Battery liquid cooling device and battery pack

Abstract

The utility model discloses a battery liquid cooling device and a battery pack, the battery liquid cooling device comprises a support frame, a first liquid cooling body and a second liquid cooling body, the first liquid cooling body is arranged on the support frame, and the first liquid cooling body is provided with a first channel; the two ends of the second liquid cooling body are connected to the supporting frame and the first liquid cooling body respectively, a second channel is formed in the second liquid cooling body, a containing cavity with an upward opening is defined by the supporting frame, the first liquid cooling body and the second liquid cooling body in an enclosing mode, and the containing cavity is used for containing a battery cell; wherein the strength of the first liquid cooling body is greater than that of the second liquid cooling body, and the first liquid cooling body and the second liquid cooling body are both used for supporting the battery cell accommodated in the accommodating cavity; and under the condition that the battery cell is accommodated in the accommodating cavity, the overlapping area of the projection of the battery cell in the vertical direction and the projection of the second liquid cooling body in the vertical direction is larger than the overlapping area of the projection of the battery cell in the vertical direction and the projection of the first liquid cooling body in the vertical direction.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery liquid cooling device and a battery pack. Background Technique

[0002] CTP (Cell To Pack) technology is a technology for the structure of a battery pack without modules, that is, the battery cells are directly integrated into the battery pack, eliminating the traditional battery modules. This structure enables the battery pack to be directly integrated onto the vehicle body floor and serves as a part of the vehicle structure.

[0003] Currently, CTP technology has become the mainstream design of battery packs. For square battery cells, related technologies adopt an L-shaped tray side beam design as the support structure for the battery cells. Combining with the shape of the square battery cells, a stable and reliable "simply supported beam" load-bearing structure is formed. This structure not only ensures that the overall package mode can reach a high-frequency vibration level of 50 Hz, but also has high strength characteristics.

[0004] However, other manufacturers mostly adopt the scheme of having the battery cell poles facing upwards in the design of square battery cells. Especially for small-sized square battery cells, due to structural limitations, only bottom liquid cooling can usually be used. In this design, the battery cells are arranged above the liquid cooling plate. When the overall package space is limited and the transverse and longitudinal beams cannot be set simultaneously, the liquid cooling plate can only be used as the "floor", and the problem of insufficient strength of the liquid cooling plate itself emerges. This design poses a limitation to the mechanical properties of the battery box. Content of the Utility Model

[0005] The main purpose of the utility model is to provide a battery liquid cooling device and a battery pack, aiming to improve the support strength of the battery liquid cooling device.

[0006] To achieve the above object, a battery liquid cooling device proposed by the present utility model includes a support frame, a first liquid cooling body, and a second liquid cooling body. The first liquid cooling body is disposed on the support frame, and the first liquid cooling body is provided with a first channel; and both ends of the second liquid cooling body are respectively connected to the support frame and the first liquid cooling body, and the second liquid cooling body is provided with a second channel. The support frame, the first liquid cooling body, and the second liquid cooling body enclose and define a receiving cavity with an upward opening, and the receiving cavity is used to receive the battery cells; the first liquid cooling body and the second liquid cooling body are used to circulate a cooling medium through the second channel and the first channel to cool the battery cells accommodated in the receiving cavity; wherein, the strength of the first liquid cooling body is greater than that of the second liquid cooling body, and both the first liquid cooling body and the second liquid cooling body are used to support the battery cells accommodated in the receiving cavity; when the battery cells are accommodated in the receiving cavity, the overlapping area of the projection of the battery cells in the vertical direction and the projection of the second liquid cooling body in the vertical direction is greater than the overlapping area of the projection of the battery cells in the vertical direction and the projection of the first liquid cooling body in the vertical direction.

[0007] In an optional implementation manner of the present application, the support frame is provided with a first stepped groove, the first liquid cooling body is provided with a second stepped groove, and the groove bottom surfaces of the first stepped groove and the second stepped groove are flush; the outer peripheral edge of the second liquid cooling body is embedded in the first stepped groove and the second stepped groove.

[0008] In an optional implementation manner of the present application, the support frame includes two support cross beams, two support longitudinal beams, and a bearing beam. The two support longitudinal beams are respectively connected to opposite sides of the two support cross beams; the bearing beam is connected to the support cross beam, and the bearing beam and the first liquid cooling body are used to jointly support the battery cells accommodated in the receiving cavity.

[0009] In an optional implementation manner of the present application, the upper end surfaces of the bearing beam, the first liquid cooling body, and the second liquid cooling body are all at the same horizontal height.

[0010] In an optional implementation manner of the present application, the bearing beam and the first liquid cooling body both extend along a first direction. There are two bearing beams, and the two bearing beams are oppositely arranged along a second direction. There are multiple second liquid cooling bodies, and a first liquid cooling body is arranged between two adjacent second liquid cooling bodies. The first direction is perpendicular to the second direction.

[0011] In an optional implementation manner of the present application, the width of the first liquid cooling body is greater than twice the width of the bearing beam. One bearing beam is used to bear a row of multiple battery cells arranged in the first direction, and one first liquid cooling body is used to bear two groups of multiple battery cells arranged in the second direction.

[0012] In an alternative embodiment of the present application, the first liquid cooler is arranged in parallel and spaced apart from the load-bearing beam, the second liquid cooler is located between the load-bearing beam and the first liquid cooler, there are two second liquid coolers, and the first liquid cooler is located at the middle position of the two load-bearing beams along the second direction;

[0013] Wherein, the first liquid cooler constitutes approximately 10% of the bottom area of the accommodation cavity, and the second liquid cooler constitutes approximately 90% of the bottom area of the accommodation cavity.

[0014] In an alternative embodiment of the present application, the first liquid cooler is an extruded part; and / or

[0015] The first liquid cooler is welded to the support frame; and / or

[0016] The second channel is formed by stamping inside the second liquid cooler.

[0017] In an alternative embodiment of the present application, the second liquid cooler is provided with a liquid outlet, the liquid outlet is communicated with the second channel, the first liquid cooler is provided with a return port adjacent to the liquid outlet, and the return port is communicated with the first channel;

[0018] The battery liquid cooling device further includes a return pipeline, two ends of the return pipeline are respectively connected to the liquid outlet and the return port, and the flow direction of the cooling medium in the second channel is different from the flow direction of the cooling medium in the first channel.

[0019] A battery pack proposed by the present utility model includes the battery liquid cooling device described in any one of the above.

[0020] For the battery liquid cooling device proposed by the technical solution of the present utility model, by setting the first liquid cooler with a strength greater than that of the second liquid cooler, the problem that the strength of only the second liquid cooler is insufficient when the space of the battery liquid cooling device in the whole package is limited can be solved. The first liquid cooler can provide sufficient support for the battery cells accommodated in the accommodation cavity, ensuring the overall mechanical performance of the battery liquid cooling device.

[0021] And a first channel is arranged inside the first liquid cooler, and a second channel is arranged inside the second liquid cooler. Both the second channel and the first channel can be used to pass the cooling medium, and can dissipate heat from the battery cells accommodated in the accommodation cavity. Among them, the second liquid cooler is responsible for the main heat dissipation, while the first liquid cooler can also provide a small amount of heat dissipation for the battery cells while providing structural strength, which can meet the heat dissipation requirements of the battery cells accommodated in the accommodation cavity, and while ensuring the heat dissipation effect, improve the safety of the battery liquid cooling device and reduce the safety risk caused by the insufficient strength of the second liquid cooler. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 Assembly schematic diagram of the battery liquid cooling device provided by an embodiment of the present application;

[0024] Figure 2 Structural schematic diagram of the battery liquid cooling device provided by an embodiment of the present application;

[0025] Figure 3 For Figure 2 Structural schematic diagram of the battery liquid cooling device in from another angle;

[0026] Figure 4 For Figure 3 Cross-sectional view along the CC section in ;

[0027] Figure 5 For Figure 4 Partial enlarged view of D in ;

[0028] Figure 6 For Figure 2 Exploded structural schematic diagram of the battery liquid cooling device in ;

[0029] Figure 7 For Figure 2 Another exploded structural schematic diagram of the battery liquid cooling device in .

[0030] Explanation of the reference numerals in the drawings:

[0031] 100, battery liquid cooling device; 10, support frame; 11, first stepped groove; 12, support cross beam; 13, support longitudinal beam; 14, bearing beam; 13a, liquid supply port; 13b, discharge port; 20, first liquid cooling body; 20a, first channel; 20b, return port; 20c, outflow port; 21, second stepped groove; 30, second liquid cooling body; 30a, second channel; 30b, liquid outlet; 30c, liquid inlet; 40, return pipeline;

[0032] 200, battery cell.

[0033] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0035] Referring to "embodiments" or "embodiment manners" herein means that the specific features, structures or characteristics described in connection with the embodiments or embodiment manners may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] CTP (Cell To Pack) technology is a technology for the structure of a module-free battery pack, that is, the battery cells are directly integrated into the battery pack, eliminating the traditional battery modules. This structure enables the battery pack to be directly integrated onto the vehicle body floor and serves as a part of the vehicle structure member.

[0037] In the face of the layout with the cell pole columns facing upward and small-sized square cells widely adopted by other manufacturers, the design limitations become particularly obvious. These designs usually rely only on the bottom liquid cooling solution, with the battery cells arranged above the liquid cooling plate. Although this method meets the heat dissipation requirements to a certain extent, it also has some deficiencies.

[0038] Especially when the overall package space is limited and it is impossible to accommodate both transverse and longitudinal beams at the same time, the designer has to use the liquid cooling plate as the load-bearing "floor". Due to the relatively low structural strength of the liquid cooling plate itself, this design limits the mechanical performance of the entire battery pack.

[0039] Aiming to solve the above problems, referring to Figures 1 to 5 , a battery liquid cooling device 100 provided in an embodiment of the present application includes a support frame 10, a first liquid cooling body 20 and a second liquid cooling body 30. It can be understood that the battery liquid cooling device 100 can be applied to a battery pack, or it can be understood that the battery pack includes the battery liquid cooling device 100.

[0040] In this embodiment, the support frame 10 is made of aluminum alloy. The aluminum alloy support frame 10 is light in weight and has a certain strength, and is easy to be processed into the required shape. And the support frame 10 is a rectangular frame, which can provide a stable installation space and is convenient for arranging the square battery cells 200.

[0041] The first liquid coolant body 20 is disposed on the support frame 10. The first liquid coolant body 20 is an extruded part. The extrusion molding ensures that the first liquid coolant body 20 has a uniform wall thickness and stable mechanical properties. Moreover, the wall thickness of the first liquid coolant body 20 is thicker than that of the second liquid coolant body 30. And it is connected to the support frame 10 by welding, specifically friction stir welding, which can improve the strength and corrosion resistance at the connection between the first liquid coolant body 20 and the support frame 10. Compared with the second liquid coolant body 30, the first liquid coolant body 20 has greater strength and is used to support the battery cell 200 housed in the accommodation cavity, ensuring that the battery cell 200 is not easily deformed or damaged when subjected to external forces, enhancing the structural stability of the entire support frame 10, and helping to maintain the stable placement of the battery cell 200 within the support frame 10, and can maintain performance even in a dynamic usage environment. The first liquid coolant body 20 directly defines a first channel 20a for the circulation of the cooling medium through the extruded cavity, which can cooperate with the second channel 30a of the second liquid coolant body 30 to increase the flow path of the cooling medium and form a larger heat dissipation area.

[0042] Both ends of the second liquid coolant body 30 are respectively connected to the support frame 10 and the first liquid coolant body 20. The second liquid coolant body 30 can be made of aluminum material with high thermal conductivity. The second liquid coolant body 30 is provided with a second channel 30a. The second liquid coolant body 30 dissipates heat from the battery cell 200 through the second channel 30a. The second channel 30a is arranged in a serpentine shape along the length direction of the second liquid coolant body 30 within the second liquid coolant body 30. Specifically, the second channel 30a can be formed by stamping inside the second liquid coolant body 30. The integral stamping molding can better form a complex channel shape. The serpentine-shaped second channel 30a can increase the heat dissipation area of the cooling medium and improve the heat dissipation efficiency by increasing the flow path of the fluid in the channel. In this embodiment, to match the support frame 10 in the shape of a rectangular frame, the second liquid coolant body 30 includes a second liquid cooling plate and a thermally conductive structural adhesive disposed on the second liquid cooling plate. The second liquid cooling plate has a flat plate structure, and the side with a larger area faces the side of the battery cell 200, maximizing the heat dissipation area without increasing the overall height of the battery liquid cooling device 100 and reducing the space occupation in the height direction; the thermally conductive structural adhesive has good thermal conductivity, and it can conduct heat from the battery cell 200 to the second liquid cooling plate, improving the heat dissipation efficiency.

[0043] Among them, the support frame 10, the first liquid coolant body 20, and the second liquid coolant body 30 enclose and define an accommodation cavity with an upward opening. The accommodation cavity is used to house the battery cell 200. Both the first liquid coolant body 20 and the second liquid coolant body 30 are used to support the battery cell 200 housed in the accommodation cavity. The first liquid coolant body 20 and the second liquid coolant body 30 are used to circulate the cooling medium through the second channel 30a and the first channel 20a to cool down the battery cell 200 placed in the accommodation cavity.

[0044] When the battery cell 200 is received in the receiving cavity, the area where the projection of the battery cell 200 in the vertical direction overlaps with the projection of the second liquid cooling body 30 in the vertical direction is larger than the area where the projection of the battery cell 200 in the vertical direction overlaps with the projection of the first liquid cooling body 20 in the vertical direction. This layout ensures that the second liquid cooling body 30 can dissipate heat more effectively, while the first liquid cooling body 20 can assist in heat dissipation while providing support. While meeting the heat dissipation requirements of the battery cell 200, setting the first liquid cooling body 20 can improve the strength of supporting the battery cell 200, enhance the safety of the battery liquid cooling device 100, and reduce the safety risks caused by insufficient strength of the second liquid cooling body 30.

[0045] In actual use, the space defined by the support frame 10, the first liquid cooling body 20, and the second liquid cooling body 30 allows the pole columns of the battery cell 200 to be placed upward, that is, in a vertical position, or the pole columns of the battery cell 200 to be placed in the left-right direction, that is, in a lying position. The present application does not limit this.

[0046] In some embodiments, the support frame 10 is provided with a first stepped groove 11, the first liquid cooling body 20 is provided with a second stepped groove 21, the bottom surfaces of the first stepped groove 11 and the second stepped groove 21 are flush, and the outer peripheral edge of the second liquid cooling body 30 is embedded in the first stepped groove 11 and the second stepped groove 21, so that the second liquid cooling plate does not tilt after being embedded, and it helps to reduce the displacement of the second liquid cooling body 30 caused by vibration or impact, improving the overall safety of the battery liquid cooling device 100. The design of the first stepped groove 11 and the second stepped groove 21 enables the second liquid cooling body 30 to form a stable connection with the support frame 10 and the first liquid cooling body 20, enhancing the structural stability.

[0047] As Figure 6 shown, in some embodiments, the second liquid cooling body 30 is provided with a liquid outlet 30b, the liquid outlet 30b is communicated with the second channel 30a, the first liquid cooling body 20 is provided with a return port 20b adjacent to the liquid outlet 30b, and the return port 20b is communicated with the first channel 20a; the battery liquid cooling device 100 further includes a return pipeline 40, both ends of the return pipeline 40 are respectively connected to the liquid outlet 30b and the return port 20b, and the flow direction of the cooling medium in the second channel 30a is different from the flow direction of the cooling medium in the first channel 20a. By providing the liquid outlet 30b and the return port 20b, as well as the return pipeline 40, the cooling medium can effectively circulate between the second liquid cooling body 30 and the first liquid cooling body 20, and the first channel 20a defined by the cavity of the first liquid cooling body 20 can serve as a return water channel, thereby improving the heat dissipation efficiency of the entire battery pack.

[0048] The support frame 10 is provided with a liquid supply port 13a and a discharge port 13b. On the side of the second liquid cooler 30 opposite to the liquid outlet 30b, a liquid inlet 30c is further provided, and the liquid inlet 30c is communicated with the liquid supply port 13a; on the side of the first liquid cooler 20 opposite to the return port 20b, a liquid outlet 20c is further provided, and the liquid outlet 20c is communicated with the discharge port 13b. The liquid supply port 13a is used to input the cooling medium into the second liquid cooler 30, and the discharge port 13b is used to discharge the cooling medium from the first liquid cooler 20. And the liquid supply port 13a and the discharge port 13b are arranged on the same side of the support frame 10, which simplifies the layout of the cooling pipeline, reduces the complexity of the pipeline, and facilitates installation and maintenance.

[0049] Specifically, both the liquid outlet 30b and the liquid inlet 30c are arranged on the upper end surface of the second liquid cooler 30, and both the return port 20b and the liquid outlet 20c are arranged on the upper end surface of the first liquid cooler 20. The liquid inlet 30c is adjacent to the liquid supply port 13a to ensure that the cooling medium can smoothly enter the second liquid cooler 30. And the liquid outlet 20c is adjacent to the discharge port 13b so that the cooling medium can be discharged after completing the cycle. Since the input and output paths of the cooling medium are clear and direct, potential failure points are reduced, and the reliability of the entire cooling flow path is enhanced.

[0050] It can be understood that in this embodiment, the second channel 30a of the second liquid cooler 30 is used as the incoming flow channel, and the first channel 20a of the first liquid cooler 20 is used as the return channel. Of course, the second channel 30a of the second liquid cooler 30 can also be used as the return channel, and the first channel 20a of the first liquid cooler 20 can be used as the incoming flow channel. The present application does not limit this.

[0051] As Figure 7 shown, in some embodiments, the support frame 10 includes two support cross beams 12, two support longitudinal beams 13, and a bearing beam 14. The two support longitudinal beams 13 are respectively connected to the opposite sides of the two support cross beams 12 to form a stable support structure. The bearing beam 14 is connected to the support cross beam 12. The bearing beam 14 and the first liquid cooler 20 are used to jointly support both ends of the battery cell 200 housed in the housing cavity, which can significantly enhance the structural stability of the support frame 10, reduce the risk of damage to the battery cell 200 caused by vibration or impact, and improve the overall safety of the support frame 10. When the battery cells 200 are arranged in the housing cavity, both ends of the battery cells 200 can be respectively supported by the bearing beam 14 and the first liquid cooler 20, more evenly dispersing the gravity of the battery cells 200 and reducing the local pressure on the battery cells 200, thereby reducing the risk of damage to the battery cells 200.

[0052] Among them, the bearing beam 14 and the support cross beam 12 are integrally formed, which enhances the integrity of the support frame 10, reduces stress concentration at the connection, reduces the formation of fatigue cracks, thereby improving the durability of the support frame 10 and the integrity of the structure.

[0053] Specifically, the load-bearing beam 14 is located at the connection of the support cross beam 12 and the support longitudinal beam 13. As an additional support structure, the load-bearing beam 14 works together with the support cross beam 12 and the support longitudinal beam 13 to improve the stability of the entire support frame 10, help reduce the space occupation inside the support frame 10, make the battery pack design more compact, and can effectively bear and disperse the weight of the battery cells 200 and the possible external impacts, reducing local stress concentration.

[0054] In some embodiments, the upper end faces of the load-bearing beam 14, the first liquid cooling body 20, and the second liquid cooling body 30 are all at the same horizontal height. That is, along the height direction, the end face of the load-bearing beam 14 in contact with the first liquid cooling body 20 is flush with the end face of the battery cell 200, ensuring that the load-bearing beam 14 and the first liquid cooling body 20 jointly support both ends of the battery cell 200, ensuring uniform force on both ends of the battery cell 200, avoiding deformation or damage of the battery cell 200 caused by uneven support, improving the rigidity of the entire battery liquid cooling device 100, and reducing the decline in load-bearing performance caused by structural deformation. The flush design also helps to simplify the installation process of the battery cell 200, ensuring that the battery cell 200 is correctly placed in the predetermined position and does not slip in the receiving cavity.

[0055] Please refer to Figure 2 , in some embodiments, both the load-bearing beam 14 and the first liquid cooling body 20 extend along the first direction AA. There are two load-bearing beams 14, and the two load-bearing beams 14 are arranged opposite to each other along the second direction BB and are arranged in parallel at intervals. It can be understood that when the support frame 10 is a rectangular frame, both the load-bearing beam 14 and the first liquid cooling body 20 extend along the length direction of the support frame 10, and the load-bearing beam 14 is arranged opposite to each other along the width direction of the support frame 10. The load-bearing beam 14 is used to provide uniform support and reduce the vibration influence of the battery cell 200 in the vertical direction. There are multiple second liquid cooling bodies 30, which can better absorb the heat generated by the battery cells 200 and dissipate heat through the second liquid cooling bodies 30, improving the heat dissipation performance of the entire battery pack. A first liquid cooling body 20 is arranged between two adjacent second liquid cooling bodies 30, that is, both sides of the second liquid cooling plate in the width direction of the support frame 10 are in contact with a first liquid cooling plate respectively. A first liquid cooling plate is arranged between the load-bearing beam 14 and the adjacent first liquid cooling body 20, and the load-bearing beam 14 is in contact with this first liquid cooling plate. The arrangement of the load-bearing beam 14, the second liquid cooling body 30, and the first liquid cooling body 20 makes full use of the space of the support frame 10, allowing the first liquid cooling body 20 to provide additional support and heat dissipation for the battery cell 200 while maintaining the structural compactness of the battery liquid cooling device 100, where the first direction AA is perpendicular to the second direction BB.

[0056] It is understandable that the length and width of the support frame 10 can be increased according to actual use, and the number of the first liquid cooling members can be adjusted to adapt to the design of the support frame 10 with different sizes and shapes, and to accommodate more battery cells 200.

[0057] In some embodiments, intermediate ribs are further provided in the first liquid cooling body 20. The intermediate ribs divide the cavity into a first cavity and a second cavity. The intermediate ribs can strengthen the strength of the first liquid cooling body 20 and improve its stability when bearing external loads. The first cavity can be used in cooperation with the second channel 30a of the second liquid cooling body 30 on the opposite side, and the second cavity can also be used in cooperation with the second channel 30a of another second liquid cooling body 30 on the opposite side.

[0058] Specifically, the plurality of liquid inlets 30c corresponding to the plurality of second liquid cooling bodies 30 are all communicated with the above-mentioned liquid supply port 13a. Correspondingly, if there are a plurality of first liquid cooling bodies 20, the plurality of liquid outlets 20c corresponding to the plurality of first liquid cooling bodies 20 are all communicated with the above-mentioned discharge port 13b. Since the same liquid supply port 13a and discharge port 13b are shared, only one connection point needs to be processed during maintenance and replacement, which reduces the maintenance difficulty, simplifies the pipeline layout of the cooling flow path, ensures the orderly flow of the cooling medium and effective heat dissipation, and reduces the pipeline connection points, thereby reducing the risks of pipeline blockage and leakage.

[0059] In some embodiments, the width of the first liquid cooling body 20 is greater than twice the width of the bearing beam 14. One bearing beam 14 is used to bear a row of multiple battery cells 200 arranged in the first direction AA, allowing the battery cells 200 to be closely arranged longitudinally, and at the same time providing uniform support by the bearing beam 14. One first liquid cooling body 20 is used to bear two groups of multiple battery cells 200 arranged in the second direction BB. By increasing the width of the first liquid cooling body 20, sufficient heat dissipation surfaces can be provided for two groups of battery cells 200 simultaneously in the transverse direction, while maintaining the compactness of the battery liquid cooling device 100.

[0060] In some embodiments, the first liquid cooling bodies 20 and the bearing beams 14 are arranged in parallel at intervals, and the second liquid cooling bodies 30 are located between the bearing beams 14 and the first liquid cooling bodies 20. There are two second liquid cooling bodies 30. The first liquid cooling bodies 20 are located at the middle positions of the two bearing beams 14 along the second direction BB, providing a uniform cooling effect for the two groups of battery cells 200 supported by the first liquid cooling bodies 20 and enhancing the heat dissipation effect.

[0061] Among them, the second liquid cooling bodies 30 constitute approximately 90% of the bottom area of the accommodation cavity, ensuring sufficient heat dissipation in the main area of the battery cells 200, while the first liquid cooling bodies 20 constitute approximately 10% of the bottom area of the accommodation cavity, making the battery liquid cooling device 100 structurally compact and not occupying too much space. This area distribution ensures the maximum heat dissipation efficiency within a limited space, while maintaining the structural compactness and the stability of the battery cells 200.

[0062] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the inventive concept of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A battery liquid cooling device, characterized in that: include: Support frame; A first liquid cooling body is arranged on the supporting frame, wherein the first liquid cooling body is provided with a first channel; as well as A second liquid cooling body, two ends of which are respectively connected to the support frame and the first liquid cooling body, the second liquid cooling body is provided with a second channel, the support frame, the first liquid cooling body and the second liquid cooling body are surrounded and defined to define a receiving cavity with an upward opening, the receiving cavity is used to receive the battery cell; The first liquid cooling body and the second liquid cooling body are used to circulate cooling medium through the second channel and the first channel to cool the battery cell accommodated in the accommodation cavity; Wherein, the strength of the first liquid cooling body is greater than that of the second liquid cooling body, and the first liquid cooling body and the second liquid cooling body are both used to support the battery cell accommodated in the accommodation cavity; When the battery cell is accommodated in the accommodating cavity, an overlapping area between the projection of the battery cell in the vertical direction and the projection of the second liquid cooler in the vertical direction is greater than an overlapping area between the projection of the battery cell in the vertical direction and the projection of the first liquid cooler in the vertical direction.

2. The battery liquid cooling device according to claim 1, characterized in that: The support frame is provided with a first step groove, the first liquid cooling body is provided with a second step groove, and the first step groove is flush with the bottom surface of the second step groove; The outer periphery of the second liquid cooling body is embedded in the first stepped groove and the second stepped groove.

3. The battery liquid cooling device according to claim 2, characterized in that: The support frame comprises: Two supporting cross beams and two supporting longitudinal beams, wherein the two supporting longitudinal beams are respectively connected to opposite sides of the two supporting cross beams; A load-bearing beam is connected to the supporting crossbeam, and the load-bearing beam and the first liquid cooling body are used to jointly support the battery cell accommodated in the accommodation cavity.

4. The battery liquid cooling device according to claim 3, characterized in that: The upper end surfaces of the load-bearing beam, the first liquid-cooling body and the second liquid-cooling body are all located at the same horizontal height.

5. The battery liquid cooling device according to any one of claims 3 to 4, characterized in that: The load-bearing beam and the first liquid cooler are both extended along the first direction. Two load-bearing beams are provided, and the two load-bearing beams are arranged opposite to each other along the second direction. Multiple second liquid coolers are provided, and one first liquid cooler is arranged between two adjacent second liquid coolers. The first direction is perpendicular to the second direction.

6. The battery liquid cooling device according to claim 5, characterized in that: The width of the first liquid cooler is greater than twice the width of the load-bearing beam. The load-bearing beam is used to support a row of multiple battery cells arranged in the first direction, and the first liquid cooler is used to support two groups of multiple battery cells arranged in the second direction.

7. The battery liquid cooling device according to claim 6, characterized in that: The first liquid cooling body is arranged in parallel and spaced apart from the load beam, the second liquid cooling body is located between the load beam and the first liquid cooling body, two second liquid cooling bodies are provided, and the first liquid cooling body is located in the middle of the two load beams along the second direction; The first liquid cooling body constitutes about 10% of the bottom area of ​​the receiving cavity, and the second liquid cooling body constitutes about 90% of the bottom area of ​​the receiving cavity.

8. The battery liquid cooling device according to claim 1, characterized in that: The first liquid cooling body is an extruded part; and / or The first liquid cooling body is connected to the supporting frame by welding; and / or The second channel is punched inside the second liquid cooling body.

9. The battery liquid cooling device according to claim 1, characterized in that: The second liquid cooling body is provided with a liquid outlet, the liquid outlet is communicated with the second channel, and the first liquid cooling body is provided with a reflux port arranged adjacent to the liquid outlet, the reflux port is communicated with the first channel; The battery liquid cooling device also includes a reflux pipeline, two ends of which are respectively connected to the liquid outlet and the reflux port, and a flow direction of the cooling medium in the second channel is different from a flow direction of the cooling medium in the first channel.

10. A battery pack, characterized in that: Comprising a battery liquid cooling device as claimed in any one of claims 1 to 9.

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