodiment of the present invention, the liquid cooling module includes two fastening structures 7 and two pre-tightening force adjustment structures arranged in a one-to-one correspondence with the two fastening structures 7. The two fastening structures are distributed on opposite sides of the second direction of the battery cell module, and the pre-tightening force can be adjusted on both sides of the battery cell module.

[0049] In one embodiment of the present invention, the liquid cooling module may also include three or more fastening structures, and the pre-tightening force adjustment structure is arranged corresponding to the fastening structure.

[0050] As shown in Figure 5, in an embodiment of the present invention, the liquid cooling module also includes an operating part 2, and each preload adjustment structure includes two unequal-sided wheel structures 22, and the two unequal-sided wheel structures 22 are respectively connected to the operating part 2. In this way, the two unequal-sided wheel structures 22 can be adjusted at the same time through the operating part 2, and each preload adjustment structure can be adjusted separately.

[0051] In the embodiment of the present invention, the first end plate 301 and the second end plate 302 have the same structure.

[0052] As shown in Figures 7 and 8, in an embodiment of the present invention, a plurality of cooling channels are provided in the liquid cooling plate 5, one end of each cooling channel is connected to the liquid inlet 501, and the other end of each cooling channel is connected to the liquid outlet 502. Along the second direction, the liquid inlet 501 and the liquid outlet 502 are located on opposite sides of the liquid cooling plate 5, and the plurality of cooling channels are arranged in sequence in the third direction, and the third direction forms an angle with the first direction.

[0053] In the above technical solution, the liquid inlet 501 and the liquid outlet 502 are located at the same height. By providing a plurality of cooling channels, the battery cell 4 can be cooled in the third direction, thereby expanding the cooling area.

[0054] As shown in Figures 7 and 8, in an embodiment of the present invention, the multiple cooling channels include at least a first cooling channel 53 and a second cooling channel 54, the first cooling channel 53 and the second cooling channel 54 both include bent pipes, the cross-sectional area of ​​the first cooling channel 53 is greater than the cross-sectional area of ​​the second cooling channel 54, and the expanded length of the first cooling channel 53 is less than the expanded length of the second cooling channel 54.

[0055] Through the above arrangement, the flow rate of the liquid in the first cooling channel 53 and the second cooling channel 54 can be ensured, thereby ensuring uniform cooling effect in the area where the first cooling channel 53 and the second cooling channel 54 flow through.

[0056] As shown in Figures 1 to 9, in an embodiment of the present invention, the liquid cooling module also includes two flow-guiding structures, which are respectively arranged at the liquid inlet and liquid outlet ends of the liquid cooling plate 5, and each flow-guiding structure includes: a main pipe 8, which is provided with a flow channel 81; a plurality of liquid distribution pipes 9, which are arranged corresponding to the plurality of liquid cooling plates 5, one end of each liquid distribution pipe 9 is connected to the flow channel 81, and the other end of each liquid distribution pipe 9 is connected to the liquid inlet 501 or the liquid outlet 502 of the liquid cooling plate 5.

[0057] In the above technical solution, the flow guiding structure further includes a liquid inlet pipe and a liquid outlet pipe. One end of the flow channel 81 is connected to the liquid inlet pipe or the liquid outlet pipe, and the other end is provided with a plug to prevent liquid from flowing out.

[0058] Through the above arrangement, the coolant passes through the liquid inlet pipe, a main pipe 8 of a guide structure, and the liquid distribution pipe 9 in sequence and then enters the liquid cooling plate 5. The liquid discharged from the liquid cooling plate 5 flows into the liquid outlet pipe through another guide structure.

[0059] In one embodiment, both the liquid inlet pipe and the liquid outlet pipe pass through the through holes on the first end plate 301 and are connected to the main pipe 8 , which can reduce the risk points of liquid leakage.

[0060] As shown in FIG. 1 to FIG. 9 , in an embodiment of the present invention, a through hole 82 is formed on the main pipe 8 for a portion of the fastening structure to pass through.

[0061] In the above technical solution, through holes are provided on the first end plate 301 and the second end plate 302, and the fastening structure 7 includes a rod 71 and a limit plate 72 with successively increasing outer diameters. The rod 71 is passed through the through hole 82 and the through holes on the first end plate 301 and the second end plate 302. One end of the rod 71 is provided with a mounting through hole for passing a pin shaft, and the other end of the rod 71 is connected to the limit plate 72. The limit plate 72 is located on the side of the first end plate 301 away from the liquid cooling module. In this way, the limit plate 72 can stop and limit the rod 71 and the first end plate 301 in the first direction to prevent the rod 71 from disengaging from the first end plate 301. Since the rod 71 is passed through the through hole 82 of the main pipe 8, the main pipe 8 can also be prevented from disengaging from the first end plate 301.

[0062] Through the above arrangement, the main pipe 8 can limit the fastening structure, the first end plate 301 and the second end plate 302, thereby preventing the battery cell 4 from being over-compressed. In this way, the main pipe 8 can integrate the flow channel 81 and the through hole 82 into a single pipe, saving space.

[0063] In the embodiment of the present invention, one end of the flow channel 81 is communicated with an external coolant inlet pipe, and the other end of the flow channel 81 is welded with a pipe plug, which is used to prevent leakage of the coolant.

[0064] As shown in Figures 1 and 2, in an embodiment of the present invention, the diversion structure also includes a locking member 10, which includes a first threaded portion, an operating portion, and a second threaded portion connected in sequence. The rotation directions of the first threaded portion and the second threaded portion are opposite. A first threaded hole that is threadedly matched with the first threaded portion is provided on the liquid distribution tube 9, and a second threaded hole that is threadedly matched with the second threaded portion is provided on the main pipe 8.

[0065] With the above arrangement, by rotating the operating portion clockwise or counterclockwise, the locking member 10 can be locked or released with the main pipe 8 and the liquid distribution pipe 9 respectively, which facilitates operation.

[0066] As shown in Figures 11 and 12, in an embodiment of the present invention, along the first direction, a first pole 41 and a second pole 42 are respectively provided on two opposite sides of the battery cell 4, the first pole 41 protrudes from the surface of the battery cell 4, and the second pole 42 is recessed in the surface of the battery cell 4, and an avoidance through-hole 505 is provided on the liquid cooling plate 5 for the pole to pass through.

[0067] In the above technical solution, the first pole 41 and the second pole 42 are both located at the center of the battery cell 4. When the battery cell module is assembled, the poles of two adjacent battery cells 4 are directly connected to each other, avoiding the use of series rows, improving assembly efficiency, and ensuring that the module structure is detachable.

[0068] The present invention also provides a lithium battery assembly, comprising a box body and the above-mentioned liquid cooling module arranged in the box body.

[0069] It should be noted that during actual installation, both the upper and lower surfaces of the liquid cooling module can be used as mounting surfaces to be fixedly connected to the box body. Module mounting holes are provided on the first end plate 301 and the second end plate 302 for fixing the liquid cooling module to the box body.

[0070] In one embodiment of the present invention, the module mounting hole of at least one of the first end plate 301 and the second end plate 302 is a waist-shaped hole. In this way, as the pre-tightening force of the liquid cooling module changes, the distance between the first end plate 301 and the second end plate 302 in the first direction changes, which can ensure that the module mounting hole can always correspond to the mounting hole on the box, thereby fixing the liquid cooling module to the box.

[0071] The lithium battery assembly of the present invention has all the technical features and all the technical effects of the above-mentioned liquid cooling module, which will not be described in detail here.

[0072] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: a liquid cooling plate is provided between two adjacent battery cells, so that a large surface cooling method is adopted between the battery cells, which increases the contact area between the battery cells and the liquid cooling plate and improves the heat exchange efficiency of the battery cells; by providing a liquid cooling plate between two adjacent battery cells, the liquid cooling module has a good heat exchange effect, and the liquid cooling module as a whole can be disassembled and reused without damaging the structure of the liquid cooling module. When the preload adjustment structure is in the second position, the second end plate is close to the first end plate. At this time, the accommodation space is small. The first end plate, the second end plate and the fastening structure can lock the multiple battery cells and can meet the requirements of heat exchange at an appropriate distance between the two adjacent battery cells; after the liquid cooling module has been working for a period of time, the preload adjustment structure is switched from the second position to the first position, and the second end plate is away from the first end plate. At this time, the accommodation space is large, which can ensure that there is an appropriate distance between the two adjacent battery cells and provide sufficient heat exchange space for the battery cells. When the preload force and expansion displacement of the liquid cooling module increase significantly, the liquid cooling module can achieve a good heat exchange effect by adjusting the preload force adjustment structure.

[0073] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0075] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A liquid cooling module, characterized in that: include: A battery cell module, comprising a liquid cooling plate (5) and a plurality of battery cells (4) arranged in sequence along a first direction; A first end plate (301) and a second end plate (302) are located on opposite sides of the battery cell module in a first direction; The liquid cooling plate (5) comprises a cooling channel and a liquid inlet (501) and a liquid outlet (502) communicated with the cooling channel; A fastening structure (7) is provided on the first end plate (301) and the second end plate (302); A preload adjustment structure is connected to one end of the fastening structure that passes through the second end plate (302), and the preload adjustment structure has a first position and a second position that abut against the second end plate (302) to adjust the distance between the first end plate (301) and the second end plate (302).

2. The liquid cooling module according to claim 1, characterized in that: The preload adjustment structure is rotatably arranged relative to the fastening structure (7) to convert the rotation of the preload adjustment structure into a linear motion of the second end plate (302), so that the second end plate (302) moves in a direction away from or close to the first end plate (301).

3. The liquid cooling module according to claim 1, characterized in that: The preload force adjustment structure comprises an unequal wheel structure (22) and a rotating shaft (1); the unequal wheel structure (22) is rotatably connected to the fastening structure (7) via the rotating shaft (1); the outer peripheral surface of the unequal wheel structure (22) comprises a first surface (211) and a second surface (212); the distance between the first surface (211) and the rotation center of the unequal wheel structure (22) is greater than the distance between the second surface (212) and the rotation center of the unequal wheel structure (22).

4. The liquid cooling module according to claim 3, characterized in that: The outer peripheral surface of the unequal-sided rotating wheel structure (22) further comprises a plurality of third surfaces (213), and the distances between the plurality of third surfaces (213) and the rotation center of the unequal-sided rotating wheel structure (22) are different.

5. The liquid cooling module according to claim 3, characterized in that: Along a second direction forming an angle with the first direction, the unequal-sided rotating wheel structures (22) are provided on both sides of the fastening structure (7), and a plurality of the unequal-sided rotating wheel structures (22) are fixedly connected; and / or, The liquid cooling module includes two fastening structures and two pre-tightening force adjustment structures arranged corresponding to the two fastening structures, and the two fastening structures are respectively arranged on opposite sides of the second direction of the battery module.

6. The liquid cooling module according to any one of claims 1 to 5, characterized in that: A plurality of cooling channels are provided in the liquid cooling plate (5), one end of each cooling channel is connected to the liquid inlet (501), and the other end of each cooling channel is connected to the liquid outlet (502); along a second direction forming an angle with the first direction, the liquid inlet (501) and the liquid outlet (502) are located on opposite sides of the liquid cooling plate (5); and the plurality of cooling channels are arranged in sequence in a third direction, and the third direction forms an angle with the first direction.

7. The liquid cooling module according to claim 6, characterized in that: The plurality of cooling channels at least include a first cooling channel (53) and a second cooling channel (54); the first cooling channel (53) and the second cooling channel (54) both include bent pipes; the cross-sectional area of ​​the first cooling channel (53) is greater than the cross-sectional area of ​​the second cooling channel (54); and the expanded length of the first cooling channel (53) is less than the expanded length of the second cooling channel (54).

8. The liquid cooling module according to any one of claims 1 to 5, characterized in that: The liquid cooling module further comprises two flow guiding structures, which are respectively arranged at the liquid inlet end and the liquid outlet end of the liquid cooling plate (5), and each of the flow guiding structures comprises: The main pipe (8) is provided with a flow passage (81), one end of the flow passage (81) is welded with a pipe plug, and the pipe plug is used to prevent leakage of the coolant; A plurality of liquid distribution tubes (9) are arranged corresponding to the plurality of liquid cooling plates (5), one end of each of the liquid distribution tubes (9) is connected to the flow channel (81), and the other end of each of the liquid distribution tubes (9) is connected to the liquid inlet (501) or the liquid outlet (502) of the liquid cooling plate (5).

9. The liquid cooling module according to claim 8, characterized in that: The flow guiding structure further comprises a locking member (10), wherein the locking member (10) comprises a first threaded portion, an operating portion and a second threaded portion which are connected in sequence, wherein the first threaded portion and the second threaded portion have opposite rotation directions, and the liquid dispensing tube (9) is provided with a first threaded hole which is threadably matched with the first threaded portion, and the main tube (8) is provided with a second threaded hole which is threadably matched with the second threaded portion.

10. The liquid cooling module according to any one of claims 1 to 5, characterized in that: Along the first direction, two oppositely disposed sides of the battery cell (4) are respectively provided with a first pole (41) and a second pole (42), the first pole (41) protrudes from the surface of the battery cell (4), the second pole (42) is recessed from the surface of the battery cell (4), and the liquid cooling plate (5) is provided with an avoidance through hole (505) for the pole to pass through; and / or, The liquid cooling module also includes a main pipe (8), and a through hole (82) is provided on the main pipe (8) for a portion of the fastening structure to pass through.

11. A lithium battery assembly, characterized in that: The invention comprises a box body and a liquid cooling module as claimed in any one of claims 1 to 10 arranged in the box body.

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