Battery liquid cooling device and battery pack

Abstract

A battery liquid cooling device (100), characterized in that it comprises: a support frame (10); a first liquid cooling element (20) arranged on the support frame (10) and defining a first channel (20a); and at least one second liquid cooling element (30), wherein for each of the at least one second liquid cooling element (30) two ends of the second liquid cooling element (30) are connected to the support frame (10) and the first liquid cooling element (20), respectively; the second liquid cooling element (30) defines a second channel (30a); the support frame (10), the first liquid cooling element (20) and the second liquid cooling element (30) enclose each other to form a receiving cavity with an upwardly directed opening; the receiving cavity is used to receive a cell; wherein a cooling medium circulates in the first channel (20a) of the first liquid cooling body (20) and in the second channel (30a) of the second liquid cooling body (30) to cool the cell recorded in the image; the strength of the first liquid cooling element (20) is greater than the strength of the second liquid cooling element (30); the first liquid cooling element (20) and the second liquid cooling element (30) are configured to support the cell received in the receiving cavity; when the cell is received in the receiving cavity, an overlap area between a projection of the cell in a vertical direction and a projection of the second liquid cooling body (30) in the vertical direction is larger than an overlap area between the projection of the cell in the vertical direction and a projection of the first liquid cooling body (20) in the vertical direction.

Description

Technical field

[0001] The present application relates to the technical field of batteries, and in particular to a battery liquid cooling device and a battery pack. State of the art

[0002] Cell-to-pack (CTP) is a module-free battery pack structure, meaning the cells are directly integrated into a battery pack, eliminating the need for a conventional battery module. This structure allows the battery pack to be directly integrated into a vehicle's floor panel, serving as part of the vehicle's structural components.

[0003] In the prior art, CTP has become a common battery pack configuration. With a square cell, an L-shaped rim support is arranged to support the cell and structurally combined with the shape of the square cell, resulting in a "simple support beam" that is stable and reliable. This simple support beam ensures that the entire battery pack can withstand high-frequency vibrations of 50 Hz and exhibits high strength.

[0004] Some manufacturers design the square cell by orienting one electrode pole of the cell upwards. Particularly with a small square cell, due to structural limitations, liquid cooling can only be located at the bottom of the cell. In this way, the cell is positioned above a liquid cooling plate. If space for the battery pack is limited, a crossbeam and a longitudinal beam cannot be positioned simultaneously. The liquid cooling plate can only serve as a "bottom plate," but the strength of the liquid cooling plate itself is insufficient, so this configuration limits the mechanical performance of a battery box. Content of the present application

[0005] The main purpose of the present application is to provide a battery liquid cooling device and a battery pack designed to improve the support strength of the battery liquid cooling device. 1. A battery liquid cooling device, characterized in that it comprises: a support frame; a first liquid cooling element arranged on the support frame and defining a first channel; and at least one second liquid cooling element, wherein for each of the at least one second liquid cooling element, two ends of the second liquid cooling element are connected to the support frame and the first liquid cooling element, respectively; the second liquid cooling element defines a second channel; the support frame, the first liquid cooling element, and the second liquid cooling element enclose each other to form a receiving cavity with an upwardly directed opening; the receiving cavity is used to receive a cell; wherein a cooling medium circulates in the first channel of the first liquid cooling element and in the second channel of the second liquid cooling element to cool the cell received in the receiving cavity;the strength of the first liquid cooling block is greater than the strength of the second liquid cooling block; the first liquid cooling block and the second liquid cooling block are configured to support the cell received in the receiving cavity; when the cell is received in the receiving cavity, an overlap area between a projection of the cell in a vertical direction and a projection of the second liquid cooling block in a vertical direction is greater than an overlap area between the projection of the cell in a vertical direction and a projection of the first liquid cooling block in a vertical direction.

[0006] In some embodiments, the support frame defines a first stepped slot, and the first liquid cooling element defines a second stepped slot; a slot bottom face of the first stepped slot is aligned with a slot bottom face of the second stepped slot; wherein an outer circumferential edge of each of the at least one second liquid cooling element is embedded in the first stepped slot and the second stepped slot.

[0007] In some embodiments, the support frame comprises: two support crossbeams and two support longitudinal beams, wherein the two support longitudinal beams are connected between the two support crossbeams and are each arranged on two opposite sides of the two support crossbeams; and at least one support beam connected to the two support crossbeams, wherein the at least one support beam and the first liquid cooling element are configured to support the cell received in the receiving cavity.

[0008] In some embodiments, the upper end faces of the at least one support beam, the first liquid cooling body and the at least one second liquid cooling body are located at the same horizontal height.

[0009] In some embodiments, the at least one support beam and the first liquid cooling element both extend along a first direction, wherein the number of the at least one support beam is two, the two support beams are arranged opposite each other along a second direction; the at least one second liquid cooling element comprises a plurality of second liquid cooling elements; the first liquid cooling element is arranged between two adjacent second liquid cooling elements; the first direction is perpendicular to the second direction.

[0010] In some embodiments, the width of the first liquid cooling element is greater than twice the width of each of the at least one support beam; one of the at least one support beam is configured to support a plurality of cells arranged in a row in the first direction; the first liquid cooling element is configured to support a plurality of cells arranged in two groups in the second direction.

[0011] In some embodiments, the first liquid cooling element and the at least one support beam are arranged parallel to each other and spaced apart; wherein the at least one second liquid cooling element is arranged between the at least one support beam and the first liquid cooling element; and the at least one second liquid cooling element comprises two second liquid cooling elements; the first liquid cooling element is arranged at a central position between the two support beams along the second direction; the first liquid cooling element forms substantially 10% of a floor area of ​​the receiving cavity, and the at least one second liquid cooling element forms substantially 90% of the floor area of ​​the receiving cavity.

[0012] In some embodiments, the first liquid cooling element is an extruded molded part; and / or the first liquid cooling element is connected to the support frame by welding; and / or the second channel is formed by punching an interior of the second liquid cooling element.

[0013] In some embodiments, the second liquid cooling element defines a liquid outlet that communicates with the second channel; wherein the first liquid cooling element defines a return port located next to the liquid outlet, the return port being connected to the first channel; the battery liquid cooling device further comprises a return line, wherein two ends of the return line are each connected to the liquid outlet and the return port; and the flow direction of the cooling medium in the second channel differs from the flow direction of the cooling medium in the first channel.

[0014] A battery pack that includes the battery liquid cooling device at the top.

[0015] The battery liquid cooling device proposed in the technical solution of the present application can solve the problem of the insufficient strength of the second liquid cooling element alone, when the overall installation space of the battery liquid cooling device is limited, by arranging the first liquid cooling element with a strength greater than that of the second liquid cooling element. The first liquid cooling element can provide sufficient support for the cells contained in the receiving cavity and thus ensure the overall mechanical performance of the battery liquid cooling device.

[0016] The first liquid cooling element is equipped with a first channel, and the second liquid cooling element is equipped with a second channel. Both the first and second channels can be used to channel the cooling medium, which dissipates heat from the cells contained within the receiving cavity. The second liquid cooling element is responsible for the primary heat dissipation, while the first liquid cooling element provides structural strength and a small amount of heat dissipation to the cells, sufficient to meet the heat dissipation requirements of the cells contained within the receiving cavity. By ensuring adequate heat dissipation, the safety of the battery's liquid cooling system is improved, and the safety risk posed by insufficient strength of the second liquid cooling element is reduced. Brief description of the drawing

[0017] To more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, a brief description of the drawings required for describing the embodiments or the prior art follows. Naturally, the drawings described below represent only some embodiments of the present application. A person skilled in the art can, without having to perform any creative work, also create other drawings based on the structure shown in these drawings. Fig. Figure 1 is a composite schematic view of a battery liquid cooling device according to an embodiment of the present application. Fig. Figure 2 is a structural schematic view of a battery liquid cooling device according to an embodiment of the present application. Fig. 3 is a structural schematic view of the in Fig. 2 shown battery liquid cooling device, viewed from a different angle. Fig. 4 is a cross-sectional view of the in Fig. 3 shown battery liquid cooling device, which was recorded along a line CC. Fig. 5 is an enlarged view of one in Fig. 4 shown in section D. Fig. 6 is an exploded view of the in Fig. 2 shown battery liquid cooling device. Fig. 7 is another exploded view of the in Fig. 2 shown battery liquid cooling device.

[0018] In the drawings: 100, Battery liquid cooling device; 10, Support frame; 11, First stepped slot; 12, Support cross member; 13, Support longitudinal member; 14, Support beam; 13a, Liquid supply opening; 13b, Discharge opening; 20, First liquid cooling element; 20a, First channel; 20b, Return opening; 20c, Drain connection; 21, Second stepped slot; 30, Second liquid cooling element; 30a, Second channel; 30b, Liquid outlet; 30c, Liquid inlet; 40, Return line; 200, cell.

[0019] The implementation of the purpose, the functional features, and the advantages of the present application are further illustrated with reference to the attached drawings in the context of the embodiments. Detailed description of the embodiments

[0020] The following description of the technical solution in the embodiments of the present application is presented clearly and completely with reference to the accompanying drawings of the embodiments of the present application. It is obvious that the described embodiments are only some of the embodiments of the present application, but not all. The following description of at least one exemplary embodiment serves only for illustrative purposes and does not in any way restrict the present application, its application, or use. Based on the embodiments in the present application, all other embodiments that could be obtained by a person skilled in the art without creative effort fall within the scope of protection of the present application.

[0021] References in this text to "elaborations" or "implementations" mean that certain features, structures, or properties described in connection with an embodiment or implementation may be included in at least one embodiment of the present application. The occurrence of the term in different places in the description does not necessarily refer to the same embodiment and does not exclude other embodiments or independent or alternative embodiments. It is expressly assumed, and implicitly understood by the person skilled in the art, that the embodiments described herein may be combined with other embodiments.

[0022] "Cell To Pack (CTP)" is a module-free battery pack structure, meaning the cells are directly integrated into a battery pack, eliminating the need for a conventional battery module. This structure allows the battery pack to be directly integrated into a vehicle's floor panel, serving as part of the vehicle's structural components.

[0023] Some manufacturers offer a small, square cell with one electrode pole facing upwards. Structural limitations are evident, as liquid cooling can only be applied to the bottom of the cell. This design places the cell above a liquid cooling plate. While heat dissipation is ensured, it introduces some defects.

[0024] If space in the battery pack is limited, a crossbeam and a longitudinal beam cannot be arranged simultaneously; the liquid cooling plate can only serve as a "base plate," but the strength of the liquid cooling plate itself is insufficient, and therefore this configuration has a limitation on the mechanical performance of the battery pack.

[0025] As in the Fig. As shown in Figures 1 to 5, the present embodiment provides a battery liquid cooling device 100 comprising a support frame 10, a first liquid cooling element 20, and a second liquid cooling element 30. It is understood that the battery liquid cooling device 100 can be arranged in a battery pack or that the battery pack contains the battery liquid cooling device 100.

[0026] In the present embodiment, the support frame 10 is made of an aluminum alloy, and the aluminum alloy support frame 10 is lightweight yet possesses a certain degree of strength. The aluminum alloy support frame 10 can be easily machined and formed into a desired shape. The support frame 10 is a rectangular frame and can provide a stable mounting space, thereby facilitating the arrangement of the square cell 200 within it.

[0027] The first liquid cooling element 20 is mounted on the support frame 10 and is an extruded component. Extrusion ensures that the first liquid cooling element 20 has a uniform wall thickness and stable mechanical performance. The wall thickness of the first liquid cooling element 20 is greater than that of the second liquid cooling element 30. The first liquid cooling element 20 is welded to the support frame 10, preferably using friction stir welding. This improves the strength and corrosion resistance of the connection between the first liquid cooling element 20 and the support frame 10.Compared to the second liquid cooling element 30, the first liquid cooling element 20 has greater strength and is configured to support the cell 200 housed in a receiving cavity. This ensures that the cell 200 is not easily deformed or damaged when subjected to an external force, thus improving the structural stability of the entire support frame 10. In this way, the cell 200 can be stably inserted into the support frame 10, and performance can be maintained even when the battery pack is used in a dynamic environment. The first liquid cooling element 20 has a cavity formed by extrusion and forming, and this cavity directly defines a first channel 20a through which a cooling medium flows.The first channel 20a can be used in combination with a second channel 30a of the second liquid cooling sink 30, thereby increasing the flow path of the cooling medium and creating a larger heat dissipation area.

[0028] Two ends of the second liquid cooling element 30 are connected to the support frame 10 and the first liquid cooling element 20, respectively. The second liquid cooling element 30 can be made of an aluminum material with high thermal conductivity. The second liquid cooling element 30 defines the second channel 30a, and the second liquid cooling element 30 utilizes the second channel 30a to dissipate heat from the cell 200. The second channel 30a extends along a longitudinal direction of the second liquid cooling element 30 and is bent to form a Z-shape. The second channel 30a can be formed by punching an inner surface of the second liquid cooling element 30. Punching to form a one-piece structure with the second liquid cooling element 30 allows for the easy creation of a channel in any complex shape. The Z-shaped second channel 30a increases the heat dissipation area of ​​the cooling medium.The flow path of the cooling medium in the channel is enlarged to increase heat dissipation efficiency. In the present embodiment, the second liquid cooling element 30, for adaptation to the rectangular support frame 10, comprises a second liquid cooling plate and a thermally conductive structural adhesive arranged on the second liquid cooling plate. The second liquid cooling plate consists of a flat plate. One side of the second liquid cooling plate, which has a large surface area, faces the cell 200. By keeping the overall height of the battery liquid cooling device 100 constant, the heat dissipation area is maximized and the vertical space requirement is reduced. The thermally conductive structural adhesive has ideal thermal conductivity and can conduct heat from the cell 200 to the second liquid cooling plate, thereby improving heat dissipation efficiency.

[0029] The support frame 10, the first liquid cooling element 20, and the second liquid cooling element 30 enclose each other to form a receiving cavity with an upward-facing opening. The receiving cavity accommodates the cell 200, with the first liquid cooling element 20 and the second liquid cooling element 30 being configured to support the cell 200 held within the receiving cavity. The cooling medium circulates in the first channel 20a of the first liquid cooling element 20 and the second channel 30a of the second liquid cooling element 30 to cool the cell 200 held within the receiving cavity.

[0030] When the cell 200 is received in the receiving cavity, the overlap area between a vertical projection of the cell 200 and a vertical projection of the second liquid cooling element 30 is larger than the overlap area between the vertical projection of the cell 200 and a vertical projection of the first liquid cooling element 20. This allows the second liquid cooling element 30 to dissipate heat more efficiently. While the first liquid cooling element 20 supports the cell, it also assists in heat dissipation. The heat dissipation requirements of the cell 200 are thus met, and at the same time, the first liquid cooling element 20 is positioned to enhance the rigidity of the cell 200's mounting.The safety of the battery liquid cooling device 100 is improved, and safety risks caused by the second liquid cooling body 30 with insufficient strength are reduced.

[0031] In practice, the space formed by the support frame 10, the first liquid cooling sink 20, and the second liquid cooling sink 30 allows the electrode pole of the cell 200 to be placed upwards, i.e. vertically, or the electrode pole of the cell 200 to be placed in a right-left direction, i.e., the cell is lying downwards, which is not restricted by the present application.

[0032] In some embodiments, the support frame 10 defines a first stepped slot 11, and the first liquid cooling element 20 defines a second stepped slot 21. A slot bottom face of the first stepped slot 11 is aligned with a slot bottom face of the second stepped slot 21. An outer circumferential edge of the second liquid cooling element 30 is embedded in the first stepped slot 11 and the second stepped slot, so that the second liquid cooling element does not tilt after being embedded. Furthermore, the second liquid cooling element 30 is prevented from shifting due to vibrations or shocks, thereby improving the overall safety of the battery liquid cooling device 100.By defining the first stepped slot 11 and the second stepped slot 21, the second liquid cooling sink 30 can be stably connected to the support frame 10 and the first liquid cooling sink 20, which improves the structural stability.

[0033] As in Fig. As shown in Figure 6, in some embodiments the second liquid cooling element 30 defines a liquid outlet 30b that is connected to the second channel 30a. The first liquid cooling element 20 has a return opening 20b located next to the liquid outlet 30b. The return opening 20b is connected to the first channel 20a. The battery liquid cooling device 100 further comprises a return line 40. Two ends of the return line 40 are each connected to the liquid outlet 30b and the return opening 20b, respectively. The flow direction of the cooling medium in the second channel 30a differs from the flow direction of the cooling medium in the first channel 20a. By defining the liquid outlet 30b, the return opening 20b, and the return line 40, the cooling medium can effectively circulate between the second liquid cooling body 30 and the first liquid cooling body 20.The first channel 20a, defined by the cavity of the first liquid cooling sink 20, can serve as a return channel, thus improving the heat dissipation efficiency of the entire battery pack.

[0034] The support frame 10 further defines a liquid supply port 13a and a discharge port 13b. A side of the second liquid cooling element 30 opposite the liquid outlet 30b defines a liquid inlet 30c, which is connected to the liquid supply port 13a. A side of the first liquid cooling element 20 opposite the return port 20b defines a drain port 20c, which is connected to the discharge port 13b. The cooling medium flows through the liquid supply port 13a into the second liquid cooling element 30, and the cooling medium is discharged from the first liquid cooling element 20 through the discharge port 13b. The liquid supply port 13a and the discharge port 13b are located on the same side of the support frame 10. The arrangement of the cooling piping is simplified, and assembly and maintenance can be carried out easily.

[0035] Specifically, the liquid outlet 30b and the liquid inlet 30c are both defined in an upper end face of the second liquid cooling body 30, and the return port 20b and the drain port 20c are both defined in an upper end face of the first liquid cooling body 20. The liquid inlet 30c and the liquid supply port 13a are arranged side by side to allow the cooling medium to enter the second liquid cooling body 30 smoothly. The drain port 20c and the discharge port 13b are arranged side by side so that the cooling medium can be discharged after circulation is complete. Since the inlet and outlet paths for the cooling medium are clear and direct, potential points of failure are reduced and the reliability of the cooling medium flow path is improved.

[0036] Understandably, in the present embodiment, the second channel 30a of the second liquid cooling element 30 is used as an inlet flow channel and the first channel 20a of the first liquid cooling element 20 as a return flow channel. Of course, the second channel 30a of the second liquid cooling element 30 can also serve as a return flow channel and the first channel 20a of the first liquid cooling element 20 as an inlet flow channel. The present application does not restrict the functions of the channels.

[0037] As in Fig. As shown in Figure 7, the support frame 10 in some embodiments comprises two crossbeams 12 and two longitudinal support beams 13, as well as a support beam 14. The two longitudinal support beams 13 are connected between the two crossbeams 12 and arranged on two opposite sides of the two crossbeams 12, resulting in a stable support structure. The support beam 14 is connected to the two crossbeams 12. The support beam 14 and the first liquid cooling element 20 support two ends of the cell 200, which is received in the receiving cavity, thus significantly improving the structural stability of the support frame 10, reducing the risk of damage to the cell 200 due to vibrations or shocks, and improving the overall safety of the support frame 10.When the cell 200 is arranged in the receiving cavity, the two ends of the cell 200 are each supported by the support beam 14 and the first liquid cooling sink 20, the gravity of the cell 200 is distributed more evenly, a localized pressure exerted on the cell 200 is reduced, thus reducing the risk of damage to the cell 200.

[0038] The support beam 14 and the support crossbeams 12 are configured as a single-piece and integral structure, which improves the integrity of the support frame 10, reduces the stress concentration at the connection points, and decreases the formation of fatigue cracks, thus improving the durability of the support frame 10 and improving the structural integrity.

[0039] The support beam 14 is located, in particular, at the junction between the crossbeams 12 and the longitudinal support beams 13. The support beam 14 serves as an additional support structure and interacts with the crossbeams 12 and the longitudinal support beams 13, thereby improving the stability of the entire support frame 10 and reducing the space required inside the support frame 10. In this way, the battery pack configuration is more compact, the weight of the cell 200 can be supported and distributed more effectively, potential external impacts can be distributed more effectively, and local stress concentrations are reduced.

[0040] In some embodiments, the upper end faces of the support beam 14, the first liquid cooling element 20, and the second liquid cooling element 30 are at the same horizontal height. This means that along the vertical direction, the end face of the support beam 14 is flush with the end face of the first liquid cooling element 20. The end faces of the support beam 14 and the first liquid cooling element 20 are used to make contact with the cell 200, ensuring that the support beam 14 and the first liquid cooling element 20 support both ends of the cell 200 and thus ensuring that both ends of the cell 200 are subjected to a uniform force. Deformation or damage to the cell 200 due to unequal support is prevented.The rigidity of the entire battery liquid cooling device 100 is improved, and the decrease in load-bearing capacity caused by structural deformation is reduced. Furthermore, the alignment of the surfaces simplifies the assembly process of the cell 200 by ensuring that the cell 200 is correctly positioned in a predetermined location and preventing slippage within the receiving cavity.

[0041] As in Fig.As shown in Figure 2, the support beam 14 and the first liquid cooling element 20 both extend along a first direction AA. Two support beams 14 are arranged. The two support beams 14 are arranged opposite each other in a second direction BB. The two support beams are parallel to each other and spaced apart. It is understood that if the support frame 10 is rectangular, the support beams 14 and the first liquid cooling element 20 both extend along a longitudinal direction of the support frame 10, and the two support beams 14 are arranged opposite each other along a transverse direction of the support frame 10. The support beams 14 are configured to provide uniform support in order to reduce the effect of vibration on the cell 200 in the vertical direction.A multitude of secondary liquid cooling elements 30 are arranged to optimally absorb the heat generated by the cell 200. The heat dissipation by the secondary liquid cooling element 30 improves the heat dissipation performance of the entire battery pack. A primary liquid cooling element 20 is arranged between the two adjacent secondary liquid cooling elements 30. That is, each of the two sides of the secondary liquid cooling element, along the width direction of the support frame 10, abuts a primary liquid cooling element. The primary liquid cooling element is arranged between a support beam 14 and a primary liquid cooling element 20, adjacent to the support beam 14. The support beam 14 abuts the primary liquid cooling element.The arrangement of the support beams 14, the second liquid cooling sink 30, and the first liquid cooling sink 20 fully utilizes the space of the support frame 10, allowing the first liquid cooling sink 20 to provide additional support and heat dissipation for the cell 200 and ensuring the structural compactness of the battery liquid cooling device 100. The first direction AA is perpendicular to the second direction BB.

[0042] It is understandable that, depending on practical use, the length and width of the support frame 10 can be increased and the number of the first liquid cooling sinks adjusted to adapt the support frame 10 to different sizes and shapes, so that more cells 200 can be accommodated.

[0043] In some embodiments, an intermediate rib is arranged in the first liquid cooling element 20. The intermediate rib divides the cavity into a first cavity and a second cavity. The intermediate rib increases the strength of the first liquid cooling element 20 and improves its stability when subjected to external loads. Furthermore, the first cavity and the second channel 30a of the second liquid cooling element 30, which is arranged opposite the first, can be shared; and the second cavity and the second channel 30a of another second liquid cooling element 30, which is arranged opposite the first, can also be shared.

[0044] In particular, a plurality of liquid inlets 30c, corresponding to the plurality of second liquid cooling elements 30, are all connected to the liquid supply port 13a. Similarly, when a plurality of first liquid cooling elements 20 are arranged, a plurality of outlet ports 20c, corresponding to the plurality of first liquid cooling elements 20, are all connected to the discharge port 13b. Since the plurality of liquid inlets 30c and the plurality of outlet ports 20c each share a liquid supply port 13a and a discharge port 13b, a single connection point is required for maintenance and replacement. This reduces maintenance effort and simplifies the arrangement of the piping for the coolant flow paths. It ensures that the coolant flows in a specific sequence and that heat is effectively dissipated.The number of pipe connections is reduced. Therefore, blockages and leaks in the pipes are reduced.

[0045] In some embodiments, the width of the first liquid cooling element 20 is greater than twice the width of the support beam 14. The support beam 14 is configured to support a plurality of cells 200 arranged in a row in the first direction AA, such that the plurality of cells 200 are closely spaced in a longitudinal direction and are uniformly supported by the support beam 14. The first liquid cooling element 20 is configured to support a plurality of cells 200 arranged in two groups in the second direction BB. Increasing the width of the first liquid cooling element 20 simultaneously provides a sufficient heat dissipation area for the two groups of cells 200 in the transverse direction, while maintaining the compactness of the battery liquid cooling device 100.

[0046] In some embodiments, the first liquid cooling element 20 and the support beam 14 are arranged parallel to each other and spaced apart. The second liquid cooling element 30 is arranged between the support beam 14 and the first liquid cooling element 20. There are two second liquid cooling elements 30. The first liquid cooling element 20 is positioned centrally between the two support beams 14 along the second direction BB and ensures a uniform cooling effect for the two groups of cells 200 supported by the first liquid cooling element 20. The heat dissipation effect is improved.

[0047] The second liquid cooling element 30 comprises approximately 90% of the floor area of ​​the receiving chamber and ensures heat dissipation from the main areas of the cells 200. The first liquid cooling element 20 comprises approximately 10% of the floor area of ​​the receiving chamber. In this way, the battery liquid cooling system 100 has a compact structure, and the liquid cooling elements do not occupy excessive space. The aforementioned surface area distribution ensures maximum heat dissipation efficiency in a limited space while simultaneously guaranteeing the structural compactness and stability of the cells 200.

[0048] The foregoing is only a partial embodiment of the present application and does not limit the scope of the patent for the present application. Any equivalent structural transformation that makes use of the content of the description and drawings of the present application, or that is applied directly or indirectly in other related technical fields, in accordance with the inventive concept of the present application, is included within the scope of patent protection of the present application.

Claims

[1] A battery liquid cooling device (100), characterized in that it comprises: a support frame (10); a first liquid cooling body (20) arranged on the support frame (10) and defining a first channel (20a); and at least one second liquid cooling body (30), wherein for each of the at least one second liquid cooling body (30), two ends of the second liquid cooling body (30) are each connected to the support frame (10) and the first liquid cooling body (20); the second liquid cooling body (30) defines a second channel (30a); the support frame (10), the first liquid cooling body (20), and the second liquid cooling body (30) enclose each other to form a receiving cavity with an upwardly directed opening; the receiving cavity is used to receive a cell; wherein a cooling medium circulates in the first channel (20a) of the first liquid cooling body (20) and in the second channel (30a) of the second liquid cooling body (30) in order to cool the cell accommodated in the receptacle; the strength of the first liquid cooling body (20) is greater than the strength of the second liquid cooling body (30); the first liquid cooling body (20) and the second liquid cooling body (30) are configured to support the cell received in the receiving cavity; when the cell is received in the receiving cavity, an overlap area between a projection of the cell in a vertical direction and a projection of the second liquid cooling body (30) in the vertical direction is larger than an overlap area between the projection of the cell in the vertical direction and a projection of the first liquid cooling body (20) in the vertical direction. [2] The battery liquid cooling device according to claim 1, wherein the support frame (10) defines a first stepped slot (11), and the first liquid cooling body (20) defines a second stepped slot (21); a slot bottom surface of the first stepped slot (11) is aligned with a slot bottom surface of the second stepped slot (21); and an outer peripheral edge of each of the at least one second liquid cooling body (30) is embedded in the first stepped slot (11) and the second stepped slot (21). [3] Battery liquid cooling device according to claim 2, wherein the support frame (10) comprises: two support cross members (12) and two support longitudinal members (13), wherein the two support longitudinal members (13) are connected between the two support cross members (12) and are each arranged on two opposite sides of the two support cross members (12); and at least one support beam (14) connected to the two support cross beams (12), wherein the at least one support beam (14) and the first liquid cooling body (20) are configured to support the cell received in the receiving cavity. [4] Battery liquid cooling device according to claim 3, wherein the upper end surfaces of the at least one support beam (14), the first liquid cooling body (20) and the at least one second liquid cooling body (30) are at the same horizontal height. [5] Battery liquid cooling device according to claim 3 or 4, wherein the at least one support beam (14) and the first liquid cooling body (20) both extend along a first direction, the number of the at least one support beam (14) is two, the two support beams (14) are arranged opposite each other along a second direction; the at least one second liquid cooling body (30) comprises a plurality of second liquid cooling bodies; the first liquid cooling body (20) is arranged between two adjacent ones of the plurality of second liquid cooling bodies; the first direction is perpendicular to the second direction. [6] The battery liquid cooling device according to claim 5, wherein a width of the first liquid cooling body (20) is greater than twice a width of each of the at least one support beam (14); one of the at least one support beam (14) is configured to support a plurality of cells arranged in a row in the first direction; the first liquid cooling body (20) is configured to support a plurality of cells arranged in two groups in the second direction. [7] The battery liquid cooling device according to claim 6, wherein the first liquid cooling body (20) and the at least one support beam (14) are arranged parallel to each other and spaced apart from each other; the at least one second liquid cooling body (30) is arranged between the at least one support beam (14) and the first liquid cooling body (20); and the at least one second liquid cooling body (30) comprises two second liquid cooling bodies; the first liquid cooling body (20) is arranged at a middle position between the two support beams (14) along the second direction; the first liquid cooling body (20) forms substantially 10% of a bottom area of ​​the receiving cavity, and the at least one second liquid cooling body (30) forms substantially 90% of the bottom area of ​​the receiving cavity. [8] Battery liquid cooling device according to claim 1, wherein the first liquid cooling body (20) is an extruded molded part; and / or the first liquid cooling body (20) is connected to the support frame (10) by welding; and / or the second channel (30a) is formed by punching an interior of the second liquid cooling body (30). [9] The battery liquid cooling device according to claim 1, wherein the second liquid cooling body (30) defines a liquid outlet (30b) communicating with the second channel (30a); the first liquid cooling body (20) defines a return opening (20b) arranged adjacent to the liquid outlet (30b), the return opening (20b) communicating with the first channel (20a); the battery liquid cooling device further comprises a return line (40), two ends of the return line (40) respectively communicating with the liquid outlet (30b) and the return opening (20b); a flow direction of the cooling medium in the second channel (30a) is different from a flow direction of the cooling medium in the first channel (20a). [10] A battery pack comprising the battery liquid cooling device according to any one of claims 1 to 9.

Images