Battery liquid cooling system and battery pack

Abstract

A battery liquid cooling system and battery pack, wherein the system comprises a plurality of meandering tubes (400), all of which are arranged in a first direction (X) at intervals, and which extend along a second direction (Y), and which have a return flow path extending along the longitudinal direction of the meandering tube (400), and which have a liquid inlet end and a liquid discharge end at opposite ends of the return flow path, and which have the liquid inlet end and the liquid discharge end at the same end in the longitudinal direction of the meandering tube (400). The system comprises at least two liquid-cooled flow path modules, each consisting of multiple expansion pipes (600), wherein each pair of adjacent meandering pipes (400) is expanded and communicated with each other via two expansion pipes (600), one of the two expansion pipes (600) is a liquid inlet pipe (610) and the other is a liquid discharge pipe (620), the liquid inlet pipe (610) communicates with the liquid inlet end of the meandering pipe (400), and the liquid discharge pipe (620) communicates with the liquid discharge end of the meandering pipe (400), all of which are sequentially arranged in a first direction (X).

Description

Technical Field

[0006] ,

[0001] This application claims the priority of a Chinese patent application with the application number 202423293125.6, which was filed with the Chinese Patent Office on December 30, 2024, and all the contents of the above application are incorporated herein by reference.

[0002] This application relates to the technical field of battery packs, for example, to a battery liquid cooling system and a battery pack.

Background Art

[0003] Currently, the types of battery cells that are mainstream in the market include cylindrical battery cells, prismatic battery cells, pouch battery cells, etc. Among them, the large-sized cylindrical battery cells of the 46 series, which feature a higher energy density, better safety and stability, and lower cost, have been widely popularized and used in electric vehicles and are expected to be the future development trend of electric vehicle batteries.

[0004] For large-sized cylindrical battery packs, thermal management is mainly carried out by bringing a serpentine tube liquid cooling plate into contact with the side of the battery cells. This form can strengthen the structural strength of the whole pack, has high thermal management efficiency, and low pressure loss of the liquid cooling system. Therefore, for the high-temperature problem caused by ultra-fast charging, double-sided serpentine tube side liquid cooling is an inevitable trend for large-sized cylindrical battery liquid cooling.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Although the liquid cooling system with serpentine tubes in parallel has a small pressure loss, since the serpentine tube liquid cooling is restricted to a single flow path and the number of serpentine tubes is large, it is difficult to ensure the uniformity of the flow rate between each serpentine tube. As a result, in the battery pack, there are problems such as a large temperature difference between battery cells and difficulty in the layout design of the cooling plate, and ultimately, the cooling efficiency of thermal management cannot reach an ideal state.

Means for Solving the Problems

[0006] This invention provides a battery liquid cooling system and a battery pack that ensure uniformity of flow rate and low flow resistance in the battery liquid cooling system, and reduce the space occupied by the battery liquid cooling system in the battery pack.

[0007] As a first aspect, in the embodiment of the present application, a plurality of meandering tubes are provided, all of which are arranged in a first direction and spaced apart, the meandering tubes extend along a second direction perpendicular to the first direction, a return channel is provided within the meandering tubes that extends along the longitudinal direction of the meandering tubes, the liquid inlet end and the liquid discharge end of the meandering tubes are provided at opposite ends of the return channel, and the liquid inlet end and the liquid discharge end are located at the same end in the longitudinal direction of the meandering tubes. The present invention provides a battery liquid cooling system comprising at least two liquid cooling flow path modules, each comprising a plurality of expansion tubes, wherein each pair of adjacent meandering tubes is expanded and communicated with each other through two of the expansion tubes, one of the two expansion tubes is a liquid inlet tube and the other is a liquid discharge tube, the liquid inlet tube communicates with all of the liquid inlet ends of the meandering tubes, and the liquid discharge tube communicates with all of the liquid discharge ends of the meandering tubes, all of which are arranged sequentially in a first direction.

[0008] As a second aspect, the present invention provides a battery pack comprising a case, a plurality of cylindrical battery cells provided within the case, and the above-described battery liquid cooling system, wherein all of the cylindrical battery cells are arranged in an array, and a plurality of the cylindrical battery cells are provided between two adjacent meandering tubes, spaced apart along the second direction and equally spaced, and the meandering tubes abut against the outer circumferential surfaces of the cylindrical battery cells on both sides thereof, and the meandering tubes are configured as a meandering wave structure that conforms to the cylindrical surface of the cylindrical battery cells. [Effects of the Invention]

[0009] In this battery liquid cooling system, the entire system is divided into multiple liquid cooling flow path modules, and by distributing the coolant, the flow of the coolant in the battery liquid cooling system becomes smoother, improving heat dissipation performance. With this improvement, it becomes easier to adjust the flow rate distribution between each meandering pipe in combination with control of the inner diameter of the pipes at each point, ensuring uniformity of flow rate and low flow resistance in each meandering pipe, reducing the overall space occupied in the battery pack. By optimizing and improving the structure as described above, the space in the second direction of the battery liquid cooling system becomes more compact, contributing to a reduction in occupied space. At the same time, in addition to the structure in which multiple meandering pipes are arranged sequentially, by connecting adjacent meandering pipes via expansion pipes, an efficient liquid cooling flow path module is formed, effectively improving the cooling efficiency of the battery liquid cooling system. As a result, the heat dissipation effect in the first direction of the battery liquid cooling system is improved, and the reliability and stability of operation are also improved. Within this system, the design of the expansion tubes enables quick connection between meandering tubes, simplifies the assembly procedure, and improves overall performance. Furthermore, the design of the reverse flow path in the meandering tubes ensures that the coolant flows in and out from the same side of the meandering tube, allowing for a planned flow trajectory of the coolant within the module and improving heat exchange efficiency.

[0010] This battery pack employs a design that combines a case, cylindrical battery cells, and the aforementioned liquid cooling system. By utilizing a design that brings the meandering tube into contact with the outer surfaces of the cylindrical battery cells on both sides, double-sided liquid cooling of the cylindrical battery cells is achieved, allowing the coolant to directly contact the surface of the cylindrical battery cells. This improves heat exchange efficiency, ensures good heat conduction, and contributes to solving the high-temperature problem caused by ultra-rapid charging of cylindrical battery cells. Furthermore, because the array arrangement of the cylindrical battery cells conforms to the meandering wave structure of the meandering tube, the contact area between the coolant and the battery surface increases, contributing to the achievement of consistent temperature differences between the cylindrical battery cells. This gives the battery pack efficient heat dissipation performance, ensures temperature uniformity of all cylindrical battery cells within the battery pack, and simultaneously improves the energy density and overall compactness of the battery pack. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of the structure of a battery liquid cooling system and a cylindrical battery cell according to an embodiment of the present invention. [Figure 2] This is a magnified view of part A in Figure 1. [Figure 3] This is a top view of a battery liquid cooling system and a cylindrical battery cell according to an embodiment of the present application. [Figure 4] This is a schematic diagram of the structure of the meandering pipe, the first liquid supply end head, and the expansion pipe according to an embodiment of the present application. [Figure 5] This is a schematic diagram of the structure of the meandering pipe, the second liquid supply end head, and the expansion pipe according to an embodiment of the present application. [Figure 6] This is a schematic diagram of the structure of the meandering pipe, the first liquid discharge end head, and the expansion pipe according to an embodiment of the present application. [Figure 7] This is a cross-sectional view of a fluid collector according to an embodiment of the present application. [Figure 8] This is a schematic diagram of the structure of an expansion pipe according to an embodiment of the present invention. [Figure 9] This is a side view of an expansion tube according to an embodiment of the present application. [Figure 10] This is a cross-sectional view of an expansion tube according to an embodiment of the present application. [Figure 11] This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention. [Figure 12] This is a top view of a battery pack according to an embodiment of the present invention. [Explanation of symbols]

[0012] X...first direction, Y...second direction, 101...First liquid-cooled flow path module, 102...Second liquid-cooled flow path module, 200... Case, 201... Liquid inlet, 202... Liquid outlet, 300...cylindrical battery cells, 400 ··· Serpentine tube, 410 ··· Serpentine flat tube, 411 ··· Liquid inlet flow path, 412 ··· Liquid discharge flow path, 420 ··· Current collector, 421 ··· First groove, 422 ··· First hole, 423 ··· Second groove, 424 ··· Second hole, 425 ··· First space, 426 ··· Second space, 430 ··· Sealing material 510 ··· Liquid inlet passage, 511 ··· Liquid inlet end head, 512 ··· First liquid supply end head, 513 ··· Second liquid supply end head, 520 ··· Liquid discharge passage, 521 ··· Liquid discharge end head, 522 ··· First liquid discharge end head, 523 ··· Second liquid discharge end head 600 ··· Expansion tube, 601 ··· Outer shell, 602 ··· Inner shell, 610 ··· Liquid inlet tube, 620 ··· Liquid discharge tube

Embodiments for Carrying Out the Invention

[0013] As shown in FIGS. 1 to 10, in this embodiment, there are a plurality of serpentine tubes 400, all of the serpentine tubes 400 are arranged side by side in the first direction X with intervals, the serpentine tubes 400 extend along the second direction Y perpendicular to the first direction X, and in the serpentine tubes 400, a folded flow path extending along the longitudinal direction of the serpentine tubes 400 is provided. The liquid inlet end and the liquid discharge end of the serpentine tubes 400 are respectively provided at both ends of the folded flow path, and the liquid inlet end and the liquid discharge end are located at the same end in the longitudinal direction of the serpentine tubes 400. There are also a plurality of expansion tubes 600, and each adjacent two serpentine tubes 400 are expanded and communicated with each other through two expansion tubes 600. One of the two expansion tubes 600 is a liquid inlet tube 610, and the other is a liquid discharge tube 620. The liquid inlet tube 610 is communicated with all the liquid inlet ends of the serpentine tubes 400, and the liquid discharge tube 620 is communicated with all the liquid discharge ends of the serpentine tubes 400. A battery liquid cooling system is provided, which includes at least two liquid cooling flow path modules arranged in sequence in the first direction X.

[0014] In this embodiment, two liquid cooling flow path modules are provided, which are the first liquid cooling flow path module 101 and the second liquid cooling flow path module 102 respectively.

[0015] In this battery liquid cooling system, the overall system is divided into a plurality of liquid cooling flow path modules, and the coolant is shunted. By doing so, the flow of the coolant in the battery liquid cooling system becomes smoother, the heat dissipation performance is improved. With the above improvements, in combination with the control of the inner diameters of the pipelines at multiple locations, it becomes easier to adjust the flow rate distribution between the plurality of serpentine tubes 400. The uniformity of the flow rate and the low flow resistance of each serpentine tube 400 are ensured, and the overall space occupancy rate in the battery pack is reduced. By optimizing and improving the structure as described above, the space in the second direction Y of the battery liquid cooling system becomes compact, contributing to the reduction of the occupied space. At the same time, in addition to the structure in which the plurality of serpentine tubes 400 are arranged sequentially, by connecting the adjacent serpentine tubes 400 via the expansion tube 600, an efficient liquid cooling flow path module is formed, and the cooling efficiency of the battery liquid cooling system is effectively improved. Therefore, the heat dissipation effect in the first direction X of the battery liquid cooling system becomes better, and at the same time, the reliability and stability of the operation are improved. Among them, due to the design of the expansion tube 600, rapid connection between the serpentine tubes 400 is realized, the assembly procedure is simplified, and the overall performance is improved. Also, due to the design of the return flow path in the serpentine tube 400, the coolant flows in and out from the same side of the serpentine tube 400, and the flow trajectory of the coolant inside the module is carried out in a planned manner, improving the heat exchange efficiency.

[0016] In this embodiment, the expansion tube 600 has an inner layer shell 602 and an outer layer shell 601 covering and connecting to the outside of the inner layer shell 602, and the hardness of the inner layer shell 602 is smaller than the hardness of the outer layer shell 601.

[0017] The design utilizes an inner shell 602 and an outer shell 601 in the expansion tube 600. The inner shell 602 is less rigid than the outer shell 601 and is made of a flexible material, facilitating connection with the meandering tube 400. At the same time, it has a certain elasticity, allowing it to adapt to minute deformations in the battery liquid cooling system. The outer shell 601 is made of a rigid material, improving the durability and reliability of the expansion tube 600. This design results in the expansion tube 600 having the advantage of saving space and lower manufacturing costs, and making it easier to operate when connecting to the meandering tube 400, thereby improving connection efficiency and service life, and ensuring the robustness and airtightness of the connection.

[0018] In some embodiments, the end of the expansion tube 600 is provided with a bell mouth having an outer diameter of M, and the outer diameter of the central part of the expansion tube 600 is N, and 1.1N <M<1.4Nである。

[0019] The bell mouth design at the end of the expansion tube 600 makes the expansion tube 600 more stable and secure when connected, reducing the risk of coolant leakage. By limiting the outer diameter of the bell mouth and the outer diameter of the central part of the expansion tube 600, an optimized design for the structure of the expansion tube 600 is achieved, ensuring smooth flow of coolant at the connection point, improving the reliability of the operation of the liquid cooling flow path module, and avoiding excessive material waste.

[0020] In some embodiments, the size of N may be determined according to the flow rate of the battery liquid cooling system and the number of meandering tubes 400.

[0021] In this embodiment, the expansion tube 600 is integrally molded using a two-color injection molding process.

[0022] The expansion tube 600 is integrally molded using a two-color injection molding process. This process improves production efficiency and product quality, ensures product integrity and consistency, enhances the structural strength and durability of the expansion tube 600, simplifies the production process, reduces production costs, makes the production procedure simpler and more efficient, and improves the appearance quality and service life of the expansion tube 600.

[0023] In one embodiment of this example, the inner shell 602 is made of a flexible nylon material, and the outer shell 601 is made of a rigid nylon material. Exemplary examples of flexible nylon materials include thermoplastic elastomers (TPE) / thermoplastic polyurethane elastomers (TPU), while rigid nylon materials include polyhexamethylene adipamide (PA66), polylaurolactam (PA12), and polyphenylene sulfide (PPS).

[0024] The inner shell 602 of the expansion tube 600 is made of flexible nylon material, which enhances the flexibility and impact resistance of the expansion tube 600. As a result, the expansion tube 600 has good elasticity and adaptability, absorbing acceptance tolerances and stacking tolerances. The use of rigid nylon material enhances structural strength and durability, improving the hardness and wear resistance of the expansion tube 600, enhancing its durability and corrosion resistance, and ensuring the reliability of the expansion tube 600 during operation and assembly efficiency. With these improvements, the expansion tube 600 can adapt to the high demands and complex environments of the battery liquid cooling system and meet the diverse needs of the battery liquid cooling system.

[0025] In other embodiments of this example, the selection of the material for the inner shell 602 or the outer shell 601 may be determined by those skilled in the art according to the actual conditions of the process.

[0026] In this embodiment, the reverse channel is configured as a single reverse structure.

[0027] By configuring the reverse flow path as a single reverse structure, the reverse flow path is installed in a U-shaped circuit. This improvement allows the coolant to be distributed more uniformly as it flows through the meandering tube 400, improving the flow efficiency and cooling effect of the coolant within the meandering tube 400, enhancing heat exchange efficiency, strengthening the heat dissipation performance of the battery liquid cooling system, ensuring temperature uniformity throughout the battery liquid cooling system, saving space, reducing occupied space, simplifying the specific structure of the meandering tube 400, and lowering production costs.

[0028] In some embodiments, the meandering pipe 400 comprises a meandering flat pipe 410 and a fluid collector 420 and a sealing material 430 connected to both ends of the meandering flat pipe 410, respectively. The meandering flat pipe 410 is provided with a liquid inlet channel 411 and a liquid discharge channel 412 extending along its longitudinal direction. The sealing material 430 is provided with a relay groove communicating with the liquid inlet channel 411 and the liquid discharge channel 412. The fluid collector 420 is provided with a first space 425 communicating with the liquid inlet channel 411 and the liquid inlet pipe 610, and a second space 426 communicating with the liquid discharge channel 412 and the liquid discharge pipe 620.

[0029] The meandering pipe 400 employs a design of a meandering flat pipe 410, a fluid collector 420, and a sealant 430, enabling smooth flow and effective control of the coolant within the meandering pipe 400. This makes the liquid inflow channel 411 and liquid discharge channel 412 more rational, improving the overall structure and functionality of the meandering pipe 400. At the same time, the design of the first space 425 and the second space 426 in the fluid collector 420, and the intermediate groove in the sealant 430, makes the flow of the coolant within the meandering pipe 400 smoother, ensuring that the coolant can flow in and out of the meandering pipe 400 smoothly.

[0030] In some embodiments, the fluid collector 420 has a first groove 421 and a second groove 423 recessed into it, a first hole 422 is provided in the side wall of the first groove 421, the first groove 421 communicates with the first hole 422 and forms a first space 425, a part of the liquid inlet passage 411 enters into the first groove 421 and the liquid inlet pipe 610 is inserted into the first hole 422, a second hole 424 is provided in the side wall of the second groove 423, the second groove 423 communicates with the second hole 424 and forms a second space 426, a part of the liquid discharge passage 412 enters into the second groove 423 and the liquid discharge pipe 620 is inserted into the second hole 424.

[0031] The first groove 421 and the second groove 423 provided in the fluid collector 420, as well as the corresponding liquid inlet hole (first hole 422) and liquid outlet hole (second hole 424), facilitate the insertion of the liquid inlet pipe 610 and the liquid outlet pipe 620, resulting in smoother liquid inflow and discharge, improved fluidity of the battery liquid cooling system, and enhanced heat dissipation. These improvements also simplify the assembly procedure of the expansion pipe 600, improving connection stability and reliability. Simultaneously, the liquid inlet pipe 610 and the liquid outlet pipe 620 are connected to the fluid collector 420 via an insertion configuration, and communicate with each other through the liquid inlet channel 411 and the liquid outlet channel 412. This design simplifies the connection procedure, makes the inflow and outflow of the coolant more orderly and efficient, and enables effective diversion and merging of the coolant within the meandering pipe 400, improving the operational efficiency and reliability of the battery liquid cooling system.

[0032] The above improvements ensure the flow planning capability within the narrow space of the meandering pipe 400, guarantee the uniformity of flow distribution and pressure drop performance of the meandering pipe 400, enable sufficient utilization of the space occupied by the meandering pipe 400, and contribute to reducing the types of materials required for the manufacture of the meandering pipe 400.

[0033] In some embodiments, the battery liquid cooling system further comprises a liquid inlet passage 510 and a liquid outlet passage 520 provided on one side of all meandering tubes 400, a liquid inlet end head 511 provided at the first end of the liquid inlet passage 510, a first liquid supply end head 512 provided at the second end of the liquid inlet passage 510, and at least one second liquid supply end head 513 provided in the center of the liquid inlet passage 510, the total number of first liquid supply end heads 512 and second liquid supply end heads 513 being equal to the number of liquid cooling flow path modules, and each first liquid supply end head 512 and each second liquid supply end head 513 is associated with one liquid cooling flow path module, and each first liquid supply end head 512 and all second liquid supply end heads 513 are associated with one A first liquid discharge end head 522 is provided at the first end of the liquid discharge passage 520, a liquid discharge end head 521 is provided at the second end of the liquid discharge passage 520, and at least one second liquid discharge end head 523 is provided in the central part of the liquid discharge passage 520. The total number of first liquid discharge end heads 522 and second liquid discharge end heads 523 is the same as the number of liquid cooling flow path modules, and each first liquid discharge end head 522 and each second liquid discharge end head 523 corresponds to one liquid cooling flow path module. Each first liquid discharge end head 522 and all second liquid discharge end heads 523 are inserted into one liquid discharge passage 420 and communicate with the groove bottom of the corresponding second groove 423.

[0034] By integrating all liquid inflow passages 510 and liquid discharge passages 520 into one side of the liquid cooling flow channel module, the routing paths of the liquid inflow passages 510 and liquid discharge passages 520 are shortened, reducing the space occupied by the liquid cooling flow channel module. This contributes to the realization of an extremely simplified design for the piping in the battery liquid cooling system, lowering the production cost of the battery liquid cooling system and increasing space utilization.

[0035] By fitting the end heads of the liquid inlet pipe 610 and liquid discharge pipe 620, as well as the central liquid supply end head and liquid discharge end head, to the fluid collector 420, the management of the coolant becomes more centralized and orderly. The configuration of the liquid inlet end head 511 and liquid discharge end head 521 allows the coolant to enter and exit each liquid cooling channel module more uniformly, achieving efficient coolant transport and improving the cooling efficiency and heat dissipation effect of the battery liquid cooling system. At the same time, the second liquid supply end head 513 and second liquid discharge end head 523 located in the central part can be expanded and connected according to the number of liquid cooling channel modules, improving the flexibility of the battery liquid cooling system.

[0036] As shown in Figures 1 to 12, this embodiment provides a battery pack comprising a case 200, a plurality of cylindrical battery cells 300 provided within the case 200, and the above-described battery liquid cooling system, wherein all cylindrical battery cells 300 are arranged in an array, and a plurality of cylindrical battery cells 300 are provided between two adjacent meandering tubes 400, spaced apart along the second direction Y, and the meandering tubes 400 abut against the outer circumferential surfaces of the cylindrical battery cells 300 on both sides thereof, and the meandering tubes 400 are configured as a meandering wave-like structure that conforms to the cylindrical surface of the cylindrical battery cells 300.

[0037] This battery pack employs a design that combines a case 200, cylindrical battery cells 300, and the above-mentioned liquid cooling system. By utilizing a design in which the meandering tube 400 abuts the outer surfaces of the cylindrical battery cells 300 on both sides, double-sided liquid cooling of the cylindrical battery cells 300 is achieved, allowing the cooling liquid to directly contact the surface of the cylindrical battery cells 300. This improves heat exchange efficiency, ensures good heat conduction, and contributes to solving the high-temperature problem caused by ultra-rapid charging of the cylindrical battery cells 300. Furthermore, because the array arrangement of the cylindrical battery cells 300 conforms to the meandering wave structure of the meandering tube 400, the contact area between the cooling liquid and the battery surface increases, contributing to the achievement of consistent temperature differences among the cylindrical battery cells 300. This gives the battery pack efficient heat dissipation performance, ensures temperature uniformity of all cylindrical battery cells 300 within the battery pack, and simultaneously improves the energy density and overall compactness of the battery pack.

[0038] In some embodiments, the case 200 is provided with a liquid inlet 201 and a liquid outlet 202, with a liquid inlet end head 511 inserted and connected to the liquid inlet 201 and a liquid outlet end head 521 inserted and connected to the liquid outlet 202.

Claims

1. A plurality of meandering pipes (400), all of which are arranged in a first direction (X) and spaced apart, and which extend along a second direction (Y) perpendicular to the first direction (X), and which have a bent flow path extending along the longitudinal direction of the meandering pipe (400), and which have a liquid inlet end and a liquid discharge end at opposite ends of the bent flow path, and which have the liquid inlet end and the liquid discharge end at the same end in the longitudinal direction of the meandering pipe (400), and A plurality of expansion pipes (600), wherein each pair of adjacent meandering pipes (400) are expanded and connected to each other via two of the expansion pipes (600), one of the two expansion pipes (600) is a liquid inlet pipe (610) and the other is a liquid discharge pipe (620), the liquid inlet pipe (610) is connected to all of the liquid inlet ends of the meandering pipes (400), and the liquid discharge pipe (620) is connected to all of the liquid discharge ends of the meandering pipes (400), and the plurality of expansion pipes (600), It comprises at least two liquid-cooled flow path modules, each arranged sequentially in a first direction (X), Battery liquid cooling system.

2. The expansion tube (600) has an inner shell (602) and an outer shell (601) covering the outside of the inner shell (602), wherein the hardness of the inner shell (602) is less than the hardness of the outer shell (601). The battery liquid cooling system according to claim 1.

3. A bell mouth with an outer diameter of M is provided at the end of the expansion tube (600), and the outer diameter of the central part of the expansion tube (600) is N, where 1.1N < M < 1.4N. The battery liquid cooling system according to claim 2.

4. The expansion tube (600) is integrally molded using a two-color injection molding process. The battery liquid cooling system according to claim 2.

5. The material of the inner shell (602) is a flexible nylon material, The material of the outer shell (601) is a hard nylon material, Including at least one of the following, The battery liquid cooling system according to claim 2.

6. The aforementioned reverse channel is configured as a single reverse structure. The battery liquid cooling system according to claim 1.

7. The meandering pipe (400) comprises a meandering flat pipe (410), a fluid collector (420) and a sealing material (430) connected to both ends of the meandering flat pipe (410), respectively. Inside the meandering flat pipe (410), there is a liquid inflow channel (411) and a liquid discharge channel (412) extending along the longitudinal direction. The interior of the sealing material (430) is in communication with the liquid inflow channel (411) and the liquid discharge channel (412). The fluid collector (420) is provided with a first space (425) in communication with the liquid inflow channel (411) and the liquid inflow pipe (610), and a second space (426) in communication with the liquid discharge channel (412) and the liquid discharge pipe (620). The battery liquid cooling system according to claim 6.

8. The fluid collection channel (420) has a first groove (421) and a second groove (423) recessed into it, a first hole (422) is provided in the side wall of the first groove (421), the first groove (421) communicates with the first hole (422) and forms the first space (425), a part of the liquid inflow channel (411) enters into the first groove (421), the liquid inflow pipe (610) is inserted into the first hole (422), a second hole (424) is provided in the side wall of the second groove (423), the second groove (423) communicates with the second hole (424) and forms the second space (426), a part of the liquid discharge channel (412) enters into the second groove (423), and the liquid discharge pipe (620) is inserted into the second hole (424). The battery liquid cooling system according to claim 7.

9. The system further comprises a liquid inlet passage (510) and a liquid discharge passage (520) provided on one side of each of the meandering pipes (400), a liquid inlet end head (511) provided at the first end of the liquid inlet passage (510), a first liquid supply end head (512) provided at the second end of the liquid inlet passage (510), at least one second liquid supply end head (513) provided in the central part of the liquid inlet passage (510), the total number of the first liquid supply end heads (512) and the second liquid supply end heads (513) being the same as the number of liquid cooling flow path modules, and each of the first liquid supply end heads (512) and each of the second liquid supply end heads (513) being associated with one of the liquid cooling flow path modules, and each of the first liquid supply end heads (512) and all of the second liquid supply end heads (513) being inserted into one of the fluid collectors (420) The liquid discharge passage (520) is provided with a first liquid discharge end head (522) at its first end, a second liquid discharge end head (521) at its second end, and at least one second liquid discharge end head (523) in the central part of the liquid discharge passage (520). The total number of the first liquid discharge end heads (522) and the second liquid discharge end heads (523) is the same as the number of the liquid cooling flow path modules. Each of the first liquid discharge end heads (522) and each of the second liquid discharge end heads (523) is associated with one of the liquid cooling flow path modules. Each of the first liquid discharge end heads (522) and all of the second liquid discharge end heads (523) is inserted into one of the fluid collectors (420) and communicates with the groove bottom of the corresponding second groove (423). The battery liquid cooling system according to claim 8.

10. The system comprises a case (200), a plurality of cylindrical battery cells (300) provided within the case (200), and a battery liquid cooling system according to any one of claims 1 to 9, wherein all of the cylindrical battery cells (300) are arranged in an array, and a plurality of the cylindrical battery cells (300) are provided between two adjacent meandering tubes (400) at equal intervals along the second direction (Y), the meandering tubes (400) abut against the outer circumferential surfaces of the cylindrical battery cells (300) on both sides of the meandering tubes (400), and the meandering tubes (400) are configured as a meandering wave structure that conforms to the cylindrical surface of the cylindrical battery cells (300). Battery pack.

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