Cooling plate structure, cooling device and battery pack assembly

Abstract

This utility model provides a cooling plate structure, a cooling device, and a battery pack assembly. The cooling plate structure includes a liquid-cooled plate unit for heat exchange contact with the battery cells of the battery pack. By providing a bent cooling channel for the flow of cooling medium within the liquid-cooled plate unit, and an inlet and outlet communicating with the cooling channel, and by having multiple additional channels within the liquid-cooled plate unit, these additional channels are spaced apart along the direction from the inlet to the outlet, and each additional channel is connected to the cooling channel. This allows external cooling medium to flow into the cooling channel and additional channels through the inlet, thereby exchanging heat with the battery cells during its flow within the cooling channel and additional channels, thus cooling the battery cells. The cooling medium finally flows out through the outlet, effectively increasing the heat exchange contact area between the cooling medium within the liquid-cooled plate unit and the battery cells, thereby improving the heat dissipation efficiency of the battery cells.

Description

Technical Field

[0001] This application relates to the field of battery cooling technology, and in particular to a cooling plate structure, a cooling device, and a battery pack assembly. Background Technology

[0002] A battery pack is a unit that combines multiple individual battery cells (such as lithium-ion batteries, nickel-metal hydride batteries, etc.) through specific electrical connections and structural designs to meet the energy storage and supply needs of specific equipment or systems.

[0003] Battery packs generate a significant amount of heat during operation, necessitating timely heat dissipation to prevent overheating and ensure proper functioning. To address this, battery packs are typically equipped with liquid cooling plates. A cooling medium flows within the cooling channels of the liquid cooling plate, exchanging heat with the individual battery cells to achieve heat dissipation and cooling of the battery pack.

[0004] However, current liquid cooling plates cannot achieve efficient heat dissipation of the battery pack, and therefore cannot meet practical needs. Utility Model Content

[0005] The purpose of this application is to provide a cooling plate structure, a cooling device, and a battery pack assembly, aiming to solve the problem of how to achieve efficient heat dissipation of the battery pack.

[0006] In a first aspect, embodiments of this application provide a cooling plate structure, including a liquid cooling plate unit, wherein the liquid cooling plate unit is used for heat exchange contact with the battery cells of the battery pack;

[0007] The liquid-cooled plate unit has a tortuous cooling channel for the flow of cooling medium, and an inlet and an outlet communicating with the cooling channel. The liquid-cooled plate unit also has multiple additional channels, which are spaced apart along the direction from the inlet to the outlet. At least one end of each additional channel is connected to the cooling channel, so that external cooling medium can flow into the cooling channel and the additional channels through the inlet, exchange heat with the battery cell, and then flow out through the outlet.

[0008] In some embodiments, the inner diameter of the cooling channel gradually decreases in the direction from the inlet to the outlet.

[0009] In some embodiments, the central axis of the additional flow channel is inclined relative to the central axis of the cooling flow channel.

[0010] In some embodiments, all of the additional flow channels are tilted in the same direction;

[0011] Alternatively, in the direction of flow of the cooling medium, at least a portion of the central axis of the additional flow channel is inclined toward a direction away from the cooling flow channel.

[0012] In some embodiments, the additional flow channel is tilted at an angle ranging from 30 degrees to 60 degrees relative to the cooling flow channel.

[0013] In some embodiments, additional channels are provided on both sides of the cooling channel along the width direction of the cooling channel, and the additional channels on both sides of the cooling channel are symmetrically arranged with respect to the cooling channel.

[0014] And / or, the inner wall of the additional flow channel is provided with a hydrophobic coating;

[0015] And / or, the inner wall of the cooling channel is provided with a hydrophobic coating;

[0016] And / or, all of the additional flow channels are evenly spaced along the extension direction of the cooling flow channels;

[0017] And / or, the side of the liquid cooling plate unit facing the battery cell is provided with a heat-conducting structure;

[0018] And / or, the additional flow channel is a straight flow channel or a curved flow channel.

[0019] Secondly, embodiments of this application also provide a cooling device, including at least two cooling plate structures, a negative pressure structure, an inlet manifold, and an outlet manifold;

[0020] At least two liquid-cooled plate units are used to alternately arrange with the battery cells;

[0021] One end of the liquid inlet manifold has a liquid inlet port for external cooling medium to flow in. The liquid inlet manifold is connected to the liquid inlets of all the liquid cooling plate units. The negative pressure structure is provided in the liquid inlet manifold to transport the external cooling medium into the liquid inlet manifold under the negative pressure of the negative pressure structure.

[0022] One end of the liquid outlet manifold has a liquid outlet port for discharging the cooling medium. The liquid outlet manifold is connected to the liquid outlet ports of all the liquid-cooled plate units, so that the external cooling medium can flow into each of the cooling channels through the liquid inlet port, exchange heat with the battery cells in the additional channels, and then be discharged through the liquid outlet port and the liquid outlet manifold port.

[0023] In some embodiments, the cooling device further includes a protective housing having a protective cavity, and the cooling plate structure is located within the protective cavity.

[0024] In some embodiments, the outer periphery of the liquid cooling plate unit is provided with a sealing groove, and a sealing element is provided in the sealing groove, the sealing element being sealed and fitted to the inner wall of the protective housing;

[0025] And / or, the protective housing includes an inner housing and an outer housing disposed outside the inner housing, and a thermally conductive and insulating structure is provided between the inner housing and the outer housing;

[0026] And / or, the cooling device further includes a controller and a temperature sensor, the controller being electrically connected to the temperature sensor and the negative pressure structure respectively, the temperature sensor being used to detect the real-time temperature information of the battery cell, and the controller being used to control the working state of the negative pressure structure according to the real-time temperature information.

[0027] Thirdly, embodiments of this application also provide a battery pack assembly, including a battery pack and a cooling device or cooling plate structure.

[0028] The beneficial effects of this utility model are:

[0029] This utility model provides a cooling plate structure, a cooling device, and a battery pack assembly. The cooling plate structure includes a liquid-cooled plate unit for heat exchange contact with the battery cells of the battery pack. By providing a bent cooling channel for the flow of cooling medium, and an inlet and an outlet communicating with the cooling channel, and by having multiple additional channels within the liquid-cooled plate unit, the additional channels are spaced apart along the direction from the inlet to the outlet, with at least one end of each additional channel communicating with the cooling channel, allowing external cooling medium to flow into the cooling channel and additional channels through the inlet. During its flow within the cooling channel and additional channels, the medium exchanges heat with the battery cells, thereby cooling the battery cells. The cooling medium finally flows out through the outlet. In other words, the cooling plate structure of this utility model embodiment, in addition to allowing the cooling medium to flow in the cooling channel to exchange heat with the battery cell, also allows the cooling medium to flow through multiple additional channels connected to the cooling channel. This can effectively increase the flow path and flow area of ​​the cooling medium in the liquid cooling plate cell, thereby increasing the heat exchange contact area with the battery cell and effectively improving the heat dissipation efficiency of the battery cell. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1This is an assembly drawing of the battery pack assembly shown in the embodiment of this application;

[0032] Figure 2 for Figure 1 An exploded view of the battery pack assembly shown.

[0033] Figure 3 for Figure 1 Schematic cross-section of the battery pack assembly shown Figure 1 ;

[0034] Figure 4 for Figure 1 Schematic cross-section of the battery pack assembly shown Figure 2 ;

[0035] Figure 5 for Figure 1 Schematic cross-section of the battery pack assembly shown Figure 3 ;

[0036] Figure 6 This is a schematic diagram of the circuit structure of the cooling device shown in the embodiment of this application.

[0037] Figure label:

[0038] 100. Liquid cooling plate unit; 110. Cooling channel; 120. Liquid inlet; 130. Liquid outlet; 140. Additional channel; 150. Hydrophobic coating; 160. Thermally conductive structure; 170. Sealing groove; 180. Seal; 200. Battery pack; 210. Battery cell; 300. Negative pressure structure; 400. Liquid inlet manifold; 410. Liquid inlet port; 500. Liquid outlet manifold; 510. Liquid outlet port; 600. Protective housing; 610. Inner housing; 620. Outer housing; 630. Thermally conductive and insulating structure; 700. Controller; 800. Temperature sensor. Detailed Implementation

[0039] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0040] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0041] Reference Figures 2 to 5 As shown in the figure, this application embodiment provides a cooling plate structure, including a liquid cooling plate unit 100, which is used for heat exchange contact with the battery cells 210 of the battery pack 200.

[0042] The liquid-cooled plate unit 100 has a bent cooling channel 110 for the flow of cooling medium, and an inlet 120 and an outlet 130 communicating with the cooling channel 110. The liquid-cooled plate unit 100 has a plurality of additional channels 140, which are arranged at intervals along the direction from the inlet 120 to the outlet 130. At least one end of each additional channel 140 is connected to the cooling channel 110, so that external cooling medium can flow into the cooling channel 110 and the additional channels 140 through the inlet 120, and then flow out through the outlet 130 after heat exchange contact with the battery unit 210.

[0043] In practice, the liquid cooling plate unit 100 can be attached to the side of the battery cell 210, so that the cooling medium can make heat exchange contact with the battery cell 210 during the flow of the cooling channel 110 and the auxiliary channel 140 of the liquid cooling plate unit 100. This allows the heat of the battery cell 210 to be transferred to the cooling medium, and then the heat is carried away by the cooling medium, thereby achieving heat dissipation and cooling of the battery cell 210.

[0044] In this embodiment, in addition to the cooling channel 110, the liquid cooling plate unit 100 is also provided with a plurality of additional channels 140. At least one end of the plurality of additional channels 140 is connected to the cooling channel 110, so that the cooling medium can enter each additional channel 140 during the flow of the cooling channel 110. This can increase the flow path and flow area of ​​the cooling medium, thereby increasing the heat exchange contact area between the liquid cooling plate unit 100 and the battery unit 210, and thus effectively improving the heat dissipation efficiency of the battery unit 210.

[0045] For example, the cooling medium can be cooling water or cooling oil.

[0046] For example, one end of the additional flow channel 140 can be connected to the cooling flow channel 110, or both ends of the additional flow channel 140 can be connected to different positions along the length of the cooling flow channel 110, which makes it easier for the cooling medium entering the additional flow channel 140 to flow back into the cooling flow channel 110.

[0047] For example, refer to Figure 4 As shown, the cooling channel 110 can be S-shaped to form a longer cooling channel 110 in a limited space, thereby increasing the heat exchange contact area and effectively improving heat dissipation efficiency.

[0048] In addition, in order to ensure that the cooling medium can flow smoothly along the cooling channel 110 and eventually flow out from the outlet 130, the inner diameter of the cooling channel 110 can be set to be larger than the inner diameter of the auxiliary channel 140. The specific ratio of the inner diameters of the two can be set according to actual needs.

[0049] In addition, the bent cooling channel 110 can effectively increase the extension length of the cooling channel 110 within a limited space, thereby increasing the flow path of the cooling medium and effectively improving heat dissipation efficiency.

[0050] The cooling plate structure of this embodiment includes a liquid-cooled plate unit 100, which is used for heat exchange contact with the battery cells 210 of the battery pack 200. The liquid-cooled plate unit 100 is provided with a cooling channel 110 for the flow of cooling medium, and an inlet 120 and an outlet 130 communicating with the cooling channel 110. The liquid-cooled plate also has multiple auxiliary channels 140, which are spaced apart along the direction from the inlet 120 to the outlet 130, and each auxiliary channel 140 is connected to the cooling channel 110. This allows external cooling medium to flow into the cooling channel 110 and auxiliary channels 140 through the inlet 120, thereby exchanging heat with the battery cells 210 during its flow within the cooling channel 110 and auxiliary channels 140, thus cooling the battery cells 210. The cooling medium finally flows out through the outlet 130. In other words, the cooling plate structure of this utility model embodiment, in addition to allowing the cooling medium to flow in the cooling channel 110 to exchange heat with the battery cell 210, also allows the cooling medium to flow through multiple additional channels 140 connected to the cooling channel 110. This can effectively increase the flow path and flow area of ​​the cooling medium in the liquid cooling plate cell 100, thereby increasing the heat exchange contact area between the cooling medium and the battery cell 210, and effectively improving the heat dissipation efficiency of the battery cell 210.

[0051] Reference Figure 4As shown, in some embodiments, the inner diameter of the cooling channel 110 gradually decreases along the direction from the inlet 120 to the outlet 130, thereby accelerating the flow rate of the cooling medium at the end of the cooling channel 110 and effectively improving the heat exchange efficiency.

[0052] Alternatively, in other implementations, the inner diameter of the liquid inlet 120 of the cooling channel 110 can be set to be larger than the diameter of the liquid outlet 130 of the cooling channel 110, which can also accelerate the flow rate of the cooling medium.

[0053] Reference Figure 4 As shown, in some embodiments, the central axis of the additional flow channel 140 is inclined relative to the central axis of the cooling flow channel 110. This arrangement allows for the arrangement of more additional flow channels 140 using the gaps between adjacent cooling flow channels 110, thereby further improving the utilization rate of the heat dissipation area.

[0054] Reference Figure 4 As shown, in some embodiments, all additional flow channels 140 are tilted in the same direction to facilitate manufacturing and to make the arrangement of the additional flow channels 140 more regular.

[0055] Alternatively, in some embodiments, at least a portion of the central axis of the additional flow channel 140 is inclined toward a direction away from the cooling flow channel 110 in the direction of the cooling medium flow. That is, the central axis of a portion of the additional flow channel 140 is set at an obtuse angle to the central axis of the cooling flow channel 110. This makes it easier for the cooling medium to flow smoothly into the additional flow channel 140, so as to make full use of the additional flow channel 140 to increase the heat exchange contact area.

[0056] In some embodiments, the tilt angle of the additional flow channel 140 relative to the cooling flow channel 110 ranges from 30 degrees to 60 degrees.

[0057] By reasonably setting the tilt angle of the additional flow channel 140 relative to the cooling flow channel 110, more additional flow channels 140 can be arranged using the gap between adjacent cooling flow channels 110, so as to further improve the utilization rate of the heat dissipation area. At the same time, it can ensure that the cooling medium can flow smoothly into the additional flow channel 140 to improve the heat exchange contact area.

[0058] For example, the tilt angle of the additional flow channel 140 relative to the cooling flow channel 110 can be 30°, or it can be 45° or it can be 60°.

[0059] Reference Figure 4 As shown, in some embodiments, along the width direction of the cooling channel 110 (refer to...) Figure 4Along the y-direction (as shown), auxiliary channels 140 are provided on both sides of the cooling channel 110. The auxiliary channels 140 on both sides of the cooling channel 110 are symmetrically arranged relative to the cooling channel 110 to make full use of the space on both sides of the width of the cooling channel 110, thereby further increasing the utilization rate of the heat dissipation area. Moreover, the symmetrical arrangement of the auxiliary channels 140 facilitates processing and manufacturing and makes the overall structure more regular and aesthetically pleasing.

[0060] In some embodiments, the inner wall of the additional flow channel 140 is provided with a hydrophobic coating 150, which makes the flow of the cooling medium in the additional flow channel 140 smoother, thereby reducing the flow resistance of the cooling medium, improving the stability of the cooling effect and the impact resistance of the additional flow channel 140, and thus also improving the service life of the cooling plate structure.

[0061] In some embodiments, the inner wall of the cooling channel 110 is provided with a hydrophobic coating 150, which makes the flow of the cooling medium in the cooling channel 110 smoother, thereby reducing the flow resistance of the cooling medium, improving the stability of the cooling effect and the impact resistance of the cooling channel 110, and thus also improving the service life of the cooling plate structure.

[0062] Reference Figure 4 As shown, in some embodiments, all additional flow channels 140 are evenly spaced along the extension direction of the cooling flow channel 110 to improve the uniformity of cooling and heat dissipation effect at various locations of the battery cell 210.

[0063] Reference Figure 2 and Figure 5 As shown, in some embodiments, a heat-conducting structure 160 is provided on the side of the liquid cooling plate unit 100 facing the battery unit 210, and the heat-conducting structure 160 is disposed in close contact with the side wall of the battery unit 210.

[0064] In use, the heat-conducting structure 160 is attached to the side plate of the battery cell 210, and then the liquid cooling plate cell 100 is inserted. The heat-conducting structure 160 fills the gap between the battery cell 210 and the liquid cooling plate cell 100, thereby improving the heat conduction efficiency.

[0065] For example, the thermally conductive structure 160 can be a thermally conductive silicone pad or a thermally conductive graphite.

[0066] Reference Figure 4 As shown, in some embodiments, the additional flow channel 140 is a straight flow channel, which facilitates manufacturing and allows for smooth flow of the cooling medium. Alternatively, in other implementations, the additional flow channel 140 may be a curved flow channel, so as to form a longer path of the additional flow channel 140 in a limited space, thereby increasing the heat exchange contact area and effectively improving heat dissipation efficiency.

[0067] Reference Figures 1 to 6 As shown, in some embodiments, this application also provides a cooling device, including at least two cooling plate structures, a negative pressure structure 300, an inlet manifold 400, and an outlet manifold 500;

[0068] At least two liquid-cooled plate units 100 are arranged alternately with battery units 210. One end of the liquid inlet manifold 400 has a liquid inlet port 410 for external cooling medium to flow in. The liquid inlet manifold 400 is connected to the liquid inlets 120 of all liquid-cooled plate units 100. A negative pressure structure 300 is provided in the liquid inlet manifold 400 to transport external cooling medium into the liquid inlet manifold 400 under the negative pressure of the negative pressure structure 300. One end of the liquid outlet manifold 500 has a liquid outlet port 510 for cooling medium to discharge. The liquid outlet manifold 500 is connected to the liquid outlet ports 130 of all liquid-cooled plate units 100, so that external cooling medium can flow into each cooling channel 110 through the liquid inlet port 410 and the liquid inlet port 120 to exchange heat with the battery units 210 and then be discharged through the liquid outlet port 130 and the liquid outlet port 510.

[0069] The specific structure and implementation principle of the cooling plate structure in this embodiment are the same as those of the cooling plate structure provided in the above embodiments, and can bring the same or similar technical effects. They will not be described in detail here, but can be referred to the description of the above embodiments.

[0070] In use, the battery cells 210, liquid-cooled plate cells 100, and battery cells 210 can be installed in an alternating arrangement. Additionally, the inlet manifold 400 and outlet manifold 500 can be connected to the heat exchange platform. By activating the negative pressure structure 300, the cooling medium is circulated and pumped into the inlet manifold 400. The inlet manifold 400 distributes the cooling medium into each inlet 120. The cooling medium flows within the cooling channels 110 and auxiliary channels 140 of each liquid-cooled plate cell 100 and finally collects at the outlet 130 before being discharged through the outlet manifold 500. During the flow, the cooling medium enters the auxiliary channels 140 on the side within the cooling channels 110, thereby increasing the flow area on the liquid-cooled plate cell 100 and improving heat dissipation efficiency.

[0071] For example, the negative pressure structure 300 can be a circulating pump or a negative pressure piston structure, etc.

[0072] Reference Figures 1 to 5 As shown, in some embodiments, the cooling device further includes a protective housing 600 having a protective cavity, and the cooling plate structure is located inside the protective cavity.

[0073] In practice, by setting up a protective shell 600 with anti-slip cavity to accommodate the cooling plate structure, the cooling plate structure can be effectively protected against impacts and dust.

[0074] For example, the protective housing 600 can be a plastic housing.

[0075] Reference Figure 5 As shown, in some embodiments, the outer periphery of the liquid cooling plate unit 100 is provided with a sealing groove 170, and a sealing element 180 is provided in the sealing groove 170. The sealing element 180 is sealed and fitted with the inner wall of the protective shell 600 to achieve a seal between the two, so as to effectively prevent the cooling plate structure from leaking.

[0076] For example, the seal 180 can be a sealing ring. The sealing groove 170 can be an O-ring.

[0077] Reference Figure 3 and Figure 4 As shown, in some embodiments, the protective housing 600 includes an inner housing 610 and an outer housing 620 disposed outside the inner housing 610, and a thermally conductive insulating structure 630 is provided between the inner housing 610 and the outer housing 620.

[0078] The protective housing 600 features a double-layer design, with a thermally conductive insulating structure 630 sandwiched between its inner walls. In practical use, the battery cell 210 is housed within the protective housing 600 for protection. The double-layer design of the protective housing 600 provides greater strength, resulting in more stable protection for the battery cell 210. Furthermore, the thermally conductive insulating structure 630 further enhances its strength while ensuring more stable heat dissipation.

[0079] For example, the thermally conductive insulating structure 630 can be a thermally conductive insulating resin or a thermally conductive insulating fiber.

[0080] Reference Figure 2 , Figure 3 and Figure 6 As shown, in some embodiments, the cooling device further includes a controller 700 and a temperature sensor 800. The controller 700 is electrically connected to the temperature sensor 800 and the negative pressure structure 300, respectively. The temperature sensor 800 is used to detect the real-time temperature information of the battery cell 210, and the controller 700 is used to control the working state of the negative pressure structure 300 according to the real-time temperature information to achieve real-time and accurate temperature regulation.

[0081] For example, when the temperature sensor 800 detects a high real-time temperature, the controller 700 can increase the power of the negative pressure structure 300 to accelerate the flow of the cooling medium and achieve rapid heat dissipation. When the temperature sensor 800 detects a low real-time temperature, the controller 700 can decrease the power of the negative pressure structure 300 to slow down the flow of the cooling medium and save energy.

[0082] Reference Figures 1 to 6 As shown in the figure, this application embodiment also provides a battery pack assembly, including a battery pack 200 and a cooling device or cooling plate structure.

[0083] The specific structure and implementation principle of the cooling plate structure and cooling device in this embodiment are the same as those of the cooling plate structure and cooling device provided in the above embodiments, and can bring the same or similar technical effects. They will not be described in detail here, but can be referred to the description of the above embodiments.

[0084] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0085] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooling plate structure, characterized by, Includes a liquid-cooled plate unit (100) for heat exchange contact with the battery cells (210) of the battery pack (200); The liquid-cooled plate unit (100) has a bent cooling channel (110) for the flow of cooling medium, and an inlet (120) and an outlet (130) communicating with the cooling channel (110). The liquid-cooled plate unit (100) has a plurality of additional channels (140), which are spaced apart along the direction from the inlet (120) to the outlet (130). At least one end of each additional channel (140) is connected to the cooling channel (110) so that external cooling medium can flow into the cooling channel (110) and the additional channels (140) through the inlet (120) to exchange heat with the battery cell (210) and then flow out through the outlet (130).

2. The cooling plate structure according to claim 1, characterized by The inner diameter of the cooling channel (110) gradually decreases in the direction from the liquid inlet (120) to the liquid outlet (130).

3. The cooling plate structure according to claim 1, characterized by The central axis of the additional flow channel (140) is inclined relative to the central axis of the cooling flow channel (110).

4. The cooling plate structure according to claim 3, characterized by All of the additional flow channels (140) are tilted in the same direction; Alternatively, in the direction of flow of the cooling medium, at least a portion of the central axis of the additional flow channel (140) is inclined toward a direction away from the cooling flow channel (110).

5. The cooling plate structure according to claim 3, characterized by The additional flow channel (140) is inclined at an angle ranging from 30 degrees to 60 degrees relative to the cooling flow channel (110).

6. The cooling plate structure according to any one of claims 1 to 5, characterized in that, Along the width direction of the cooling channel (110), the additional channels (140) are provided on both sides of the cooling channel (110), and the additional channels (140) on both sides of the cooling channel (110) are symmetrically arranged with respect to the cooling channel (110). And / or, the inner wall of the additional flow channel (140) and / or the inner wall of the cooling flow channel (110) are provided with a hydrophobic coating (150). And / or, all of the additional flow channels (140) are evenly spaced along the direction from the inlet (120) to the outlet (130); And / or, the side of the liquid cooling plate unit (100) facing the battery unit (210) is provided with a heat-conducting structure (160). And / or, the additional flow channel (140) is a straight flow channel or a curved flow channel.

7. A cooling device, characterized in that, It includes a negative pressure structure (300), an inlet manifold (400), an outlet manifold (500), and at least two cooling plate structures as described in any one of claims 1 to 6; At least two liquid-cooled plate units (100) are arranged alternately with the battery unit (210); One end of the liquid inlet manifold (400) has a liquid inlet port (410) for external cooling medium to flow in. The liquid inlet manifold (400) is connected to the liquid inlets (120) of all the liquid cooling plate units (100). The negative pressure structure (300) is provided in the liquid inlet manifold (400) to transport the external cooling medium into the liquid inlet manifold (400) under the negative pressure of the negative pressure structure (300). One end of the liquid outlet manifold (500) has a liquid outlet port (510) for discharging the cooling medium. The liquid outlet manifold (500) is connected to the liquid outlet ports (130) of all the liquid cooling plate units (100) so that the external cooling medium can flow into each of the cooling channels (110) and the auxiliary channels (140) through the liquid inlet port (410) and the liquid inlet port (120) to exchange heat with the battery unit (210) and then be discharged through the liquid outlet port (130) and the liquid outlet port (510).

8. Cooling device according to claim 7, characterized in that The cooling device further includes a protective housing (600) having a protective cavity, and the cooling plate structure is located inside the protective cavity.

9. Cooling device according to claim 8, characterized in that The outer periphery of the liquid cooling plate unit (100) is provided with a sealing groove (170), and a sealing element (180) is provided in the sealing groove (170). The sealing element (180) is sealed and fitted to the inner wall of the protective shell (600). And / or, the protective housing (600) includes an inner housing (610) and an outer housing (620) disposed outside the inner housing (610), and a thermally conductive insulating structure (630) is provided between the inner housing (610) and the outer housing (620). And / or, the cooling device further includes a controller (700) and a temperature sensor (800), the controller (700) being electrically connected to the temperature sensor (800) and the negative pressure structure (300) respectively, the temperature sensor (800) being used to detect the real-time temperature information of the battery cell (210), and the controller (700) being used to control the working state of the negative pressure structure (300) according to the real-time temperature information.

10. A battery pack assembly, comprising: It includes a battery pack (200) and a cooling plate structure as described in any one of claims 1 to 6 or includes a cooling device as described in any one of claims 7 to 9.

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