Liquid cooling assembly and battery pack

Abstract

This application provides a liquid cooling assembly and a battery pack, specifically relating to the field of battery technology. The liquid cooling assembly includes a cold plate and a connecting portion. Several cold plates are arranged side-by-side along a first direction, with a battery cell unit located between every two cold plates. The connecting portion is located at one end of a cold plate in a second direction and protrudes from at least one side of the cold plate in the first direction; the connecting portions of the cold plates are interconnected. The cold plate includes a liquid cooling region and a phase change region. The liquid cooling region includes a first liquid cooling channel and a second liquid cooling channel, which are spaced apart along a third direction and both are connected to the connecting portion, forming a U-shaped liquid cooling circuit. The phase change region is located between the first and second liquid cooling channels. Utilizing the efficient phase change heat transfer principle of direct refrigerant cooling at low temperature differences, combined with liquid cooling for heat dissipation, efficient cooling is achieved at the initial temperature rise of the battery pack, effectively improving the heat exchange efficiency of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a liquid cooling component and a battery pack. Background Technology

[0002] With technological advancements and increasing demand for renewable energy, battery packs are widely used in various fields, including electric vehicles, renewable energy storage, consumer electronics, and industrial equipment. As power density continues to increase, thermal management becomes a critical issue. Overheating can lead to performance degradation, reduced reliability, and even damage to battery packs.

[0003] To meet the requirements of battery packs, liquid cooling or direct refrigerant cooling is typically used. The battery pack may include a liquid cooling system, in which coolant is injected to maintain normal operation and extend its lifespan.

[0004] However, in existing battery packs, liquid cooling solutions only achieve significant heat transfer when there is a large temperature difference between the coolant and the battery. During the initial temperature rise phase of the battery, the small temperature difference limits the effectiveness of liquid cooling, especially in ultra-fast charging systems where the short charging time exacerbates its disadvantages, limiting it to supporting thermal equilibrium only at high temperatures. Conversely, direct cooling solutions, which typically rely on liquid-to-gas transitions, provide noticeable cooling during the initial temperature rise, but suffer from high technical barriers, complex temperature difference control, and difficult maintenance. Utility Model Content

[0005] This application provides a liquid cooling component and a battery pack. Utilizing the efficient phase change heat transfer principle of direct refrigerant cooling at low temperature differences, combined with liquid cooling for heat dissipation, efficient cooling can be achieved even during the initial temperature rise of the battery pack, effectively improving the heat exchange efficiency of the battery pack throughout the entire operating range.

[0006] The first aspect of this application provides a liquid cooling assembly, comprising:

[0007] Cold plate, several cold plates are arranged side by side along a first direction, and a cell unit is provided between every two cold plates;

[0008] A connecting portion is located at one end of the cold plate in the second direction, and the connecting portion protrudes in the first direction and is disposed on at least one side of the cold plate, and the connecting portions of each cold plate are connected to each other.

[0009] The cold plate includes a liquid cooling region and a phase change region. The liquid cooling region includes a first liquid cooling channel and a second liquid cooling channel. The first liquid cooling channel and the second liquid cooling channel are spaced apart along a third direction, and both the first liquid cooling channel and the second liquid cooling channel are connected to the connecting part to form a U-shaped liquid cooling circuit. The phase change region is located between the first liquid cooling channel and the second liquid cooling channel.

[0010] The liquid cooling assembly provided in the first aspect of this application includes a cold plate and a connecting portion. A plurality of cold plates are arranged side-by-side along a first direction, with a battery cell unit located between every two cold plates. The connecting portion is located at one end of a cold plate in a second direction and protrudes from at least one side of the cold plate in the first direction; the connecting portions of the various cold plates are interconnected. Each cold plate includes a liquid cooling region and a phase change region. The liquid cooling region includes a first liquid cooling channel and a second liquid cooling channel, which are spaced apart along a third direction and both are connected to the connecting portion, forming a U-shaped liquid cooling circuit. The phase change region is located between the first and second liquid cooling channels. Thus, the liquid cooling assembly provided in this application utilizes the efficient phase change heat transfer principle of direct refrigerant cooling at low temperature differences, combined with liquid cooling for heat dissipation, achieving efficient cooling even at the initial temperature rise of the battery pack, effectively improving the heat exchange efficiency of the battery pack throughout its entire operating range.

[0011] In one possible implementation, the cold plate has a flow collection cavity at both ends in the second direction, and the connecting part is provided on one of the flow collection cavities and communicates with the flow collection cavity.

[0012] In one possible implementation, the connection includes an inlet end and an outlet end, which are spaced apart along a third direction.

[0013] The liquid inlet is connected to one of the first liquid cooling channel and the second liquid cooling channel through the collection cavity, and the liquid outlet is connected to the other of the first liquid cooling channel and the second liquid cooling channel through the collection cavity.

[0014] In one possible implementation, a partition plate is also provided in the collection cavity with the connecting part. The partition plate separates the liquid inlet end and the liquid outlet end so that the liquid inlet end, the liquid outlet end, the collection cavity, the first liquid cooling channel and the second liquid cooling channel together form a U-shaped liquid cooling circuit.

[0015] In one possible implementation, the cold plate is provided with heat dissipation plates at both ends in the first direction, the heat dissipation plates are fixedly connected to the outer surface of the manifold in the second direction, and the heat dissipation plates are fixedly connected to the liquid cooling area in the third direction.

[0016] The first and second liquid cooling channels, together with the heat spreader, form a sealed cavity, and the phase change region is located in the sealed cavity.

[0017] In one possible implementation, one of the heat spreaders has a liquid injection hole that is connected to a sealed cavity for injecting a phase change medium.

[0018] In one possible implementation, the injection height of the phase change medium ranges from 1 / 3 to 9 / 10 of the height of the sealed cavity.

[0019] In one possible implementation, it further includes: a sealing sheet disposed on the injection hole;

[0020] The sealing strip is used to seal the injection hole after the phase change medium is injected into the sealed cavity.

[0021] A second aspect of this application provides a battery pack, including a battery module and the liquid cooling assembly described above;

[0022] The battery module is in contact with the liquid cooling component.

[0023] In one possible implementation, the battery module includes several battery cell units;

[0024] The cell unit includes two surfaces disposed opposite each other along a first direction, at least one of which is in contact with the cold plate of the liquid cooling assembly.

[0025] It should be understood that the second aspect of this application corresponds to the technical solution of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here.

[0026] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems solved by the liquid cooling component and battery pack provided by this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 An exploded view of the liquid cooling assembly provided in an embodiment of this application;

[0029] Figure 2 A cross-sectional view of the liquid cooling assembly provided in an embodiment of this application in a second direction;

[0030] Figure 3 A cross-sectional view of the liquid cooling assembly provided in an embodiment of this application from a third-party perspective;

[0031] Figure 4 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0032] Figure 5 A side view of a battery pack provided in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100 - Liquid cooling assembly;

[0035] 200 - Cold plate; 210 - Liquid cooling area; 211 - First liquid cooling channel; 212 - Second liquid cooling channel; 213 - Manifold; 2131 - Main manifold; 2132 - Auxiliary manifold; 214 - Partition plate; 215 - Heat spreader; 216 - Liquid injection hole; 217 - Sealing plate; 218 - Insulating component; 219 - Rib break structure; 220 - Phase change area; 230 - Sealed cavity;

[0036] 300 - Connecting part; 310 - Liquid inlet; 320 - Liquid outlet;

[0037] 400-battery pack;

[0038] 500 - Battery module; 510 - Battery cell unit. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] As described in the background section, in existing battery packs, liquid cooling solutions only achieve significant heat transfer when there is a large temperature difference between the coolant and the battery. During the initial temperature rise phase of the battery, the small temperature difference limits the effectiveness of liquid cooling, especially in ultra-fast charging systems where the short charging time exacerbates its disadvantages, limiting it to supporting thermal equilibrium only at high temperatures. Conversely, direct cooling solutions typically rely on the liquid-to-gas transition, providing noticeable cooling during the initial temperature rise. However, this approach is prone to issues such as high technical barriers, complex temperature difference control, and difficult maintenance.

[0041] To address the aforementioned technical problems, a first aspect of this application provides a liquid cooling assembly. This liquid cooling assembly includes cold plates and connecting portions. Several cold plates are arranged side-by-side along a first direction, with a battery cell unit located between every two cold plates. The connecting portion is located at one end of a cold plate in a second direction and protrudes from at least one side of the cold plate in the first direction; the connecting portions of the cold plates are interconnected. Each cold plate includes a liquid cooling region and a phase change region. The liquid cooling region includes a first liquid cooling channel and a second liquid cooling channel, which are spaced apart along a third direction and both are connected to the connecting portion, forming a U-shaped liquid cooling circuit. The phase change region is located between the first and second liquid cooling channels. Thus, the liquid cooling assembly provided by this application utilizes the efficient phase change heat transfer principle of direct refrigerant cooling at low temperature differences, combined with liquid cooling for heat dissipation, achieving efficient cooling even at the initial temperature rise of the battery pack, effectively improving the heat exchange efficiency of the battery pack throughout its operating range.

[0042] A second aspect of this application provides a battery pack. The battery pack includes a battery module and the aforementioned liquid cooling assembly. The battery module is in contact with the liquid cooling assembly.

[0043] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] This application provides a liquid cooling component and a battery pack. Utilizing the efficient phase change heat transfer principle of direct refrigerant cooling under low temperature differences, combined with liquid cooling for heat dissipation, efficient cooling can be achieved even during the initial temperature rise of the battery pack, effectively improving the heat exchange efficiency of the battery pack throughout the entire operating range. The specific structure of the liquid cooling component and battery pack provided in this application embodiment is described below with reference to the accompanying drawings.

[0045] refer to Figure 1 This application provides a liquid cooling assembly 100 in a first aspect. The liquid cooling assembly 100 may include a cold plate 200 and a connecting portion 300. In one possible implementation, the number of cold plates 200 and connecting portions 300 may be plurality of; this application embodiment does not limit the number of cold plates 200 and connecting portions 300. In this application embodiment, as... Figure 4As shown, several cold plates 200 can be arranged side by side along a first direction, and a battery cell unit 510 can be provided between every two cold plates 200. The cold plates 200 contact the battery cell unit 510, thereby dissipating heat from the battery cell unit 510. Additionally, a connecting portion 300 can be located at one end of the cold plate 200 in a second direction, and the connecting portion 300 can protrude from at least one side of the cold plate 200 in the first direction. In this embodiment, the connecting portions 300 of each cold plate 200 are interconnected, thereby allowing several cold plates 200 to be arranged in parallel as a whole within the battery pack 400.

[0046] Continue to refer to Figure 4 Based on the above embodiments, the plurality of cold plates 200 can have various forms. In one possible implementation, the cold plate 200 may include end cold plates and middle cold plates. The number of end cold plates can be two, and the number of middle cold plates can be several; this application embodiment does not impose any limitation. In this application embodiment, the plurality of middle cold plates can be located between two end cold plates. The end cold plates have a connecting portion 300 on the side facing the middle cold plates, and the middle cold plates have connecting portions 300 on both sides in the first direction, thereby allowing adjacent cold plates 200 to be connected via the connecting portions 300.

[0047] Continue to refer to Figure 1 Based on the above embodiments, the cold plate 200 may include a liquid-cooled region 210 and a phase-change region 220. Further, the liquid-cooled region 210 may include a first liquid-cooled channel 211 and a second liquid-cooled channel 212. The first liquid-cooled channel 211 and the second liquid-cooled channel 212 may be spaced apart along a third direction, and both the first liquid-cooled channel 211 and the second liquid-cooled channel 212 may be connected to the connecting portion 300, thereby forming a U-shaped liquid-cooled circuit. Additionally, the phase-change region 220 may be located between the first liquid-cooled channel 211 and the second liquid-cooled channel 212. In this embodiment, the phase-change region 220 may contain a phase-change medium, thereby facilitating heat exchange with the battery cell unit 510.

[0048] Thus, the liquid cooling component 100 provided in this application embodiment utilizes the efficient phase change heat transfer principle of direct cooling with refrigerant at low temperature difference, and combines liquid cooling for heat dissipation, so as to achieve efficient cooling at the initial temperature rise of the battery pack 400, effectively improving the heat exchange efficiency of the battery pack 400 in the entire operating range.

[0049] It should be noted that, for ease of description, in this embodiment, the first direction can be the thickness direction of the cold plate 200, i.e. Figure 1 The x-direction. The second direction can be the length direction of the 200mm cold plate, i.e. Figure 1 The y-direction. The third direction can be the height direction of the cold plate (200mm), i.e. Figure 1 The z-direction in the equation.

[0050] Continue to refer to Figure 1 Based on the above embodiments, the cold plate 200 may have flow collection cavities 213 at both ends in the second direction, and the flow collection cavities 213 may be connected to the first liquid cooling channel 211 and the second liquid cooling channel 212 respectively. In one possible embodiment, the connecting part 300 may be provided on one of the flow collection cavities 213 and may be connected to the flow collection cavity 213, thereby enabling the connecting part 300 to be connected to the first liquid cooling channel 211 and the second liquid cooling channel 212 through the flow collection cavity 213.

[0051] Continue to refer to Figure 1 Based on the above embodiments, the connecting portion 300 may further include a liquid inlet end 310 and a liquid outlet end 320. The liquid inlet end 310 and the liquid outlet end 320 may be spaced apart along a third direction. In one possible implementation, the liquid inlet end 310 may be connected to one of the first liquid cooling channel 211 and the second liquid cooling channel 212 via the collection cavity 213, while the liquid outlet end 320 may be connected to the other of the first liquid cooling channel 211 and the second liquid cooling channel 212 via the collection cavity 213.

[0052] In one possible implementation, the liquid inlet 310 can be connected to the first liquid cooling channel 211 via the manifold 213, while the liquid outlet 320 can be connected to the second liquid cooling channel 212 via the manifold 213. Alternatively, in another possible implementation, the liquid inlet 310 can be connected to the second liquid cooling channel 212 via the manifold 213, while the liquid outlet 320 can be connected to the first liquid cooling channel 211 via the manifold 213. The embodiments described in this application are not intended to be limiting.

[0053] refer to Figure 2 Based on the above embodiment, a partition plate 214 may also be provided in the collection cavity 213 with the connecting part 300. The partition plate 214 can separate the liquid inlet end 310 and the liquid outlet end 320, so that the liquid inlet end 310, the liquid outlet end 320, the collection cavity 213, the first liquid cooling channel 211 and the second liquid cooling channel 212 together form a U-shaped liquid cooling circuit.

[0054] In one possible implementation, such as Figure 1As shown, the collector cavity 213 may include a main collector cavity 2131 and an auxiliary collector cavity 2132. The collector cavity 213 with the connecting portion 300 and the partition plate 214 is the main collector cavity 2131, and the other collector cavity 213 is the auxiliary collector cavity 2132. In this embodiment, the inlet end 310 is connected to the first liquid cooling channel 211, and the outlet end 320 is connected to the second liquid cooling channel 212. It can be understood that the coolant can enter the first liquid cooling channel 211 through the inlet end 310 and along the main collector cavity 2131, then flow along the auxiliary collector cavity 2132 to the second liquid cooling channel 212, and finally flow out through the outlet end 320 along the main collector cavity 2131, thereby allowing the coolant to flow in the U-shaped liquid cooling circuit and cool the battery cell unit 510.

[0055] In the embodiments of this application, it can be understood that by offsetting the temperatures of the first liquid cooling channel 211 and the second liquid cooling channel 212, a large temperature difference is avoided between the first and last battery cell units 510, which can effectively ensure the temperature uniformity of the entire battery cell unit 510 and improve the cycle life of the battery cell unit 510.

[0056] Continue to refer to Figure 1 Based on the above embodiments, the liquid cooling assembly 100 may further include a heat spreader 215. In one possible implementation, the number of heat spreaders 215 may be at least two, and this application embodiment does not impose a limitation. In this application embodiment, the cold plate 200 may have heat spreaders 215 at both ends in the first direction. The two ends of the heat spreaders 215 along the second direction may be fixedly connected to the outer surface of the manifold 213, while the two ends of the heat spreaders 215 along the third direction may be fixedly connected to the liquid cooling region 210.

[0057] Thus, it is understandable that, Figure 3 As shown, at least a portion of the outer surface of the first liquid cooling channel 211 and at least a portion of the outer surface of the second liquid cooling channel 212, together with at least a portion of the inner surface of the heat spreader 215, can jointly enclose a sealed cavity 230, and the phase change region 220 can be located within the sealed cavity 230. In one possible embodiment, the heat spreader 215 can be fixedly connected to the cold plate 200 by welding, and this embodiment of the application is not limited thereto.

[0058] Continue to refer to Figure 1 Based on the above embodiments, one of the heat spreaders 215 may have a liquid injection hole 216, and the liquid injection hole 216 may be connected to the sealed cavity 230. In the embodiments of this application, it can be understood that the liquid injection hole 216 can be used to inject a phase change medium, thereby allowing the phase change medium to be injected into the sealed cavity 230.

[0059] Continue to refer to Figure 3 Based on the above embodiments, in one possible implementation, the injection height of the phase change medium is less than the height of the sealed cavity 230. In this embodiment, exemplarily, the injection height of the phase change medium can range from 1 / 3 to 9 / 10 of the height of the sealed cavity 230. Thus, it can be understood that, since the sealed cavity 230 cooperates with the first liquid cooling channel 211 and the second liquid cooling channel 212, it may deform, and through its own deformation, provide a certain space for the expansion of the cell unit 510. Therefore, the sealed cavity 230 cannot be completely filled with liquid phase change medium.

[0060] Continue to refer to Figure 1 Based on the above embodiments, the liquid cooling assembly 100 may further include a sealing sheet 217. The sealing sheet 217 may be disposed on the injection hole 216. In this embodiment, it is understood that the sealing sheet 217 can be used to seal the injection hole 216 after the phase change medium is injected into the sealed cavity 230. In one possible implementation, after injection is completed, the sealing sheet 217 can be welded to the injection hole 216 to prevent the phase change medium from flowing out of the sealed cavity 230.

[0061] Continue to refer to Figure 1 Based on the above embodiments, the liquid cooling assembly 100 may further include an insulating member 218. In one possible implementation, the number of insulating members 218 may be two, and this application embodiment does not impose a limitation. In this application embodiment, the two insulating members 218 may be located at both ends of the heat spreader 215 in the first direction. It is understood that the sealing sheet 217 can be used to prevent short circuits and achieve electrical isolation of the liquid cooling assembly 100.

[0062] Continue to refer to Figure 3 Based on the above embodiments, the interior of the first liquid cooling channel 211 and the second liquid cooling channel 212 may be provided with a rib-breaking structure 219. In one possible implementation, the rib-breaking structure 219 may protrude from the inner surface of the first liquid cooling channel 211 and / or the second liquid cooling channel 212. It is understood that the rib-breaking structure 219 prevents excessive deformation of the cold plate 200, which could lead to crushing of the cold plate 200 and blockage of the coolant, resulting in uneven cooling of the battery cell 510 and consequently, excessive temperature difference in the battery cell 510, affecting cooling performance.

[0063] refer to Figure 4 as well as Figure 5This application provides a battery pack 400 in a second aspect. The battery pack 400 may include battery modules 500 and the aforementioned liquid cooling assembly 100. In one possible implementation, the number of battery modules 500 can be plurality of, and this application embodiment does not limit the number of battery modules 500. In this application embodiment, plurality of battery modules 500 can be stacked in the battery pack 400, and the battery modules 500 can be in contact with the liquid cooling assembly 100, thereby allowing the liquid cooling assembly 100 to dissipate heat from the battery modules 500.

[0064] Continue to refer to Figure 4 Based on the above embodiments, the battery module 500 may further include a cell unit 510. In one possible implementation, the number of cell units 510 can be several; this application embodiment does not limit the number of cell units 510. In this application embodiment, the cell unit 510 may include two surfaces. The two surfaces may be arranged opposite to each other along a first direction, and at least one surface may be in contact with the cold plate 200 of the liquid cooling assembly 100.

[0065] In one possible implementation, the cell unit 510 may have a cold plate 200 of the liquid cooling assembly 100 on both surfaces along the first direction, such that both surfaces of the cell unit 510 are in contact with the cold plate 200. Alternatively, in another possible implementation, the cell unit 510 may have a cold plate 200 of the liquid cooling assembly 100 on one surface along the first direction, such that one surface of the cell unit 510 is in contact with the cold plate 200. The embodiments described in this application are not intended to be limiting.

[0066] In this embodiment of the application, the liquid cooling component 100 provided in this embodiment of the application utilizes the efficient phase change heat transfer principle of refrigerant direct cooling under low temperature difference, and combines liquid cooling for heat dissipation, so as to achieve efficient cooling at the initial temperature rise of the battery pack 400, effectively improving the heat exchange efficiency of the battery pack 400 in the entire operating range.

[0067] In this embodiment, combining direct cooling and liquid cooling under ultra-fast charging conditions can further reduce fast charging time and improve heat dissipation efficiency. Furthermore, the liquid cooling component 100 has a simple structure, is easy to manufacture, and exhibits high temperature uniformity in the battery cell 510, effectively improving the lifespan of the battery cell 510.

[0068] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0069] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0070] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0071] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0072] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0073] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A liquid cooling assembly, characterized in that, include: Cold plate (200), a plurality of said cold plates (200) are arranged side by side along a first direction, and a cell unit (510) is provided between every two said cold plates (200). A connecting portion (300) is located at one end of the cold plate (200) in the second direction, and the connecting portion (300) protrudes in the first direction from at least one side of the cold plate (200), and the connecting portions (300) of each cold plate (200) are connected to each other; The cold plate (200) includes a liquid cooling region (210) and a phase change region (220). The liquid cooling region (210) includes a first liquid cooling channel (211) and a second liquid cooling channel (212). The first liquid cooling channel (211) and the second liquid cooling channel (212) are spaced apart along a third direction, and both the first liquid cooling channel (211) and the second liquid cooling channel (212) are connected to the connecting part (300) to form a U-shaped liquid cooling circuit. The phase change region (220) is located between the first liquid cooling channel (211) and the second liquid cooling channel (212).

2. The liquid cooling assembly according to claim 1, characterized in that, The cold plate (200) has a flow collection cavity (213) at both ends in the second direction. The connecting part (300) is provided on one of the flow collection cavities (213) and communicates with the flow collection cavity (213).

3. The liquid cooling assembly according to claim 2, characterized in that, The connecting part (300) includes an inlet end (310) and an outlet end (320), and the inlet end (310) and the outlet end (320) are spaced apart along the third direction; The liquid inlet (310) is connected to one of the first liquid cooling channel (211) and the second liquid cooling channel (212) through the collection cavity (213), and the liquid outlet (320) is connected to the other of the first liquid cooling channel (211) and the second liquid cooling channel (212) through the collection cavity (213).

4. The liquid cooling assembly according to claim 3, characterized in that, The collection cavity (213) with the connection part (300) is also provided with a partition plate (214), which separates the liquid inlet end (310) and the liquid outlet end (320) so that the liquid inlet end (310), the liquid outlet end (320), the collection cavity (213), the first liquid cooling channel (211) and the second liquid cooling channel (212) together form the U-shaped liquid cooling circuit.

5. The liquid cooling assembly according to any one of claims 2-4, characterized in that, The cold plate (200) is provided with heat spreaders (215) at both ends in the first direction. The heat spreaders (215) are fixedly connected to the outer surface of the collection cavity (213) along the second direction. The heat spreaders (215) are fixedly connected to the liquid cooling area (210) along the third direction. The first liquid cooling channel (211) and the second liquid cooling channel (212) together with the heat spreader (215) form a sealed cavity (230), and the phase change region (220) is located in the sealed cavity (230).

6. The liquid cooling assembly according to claim 5, characterized in that, One of the heat spreaders (215) has a liquid injection hole (216) which is connected to the sealed cavity (230) for injecting phase change medium.

7. The liquid cooling assembly according to claim 6, characterized in that, The injection height of the phase change medium is in the range of 1 / 3 to 9 / 10 of the height of the sealed cavity (230).

8. The liquid cooling assembly according to claim 7, characterized in that, Also includes: A sealing sheet (217) is disposed on the injection hole (216); The sealing plate (217) is used to seal the injection hole (216) after the phase change medium is injected into the sealed cavity (230).

9. A battery pack, characterized in that, It includes a battery module (500) and a liquid cooling component (100) as described in any one of claims 1-8. The battery module (500) is in contact with the liquid cooling assembly (100).

10. The battery pack according to claim 9, characterized in that, The battery module (500) includes several battery cell units (510). The cell unit (510) includes two surfaces disposed opposite each other along the first direction, at least one of the surfaces being in contact with the cold plate (200) of the liquid cooling assembly (100).

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