Battery cell cooling device and battery pack

Abstract

Provided in the present application are 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 flow distribution branch pipe, wherein both the first liquid cooling structure and the second liquid cooling structure are provided with liquid flow channels therein, and the second liquid cooling structure and the first liquid cooling structure enclose a battery cell accommodating space; and the liquid inlet pipe is in communication with the second liquid cooling structure and is configured to communicate with the first liquid cooling structure through the flow distribution branch pipe.

Description

Cell cooling device and battery pack

[0001] This application claims priority to Chinese patent applications filed on February 24, 2025, with application numbers 202510206976.2 and 202520301298.3, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a cell cooling device and a battery pack. Background Technology

[0003] 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.

[0004] 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 the battery cell, requiring heat conduction within the cell to lower the temperature of other areas, and cannot effectively dissipate heat from other parts of the cell in a timely manner. Invention Overview

[0005] In some vehicles, the battery cells are large, for example, tall. In this case, the heat transfer path is long. On the one hand, it is difficult to lower the temperature of other parts of the battery cell. On the other hand, the cooling of the battery cell is uneven, making it impossible to control the overall temperature of the battery cell.

[0006] This application provides a battery cell cooling device, including: a first liquid cooling structure and a second liquid cooling structure, both of which have liquid flow channels inside, and the second liquid cooling structure and the first liquid cooling structure enclosing a battery cell housing space; an inlet pipe and a branch pipe, the inlet pipe being connected to the second liquid cooling structure, and the branch pipe being used to connect to the first liquid cooling structure.

[0007] This application also provides a battery pack, including the cell cooling device as described above. Beneficial effects

[0008] The battery cell cooling device provided in this application forms a battery cell housing space through a first liquid cooling structure and a second liquid cooling structure. After the battery cell is installed, it can dissipate heat from 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 battery cell is rapid and even, thus enabling control of the overall temperature of the battery cell. 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 through a single coolant supply device, reducing equipment costs, simplifying piping, and facilitating 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 the battery cell cooling process. Moreover, centralized coolant supply facilitates unified monitoring and adjustment of various coolant parameters, ensuring that the service life of each liquid cooling structure and pipeline is approximately the same, and facilitating centralized maintenance.

[0009] The battery pack provided in this application can improve the overall cooling effect by adopting the cell cooling device described above. Attached Figure Description

[0010] Figure 1 is a schematic diagram of the overall structure of a battery cell cooling device provided in an embodiment of this application;

[0011] Figure 2 is a schematic diagram of the overall structure of a battery cell cooling device provided in an embodiment of this application;

[0012] Figure 3 is a schematic diagram of the overall structure of a battery cell cooling device provided in an embodiment of this application, wherein the second liquid cooling structure is shown in cross-section;

[0013] Figure 4 is a schematic diagram of the overall structure of a battery pack provided in an embodiment of this application;

[0014] Figure 5 is an enlarged schematic diagram of point M in Figure 4;

[0015] Figure 6 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 application;

[0016] Figure 7 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 application;

[0017] Figure 8 is a side view of the first liquid cooling structure of a battery cell cooling device provided in an embodiment of this application;

[0018] Figure 9 is a schematic diagram of the overall structure of the second liquid cooling structure of a battery cell cooling device provided in an embodiment of this application;

[0019] Figure 10 is a schematic diagram of the installation of a bracket in a battery pack according to an embodiment of this application;

[0020] Figure 11 is a schematic diagram of the installation of a bracket in a battery pack according to an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. First liquid cooling structure; 101. First manifold; 101a. Inlet nozzle; 101b. Outlet nozzle; 102. Second manifold; 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 pipe; 500. Merging pipe; 501. Terminal; 600. Electrical connection structure; 700. Bracket; 701. Support rib; 711. Housing groove; 800. Cell; 801. Terminal; 802. Explosion-proof valve; 900. Voltage acquisition terminal. Embodiments of the present invention

[0023] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. "Above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature. Additionally, the terms "first" and "second" are used for descriptive distinction and have no specific meaning.

[0024] According to a first aspect of this application, this application provides a cell cooling device. Please refer to Figures 1-4. Figure 1 is a structural schematic diagram of a cell cooling device provided in one embodiment of this application, wherein the arrow in Figure 1 indicates the flow direction of the coolant in a specific application scenario. Figure 2 is a structural schematic diagram of another cell cooling device provided in one embodiment of this application. Figure 3 is a structural schematic diagram of yet another cell cooling device provided in one embodiment of this application, wherein the second liquid cooling structure 200 shows its cross-section. Figure 4 is a structural schematic diagram of a battery pack including the modified cell cooling device provided in one embodiment of this application.

[0025] 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.

[0026] Referring to Figures 1-3, 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 to achieve heat dissipation at the bottom of the cell 800, and the top of the cell 800 can contact or connect with the bottom surface of the first liquid cooling structure 100 to achieve heat dissipation at the top of the cell 800. Thus, multiple parts of the cell 800 are cooled by the two liquid cooling structures, thereby increasing the liquid cooling area, effectively shortening the heat transfer distance, reducing the temperature of the top, bottom and other parts of the cell during battery power supply and charging, especially during fast charging, and thus improving the cycle life of the entire battery system. Meanwhile, the cooling process of the 800 battery cell is rapid and even, which enables control of the overall temperature of the battery cell, thereby facilitating vehicle charging and power supply control.

[0027] 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.

[0028] 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.

[0029] Referring to Figures 1-4, 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 stable and rapid heat dissipation and cooling effect.

[0030] 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.

[0031] 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 can flow out through the outlet pipe 200b.

[0032] Referring to Figures 1-4, 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 relatively simple, facilitating maintenance and management.

[0033] Among them, the branch pipe 400 and the combined branch pipe 500 can be quick-release nylon pipes to facilitate disassembly and maintenance.

[0034] 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.

[0035] Referring to Figures 5, 6, and 9, in this embodiment, the first liquid cooling structure 100 is a harmonica tube liquid cooling plate. This design results in a lighter overall structure, uses fewer raw materials, and has a lower cost. Furthermore, 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 these windows, providing the battery cell 800 with a large pressure relief space and ensuring stable operation. The second liquid cooling structure 200 includes a squeeze-type cold plate, which fits snugly against the bottom of the battery cell 800, ensuring good cooling and heat dissipation for the bottom of the battery cell 800.

[0036] 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.

[0037] Referring to Figure 6, a first liquid-cooled structure 100 in the form of a harmonica tube liquid-cooled plate in this embodiment includes a first manifold 101, a second manifold 102, and multiple liquid-cooled 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 the multiple liquid-cooled pipes 103. The manifold 102 is connected, thus enabling flow channel conduction. The coolant in the first manifold 101 is 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 to achieve rapid heat exchange and thus achieve a good heat dissipation and cooling effect.

[0038] Multiple liquid cooling pipes 103 are spaced apart between the first current collector 101 and the second current collector 102, allowing them to connect to multiple rows of battery cells 800 for heat dissipation. For example, the battery pack in Figure 4 has three rows of battery cells 800, and each row of battery cells 800 is connected to two liquid cooling pipes 103 via thermally conductive adhesive and two rows of electrical connection structures 600. The spaced-apart liquid cooling pipes 103 form windows, allowing the explosion-proof valve 802 of the battery cell 800 to be located at these windows for easy pressure relief.

[0039] 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.

[0040] Referring to Figure 1, at least a portion of the coolant in the multiple liquid cooling pipes 103 of the first liquid cooling structure 100 flows in the same direction, forming a parallel liquid flow channel. This achieves uniform heat dissipation, facilitating the even distribution of coolant to different heat dissipation areas and reducing temperature differences within the battery pack. Referring to Figure 9, where the arrows indicate the coolant flow direction in a specific application scenario, in this embodiment, the second liquid cooling structure 200 is a series liquid flow channel. Its structure is relatively simple, facilitating the control of parameters such as flow rate and temperature, and enabling more accurate monitoring and control of coolant heat dissipation. In addition, the coolant flow resistance of the parallel liquid flow channel is relatively small, while the coolant flow resistance of the series liquid flow channel is relatively large. Based on the combination of 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 larger, which facilitates the reasonable distribution of coolant flow rate between the second liquid cooling structure 200 and the first liquid cooling structure 100, and achieves excellent cooling effect when cooling the bottom and top of the battery cell 800.

[0041] 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.

[0042] Referring to Figures 1 and 7, in this embodiment of the application, the first manifold 101 has two separate flow channel sections, both of which are connected to the second manifold 102 via multiple liquid cooling pipes 103. The first flow channel section 111 is connected to the branch pipe 400 via an inlet nozzle 101a. Thus, the coolant flowing out of the branch pipe 400 enters the first flow channel section 111 and is diverted by the 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 via the multiple liquid cooling pipes 103, similarly forming a parallel flow channel at the other end, thereby ensuring the heat dissipation effect at 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.

[0043] 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.

[0044] Referring to FIG7, 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.

[0045] 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.

[0046] Referring to Figure 8, in this embodiment, the bending structure can specifically be a "Z"-shaped bending structure. In this way, when the first current collector 101 and the second current collector 102 are connected to the liquid cooling pipe 103, the current collector and the liquid cooling pipe 103 can be misaligned in the first direction, that is, in the x direction in Figure 8. Specifically, in an optional embodiment, the bottom surface of the first current collector 101 and the second current collector 102 is higher than the bottom surface of the liquid cooling pipe 103 in the first direction, thereby freeing up a certain space at the bottom of the current collector, which facilitates the routing of the related cables of the battery cell 800, such as the routing of the CCS (Cells Contact System), making the internal structure of the battery pack more concise.

[0047] 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.

[0048] 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 a good heat transfer effect and improve the cooling effect.

[0049] 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.

[0050] 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 a larger friction 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 is larger, 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, it ensures that the coolant dissipates heat to the bottom, achieving a good cooling effect.

[0051] 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 more optimal flow distribution.

[0052] 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.

[0053] Specifically, referring to Figures 1-3 and 9, 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 rates between the second liquid cooling structure 200 and the first liquid cooling structure 100, ensuring that the coolant dissipates heat to the bottom when cooling the bottom and top of the battery cell 800, thus achieving a good cooling effect.

[0054] According to a second aspect of this application, a battery pack is provided, including the cell cooling device as described above.

[0055] 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.

[0056] 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.

[0057] Referring to Figure 1, 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 thermally 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 thermally 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.

[0058] Referring to Figure 5, the top of the battery cell 800 is provided with an explosion-proof valve 802. The explosion-proof valve 802 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 large pressure relief space.

[0059] 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.

[0060] Referring to Figures 3, 8, and 9, in this embodiment, the battery pack further includes a bracket 700. The bracket 700 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, thereby providing support and improving 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 process.

[0061] 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 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.

[0062] Referring to Figures 10 and 11, a plurality of 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 plurality of 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 sidewalls of the support ribs 701, and reduces the amount of thermally conductive adhesive used.

[0063] 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 voltage acquisition terminal 900 as shown in Figures 10 and 11.

[0064] 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.

Claims

1. A battery cell cooling device, comprising: The first liquid cooling structure (100) and the second liquid cooling structure (200) are provided with liquid flow channels inside the first liquid cooling structure (100) and the second liquid cooling structure (200). The second liquid cooling structure (200) and the first liquid cooling structure (100) form a cell housing space (300). The inlet pipe (200a) and the branch pipe (400) are connected to the second liquid cooling structure (200) and to the first liquid cooling structure (100) via the branch pipe (400).

2. The cell cooling device according to claim 1, wherein, 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).

3. The cell cooling device according to claim 1 or 2 further includes an outlet pipe (200b) and a confluence branch pipe (500), wherein 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, and 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 as to flow out through the outlet pipe (200b).

4. The cell cooling device according to any one of claims 1-3, wherein, 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).

5. The cell cooling device according to claim 4, wherein, 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).

6. The cell cooling device according to claim 5, wherein, The first liquid cooling structure (100) further includes a water blocking structure (104), which is disposed in the first manifold (101) and divides the liquid flow channel of the first manifold (101) into the first flow channel portion (111) and the second flow channel portion (121).

7. The cell cooling device according to any one of claims 4-6, wherein, 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.

8. The cell cooling device according to any one of claims 4-7, wherein, At least one of the first manifold (101), the second manifold (102), and the liquid cooling pipe (103) is a flat pipe.

9. The cell cooling device according to any one of claims 1-8, wherein, 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).

10. The cell cooling device according to any one of claims 1-9, wherein, 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 in the range of 0.6-0.

7.

11. The cell cooling device according to any one of claims 1-10, wherein, The number of bends in the liquid flow channel of the second liquid cooling structure (200) on the same liquid flow path is greater than the number of bends in the liquid flow channel of the first liquid cooling structure (100) on the same liquid flow path.

12. The cell cooling device according to any one of claims 1-11, wherein, 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.

13. The cell cooling device according to any one of claims 1-12, wherein, 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.

14. A battery pack comprising a cell cooling device as described in any one of claims 1-13.

15. The battery pack according to claim 14 further includes a battery cell (800), the battery cell (800) being disposed within the battery cell housing space (300) of the battery cell cooling device, the terminal (801) of the battery cell (800) being connected to an electrical connection structure (600), the electrical connection structure being connected to a first liquid cooling structure (100) of the battery cell cooling device via thermally conductive adhesive, and the bottom of the battery cell (800) being attached to a second liquid cooling structure (200) of the battery cell cooling device.

16. The battery pack according to claim 15, wherein, An explosion-proof valve (802) is provided on the top of the battery cell (800), and the explosion-proof valve (802) is located below the window formed between adjacent liquid cooling pipes (103) in the first liquid cooling structure (100).

17. The battery pack according to claim 15 or 16 further includes a bracket (700) disposed between the battery cell (800) and the first liquid cooling structure (100), and abutting against the battery cell (800) and the first liquid cooling structure (100) respectively.

18. The battery pack according to claim 17, wherein, 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 are disposed in the receiving groove (711), and the support ribs (701) abut against the battery cell (800) and the first liquid cooling structure (100) respectively.

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