Liquid cooling assembly, power battery pack and vehicle

Abstract

The invention discloses a liquid cooling assembly, a power battery pack and a vehicle, in the liquid cooling assembly, a pressing strip and a collecting pipe are directly designed to be in a concave-convex matching mode, the pressing strip can realize positioning of the collecting pipe in one direction or several directions in a box body, other parts do not need to be additionally arranged, the cost is reduced, and the working efficiency is improved. And the positioning structure of the liquid cooling plate in the box body is simplified, so that the system integration degree can be improved, the overall weight of the power battery pack can be reduced, optimal design space can be provided for electric devices and pipelines in the power battery pack, and the overall performance of the power battery pack is further improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a liquid cooling component, a power battery pack, and a vehicle. Background Technology

[0002] As the requirements for charging speed of power battery packs become increasingly stringent, the charging rate of battery cells is also gradually breaking new records. This increase in charging rate often leads to higher heat generation, meaning that traditional bottom cooling methods are no longer sufficient to meet the overall heat dissipation needs of the battery cells.

[0003] Under high-rate charging conditions, the performance of a battery cell is limited by the high temperature in localized areas, such as the terminals. Once the charging rate exceeds a certain limit, the temperature rise rate of the terminals tends to be faster and higher, further limiting the cell's charging performance. Therefore, more and more power battery pack products are incorporating top cooling devices to cool the cell terminals. However, the addition of top cooling devices increases the complexity of the power battery pack structure. Therefore, simplifying the power battery pack structure and improving its integration is a crucial issue of concern to those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide a liquid cooling component with a simpler main body positioning, which can improve system integration. Another purpose of this application is to provide a power battery pack and a vehicle including the above-mentioned liquid cooling component.

[0005] This application provides a liquid cooling assembly, including:

[0006] The liquid cooling body includes two current collectors and a heat exchange tube located between the two current collectors;

[0007] The pressure strip extends in the same direction as the heat exchange tube, and the end of the pressure strip is in concave-convex fit with the outer wall of the current collector. The pressure strip also has a fixing part.

[0008] Compared with the existing technology that specifically sets positioning brackets and positioning pins on the current collector, the embodiment of this application directly designs the pressure strip and the current collector in a concave-convex fit. The pressure strip can realize the positioning of the current collector in one or several directions inside the box without the need for additional components, reducing costs and simplifying the positioning structure of the liquid cooling body in the box. This not only improves the system integration and reduces the overall weight of the power battery pack, but also provides space for optimized design of electrical components and pipelines inside the power battery pack, further improving the overall performance of the power battery pack.

[0009] In one example, the side wall of the current collector where the heat exchange tube is mounted is provided with a first groove, the first groove being isolated from the liquid collection chamber of the current collector, and the end of the pressure strip being inserted into and engaging with the side wall of the first groove.

[0010] In one example, both current collectors are provided with the first groove, and the two ends of one pressure strip respectively engage with the first groove on both sides.

[0011] In one example, the current collector has opposing first and second outer wall surfaces, both of which are parallel to the extension direction of the heat exchange tube, and the first groove penetrates through the first and second outer wall surfaces.

[0012] In one example, the current collector includes a first sidewall and a second sidewall disposed opposite to each other, the heat exchange tube is connected to the first sidewall, the first groove is disposed on the first sidewall, and the thickness of the first sidewall is greater than the thickness of the second sidewall.

[0013] In one example, the liquid cooling assembly has a support side, and the pressure strip has a first surface on the side opposite to the support side. The first surface has a second groove, and the second groove has two groove walls extending along the length direction of the heat exchange tube. The bottom of the second groove has a mounting through hole, and the fixing part includes the mounting through hole.

[0014] In one example, the end of the pressure strip also has a chamfered structure.

[0015] In one example, a support block is also included, located on the support side of the pressure strip;

[0016] Alternatively / and, the support side of the pressure strip is also provided with an avoidance channel.

[0017] In addition, this application embodiment also provides a power battery pack, including a housing and at least one battery cell located inside the housing. The power battery pack also includes the liquid cooling assembly described in any of the above claims, wherein the liquid cooling plate and the pressure strip are both located on the side where the battery cell is provided with the terminal post.

[0018] In one example, it also includes two support beams, both fixed to the inner wall of the box, with the two ends of the pressure strip supported by the two support beams respectively, and both ends of the pressure strip being provided with mounting through holes; the fixing part includes the mounting through holes.

[0019] The fastener passes through the mounting hole and is fixedly connected to the support beam; alternatively, the end of the pressure strip is supported on the support beam by a support block, and the fastener passes through the mounting hole and is fixedly connected to the support block and the support beam.

[0020] This application also provides a vehicle, including a vehicle body, on which the liquid cooling component described in any of the above claims or the power battery pack described above is installed.

[0021] The power battery pack and vehicle in this embodiment both have the above-mentioned liquid cooling components, and therefore also have the above-mentioned technical effects of the liquid cooling components. Attached Figure Description

[0022] Figure 1 This is a partial structural diagram of a power battery pack in one embodiment of this application;

[0023] Figure 2 for Figure 1 The power battery pack shown in the diagram only shows a partial structural schematic of the liquid cooling main body, the first support beam, and the pressure strip;

[0024] Figure 3 for Figure 1 The power battery pack shown in the diagram only shows a partial structural schematic of the liquid cooling body and the pressure strip;

[0025] Figure 4 for Figure 1 The diagram shows the structure of the current collector in the power battery pack.

[0026] Figure 5 for Figure 4 The diagram shows the current collector along its axial direction.

[0027] Figure 6 for Figure 1 Enlarged schematic diagram of the mating position of the pressure strip.

[0028] in, Figures 1 to 6 The one-to-one correspondence between the reference numerals and component names in the attached drawings is as follows:

[0029] 1 box body; 11 supporting beams;

[0030] 2. Liquid cooling body; 21. Current collector; 211. Liquid collection chamber; 212. First groove; 213. Inlet; 214. Second outer wall surface; 215. First side wall; 216. Second side wall; 217. First outer wall surface; 221. First heat exchange tube; 222. Second heat exchange tube; 223. Third heat exchange tube; 224. Fourth heat exchange tube; 23. Liquid inlet; 24. First liquid outlet; 25. Second liquid outlet;

[0031] 3. Pressure strip; 31. End; 32. Second groove; 321. Groove wall; 322. Groove bottom; 323. Chamfered structure; 324. Weight reduction groove; 33. Mounting through hole; 34. Clearance channel; 35. First surface; 36. Second surface;

[0032] 4-cell pack; 41-cell pack;

[0033] 5. Foam; 6. Support block. Detailed Implementation

[0034] In response to the technical problem mentioned in the background art that the addition of a top cooling device leads to a complex internal structure of the power battery pack, this application has conducted in-depth research and found that: to avoid the top cooling device from moving during assembly, positioning brackets are usually set on the current collectors on both sides of the top cooling device. Positioning pins are fixed on the positioning brackets, and the top cooling device is positioned and installed on the fixed beam of the housing by the positioning pins. In addition, for vibration reduction, foam and other components are further provided between the mounting brackets and the fixed beam of the housing.

[0035] The positioning bracket and positioning pin method for positioning the top cooling device is complex in structure, occupies a large space, and may affect the arrangement of internal components such as wiring harnesses and pipes in the power battery pack.

[0036] Therefore, how to overcome the above-mentioned defects is a technical problem that needs to be solved by those skilled in the art.

[0037] This application uses the example of upright mounting of each cell, i.e., the terminal of each cell being located at the top of the cell, to introduce the technical solution and its effects. Of course, it is not excluded that the technical solution provided in this application can be applied to the interior of power battery packs with side-mounted or flip-mounted cells.

[0038] Please refer to Figures 1 to 6 , Figure 1 This is a partial structural diagram of a power battery pack in one embodiment of this application; Figure 2 for Figure 1 The power battery pack shown in the diagram only shows a partial structural schematic of the liquid cooling main body, the first support beam, and the pressure strip; Figure 3 for Figure 1 The power battery pack shown in the diagram only shows a partial structural schematic of the liquid cooling body and the pressure strip; Figure 4 for Figure 1 The diagram shows the structure of the current collector in the power battery pack. Figure 5 for Figure 4 The diagram shows the current collector along its axial direction. Figure 6 for Figure 1 Enlarged schematic diagram of the mating position of the pressure strip.

[0039] This application provides a power battery pack, which includes a housing 1 and a plurality of battery cells 41 located inside the housing 1. The battery cells 41 are stacked along the x-direction to form a cell group 4. (See reference...) Figure 1Understood. The number of cells in a single cell group 4 depends on the specific product. The housing 1 can contain one cell group 4, or at least two cell groups 4 arranged along the y-direction. Each cell 41 has a positive terminal and a negative terminal. The terminals of all cells can be connected in series or / and in parallel via busbars according to rules to form a power supply. The positive and negative terminals can be made of single-component materials, such as copper or aluminum, which have good conductivity, or composite materials of different components, such as copper-aluminum composite materials with good conductivity, as long as good conductivity is achieved.

[0040] In this embodiment, the power battery pack further includes a liquid cooling assembly, which includes a liquid cooling body 2 and a pressure strip 3. The liquid cooling body 2 and the pressure strip 3 can be installed on one side of the cell 41 in each cell group 4 where the terminal post is located. In the embodiment where the terminal post is located on the top of the cell 41, the liquid cooling body 2 and the pressure strip 3 are installed on the top of each cell group 4.

[0041] In this embodiment, the liquid-cooled body 2 includes two current collectors and a heat exchange tube located between them. Each current collector has a collection chamber, and the two ends of the heat exchange tube are connected to the collection chambers of the two current collectors. The two current collectors can be rectangular tubes with a rectangular cross-section, which reduces the overall height of the liquid-cooled body 2. Of course, in some embodiments, the cross-sections of the two current collectors can also be other shapes, such as circular tubes, which have lower fluid resistance. The two current collectors can also have different shapes, depending on the specific product.

[0042] The liquid collection chambers 211 of the two current collectors 21 are connected by heat exchange tubes to allow the fluid medium to flow between them. The main function of the heat exchange tubes is to exchange heat between the liquid inside the tubes and the flow elements (electrodes, busbars) of the battery cell 41. A socket 213 can be provided on the current collector 21, and the heat exchange tube is inserted and fixed inside the socket 213. The heat exchange tube can be fixedly connected to the current collector by brazing. There can be one or two heat exchange tubes between the two current collectors 21. When there are two or more heat exchange tubes, there can be a gap between adjacent heat exchange tubes. During installation, the heat exchange tubes are usually located directly above the electrode. The fluid inside the heat exchange tubes can exchange heat with the electrode to cool or heat it. Typically, one heat exchange tube in the liquid cooling body 2 corresponds to one row of electrode columns. A heat exchange tube can have one fluid channel inside, or it can have two or more relatively independent fluid channels; such heat exchange tubes are also called harmonica tubes. The heat exchange tube can also have a rectangular cross-section, or other structures.

[0043] At least one of the two collectors 21 is provided with an inlet and an outlet. In this embodiment, a specific structure of the collector 21 is shown: one of the two collectors is provided with an inlet 23, a first outlet 24 and a second outlet 25, and the other is a structure closed at both ends (not shown in the figures). The fluid flow path in the four heat exchange tubes is as follows: the fluid enters the inside of the collector 21 through the inlet 23, part of it flows into the first heat exchange tube 221 and the second heat exchange tube 222 through the liquid distribution chamber inside the collector 21, reaches the liquid collection chamber 211 of the opposite collector 21, then enters the third heat exchange tube 223 and flows back into the collector 21, and then flows out through the second outlet 25. In addition, another part of the fluid that enters the inside of the collector 21 through the inlet 23 flows into the second heat exchange tube 222, reaches the liquid collection chamber of the opposite collector, then enters the fourth heat exchange tube 224 and flows back into the collector 21, and then flows out through the first outlet 24.

[0044] Of course, the arrangement of the inlet and outlet of the current collector 21 is not limited to the above description and can also be in other forms.

[0045] In this embodiment, the pressure strip 3 primarily positions the battery cell assembly 4 in the height direction (z-direction) to fix the battery cell assembly 4 within the housing 1. The pressure strip 3 has fixing parts, allowing it to be fixed to the housing 1. The fixing parts can be located at both ends of the pressure strip 3, which can be supported inside the housing 1. In a specific example, the housing 1 typically has two support beams 11 located on either side of the battery cell assembly along the arrangement direction (x-direction). The pressure strip 3 is supported by the fixing parts at both ends of the two support beams 11, and the pressure strip 3 abuts against the top of the battery cell 41 to define the z-direction position of the battery cell. The fixing parts can be mounting through holes, welded parts, snap-fit, or riveted to the support beams 11 of the housing.

[0046] Specifically, the pressure strip 3 can be fixed to the support beam 11 by bolts. In one example, the pressure strip 3 can be located between adjacent heat exchange tubes, which can make full use of the space between adjacent heat exchange tubes, which helps to reduce the overall thickness of the liquid cooling component and thus reduce the height of the power battery pack along the z-direction.

[0047] As mentioned above, the pressure strip 3 and the liquid cooling body 2 are located on the same side of the battery cell 41. Figure 1In the illustrated embodiment, both the pressure strip 3 and the liquid cooling body 2 are located on top of the battery cell 41. The pressure strip 3 extends in the same direction as the heat exchange tube, and its end 31 engages with the outer wall of at least one current collector 21. That is, the pressure strip 3 can engage with the outer wall of one current collector, and both ends of the pressure strip 3 can engage with the corresponding outer walls of the current collectors on both sides. The outer wall of the current collector 21 and the pressure strip 3 can each have a protrusion and a groove, with the protrusion inserted into the groove, and the two engaging to limit movement. When the outer wall of the current collector 21 is a groove, the groove is isolated from the liquid collection chamber inside the current collector 21 and is not connected. The attached figure shows an embodiment where a groove is provided on the outer wall of the current collector 21.

[0048] Compared with the existing technology that specifically sets positioning brackets and positioning pins on the current collector, the embodiment of this application directly designs the pressure strip 3 and the current collector 21 in a concave-convex fit, which can realize the positioning of the current collector 21 in one or several directions inside the housing 1 without the need for additional components, reducing costs and simplifying the positioning structure of the liquid cooling body 2 in the housing 1. This not only improves the system integration and reduces the overall weight of the power battery pack, but also provides space for optimized design of electrical components and pipelines inside the power battery pack, further improving the overall performance of the power battery pack.

[0049] In one embodiment, the side wall of the heat exchange tube mounted on the current collector 21 is provided with a first groove 212. The first groove 212 is isolated from the liquid collection cavity of the current collector and is not in communication with the liquid collection cavity, that is, the first groove 212 cannot penetrate into the liquid collection cavity 211. The bottom wall of the first groove 212 and the liquid collection cavity 211 have a predetermined thickness to avoid leakage of the liquid collection cavity. The end of the pressure strip 3 is inserted into and mates with the side wall of the first groove 212. The cross-section of the pressure strip 3 is usually rectangular, so the first groove 212 can be a rectangular groove. Of course, it is not excluded that the pressure strip 3 and the first groove 212 are of other shapes.

[0050] In this embodiment, a groove is provided on the current collector 21, and the pressure strip 3 is inserted into the groove for limiting. The structure is relatively simple and easy to implement in terms of process.

[0051] Specifically, both current collectors 21 are provided with a first groove 212, and the two ends of a pressure strip 3 respectively mate with the first grooves 212 on both sides. (See attached image) Figure 1 and Figure 2 Only one structure is shown where the current collector 21 and one end of the pressure strip 3 are engaged; the structure of the other current collector and the other end of the pressure strip 3 is similar. In this embodiment, the position of the liquid cooling body 2 along the x and y directions can be constrained by the first groove 212 on the two current collectors and the two ends of the pressure strip 3, resulting in high positioning reliability.

[0052] The first groove 212 can be located on the pipe section where the collector is located between adjacent heat exchange tubes, or the first groove 212 can be located on the end pipe section of the collector.

[0053] In this embodiment, the current collector 21 has a first outer wall surface 217 and a second outer wall surface 214, both of which are parallel to the extension direction of the heat exchange tube. When assembled into a power battery pack, the second outer wall surface 214 faces the battery cell, the first outer wall surface 217 is the surface of the current collector facing away from the battery cell, and the first groove 212 penetrates through the first outer wall surface 217 and the second outer wall surface 214. That is, the first groove 212 is a through groove extending along the z-direction, which facilitates the processing of the first groove 212 and also facilitates the insertion and mating with the pressure strip 3. For example, the pressure strip 3 can be first installed on the support beam 11, and then inserted into the first groove 212 from the end of the first groove 212 near the battery cell 41.

[0054] In this embodiment, the current collector 21 includes a first sidewall 215 and a second sidewall 216 disposed opposite to each other. A heat exchange tube is connected to the first sidewall 215. As shown in the figure, the first sidewall 215 is provided with an insertion port 213, corresponding one-to-one with the heat exchange tube, which is inserted into the interior of the first sidewall 215. A first groove 212 is provided in the first sidewall 215, and the thickness L1 of the first sidewall 215 is greater than the thickness L2 of the second sidewall 216. The thickness directions of the first and second sidewalls are the extension directions of the heat exchange tube, i.e., the x-direction. The liquid collecting chamber in this application is asymmetrical about the central axis of the current collector, i.e., the liquid collecting chamber is offset.

[0055] In this embodiment, the thickness of the first sidewall 215 with the first groove 212 is greater than the wall thickness of other positions of the current collector 21. Thus, after the groove is formed on the first sidewall 215, the strength is relatively high, ensuring the overall strength of the current collector 21.

[0056] In this embodiment, the liquid cooling assembly has a support side, which is defined as the side of the liquid cooling assembly supported on the housing 1, facing the battery cell 41. The pressure strip 3 has a first surface 35 on the side facing away from the support side; that is, the pressure strip 3 includes a first surface 35 facing away from the battery cell 41. The first surface 35 has a second groove 32, which has two groove walls 321 extending along the length of the heat exchange tube. The bottom 322 of the second groove 32 has a mounting through hole 33, and the fixing part includes the mounting through hole 33. The mounting through hole 33 is used to install a fastener connected to the housing 1, which may include bolts and washers.

[0057] In the above embodiments, the second groove 32 can provide installation space for the fastener, reduce the installation height of the fastener to a certain extent, and the groove walls 321 on both sides can provide positioning for the fastener.

[0058] In this embodiment, the end of the pressure strip 3 also has a chamfered structure 323, which allows the pressure strip 3 to be smoothly inserted into the first groove 212.

[0059] Compared with the current collector, the thickness of the pressure strip 3 is relatively low. In order to reliably insert the pressure strip 3 into the first groove 212, a support block 6 can be further provided on the pressure strip 3. The support block 6 is located on the second surface 36 of the pressure strip 3 facing the battery cell. That is to say, the support block 6 is provided on the support side of the pressure strip 3. The pressure strip 3 is supported inside the housing 1 by the support block 6. Specifically, the pressure strip 3 is supported on the support beam 11 by the support block 6.

[0060] In addition, the support block 6 can raise the position of the pressure bar 3 and avoid other structures on the battery cell 41.

[0061] For the sake of brevity in describing the technical solution, this embodiment includes two support beams 11, both fixed to the inner wall of the housing 1. Two current collectors are respectively supported by the two support beams 11, and the two ends of the pressure strip 3 are respectively supported by the two support beams 11. In other words, the two support beams 11 are defined as the first support beam and the second support beam, both fixed to the inner wall of the housing 1, and the two ends of the pressure strip 3 are respectively supported by the first support beam and the second support beam. Of course, the two current collectors can also be supported by the first support beam and the second support beam respectively.

[0062] The first and second support beams can have the same structure or different structures, depending on their specific positions within the box.

[0063] The ends of the pressure strip 3 can be directly supported on the support beam 11. In one example, both ends of the pressure strip 3 are provided with mounting through holes 33. A fastener can pass through the mounting through holes 33 and be fixedly connected to the support beam 11. Specifically, the support beam 11 is provided with a connecting hole (not shown in the attached figure) coaxially arranged with the mounting through hole 33 on the corresponding side. When the pressure strip 3 and the support beam 11 are fixed, the fastener is simultaneously located inside the mounting through hole 33 and the connecting hole to fix the pressure strip 3 to the support beam 11. That is, the pressure strip 3 and the support beam 11 are connected and fixed by a fastener located inside the mounting through hole 33 and the connecting hole. In this embodiment, the pressure strip 3 directly supports and fixes the support beam 11, resulting in a relatively simple structure.

[0064] Of course, as mentioned above, support blocks 6 can also be provided at both ends of the pressure strip 3. The pressure strip 3 is supported on the support beam 11 by the support blocks 6. The support blocks 6 can be pre-fixed to the pressure strip 3 to form an integral unit, or they can be pre-fixed to the support beam 11 to form an integral unit. Alternatively, the support blocks 6 can be a separate component before the pressure strip 3 and the support beam 11 are assembled. During the assembly of the pressure strip 3 and the support beam 11, the pressure strip 3, support blocks 6, and support beam 11 are fixed by fasteners. In one example, when the support blocks 6 are pre-fixed to the pressure strip 3, the support blocks 6 can be provided with a central through hole (not shown in the figure). The fasteners pass through the mounting through hole 33 of the pressure strip and the central through hole of the support blocks 6 and are connected and fixed inside the connecting hole of the support beam 11 to achieve the fixation of the pressure strip 3 and the support beam 11. When the support blocks 6 are pre-fixed to the support beam 11, the support blocks 6 can be provided with a central through hole. Of course, when the strength of the support blocks 6 meets the requirements, the fasteners can also be directly connected to the support blocks 6.

[0065] In this embodiment, the structure of mounting through holes 33 on the pressure strip 3 is simple, and the support block 6 can adjust the installation height of the pressure strip 3 to meet the usage requirements of different environments.

[0066] In the above embodiments, the fastener can be a mechanical component such as a bolt or screw.

[0067] In addition to fixing the liquid cooling body 2 and the pressure bar 3, the two support beams 11 can also clamp each battery cell 4 between the two support beams 11, that is, the two support beams 11 can clamp and position the battery cell 4 along the x direction.

[0068] In addition, the second surface 36 of the pressure strip 3 can also be provided with a clearance channel 34 to provide clearance space for components such as busbars on the battery cell. The first surface 35 of the pressure strip 3 can also be further provided with foam 5 to make elastic contact with the top cover on the housing 1.

[0069] Furthermore, a weight-reducing groove 324 can be provided on the pressure strip 3 to reduce the weight of the pressure strip 3.

[0070] The power battery pack provided in this application embodiment can be applied to a vehicle, which includes a vehicle body, and the housing 1 is installed on the vehicle body. Of course, the power battery pack can also be applied to other power consumption environments.

[0071] For other structural details regarding the vehicle and battery pack, please refer to current technology; this application will not elaborate further.

[0072] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0073] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0074] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A liquid cooling assembly, characterized in that, include: The liquid cooling body includes two current collectors and a heat exchange tube located between the two current collectors; The pressure strip extends in the same direction as the heat exchange tube, and the end of the pressure strip is in concave-convex fit with the outer wall of at least one of the current collectors. The pressure strip also has a fixing part.

2. The liquid cooling assembly according to claim 1, characterized in that, The heat exchange tube is mounted on a side wall of the current collector, which has a first groove. The first groove is isolated from the liquid collection chamber of the current collector, and the end of the pressure strip is inserted into and engages with the side wall of the first groove.

3. The liquid cooling assembly according to claim 2, characterized in that, The current collector has a first outer wall surface and a second outer wall surface that are opposite each other. The first outer wall surface and the second outer wall surface are parallel to the extension direction of the heat exchange tube. The first groove penetrates the first outer wall surface and the second outer wall surface.

4. The liquid cooling assembly according to claim 2 or 3, characterized in that, The current collector includes a first sidewall and a second sidewall disposed opposite to each other. The heat exchange tube is connected to the first sidewall. The first groove is disposed on the first sidewall. The thickness of the first sidewall is greater than the thickness of the second sidewall.

5. The liquid cooling assembly according to any one of claims 1 to 3, characterized in that, The liquid cooling assembly has a support side, and the pressure strip has a first surface on the side away from the support side. The first surface has a second groove, and the second groove has two groove walls extending along the length direction of the heat exchange tube. The bottom of the second groove has a mounting through hole, and the fixing part includes the mounting through hole.

6. The liquid cooling assembly according to any one of claims 1 to 3, characterized in that, The ends of the pressure strip also have a chamfered structure.

7. The liquid cooling assembly according to any one of claims 1 to 3, characterized in that, It also includes a support block located on the support side of the pressure strip; Alternatively / and, the support side of the pressure strip is also provided with an avoidance channel.

8. A power battery pack, characterized in that, The power battery pack includes a housing and at least one battery cell located inside the housing. The power battery pack also includes a liquid cooling assembly as described in any one of claims 1 to 7, wherein the liquid cooling plate and the pressure strip are both located on the side where the battery cell is provided with a terminal post.

9. The power battery pack according to claim 8, characterized in that, It also includes two support beams, both fixed to the inner wall of the box body. The two ends of the pressure strip are respectively supported by the two support beams. Both ends of the pressure strip are provided with mounting through holes. The fixing part includes the mounting through holes. The fastener passes through the mounting hole and is fixedly connected to the support beam; alternatively, the end of the pressure strip is supported on the support beam by a support block, and the fastener passes through the mounting hole and is fixedly connected to the support block and the support beam.

10. A vehicle, characterized in that, The vehicle body is equipped with a liquid cooling assembly as described in any one of claims 1 to 7, or a power battery pack as described in claim 8 or 9.

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