Battery liquid cooling system and battery pack

Abstract

The utility model relates to the technical field of battery packs, and particularly discloses a battery liquid cooling system and a battery pack. The system comprises at least two liquid cooling flow path modules, all the liquid cooling flow path modules are sequentially arranged in the first direction, and each liquid cooling flow path module comprises a plurality of coiled pipes and a plurality of expansion connection pipes; all the coiled pipes are arranged side by side at intervals in the first direction, the coiled pipes extend in the second direction, turn-back flow channels extending in the length direction of the coiled pipes are arranged in the coiled pipes, and the liquid inlet ends and the liquid outlet ends of the coiled pipes are arranged at the two ends of the turn-back flow channels correspondingly and located at the same ends of the coiled pipes in the length direction; every two adjacent coiled pipes are in expanded connection and communication through two expanded connection pipes, one of the two expanded connection pipes is a liquid inlet pipe, the other expanded connection pipe is a liquid outlet pipe, the liquid inlet pipe is communicated with the upper liquid inlet end of the coiled pipe, and the liquid outlet pipe is communicated with the upper liquid outlet end of the coiled pipe. According to the system, through structural improvement, flow uniformity and low flow resistance are guaranteed, and the space proportion of the whole system in a battery pack is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially battery liquid cooling system and battery pack. BACKGROUND

[0002] At present, the mainstream battery cell types on the market include cylindrical battery cells, square battery cells and soft package battery cells etc. Among them, 46 series large cylindrical battery cells have higher energy density, better safety stability and lower cost, have been widely used in electric vehicles, and are expected to become the future development trend of electric vehicle batteries.

[0003] The large cylindrical battery pack mainly applies the mode that the serpentine tube liquid cooling plate contacts with the side surface of the battery cell to carry out thermal management, can enhance the structural strength of the whole pack, has high thermal management efficiency and small liquid cooling system pressure drop, therefore, for the high temperature problem caused by super fast charging, the double-sided serpentine tube side liquid cooling is the inevitable trend of the large cylindrical battery liquid cooling. However, the serpentine tube parallel liquid cooling system has small pressure drop, and due to the limitation of single flow channel and large quantity of the serpentine tube, it is difficult to ensure the flow uniformity between each serpentine tube, thereby causing the problems of large battery cell temperature difference in the battery pack and difficult cooling plate arrangement design, so that the cooling efficiency of the thermal management cannot reach the ideal state.

[0004] Therefore, in view of the above problems, there is an urgent need for a battery liquid cooling system suitable for super fast charging. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing battery liquid cooling system and battery pack to ensure the flow uniformity and low flow resistance of the battery liquid cooling system and reduce the space proportion in the battery pack.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The battery liquid cooling system comprises at least two liquid cooling flow path modules, all the liquid cooling flow path modules are arranged in sequence in a first direction, the liquid cooling flow path module comprises a plurality of serpentine tubes and a plurality of expansion pipes, all the serpentine tubes are arranged in parallel and spaced apart in the first direction, the serpentine tube extends along a second direction, the serpentine tube is provided with a return flow channel extending along the length direction of the serpentine tube, the liquid inlet end and the liquid outlet end of the serpentine tube are respectively arranged at both ends of the return flow channel, and the liquid inlet end and the liquid outlet end are located at the same end in the length direction of the serpentine tube, wherein the second direction is perpendicular to the first direction, each two adjacent serpentine tubes are connected and communicated through two expansion pipes, one of the two expansion pipes is a liquid inlet pipe, and the other is a liquid outlet pipe, the liquid inlet pipe is connected and communicated with all the liquid inlet ends on the serpentine tube, and the liquid outlet pipe is connected and communicated with all the liquid outlet ends on the serpentine tube.

[0008] As an optional technical scheme of the battery liquid cooling system, the expansion pipe has an inner shell and an outer shell sleeved outside the inner shell, and the hardness of the inner shell is less than that of the outer shell.

[0009] As an optional technical scheme of the battery liquid cooling system, the end of the expansion pipe is provided with a flared mouth, the outer diameter of the flared mouth is M, the outer diameter of the middle part of the expansion pipe is N, and 1.1N

[0010] As an optional technical scheme of the battery liquid cooling system, the expansion pipe is integrally formed by a double-color injection molding process.

[0011] As an optional technical scheme of the battery liquid cooling system, the material of the inner shell is a flexible nylon material, and / or the material of the outer shell is a hard nylon material.

[0012] As an optional technical scheme of the battery liquid cooling system, the return flow channel is arranged in a single-turn return structure.

[0013] As an optional technical scheme of the battery liquid cooling system, the serpentine pipe includes a serpentine flat pipe, a collector and a blocking piece connected to both ends of the serpentine flat pipe, the serpentine flat pipe is provided with an inlet flow channel and an outlet flow channel extending in the length direction, the blocking piece is provided with a transfer groove, the transfer groove communicates the inlet flow channel and the outlet flow channel, the collector is provided with a first space and a second space, the first space communicates the inlet flow channel and the inlet pipe, and the second space communicates the outlet flow channel and the outlet pipe.

[0014] As an optional technical scheme of the battery liquid cooling system, the collector is concavely provided with a first groove and a second groove, a first hole is formed in the side wall of the first groove, the first groove communicates the first hole and forms the first space, the inlet flow channel partially extends into the first groove, the inlet pipe is inserted into the first hole, a second hole is formed in the side wall of the second groove, the second groove communicates the second hole and forms the second space, the outlet flow channel partially extends into the second groove, and the outlet pipe is inserted into the second hole.

[0015] As an optional technical solution of the battery liquid cooling system, the battery liquid cooling system further comprises an inlet channel and an outlet channel arranged on one side of all the serpentine pipes, one end of the inlet channel is provided with an inlet end, the other end is provided with a first liquid supply end, the middle part of the inlet channel is provided with at least one second liquid supply end, the sum of the number of the first liquid supply end and the second liquid supply end is the same as the number of the liquid cooling flow path module, and the first liquid supply end and each second liquid supply end correspond to one liquid cooling flow path module, the first liquid supply end and all the second liquid supply ends are respectively inserted into one current collector and communicate with the bottom of the corresponding first groove; one end of the outlet channel is provided with an outlet end, the other end is provided with a first liquid discharge end, the middle part of the outlet channel is provided with at least one second liquid discharge end, the sum of the number of the first liquid discharge end and the second liquid discharge end is the same as the number of the liquid cooling flow path module, and the first liquid discharge end and each second liquid discharge end correspond to one liquid cooling flow path module, the first liquid discharge end and all the second liquid discharge ends are respectively inserted into one current collector and communicate with the bottom of the corresponding second groove.

[0016] The battery pack comprises a box body and a plurality of cylindrical battery cells and the battery liquid cooling system arranged in the box body, all the cylindrical battery cells are arranged in an array, a plurality of cylindrical battery cells are arranged between adjacent serpentine pipes in the second direction, the serpentine pipe abuts against the outer circumferential surface of the cylindrical battery cells on both sides, and the serpentine pipe is arranged in a serpentine wave structure matched with the cylindrical surface of the cylindrical battery cells.

[0017] The battery liquid cooling system has the following beneficial effects:

[0018] The battery liquid cooling system adopts the mode of dividing the whole into a plurality of liquid cooling flow path modules, achieves the purpose of shunting the cooling liquid, makes the flow of the cooling liquid in the battery liquid cooling system more smooth, improves the heat dissipation performance, the above improvement is convenient for controlling the inner diameters of the pipelines at all places to adjust the flow distribution between the serpentine pipes, so as to ensure the flow uniformity and low flow resistance of each serpentine pipe, reduce the space ratio of the whole in the battery pack, through the above optimization and improvement of the structure, the battery liquid cooling system is compact in the second direction, which helps to reduce the occupied space.

[0019] The battery pack adopts a combination design of a box body, cylindrical cells and the battery liquid cooling system, utilizes the design that the serpentine pipe abuts against the outer circumferential surfaces of the cylindrical cells on two sides to realize double-face liquid cooling of the cylindrical cells, so that the cooling liquid can directly contact the surfaces of the cylindrical cells, the heat exchange efficiency is improved, the good heat conduction effect is ensured, and the high-temperature problem caused by super-fast charging of the cylindrical cells is solved. The array arrangement of the cylindrical cells is matched with the serpentine wave structure of the serpentine pipe, the contact area of the cooling liquid and the surfaces of the battery is increased, the consistency of the temperature difference between the cylindrical cells is helped to be realized, the battery pack has high heat dissipation performance, the temperature uniformity of all the cylindrical cells in the battery pack is ensured, and the energy density and the overall structural compactness of the battery pack are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic view of a battery liquid cooling system and a cylindrical cell provided by an embodiment of the present utility model;

[0021] Figure 2 is Figure 1 is a partial enlarged view of A in figure 1;

[0022] Figure 3 is a top view of a battery liquid cooling system and a cylindrical cell provided by an embodiment of the present utility model;

[0023] Figure 4 is a structure schematic view of a serpentine pipe, a first liquid supply end and an expansion joint pipe provided by an embodiment of the present utility model;

[0024] Figure 5 is a structure schematic view of a serpentine pipe, a second liquid supply end and an expansion joint pipe provided by an embodiment of the present utility model;

[0025] Figure 6 is a structure schematic view of a serpentine pipe, a first liquid discharge end and an expansion joint pipe provided by an embodiment of the present utility model;

[0026] Figure 7 is a sectional view of a current collector provided by an embodiment of the present utility model;

[0027] Figure 8 is a structure schematic view of an expansion joint pipe provided by an embodiment of the present utility model;

[0028] Figure 9 is a side view of an expansion joint pipe provided by an embodiment of the present utility model;

[0029] Figure 10 is a sectional view of an expansion joint pipe provided by an embodiment of the present utility model;

[0030] Figure 11 is a structure schematic view of a battery pack provided by an embodiment of the present utility model;

[0031] Figure 12 is a top view of the battery pack provided by the embodiment of the utility model.

[0032] In the figure:

[0033] X, first direction; Y, second direction;

[0034] 101, first liquid cooling flow path module; 102, second liquid cooling flow path module;

[0035] 200, box body; 201, liquid inlet; 202, liquid outlet;

[0036] 300, cylindrical cell;

[0037] 400, serpentine pipe; 410, serpentine flat pipe; 420, current collector; 421, first groove; 422, first hole; 423, second groove; 424, second hole; 430, plugging piece;

[0038] 510, liquid inlet channel; 511, liquid inlet end; 512, first liquid supply end; 513, second liquid supply end; 520, liquid outlet channel; 521, liquid outlet end; 522, first liquid discharge end; 523, second liquid discharge end;

[0039] 600, expansion tube; 601, outer shell; 602, inner shell. DETAILED DESCRIPTION

[0040] The technical solutions of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0041] In the description of the utility model, it is necessary to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and, the first feature is "above", "above" and "above" the second feature, including the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "below" and "below" the second feature, including the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the utility model, it is necessary to explain, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0043] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as a limitation on the utility model.

[0044] As Figures 1 to 10As shown, the battery liquid cooling system provided in the embodiment includes at least two liquid cooling flow path modules, all the liquid cooling flow path modules are arranged in sequence in the first direction X, the liquid cooling flow path module includes a plurality of serpentine pipes 400 and a plurality of expansion pipes 600; all the serpentine pipes 400 are arranged side by side and spaced apart in the first direction X, the serpentine pipe 400 extends along the second direction Y, the serpentine pipe 400 is provided with a return flow channel extending along the length direction of the serpentine pipe 400, the liquid inlet end and the liquid outlet end of the serpentine pipe 400 are respectively arranged at two ends of the return flow channel, and the liquid inlet end and the liquid outlet end are located at the same end in the length direction of the serpentine pipe 400, wherein the second direction Y is perpendicular to the first direction X; each two adjacent serpentine pipes 400 are connected and communicated through two expansion pipes 600, one of the two expansion pipes 600 is a liquid inlet pipe, and the other is a liquid outlet pipe, the liquid inlet pipe is connected and communicated with all the liquid inlet ends of the serpentine pipes 400, and the liquid outlet pipe is connected and communicated with all the liquid outlet ends of the serpentine pipes 400.

[0045] In the embodiment, two liquid cooling flow path modules are provided, which are a first liquid cooling flow path module 101 and a second liquid cooling flow path module 102.

[0046] The battery liquid cooling system adopts the mode of dividing the whole into a plurality of liquid cooling flow path modules to achieve the purpose of shunting the cooling liquid, so that the flow of the cooling liquid in the battery liquid cooling system is more smooth, the heat dissipation performance is improved, and the above improvement is convenient for combining the control of the inner diameters of the pipelines at each place to adjust the flow distribution between each serpentine pipe 400 to ensure the flow uniformity and low flow resistance of each serpentine pipe 400, reduce the space ratio of the whole in the battery pack, and through the above optimization and improvement of the structure, the battery liquid cooling system is compact in space in the second direction Y, which helps to reduce the occupied space. At the same time, with the structure of the plurality of serpentine pipes 400 arranged in sequence and the expansion pipe 600 connecting the adjacent serpentine pipes 400, a high-efficiency liquid cooling flow path module is formed, the cooling efficiency of the battery liquid cooling system is effectively improved, so that the battery liquid cooling system has better heat dissipation effect in the first direction X, and the operation reliability and stability are improved. The design of the expansion pipe 600 realizes the quick connection between the serpentine pipes 400, simplifies the assembly process, and improves the overall performance; and the design of the return flow channel on the serpentine pipe 400 makes the cooling liquid enter and exit on the same side of the serpentine pipe 400, plans the flow track of the cooling liquid inside the module, and improves the heat exchange efficiency.

[0047] In the embodiment, the expansion pipe 600 has an inner shell 602 and an outer shell 601 sleeved outside the inner shell 602, and the hardness of the inner shell 602 is less than that of the outer shell 601.

[0048] The design of the expansion pipe 600 adopts the inner shell 602 and the outer shell 601, and the hardness of the inner shell 602 is less than that of the outer shell 601. The inner shell 602 is made of flexible material, which is convenient for connecting with the serpentine pipe 400 and has a certain elasticity, which can adapt to the slight deformation in the battery liquid cooling system. The outer shell 601 is made of hard material, which improves the durability and reliability of the expansion pipe 600. The above design makes the expansion pipe 600 have the advantages of saving space and low manufacturing cost, and is more easy to operate when connecting the serpentine pipe 400, thereby improving the connection efficiency and service life, and ensuring the firmness and sealing of the connection.

[0049] Further, the end of the expansion pipe 600 is provided with a flared mouth, the outer diameter of the flared mouth is M, and the outer diameter of the middle part of the expansion pipe 600 is N, 1.1N

[0050] The design of the flared mouth at the end of the expansion pipe 600 makes the expansion pipe 600 more stable and reliable when connecting, which can reduce the risk of cooling liquid leakage. By limiting the size of the outer diameter of the flared mouth and the outer diameter of the middle part of the expansion pipe 600, the optimization design of the structure of the expansion pipe 600 is realized, which ensures the smooth flow of the cooling liquid at the connection, improves the reliability of the operation of the liquid cooling flow path module, and avoids the waste of too much material.

[0051] Specifically, the size of N is determined according to the flow size of the battery liquid cooling system and the number of serpentine pipes 400. The specific determination method is well known in the art and is well known to those skilled in the art, which will not be described here.

[0052] In this embodiment, the expansion pipe 600 is integrally formed by two-color injection molding process.

[0053] The expansion pipe 600 is integrally formed by two-color injection molding process, which improves the production efficiency and product quality, guarantees the integrity and consistency of the product, enhances the structural strength and durability of the expansion pipe 600, and simplifies the production process, reduces the production cost, makes the production process more simple and efficient, and improves the appearance quality and service life of the expansion pipe 600.

[0054] In one embodiment of the present embodiment, the material of the inner shell 602 is flexible nylon material; the material of the outer shell 601 is hard nylon material. Specifically, the flexible nylon material includes TPE / TPU and other materials; the hard nylon material includes PA66, PA12 and PPS and other materials.

[0055] The inner shell 602 of the expansion pipe 600 uses a flexible nylon material, which enhances the flexibility and impact resistance of the expansion pipe 600, so that the expansion pipe 600 has good elasticity and adaptability, and plays a role in absorbing incoming and stacking tolerances; the setting of the hard nylon material plays a role in improving the structural strength and durability, improves the hardness and wear resistance of the expansion pipe 600, improves the durability and corrosion resistance of the expansion pipe 600, and can ensure the reliability and assembly efficiency of the expansion pipe 600 during work. The above improvements make the expansion pipe 600 adapt to the high requirements and complex environment of the battery liquid cooling system, and can meet the different needs of the battery liquid cooling system.

[0056] In other embodiments of the present embodiment, only the material of the inner shell 602 or the material of the outer shell 601 is limited. The specific material selection is determined by a person skilled in the art according to engineering practice, and the determination method is a conventional technical means in the art, which will not be described here.

[0057] In the present embodiment, the return flow channel is provided in a single return structure.

[0058] The limitation of the return flow channel provided in a single return structure makes the return flow channel arranged in a U-shaped loop. The above improvement makes the cooling liquid flow more uniformly in the serpentine pipe 400, improves the flow efficiency and cooling effect of the cooling liquid in the serpentine pipe 400, improves the heat exchange efficiency, enhances the heat dissipation performance of the battery liquid cooling system, ensures the temperature uniformity of the whole battery liquid cooling system, saves space, reduces the occupied space, simplifies the specific structure of the serpentine pipe 400, and reduces the production cost.

[0059] Further, the serpentine pipe 400 includes a serpentine flat pipe 410, a current collector 420 and a blocking piece 430 connected to both ends of the serpentine flat pipe 410, respectively, the serpentine flat pipe 410 is provided with a liquid inlet flow channel and a liquid outlet flow channel extending in the length direction, the blocking piece 430 is provided with a transfer groove, the transfer groove communicates the liquid inlet flow channel and the liquid outlet flow channel, the current collector 420 is provided with a first space and a second space, the first space communicates the liquid inlet flow channel and the liquid inlet pipe, and the second space communicates the liquid outlet flow channel and the liquid outlet pipe.

[0060] The serpentine pipe 400 adopts the design of the serpentine flat pipe 410, the current collector 420 and the blocking piece 430, which realizes the smooth flow and effective management of the cooling liquid in the serpentine pipe 400. The liquid inlet flow channel and the liquid outlet flow channel are more reasonable, which improves the overall structure and functionality of the serpentine pipe 400. At the same time, the design of the first space and the second space on the current collector 420 and the transfer groove on the blocking piece 430 makes the cooling liquid flow more smoothly in the serpentine pipe 400, which ensures that the cooling liquid can smoothly enter and exit the serpentine pipe 400.

[0061] Further, the current collector 420 is concavely provided with a first groove 421 and a second groove 423, a side wall of the first groove 421 is provided with a first hole 422, the first groove 421 is communicated with the first hole 422 and forms a first space, the liquid inlet channel part extends into the first groove 421, the liquid inlet pipe is inserted into the first hole 422, a side wall of the second groove 423 is provided with a second hole 424, the second groove 423 is communicated with the second hole 424 and forms a second space, the liquid outlet channel part extends into the second groove 423, and the liquid outlet pipe is inserted into the second hole 424.

[0062] The first groove 421 and the second groove 423 provided on the current collector 420 and the corresponding liquid inlet hole and liquid outlet hole enable the liquid inlet pipe and the liquid outlet pipe to be conveniently inserted, so that the liquid inlet and the liquid outlet are smoother, the flow of the battery liquid cooling system is improved, and the heat dissipation effect is enhanced. The above improvement also simplifies the assembly process of the expanded pipe 600 and improves the stability and reliability of the connection. Meanwhile, the liquid inlet pipe and the liquid outlet pipe are connected to the current collector 420 in a plug-in manner and are communicated with the liquid inlet pipe and the liquid outlet pipe through the liquid inlet channel and the liquid outlet channel. The above design simplifies the connection process, makes the inlet and outlet of the cooling liquid more orderly and efficient, realizes effective distribution and convergence of the cooling liquid in the serpentine pipe 400, improves the operation efficiency of the battery liquid cooling system, and improves the operation reliability.

[0063] The above improvement ensures the ability of the serpentine pipe 400 to plan the flow in a narrow space, ensures the uniformity of the flow distribution and the pressure drop performance of the serpentine pipe 400, realizes full use of the space occupied by the serpentine pipe 400, and helps to reduce the types of materials required for manufacturing the serpentine pipe 400.

[0064] Further, the battery liquid cooling system further comprises a liquid inlet passage 510 and a liquid outlet passage 520 arranged on one side of all the serpentine pipes 400, one end of the liquid inlet passage 510 is provided with a liquid inlet end 511, the other end is provided with a first liquid supply end 512, the middle part of the liquid inlet passage 510 is provided with at least one second liquid supply end 513, the sum of the number of the first liquid supply end 512 and the second liquid supply end 513 is the same as the number of the liquid cooling flow path module, and the first liquid supply end 512 and each second liquid supply end 513 correspond to one liquid cooling flow path module, and the first liquid supply end 512 and all the second liquid supply ends 513 are respectively inserted into one current collector 420 and communicated with the groove bottom of the corresponding first groove 421; one end of the liquid outlet passage 520 is provided with a liquid outlet end 521, the other end is provided with a first liquid discharge end 522, the middle part of the liquid outlet passage 520 is provided with at least one second liquid discharge end 523, the sum of the number of the first liquid discharge end 522 and the second liquid discharge end 523 is the same as the number of the liquid cooling flow path module, and the first liquid discharge end 522 and each second liquid discharge end 523 correspond to one liquid cooling flow path module, and the first liquid discharge end 522 and all the second liquid discharge ends 523 are respectively inserted into one current collector 420 and communicated with the groove bottom of the corresponding second groove 423.

[0065] By integrating all the liquid inlet channels 510 and liquid outlet channels 520 on one side of the liquid cooling flow path module, the layout trajectory of the liquid inlet channels 510 and liquid outlet channels 520 is shortened, the space occupied by the liquid cooling flow path module is reduced, which helps to achieve a simplified design of the pipeline in the battery liquid cooling system, reduces the production cost of the battery liquid cooling system, and improves the space utilization rate.

[0066] The coordination between the inlet and outlet pipes, the central supply and drain pipes, and the collector 420 allows for more centralized and orderly management of the coolant. The inlet and outlet pipes 511 and 521 ensure that the coolant enters and exits each liquid-cooled flow path module more evenly, achieving efficient coolant transfer and improving the cooling efficiency and heat dissipation of the battery liquid-cooling system. Furthermore, the second supply pipe 513 and the second drain pipe 523 in the central location can be expanded to accommodate different numbers of liquid-cooled flow path modules, enhancing the flexibility of the battery liquid-cooling system.

[0067] like Figures 1 to 12 As shown, this embodiment also provides a battery pack, including a housing 200 and a plurality of cylindrical cells 300 disposed within the housing 200 and the aforementioned battery liquid cooling system. All the cylindrical cells 300 are arranged in an array, and a plurality of cylindrical cells 300 are evenly distributed along the second direction Y between two adjacent serpentine tubes 400. The serpentine tubes 400 abut against the outer peripheral surfaces of the cylindrical cells 300 on both sides of them, and the serpentine tubes 400 are configured as serpentine corrugated structures adapted to the cylindrical surfaces of the cylindrical cells 300.

[0068] This battery pack employs a combined design of a housing 200, cylindrical cells 300, and the aforementioned liquid cooling system. The design utilizes a serpentine tube 400 that contacts the outer surfaces of the cylindrical cells 300 on both sides to achieve double-sided liquid cooling of the cells 300. This allows the coolant to directly contact the surface of the cylindrical cells 300, improving heat exchange efficiency and ensuring good heat conduction. This helps address the high-temperature issues associated with super-fast charging of the cylindrical cells 300. Furthermore, the array arrangement of the cylindrical cells 300 is compatible with the serpentine corrugated structure of the serpentine tube 400, increasing the contact area between the coolant and the battery surface. This helps achieve uniform temperature differences between the cylindrical cells 300, resulting in highly efficient heat dissipation performance. It ensures temperature uniformity among all cylindrical cells 300 within the battery pack, while also improving the energy density and overall structural compactness of the battery pack.

[0069] Specifically, the housing 200 is provided with an inlet 201 and an outlet 202, with the inlet end 511 connected to the inlet 201 and the outlet end 521 connected to the outlet 202.

[0070] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A battery liquid cooling system, characterized by, The liquid cooling flow path module comprises: A plurality of serpentine tubes (400) are arranged side by side in the first direction (X), and the serpentine tubes (400) extend along a second direction (Y), and the serpentine tubes (400) are provided with a return flow channel extending along the length direction of the serpentine tubes (400), and the liquid inlet end and the liquid outlet end of the serpentine tubes (400) are arranged at two ends of the return flow channel, and the liquid inlet end and the liquid outlet end are located at the same end in the length direction of the serpentine tubes (400), wherein the second direction (Y) is perpendicular to the first direction (X); A plurality of expansion tubes (600) are arranged between every two adjacent serpentine tubes (400), and the expansion tubes (600) are connected by expansion, one of the two expansion tubes (600) is a liquid inlet pipe, and the other is a liquid outlet pipe, the liquid inlet pipe is connected with all the liquid inlet ends of the serpentine tubes (400), and the liquid outlet pipe is connected with all the liquid outlet ends of the serpentine tubes (400).

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

3. The battery liquid cooling system of claim 2, wherein, The end of the expansion tube (600) is provided with a flared mouth, the outer diameter of the flared mouth is M, the outer diameter of the middle part of the expansion tube (600) is N, and 1.1N 4. The battery liquid cooling system of claim 2, wherein, The expansion tube (600) is integrally formed by a double-color injection molding process.

5. The battery liquid cooling system of claim 2, wherein, The material of the inner shell (602) is flexible nylon material; and / or, The material of the outer shell (601) is hard nylon material.

6. The battery liquid cooling system of claim 1, wherein, The return flow channel is arranged in a single return structure.

7. The battery liquid cooling system of claim 6, wherein, The serpentine tube (400) comprises a serpentine flat tube (410), a collector (420) and a blocking piece (430) connected to both ends of the serpentine flat tube (410), the serpentine flat tube (410) is provided with a liquid inlet flow channel and a liquid outlet flow channel extending along the length direction, the blocking piece (430) is provided with a transfer groove, the transfer groove connects the liquid inlet flow channel and the liquid outlet flow channel, the collector (420) is provided with a first space and a second space, the first space connects the liquid inlet flow channel and the liquid inlet pipe, and the second space connects the liquid outlet flow channel and the liquid outlet pipe.

8. The battery liquid cooling system of claim 7, wherein, The current collector (420) is concavely provided with a first groove (421) and a second groove (423), a side wall of the first groove (421) is provided with a first hole (422), the first groove (421) is communicated with the first hole (422) and forms the first space, the liquid inlet channel part extends into the first groove (421), the liquid inlet pipe is inserted into the first hole (422), a side wall of the second groove (423) is provided with a second hole (424), the second groove (423) is communicated with the second hole (424) and forms the second space, the liquid outlet channel part extends into the second groove (423), and the liquid outlet pipe is inserted into the second hole (424).

9. The battery liquid cooling system of claim 8, wherein, The battery liquid cooling system further comprises a liquid inlet channel (510) and a liquid outlet channel (520) arranged on one side of all the serpentine pipes (400), one end of the liquid inlet channel (510) is provided with a liquid inlet end (511), the other end is provided with a first liquid supply end (512), the middle part of the liquid inlet channel (510) is provided with at least one second liquid supply end (513), the sum of the number of the first liquid supply end (512) and the second liquid supply end (513) is the same as the number of the liquid cooling flow path module, and the first liquid supply end (512) and each second liquid supply end (513) correspond to one liquid cooling flow path module, the first liquid supply end (512) and all the second liquid supply ends (513) are respectively inserted into one current collector (420) and communicated with the groove bottom of the corresponding first groove (421); one end of the liquid outlet channel (520) is provided with a liquid outlet end (521), the other end is provided with a first liquid discharge end (522), the middle part of the liquid outlet channel (520) is provided with at least one second liquid discharge end (523), the sum of the number of the first liquid discharge end (522) and the second liquid discharge end (523) is the same as the number of the liquid cooling flow path module, and the first liquid discharge end (522) and each second liquid discharge end (523) correspond to one liquid cooling flow path module, the first liquid discharge end (522) and all the second liquid discharge ends (523) are respectively inserted into one current collector (420) and communicated with the groove bottom of the corresponding second groove (423).

10. A battery pack, characterized by, The battery liquid cooling system further comprises a liquid inlet channel (510) and a liquid outlet channel (520) arranged on one side of all the serpentine pipes (400), one end of the liquid inlet channel (510) is provided with a liquid inlet end (511), the other end is provided with a first liquid supply end (512), the middle part of the liquid inlet channel (510) is provided with at least one second liquid supply end (513), the sum of the number of the first liquid supply end (512) and the second liquid supply end (513) is the same as the number of the liquid cooling flow path module, and the first liquid supply end (512) and each second liquid supply end (513) correspond to one liquid cooling flow path module, the first liquid supply end (512) and all the second liquid supply ends (513) are respectively inserted into one current collector (420) and communicated with the groove bottom of the corresponding first groove (421); one end of the liquid outlet channel (520) is provided with a liquid outlet end (521), the other end is provided with a first liquid discharge end (522), the middle part of the liquid outlet channel (520) is provided with at least one second liquid discharge end (523), the sum of the number of the first liquid discharge end (522) and the second liquid discharge end (523) is the same as the number of the liquid cooling flow path module, and the first liquid discharge end (522) and each second liquid discharge end (523) correspond to one liquid cooling flow path module, the first liquid discharge end (522) and all the second liquid discharge ends (523) are respectively inserted into one current collector (420) and communicated with the groove bottom of the corresponding second groove (423).

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