Battery cell cooling device and battery pack

Abstract

The utility model provides a battery cell cooling device and a battery pack, the battery cell cooling device comprises a first liquid cooling structure, a second liquid cooling structure, a liquid inlet pipe and a shunt branch pipe, both the first liquid cooling structure and the second liquid cooling structure are internally provided with liquid runners, and the second liquid cooling structure and the first liquid cooling structure define a battery cell accommodating space; the liquid inlet pipe communicates with the second liquid cooling structure and is used for communicating with the first liquid cooling structure through the shunting branch pipes. The cooling device has the beneficial effect that the overall cooling effect of the battery cell can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell cooling device and a battery pack. Background Technology

[0002] To improve user experience, current vehicle battery systems have higher requirements for shortening charging time. At this time, the battery has a larger charging rate and generates more heat. Therefore, the battery cooling system needs to be matched with higher cooling efficiency to control the temperature of the battery cells within a suitable temperature range.

[0003] Currently, new energy vehicles primarily use liquid cooling to dissipate heat from battery cells. For example, a liquid cooling structure is installed at the bottom of the battery cell to transfer heat generated at the bottom of the cell during battery operation. However, liquid cooling systems often have a targeted cooling effect on individual cells, requiring heat conduction within the cell to lower the temperature of other areas, making it difficult to dissipate heat from other parts of the cell in a timely manner. Furthermore, in some vehicles, the battery cells are large, for example, quite tall, resulting in a long heat transfer path. This makes it difficult to lower the temperature of other parts of the cell, and also leads to uneven cooling, making it impossible to control the overall temperature of the cell. Utility Model Content

[0004] The present invention provides a cell cooling device and a battery pack, which can improve the technical problem of poor overall cooling effect of battery cells.

[0005] In a first aspect, embodiments of the present invention provide a battery cell cooling device, comprising:

[0006] The first liquid cooling structure and the second liquid cooling structure are provided with liquid flow channels inside the first liquid cooling structure and the second liquid cooling structure together form a cell housing space.

[0007] The inlet pipe and the branch pipe are connected to the second liquid cooling structure and to the first liquid cooling structure via the branch pipe.

[0008] In one embodiment, the inlet pipe is connected to the second liquid cooling structure, and the branch pipe is connected to the liquid flow channels of the first liquid cooling structure and the second liquid cooling structure respectively. The branch pipe is used to divert the coolant flowing into the second liquid cooling structure from the inlet pipe to the first liquid cooling structure.

[0009] In one embodiment, the cell cooling device further includes an outlet pipe and a confluence branch pipe. The outlet pipe is connected to the second liquid cooling structure, and the confluence branch pipe is connected to the liquid flow channels of the first liquid cooling structure and the second liquid cooling structure, respectively. The confluence branch pipe is used to merge the coolant in the first liquid cooling structure into the second liquid cooling structure so that it flows out through the outlet pipe.

[0010] In one embodiment, the first liquid cooling structure includes a first manifold, a second manifold, and multiple liquid cooling pipes. The first manifold is connected to the branch pipe, and the multiple liquid cooling pipes are spaced apart between the first manifold and the second manifold. The first manifold is connected to the second manifold through the multiple liquid cooling pipes.

[0011] In one embodiment, the first manifold includes a separate first flow channel portion and a second flow channel portion. The first flow channel portion is connected to the branch pipe, and both the first flow channel portion and the second flow channel portion are connected to the second manifold through multiple liquid cooling pipes.

[0012] In one embodiment, the first liquid cooling structure further includes a water-blocking structure, which is disposed in the first manifold and divides the liquid flow channel of the first manifold into a first flow channel portion and a second flow channel portion.

[0013] In one embodiment, the liquid cooling pipe is connected to the first manifold and the second manifold respectively through a bending structure, so that the bottom surfaces of the first manifold and the second manifold are offset relative to the bottom surface of the liquid cooling pipe in a first direction.

[0014] In one embodiment, at least one of the first manifold, the second manifold, and the liquid cooling pipe is a flat pipe.

[0015] In one embodiment, the length of the liquid flow channel of the first liquid cooling structure is less than the length of the liquid flow channel of the second liquid cooling structure; and / or the ratio of the flow rate of the liquid flow channel of the first liquid cooling structure to the flow rate of the liquid flow channel of the second liquid cooling structure is in the range of 0.6-0.7.

[0016] In one embodiment, the first liquid cooling structure includes a harmonica tube liquid cooling plate; and / or the second liquid cooling structure includes an extruded cold plate.

[0017] In one embodiment, the liquid flow channels of the first liquid cooling structure include parallel liquid flow channels; and / or the liquid flow channels of the second liquid cooling structure include series liquid flow channels.

[0018] Secondly, embodiments of the present invention provide a battery pack, including the cell cooling device described above.

[0019] In one embodiment, the battery pack further includes a battery cell disposed within the battery cell housing space of the battery cell cooling device. The battery cell's terminals are connected to an electrical connection structure, which is connected to a first liquid cooling structure of the battery cell cooling device via thermally conductive adhesive. The bottom of the battery cell is attached to a second liquid cooling structure of the battery cell cooling device.

[0020] In one embodiment, the battery pack further includes a bracket disposed between the battery cell and the first liquid cooling structure, and abutting against both the battery cell and the first liquid cooling structure.

[0021] In one embodiment, the bracket includes a plurality of support ribs, which form a receiving groove. The electrical connection structure and the thermally conductive adhesive are disposed within the receiving groove, and the support ribs abut against the battery cell and the first liquid cooling structure, respectively.

[0022] The beneficial effects of the embodiments of this utility model are as follows:

[0023] In this embodiment of the invention, a cell housing space is formed by the first and second liquid cooling structures. After the cell is installed, heat dissipation can be achieved at the bottom and top of the cell, increasing the liquid cooling area and effectively shortening the heat transfer distance, thereby improving the cycle life of the entire battery system. Simultaneously, the cooling process of the cell is faster and more even, allowing for better control of the overall cell temperature. Furthermore, the first and second liquid cooling structures are supplied with coolant through a unified inlet pipe. A branch pipe diverts a portion of the coolant to the first liquid cooling structure, allowing the inlet pipe to be supplied by a single coolant supply device. This reduces equipment costs, simplifies the piping, and facilitates coolant replenishment, replacement, and subsequent maintenance. During coolant supply, the flow rate and pressure can be rationally allocated according to the actual needs of the first and second liquid cooling structures, improving system stability during cell cooling. Centralized coolant supply also facilitates unified monitoring and adjustment of coolant parameters, ensuring that the service life of each liquid cooling structure and pipe is approximately the same, and facilitating centralized maintenance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of a battery cell cooling device provided in an embodiment of this utility model. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the overall structure of a battery cell cooling device provided in an embodiment of this utility model. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the overall structure of a battery cell cooling device provided in an embodiment of this utility model. Figure 3 The second liquid-cooled structure is shown in its cross-section.

[0028] Figure 4 This is a schematic diagram of the overall structure of a battery pack provided by an embodiment of this utility model;

[0029] Figure 5 yes Figure 4 Enlarged view of point M in the middle;

[0030] Figure 6 This is a schematic diagram of the overall structure of the first liquid cooling structure of a battery cell cooling device provided in an embodiment of this utility model;

[0031] Figure 7 This is a schematic diagram of the bottom structure of the first liquid cooling structure of a battery cell cooling device provided in an embodiment of this utility model;

[0032] Figure 8 This is a side view of the first liquid cooling structure of a battery cell cooling device provided in an embodiment of this utility model.

[0033] Figure 9 An overall structural schematic diagram of the second liquid cooling structure of a battery cell cooling device provided in an embodiment of this utility model;

[0034] Figure 10 This is a schematic diagram of the installation of a bracket in a battery pack according to an embodiment of the present invention. Figure 1 ;

[0035] Figure 11 This is a schematic diagram of the installation of a bracket in a battery pack according to an embodiment of the present invention. Figure 2 .

[0036] Explanation of reference numerals in the attached figures:

[0037] 100-First liquid cooling structure; 101-First manifold body; 101a-Inlet nozzle; 101b-Outlet nozzle; 102-Second manifold body; 103-Liquid cooling pipe; 104-Water blocking structure; 105-Bending structure; 111-First flow channel section; 121-Second flow channel section; 200-Second liquid cooling structure; 200a-Inlet pipe; 200b-Outlet pipe; 300-Cell housing space; 400-Branch branch pipe; 500-Combining branch pipe; 501-Electrical post; 600-Electrical connection structure; 700-Bracket; 701-Supporting rib; 711-Housing groove; 800-Cell; 801-Electrical post; 802-Explosion-proof valve; 900-Voltage acquisition terminal. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] According to a first aspect of this application, this application provides a battery cell cooling device; please refer to [link to relevant documentation]. Figures 1-4 As shown, Figure 1 This is a schematic diagram of the structure of a battery cell cooling device provided in one embodiment of this application, wherein, Figure 1 The middle arrow indicates the flow direction of coolant in a specific application scenario. Figure 2 This is a schematic diagram of another battery cell cooling device provided in one embodiment of this application. Figure 3 This is a schematic diagram of another battery cell cooling device provided in one embodiment of this application, wherein the second liquid cooling structure 200 is shown in cross-section. Figure 4 This is a schematic diagram of the structure of a battery pack including a modified cell cooling device, provided in one embodiment of this application.

[0040] The battery cell cooling device provided in this application includes a first liquid cooling structure 100, a second liquid cooling structure 200, an inlet pipe 200a, and a branch pipe 400. Both the first liquid cooling structure 100 and the second liquid cooling structure 200 are provided with liquid flow channels. The second liquid cooling structure 200 and the first liquid cooling structure 100 form a battery cell accommodating space 300. The inlet pipe 200a is connected to the second liquid cooling structure 200 and is used to connect to the first liquid cooling structure 100 through the branch pipe 400.

[0041] Reference Figures 1-3 As shown, in some embodiments, the first liquid cooling structure 100 and the second liquid cooling structure 200 can be arranged side by side with intervals, forming a cell housing space 300 between them. When the battery cell 800 is installed in the cell housing space 300, targeted heat dissipation can be achieved on the two opposite sides of the cell 800. Specifically, the bottom of the cell 800 can contact or connect with the top surface of the second liquid cooling structure 200, thereby achieving heat dissipation at the bottom of the cell 800. The top of the cell 800 can contact or connect with the bottom surface of the first liquid cooling structure 100, thereby achieving heat dissipation at the top of the cell 800. Thus, by cooling multiple parts of the cell 800 through two liquid cooling structures, the liquid cooling area is increased, effectively shortening the heat transfer distance and reducing the temperature of the top, bottom, and other parts of the cell during battery power supply and charging, especially during fast charging, thereby improving the cycle life of the entire battery system. Simultaneously, the cooling process of the cell 800 is faster and more even, allowing for better control of the overall cell temperature, which in turn facilitates vehicle charging and power supply control.

[0042] Meanwhile, in this embodiment of the battery cell cooling device, the first liquid cooling structure 100 and the second liquid cooling structure 200 are supplied with coolant through a unified inlet pipe 200a. A branch pipe 400 connects the inlet pipe and the first liquid cooling structure 100, diverting a portion of the coolant to the first liquid cooling structure. This allows the inlet pipe 200a to be supplied with coolant through a single coolant supply device, reducing equipment costs, simplifying piping, and facilitating coolant replenishment, replacement, and subsequent maintenance. Furthermore, during coolant supply, the flow rate and pressure can be rationally allocated according to the actual needs of the first and second liquid cooling structures 100 and 200, improving system stability during the cooling process of the battery cell 800. Centralized coolant supply also facilitates unified monitoring and adjustment of parameters such as coolant concentration and pH, ensuring that the service life of each liquid cooling structure and pipe is approximately the same, and facilitating centralized maintenance.

[0043] In some embodiments of this application, the inlet pipe 200a is connected to the second liquid cooling structure 200, and the branch pipe 400 is connected to the liquid flow channels of the first liquid cooling structure 100 and the second liquid cooling structure 200 respectively. The branch pipe 400 is used to divert the coolant flowing into the second liquid cooling structure 200 from the inlet pipe 200a to the first liquid cooling structure 100.

[0044] Reference Figures 1-4 As shown, in this embodiment, the inlet pipe 200a is specifically connected to the second liquid cooling structure 200, and the two ends of the branch pipe 400 are respectively connected to the first liquid cooling structure 100 and the second liquid cooling structure 200, thereby communicating with the liquid flow channels of the first liquid cooling structure 100 and the second liquid cooling structure 200. Thus, when the battery cell cooling device is used, by connecting the coolant supply device, such as connecting the liquid cooling pipeline of the whole vehicle, the coolant flows into the second liquid cooling structure 200 from the inlet pipe 200a, and then is diverted through the branch pipe 400. Part of the coolant continues to flow in the second liquid cooling structure 200, while part of the coolant enters the first liquid cooling structure 100, thereby achieving cooling of other parts of the battery cell 800 and achieving a more stable and faster heat dissipation and cooling effect.

[0045] The specific location where the coolant flows into the branch pipe 400 in the second liquid cooling structure 200 can be set according to actual needs.

[0046] In some embodiments of this application, the cell cooling device further includes an outlet pipe 200b and a confluence branch pipe 500. The outlet pipe 200b is connected to the second liquid cooling structure 200, and the confluence branch pipe 500 is connected to the liquid flow channels of the first liquid cooling structure 100 and the second liquid cooling structure 200, respectively. The confluence branch pipe 500 is used to merge the coolant in the first liquid cooling structure 100 into the second liquid cooling structure 200 so that it flows out through the outlet pipe 200b.

[0047] Reference Figures 1-4As shown, in this embodiment, the cell cooling device further includes an outlet pipe 200b and a confluence branch pipe 500 for the return flow of liquid from the first liquid cooling structure 100 and the second liquid cooling structure 200. The outlet pipe 200b is also connected to the second liquid cooling structure 200. Specifically, it can be located on the same side of the second liquid cooling structure 200 as the inlet pipe 200a to facilitate connection to external liquid cooling pipelines. The two ends of the confluence branch pipe 500 are respectively connected to the first liquid cooling structure 100 and the second liquid cooling structure 200, thereby communicating with the liquid flow channels of the first liquid cooling structure 100 and the second liquid cooling structure 200. In this way, the coolant of the first liquid cooling structure 100, after dissipating heat from the cell 800, flows into the second liquid cooling structure 200 through the confluence branch pipe 500 and merges with the coolant in the second liquid cooling structure 200, and then flows out through the outlet pipe 200b. Therefore, the overall structure and pipeline of the cell cooling device in this application are simpler and easier to maintain and manage.

[0048] Among them, the branch pipe 400 and the combined branch pipe 500 can be quick-release nylon pipes to facilitate disassembly and maintenance.

[0049] In some embodiments of this application, the first liquid cooling structure 100 includes a harmonica tube liquid cooling plate; and / or the second liquid cooling structure 200 includes an extruded cold plate.

[0050] Reference Figure 5 , Figure 6 and Figure 9 As shown, in this embodiment, the first liquid cooling structure 100 is a harmonica tube liquid cooling plate, which makes the overall structure lighter, uses less raw materials, and has a lower cost. Meanwhile, the tube body of the harmonica tube liquid cooling plate is connected to or adjacent to the top of the battery cell 800, ensuring heat dissipation. There are windows between the tube bodies without obstruction. Therefore, when installing the battery cell 800, the explosion-proof valve 802 of the battery cell 800 can be placed below this window, giving the battery cell 800 a larger pressure relief space and ensuring stable operation. The second liquid cooling structure 200 includes a squeeze-type cold plate, which fits against the bottom of the battery cell 800, ensuring better cooling and heat dissipation at the bottom of the battery cell 800.

[0051] In some embodiments of this application, the first liquid cooling structure 100 includes a first manifold 101, a second manifold 102, and multiple liquid cooling pipes 103. The first manifold 101 is connected to the branch pipe 400, and the multiple liquid cooling pipes 103 are spaced apart between the first manifold 101 and the second manifold 102. The first manifold 101 is connected to the second manifold 102 through the multiple liquid cooling pipes 103.

[0052] Reference Figure 6As shown, in this embodiment, a first liquid-cooling structure 100 in the form of a harmonica tube liquid-cooled plate includes a first manifold 101, a second manifold 102, and multiple liquid-cooling pipes 103. The first manifold 101 is connected to a branch pipe 400, specifically, it is detachably connected to the branch pipe 400 via an inlet nozzle 101a. Thus, after being diverted by the branch pipe 400, the coolant is introduced into the first manifold 101 through the inlet nozzle 101a. The first manifold 101 is connected to the second manifold 102 via multiple liquid-cooling pipes 103. The first manifold 101 is connected to the second manifold 102, thus enabling the flow channel to be open. The coolant in the first manifold 101 is then diverted through multiple liquid cooling pipes 103 and enters the second manifold 102. Based on the action of the first manifold 101, the multiple liquid cooling pipes 103, and the coolant in the second manifold 102, heat exchange is achieved on the top of the battery cell 800. For example, the multiple liquid cooling pipes 103 are connected to the terminal post 801 of the battery cell 800 through thermally conductive adhesive and electrical connection structure 600, achieving faster heat exchange and thus achieving a better heat dissipation and cooling effect.

[0053] Multiple liquid cooling pipes 103 are spaced apart between the first manifold 101 and the second manifold 102, allowing them to connect with multiple rows of battery cells 800 for heat dissipation. For example... Figure 4 The battery pack has three rows of cells 800, and each row of cells 800 is connected to two liquid cooling pipes 103 by thermally conductive adhesive and two rows of electrical connection structures 600. The spaced liquid cooling pipes 103 form windows, so that the explosion-proof valve 802 of the cell 800 can be located at the window, thereby facilitating pressure relief.

[0054] In some embodiments of this application, the liquid flow channels of the first liquid cooling structure 100 include parallel liquid flow channels; and / or the liquid flow channels of the second liquid cooling structure 200 include series liquid flow channels.

[0055] Reference Figure 1 As shown, in the first liquid cooling structure 100, at least a portion of the coolant in the multiple liquid cooling pipes 103 flows in the same direction, thus forming a parallel liquid flow channel. This achieves more uniform heat dissipation, facilitating more even distribution of coolant to different heat dissipation areas and reducing temperature differences within the battery pack. (Refer to...) Figure 9As shown, the arrows indicate the flow direction of the coolant in a specific application scenario. In this embodiment, the second liquid cooling structure 200 is a series liquid flow channel, which has a relatively simple structure and facilitates the control of parameters such as flow rate and temperature, enabling more accurate understanding and control of the coolant's heat dissipation. Furthermore, the coolant flow resistance of a parallel liquid flow channel is relatively low, while that of a series liquid flow channel is relatively high. Based on the combined series and parallel configuration, when the coolant is distributed through the branch pipe 400, the coolant flow rate in the liquid cooling channel of the second liquid cooling structure 200 can be increased, facilitating a reasonable distribution of coolant flow between the second liquid cooling structure 200 and the first liquid cooling structure 100. This results in a better cooling effect when cooling the bottom and top of the battery cell 800.

[0056] In some embodiments of this application, the first manifold 101 includes a separate first flow channel portion 111 and a second flow channel portion 121. The first flow channel portion 111 is connected to the branch pipe 400. Both the first flow channel portion 111 and the second flow channel portion 121 are connected to the second manifold 102 through multiple liquid cooling pipes 103.

[0057] Reference Figure 1 and Figure 7 As shown in the embodiment of this utility model, the first manifold 101 has two separate flow channel sections, both of which are connected to the second manifold 102 through multiple liquid cooling pipes 103. The first flow channel section 111 is connected to the branch pipe 400 through the inlet nozzle 101a. Thus, the coolant flowing out of the branch pipe 400 enters the first flow channel section 111 and is divided by multiple liquid cooling pipes 103 to form a parallel flow channel, and flows into the second manifold 102. The coolant accumulates in the second manifold 102 and flows back into the second flow channel section 121 of the first manifold 101 through multiple liquid cooling pipes 103, thus forming another parallel flow channel, thereby ensuring the heat dissipation effect of the top of the battery cell 800. The first manifold 101 can be equipped with an outlet nozzle 101b to connect with the second flow channel section 121 and the confluence branch pipe 500. Thus, the coolant in the second flow channel section 121 flows into the second liquid cooling structure 200 through the outlet nozzle 101b and the confluence branch pipe 500, and finally flows out from the outlet pipe 200b, achieving coolant return. This configuration, while forming multiple parallel flow channels to ensure heat dissipation and reduce flow resistance, allows coolant to flow in and out on the same side of the first liquid cooling structure 100, i.e., the inlet nozzle 101a and the outlet nozzle 101b are located on the same side of the first liquid cooling structure 100. Finally, the branch pipe 400 and the confluence branch pipe 500 can be located on the same side of the second liquid cooling structure 200, simplifying the internal piping and facilitating the connection and installation of external liquid cooling pipes.

[0058] In some embodiments of this application, the first liquid cooling structure 100 further includes a water blocking structure 104, which is disposed inside the first manifold 101 and divides the liquid flow channel of the first manifold 101 into a first flow channel portion 111 and a second flow channel portion 121.

[0059] Reference Figure 7 As shown, in this embodiment, by setting a water-blocking structure 104 in the first manifold 101, specifically, two water-blocking plates can be set to divide the liquid flow channel of the first manifold 101 into the first flow channel portion 111 and the second flow channel portion 121, thereby realizing the arrangement of parallel flow channels while ensuring that the liquid inlet and liquid outlet of the first liquid cooling structure 100 are located on the same side, which facilitates pipeline connection.

[0060] In some embodiments of this application, the liquid cooling pipe 103 is connected to the first manifold 101 and the second manifold 102 respectively through a bending structure 105, so that the bottom surfaces of the first manifold 101 and the second manifold 102 are offset relative to the bottom surface of the liquid cooling pipe 103 in a first direction.

[0061] Reference Figure 8 As shown, in this embodiment, the bending structure can specifically be a "Z"-shaped bending structure. Therefore, when connecting the first manifold 101 and the second manifold 102 to the liquid cooling pipe 103, the manifold and the liquid cooling pipe 103 can be aligned in the first direction, i.e. Figure 8 In an optional embodiment, the bottom surfaces of the first current collector 101 and the second current collector 102 are higher than the bottom surface of the liquid cooling pipe 103 in the first direction, thereby freeing up a certain amount of space at the bottom of the current collector to facilitate the routing of cables related to the battery cell 800, such as the routing of the CCS (Cells Contact System), making the internal structure of the battery pack more concise.

[0062] In some embodiments of this application, at least one of the first manifold 101, the second manifold 102, and the liquid cooling pipe 103 is a flat pipe.

[0063] In one specific embodiment, the liquid cooling pipe 103 is a flat tube to increase the heat exchange area. When the terminal post 801 of the battery cell 800 is connected through the thermally conductive adhesive and the electrical connection structure 600, the width of the liquid cooling pipe 103 can match the width of the electrical connection structure 600, such as the aluminum bar, to achieve better heat transfer and improve the cooling effect.

[0064] In some embodiments of this application, the length of the liquid flow channel of the first liquid cooling structure 100 is less than the length of the liquid flow channel of the second liquid cooling structure 200; and / or the ratio of the flow rate of the liquid flow channel of the first liquid cooling structure 100 to the flow rate of the liquid flow channel of the second liquid cooling structure 200 is in the range of 0.6-0.7.

[0065] In this embodiment, the second liquid cooling structure 200 has a longer liquid flow channel than the first liquid cooling structure 100. It can be understood that the length of the liquid flow channel refers to the overall length of the flow channel along the same liquid flow path. This results in greater frictional resistance of the coolant in the second liquid cooling structure 200. When the coolant is split through the branch pipe 400, the coolant flow rate in the liquid cooling channel of the second liquid cooling structure 200 can be increased, which facilitates the reasonable distribution of coolant flow rates in the second liquid cooling structure 200 and the first liquid cooling structure 100. When cooling the bottom and top of the battery cell 800, more coolant is ensured to dissipate heat to the bottom, achieving a better cooling effect.

[0066] In some embodiments, the ratio of the flow rate of the liquid channel of the first liquid cooling structure 100 to the flow rate of the liquid channel of the second liquid cooling structure 200 ranges from 0.6 to 0.7. Specifically, the ratio of the flow rate of the liquid channel of the first liquid cooling structure 100 to the flow rate of the liquid channel of the second liquid cooling structure 200 is 2:3, thereby achieving a better flow distribution.

[0067] In some embodiments, the number of bends in the liquid flow channels of the second liquid cooling structure 200 on the same liquid flow path is greater than the number of bends in the liquid flow channels of the first liquid cooling structure 100 on the same liquid flow path. This ensures that the local resistance of the coolant in the second liquid cooling structure 200 is greater, which facilitates the reasonable distribution of coolant flow rates in the second liquid cooling structure 200 and the first liquid cooling structure 100.

[0068] Specifically, refer to Figures 1-3 and Figure 9 As shown, each liquid flow channel of the first liquid cooling structure 100 is a U-shaped flow channel, and the second liquid cooling structure 200 has an M-shaped flow channel. This allows the friction resistance and local resistance of the second liquid cooling structure 200 to be relatively large, resulting in a larger coolant flow rate in the liquid cooling flow channel of the second liquid cooling structure 200. This achieves a reasonable distribution of coolant flow rate between the second liquid cooling structure 200 and the first liquid cooling structure 100, ensuring that more coolant dissipates heat to the bottom when cooling the bottom and top of the battery cell 800, thus achieving a better cooling effect.

[0069] According to a second aspect of this application, a battery pack is provided, including the cell cooling device as described above.

[0070] The battery pack of this application embodiment is applicable to vehicles, including but not limited to electric vehicles and hybrid vehicles, and is particularly well-suited for commercial vehicles with relatively large cell height dimensions (800). The battery pack of this application embodiment has the same or similar technical effects as the aforementioned cell cooling device, and will not be elaborated further here.

[0071] In some embodiments of this application, the battery pack further includes a battery cell 800, which is disposed within the battery cell housing space 300 of the battery cell cooling device. The terminal post 801 of the battery cell 800 is connected to an electrical connection structure 600, which is connected to the first liquid cooling structure 100 of the battery cell cooling device via thermally conductive adhesive. The bottom of the battery cell 800 is attached to the second liquid cooling structure 200 of the battery cell cooling device.

[0072] Reference Figure 1 As shown, in this embodiment, the first liquid cooling structure 100 and the second liquid cooling structure 200 are spaced apart in the vertical direction. The first liquid cooling structure 100 is a rectangular frame structure, and the second liquid cooling structure 200 is a rectangular flat plate structure. The battery cell 800 is installed in the battery cell housing space 300. The terminal 801 of the battery cell 800 is connected to the liquid cooling pipe 103 of the first liquid cooling structure 100 through the electrical connection structure 600, such as connecting aluminum bars, and thermal conductive adhesive. This allows the heat at the top of the battery cell 800 to be exchanged with the first liquid cooling structure 100 through the terminal 801, the electrical connection structure 600, and the thermal conductive adhesive during charging and discharging, thereby achieving rapid cooling of the top of the battery cell 800 and ultimately achieving rapid heat dissipation of the upper part of the battery cell 800. The bottom surface of the battery cell 800 is in contact with the surface of the second liquid cooling structure 200, and the heat at the bottom is directly exchanged with the second liquid cooling structure 200, thereby achieving rapid cooling of the bottom of the battery cell 800 and ultimately achieving rapid heat dissipation of the lower part of the battery cell 800. Thus, the cooperation between the first liquid cooling structure 100, the second liquid cooling structure 200, and the battery cell 800 achieves rapid heat dissipation, thereby improving the cycle life of the entire battery system and enhancing the user experience. Connecting the electrical connection structure 600 to the first liquid cooling structure 100 with thermally conductive adhesive prevents direct connection between the first liquid cooling structure 100 and the electrical connection structure 600, thus avoiding insulation failure.

[0073] Reference Figure 5 As shown, the top of the battery cell 800 is provided with an explosion-proof valve 802, which is located below the window formed between adjacent liquid cooling pipes 103 in the first liquid cooling structure 100, so that the explosion-proof valve 802 is unobstructed and has a larger pressure relief space.

[0074] In some embodiments of this application, the battery pack further includes a bracket 700, which is disposed between the battery cell 800 and the first liquid cooling structure 100, and abuts against the battery cell 800 and the first liquid cooling structure 100 respectively.

[0075] Reference Figure 3 , Figure 8 and Figure 9 As shown, in this embodiment, the battery pack also includes a bracket 700, which is disposed between the first liquid cooling structure 100 and the battery cell 800, and is used to abut against the top of the battery cell 800 and the bottom of the first liquid cooling structure 100, respectively, so as to achieve support and improve the stability of the battery pack structure. In particular, when the first liquid cooling structure 100 and the battery cell 800 are connected and fixed by injecting thermally conductive adhesive, it provides a better support effect during the pressing of the adhesive.

[0076] In some embodiments of this application, the bracket 700 includes a plurality of support ribs 701, the plurality of support ribs 701 forming a receiving groove 711, the electrical connection structure 600 and the thermally conductive adhesive being disposed within the receiving groove 711, and the support ribs 701 respectively abutting against the battery cell 800 and the first liquid cooling structure 100.

[0077] Reference Figure 10 and Figure 11 As shown, multiple support ribs 701 are arranged around to form a support portion of the bracket 700, located above a battery cell 800 and abutting against the battery cell 800 and the first liquid cooling structure 100 respectively, thereby providing a support effect. The multiple support ribs 701 form a receiving groove 711, which prevents overflow of thermally conductive adhesive during the injection process based on the limiting of the side walls of the support ribs 701, and reduces the amount of thermally conductive adhesive used.

[0078] The receiving groove 711 can accommodate thermally conductive adhesive and electrical connection structure 600, and can also be used to accommodate and install related wire harnesses and terminals, such as... Figure 10 and Figure 11 The voltage acquisition terminal 900 is shown.

[0079] In some specific embodiments, the bracket 700 can be made of plastic and also serve as a CCS bracket, so as to simultaneously provide connection support and insulation protection for CCS-related structures.

[0080] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An electric cell cooling device, characterized by, The application relates to a liquid cooling structure for a battery pack. The liquid cooling structure comprises a first liquid cooling structure (100) and a second liquid cooling structure (200), wherein the first liquid cooling structure (100) and the second liquid cooling structure (200) are internally provided with liquid flow channels, and the second liquid cooling structure (200) and the first liquid cooling structure (100) enclose a battery cell accommodating space (300). The liquid cooling structure further comprises an inlet pipe (200a) and a branch pipe (400), wherein the inlet pipe (200a) is connected with the second liquid cooling structure (200), and the branch pipe (400) is connected with the first liquid cooling structure (100) and the second liquid cooling structure (200) respectively.

2. The cell cooling device of claim 1, wherein, The branch pipe (400) is used for distributing the cooling liquid flowing into the second liquid cooling structure (200) from the inlet pipe (200a) to the first liquid cooling structure (100).

3. The cell cooling device of claim 1, wherein, The liquid cooling structure further comprises an outlet pipe (200b) and a merging pipe (500), wherein the outlet pipe (200b) is connected with the second liquid cooling structure (200), and the merging pipe (500) is connected with the first liquid cooling structure (100) and the second liquid cooling structure (200) respectively.

4. The cell cooling device of claim 1, wherein, The merging pipe (500) is used for merging the cooling liquid in the first liquid cooling structure (100) to the second liquid cooling structure (200) to flow out through the outlet pipe (200b).

5. The cell cooling device of claim 4, wherein, The first liquid cooling structure (100) comprises a first manifold body (101), a second manifold body (102) and a plurality of liquid cooling pipes (103), the first manifold body (101) is connected with the branch pipe (400), the plurality of liquid cooling pipes (103) are arranged at intervals between the first manifold body (101) and the second manifold body (102), and the first manifold body (101) is connected with the second manifold body (102) through the plurality of liquid cooling pipes (103).

6. The cell cooling device of claim 5, wherein, The first manifold body (101) comprises a first flow channel part (111) and a second flow channel part (121), the first flow channel part (111) is connected with the branch pipe (400), and the first flow channel part (111) and the second flow channel part (121) are connected with the second manifold body (102) through the plurality of liquid cooling pipes (103). The first liquid cooling structure (100) further comprises a water plugging structure (104), the water plugging structure (104) is arranged in the first manifold body (101) and separates the liquid flow channel of the first manifold body (101) into the first flow channel part (111) and the second flow channel part (121).

7. The cell cooling device of claim 4, wherein, The liquid cooling pipe (103) is connected with the first and second manifold bodies (101, 102) by bending structures (105) so that the bottom surfaces of the first and second manifold bodies (101, 102) are arranged in a first direction relative to the bottom surface of the liquid cooling pipe (103).

8. The cell cooling device of claim 4, wherein, At least one of the first and second manifold bodies (101, 102) and the liquid cooling pipe (103) is a flat pipe body.

9. The cell cooling device of any of claims 1-8, wherein, The length of the liquid flow channel of the first liquid cooling structure (100) is less than that of the second liquid cooling structure (200); and / or the ratio of the flow rate of the liquid flow channel of the first liquid cooling structure (100) to that of the second liquid cooling structure (200) ranges from 0.6 to 0.

7.

10. The cell cooling device according to any one of claims 1 to 8, characterized in that, The first liquid cooling structure (100) comprises a harmonica liquid cooling plate; and / or the second liquid cooling structure (200) comprises an extruded cooling plate.

11. The cell cooling device of any of claims 1-8, wherein, The liquid flow channel of the first liquid cooling structure (100) comprises a parallel liquid flow channel; and / or the liquid flow channel of the second liquid cooling structure (200) comprises a series liquid flow channel.

12. A battery pack, characterized by, The electric cell cooling device comprises the electric cell cooling device according to any one of claims 1-11.

13. The battery pack of claim 12, wherein, The electric cell (800) is arranged in the electric cell accommodating space (300) of the electric cell cooling device, the pole (801) of the electric cell (800) is connected with the electric connection structure (600), the electric connection structure is connected with the first liquid cooling structure (100) of the electric cell cooling device through the heat-conducting adhesive, and the bottom of the electric cell (800) is attached to the second liquid cooling structure (200) of the electric cell cooling device.

14. The battery pack of claim 13, wherein, The bracket (700) is arranged between the electric cell (800) and the first liquid cooling structure (100) and abuts against the electric cell (800) and the first liquid cooling structure (100) respectively.

15. The battery pack of claim 14, wherein, The bracket (700) comprises a plurality of support ribs (701), the plurality of support ribs (701) surround an accommodating groove (711), the electric connection structure (600) and the heat-conducting adhesive are arranged in the accommodating groove (711), and the support ribs (701) abut against the electric cell (800) and the first liquid cooling structure (100) respectively.

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