Liquid cooling system and battery pack

Abstract

The utility model provides a kind of liquid cooling system and battery pack, liquid cooling system includes first liquid cooling component and second liquid cooling component, first liquid cooling component includes multiple first liquid cooling parts, and multiple first liquid cooling parts are used to heat exchange to the top of multiple battery modules, multiple first liquid cooling parts are connected in parallel, second liquid cooling component includes multiple second liquid cooling parts, multiple second liquid cooling parts are used to heat exchange to the side of multiple battery modules, the heat dissipation mode that top and side combine, can more comprehensively cover the heat dissipation area of battery module, effectively reduce the heat generated in the working process of battery module, wherein, every second liquid cooling part is connected in series with at least one first liquid cooling part, and the delivery direction of heat exchange liquid of every second liquid cooling part is parallel with the delivery direction of heat exchange liquid of first liquid cooling part connected in series and is reversely arranged, so that the delivery path of heat exchange liquid can form U-shaped loop, simplify the pipeline setting of liquid cooling system, reduce the temperature difference of different parts of battery module.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically to a liquid cooling system and a battery pack. Background Technology

[0002] Temperature is a crucial factor affecting the safety and performance of battery packs. Battery packs typically consist of multiple battery modules and a liquid cooling system for cooling these modules. To improve the cooling efficiency of these modules, related technologies utilize multiple liquid cooling plates to cool the top and sides of the battery modules separately. However, the piping layout of these multiple liquid cooling plates is complex, and significant temperature differences exist between different parts of the battery module after cooling. Utility Model Content

[0003] The present invention provides a liquid cooling system and battery pack, which aims to solve the problem that in the prior art, multiple liquid cooling plates are used to cool the top and sides of the battery module respectively. However, the piping of multiple liquid cooling plates is relatively complicated, and there is a large temperature difference between different parts of the battery module after cooling.

[0004] In a first aspect, embodiments of the present invention provide a liquid cooling system.

[0005] In one embodiment, the liquid cooling system includes:

[0006] The first liquid cooling assembly includes a plurality of first liquid cooling sections, which are used to exchange heat on the top of a plurality of battery modules. Each first liquid cooling section is used to transport heat exchange fluid, and the plurality of first liquid cooling sections are arranged in parallel.

[0007] The second liquid cooling assembly includes a plurality of second liquid cooling sections for heat exchange on the sides of the plurality of battery modules. Each second liquid cooling section is used to transport heat exchange fluid. Each second liquid cooling section is connected in series with at least one first liquid cooling section, and the transport direction of the heat exchange fluid in each second liquid cooling section is parallel to and opposite to the transport direction of the heat exchange fluid in the series-connected first liquid cooling sections.

[0008] In one embodiment, a plurality of the first liquid cooling sections are arranged at intervals along a first direction, and a clearance gap is formed between two adjacent first liquid cooling sections. The clearance gap is used to avoid the explosion-proof valve of the battery module.

[0009] In one embodiment, the system further includes a first connecting pipe, which includes a first connecting main pipe and a plurality of first connecting branch pipes connected to the first connecting main pipe. The first connecting main pipe is used for the input of heat exchange fluid, and the plurality of first connecting branch pipes are respectively connected to a plurality of first liquid cooling units.

[0010] In one embodiment, a plurality of first liquid cooling units and a plurality of second liquid cooling units are provided in a one-to-one correspondence;

[0011] The liquid cooling system also includes multiple first adapters, and each first liquid cooling unit and its corresponding second liquid cooling unit are connected in series through the first adapter.

[0012] In one embodiment, the first adapter includes a first connector disposed in the first liquid cooling section and a second connector disposed in the second liquid cooling section, wherein the first connector and the second connector are sleeved together.

[0013] In one embodiment, a sealing ring is further included, which is elastically connected between the first connector and the second connector to seal the gap between the first connector and the second connector.

[0014] In one embodiment, the plurality of first liquid cooling sections include a first cooling section for top thermally conductive connection to two adjacent battery modules.

[0015] In one embodiment, the first cooling section includes:

[0016] At least two harmonica tubes are arranged at intervals along the first direction, and at least two of the harmonica tubes are used for top thermal connection to two adjacent battery modules.

[0017] Two current collectors are disposed at both ends of at least two of the harmonica tubes, and each current collector is connected to the end of at least two of the harmonica tubes.

[0018] In one embodiment, the plurality of battery modules includes two first battery modules located at the edges;

[0019] The plurality of first liquid cooling sections also include two second cooling sections, which are used for top thermally conductive connection to the adjacent edge of the first battery module.

[0020] In one embodiment, a second connecting pipe is further included, which includes a plurality of second connecting branch pipes and a second connecting main pipe connected to the plurality of second connecting branch pipes. The plurality of second connecting branch pipes are respectively connected to a plurality of second liquid cooling sections, and the second connecting main pipe is used to output the heat exchange fluid after heat exchange.

[0021] In one embodiment, the side portion of the battery module has two first side surfaces disposed opposite to each other along the first direction;

[0022] Along the first direction, two adjacent second liquid cooling sections are used to exchange heat with the two first side surfaces.

[0023] In one embodiment, the plurality of second liquid cooling units include a second main cooling unit positioned between the two battery modules. The second main cooling unit has two heat exchange surfaces disposed opposite to each other along a first direction, the two heat exchange surfaces being used to exchange heat with the two battery modules respectively.

[0024] In one embodiment, a third liquid cooling component is also included for heat exchange at the bottom of the plurality of battery modules.

[0025] In one embodiment, the third liquid cooling component is arranged in parallel with the second liquid cooling component.

[0026] Secondly, this application also provides a battery pack, the battery pack comprising:

[0027] Multiple battery modules;

[0028] The liquid cooling system described above is used to exchange heat between the multiple battery modules.

[0029] In one embodiment, a third liquid cooling assembly is thermally connected to the bottom of the plurality of battery modules;

[0030] The housing provides a mounting space for the multiple battery modules and the liquid cooling system;

[0031] The third liquid cooling component is integrated with the bottom of the housing.

[0032] In one embodiment, an expansion beam is also included, which is installed inside the housing to divide the inner cavity of the housing into a first compartment and a second compartment. The expansion beam is provided with a plurality of clearance openings connecting the first compartment and the second compartment. The first compartment is for mounting a plurality of battery modules.

[0033] The liquid cooling system further includes a second connecting pipe, which is at least partially located in the second compartment and is adapted to pass through the plurality of the clearance openings and connect to the plurality of the second liquid cooling units.

[0034] The beneficial effects of the embodiments of this utility model are as follows:

[0035] In embodiments of this invention, multiple first liquid cooling sections of the first liquid cooling assembly exchange heat with the top of the battery module, and multiple second liquid cooling sections of the second liquid cooling assembly exchange heat with the sides of the battery module. This combined top and side heat dissipation method can more comprehensively cover the heat dissipation area of ​​the battery module, effectively reducing the heat generated by the battery module during operation, ensuring stable operation of the battery module within a suitable temperature range, thereby extending the service life of the battery module and improving the stability of its performance. Each first and second liquid cooling section is used to transport heat exchange fluid, which carries away the heat generated by the battery module. The parallel connection of the first liquid cooling sections ensures that each section has a relatively stable flow rate and pressure, ensuring uniform heat dissipation to various parts of the top of the battery module. In addition, the parallel arrangement of the first liquid cooling sections allows for independent control or unified adjustment of the heat exchange fluid flow rate of each section, facilitating precise allocation of the heat exchange fluid flow rate according to the heat dissipation needs of different areas on the top of the battery module. The second liquid cooling unit, connected in series with the first liquid cooling unit, creates an orderly flow path for the heat exchange fluid within the liquid cooling system. This enhances the heat exchange efficiency between the heat exchange fluid and the battery module, further improving heat dissipation. The heat exchange fluid delivery direction of each second liquid cooling unit is parallel to and opposite to that of the first liquid cooling unit connected in series. This design allows the heat exchange fluid delivery path to form a U-shaped loop, simplifying the piping layout of the liquid cooling system and reducing temperature differences between different parts of the battery module caused by temperature differences between the upstream and downstream of the heat exchange fluid, thereby extending the overall lifespan of the battery module. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the liquid cooling system (from one perspective) provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the liquid cooling system (from another perspective) provided in an embodiment of this utility model;

[0039] Figure 3 yes Figure 2 A magnified view of part A shown below;

[0040] Figure 4 This is a cross-sectional schematic diagram of the liquid cooling system provided in an embodiment of this utility model;

[0041] Figure 5 yes Figure 4A magnified view of part B shown below;

[0042] Figure 6 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0043] Figure 7 This is a cross-sectional schematic diagram of the battery pack provided in an embodiment of this utility model;

[0044] Figure 8 This is a schematic diagram of the structure of a battery pack (partial structure) provided in an embodiment of this utility model.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Battery pack; 10. Liquid cooling system; 1. First liquid cooling assembly; 11. First liquid cooling section; 11a. First cooling section; 111. Harmonica tube; 112. Current collector; 11b. Second cooling section; 2. Second liquid cooling assembly; 21. Second liquid cooling section; 21a. Second main cooling section; 211. Heat exchange surface; 3. Clearance gap; 4. First connecting pipe; 41. First connecting main pipe; 42. First connecting branch pipe; 5. First adapter; 51. First connector; 52. Second connector; 6. Sealing ring; 7. Second connecting pipe; 8. Third liquid cooling assembly; 9. Second adapter; 20. Battery module; 20a. First battery module; 201. Explosion-proof valve; 202. First side; 30. Housing; 301. First compartment; 302. Second compartment; 40. Expansion beam; 401. Clearance opening. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0048] A liquid cooling system generally includes a battery cell, a housing containing the battery cell, a liquid cooling system sealed onto the housing, and an electrolyte filled within the housing. The liquid cooling system itself has a significant impact on the system's safety. Since the liquid cooling system is used to seal the housing, it needs to have excellent sealing performance to prevent air and moisture from entering the housing and to prevent electrolyte leakage. In related technologies, liquid cooling systems typically incorporate a sealing ring sandwiched between a welding ring and the sidewall of the electrode post. This results in a sealing barrier only forming at the connection between the electrode post and the welding ring on the sidewall of the electrode post, leading to relatively poor sealing performance of the liquid cooling system.

[0049] In view of this, the present invention proposes a liquid cooling system. Figures 1 to 5 This is a schematic diagram of an embodiment of the liquid cooling system provided by this utility model. The liquid cooling system provided by this utility model enables uninterrupted hydrogen supply during the drying process. The liquid cooling system will be described in detail below with reference to the main accompanying drawings.

[0050] Reference Figure 1 and Figure 2 The liquid cooling system 10 includes a first liquid cooling component 1 and a second liquid cooling component 2. The first liquid cooling component 1 includes a plurality of first liquid cooling sections 11, which are used to exchange heat on the top of a plurality of battery modules 20. The plurality of first liquid cooling sections 11 are arranged in parallel, and each first liquid cooling section 11 is used to transport heat exchange fluid. The second liquid cooling component 2 includes a plurality of second liquid cooling sections 21, which are used to exchange heat on the sides of the plurality of battery modules 20. Each second liquid cooling section 21 is used to transport heat exchange fluid. Each second liquid cooling section 21 is arranged in series with at least one first liquid cooling section 11. The transport direction of the heat exchange fluid in each second liquid cooling section 21 is parallel to and opposite to the transport direction of the heat exchange fluid in the series-connected first liquid cooling sections 11.

[0051] In this embodiment of the invention, multiple first liquid cooling sections 11 of the first liquid cooling assembly 1 exchange heat with the top of the battery module 20, and multiple second liquid cooling sections 21 of the second liquid cooling assembly 2 exchange heat with the sides of the battery module 20. This combined top and side heat dissipation method can more comprehensively cover the heat dissipation area of ​​the battery module 20, effectively reducing the heat generated by the battery module 20 during operation, ensuring stable operation of the battery module 20 within a suitable temperature range, thereby extending the service life of the battery module and improving the stability of its performance. Each first liquid cooling section 11 and second liquid cooling section 21 is used to transport heat exchange fluid, which carries away the heat generated by the battery module 20 through its flow. The parallel connection of the first liquid cooling sections 11 ensures that each liquid cooling section has a relatively stable flow rate and pressure, ensuring uniform heat dissipation to all parts of the top of the battery module 20. Furthermore, the parallel arrangement of the first liquid cooling units 11 allows for independent control or unified adjustment of the heat exchange fluid flow rate of each unit, facilitating precise allocation of the heat exchange fluid flow rate according to the heat dissipation requirements of different areas on the top of the battery module 20. The series-connected second liquid cooling units 21, working in conjunction with the first units 11, create an orderly flow path for the heat exchange fluid within the liquid cooling system, enhancing the heat exchange efficiency between the heat exchange fluid and the battery module 20 and further improving the heat dissipation effect. The heat exchange fluid delivery direction of each second liquid cooling unit 21 is parallel and opposite to that of the series-connected first liquid cooling units 11. This design allows the heat exchange fluid delivery path to form a U-shaped loop, simplifying the piping layout of the liquid cooling system.

[0052] Furthermore, since the heat exchange fluid transport direction of each second liquid cooling section 21 is parallel to and opposite to the heat exchange fluid transport direction of the first liquid cooling section 11 connected in series, the temperature of the heat exchange fluid upstream in the first liquid cooling section 11 is lower, and the temperature of the heat exchange fluid downstream after heat exchange is higher. Correspondingly, along the heat exchange fluid transport direction of the second liquid cooling section 21, the temperature of the heat exchange fluid upstream in the second liquid cooling section 21 is lower, and the temperature of the heat exchange fluid downstream after heat exchange is higher. Since the temperature of the upstream heat exchange fluid in the first liquid cooling section 11 corresponds to the temperature of the downstream heat exchange fluid in the second liquid cooling section 21, and the temperature of the downstream heat exchange fluid in the first liquid cooling section 11 corresponds to the temperature of the upstream heat exchange fluid in the second liquid cooling section 21, the temperature difference between different parts of the battery module is reduced, thereby extending the overall service life of the battery module.

[0053] Reference Figure 1 and Figure 2In some embodiments, multiple first liquid cooling sections 11 are spaced apart along a first direction, with a clearance gap 3 formed between adjacent first liquid cooling sections 11. This clearance gap 3 is used to avoid the explosion-proof valve 201 of the battery module 20. Thus, the explosion-proof valve 201 of the battery module 20 is a crucial safety device. When the internal pressure of the battery module 20 abnormally increases, the explosion-proof valve 201 will open promptly to release the pressure, preventing dangerous situations such as explosions. The multiple first liquid cooling sections 11 spaced apart along the first direction and forming clearance gaps 3 ensure that the explosion-proof valve 201 is not obstructed by the liquid cooling sections when it needs to open, allowing it to function normally for pressure relief, greatly improving the safety of the battery module 20 and even the entire battery system. Because clearance gaps 3 are provided between the first liquid cooling sections 11, installers can more easily assemble the liquid cooling system 10 with the battery module 20 without worrying about interference between the explosion-proof valve 201 and the liquid cooling sections. This greatly simplifies the installation process, improves installation efficiency, and reduces the risk of errors or damage during installation.

[0054] Reference Figure 4 In some embodiments, the liquid cooling system 10 further includes a first connecting pipe 4, which includes a first connecting main pipe 41 and a plurality of first connecting branch pipes 42 connected to the first connecting main pipe 41. The first connecting main pipe 41 is used for the input of heat exchange fluid, and the plurality of first connecting branch pipes 42 are respectively connected to a plurality of first liquid cooling sections 11. Thus, the first connecting main pipe 41 serves as the input channel for heat exchange fluid, enabling the concentrated introduction of heat exchange fluid into the liquid cooling system 10. The plurality of first connecting branch pipes 42 are respectively connected to a plurality of first liquid cooling sections 11, thereby distributing the heat exchange fluid to each of the first liquid cooling sections 11 and ensuring that each first liquid cooling section 11 receives an appropriate amount of heat exchange fluid, thereby achieving more balanced heat dissipation on the top of the battery module 20, avoiding excessive or insufficient heat dissipation in some areas, and improving the overall heat dissipation efficiency. Compared with a complex pipeline network, the structure of the first connecting main pipe 41 and the plurality of first connecting branch pipes 42 reduces the bends and branch points of the heat exchange fluid in the pipeline, thereby reducing flow resistance. Lower flow resistance means that the heat exchange fluid can flow in the pipeline at a faster speed and with less pressure loss, which is beneficial to improving the circulation efficiency of the heat exchange fluid and enabling the heat exchange fluid to remove the heat generated by the battery module 20 more quickly, further improving the heat dissipation effect.

[0055] Reference Figure 4In some embodiments, multiple first liquid cooling units 11 and multiple second liquid cooling units 21 are arranged in a one-to-one correspondence. The liquid cooling system 10 also includes multiple first adapters 5, with each first liquid cooling unit 11 and its corresponding second liquid cooling unit 21 connected in series via the first adapter 5. This one-to-one correspondence allows each first liquid cooling unit 11 and its corresponding second liquid cooling unit 21 to dissipate heat for a specific area of ​​the battery module 20. The one-to-one correspondence and series connection via the first adapter 5 reduces the complexity of the piping in the liquid cooling system 10. Compared to complex parallel or mixed connections, this design makes the piping layout clearer and simpler, reduces the difficulty of piping layout, reduces intersections and interference between pipes, and improves the efficiency and reliability of system integration. The use of the first adapter 5 makes the connection between the first liquid cooling units 11 and the second liquid cooling units 21 more compact, enabling efficient heat dissipation within a limited space. During installation, the one-to-one correspondence and series connection via the first adapter 5 design makes operation simpler. Installers can connect the first liquid cooling unit 11, the first adapter 5, and the corresponding second liquid cooling unit 21 in a predetermined sequence without the need for complex piping connections and adjustments. This not only improves installation efficiency but also reduces the risk of errors during installation.

[0056] In addition, since there are assembly tolerances in the assembly process of the second liquid cooling section 21, it is impossible to guarantee that all the nozzles of the second liquid cooling section 21 are on the same line. By setting multiple first liquid cooling sections 11 and multiple second liquid cooling sections 21 in a one-to-one correspondence, it is beneficial to connect each first liquid cooling section 11 with the corresponding second liquid cooling section 21.

[0057] Reference Figure 5 In some embodiments, the first adapter 5 includes a first connector 51 located in the first liquid cooling section 11 and a second connector 52 located in the second liquid cooling section 21, with the first connector 51 and the second connector 52 fitting together. This fitting design makes the connection process between the first connector 51 and the second connector 52 simple and direct. Installers only need to align and insert the first connector 51 and the second connector 52 to complete the connection between the first liquid cooling section 11 and the second liquid cooling section 21, eliminating the need for complex bolt tightening, welding, or other operations, greatly shortening installation time and improving installation efficiency.

[0058] It should be noted that, in other embodiments, the first connector 51 of the first liquid cooling section 11 and the second connector 52 of the second liquid cooling section 21 can also be locked by a snap-fit ​​or by a threaded structure. Specifically, this application does not limit this.

[0059] Continue to refer to Figure 5In some embodiments, the liquid cooling system 10 further includes a sealing ring 6, which is elastically connected between the first connector 51 and the second connector 52 to seal the gap between them. Thus, even with high machining precision, minor gaps are inevitable during the fitting process of the first connector 51 and the second connector 52. The sealing ring 6, with its elastic properties, can fit tightly against the gap between the connectors, effectively preventing heat exchange fluid leakage. During operation, the liquid cooling system 10 may experience minor deformation of the connectors due to temperature changes, pressure fluctuations, etc. The elasticity of the sealing ring 6 allows it to adapt to this deformation, maintaining tight contact with the first connector 51 and the second connector 52 at all times, thus maintaining good sealing performance.

[0060] Reference Figure 1 and Figure 2 In some embodiments, the plurality of first liquid cooling sections 11 include a first cooling section 11a, which is used for thermally conductive connection to the top of two adjacent battery modules 20. Thus, the first cooling section 11a is simultaneously thermally connected to the top of two adjacent battery modules 20, significantly increasing the contact area with the battery modules 20 compared to a design that only targets the top of a single battery module 20. The increased contact area means more heat transfer channels, enabling faster heat dissipation from the battery modules 20, thereby effectively improving heat dissipation efficiency. Since the first cooling section 11a can dissipate heat for two battery modules 20 simultaneously, the number and complexity of pipes in the liquid cooling system 10 are reduced. Previously, separate liquid cooling sections and connecting pipes were required for the tops of the two battery modules 20; now, only one first cooling section 11a and corresponding connecting pipes are needed to achieve the heat dissipation function, making the entire liquid cooling system 10 more concise, compact, and easier to install and lay out. This design reduces the number of liquid cooling sections and the amount of pipes used, directly reducing the material cost of the liquid cooling system 10. The first cooling section 11a dissipates heat for both battery modules 20 simultaneously, which helps to achieve uniform heat dissipation between the two battery modules 20. This avoids the problem of excessive temperature differences between the battery modules 20 caused by uneven heat dissipation, reduces performance differences between the battery modules 20, and improves the stability and consistency of the entire battery system.

[0061] Reference Figure 2 and Figure 4In some embodiments, the first cooling section 11a includes at least two harmonica tubes 111 and two current collectors 112. The at least two harmonica tubes 111 are spaced apart along a first direction and are used for thermally conductive connection to the top of two adjacent battery modules 20. The two current collectors 112 are located at both ends of the at least two harmonica tubes 111, and each current collector 112 is connected to the end of the at least two harmonica tubes 111. This arrangement of at least two harmonica tubes 111 and two current collectors 112 means there are more heat conduction channels, enabling faster heat transfer from the two adjacent battery modules 20 and improving heat dissipation efficiency. The current collectors 112 are connected to the ends of the harmonica tubes 111 and serve to collect and distribute the heat exchange fluid. After being evenly distributed in the current collectors 112, the heat exchange fluid enters each harmonica tube 111, undergoes sufficient heat exchange with the harmonica tubes 111, and then flows out through the current collectors 112 at the other end. This design makes the flow of heat exchange fluid in the harmonica tube 111 more orderly and efficient, enhancing the heat exchange effect and improving the overall performance of the heat dissipation system.

[0062] Reference Figure 1 and Figure 2 In some embodiments, the plurality of battery modules 20 includes two first battery modules 20a located at the edges, and the plurality of first liquid cooling sections 11 further includes two second cooling sections 11b. The second cooling sections 11b are used for thermally conductive connection to the top of the first battery modules 20a adjacent to their edges. Thus, the second cooling sections 11b are specifically designed for thermally conductive connection to the top of these edge battery modules 20 adjacent to their edges, enabling direct and efficient heat conduction away from the edge battery modules 20, preventing heat accumulation in the edge region, effectively reducing the temperature of the edge battery modules 20, and improving the heat dissipation uniformity of the entire battery system. The effective heat dissipation of the edge battery modules 20 by the second cooling sections 11b can reduce the temperature difference between the edge battery modules 20 and the intermediate battery modules 20, reduce the performance inconsistency of the battery modules 20 caused by temperature unevenness, and improve the stability and reliability of the entire battery system.

[0063] Reference Figure 1In some embodiments, the liquid cooling system 10 further includes a second connecting pipe 7, which includes multiple second connecting branch pipes and a second connecting main pipe connected to the multiple second connecting branch pipes. The multiple second connecting branch pipes are respectively connected to multiple second liquid cooling sections 21, and the second connecting main pipe is used to output the heat exchange fluid after heat exchange. Thus, the second connecting main pipe, as the main channel for heat exchange fluid output, can collect and output the heat exchange fluid after heat exchange in each of the second liquid cooling sections 21. This centralized collection method helps maintain the smooth circulation of the heat exchange fluid within the liquid cooling system 10, ensuring that the heat exchange fluid can be discharged from the liquid cooling section in a timely manner, preparing for subsequent cooling and reuse, thereby improving the heat dissipation efficiency of the entire liquid cooling system 10. The multiple second connecting branch pipes are respectively connected to the multiple second liquid cooling sections 21, allowing the heat exchange fluid to flow out evenly from each of the second liquid cooling sections 21.

[0064] It should be noted that the materials of the first connecting pipe 4 and the second connecting pipe 7 can be selected as needed. For example, in some embodiments, the materials of the first connecting pipe 4 and the second connecting pipe 7 may include at least one of aluminum, PP (polypropylene), PA, PA66 (polyamide 66), PVC (polyvinyl chloride), PE (polyethylene), and PVDF (polyvinylidene fluoride). Specifically, in the embodiments of this application, at least one of the first connecting pipe 4 and the second connecting pipe 7 is set as a nylon tube. This gives at least one of the first connecting pipe 4 and the second connecting pipe 7 high mechanical strength and toughness, enabling it to withstand greater pressure and impact. In addition, it also gives at least one of the first connecting pipe 4 and the second connecting pipe 7 good fatigue resistance, making it less prone to fatigue cracks and damage under long-term alternating loads. Specifically, this application does not limit the materials of the first connecting pipe 4 and the second connecting pipe 7.

[0065] Additionally, refer to Figure 2 and Figure 3 In some embodiments, each second connecting branch pipe can be connected to the second liquid cooling section 21 via a second adapter 9. This simplifies the connection operation between the second connecting branch pipe and the second liquid cooling section 21. Of course, in other embodiments, the connection method between each second connecting branch pipe and the second liquid cooling section 21 can be selected as needed, and this application does not limit it.

[0066] Reference Figure 7In some embodiments, the battery module 20 has two first side surfaces 202 arranged opposite to each other along a first direction. Two adjacent second liquid cooling sections 21 are used to exchange heat between the two first side surfaces 202 along the first direction. Thus, the battery module 20 generates a large amount of heat on its side surfaces during operation. The adjacent second liquid cooling sections 21 exchange heat with the two opposite first side surfaces 202 of the battery module 20, directly and efficiently absorbing heat from the side surfaces and increasing the heat exchange area 211 with the battery module 20. Compared to designs that only dissipate heat from the top or bottom of the battery module 20, this all-around heat dissipation method can remove heat more quickly, reduce the temperature of the battery module 20, and improve heat dissipation efficiency. The two second liquid cooling sections 21 acting simultaneously on both sides of the battery module 20 ensure uniform heat dissipation in the first direction. This avoids excessive temperature differences caused by insufficient local heat dissipation, reduces internal thermal stress in the battery module 20, and improves the performance and lifespan of the battery module 20.

[0067] Reference Figure 4 In some embodiments, the plurality of second liquid cooling sections 21 include a second main cooling section 21a positioned between the two battery modules 20. The second main cooling section 21a has two heat exchange surfaces 211 arranged opposite to each other along a first direction, which are used to exchange heat with the two battery modules 20 respectively. Thus, since the second main cooling section 21a can exchange heat with both battery modules 20 simultaneously, the uniformity of heat dissipation between the two battery modules 20 can be ensured. This avoids excessive temperature differences inside the battery modules 20 due to uneven heat dissipation, reduces thermal stress inside the battery modules 20, and improves the performance and stability of the battery modules 20. Positioning the second main cooling section 21a between the two battery modules 20 makes full use of the space between them without occupying additional space. This compact layout results in higher space utilization for the entire battery system, achieving more efficient heat dissipation within a limited space, providing more possibilities for the installation of other components, and facilitating the miniaturization and integration design of the battery system. Since the second main cooling section 21a serves both battery modules 20 simultaneously, the number and complexity of pipes in the liquid cooling system 10 can be reduced. Compared to setting up a separate liquid cooling section for each battery module 20, this design simplifies pipe connections, reduces the difficulty and cost of pipe installation, and also facilitates system maintenance and management.

[0068] It should be noted that the second main cooling section 21a is a stamped cold plate. Thus, the stamped cold plate is a lightweight cold plate structure. In the CTP (Cell-to-Pack) structure, the battery pack 100 is quite sensitive to weight; the lightweight stamped cold plate helps reduce the overall weight of the battery pack 100, increasing the vehicle's driving range. The stamped cold plate can be reinforced with internal fins to improve thermal efficiency. The fin structure increases the contact area between the cold plate and the heat exchange medium, promoting heat transfer and enabling the battery module 20 to dissipate heat more quickly. This ensures that the battery module 20 operates within a suitable temperature range, improving its performance and lifespan. The stamped cold plate is suitable for this CTP structure; it can directly contact the battery module 20 for heat dissipation, eliminating the need for additional space reserved for the module as in traditional structures.

[0069] In a CTP (Cell-to-Pack) structure, the cells are arranged more densely, requiring higher heat dissipation. The stamped cold plate has excellent heat dissipation performance, meeting the heat dissipation needs of the cells in the CTP structure and ensuring stable operation of the battery pack 100 under various operating conditions. Side cooling utilizes the stamped cold plate, placing it on the sides of the battery modules 20, which significantly increases the heat exchange surface area 211. This large-area cooling of the battery modules 20 reduces the temperature control time of the battery modules 20 by half. This installation method does not occupy the top or bottom space of the battery compartment, fully utilizing the side space inside the battery pack 100 and improving its space utilization rate. The stamped cold plate, installed on the side of the battery modules 20, will not interfere with or affect the structure of the expansion beam 40, ensuring that the expansion beam 40 can function normally and guaranteeing the structural strength and safety of the battery pack 100.

[0070] Reference Figure 7 In some embodiments, the liquid cooling system 10 further includes a third liquid cooling component 8, which is used to exchange heat with the bottom of the multiple battery modules 20. Since the bottom of the battery modules 20 also generates a significant amount of heat during operation, the third liquid cooling component 8, in combination with the heat dissipation methods for the top and sides of the battery modules 20, achieves all-around heat dissipation for the battery modules 20. This multi-directional heat dissipation can more effectively reduce the overall temperature of the battery modules 20, avoid localized overheating, and improve the uniformity and efficiency of heat dissipation. This design allows the liquid cooling system 10 and the multiple battery modules 20 to have a larger heat exchange surface area 211, which can reduce the temperature rise of the battery modules 20 during operation and improve the cycle life of the battery modules 20. Furthermore, since the bottom of the battery modules 20 is in direct contact with the third liquid cooling component 8, heat can be rapidly transferred from the battery modules 20 to the heat exchange fluid. Compared to indirect heat dissipation through air or other media, liquid cooling has a higher thermal conductivity, which can dissipate heat more quickly and reduce the accumulation of heat inside the battery module 20, thereby keeping the battery module 20 within a suitable operating temperature range.

[0071] In some embodiments, the third liquid cooling component 8 and the second liquid cooling component 2 are connected in parallel. This parallel connection allows the heat exchange fluid to simultaneously enter both the third and second liquid cooling components, enabling them to simultaneously dissipate heat from the bottom and sides of the battery module 20. This significantly increases the heat dissipation area and efficiency, allowing for faster removal of heat generated by the battery module 20 and reducing its temperature. The parallel connection also ensures that the third and second liquid cooling components are independent of each other. When one component fails, only that component needs repair or replacement, eliminating the need for extensive disassembly and repair of the entire liquid cooling system 10. This greatly reduces maintenance costs and time, improving the availability of the liquid cooling system 10.

[0072] Secondly, this application also provides a battery pack 100, including multiple battery modules 20 and the liquid cooling system 10 as described above. Figures 6 to 8 This is a schematic diagram illustrating the structure of an embodiment of the battery pack provided by this utility model. (Refer to...) Figures 6 to 8 The liquid cooling system 10 is used to exchange heat for multiple battery modules 20. The structure of the liquid cooling system 10 is as described above. Since the battery pack 100 adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0073] It should be noted that in some embodiments, the battery pack 100 adopts a CTP (Cell-to-Pack) design, which results in higher structural strength and lower cost. Of course, in other embodiments, the battery pack 100 adopts other designs; specifically, this application does not limit this.

[0074] Reference Figure 7In some embodiments, the battery pack 100 further includes a third liquid cooling component 8 and a housing 30. The third liquid cooling component 8 is thermally connected to the bottom of multiple battery modules 20, and the housing 30 houses the multiple battery modules 20 and the liquid cooling system 10. The third liquid cooling component 8 is integrated with the bottom of the housing 30. This integrated design eliminates the need for separate liquid cooling components within the battery pack 100. This highly integrated design allows for a more compact internal space layout within the battery pack 100, enabling the installation of more battery modules 20 within a limited space, thereby increasing the energy density of the battery pack 100. The integrated design ensures close contact between the third liquid cooling component 8 and the bottom of the housing 30, allowing for more direct heat exchange between the bottom of the battery modules 20 and the liquid cooling component when placed inside the housing 30. This reduces intermediate heat transfer steps, lowers thermal resistance, and improves heat exchange efficiency, enabling faster removal of heat generated by the battery modules 20 and maintaining them within a suitable operating temperature range. The third liquid cooling component 8 is integrated with the bottom of the housing 30 to form a single integrated structure. This integrated structure increases the overall strength and rigidity of the housing 30, enabling it to better withstand the weight of the battery module 20 and other components, as well as the vibrations and impacts generated during vehicle operation, thereby improving the safety and reliability of the battery pack 100.

[0075] Reference Figure 8In one embodiment, the battery pack 100 further includes an expansion beam 40, which is installed inside the housing 30 to divide the inner cavity of the housing 30 into a first compartment 301 and a second compartment 302. The expansion beam 40 is provided with a plurality of clearance openings 401 connecting the first compartment 301 and the second compartment 302. The first compartment 301 is for mounting a plurality of battery modules 20. The liquid cooling system 10 further includes a second connecting pipe 7, which is at least partially located in the second compartment 302. The second connecting pipe 7 is adapted to pass through the plurality of clearance openings 401 and connect to a plurality of second liquid cooling sections 21. Thus, the expansion beam 40 divides the inner cavity of the housing 30 into a first compartment 301 and a second compartment 302. The first compartment 301 is specifically used to install multiple battery modules 20, while the second compartment 302 provides independent space for the second connecting pipe 7 of the liquid cooling system 10. This clear functional zoning makes the internal structure of the battery pack 100 clearer, with different components in their proper places, avoiding mutual interference, improving space utilization, and facilitating the placement of more battery modules 20 in a limited space, thereby increasing the energy density of the battery pack 100. The second connecting pipe 7 is at least partially located in the second compartment 302 and is connected to multiple second liquid cooling sections 21 in the first compartment 301 through the clearance opening 401 on the expansion beam 40. This layout makes the routing of wiring harnesses and pipes more orderly, reducing crossings and tangles, lowering the risk of short circuits, leaks, and other faults caused by messy wiring harnesses and pipes, and also facilitating subsequent wiring organization and maintenance. The expansion beam 40 acts as a physical isolation, separating the battery modules 20 from components such as the second connecting pipe 7. When the battery pack 100 is subjected to external forces such as collisions or compression, the expansion beam 40 can absorb some of the energy, reducing the direct impact on the battery module 20, lowering the possibility of damage to the battery module 20, and improving the safety of the battery pack 100 under complex working conditions. The second connecting pipe 7 passes through multiple avoidance ports 401 and connects to multiple second liquid cooling sections 21. This design makes the connection of the liquid cooling system 10 more compact and reasonable. The avoidance ports 401 facilitate the connection between the second connecting pipe 7 and the second liquid cooling section 21, reducing the assembly difficulty.

[0076] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid cooling system, characterized in that, include: The first liquid cooling assembly includes a plurality of first liquid cooling sections, which are used to exchange heat on the top of a plurality of battery modules. Each first liquid cooling section is used to transport heat exchange fluid, and the plurality of first liquid cooling sections are arranged in parallel. The second liquid cooling assembly includes a plurality of second liquid cooling sections for heat exchange on the sides of the plurality of battery modules. Each second liquid cooling section is used to transport heat exchange fluid. Each second liquid cooling section is connected in series with at least one first liquid cooling section, and the transport direction of the heat exchange fluid in each second liquid cooling section is parallel to and opposite to the transport direction of the heat exchange fluid in the series-connected first liquid cooling sections.

2. The liquid cooling system according to claim 1, characterized in that, Multiple first liquid cooling units are arranged at intervals along a first direction, and a clearance gap is formed between two adjacent first liquid cooling units. The clearance gap is used to avoid the explosion-proof valve of the battery module.

3. The liquid cooling system according to claim 1, characterized in that, It also includes a first connecting pipeline, which includes a first connecting main pipe and a plurality of first connecting branch pipes connected to the first connecting main pipe. The first connecting main pipe is used to supply heat exchange fluid input, and the plurality of first connecting branch pipes are respectively connected to a plurality of first liquid cooling units.

4. The liquid cooling system according to claim 1, characterized in that, Multiple first liquid cooling units and multiple second liquid cooling units are provided in a one-to-one correspondence; The liquid cooling system also includes multiple first adapters, and each first liquid cooling unit and its corresponding second liquid cooling unit are connected in series through the first adapter.

5. The liquid cooling system according to claim 4, characterized in that, The first adapter includes a first connector located in the first liquid cooling section and a second connector located in the second liquid cooling section, and the first connector and the second connector are fitted together.

6. The liquid cooling system according to claim 5, characterized in that, It also includes a sealing ring, which is elastically connected between the first connector and the second connector to seal the gap between the first connector and the second connector.

7. The liquid cooling system according to any one of claims 1 to 6, characterized in that, The plurality of first liquid cooling sections include a first cooling section, which is used for top thermally conductive connection to two adjacent battery modules.

8. The liquid cooling system according to claim 7, characterized in that, The first cooling section includes: At least two harmonica tubes are arranged at intervals along the first direction, and at least two of the harmonica tubes are used for top thermal connection to two adjacent battery modules. Two current collectors are disposed at both ends of at least two of the harmonica tubes, and each current collector is connected to the end of at least two of the harmonica tubes.

9. The liquid cooling system according to claim 7, characterized in that, The plurality of battery modules include two first battery modules located at the edges; The plurality of first liquid cooling sections also include two second cooling sections, which are used for top thermally conductive connection to the adjacent edge of the first battery module.

10. The liquid cooling system according to any one of claims 1 to 6, characterized in that, It also includes a second connecting pipeline, which includes a plurality of second connecting branch pipes and a second connecting main pipe connected to the plurality of second connecting branch pipes. The plurality of second connecting branch pipes are respectively connected to a plurality of second liquid cooling sections, and the second connecting main pipe is used to output the heat exchange fluid after heat exchange.

11. The liquid cooling system according to any one of claims 1 to 6, characterized in that, The battery module has two first side surfaces that are arranged opposite to each other along a first direction. Along the first direction, two adjacent second liquid cooling sections are used to exchange heat with the two first side surfaces.

12. The liquid cooling system according to any one of claims 1 to 6, characterized in that, The plurality of second liquid cooling units include a second main cooling unit positioned between the two battery modules. The second main cooling unit has two heat exchange surfaces disposed opposite to each other along a first direction, the two heat exchange surfaces being used to exchange heat with the two battery modules respectively.

13. The liquid cooling system according to any one of claims 1 to 6, characterized in that, It also includes a third liquid cooling component for heat exchange at the bottom of the plurality of battery modules.

14. The liquid cooling system according to claim 13, characterized in that, The third liquid cooling component is connected in parallel with the second liquid cooling component.

15. A battery pack, characterized in that, include: Multiple battery modules; The liquid cooling system as described in any one of claims 1 to 14, wherein the liquid cooling system is used to exchange heat between the plurality of battery modules.

16. The battery pack according to claim 15, characterized in that, Also includes: A third liquid cooling component is thermally connected to the bottom of the plurality of battery modules; The housing provides a mounting space for the multiple battery modules and the liquid cooling system; The third liquid cooling component is integrated with the bottom of the housing.

17. The battery pack according to claim 16, characterized in that, It also includes an expansion beam, which is installed inside the housing to divide the inner cavity of the housing into a first compartment and a second compartment. The expansion beam is provided with multiple clearance openings connecting the first compartment and the second compartment. The first compartment is for installing multiple battery modules. The liquid cooling system further includes a second connecting pipe, which is at least partially located in the second compartment and is adapted to pass through the plurality of the clearance openings and connect to the plurality of the second liquid cooling units.

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