Battery liquid-cooling device and battery pack

Abstract

To provide a battery liquid-cooling device and a battery pack which enhance support strength.SOLUTION: The pipe liquid cooling device 0 includes a support frame, and first and second liquid cooling bodies 20, 30, the first liquid cooling body is installed on the support frame, and a first channel 20a is opened, and the second liquid cooling body has both ends connected to the support frame and the first liquid cooling body, respectively. A second channel side 30a is provided, the supporting frame, the first liquid cooler and the second liquid cooler enclose and define an accommodating cavity having an upward opening and configured to accommodate the battery core, a strength of the first liquid cooler is greater than a strength of the second liquid cooler, and the first liquid cooler and the second liquid cooler are both configured to support the battery core accommodated in the accommodating cavity; When the cell is received in the receiving cavity, an overlapping area of a projection of the cell in the longitudinal direction and a projection of the second liquid cooler in the longitudinal direction is greater than an overlapping area of the projection of the cell in the longitudinal direction and a projection of the first liquid cooler in the longitudinal direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to the field of battery technology, and more particularly to a battery liquid cooling device and a battery pack. [Background technology]

[0002] CTP (Cell To Pack) technology is a module-less battery pack structure technology that integrates cells directly into the battery pack, eliminating the need for conventional battery modules. This structure allows the battery pack to be directly integrated into the vehicle floor as part of the structural components of the completed vehicle.

[0003] Currently, CTP technology has become the mainstream in battery pack design. For prismatic cells, the related technology uses an L-shaped tray side beam design as the cell support structure, which, combined with the prismatic cell shape, forms a stable and reliable "simply supported beam" support structure. This structure not only ensures that the overall package modal can achieve a high-frequency vibration level of 50Hz, but also has high strength characteristics.

[0004] However, other manufacturers often use designs with the cell poles facing upward in their prismatic cell designs. Due to structural constraints, especially for small prismatic cells, bottom liquid cooling is usually the only option. In this design, the cells are positioned above the liquid-cooled plate. Given the limited space available in the entire package, the horizontal and vertical beams cannot be installed simultaneously, so the liquid-cooled plate can only be used as a "floor," exposing the lack of strength of the liquid-cooled plate itself. This design limits the mechanical performance of the enclosure. Summary of the Invention [Problem to be solved by the invention]

[0005] A primary object of the present invention is to provide a battery liquid cooling device and a battery pack that are intended to increase the support strength of the battery liquid cooling device. [Means for solving the problem]

[0006] In order to achieve the above object, the battery liquid cooling device proposed in the present invention includes a support frame, a first liquid cooling body provided on the support frame and having a first passage opened therein, and a second liquid cooling body connected at both ends to the support frame and the first liquid cooling body, respectively, and having a second passage opened therein, wherein the support frame, the first liquid cooling body, and the second liquid cooling body surround and define a storage cavity having an upward opening and used to store cells, and the first liquid cooling body and the second liquid cooling body cool the battery liquid by circulating a cooling medium through the second passage and the first passage. a battery liquid cooling device used to lower the temperature of a cell housed in the accommodating cavity by using a first liquid cooling body having a strength greater than that of the second liquid cooling body, the first liquid cooling body and the second liquid cooling body being both used to support the cell housed in the accommodating cavity, and when the cell is housed in the accommodating cavity, an overlapping area between a vertical projection of the cell and a vertical projection of the second liquid cooling body is greater than an overlapping area between a vertical projection of the cell and a vertical projection of the first liquid cooling body.

[0007] In an alternative embodiment of the present application, a first stepped groove is formed in the support frame, a second stepped groove is formed in the first liquid cooling body, the first stepped groove is flush with the bottom surface of the second stepped groove, and the outer periphery of the second liquid cooling body is fitted into the first stepped groove and the second stepped groove.

[0008] In an alternative embodiment of the present application, the support frame includes two horizontal support beams and two vertical support beams, each of which has two vertical support beams connected to opposite sides of the two horizontal support beams, and a support beam connected to the horizontal support beams, wherein the support beam and the first liquid cooling body are used to together support the cells contained in the containment cavity.

[0009] In an alternative embodiment of the present application, the upper end surfaces of the support beam, the first liquid cooling body, and the second liquid cooling body are all located at the same level.

[0010] In an alternative embodiment of the present application, the support beam and the first liquid cooling body both extend along a first direction, two of the support beams are arranged opposite each other along a second direction, a plurality of the second liquid cooling bodies are provided, one of the first liquid cooling bodies is provided between two adjacent second liquid cooling bodies, and the first direction is perpendicular to the second direction.

[0011] In an alternative embodiment of the present application, the width of the first liquid cooling body is greater than twice the width of the support beam, the support beam is used to receive one row of the cells arranged in the first direction, and the first liquid cooling body is used to receive two sets of the cells arranged in the second direction.

[0012] In an alternative embodiment of the present application, the first liquid cooling body is arranged parallel to the support beam at a distance from the support beam, two second liquid cooling bodies are provided and are located between the support beam and the first liquid cooling body, and the first liquid cooling body is arranged at a middle position between the two support beams in the second direction, The first liquid cooling body constitutes approximately 10% of the cavity bottom area of ​​the accommodating cavity, and the second liquid cooling body constitutes approximately 90% of the cavity bottom area of ​​the accommodating cavity.

[0013] In an alternative embodiment of the present application, the first liquid cooling body is an extrusion; and / or the first liquid cooling body is welded to the support frame; and / or The second passage is press-formed inside the second liquid cooling body.

[0014] In an alternative embodiment of the present application, the second liquid cooling body has a liquid outlet that is in communication with the second passage, and the first liquid cooling body has a return port that is adjacent to the liquid outlet, and the return port is in communication with the first passage; The battery liquid cooling device further includes a return pipe whose two ends are connected to the liquid outlet and the return port, respectively, and the flow direction of the cooling medium in the second passage is different from the flow direction of the cooling medium in the first passage.

[0015] The battery pack proposed by the present invention includes any one of the battery liquid cooling devices described above. [Effects of the Invention]

[0016] The battery liquid cooling device proposed in the technical solution of the present invention uses a first liquid cooling body that is stronger than the second liquid cooling body, thereby solving the problem of insufficient strength caused by installing only the second liquid cooling body when the entire package of the battery liquid cooling device is spatially limited. The first liquid cooling body provides sufficient support for the cells housed within the housing cavity, ensuring the overall mechanical performance of the battery liquid cooling device.

[0017] In addition, a first passage is provided within the first liquid cooling body, and a second passage is provided within the second liquid cooling body. Both the second passage and the first passage allow a cooling medium to pass through, thereby dissipating heat from the cells accommodated in the accommodating cavity. Of these, the second liquid cooling body is mainly responsible for heat dissipation, while the first liquid cooling body provides structural strength and can also dissipate a small amount of heat from the cells, thereby meeting the heat dissipation requirements of the cells accommodated in the accommodating cavity. In addition to ensuring the heat dissipation effect, this also improves the safety of the battery liquid cooling device and reduces safety risks caused by the insufficient strength of the second liquid cooling body. [Brief explanation of the drawings]

[0018] In order to more clearly explain the technical solutions in the embodiments of the present invention or the prior art, the drawings that need to be used in the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on the structures shown in these drawings without any creative work. [Figure 1]FIG. 1 is a schematic assembly diagram of a battery liquid cooling device provided in one embodiment of the present application. [Figure 2] 1 is a schematic diagram of a battery liquid cooling device provided in one embodiment of the present application. [Figure 3] 3 is a schematic configuration diagram of the battery liquid cooling device in FIG. 2 from another angle. FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the CC section in FIG. [Figure 5] FIG. 5 is an enlarged view of a portion indicated by D in FIG. [Figure 6] FIG. 3 is an exploded structural schematic diagram of the battery liquid cooling device in FIG. 2. [Figure 7] 3 is another exploded structural schematic view of the battery liquid cooling device in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0019] The realization of the objects, functional features and advantages of the present invention will be further explained in combination with the embodiments and with reference to the drawings.

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and does not impose any restrictions on the present application and its application or use. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative effort fall within the scope of protection of the present application.

[0021] The term "example" or "embodiment" referred to herein means that a particular feature, structure, or characteristic described in connection with the example or embodiment can be included in at least one example of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same example, nor does it refer to an example that is exclusively independent of or alternative to other examples. Those skilled in the art will understand, both explicitly and implicitly, that the examples described herein can be combined with other embodiments.

[0022] CTP (Cell To Pack) technology is a module-less battery pack structure technology that integrates cells directly into the battery pack, eliminating the need for conventional battery modules. This structure allows the battery pack to be directly integrated into the vehicle floor as part of the structural components of the completed vehicle.

[0023] The design limitations are particularly pronounced when faced with the pole-up layout widely adopted by other manufacturers and the small size of prismatic cells. These designs typically rely solely on bottom liquid cooling, placing the cells on a liquid-cooled plate. While this approach meets heat dissipation requirements to some extent, it also introduces several drawbacks.

[0024] In particular, when the overall package is spatially limited and cannot simultaneously accommodate both horizontal and vertical beams, designers are forced to use the liquid-cooled plate as a load-bearing "floor." This design limits the mechanical performance of the entire battery pack because the liquid-cooled plate itself does not have a high structural strength.

[0025] To solve the above problems, with reference to Figures 1 to 5, an embodiment of the present application provides a battery liquid cooling device 100 including a support frame 10, a first liquid cooling body 20, and a second liquid cooling body 30. The battery liquid cooling device 100 can be applied to a battery pack, or it can be understood that the battery pack includes this battery liquid cooling device 100.

[0026] In this embodiment, the support frame 10 is made of an aluminum alloy. The aluminum alloy support frame 10 is lightweight, has a certain strength, and is easy to process and mold into the required shape. In addition, the support frame 10 is a rectangular frame, which provides a gentle installation space and makes it easy to arrange the prismatic cells 200.

[0027] The first liquid cooling body 20 is an extrusion molded product and is installed on the support frame 10. The extrusion process ensures that the first liquid cooling body 20 has a uniform thickness and stable mechanical performance. The first liquid cooling body 20 is thicker than the second liquid cooling body 30 and is connected to the support frame 10 by welding, thereby improving the strength and corrosion resistance of the connection between the first liquid cooling body 20 and the support frame 10. However, the welding method may be friction stir welding. The first liquid cooling body 20 has greater strength than the second liquid cooling body 30 and is used to support the cells 200 housed in the housing cavity. This ensures that the cells 200 do not deform or break when subjected to external forces, strengthens the structural stability of the entire support frame 10, and helps maintain the stability of the cells 200 within the support frame 10, thereby maintaining performance even in dynamic environments. The first liquid cooling body 20 directly defines the first passage 20a through which the cooling medium flows by the extruded die cavity, and can be used in combination with the second passage 30a of the second liquid cooling body 30 to increase the cooling medium flow path and form a larger heat dissipation area.

[0028] The second liquid cooling body 30 is made of aluminum, which has high thermal conductivity, and its ends are connected to the support frame 10 and the first liquid cooling body 20, respectively. The second liquid cooling body 30 has second passages 30a, through which heat is dissipated from the cells 200. The second passages 30a are bent in a serpentine shape along the length of the second liquid cooling body 30. Specifically, the second passages 30a are formed by pressing the second liquid cooling body 30 into the interior, and integral press molding makes it possible to more effectively form complex passage shapes. The second passages 30a are bent in a serpentine shape, which increases the heat dissipation area of ​​the cooling medium and improves heat dissipation efficiency by increasing the fluid flow path within the passages. In this embodiment, in order to fit the rectangular support frame 10, the second liquid cooling body 30 includes a second liquid cooling plate and a thermally conductive structural rubber provided on the second liquid cooling plate. The second liquid cooling plate has a flat structure, with the larger surface facing the cell 200. This maximizes the heat dissipation area and reduces the amount of space occupied in the vertical direction without increasing the overall height of the battery liquid cooling device 100. The thermally conductive structural rubber has good thermal conductivity and can conduct heat from the battery cell 200 to the second liquid cooling plate, improving heat dissipation efficiency.

[0029] Among them, the support frame 10, the first liquid cooling body 20, and the second liquid cooling body 30 surround and define a accommodating cavity having an upward opening and used to accommodate the cell 200, and the first liquid cooling body 20 and the second liquid cooling body 30 both support the cell 200 accommodated in the accommodating cavity and are used to lower the temperature of the cell 200 accommodated in the accommodating cavity by circulating a cooling medium through the second passage 30a and the first passage 20a.

[0030] When the cell 200 is accommodated in the accommodation cavity, the overlapping area between the vertical projection of the cell 200 and the vertical projection of the second liquid cooling body 30 is larger than the overlapping area between the vertical projection of the cell 200 and the vertical projection of the first liquid cooling body 20. This layout allows the second liquid cooling body 30 to dissipate heat more effectively, while the first liquid cooling body 20 provides support and assists heat dissipation. In addition to meeting the heat dissipation requirements of the cell 200, the installation of the first liquid cooling body 20 increases the strength to support the cell 200, improving the safety of the battery liquid cooling device 100 and reducing safety risks due to insufficient strength of the second liquid cooling body 30.

[0031] In actual use, in the space defined by the support frame 10, the first liquid cooling body 20, and the second liquid cooling body 30, the poles of the cells 200 may be placed with their poles facing upward, i.e., vertically, or with their poles facing left and right, i.e., horizontally, but this is not a limitation of the present application.

[0032] In some embodiments, a first stepped groove 11 is formed in the support frame 10, and a second stepped groove 21 is formed in the first liquid cooling body 20, the first stepped groove 11 being flush with the bottom surface of the second stepped groove 21, and the outer periphery of the second liquid cooling body 30 being fitted into the first stepped groove 11 and the second stepped groove 21, preventing the second liquid cooling plate from tilting after fitting and contributing to reducing displacement of the second liquid cooling body 30 due to vibration or impact, thereby improving the safety of the entire battery liquid cooling device 100. The design of the first stepped groove 11 and the second stepped groove 21 allows the second liquid cooling body 30 to form a strong connection with the support frame 10 and the first liquid cooling body 20, enhancing the stability of the structure.

[0033] 6, in some embodiments, the second liquid cooling body 30 has a liquid outlet 30b communicating with the second passage 30a, and the first liquid cooling body 20 has a return port 20b adjacent to the liquid outlet 30b and communicating with the first passage 20a. The battery liquid cooling device 100 further includes a return pipe 40 having both ends connected to the liquid outlet 30b and the return port 20b, respectively. The flow direction of the cooling medium in the second passage 30a is different from the flow direction of the cooling medium in the first passage 20a. By providing the liquid outlet 30b, the return port 20b, and the return pipe 40, the cooling medium can be effectively circulated between the second liquid cooling body 30 and the first liquid cooling body 20. Meanwhile, the first passage 20a defined by the die cavity of the first liquid cooling body 20 can serve as a water return passage, thereby improving the heat dissipation efficiency of the entire battery pack.

[0034] The support frame 10 is provided with a liquid supply port 13a and a discharge port 13b, and is further provided with a liquid inlet 30c communicating with the liquid supply port 13a on the side opposite the liquid outlet 30b of the second liquid cooling body 30, and is further provided with an outlet 20c communicating with the discharge port 13b on the side opposite the return port 20b of the first liquid cooling body 20. The liquid supply port 13a is used to supply the cooling medium to the second liquid cooling body 30, while the discharge port 13b is used to discharge the cooling medium from the first liquid cooling body 20. Furthermore, the liquid supply port 13a and the discharge port 13b are located on the same side of the support frame 10, which simplifies the layout of the cooling duct, reduces the complexity of the duct, and facilitates installation and maintenance.

[0035] Specifically, the liquid outlet 30b and the liquid inlet 30c are both located on the upper end surface of the second liquid cooling body 30, while the return port 20b and the outlet port 20c are both located on the upper end surface of the first liquid cooling body 20. The liquid inlet 30c is located adjacent to the liquid supply port 13a, ensuring that the cooling medium can smoothly enter the second liquid cooling body 30. Meanwhile, the outlet port 20c is located adjacent to the outlet port 13b, allowing the cooling medium to be discharged after circulation is complete. The clear and direct paths for the cooling medium inlet and outlet reduce potential failure points and enhance the reliability of the entire cooling flow path.

[0036] As can be understood, in this embodiment, the second passage 30a of the second liquid cooling body 30 is the inlet passage and the first passage 20a of the first liquid cooling body 20 is the return passage, but of course, the second passage 30a of the second liquid cooling body 30 may be the return passage and the first passage 20a of the first liquid cooling body 20 may be the inlet passage, which is not limited in the present application.

[0037] As shown in FIG. 7 , in some embodiments, the support frame 10 includes two horizontal support beams 12, two vertical support beams 13, and a support beam 14. The two vertical support beams 13 are connected to opposite sides of the two horizontal support beams 12, respectively, to form a stable support structure. The support beams 14 are connected to the horizontal support beams 12, and the support beams 14 and the first liquid cooling body 20 are used to support both ends of the cell 200 accommodated in the accommodating cavity. This significantly enhances the structural stability of the support frame 10, reduces the risk of damage to the cell 200 due to vibration or impact, and improves the overall safety of the support frame 10. When the cell 200 is placed in the accommodating cavity, both ends of the cell 200 are supported by the support beams 14 and the first liquid cooling body 20, respectively, which distributes the gravity of the cell 200 more evenly and reduces local pressure on the cell 200, thereby reducing the risk of damage to the cell 200.

[0038] The support beams 14 are integrally formed with the lateral support beams 12, which strengthens the integrity of the support frame 10, reduces stress concentration at the connection points, and reduces the formation of fatigue cracks, thereby improving the durability and structural integrity of the support frame 10.

[0039] Specifically, the support beam 14 is located at the connection point between the horizontal support beam 12 and the vertical support beam 13, and as an additional support structure, the support beam 14 cooperates with the horizontal support beam 12 and the vertical support beam 13 to increase the stability of the entire support frame 10 and contribute to reducing the amount of space occupied inside the support frame 10, making the design of the battery pack more compact, and effectively receiving and dispersing the weight of the cells 200 and any external impacts that may be received, thereby reducing local stress concentrations.

[0040] In some embodiments, the upper surfaces of the support beam 14, the first liquid cooling body 20, and the second liquid cooling body 30 are all located at the same level. That is, the contact surfaces of the support beam 14, the first liquid cooling body 20, and the cell 200 are flush along the height direction, ensuring that the support beam 14 and the first liquid cooling body 20 support both ends of the cell 200, allowing force to be applied evenly to both ends of the cell 200, preventing deformation or damage to the cell 200 due to uneven support, improving the overall rigidity of the battery liquid cooling device 100, and reducing a decrease in load-bearing capacity due to structural deformation. The flush design simplifies the installation process of the cell 200, ensuring that the cell 200 is correctly positioned and does not slip within the receiving cavity.

[0041] Referring to FIG. 2, in some embodiments, the support beams 14 and the first liquid cooling body 20 both extend along the first direction AA, and two support beams 14 are installed, and the two support beams 14 are installed opposite each other along the second direction BB and are arranged parallel to each other at a distance. As can be understood, when the support frame 10 is a rectangular frame, the support beams 14 and the first liquid cooling body 20 both extend along the longitudinal direction of the support frame 10, and the support beams 14 are installed opposite each other along the width direction of the support frame 10, and are used to reduce the effects of vertical vibration of the cell 200 by providing uniform support. The second liquid cooling bodies 30 are installed in multiple locations, which can better absorb heat generated by the cells 200. Furthermore, the heat dissipation effect of the second liquid cooling bodies 30 improves the heat dissipation performance of the entire battery pack. Meanwhile, a first liquid cooling body 20 is installed between two adjacent second liquid cooling bodies 30. That is, both sides of the second liquid cooling plate along the width direction of the support frame 10 abut against the first liquid cooling plate. A first liquid cooling plate is installed between the support beam 14 and the adjacent first liquid cooling body 20. The support beam 14 abuts against this first liquid cooling plate. The arrangement of the support beam 14, second liquid cooling bodies 30, and first liquid cooling bodies 20 fully utilizes the space of the support frame 10, allowing the first liquid cooling body 20 to provide additional support and heat dissipation effect for the cells 200 while maintaining the compactness of the battery liquid cooling device 100. The first direction AA is perpendicular to the second direction BB.

[0042] As can be understood, the length and width of the support frame 10 can be increased depending on the actual use, and the number of first liquid cooling bodies can be adjusted to accommodate support frame 10 designs of different sizes and shapes, allowing more cells 200 to be accommodated.

[0043] In some embodiments, an intermediate rib is provided in the first liquid cooling body 20 to separate the die cavity into a first die cavity and a second die cavity, and the intermediate rib can strengthen the strength of the first liquid cooling body 20 and improve its stability when subjected to an external load. Also, the first die cavity can be used in conjunction with the second passage 30a of the second liquid cooling body 30 on the opposite side, and the second die cavity can also be used in conjunction with the second passage 30a of another second liquid cooling body 30 on the opposite side.

[0044] Specifically, the multiple liquid inlets 30c corresponding to the multiple second liquid cooling bodies 30 are all connected to the liquid supply port 13a, and accordingly, if multiple first liquid cooling bodies 20 are installed, the multiple outlets 20c corresponding to the multiple first liquid cooling bodies 20 are all connected to the liquid discharge port 13b, and share the same liquid supply port 13a and discharge port 13b. Therefore, when maintenance or replacement is required, only one connection point needs to be handled, which makes maintenance easier, simplifies the duct layout of the cooling flow path, ensures orderly flow of the cooling medium and effective heat dissipation, and reduces the number of duct connection points, thereby reducing the risk of duct clogging and leakage.

[0045] In some embodiments, the width of the first liquid cooling body 20 is greater than twice the width of the support beams 14, and the support beams 14 are used to receive a row of multiple cells 200 arranged in the first direction AA, allowing the cells 200 to be closely aligned in the vertical direction and uniformly supported by the support beams 14. The first liquid cooling body 20 is used to receive two sets of multiple cells 200 arranged in the second direction BB. By increasing the width of the first liquid cooling body 20, it is possible to simultaneously provide a sufficient heat dissipation surface for the two sets of cells 200 in the horizontal direction while maintaining the compactness of the battery liquid cooling device 100.

[0046] In some embodiments, the first liquid cooling body 20 is arranged parallel to and spaced apart from the support beam 14, the second liquid cooling body 30 is located between the support beam 14 and the first liquid cooling body 20, two second liquid cooling bodies 30 are provided, and the first liquid cooling body 20 is located at an intermediate position along the second direction BB between the two support beams 14, providing a uniform cooling effect to both of the two sets of cells 200 supported by the first liquid cooling body 20 and enhancing the heat dissipation effect.

[0047] The second liquid cooling body 30 accounts for approximately 90% of the cavity bottom area of ​​the accommodating cavity, ensuring sufficient heat dissipation for the main area of ​​the cells 200, while the first liquid cooling body 20 accounts for approximately 10% of the cavity bottom area of ​​the accommodating cavity, making the structure of the battery liquid cooling device 100 compact and not taking up too much space. This area allocation achieves maximum heat dissipation efficiency within the limited space while maintaining the compactness of the structure and the stability of the cells 200.

[0048] The above is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention under the concept of the present invention, or any direct / indirect application to other related technical fields, is included in the patent protection scope of the present invention. [Explanation of symbols]

[0049] 100 Battery liquid cooling device 10 Support Frame 11 First stepped groove 12 Lateral support beam 13 Longitudinal support beam 14 Support beam 13a Liquid supply port 13b Outlet 20 First liquid cooling body 20a First Passage 20b Reflux port 20c outlet 21 Second stepped groove 30 Second liquid cooling body 30a Second Passage 30b liquid outlet 30c liquid inlet 40 Return piping 200 cells

Claims

1. A support frame; a first liquid cooling body provided on the support frame and having a first passage; a second liquid cooling body, the second liquid cooling body having opposite ends connected to the support frame and the first liquid cooling body, and a second passageway formed therein; the support frame, the first liquid cooling body, and the second liquid cooling body surround and define a storage cavity having an upward opening, the storage cavity being used to store a cell; the first liquid cooling body and the second liquid cooling body are used to lower the temperature of the cells accommodated in the accommodating cavity by circulating a cooling medium through the second passage and the first passage, a strength of the first liquid cooling body is greater than a strength of the second liquid cooling body, and both the first liquid cooling body and the second liquid cooling body are used to support the cells accommodated in the accommodation cavity; when the cell is accommodated in the accommodation cavity, an overlapping area between a projection of the cell in the vertical direction and a projection of the second liquid cooling body in the vertical direction is larger than an overlapping area between a projection of the cell in the vertical direction and a projection of the first liquid cooling body in the vertical direction; A battery liquid cooling device characterized by:

2. a first stepped groove is formed in the support frame, a second stepped groove is formed in the first liquid cooling body, and the first stepped groove is flush with a groove bottom surface of the second stepped groove; an outer circumferential edge of the second liquid cooling body is fitted into the first stepped groove and the second stepped groove; 2. The battery liquid cooling device according to claim 1.

3. The support frame includes: two vertical support beams connected to opposite sides of two horizontal support beams, respectively; and two horizontal support beams and two vertical support beams. a support beam connected to the lateral support beam, the support beam and the first liquid cooling body being used to support the cells contained in the containing cavity together; 3. The battery liquid cooling device according to claim 2.

4. upper end surfaces of the support beam, the first liquid cooling body, and the second liquid cooling body are all located at the same level; 4. The battery liquid cooling device according to claim 3.

5. the support beam and the first liquid cooling body both extend along a first direction, two support beams are provided, the two support beams are provided opposite each other along a second direction, a plurality of second liquid cooling bodies are provided, the first liquid cooling body is provided between two adjacent second liquid cooling bodies, and the first direction is perpendicular to the second direction.

5. The battery liquid cooling device according to claim 3, wherein the battery liquid cooling device is a cooling device for cooling a battery liquid.

6. a width of the first liquid cooling body is greater than twice the width of the support beam, the support beam is used to receive one row of the cells arranged in the first direction, and the first liquid cooling body is used to receive two sets of the cells arranged in the second direction; 6. The battery liquid cooling device according to claim 5.

7. the first liquid cooling body is disposed parallel to the support beam with a gap therebetween, the second liquid cooling body is located between the support beam and the first liquid cooling body, two second liquid cooling bodies are provided, and the first liquid cooling body is located at an intermediate position between the two support beams along the second direction, the first liquid cooling body constitutes approximately 10% of the cavity bottom area of ​​the accommodating cavity, and the second liquid cooling body constitutes approximately 90% of the cavity bottom area of ​​the accommodating cavity.

7. The battery liquid cooling device according to claim 6.

8. the first liquid cooling body is an extrusion; and / or the first liquid cooling body is welded to the support frame; and / or the second passage is press-formed inside the second liquid cooling body; 2. The battery liquid cooling device according to claim 1.

9. a liquid outlet is opened in the second liquid cooling body, and the liquid outlet is in communication with the second passage; a reflux port is opened in the first liquid cooling body, and the reflux port is in communication with the first passage, and the liquid outlet is in communication with the first passage; the battery liquid cooling device further includes a return pipe having both ends connected to the liquid outlet and the return port, respectively, and a flow direction of the cooling medium in the second passage is different from a flow direction of the cooling medium in the first passage; 2. The battery liquid cooling device according to claim 1.

10. A battery liquid cooling device comprising the battery liquid cooling device according to any one of claims 1 to 9. A battery pack characterized by:

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