Liquid cooling module and battery pack

Abstract

The invention provides a liquid cooling module and a battery pack, the liquid cooling module comprises a second liquid cooling plate and a third liquid cooling plate, the second liquid cooling plate is internally provided with a flow channel, the third liquid cooling plate and the second liquid cooling plate are arranged at an interval, and the third liquid cooling plate is provided with a first cooling part; according to the liquid cooling device, the first cooling part is arranged to be communicated with the flow channel so as to guide the cooling liquid into the first cooling part and / or guide the cooling liquid out of the first cooling part, so that the cooling liquid can flow between the second liquid cooling plate and the third liquid cooling plate, the flowing path of the cooling liquid is simplified, and the requirement of a bent or overlong pipeline is reduced; and the internal space utilization rate of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid cooling module and a battery pack. Background Art

[0002] The power battery pack is the energy storage and power output device of electric vehicles and the power source of electric vehicles. In order for the power battery pack to work normally, the battery modules in the power battery pack need to be equipped with corresponding heat dissipation structures, such as a liquid cooling system, to dissipate the heat generated by the battery module as quickly as possible. At present, the import and export of coolant in the liquid cooling system in the industry are completely dependent on pipelines. As the number of battery pack stacking layers increases, the pipeline design of the liquid cooling plate connected in parallel is difficult to take into account space limitations, resulting in limited installation of the liquid cooling plate.

[0003] Therefore, in view of the complex spatial layout faced by the piping design of the liquid cooling system in the relevant technology, it is urgent to further optimize the liquid cooling module to meet the needs of larger capacity battery packs. Summary of the invention

[0004] The embodiments of the present application provide a liquid cooling module and a battery pack to solve or at least partially solve the deficiencies of the above-mentioned background technology.

[0005] In a first aspect, an embodiment of the present application provides a liquid cooling module, comprising:

[0006] A second liquid cooling plate having a flow channel therein;

[0007] The third liquid cooling plate is spaced apart from the second liquid cooling plate, and the third liquid cooling plate is provided with a first cooling part, which is communicated with the flow channel to introduce cooling liquid into the first cooling part and / or to discharge cooling liquid from the first cooling part.

[0008] In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery module and the liquid cooling module described in any one of the above embodiments; wherein the battery module is arranged between adjacent liquid cooling plates.

[0009] Beneficial effects of the embodiments of the present application:

[0010] An embodiment of the present application provides a liquid cooling module and a battery pack, wherein the liquid cooling module includes a second liquid cooling plate and a third liquid cooling plate, wherein the second liquid cooling plate is provided with a flow channel, the third liquid cooling plate is spaced apart from the second liquid cooling plate, and the third liquid cooling plate is provided with a first cooling part, and the first cooling part is arranged to be connected with the flow channel so as to introduce cooling liquid into the first cooling part and / or discharge cooling liquid from the first cooling part, thereby enabling cooling liquid to flow between the second liquid cooling plate and the third liquid cooling plate, simplifying the flow path of the cooling liquid, reducing the need for bending or excessively long pipelines, and thereby improving the internal space utilization of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution in this embodiment, the drawings required for use in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0013] Figure 2 A schematic diagram of the structure of the liquid cooling module provided in the embodiment of the present application;

[0014] Figure 3 A top view of the liquid cooling module provided in an embodiment of the present application;

[0015] Figure 4 A schematic top view of a second liquid cooling plate provided in an embodiment of the present application;

[0016] Figure 5 A schematic top view of a third liquid cooling plate provided in an embodiment of the present application;

[0017] Figure 6 A schematic diagram of a first structure of a first joint provided in an embodiment of the present application;

[0018] Figure 7 A second structural schematic diagram of the first joint provided in an embodiment of the present application;

[0019] Figure 8 A schematic diagram of the structure of a first connecting joint provided in an embodiment of the present application;

[0020] Fig. 9 This is a schematic diagram of the structure of the first liquid cooling plate provided in an embodiment of the present application.

[0021] Description of reference numerals:

[0022] 1-battery pack; 11-battery module; 12-liquid cooling module; 13-groove; 15-end plate;

[0023] 110 - battery cell; 111 - first battery module; 112 - second battery module; 113 - third battery module; 114 - fourth battery module; 141 - bottom plate; 151 - vent;

[0024] 121-first liquid cooling plate; 122-second liquid cooling plate; 123-third liquid cooling plate; 124-fourth liquid cooling plate; 125-first joint pipeline assembly; 126-second joint pipeline assembly; 127-quick-connect plug;

[0025] 1211-first inlet; 1212-first outlet;

[0026] 1220-flow channel; 1221-first sub-inlet; 1222-first sub-outlet; 1223-second sub-inlet; 1224-second sub-outlet; 1225-first through hole; 1226-second through hole; 1227-first liquid inlet flow channel; 1228-first liquid outlet flow channel; 1229-second cooling part;

[0027] 12291-second liquid inlet channel; 12292-second liquid outlet channel; 12293-first liquid cooling channel;

[0028] 1230 - first cooling part; 1231 - second inlet; 1232 - second outlet; 1233 - third liquid inlet channel; 1234 - third liquid outlet channel; 1235 - second liquid cooling channel;

[0029] 1241 - third inlet; 1242 - third outlet; 1243 - fourth liquid inlet channel; 1244 - fourth liquid outlet channel; 1245 - third liquid cooling channel;

[0030] 1251-first joint; 1252-third joint; 1253-first connecting joint; 1254-first pipeline;

[0031] 12541 - first straight line segment; 12542 - second straight line segment; 12543 - third straight line segment; 12544 - first bending segment; 12545 - second bending segment;

[0032] 12510-liquid inlet connector; 12511-first opening; 12512-second opening; 12513-third opening;

[0033] 12531-the fourth opening; 12532-the fifth opening;

[0034] 1261 - second joint; 1262 - fourth joint; 1263 - second connecting joint; 1264 - second pipeline;

[0035] 12610-Liquid outlet connector. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0037] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ;in, Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of the liquid cooling module provided in the embodiment of the present application;

[0038] Figure 3 A top view of the liquid cooling module provided in an embodiment of the present application; Figure 4 A schematic top view of a second liquid cooling plate provided in an embodiment of the present application; Figure 5 This is a schematic top view of the third liquid cooling plate provided in an embodiment of the present application.

[0039] In one embodiment, the battery pack 1 includes a battery module 11 and a liquid cooling module 12 , the liquid cooling module 12 includes a plurality of stacked liquid cooling plates, and the battery module 11 is disposed between adjacent liquid cooling plates.

[0040] Among them, the liquid cooling module 12 includes a first liquid cooling plate 121, a second liquid cooling plate 122 and a third liquid cooling plate 123, the second liquid cooling plate 122 is arranged above the first liquid cooling plate 121, and a flow channel 1220 is provided in the second liquid cooling plate 122. The third liquid cooling plate 123 is spaced apart from the second liquid cooling plate 122, and the third liquid cooling plate 123 is provided with a first cooling part 1230. The first cooling part 1230 is connected to the flow channel 1220 to introduce cooling liquid into the first cooling part 1230 and / or to export cooling liquid from the first cooling part 1230, so that the cooling liquid can flow between the second liquid cooling plate 122 and the third liquid cooling plate 123, simplifying the flow path of the cooling liquid, reducing the need for bending or excessively long pipelines, and thereby improving the internal space utilization of the battery pack 1.

[0041] Please continue to combine Figures 1 to 5In one embodiment, a first liquid inlet channel 1227 and a first liquid outlet channel 1228 are provided in the flow channel 1220, and a second cooling portion 1229 located between the first liquid inlet channel 1227 and the first liquid outlet channel 1228 is also provided in the second liquid cooling plate 122, and the second liquid cooling plate 122 includes a first sub-inlet 1221, a first sub-outlet 1222, a second sub-inlet 1223 and a second sub-outlet 1224.

[0042] Among them, one end of the second cooling part 1229 is connected to the second sub-inlet 1223, the other end of the second cooling part 1229 is connected to the second sub-outlet 1224, one end of the first liquid inlet channel 1227 is connected to the first sub-inlet 1221, the other end of the first liquid inlet channel 1227 is connected to one end of the first cooling part 1230, one end of the first liquid outlet channel 1228 is connected to the first sub-outlet 1222, and the other end of the first liquid outlet channel 1228 is connected to the other end of the first cooling part 1230.

[0043] Specifically, the third liquid cooling plate 123 and the first liquid cooling plate 121 are in the same layer and are spaced apart along the first direction Z, and the third liquid cooling plate 123 includes a second inlet 1231 and a second outlet 1232; one end of the first liquid inlet channel 1227 is connected to the first sub-inlet 1221, the other end of the first liquid inlet channel 1227 is connected to the second inlet 1231, one end of the first liquid outlet channel 1228 is connected to the first sub-outlet 1222, and the other end of the first liquid outlet channel 1228 is connected to the second outlet 1232; one end of the second cooling part 1229 is connected to the second sub-inlet 1223, and the other end of the second cooling part 1229 is connected to the second sub-outlet 1224.

[0044] One end of the first liquid inlet channel 1227 and the first sub-inlet 1221, and one end of the first liquid outlet channel 1228 and the first sub-outlet 1222 can be connected by pipelines; it can be understood that, in this embodiment, one end of the first liquid inlet channel 1227 is connected to the first sub-inlet 1221, the other end of the first liquid inlet channel 1227 is connected to the second inlet 1231, one end of the first liquid outlet channel 1228 is connected to the first sub-outlet 1222, and the other end of the first liquid outlet channel 1228 is connected to the second outlet 1232, so that the coolant can be transported from the second liquid cooling plate 122 to the third liquid cooling plate 123, and the second liquid inlet channel 12291 and the second liquid outlet channel 12292 can be used as transition pipes to make the flow path of the coolant simpler, reduce the need for curved or overly long pipelines in the related art, and can significantly reduce the space occupied by the pipelines, thereby improving the space utilization inside the battery pack 1.

[0045] Furthermore, the coolant can achieve uniform flow distribution between the second liquid cooling plate 122 and the third liquid cooling plate 123 , which is critical for effective cooling of the multi-layer structure, avoiding overcooling or overheating of certain cooling plates and ensuring the overall cooling effect of the liquid cooling module 12 .

[0046] It should be noted that the first direction is Figure 1 The Z direction, that is, Figure 1 The height direction of the battery module 11, the second direction is Figure 1 The X direction in the Figure 1 The length direction of the battery module 11, the third direction is Figure 1 Y direction in , that is, Figure 1 The width direction of the battery module 11.

[0047] Please continue to combine Figures 1 to 5 In one embodiment, the second cooling part 1229 includes a second liquid inlet channel 12291, a second liquid outlet channel 12292, and a plurality of first liquid cooling channels 12293 arranged in parallel; wherein, one end of the second liquid inlet channel 12291 is connected to the second sub-inlet 1223, the other end of the second liquid inlet channel 12291 is connected to one end of the plurality of first liquid cooling channels 12293, the other end of the plurality of first liquid cooling channels 12293 is connected to one end of the second liquid outlet channel 12292, and the other end of the first liquid outlet channel 1228 is connected to the second sub-outlet 1224.

[0048] It can be understood that this embodiment optimizes the flow path of the coolant in the second liquid cooling plate 122 by setting the second liquid inlet channel 12291, the second liquid outlet channel 12292, and a plurality of the first liquid cooling channels 12293 arranged in parallel in the second liquid cooling plate 122; wherein the second liquid inlet channel 12291 and the second liquid outlet channel 12292 can effectively control the flow rate of the coolant so that it is evenly distributed in each of the first liquid cooling channels 12293, and reduce the problems of excessive fluid resistance or unstable flow that may occur in a single channel, thereby achieving better fluid management.

[0049] Specifically, when the coolant enters the second liquid inlet channel 12291 through the second sub-inlet 1223, the second liquid inlet channel 12291 can guide the coolant to be evenly distributed to each of the first parallel liquid cooling channels 12293, thereby avoiding too high or too low flow in a certain first liquid cooling channel 12293, reducing the resistance difference of the coolant in different paths, and ensuring the balance of the outlet flow rate and flow rate of each channel; at the same time, the second liquid outlet channel 12292 can evenly gather the coolant in each of the first liquid inlet channels 1227 together and discharge it from the second sub-outlet 1224, thereby realizing uniform flow of the coolant in each liquid cooling plate, improving the overall heat dissipation effect and the fluid balance of the system.

[0050] Please continue to combine Figures 1 to 5 In one embodiment, the first cooling part 1230 includes a third liquid inlet channel 1233, a third liquid outlet channel 1234, and a plurality of second liquid cooling channels 1235 arranged in parallel; wherein, one end of the third liquid inlet channel 1233 is connected to the second inlet 1231, the other end of the third liquid inlet channel 1233 is connected to one end of the plurality of second liquid cooling channels 1235, the other end of the plurality of second liquid cooling channels 1235 is connected to one end of the third liquid outlet channel 1234, and the other end of the third liquid outlet channel 1234 is connected to the second outlet 1232.

[0051] It can be understood that this embodiment optimizes the flow path of the coolant in the third liquid cooling plate 123 by setting the first cooling part 1230 to include the second liquid inlet channel 12291, the second liquid outlet channel 12292, and a plurality of second liquid cooling channels 1235 arranged in parallel; wherein the second liquid inlet channel 12291 and the second liquid outlet channel 12292 can effectively control the flow rate of the coolant so that it is evenly distributed in each of the second liquid cooling channels 1235, and reduce the problems of excessive fluid resistance or unstable flow that may occur in a single channel, thereby achieving better fluid management.

[0052] Please continue to combine Figures 1 to 5 ; The first liquid inlet channel 1227 is not connected to the second liquid inlet channel 12291, and / or the first liquid outlet channel 1228 is not connected to the second liquid outlet channel 12292.

[0053] It should be noted that the present embodiment does not impose any specific restrictions on the channel connection method between the first liquid inlet channel 1227, the second liquid inlet channel 12291, the first liquid outlet channel 1228 and the second liquid outlet channel 12292. However, in order to better illustrate the innovation of the present application, the present embodiment takes the example that the first liquid inlet channel 1227 is not connected to the second liquid inlet channel 12291, and the first liquid outlet channel 1228 is not connected to the second liquid outlet channel 12292 to illustrate the technical solution of the present application.

[0054] It can be understood that, in this embodiment, the first liquid inlet channel 1227, the third liquid inlet channel 1233, the second liquid cooling channel 1235, the third liquid outlet channel 1234, and the first liquid outlet channel 1228 form a separate circuit, and the second liquid inlet channel 12291, the first liquid cooling channel 12293, and the first liquid outlet channel 1228 form a separate circuit, thereby avoiding intersection and interference between different liquid flows and ensuring that the coolant flow in each circuit can be independently controlled.

[0055] Specifically, one end of the first liquid inlet channel 1227 is connected to the first sub-inlet 1221, and one end of the second liquid inlet channel 12291 is connected to the second sub-inlet 1223, thereby ensuring that the coolant flows in different channels separately, avoiding the mixed flow phenomenon of the coolant channels, and making the operation of the liquid cooling module 12 more stable; at the same time, the first liquid inlet channel 1227 is not connected to the second liquid inlet channel 12291, and the first liquid outlet channel 1228 is not connected to the second liquid outlet channel 12292, which can avoid excessive fluid resistance or pressure drop in the second liquid cooling plate 122, and ensure that the flow rate and pressure of the coolant in each channel in the second liquid cooling plate 122 remain uniform.

[0056] Please continue to combine Figures 1 to 5 In one embodiment, the first liquid inlet channel 1227, the first liquid outlet channel 1228, the third liquid inlet channel 1233 and the third liquid outlet channel 1234 are all linear channel structures.

[0057] It is understandable that the use of a linear flow channel structure can reduce the friction and resistance of the coolant in the flow channel, ensure that the coolant can pass through each flow channel smoothly, and enable the coolant to flow quickly with less energy consumption, thereby improving the flow efficiency of the entire system; and the design of the linear flow channel simplifies the manufacturing process and reduces the processing difficulty and cost brought about by the complex flow channel design.

[0058] Please continue to combine Figures 1 to 5 In one embodiment, the first liquid cooling plate 121 includes a first inlet 1211 and a first outlet 1212 that are connected to each other, and the liquid cooling module 12 includes a plurality of fourth liquid cooling plates 124, a first joint pipe assembly 125, and a second joint pipe assembly 126; the fourth liquid cooling plate 124 is arranged on a side of the first liquid cooling plate 121 away from the first liquid cooling plate 121, and the plurality of fourth liquid cooling plates 124 are arranged at intervals along the first direction Z, and the fourth liquid cooling plate 124 includes a third inlet 1241 and a third outlet 1242, the first liquid cooling plate 121 is arranged at intervals from the fourth liquid cooling plate 124, and the area of ​​the first liquid cooling plate 121 is smaller than the area of ​​the fourth liquid cooling plate 124.

[0059] The first joint pipeline assembly 125 is arranged at one end of the plurality of fourth liquid cooling plates 124; the second joint pipeline assembly 126 is arranged at the other end of the plurality of fourth liquid cooling plates 124; wherein, the first joint pipeline assembly 125 connects the first inlet 1211, the first sub-inlet 1221, the second sub-inlet 1223 and the third inlet 1241, and the second joint pipeline assembly 126 connects the first outlet 1212, the first sub-outlet 1222, the second sub-outlet 1224 and the third outlet 1242, and the first joint pipeline assembly 125 and the second joint pipeline assembly 126 can be arranged at intervals along the second direction X, and the second direction X and the first direction Z can be arranged at right angles.

[0060] The battery module 11 may include a plurality of battery cells 110 , and the battery cells 110 may be square battery cells 110 . The plurality of battery cells 110 may be arranged in sequence along a third direction Y; wherein the third direction Y and the first direction Z may be arranged at a right angle.

[0061] Along the second direction X, end plates 15 are provided at both ends of the battery module 11, and a plurality of vents 151 are opened on the end plates 15, and the vents 151 penetrate the end plates 15 along the third direction Y; it can be understood that the vents 151 are designed to allow air or cooling gas to flow freely along the third direction Y, thereby effectively taking away the heat of the battery module 11, and can keep the operating temperature of the battery module 11 within a safe range during high power output or long-term operation, thereby avoiding performance degradation or thermal runaway due to overheating.

[0062] Specifically, the battery pack 1 includes a plurality of first battery modules 111 and a second battery module 112, wherein the plurality of first battery modules 111 are arranged at intervals along the first direction Z, wherein one first battery module 111 is arranged between two adjacent fourth liquid cooling plates 124, the second battery module 112 is arranged above the first battery module 111, and the second battery module 112 is arranged between the fourth liquid cooling plate 124 and the first liquid cooling plate 121; two adjacent fourth liquid cooling plates 124 can be respectively located at the top and bottom of the first battery module 111 to achieve double-sided cooling of the first battery module 111, and the fourth liquid cooling plate 124 and the first liquid cooling plate 121 can be respectively located at the top and bottom of the second battery module 112 to achieve double-sided cooling of the second battery module 112; this design enables the coolant to effectively cover the entire surface of the first battery module 111 and the second battery module 112, thereby improving the uniformity and efficiency of heat dissipation, preventing overheating in a local area of ​​the battery pack 1, and improving the overall thermal management capability.

[0063] It should be noted that the first joint pipe assembly 125 is arranged at one end of the plurality of fourth liquid cooling plates 124, which means that the first joint pipe assembly 125 is arranged at one end close to the third inlet 1241 of the fourth liquid cooling plate 124; the second joint pipe assembly 126 is arranged at the other end of the plurality of fourth liquid cooling plates 124, which means that the second joint pipe assembly 126 is arranged at one end close to the third outlet 1242 of the fourth liquid cooling plate 124.

[0064] It can be understood that in this embodiment, a plurality of the fourth liquid cooling plates 124 are arranged at intervals along the first direction Z, the first liquid cooling plate 121 is arranged above the fourth liquid cooling plate 124, and the first liquid cooling plate 121 and the fourth liquid cooling plate 124 are arranged at intervals, so that layered cooling can be achieved, that is, the battery modules 11 located at different heights in the battery pack 1 can be effectively dissipated at the same time; and the first joint pipe assembly 125 connects the first inlet 1211, the first sub-inlet 1221, the second sub-inlet 1223 and the third inlet 1241, and the second joint pipe assembly 126 connects the first outlet 1212, the first sub-outlet 1222, the second sub-outlet 1224 and the third outlet 1242, so that the plurality of the fourth liquid cooling plates 124, one first liquid cooling plate 121, one second liquid cooling plate 122 and one third liquid cooling plate 123 are connected in parallel, thereby improving the flow uniformity and temperature control capability of the cooling liquid.

[0065] In addition, this embodiment can effectively save space inside the battery pack 1 by setting the area of ​​the first liquid cooling plate 121 to be smaller than the area of ​​the fourth liquid cooling plate 124, and is suitable for arrangement in a multi-layer battery pack 1, especially when the height is limited in the first direction Z; wherein the fourth liquid cooling plate 124 with a larger area can be configured to cool the main area of ​​the battery pack 1, and the first liquid cooling plate 121 with a smaller area can be configured to cool the upper area of ​​the battery pack 1. This design provides a more flexible temperature control solution, helps to achieve uniform temperature distribution and reduce the risk of local overheating.

[0066] At the same time, by arranging the plurality of the fourth liquid cooling plates 124, the first liquid cooling plates 121, and the second liquid cooling plates 122 at intervals along the first direction Z, close stacking of the cooling plates is avoided, making the pipeline arrangement more flexible, effectively utilizing the available space in the battery pack 1, and reducing complex pipeline connections and layout pressure.

[0067] Furthermore, the first joint pipe assembly 125 connects the first inlet 1211, the first sub-inlet 1221, the second sub-inlet 1223 and the third inlet 1241, and the second joint pipe assembly 126 connects the first outlet 1212, the first sub-outlet 1222, the second sub-outlet 1224 and the third outlet 1242, so that the plurality of fourth liquid cooling plates 124, the first liquid cooling plates 121, and the second liquid cooling form a layered cooling structure arranged in parallel, so that the liquid cooling module 12 can be suitable for a more complex multi-layer battery module 11 stacking structure; in addition, the parallel design not only improves the cooling efficiency of the liquid cooling module 12, but also reduces the impact caused by the performance difference of the single-layer liquid cooling plate, ensuring that the coolant can flow smoothly through the multi-layer liquid cooling plate, thereby ensuring the temperature consistency of the entire battery pack 1.

[0068] Please continue to combine Figures 1 to 5 ; In one embodiment, a plurality of the fourth liquid cooling plates 124, the first liquid cooling plates 121, and the second liquid cooling plates 122 are arranged at intervals along the first direction Z; the area of ​​the second liquid cooling plate 122 is equal to the area of ​​the first liquid cooling plate 121; the battery pack 1 includes a third battery module 113, and the third battery module 113 is arranged between the first liquid cooling plate 121 and the second liquid cooling plate 122.

[0069] It can be understood that, in this embodiment, the first liquid cooling plate 121 and the second liquid cooling plate 122 are respectively located at the top and the bottom of the third battery module 113, so as to achieve double-sided cooling of the third battery module 113, so that the coolant can effectively cover the entire surface of the third battery module 113, thereby improving the uniformity and efficiency of heat dissipation, preventing overheating in local areas of the battery pack 1, and improving the overall thermal management capability.

[0070] Specifically, the battery pack 1 includes a third battery module 113, and the third battery module 113 is arranged between the first liquid cooling plate 121 and the second liquid cooling plate 122. By locating the first liquid cooling plate 121 and the second liquid cooling plate 122 at the top and bottom of the third battery module 113 respectively, double-sided cooling of the third battery module 113 is achieved, so that the coolant can effectively cover the entire surface of the third battery module 113, thereby improving the uniformity and efficiency of heat dissipation, preventing overheating in local areas of the battery pack 1, and improving the overall thermal management capability.

[0071] In addition, the multiple first liquid-cooling channels 12293 arranged in parallel enable the coolant to pass through the liquid cooling plate faster, thereby expanding the cooling surface area of ​​the second liquid cooling plate 122 in contact with the third battery module 113, thereby effectively improving the cooling efficiency; and since the multiple first liquid-cooling channels 12293 are arranged in parallel, the coolant can be evenly distributed in each of the first liquid-cooling channels 12293, thereby avoiding local overheating or uneven cooling of the third battery module 113.

[0072] Please continue to combine Figures 1 to 5 In one embodiment, the third liquid cooling plate 123 is arranged above the first liquid cooling plate 121, and the third liquid cooling plate 123 and the fourth liquid cooling plate 124 are arranged at intervals, and the area of ​​the third liquid cooling plate 123 can be equal to the area of ​​the first liquid cooling plate 121; the battery pack 1 includes a fourth battery module 114, and the fourth battery module 114 is arranged between the fourth liquid cooling plate 124 and the third liquid cooling plate 123. By locating the third liquid cooling plate 123 and the fourth liquid cooling plate 124 at the top and bottom of the fourth battery module 114 respectively, double-sided cooling of the fourth battery module 114 is achieved, so that the coolant can effectively cover the entire surface of the fourth battery module 114, thereby improving the uniformity and efficiency of heat dissipation, preventing overheating in a local area of ​​the battery pack 1, and improving the overall thermal management capability.

[0073] In addition, the plurality of second liquid-cooling channels 1235 arranged in parallel enable the coolant to pass through the liquid-cooling plate faster, thereby expanding the cooling surface area of ​​the third liquid-cooling plate 123 in contact with the fourth battery module 114, thereby effectively improving the cooling efficiency; and since the plurality of second liquid-cooling channels 1235 are arranged in parallel, the coolant can be evenly distributed in each of the first liquid-cooling channels 12293, thereby avoiding local overheating or uneven cooling of the fourth battery module 114.

[0074] Please continue to combine Figures 1 to 5 In one embodiment, the third inlet 1241 and the third outlet 1242 may be located at the same end of the fourth liquid cooling plate 124, the first inlet 1211 and the first outlet 1212 may be located at the same end of the first liquid cooling plate 121, the first sub-inlet 1221, the first sub-outlet 1222, the second sub-inlet 1223 and the second sub-outlet 1224 may be located at the same end of the second liquid cooling plate 122, the second inlet 1231 and the second outlet 1232 may be located at the same end of the third liquid cooling plate 123, and the second inlet 1231 and the second outlet 1232 are located at an end of the third liquid cooling plate 123 close to the first liquid cooling plate 121.

[0075] Specifically, the third inlet 1241, the third outlet 1242, the first inlet 1211, the first outlet 1212, the first sub-inlet 1221, the first sub-outlet 1222, the second sub-inlet 1223, the second sub-outlet 1224, the first joint pipe assembly 125, and the second joint pipe assembly 126 are all arranged at the same end of the liquid cooling module 12.

[0076] It is understandable that the various cooling plates in the multi-layer battery pack 1 may require different pipeline directions due to their different heights and spacings. If the inlets and outlets and pipeline components are scattered at different ends, it will cause complex pipeline intersections and direction problems. This embodiment concentrates all the inlets and outlets and pipeline components at the same end of the liquid cooling module 12, so that the pipelines do not need to be extended or arranged from multiple directions during installation. The design of the pipelines can be simply adjusted according to the position of each layer of cooling plates to adapt to different numbers of layers and cooling requirements, thereby improving the compatibility of the liquid cooling module 12 and reducing the space occupied by the pipelines in the liquid cooling module 12, thereby achieving flexible layout of the pipelines in the multi-layer battery pack 1 structure, solving the pipeline layout problem when the space in the battery pack 1 is limited, and meeting the heat dissipation needs of the large-capacity battery pack 1.

[0077] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ;in, Figure 6 This is a schematic diagram of the first structure of the first joint provided in an embodiment of the present application.

[0078] In one embodiment, the first joint pipeline assembly 125 includes a plurality of interconnected first joints 1251, one of the first joints 1251 is connected to a third inlet 1241 of the fourth liquid cooling plate 124, and the first joint 1251 close to the first liquid cooling plate 121 among the plurality of first joints 1251 is connected to the first inlet 1211; the second joint pipeline assembly 126 includes a plurality of interconnected second joints 1261, one of the second joints 1261 is connected to a third outlet 1242 of the fourth liquid cooling plate 124, and the second joint 1261 close to the first liquid cooling plate 121 among the plurality of second joints 1261 is connected to the first outlet 1212.

[0079] It should be noted that adjacent first joints 1251, between the first joint 1251 and the third inlet 1241, between the first joint 1251 and the first inlet 1211, between adjacent second joints 1261, between the second joint 1261 and the third outlet 1242, and between the second joint 1261 and the first outlet 1212 can all be connected by pipelines.

[0080] Specifically, the first joint 1251 can be a three-way joint, and the first joint 1251 includes a first opening 12511, a second opening 12512 and a third opening 12513 that are connected to each other. The first opening 12511 of one first joint 1251 is connected to the third inlet 1241 of the fourth liquid cooling plate 124; along the first direction Z, among two adjacent first joints 1251, the second opening 12512 of one first joint 1251 is connected to the second opening 12512 of another first joint 1251 or the third opening 12513, thereby realizing the connection of multiple first joints 1251.

[0081] It can be understood that the three-way joint in the related art is usually assembled from multiple parts, and the sealing performance of the connection is easily affected by the installation accuracy and the use environment, which may cause leakage of the coolant. In this embodiment, the first joint 1251 is set to be a three-way joint. The first joint 1251 includes a first opening 12511, a second opening 12512 and a third opening 12513 that are connected to each other. By reducing the volume of the connecting part and optimizing the flow channel design, the expansion length and layout of the pipeline in the second direction X in the related art are reduced, thereby saving the internal space of the battery pack 1.

[0082] It should be noted that, in this embodiment, the second direction X is Figure 1 The second direction X may also be the length direction of the battery module 11; in addition, the structure of the second connector 1261 is the same as that of the first connector 1251, that is, the second connector 1261 may also be a three-way connector. For details, please refer to the above description of the first connector 1251, which will not be repeated in this embodiment.

[0083] It can be understood that, in this embodiment, a first joint 1251 is arranged to be connected to a third inlet 1241 of a fourth liquid cooling plate 124, a first joint 1251 close to the first liquid cooling plate 121 among multiple first joints 1251 is connected to the first inlet 1211, a second joint 1261 is connected to a third outlet 1242 of a fourth liquid cooling plate 124, and a second joint 1261 close to the first liquid cooling plate 121 among multiple second joints 1261 is connected to the first outlet 1212, so that multiple fourth liquid cooling plates 124 and one first liquid cooling plate 121 are arranged in parallel, and each liquid cooling plate can obtain a relatively uniform coolant flow rate, thereby ensuring that the cooling effect of the liquid cooling module 12 is more uniform, avoiding excessive local temperature differences, and thereby effectively improving the heat dissipation efficiency and temperature control performance of the liquid cooling module 12.

[0084] Furthermore, since the coolant is evenly distributed to multiple liquid cooling plates through the first joint pipe assembly 125, the overall pressure drop of the liquid cooling module 12 can be reduced. Therefore, the pipeline does not need to maintain the flow rate by reducing the diameter or bending. This embodiment allows the use of larger and straighter pipes to increase the flow rate and reduce the flow resistance. In addition, if the flow of a certain liquid cooling plate is too large, throttling control can be performed by adjusting the inlet and outlet pipe diameters of the first joint 1251, thereby further optimizing the flow uniformity.

[0085] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 ;in, Figure 7 A second structural schematic diagram of the first joint provided in an embodiment of the present application.

[0086] In one embodiment, the first joint pipe assembly 125 also includes a liquid inlet joint 12510 connected to one of the plurality of first joints 1251, and the liquid inlet joint 12510 is the inlet end of the cooling medium; the second joint pipe assembly 126 also includes a liquid outlet joint 12610 connected to one of the plurality of second joints 1261, and the liquid outlet joint 12610 is the outlet end of the cooling medium.

[0087] Since the liquid inlet connector 12510 can be connected to one of the multiple first connectors 1251, the flow direction of the coolant can be adjusted according to actual needs, thereby improving the flexibility and adaptability of the liquid cooling module 12; at the same time, by individually adjusting the position and size of the liquid inlet connector 12510, the coolant can flow through each cold plate in the optimal path to adapt to different battery pack 1 structural requirements and ensure a more uniform flow distribution in the entire liquid cooling module 12.

[0088] Furthermore, the liquid inlet connector 12510 and the first connector 1251 can be integrally formed; specifically, the liquid inlet connector 12510 and the first connector 1251 can be integrally formed by an injection molding process, thereby improving the overall sealing and connection reliability, thereby improving the efficiency of the coolant flow, and simplifying the assembly process.

[0089] It should be noted that, in this embodiment, the structure of the liquid outlet connector 12610 is the same as the structure of the liquid inlet connector 12510, that is, the liquid outlet connector 12610 can be connected to one of the multiple second connectors 1261, and the liquid outlet connector 12610 and the second connector 1261 can also be integrally formed through an injection molding process. Please refer to the above description of the liquid inlet connector 12510 for details, and this embodiment will not go into details.

[0090] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 ;in, Figure 8 A schematic structural diagram of the first connecting joint provided in an embodiment of the present application.

[0091] In one embodiment, the first joint pipeline assembly 125 also includes a first connecting joint 1253, which is arranged on a side of the first joint pipeline assembly 125 away from the first liquid cooling plate 121, one end of the first connecting joint 1253 is communicated with a third inlet 1241 of a fourth liquid cooling plate 124, and the other end of the first connecting joint 1253 is connected to a first joint 1251; the second joint pipeline assembly 126 also includes a second connecting joint 1263, which is arranged on a side of the second joint pipeline assembly 126 away from the first liquid cooling plate 121, one end of the second connecting joint 1263 is communicated with a third outlet 1242 of a fourth liquid cooling plate 124, and the other end of the second connecting joint 1263 is connected to a second joint 1261.

[0092] Specifically, the plurality of fourth liquid cooling plates 124 are arranged at intervals along the first direction Z, and the first liquid cooling plate 121 is arranged above the fourth liquid cooling plate 124, wherein the fourth liquid cooling plate 124 on the side away from the first liquid cooling plate 121 among the plurality of fourth liquid cooling plates 124 is in contact with the bottom plate 141141 of the box body (not shown in the figure) of the battery pack 1, and the first connecting joint 1253 and the second connecting joint 1263 are both arranged corresponding to the fourth liquid cooling plate 124 on the side away from the first liquid cooling plate 121 among the plurality of fourth liquid cooling plates 124, that is, the first connecting joint 1253 and the second connecting joint 1263 are connected to the same fourth liquid cooling plate 124.

[0093] Further, the first connecting joint 1253 can be a two-way joint, the first connecting joint 1253 includes a fourth opening 12531 and a fifth opening 12532 that are connected to each other, the fourth opening 12531 of the first connecting joint 1253 is connected to a third inlet 1241 of the fourth liquid cooling plate 124, and the fifth opening 12532 of the first connecting joint 1253 is connected to the second opening 12512 of the first joint 1251 or is connected to the third opening 12513.

[0094] It should be noted that, in this embodiment, the structure of the second connecting joint 1263 is the same as the structure of the first connecting joint 1253, that is, the second connecting joint 1263 can be a two-way joint. Please refer to the above description of the first connecting joint 1253 for details, and this embodiment will not repeat it.

[0095] It can be understood that, in this embodiment, one end of the first connecting joint 1253 is connected to the third inlet 1241 of the fourth liquid cooling plate 124, the other end of the first connecting joint 1253 is connected to the first joint 1251, one end of the second connecting joint 1263 is connected to the third outlet 1242 of the fourth liquid cooling plate 124, and the other end of the second connecting joint 1263 is connected to the second joint 1261, so that the connection between adjacent fourth liquid cooling plates 124 can adopt a more linear pipeline layout, reduce pipeline bending, and improve the efficiency of coolant flow and flow control.

[0096] Please continue to combine Figures 1 to 8In one embodiment, the first joint pipeline assembly 125 includes a third joint 1252, which is arranged between the first liquid cooling plate 121 and the second liquid cooling plate 122, and the third joint 1252 is respectively connected to the first sub-inlet 1221, the second sub-inlet 1223, the first inlet 1211 and the first joint 1251; the second joint pipeline assembly 126 includes a fourth joint 1262, which is arranged between the first liquid cooling plate 121 and the second liquid cooling plate 122, and the fourth joint 1262 is respectively connected to the first sub-outlet 1222, the second sub-outlet 1224, the first outlet 1212 and the second joint 1261.

[0097] Specifically, the third joint 1252 can be a three-way joint, and the third joint 1252 can be connected to the first sub-inlet 1221, the second sub-inlet 1223, the first inlet 1211 and a first joint 1251 respectively through multiple pipelines; wherein, the pipeline connecting the third joint 1252 and the first sub-inlet 1221 can be a first branch pipeline, and the first branch pipeline is respectively connected to the third joint 1252, the first sub-inlet 1221, and the first inlet 1211, so as to realize that the liquid cooling liquid flows into the first liquid cooling plate 121 and the second liquid cooling plate 122 through the first joint 1251 and the third joint 1252.

[0098] The fourth joint 1262 can be a three-way joint, and the fourth joint 1262 can be connected to the first sub-outlet 1222, the second sub-outlet 1224, the first outlet 1212 and a second joint 1261 through multiple pipelines; wherein, the pipeline connecting the fourth joint 1262 and the first sub-outlet 1222 can be a second branch pipeline, and the second branch pipeline is respectively connected to the fourth joint 1262, the first sub-outlet 1222, and the first outlet 1212, so that the liquid cooling liquid flows out of the first liquid cooling plate 121 and the second liquid cooling plate 122 through the fourth joint 1262 and the second joint 1261.

[0099] It can be understood that this embodiment reasonably distributes the coolant between the first liquid cooling plate 121 and the second liquid cooling plate 122 by setting the third joint 1252 and the fourth joint 1262, thereby simplifying the connection of the multi-layer cooling plates, effectively solving the problem of how to efficiently connect the cooling plates in the multi-layer structure, reducing the use of additional pipelines, and reducing the complexity of the liquid cooling module 12.

[0100] Furthermore, the first joint pipeline assembly 125 also includes a first pipeline 1254 arranged between the first liquid cooling plate 121 and the third liquid cooling plate 123, and the second joint pipeline assembly 126 also includes a second pipeline 1264 arranged between the first liquid cooling plate 121 and the third liquid cooling plate 123; wherein the first pipeline 1254 and the second pipeline 1264 are arranged at intervals.

[0101] A first through hole 1225 is provided on the side of the first liquid inlet channel 1227 away from the first sub-inlet 1221, and a second through hole 1226 is provided on the side of the first liquid outlet channel 1228 away from the first sub-outlet 1222. One end of the first pipeline 1254 is connected to the first through hole 1225, and the other end of the first pipeline 1254 extends from the first liquid inlet channel 1227 toward the direction close to the second inlet 1231, and the other end of the first pipeline 1254 is connected to the second inlet 1231; one end of the second pipeline 1264 is connected to the second through hole 1226, and the other end of the second pipeline 1264 extends from the first liquid outlet channel 1228 toward the direction close to the second outlet 1232, and the other end of the second pipeline 1264 is connected to the second outlet 1232.

[0102] Specifically, the first pipeline 1254 includes a first straight segment 12541, a second straight segment 12542, a third straight segment 12543, a first bent segment 12544, and a second bent segment 12545; wherein one end of the first straight segment 12541 is connected to the first liquid inlet channel 1227, and the other end of the first straight segment 12541 extends from the second liquid cooling plate 122 to the direction close to the first liquid cooling plate 121, and is connected to one end of the first bent segment 12544; the first bent segment 12544 The other end of the second straight line segment 12542 is connected to the second straight line segment 12542, the other end of the second straight line segment 12542 extends from the first liquid cooling plate 121 toward the direction close to the third liquid cooling plate 123, and is connected to one end of the second bending segment 12545; the other end of the second bending segment 12545 is connected to one end of the third straight line segment 12543, the other end of the third straight line segment 12543 extends from the second bending segment 12545 toward the direction close to the third liquid cooling plate 123, and is connected to the second inlet 1231.

[0103] It should be noted that the structure of the second pipeline 1264 is the same as that of the first pipeline 1254. The structure of the first pipeline 1254 has been described in detail in this embodiment, so it will not be repeated here.

[0104] It can be understood that this embodiment simplifies the design and manufacturing process by adopting the first pipeline 1254 and the second pipeline 1264, which is conducive to standardized production and reduces manufacturing costs and maintenance difficulties. In addition, the unified pipeline structure can ensure that the flow characteristics of the coolant in each part are consistent, further improving the stability and cooling effect of the cooling system.

[0105] Please continue to combine Figures 1 to 8 In one embodiment, the second battery module 112 and the third battery module 113 are stacked, the fourth battery module 114 and the third battery module 113 are in the same layer and are spaced apart, a groove 13 is formed between the third battery module 113 and the fourth battery module 114, the first pipeline 1254 and the second pipeline 1264 are arranged between the fourth battery module 114 and the third battery module 113, and the first pipeline 1254 and the second pipeline 1264 extend along the side of the groove 13, so that the setting of the first pipeline 1254 and the second pipeline 1264 utilizes the unused gap space in the battery pack 1, improves the compactness of the overall layout, and avoids interference between the pipeline and other components of the battery pack 1.

[0106] At the same time, by setting pipelines between adjacent battery modules 11, the coolant is transferred from the third liquid cooling plate 123 to the fourth liquid cooling plate 124, thereby avoiding the problem of pipeline crossing and maintaining the simplicity and easy maintainability of the liquid cooling module 12.

[0107] Please continue to combine Figures 1 to 8 In one embodiment, the cooling module further includes a plurality of quick-connect plugs 127, one quick-connect plug 127 corresponding to one of the first inlets 1211, one quick-connect plug 127 corresponding to one of the first outlets 1212, one quick-connect plug 127 corresponding to one of the second inlets 1231, one quick-connect plug 127 corresponding to one of the second outlets 1232, one quick-connect plug 127 corresponding to one of the first sub-inlets 1221, one quick-connect plug 127 corresponding to one of the first sub-outlets 1222, one quick-connect plug 127 corresponding to one of the second sub-inlets 1223, one quick-connect plug 127 corresponding to one of the second sub-outlets 1224, one quick-connect plug 127 corresponding to one of the third inlets 1241, and one quick-connect plug 127 corresponding to one of the third outlets 1242.

[0108] Specifically, one of the first joints 1251 is connected to the third inlet 1241 through one of the quick-connect plugs 127, and one of the second joints 1261 is connected to the third outlet 1242 through one of the quick-connect plugs 127; one of the third joints 1252 is connected to the first sub-inlet 1221 through one of the quick-connect plugs 127, one of the third joints 1252 is connected to the first sub-outlet 1222 through one of the quick-connect plugs 127, and one of the third joints 1252 is connected to the first inlet 1211 through one of the quick-connect plugs 127; one of the fourth joints 1262 is connected to the first sub-outlet 1222 through one of the quick-connect plugs 127, one of the fourth joints 1262 is connected to the second sub-outlet 1224 through one of the quick-connect plugs 127, and one of the fourth joints 1262 is connected to the first outlet 1212 through one of the quick-connect plugs 127.

[0109] It can be understood that this embodiment simplifies the connection method of the pipes by providing the quick-connect plug 127, avoids the complicated threaded connection or other fixing methods in related designs, simplifies the installation process of the liquid cooling module 12, and reduces the space requirements for pipe connections and turns, making the layout of the entire system more compact, especially for the cooling module designed for the multi-layer battery module 11, which can effectively save the layout space in the second direction X, making the design of the battery pack 1 more flexible.

[0110] Please continue to combine Figure 1 , Figure 2 and Fig. 9 ;in, Fig. 9 This is a schematic diagram of the structure of the first liquid cooling plate provided in an embodiment of the present application.

[0111] In one embodiment, the fourth liquid cooling plate 124 can be an extruded liquid cooling plate; it is understandable that for a battery pack 1 with a multi-layer structure, it is usually necessary to set up multiple cooling plates. The extruded liquid cooling plate adopts an extrusion molding process, which is characterized by high efficiency and low cost. Therefore, the first liquid cooling plate 121 can be produced quickly and in large quantities, thereby reducing the manufacturing cost of the liquid cooling module 12.

[0112] Specifically, the fourth liquid cooling plate 124 is provided with a fourth liquid inlet channel 1243, a fourth liquid outlet channel 1244, and a plurality of third liquid cooling channels 1245 arranged in series, one end of the fourth liquid inlet channel 1243 is connected to the third inlet 1241, the other end of the fourth liquid inlet channel 1243 is connected to one end of the third liquid cooling channel 1245, the other end of the third liquid cooling channel 1245 is connected to one end of the fourth liquid outlet channel 1244, and the other end of the fourth liquid outlet channel 1244 is connected to the third outlet 1242, thereby ensuring that the coolant can be evenly distributed in the first liquid cooling plate 121, thereby improving the cooling effect of the entire liquid cooling module 12; at the same time, the extruded liquid cooling plate can directly form the fourth liquid inlet channel 1243, the fourth liquid outlet channel 1244, and the third liquid cooling channel 1245 through an extrusion process, thereby further reducing the production cost of the first liquid cooling plate 121.

[0113] Specifically, the fourth liquid inlet channels 1243 of two adjacent fourth liquid cooling plates 124 are connected, and the fourth liquid outlet channels 1244 of two adjacent fourth liquid cooling plates 124 are connected, which reduces the complex pipeline structure, makes the installation process of multiple fourth liquid cooling plates 124 simpler, and reduces the installation cost and maintenance cost of multiple fourth liquid cooling plates 124.

[0114] Furthermore, the fourth liquid inlet channel 1243, the fourth liquid outlet channel 1244 and the third liquid cooling channel 1245 are all linear channel structures; it can be understood that the use of a linear channel structure can reduce the friction and resistance of the coolant in the channel, ensuring that the coolant can pass through each channel smoothly, so that the coolant can flow quickly with less energy consumption, thereby improving the flow efficiency of the entire system; and the design of the linear channel simplifies the manufacturing process and reduces the processing difficulty and cost brought about by the complex channel design.

[0115] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A liquid cooling module, characterized in that: include: A second liquid cooling plate having a flow channel therein; The third liquid cooling plate is spaced apart from the second liquid cooling plate, and the third liquid cooling plate is provided with a first cooling part, which is communicated with the flow channel to introduce cooling liquid into the first cooling part and / or to discharge cooling liquid from the first cooling part.

2. The liquid cooling module according to claim 1, characterized in that: The flow channel includes a first liquid inlet flow channel and a first liquid outlet flow channel, the second liquid cooling plate is further provided with a second cooling portion located between the first liquid inlet flow channel and the first liquid outlet flow channel, and the second liquid cooling plate includes a first sub-inlet, a first sub-outlet, a second sub-inlet and a second sub-outlet; Among them, one end of the second cooling part is connected to the second sub-inlet, and the other end of the second cooling part is connected to the second sub-outlet; one end of the first liquid inlet channel is connected to the first sub-inlet, and the other end of the first liquid inlet channel is connected to one end of the first cooling part, one end of the first liquid outlet channel is connected to the first sub-outlet, and the other end of the first liquid outlet channel is connected to the other end of the first cooling part.

3. The liquid cooling module according to claim 2, characterized in that: The second cooling part comprises a second liquid inlet channel, a second liquid outlet channel, and a plurality of first liquid cooling channels arranged in parallel; One end of the second liquid inlet channel is connected to the second sub-inlet, the other end of the second liquid inlet channel is connected to one end of the plurality of first liquid cooling channels, the other end of the plurality of first liquid cooling channels is connected to one end of the second liquid outlet channel, and the other end of the first liquid outlet channel is connected to the second sub-outlet.

4. The liquid cooling module according to claim 3, characterized in that: The first liquid inlet flow channel is not connected to the second liquid inlet flow channel, and / or the first liquid outlet flow channel is not connected to the second liquid outlet flow channel.

5. The liquid cooling module according to any one of claims 2 to 4, characterized in that: The third liquid cooling plate comprises a second inlet and a second outlet, and the first cooling part comprises a third liquid inlet channel, a third liquid outlet channel, and a plurality of second liquid cooling channels arranged in parallel; Among them, one end of the third liquid inlet channel is connected to the second inlet, the other end of the third liquid inlet channel is connected to one end of multiple second liquid cooling channels, the other end of multiple second liquid cooling channels is connected to one end of the third liquid outlet channel, and the other end of the third liquid outlet channel is connected to the second outlet.

6. The liquid cooling module according to claim 5, characterized in that: The other end of the first liquid inlet channel is connected to the second inlet, and the other end of the first liquid outlet channel is connected to the second outlet.

7. The liquid cooling module according to claim 5, characterized in that: The first liquid inlet flow channel, the first liquid outlet flow channel, the third liquid inlet flow channel and the third liquid outlet flow channel are all linear flow channel structures.

8. The liquid cooling module according to claim 5, characterized in that: The liquid cooling module also includes: A first liquid cooling plate is arranged below the second liquid cooling plate, wherein the first liquid cooling plate and the third liquid cooling plate are arranged in the same layer and spaced apart; A first joint pipe assembly is arranged at one end of the plurality of first liquid cooling plates; A second joint pipe assembly is arranged at the other end of the plurality of first liquid cooling plates; The first liquid cooling plate includes a first inlet and a first outlet, the first joint pipe assembly connects the first inlet, the first sub-inlet and the second sub-inlet, and the second joint pipe assembly connects the first outlet, the first sub-outlet and the second sub-outlet.

9. The liquid cooling module according to claim 8, characterized in that: The liquid cooling module also includes: a plurality of fourth liquid cooling plates, arranged on a side of the first liquid cooling plate away from the second liquid cooling plate, the plurality of fourth liquid cooling plates being arranged at intervals along the first direction, the fourth liquid cooling plates comprising a third inlet and a third outlet; Wherein, the first joint pipe assembly is connected to the third inlet, and the second joint pipe assembly is connected to the third outlet.

10. The liquid cooling module according to claim 9, characterized in that: The first joint pipeline assembly includes a plurality of interconnected first joints, one of the first joints is connected to a third inlet of the fourth liquid cooling plate, and the first joint close to one side of the first liquid cooling plate among the plurality of first joints is connected to the first inlet; The second joint pipeline assembly includes a plurality of interconnected second joints, one of the second joints is connected to a third outlet of the fourth liquid cooling plate, and the second joint close to the first liquid cooling plate among the plurality of second joints is connected to the first outlet.

11. The liquid cooling module according to claim 10, characterized in that: The first joint pipeline assembly includes a third joint, the third joint is arranged between the first liquid cooling plate and the second liquid cooling plate, and the third joint is respectively connected to the first sub-inlet, the second sub-inlet, the first inlet and the first joint; The second joint pipeline assembly includes a fourth joint, which is arranged between the first liquid cooling plate and the second liquid cooling plate, and the fourth joint is respectively connected to the first sub-outlet, the second sub-outlet, the first outlet and the second joint.

12. The liquid cooling module according to claim 9, characterized in that: The fourth liquid cooling plate is provided with a fourth liquid inlet channel, a fourth liquid outlet channel, and a plurality of third liquid cooling channels arranged in series, one end of the fourth liquid inlet channel is connected to the third inlet, the other end of the fourth liquid inlet channel is connected to one end of the third liquid cooling channel, the other end of the third liquid cooling channel is connected to one end of the fourth liquid outlet channel, and the other end of the fourth liquid outlet channel is connected to the third outlet; Among them, the fourth liquid inlet channels of two adjacent first liquid cooling plates are connected, and the fourth liquid outlet channels of two adjacent first liquid cooling plates are connected.

13. The liquid cooling module according to claim 8, characterized in that: The first joint pipeline assembly also includes a first pipeline arranged between the second liquid cooling plate and the third liquid cooling plate, one end of the first pipeline is connected to the first liquid inlet channel, and the other end of the first pipeline extends from the second liquid cooling plate in a direction close to the first liquid cooling plate, and is connected to the second inlet after bending.

14. The liquid cooling module according to claim 13, characterized in that: The first pipeline includes a first straight segment, a second straight segment, a third straight segment, a first bending segment, and a second bending segment; Among them, one end of the first straight line segment is connected to the first liquid inlet channel, and the other end of the first straight line segment extends from the second liquid cooling plate to the direction close to the first liquid cooling plate, and is connected to one end of the first bending segment; the other end of the first bending segment is connected to the second straight line segment, and the other end of the second straight line segment extends from the first liquid cooling plate to the direction close to the third liquid cooling plate, and is connected to one end of the second bending segment; the other end of the second bending segment is connected to one end of the third straight line segment, and the other end of the third straight line segment extends from the second bending segment to the direction close to the third liquid cooling plate, and is connected to the second inlet.

15. A battery pack, characterized in that: It comprises a battery module and a liquid cooling module as claimed in any one of claims 1 to 14; wherein the battery module is arranged between adjacent liquid cooling plates.

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