Liquid cooling assembly, battery module and battery pack

Abstract

The utility model provides a liquid cooling assembly, a battery module and a battery pack, and relates to the technical field of heat dissipation. The liquid cooling assembly comprises a first liquid cooling side plate and a second liquid cooling side plate. Wherein the first liquid cooling side plate and the second liquid cooling side plate are connected at an included angle and are respectively used for cooling two adjacent side surfaces of the battery cell assembly, so that the overall cooling efficiency of the battery cell assembly is improved. On the basis, the first liquid cooling side plate and the second liquid cooling side plate are arranged to be of a hollow structure and communicate with each other, so that cooling liquid between the first liquid cooling side plate and the second liquid cooling side plate can flow mutually. It is easy to understand that the circulating cooling liquid can make the temperatures of the adjacent side faces of the battery cell assembly tend to be consistent, and uniform cooling is achieved. Moreover, the first liquid cooling side plate is provided with a first water gap, and the second liquid cooling side plate is provided with a second water gap. It is easy to understand that the first water gap and the second water gap are connected with an external cooling liquid circulation system, so that cooling liquid is conveniently and continuously provided for the liquid cooling side plate, the cooling efficiency is improved, and the quick charging requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat dissipation technical field, specifically, relate to a liquid cooling assembly, battery module and battery pack. BACKGROUND

[0002] In the electric automobile, the heat management system is important to the battery performance, prolongs the life and ensures the safe operation. In the prior art, the square shell electric core of two side pole is mostly used to cool the electric core by the upper and lower liquid cooling assembly.

[0003] However, along with the fast development of electric automobile fast charging technology, the heat generated in the fast charging process of battery increases significantly, and the heat dissipation performance of the heat management system in the prior art is difficult to meet the fast charging demand. UTILITY MODEL CONTENTS

[0004] The utility model discloses a liquid cooling assembly, battery module and battery pack, which can cool multiple sides of the electric core assembly simultaneously, improve the overall cooling effect and meet the heat dissipation demand in fast charging.

[0005] The embodiment of the utility model can be realized as follows:

[0006] In the first aspect, the utility model provides a liquid cooling assembly, and the liquid cooling assembly comprises a first liquid cooling side plate and a second liquid cooling side plate; the first liquid cooling side plate and the second liquid cooling side plate are connected at an included angle and are used for cooling two adjacent sides of an electric core assembly respectively; the first liquid cooling side plate and the second liquid cooling side plate are both hollow structures and are communicated with each other, and the first liquid cooling side plate is provided with a first water inlet, and the second liquid cooling side plate is provided with a second water inlet.

[0007] In the optional implementation, the liquid cooling assembly further comprises a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged on the inner wall of the first liquid cooling side plate and / or the second liquid cooling side plate.

[0008] In the optional implementation, the plurality of reinforcing ribs separate the hollow structure in the first liquid cooling side plate and / or the second liquid cooling side plate to form a plurality of liquid cooling flow channels, and the liquid cooling flow channels on the two sides of any one reinforcing rib are communicated and have opposite flow directions.

[0009] In the optional implementation, the first liquid cooling side plate and the second liquid cooling side plate are open at both ends, and the liquid cooling assembly further comprises a first sealing plate and a second sealing plate connected at an included angle, the first sealing plate is sealingly matched with the opening of the first liquid cooling side plate, and the second sealing plate is sealingly matched with the opening of the second liquid cooling side plate.

[0010] In the second aspect, the utility model provides a battery module, and the battery module comprises an electric core assembly and at least two liquid cooling assemblies according to any one of the preceding embodiments, and the at least two liquid cooling assemblies are installed at opposite corners of the electric core assembly along the Y direction.

[0011] In an optional embodiment, the liquid cooling assembly located at one side of the battery cell assembly along the Z direction is an upper liquid cooling assembly, and the first water port of the upper liquid cooling assembly is a first water inlet, and the second water port of the upper liquid cooling assembly is a first water outlet.

[0012] The liquid cooling assembly located at the other side of the battery cell assembly along the Z direction is a lower liquid cooling assembly, and the second water port of the lower liquid cooling assembly is a second water inlet, and the first water port of the lower liquid cooling assembly is a second water outlet.

[0013] In an optional embodiment, the battery module further comprises a water inlet pipeline and a water outlet pipeline, the water inlet pipeline is in communication with the first water inlet and the second water inlet, and the water outlet pipeline is in communication with the first water outlet and the second water outlet.

[0014] In an optional embodiment, the battery module further comprises a first end plate and a second end plate, the first end plate and the second end plate are oppositely arranged at two sides of the battery cell assembly along the X direction, and are both welded with all the liquid cooling assemblies.

[0015] In an optional embodiment, the first end plate is provided with a first avoiding slot and a second avoiding slot, and the first avoiding slot is used for avoiding the first water port, and the second avoiding slot is used for avoiding the second water port.

[0016] In a third aspect, the utility model provides a battery pack, the battery pack includes a box body and the battery module of any preceding embodiment, and the battery module is contained in the box body.

[0017] The liquid cooling assembly, the battery module and the battery pack provided by the utility model embodiment have the beneficial effects that:

[0018] The utility model provides a kind of liquid cooling assembly, battery module and battery pack.The liquid cooling assembly includes first liquid cooling side plate and second liquid cooling side plate.Wherein, first liquid cooling side plate and second liquid cooling side plate are connected at angle, and are used to cool two sides adjacent to battery cell assembly respectively, to improve the cooling efficiency of the whole battery cell assembly.In the above basis, first liquid cooling side plate and second liquid cooling side plate are all set to hollow structure and intercommunication, to flow each other between cooling liquid.Easy to understand, the cooling liquid that flows can make the temperature of the side adjacent to battery cell assembly consistent, realize uniform cooling.And, first liquid cooling side plate is provided with first water port, and second liquid cooling side plate is provided with second water port.Easy to understand, first water port and second water port can be used as the interface of cooling liquid inlet and outlet respectively, with the cooling liquid circulation system of outside, to continuously provide cooling liquid for liquid cooling side plate, further improve cooling efficiency, meet fast charging demand. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the premise of the drawings.

[0020] Figure 1 The liquid cooling assembly schematic view provided by the embodiments of the present application;

[0021] Figure 2 The liquid cooling assembly schematic view provided by the embodiments of the present application; Figure 1 The enlarged schematic view of A in the middle;

[0022] Figure 3 The liquid cooling assembly schematic view provided by the embodiments of the present application; Figure 1 The enlarged schematic view of B in the middle;

[0023] Figure 4 The liquid cooling assembly schematic view provided by the embodiments of the present application;

[0024] Figure 5 The battery module schematic view provided by the embodiments of the present application;

[0025] Figure 6 The side schematic view of the first end plate and the liquid cooling assembly provided by the embodiments of the present application;

[0026] Figure 7 The side schematic view of the second end plate and the liquid cooling assembly provided by the embodiments of the present application;

[0027] Figure 8 The liquid cooling assembly schematic view provided by the embodiments of the present application; Figure 5 The enlarged schematic view of C in the middle;

[0028] Figure 9 The two battery module schematic view provided by the embodiments of the present application;

[0029] Figure 10 The battery module schematic view provided by the embodiments of the present application;

[0030] Figure 11 The liquid cooling assembly schematic view provided by the embodiments of the present application; Figure 10 The enlarged schematic view of D in the middle;

[0031] Figure 12 The liquid cooling assembly schematic view provided by the embodiments of the present application; Figure 10 The enlarged schematic view of E in the middle;

[0032] Figure 13The battery pack schematic diagram is provided by the utility model embodiment.

[0033] Icon: 1-battery pack;10-battery module;30-box;100-liquid cooling assembly;110-first liquid cooling side plate;111-first water port;1111-first water inlet;1113-second water outlet;130-second liquid cooling side plate;131-second water port;1311-first water outlet;1313-second water inlet;150-stiffener;170-liquid cooling flow channel;191-first plugging plate;193-second plugging plate;300-cell assembly;510-water inlet pipeline;530-water outlet pipeline;710-first end plate;711-first avoiding groove;713-second avoiding groove;715-receiving cavity;730-second end plate;910-FPC;930-bar sheet;931-output bar sheet;933-crossing bar sheet;950-nickel sheet. DETAILED DESCRIPTION

[0034] In the related art, the heat generated by the battery during fast charging is significantly increased, and the heat dissipation performance of the thermal management system is difficult to meet the fast charging demand.

[0035] To solve the above problems, the utility model provides a liquid cooling assembly, a battery module and a battery pack 1, which can cool multiple sides of the cell assembly at the same time, improve the overall cooling effect and meet the heat dissipation demand during fast charging.

[0036] To make the purpose, technical scheme and advantages of the utility model embodiments clearer, the technical scheme of the utility model embodiments will be described clearly and completely below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the utility model embodiments described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0038] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0040] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0042] The overall structure, working principle and technical effects of the liquid cooling assembly 100, the battery module 10 and the battery pack 1 provided by the utility model are described in detail below through embodiments and in conjunction with the drawings.

[0043] Figure 1 The liquid cooling assembly 100 provided by the embodiments of the utility model is shown in the schematic diagram, Figure 2 The liquid cooling assembly 100 provided by the embodiments of the utility model is shown in the schematic diagram, Figure 1 The enlarged schematic diagram of position A in the middle, Figure 3 The liquid cooling assembly 100 provided by the embodiments of the utility model is shown in the schematic diagram, Figure 1 The enlarged schematic diagram of position B in the middle, please refer to Figures 1 to 3 The utility model provides a kind of liquid cooling assembly 100, it is applied to heat dissipation field, it includes first liquid cooling side plate 110 and second liquid cooling side plate 130.

[0044] Among them, first liquid cooling side plate 110 and second liquid cooling side plate 130 are connected at an angle, and are respectively used to cool the two adjacent sides of battery cell assembly 300, to improve the cooling efficiency of battery cell assembly 300 as a whole. On the basis of the above, first liquid cooling side plate 110 and second liquid cooling side plate 130 are both set to hollow structure and are communicated with each other, to make cooling liquid flow each other. It is easy to understand that the flowing cooling liquid can make the temperature of the adjacent side of battery cell assembly 300 consistent, to realize uniform cooling.

[0045] And, first liquid cooling side plate 110 is provided with first water gap 111, and second liquid cooling side plate 130 is provided with second water gap 131. It is easy to understand that first water gap 111 and second water gap 131 can be respectively used as the interface of cooling liquid in and out, with the cooling liquid circulation system of outside, to provide cooling liquid for liquid cooling side plate continuously, further improve cooling efficiency, meet fast charging demand.

[0046] In some embodiments, asFigure 3 As shown, the first liquid cooling side plate 110 and the second liquid cooling side plate 130 are both open at both ends, and the liquid cooling assembly 100 further comprises a first blocking plate 191 and a second blocking plate 193 connected at an angle. The first blocking plate 191 is in sealing fit with the opening of the first liquid cooling side plate 110, and the second blocking plate 193 is in sealing fit with the opening of the second liquid cooling side plate 130. It is easy to understand that for the liquid cooling assembly 100 provided by the present application, the number of the first blocking plate 191 is two, which respectively seals the front and rear opening of the first liquid cooling side plate 110. Correspondingly, the number of the second blocking plate 193 is also two, which respectively seals the front and rear opening of the second liquid cooling side plate 130.

[0047] Based on the design of the first blocking plate 191 and the second blocking plate 193, the first liquid cooling side plate 110 and the second liquid cooling side plate 130 form a completely closed cooling channel, which ensures the full circulation of the cooling liquid and improves the cooling efficiency. Alternatively, the first blocking plate 191 is welded with the opening of the first liquid cooling side plate 110 to achieve sealing, and the second blocking plate 193 is welded with the opening of the second liquid cooling side plate 130 to achieve sealing. In addition, in other embodiments, the blocking plate and the liquid cooling side plate can also be designed in one piece, which will not be described in detail in the present application.

[0048] Please refer to Figure 4 In order to improve the structural strength of the first liquid cooling side plate 110 and / or the second liquid cooling side plate 130, the liquid cooling assembly 100 further comprises a plurality of reinforcing ribs 150 arranged on the inner wall of the first liquid cooling side plate 110 and / or the second liquid cooling side plate 130. It should be noted that the present application does not limit the length of the reinforcing ribs 150 to be consistent, and a plurality of reinforcing ribs 150 of different lengths can be used to improve the structural strength of the corresponding position.

[0049] Further, the plurality of reinforcing ribs 150 divide the hollow structure in the first liquid cooling side plate 110 and / or the second liquid cooling side plate 130 to form a plurality of liquid cooling flow channels 170. Moreover, the liquid cooling flow channels 170 on both sides of any one reinforcing rib 150 are connected and the flow directions are opposite. Through the above arrangement, the cooling liquid is divided, so that the cooling liquid forms a plurality of loops in the side plate, ensuring that the temperature of each area is more balanced, and the uniformity is improved.

[0050] Please refer to Figure 5The application also provides a battery module 10, which comprises the cell assembly 300 and at least two liquid cooling assemblies 100 of the foregoing embodiments. Moreover, the at least two liquid cooling assemblies 100 are respectively arranged at opposite corners of the cell assembly 300 along the Y direction. It is easy to understand that any one of the liquid cooling assemblies 100 will cool two adjacent surfaces at the opposite corners of the cell assembly 300, thereby improving the overall cooling efficiency of the cell assembly 300 as described above. As a preferred, in the battery module 10 provided by the application, the number of the liquid cooling assemblies 100 is four, which are respectively arranged at the four corners of the cell assembly 300, so as to achieve the cooling of the cell assembly 300 in full coverage.

[0051] Please refer to Figure 6 and Figure 7 In the application, considering the influence of the self-weight of the cooling liquid on the flow of the cooling liquid, the liquid cooling assembly 100 located at one side of the cell assembly 300 along the Z direction is an upper liquid cooling assembly 100, and the first water port 111 of the upper liquid cooling assembly 100 is a first water inlet 1111, and the second water port 131 of the upper liquid cooling assembly 100 is a first water outlet 1311; the liquid cooling assembly 100 located at the other side of the cell assembly 300 along the Z direction is a lower liquid cooling assembly 100, and the second water port 131 of the lower liquid cooling assembly 100 is a second water inlet 1313, and the first water port 111 of the lower liquid cooling assembly 100 is a second water outlet 1113. It is easy to understand that the arrangement of the above water inlets and outlets conforms to the self-gravity of the cooling liquid, accelerates the flow rate, and improves the liquid cooling efficiency.

[0052] Based on the above, for the upper liquid cooling assembly 100, the cooling liquid enters the first liquid cooling side plate 110 through the first water inlet 1111 to cool the top surface of the cell assembly 300; then, the cooling liquid quickly enters the second cooling side plate under the influence of gravity to cool the side surface of the cell assembly 300; finally, the cooling liquid flows out from the first water outlet 1311. Similarly, for the lower liquid cooling assembly 100, the cooling liquid enters the second liquid cooling side plate 130 through the second water inlet 1313 to cool the side surface of the cell assembly 300; then, the cooling liquid quickly enters the first cooling side plate under the influence of gravity to cool the bottom surface of the cell assembly 300; finally, the cooling liquid flows out from the second water outlet 1113.

[0053] Further, please refer to Figure 8, the battery module 10 further comprises a water inlet pipeline 510 and a water outlet pipeline 530. The water inlet pipeline 510 is in communication with the first water inlet 1111 and the second water inlet 1313, so as to uniformly distribute the cooling liquid to the upper liquid cooling assembly 100 and the lower liquid cooling assembly 100. The water outlet pipeline 530 is in communication with the first water outlet 1311 and the second water outlet 1113, so as to smoothly discharge the cooling liquid in the upper liquid cooling assembly 100 and the lower liquid cooling assembly 100. That is to say, based on the arrangement of the water inlet pipeline 510 and the water outlet pipeline 530, the cooling liquid can flow in the liquid cooling side plate, effectively taking away the heat generated by the cell assembly 300, improving the cooling efficiency, and keeping the cell assembly 300 working in an appropriate temperature range. It should be noted that the water inlet pipeline 510 and the water outlet pipeline 530 do not interfere with any space in the design. Moreover, as shown in Figure 9 , when there are multiple liquid cooling assemblies 100, the water inlet pipeline 510 and the water outlet pipeline 530 are respectively connected to the corresponding water collection pipelines.

[0054] As shown in Figure 6 and Figure 7 , in the embodiments provided in the present application, in order to save costs and improve the fixing of the liquid cooling assembly 100 and the cell assembly 300 during installation, the battery module 10 further comprises a first end plate 710 and a second end plate 730. The first end plate 710 and the second end plate 730 are arranged on the two sides of the cell assembly 300 along the X direction, and are both welded with all the liquid cooling assemblies 100, thereby significantly enhancing the overall structural stability of the battery module 10.

[0055] Further, in order to facilitate the communication between the water inlet pipeline 510 and the water outlet pipeline 530 and the liquid cooling assembly 100, the first end plate 710 is provided with a first avoiding slot 711 and a second avoiding slot 713, and the first avoiding slot 711 is used for avoiding the first water inlet 111, and the second avoiding slot 713 is used for avoiding the second water inlet 131. It is easy to understand that the positions of the first avoiding slot 711 and the second avoiding slot 713 should be accurately corresponding to the first water inlet 111 and the second water inlet 131 respectively, so as to ensure the accurate butt joint of the inlet and outlet pipelines and the water inlets. Alternatively, the shape and size of the above-mentioned avoiding slots are determined according to the diameter and connection mode of the inlet and outlet pipelines, so as to ensure the smooth passing of the pipelines.

[0056] In addition, as shown in Figures 9 to 12As shown, it also needs to be supplemented that the present application also includes a CCS (Cell sContact System, integrated busbar). The CCS is arranged at the side of the battery module 10, without exceeding the width range of the module, saving the occupied space. Specifically, the CCS includes an FPC 910 (Flexible Printed Circuit, flexible printed circuit board), a plurality of tabs 930, and a plurality of nickel sheets 950. Among them, the tabs 930 are welded to the pole of the battery cell assembly 300 and connected to the FPC 910 through the nickel sheet 950. In addition, the first end plate is provided with a receiving cavity 715 that cooperates with the FPC 910. Based on this, one end of the FPC 910 with a plug is inserted into the receiving cavity 715 of the first end plate 710, without the need for additional fixing parts to achieve connection, thereby achieving the beneficial effects of saving cost and occupied space, simplifying the cooperation relationship, facilitating installation, and improving space utilization.

[0057] The CCS1 and CCS2 are defined as being arranged on the two sides of the battery cell assembly 300 along the Y direction, respectively. Among them, the tabs 930 of the CCS1 include output tabs 931 close to the first end plate 710 and jumper tabs 933 close to the second end plate 730. Similar to other tabs 930, the output tabs 931 and the jumper tabs 933 are welded to the poles of the battery cell assembly 300 and connected to the FPC 910 through the nickel sheet 950. Unlike other tabs 930, the output tabs 931 are connected to the plug of the FPC 910, and the jumper tabs 933 are connected to the CCS1 in the adjacent battery module 10 to achieve electrical connection between the two battery modules 10.

[0058] Taking the battery module 10 provided by the present embodiment as an example, the installation sequence is as follows:

[0059] A plurality of battery cells are arranged in the fixture along the X direction to form a battery cell assembly 300, and four liquid cooling assemblies 100 are installed at the four corners of the battery cell assembly 300. Then, the CCS1 and CCS2 are arranged on the two sides of the battery cell assembly 300 along the Y direction, and the first end plate 710 and the second end plate 730 are arranged on the two sides of the battery cell assembly 300 along the X direction to clamp the battery cell assembly 300. Then, the FPC 910 in the CCS1 and CCS2 is inserted into the receiving cavity 715 of the first end plate 710. The four liquid cooling assemblies 100, the first end plate 710, the second end plate 730, and the tabs 930 and nickel sheets 950 in the CCS1 and CCS2 are welded to complete the assembly of a battery module.

[0060] In addition, please refer to Figure 13The application also provides a battery pack 1 comprising a box 30 and the battery module 10 in the foregoing embodiments. It is easy to understand that the battery pack 1 comprises the battery module 10 in the foregoing embodiments, that is, comprises the liquid cooling assembly 100 in the foregoing embodiments. Therefore, the battery pack 1 also has the beneficial effect that the plurality of sides of the battery cell assembly 300 can be cooled at the same time, the overall cooling effect is improved, and the heat dissipation demand during fast charging is met. In addition, it also needs to be explained that the battery cell enters the box 30 in the form of the battery module 10, which can facilitate installation.

[0061] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A liquid-cooled assembly, comprising: The liquid cooling assembly (100) comprises a first liquid cooling side plate (110) and a second liquid cooling side plate (130); the first liquid cooling side plate (110) and the second liquid cooling side plate (130) are connected at an angle and are respectively used for cooling two adjacent sides of the battery cell assembly (300); the first liquid cooling side plate (110) and the second liquid cooling side plate (130) are both provided as hollow structures and are in communication with each other, and the first liquid cooling side plate (110) is provided with a first water inlet (111), and the second liquid cooling side plate (130) is provided with a second water inlet (131).

2. The liquid-cooling assembly of claim 1, wherein, The liquid cooling assembly (100) further comprises a plurality of reinforcing ribs (150), and the plurality of reinforcing ribs (150) are arranged on the inner wall of the first liquid cooling side plate (110) and / or the second liquid cooling side plate (130).

3. The liquid-cooling assembly of claim 2, wherein The plurality of reinforcing ribs (150) divide the hollow structure in the first liquid cooling side plate (110) and / or the second liquid cooling side plate (130) to form a plurality of liquid cooling flow channels (170), and the liquid cooling flow channels (170) on both sides of any one of the reinforcing ribs (150) are in communication and have opposite flow directions.

4. The liquid-cooling assembly of claim 1, wherein, The first liquid cooling side plate (110) and the second liquid cooling side plate (130) are open at both ends, and the liquid cooling assembly (100) further comprises a first sealing plate (191) and a second sealing plate (193) connected at an angle, the first sealing plate (191) is in sealing cooperation with the opening of the first liquid cooling side plate (110), and the second sealing plate (193) is in sealing cooperation with the opening of the second liquid cooling side plate (130).

5. A battery module, characterized by The battery module (10) comprises a battery cell assembly (300) and at least two liquid cooling assemblies (100) as claimed in any one of claims 1 to 4, and the at least two liquid cooling assemblies (100) are respectively arranged at opposite corners of the battery cell assembly (300) along the Y direction.

6. The battery module of claim 5, wherein, The liquid cooling assembly (100) located on one side of the battery cell assembly (300) along the Z direction is an upper liquid cooling assembly (100), and the first water inlet (111) of the upper liquid cooling assembly (100) is a first water inlet (1111), and the second water inlet (131) of the upper liquid cooling assembly (100) is a first water outlet (1311). The liquid cooling assembly (100) located on the other side of the battery cell assembly (300) along the Z direction is a lower liquid cooling assembly (100), and the second water inlet (131) of the lower liquid cooling assembly (100) is a second water inlet (1313), and the first water inlet (111) of the lower liquid cooling assembly (100) is a second water outlet (1113).

7. The battery module of claim 6, wherein, The battery module (10) further comprises a water inlet pipeline (510) and a water outlet pipeline (530), the water inlet pipeline (510) is in communication with the first water inlet (1111) and the second water inlet (1313), and the water outlet pipeline (530) is in communication with the first water outlet (1311) and the second water outlet (1113).

8. The battery module of claim 5, wherein, The battery module (10) further comprises a first end plate (710) and a second end plate (730), which are oppositely arranged along the X direction on both sides of the cell assembly (300) and are welded with all the liquid cooling assemblies (100).

9. The battery module of claim 8, wherein, The first end plate (710) is provided with a first avoiding groove (711) and a second avoiding groove (713), the first avoiding groove (711) is used for avoiding the first water port (111), and the second avoiding groove (713) is used for avoiding the second water port (131).

10. A battery pack, characterized by, The battery pack (1) comprises a box (30) and the battery module (10) as claimed in any one of claims 5 to 9, and the battery module (10) is contained in the box (30).

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