Liquid cooling plate, battery pack and energy storage cabinet

Abstract

The application provides a liquid cooling plate, a battery pack and an energy storage cabinet, and relates to the technical field of battery pack thermal management. The liquid cooling plate comprises a flow channel plate, a base plate located on one side of the flow channel plate, a plurality of water inlet flow channels and a plurality of water return flow channels located on the other side of the flow channel plate. The plurality of water inlet flow channels and the plurality of water return flow channels extend along the length direction of the liquid cooling plate; the plurality of water inlet flow channels and the plurality of water return flow channels comprise a plurality of pairs of flow channels, and the plurality of pairs of flow channels are arranged side by side in the width direction of the liquid cooling plate; the flow channel plate is provided with a plurality of water inlet holes and a plurality of water return holes, the plurality of water inlet holes and the plurality of water return holes are distributed at intervals along the length direction, the water inlet flow channel in a pair of flow channels is communicated with the plurality of water inlet holes, and the water return flow channel in the pair of flow channels is communicated with the plurality of water return holes; the upper surface of the flow channel plate is provided with a flow channel groove, at least one of the plurality of water inlet holes and at least one of the plurality of water return holes are arranged on the groove bottom of the flow channel groove, and the flow channel groove communicates with a pair of flow channels. The liquid cooling plate can improve the problem that the temperature consistency of a plurality of battery cells in the battery pack is low.

Description

Technical Field

[0001] This application relates to the field of battery pack thermal management technology, and in particular to a liquid cooling plate, a battery pack, and an energy storage cabinet. Background Technology

[0002] Battery packs in energy storage cabinets typically consist of multiple cells connected in series or parallel. If the heat generated during charging and discharging cannot be dissipated in time, it will lead to uneven cell temperature, reduced lifespan, and even thermal runaway. Therefore, effective thermal management is a prerequisite for ensuring the safety and lifespan of the battery pack. Liquid cooling solutions have become the mainstream thermal management solution for current energy storage battery packs due to their high heat dissipation efficiency. As a core component for heat exchange, the structural optimization of the liquid cooling plate is crucial for improving the temperature uniformity of the battery pack.

[0003] Currently, liquid cooling plates mostly adopt a composite structure of substrate and flow channel plate. As the coolant flows along the flow channel, its temperature gradually rises due to continuous heat absorption, forming a thermal cascade effect. This heat accumulation reduces the heat exchange efficiency in the flow channel area far from the inlet, exacerbates the temperature difference inside the battery pack, and affects the consistency of battery performance and lifespan. Utility Model Content

[0004] This application provides a liquid cooling plate, a battery pack, and an energy storage cabinet. The liquid cooling plate, battery pack, and energy storage cabinet can improve the problem of low temperature uniformity among multiple cells within the battery pack.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] On one hand, this application provides a liquid cooling plate, which includes a substrate, a flow channel plate, multiple inlet water channels, and multiple return water channels. Specifically, in the height direction of the liquid cooling plate, the substrate is located on the upper surface of the flow channel plate, and the multiple inlet water channels and multiple return water channels are all located on the lower surface of the flow channel plate. Multiple inlet channels and multiple return channels extend along the length of the liquid cooling plate; the multiple inlet channels and multiple return channels include multiple pairs of inlet channels and return channels, and each pair of inlet channels and return channels is adjacent to each other in the width direction of the liquid cooling plate; the channel plate is provided with multiple inlet holes and multiple return holes, which are distributed at intervals along the length direction; the inlet channel in a pair of inlet channels and return channels is connected to each inlet hole of the multiple inlet holes, and the return channel in a pair of inlet channels and return channels is connected to each return hole of the multiple return holes; the upper surface of the channel plate is provided with a channel groove, and one or more of the multiple inlet holes and one or more of the multiple return holes are located at the bottom of the channel groove, which is used to connect a pair of inlet channels and return channels.

[0007] In the liquid cooling plate provided in this application, by setting a flow channel plate and multiple pairs of inlet and return water channels, the coolant enters from the inlet water channel of each pair of inlet and return water channels, and then enters the flow channel groove through multiple water inlet holes at the bottom of the flow channel groove of the flow channel plate and fills the flow channel groove. Afterwards, it flows into the return water channel through multiple water return holes at the bottom of the flow channel groove and flows out of the liquid cooling plate. When the workpiece to be cooled (taking a battery cell as an example) is fixed on the upper surface of the substrate provided in this application, the heat of the battery cell is transferred to the substrate, and the coolant located in the flow channel groove can carry away the heat of the battery cell to achieve heat dissipation and cooling of the battery cell.

[0008] Because this application has multiple inlet holes and multiple return holes at the bottom of the flow channel plate, the coolant is divided into multiple paths from the inlet channels of each pair of inlet and return channels located below the flow channel plate and enters the multiple inlet holes. Then, it enters the flow channel tank through the multiple inlet holes. This is equivalent to dividing the coolant (i.e., cold water) in the inlet channels of each pair of inlet and return channels into multiple parallel inlet branches and supplying it into the flow channel tank. After cooling the battery cell, the coolant flows through multiple return holes and then merges into the return channel located below the flow channel plate. This is equivalent to dividing the increased temperature coolant (i.e., hot water) into multiple parallel return branches and flowing into the return channel after cooling the battery cell. Specifically, the liquid flow path in this application involves the coolant being divided into multiple paths from bottom to top and fed into the flow channel groove. It then flows from one side of the flow channel groove to the other, and from the other side, it splits into multiple paths and flows out of the flow channel plate. Finally, it merges from top to bottom into the return flow channel located below the flow channel plate. This allows multiple cells in the battery pack to be fixed to the substrate. Since each row of cells has multiple inlet and outlet holes along its length, multiple parallel liquid flow paths can be formed. Compared to some designs where the liquid flow path is parallel to the upper surface of the substrate, this application shortens each liquid flow path, reducing thermal cascading effects. Therefore, multiple cells can receive relatively balanced heat dissipation. Compared to some designs where the coolant flows on a plane parallel to the upper surface of the substrate, this application improves the problem of low temperature uniformity among the multiple cells in the battery pack. Furthermore, by setting multiple parallel liquid flow paths and shortening each path, this application can reduce the flow resistance of the liquid cooling plate to a certain extent, improving the heat dissipation effect.

[0009] In one implementation, the upper surface of the flow channel plate is provided with multiple flow channel grooves, which are arranged side by side along the width direction and each flow channel groove extends along the length direction; multiple water inlet holes and multiple water return holes are all set at the bottom of a flow channel groove, and a pair of water inlet channels and water return channels are connected to a flow channel groove through multiple water inlet holes and multiple water return holes.

[0010] Through the aforementioned configuration, this application enables multiple rows of cells arranged along the width of the battery pack to achieve independent heat dissipation and cooling via their respective pairs of inlet and outlet water channels and the corresponding flow channel grooves. The heat dissipation paths of each row of cells are independent, reducing thermal cascading effects, improving temperature consistency across multiple battery modules, and resulting in a more uniform temperature distribution across the battery pack. Furthermore, this design features only one flow channel groove along the length of the liquid cooling plate, simplifying the configuration, reducing the processing difficulty of the flow channel plate, and improving the manufacturing cost and efficiency of the liquid cooling plate.

[0011] In one implementation, the bottom of the flow channel has a plurality of first protrusions protruding in the direction toward the substrate, the plurality of first protrusions being located between a plurality of water inlet holes and a plurality of water return holes and being spaced apart along the length direction.

[0012] This application enhances the structural strength and reliability of the flow channel plate by incorporating first protrusions. By placing multiple first protrusions between multiple inlet holes and multiple return holes, and spacing these protrusions apart, the first protrusions do not obstruct the flow of coolant from the inlet holes towards the return holes through the flow channel. Instead, they act as a guide, directing coolant flow from the gap between adjacent first protrusions to the return holes. Since the gap between any two adjacent first protrusions is significantly smaller than the length of the flow channel, the coolant flow velocity increases from the large-diameter area to the small-diameter area. This reduces the flow resistance in the remaining areas of the flow channel plate outside the gap between adjacent first protrusions, promoting uniform coolant distribution.

[0013] In one implementation, the upper surface of the flow channel plate is provided with multiple rows of flow channel grooves, which are arranged side by side along the width direction. Each row of flow channel grooves includes multiple flow channel grooves arranged along the length direction. The inlet flow channel in a pair of inlet flow channels and return flow channels is connected to a row of flow channel grooves through multiple inlet holes, and the return flow channel in a pair of inlet flow channels and return flow channels is connected to a row of flow channel grooves through multiple return holes.

[0014] This application employs a multi-row flow channel configuration. After the coolant flows in through the inlet channel of each pair of inlet and return channels, it is divided into multiple parallel paths entering different channels within the corresponding row of channels. These multiple paths then exit through the return holes of different channels before merging back into the return channels of the same pair of inlet and return channels. This allows multiple independent cooling zones to be formed within each row of channels, providing targeted cooling for different areas of the battery pack. For example, by adjusting the number and diameter of the inlet and return holes in different cooling zones, the flow distribution to each zone can be controlled, achieving differentiated heat dissipation. Alternatively, the size, number and diameter of the inlet holes, and the number and diameter of the return holes in each cooling zone can be made identical to ensure uniform heat dissipation across all zones.

[0015] In one implementation, each flow channel has an inlet hole and an outlet hole at its bottom.

[0016] This application provides a water inlet hole and a water return hole at the bottom of each flow channel. This arrangement is simple, facilitates the preparation of the liquid cooling plate, and helps to achieve consistent heat dissipation performance in different cooling zones of the liquid cooling plate.

[0017] In one implementation, a portion of the multiple flow channels has multiple water inlet holes at its bottom, while another portion has only one water inlet hole at its bottom; or, a portion of the multiple flow channels has multiple water return holes at its bottom, while another portion has only one water return hole at its bottom; or, the diameter of the water inlet holes at the bottom of a portion of the multiple flow channels is not equal to the diameter of the water inlet holes at the bottom of the other portion of the multiple flow channels; or, the diameter of the water return holes at the bottom of a portion of the multiple flow channels is not equal to the diameter of the water return holes at the bottom of the other portion of the multiple flow channels.

[0018] This application, by differentiating the diameter or number of inlet and outlet water holes, can provide differentiated heat dissipation effects for different flow channel slots. When the heat generation of multiple cells is different, the cell with higher heat generation can be placed in a position with larger inlet and outlet water hole diameters or larger inlet and outlet water numbers, which can improve the heat dissipation effect of the cell with higher heat generation and help achieve temperature consistency of multiple cells.

[0019] In one implementation, the wall of each channel groove has a second protrusion that protrudes toward the interior of the channel groove.

[0020] This application enhances the structural strength and reliability of the flow channel plate by incorporating a second protrusion. Furthermore, the second protrusion also serves a guiding function, directing a portion of the coolant along its sidewall, which promotes uniform coolant distribution.

[0021] In one implementation, the liquid cooling plate further includes a baffle plate. In the height direction, the baffle plate is located on the lower surface of the flow channel plate and covers the upper surfaces of multiple inlet channels and multiple return channels. The baffle plate has multiple first through holes and multiple second through holes, which are spaced apart along the length direction. A pair of inlet channels and a pair of return channels are connected to multiple inlet holes through the multiple first through holes, and a pair of inlet channels and a pair of return channels are connected to multiple return holes through the multiple second through holes.

[0022] This application, by setting up a baffle plate that covers the upper surfaces of multiple inlet and return water channels, essentially seals the openings of the inlet and return water channels. The coolant in the inlet channels can only flow out through the first through hole and enter the inlet hole, thus preventing cold water from flowing out from the area between the projections of two adjacent inlet holes on the inlet channel, and hot water from flowing out from the area between the projections of two adjacent return holes on the return channel, thereby preventing water leakage caused by poor sealing of the liquid cooling plate.

[0023] In one implementation, the outermost channel in the width direction is the inlet channel; along the width direction, among the outermost pair of inlet and return channels and the adjacent pair of inlet and return channels, the return channel in the outermost pair of inlet and return channels is adjacent to the inlet channel in the other pair of inlet and return channels.

[0024] Since the inlet channels are used to supply cold water, when a single cold water supply source supplies cold water into each inlet channel, this application uses all the outermost channels along the width direction as inlet channels. This results in a longer path for the cold water supply source when it enters each inlet channel, improving the heat dissipation effect of the liquid cooling plate. Furthermore, correspondingly, since the outermost channels in the width direction are inlet channels, and multiple return channels are located between the two outermost inlet channels, the distribution of the return channels is denser than that of the inlet channels. When hot water is discharged, the return path of the combined return channels is shorter than the path taken by the cold water supply source when it enters each inlet channel. Therefore, this layout increases the cold water path length and reduces the hot water path length, which is beneficial for improving the heat dissipation effect of the liquid cooling plate.

[0025] In one implementation, multiple inlet channels and multiple return channels are alternately distributed along the width direction.

[0026] When the multiple inlet channels and multiple return channels of this application are arranged in this layout, the inlet channels for supplying cold water and the return channels for supplying hot water are arranged alternately, resulting in a more uniform distribution of hot and cold water. This can reduce the temperature difference of the liquid cooling plate and improve the temperature consistency of each area of ​​the liquid cooling plate.

[0027] On the other hand, this application provides a battery pack, which includes a housing, a plurality of battery cells and a liquid cooling plate in any of the above implementations, wherein the liquid cooling plate and the plurality of battery cells are disposed inside the housing, and the plurality of battery cells are fixed to the upper surface of the substrate in the liquid cooling plate.

[0028] The battery pack provided in this application includes the aforementioned liquid cooling plate, which at least improves the problem of low temperature uniformity among the multiple cells within the battery pack.

[0029] In one implementation, the upper surface of the flow channel plate has multiple flow channel grooves arranged side-by-side along the width direction, and each flow channel groove extends along the length direction. Multiple inlet holes and multiple return holes are located at the bottom of one flow channel groove, and a pair of inlet and return channels are connected to the flow channel groove through the multiple inlet and return holes. Multiple battery cells form multiple rows of battery cells arranged along the width direction; each row of battery cells corresponds to one flow channel groove; in the height direction, each row of battery cells is positioned above its corresponding flow channel groove.

[0030] With the above-mentioned configuration, each row of cells corresponds to one flow channel groove, which simplifies the structure of the flow channel plate. Furthermore, when designing the battery pack, the number and size of the flow channel grooves can be designed according to the number of rows of cells and the number of cells contained in each row. For example, the length of the flow channel groove can be made to be equivalent to the length of each row of cells, and the width of the flow channel groove can be made to be equivalent to the width of each row of cells, which simplifies the design of the liquid cooling plate.

[0031] In one implementation, the upper surface of the flow channel plate is provided with multiple rows of flow channel grooves, which are arranged side by side along the width direction. Each row of flow channel grooves includes multiple flow channel grooves arranged along the length direction. The inlet flow channel of a pair of inlet flow channels and the return flow channel are respectively connected to a row of flow channel grooves through multiple inlet holes, and the return flow channel of a pair of inlet flow channels and the return flow channel are respectively connected to a row of flow channel grooves through multiple return holes. Multiple battery cells form multiple rows of battery cells arranged along the width direction; each row of battery cells corresponds to a row of flow channel grooves; in the height direction, each battery cell is positioned above a corresponding flow channel groove.

[0032] That is, the projection of one cell in each row of cells onto the flow channel plate covers one flow channel slot in the corresponding row of flow channel slots. The flow channel slots under each cell can cool the cell, which can improve the temperature consistency of multiple cells. The number of flow channel slots in each row of flow channel slots can be determined according to the number of cells in each row of cells.

[0033] In another aspect, this application also provides an energy storage cabinet, which includes a cabinet and a plurality of battery packs in any of the above implementations, with the plurality of battery packs stacked inside the cabinet.

[0034] Since the energy storage cabinet provided in this application includes the aforementioned battery pack, it can at least improve the problem of low temperature uniformity among multiple cells within the battery pack. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the photovoltaic energy storage system provided in the embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the structure of the energy storage cabinet provided in the embodiments of this application;

[0037] Figure 3 This is one of the structural schematic diagrams of the liquid cooling plate provided in the embodiments of this application;

[0038] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0039] Figure 5 for Figure 3 A magnified view of a section at point B in the middle;

[0040] Figure 6 For adopted Figure 3 A partial structural diagram of the battery pack with liquid cooling plate in the middle;

[0041] Figure 7 This is the second schematic diagram of the structure of the liquid cooling plate provided in the embodiments of this application;

[0042] Figure 8 for Figure 7 A magnified view of a section at point C;

[0043] Figure 9 for Figure 7 One of the partial structural diagrams of the flow channel plate in the liquid cooling plate;

[0044] Figure 10 for Figure 7 The second schematic diagram of a portion of the flow channel plate in the liquid cooling plate;

[0045] Figure 11 for Figure 7 Schematic diagram of part of the flow channel plate in the liquid cooling plate;

[0046] Figure 12 For adopted Figure 7 A partial structural diagram of the battery pack with liquid cooling plate in the middle;

[0047] Figure 13 for Figure 12 One of the schematic diagrams of a partial structure of the battery pack in the image;

[0048] Figure 14 for Figure 12 The second schematic diagram of the partial structure of the battery pack in the diagram;

[0049] Figure 15 This is one of the liquid flow path topologies of the liquid cooling plate provided in the embodiments of this application;

[0050] Figure 16 This is the second liquid flow path topology diagram of the liquid cooling plate provided in the embodiments of this application;

[0051] Figure 17The third liquid flow path topology diagram of the liquid cooling plate provided in the embodiments of this application;

[0052] Figure 18 The fourth liquid flow path topology diagram of the liquid cooling plate provided in the embodiments of this application.

[0053] Figure label:

[0054] 01-Photovoltaic-storage system; 1000-Energy storage system; 100-Energy storage cabinet; 200-Power converter; 2000-Photovoltaic module; 3000-Photovoltaic inverter; 4000-Transformer; 5000-Grid;

[0055] 10-Box;

[0056] 20-Battery pack; 21-Casing; 22-Cell; 221-First row of cells; 23-Liquid cooling plate;

[0057] 231-Substrate;

[0058] 232-Flow channel plate; 2321-Flow channel groove; 23211-First row of flow channel grooves; 2322-Water inlet hole; 2323-Water return hole; 2324-First protrusion; 2325-Second protrusion; 2326-Third protrusion;

[0059] 233-Inlet flow channel plate; 2331-Inlet flow channel; 2332-Inlet;

[0060] 234-Return water channel plate; 2341-Return water channel; 2342-Return water outlet;

[0061] 236-Baffle plate; 2361-First through hole; 2362-Second through hole. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] The terms "first," "second," and similar terms used in this article do not indicate any order, quantity, or importance, but are merely used to distinguish different components.

[0064] In the embodiments of this application, the terms "example" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "example" or "for example" is intended to present the relevant concepts in a specific manner. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0065] To facilitate understanding of the energy storage cabinet 100 provided in this application embodiment, its application scenarios are first introduced below. The energy storage cabinet 100 is a system that can store electrical energy through a certain medium and release the stored energy to generate electricity when needed. It can be used as a load balancing device and backup power supply in everyday home environments, industrial and commercial parks, large ground-based power stations, uninterruptible power supplies (UPS), or photovoltaic energy storage systems, etc. The application of the energy storage cabinet 100 will be briefly explained using the photovoltaic energy storage system 01 scenario as an example.

[0066] Figure 1 Please refer to the structural schematic diagram of the photovoltaic energy storage system 01 provided in the embodiments of this application. Figure 1 The photovoltaic-storage system 01 includes photovoltaic modules 2000, photovoltaic inverters 3000, energy storage system 1000, and transformers 4000. The photovoltaic modules 2000 convert solar energy into direct current (DC). The photovoltaic inverters 3000 convert the DC power generated by the photovoltaic modules 2000 into alternating current (AC) and supply it to the transformers 4000. The transformers 4000 then boost the AC power output from the photovoltaic inverters 3000 before supplying it to the power grid 5000, thus enabling the photovoltaic-storage system 01 to connect to the grid.

[0067] The energy storage system 1000 includes an energy storage cabinet 100 and a power converter 200. The energy storage cabinet 100 is electrically connected to the power converter 200. The energy storage cabinet 100 is used to store electrical energy, and the power converter 200 is used to convert the electrical energy input to the energy storage cabinet 100 or the electrical energy output from the energy storage cabinet 100 into power. For example, the power converter 200 is a power conversion system (PCS). For example, the power converter 200 is used to convert AC power input from an external AC power source (e.g., a photovoltaic inverter 3000) into DC power output to the energy storage cabinet 100, and / or, the power converter 200 is used to convert the DC power output from the energy storage cabinet 100 into AC power output to external electrical equipment (e.g., the power grid 5000).

[0068] For example, the power converter 200 is used to convert a portion of the electrical energy output from the photovoltaic inverter 3000 into direct current (DC) to charge the energy storage cabinet 100 when the electrical energy generated by the photovoltaic module 2000 exceeds the power demand of the grid 5000; or, when the electricity price on the grid 5000 is low, the power converter 200 is used to convert alternating current (AC) from the grid 5000 into DC to charge the energy storage cabinet 100. Furthermore, the power converter 200 is also used to convert the electrical energy stored in the energy storage cabinet 100 into alternating current (AC) and, after being stepped up by the transformer 4000, to the grid 5000 when the electrical energy output from the photovoltaic module 2000 cannot meet the power demand of the grid 5000, thereby providing a more stable power supply to the grid 5000.

[0069] Figure 2 This is a schematic diagram of the structure of the energy storage cabinet 100 provided in an embodiment of this application. For example, please refer to... Figure 2 and Figure 3 The energy storage cabinet 100 includes a housing 10 and multiple battery packs 20 fixed inside the housing 10 and stacked thereon. Each battery pack 20 includes a housing 21, multiple battery cells 22, and a liquid cooling plate a, all of which are housed within the housing 21. The liquid cooling plate a has liquid channels, and the multiple battery cells 22 are mounted on the liquid cooling plate a, which is used to cool the multiple battery cells 22.

[0070] For example, the energy storage system 1000 also includes a Battery Management System (BMS). The BMS monitors the voltage, current, temperature, state of charge, and health of each cell 22 or battery pack 20 in real time, and can also adjust the charging and discharging cycles of the battery pack 20. The BMS can issue alarms and perform protective actions (such as disconnecting contactors, requesting the PCS to reduce power, or shutting down) in cases of overvoltage, undervoltage, overcurrent, short circuit, overtemperature, or excessive temperature difference. For example, the BMS can be located inside the battery pack 20, outside the battery pack 20, or outside the housing 10.

[0071] In some embodiments, the liquid cooling plate a adopts a composite structure of a substrate and a flow channel plate. However, as the coolant flows along the flow channel, its temperature gradually increases due to continuous heat absorption, forming a thermal cascade effect. This heat accumulation reduces the heat exchange efficiency in the flow channel region far from the inlet, exacerbating the temperature difference inside the battery pack 20 and affecting the consistency of battery performance and lifespan. Based on this, this application provides a liquid cooling plate 23, which can improve the problem of low temperature uniformity among multiple cells 22 in the battery pack 20 and improve the temperature balance among multiple cells 22 in the battery pack 20.

[0072] The specific structure of the liquid cooling plate 23 provided in this application will be described in detail below. The liquid cooling plate 23 can be applied in the aforementioned battery pack 20 to cool the battery cells 22 within the battery pack 20.

[0073] Figure 3 This is one of the structural schematic diagrams of the liquid cooling plate 23 provided in the embodiments of this application, referring to... Figure 3 As shown, the liquid cooling plate 23 includes a substrate 231, a flow channel plate 232, multiple inlet water channels 2331 and multiple return water channels 2341.

[0074] The flow channel plate 232 and the substrate 231 are stacked, and the flow channel plate 232 is fixed to one side of the substrate 231. The inlet flow channel 2331 and the return flow channel 2341 are both located on the side of the flow channel plate 232 away from the substrate 231. The inlet flow channel 2331 and the return flow channel 2341 are arranged side by side along the arrangement direction perpendicular to the substrate 231 and the flow channel plate 232.

[0075] That is, in the height direction Z of the liquid cooling plate 23, the substrate 231 is located on the upper surface of the flow channel plate 232, and multiple water inlet channels 2331 and multiple water return channels 2341 are located on the lower surface of the flow channel plate 232.

[0076] Figure 4 for Figure 3 A magnified view of a section at point A, in conjunction with reference. Figure 3 and Figure 4 As shown, for example, the inlet channel 2331 is disposed on the inlet channel plate 233, and the return channel 2341 is disposed on the return channel plate 234.

[0077] For example, the bottom of the water inlet channel 2331 has a water inlet 2332, which is connected to a plurality of water inlet holes 2322 on the channel plate 232 (the water inlet holes 2322 will be described in detail below) through the water inlet channel 2331. The water inlet 2332 is used to allow coolant to flow into the water inlet channel 2331.

[0078] In this embodiment, as Figure 3 As shown, each of the multiple inlet channels 2331 and each of the multiple return channels 2341 extends along the length direction X of the liquid cooling plate 23.

[0079] Multiple inlet channels 2331 and multiple return channels 2341 form multiple pairs of inlet and return channels (for ease of understanding and explanation, the multiple pairs of inlet and return channels will be referred to as multiple channels, and a pair of inlet and return channels will be referred to as a pair of channels). The multiple pairs of channels are arranged side by side along the width direction Y, and each pair of channels is adjacent to each other in the width direction Y of the liquid cooling plate 23.

[0080] That is, along the width direction Y of the liquid cooling plate 23, one adjacent inlet channel 2331 and one adjacent return channel 2341 form a pair of channels, and the multiple inlet channels 2331 and the multiple return channels 2341 together form multiple pairs of channels. For example, Figure 3 and Figure 4 The dashed box in the middle shows an inlet channel 2331 and an outlet channel 2341, which constitute a pair of channels.

[0081] Figure 5 for Figure 3 A magnified view of a section at point B, in conjunction with reference. Figure 3 and Figure 5 As shown, the flow channel plate 232 is provided with multiple water inlet holes 2322 and multiple water return holes 2323. The multiple water inlet holes 2322 are distributed at intervals along the length X of the liquid cooling plate 23, and the multiple water return holes 2323 are distributed at intervals along the length X of the liquid cooling plate 23. Among them, the water inlet channel 2331 in a pair of flow channels is connected to each of the multiple water inlet holes 2322, and the water return channel 2341 in a pair of flow channels is connected to each of the multiple water return holes 2323.

[0082] The upper surface of the flow channel plate 232 is provided with a flow channel groove 2321, one or more of the plurality of water inlet holes 2322 are provided at the bottom of the flow channel groove 2321, and one or more of the plurality of water return holes 2323 are provided at the bottom of the flow channel groove 2321. The flow channel groove 2321 is used to connect a pair of flow channels.

[0083] That is, the flow channel plate 232 of this application is provided with a flow channel groove 2321, and the bottom of the flow channel groove 2321 is provided with one or more water inlet holes 2322. For example, combined with Figure 3 and Figure 5 As shown, the bottom of the flow channel 2321 can be provided with multiple water inlet holes 2322; for example, the bottom of the flow channel 2321 can also be provided with one water inlet hole 2322.

[0084] Similarly, the bottom of the flow channel 2321 is provided with one or more return water holes 2323. For example, combined with Figure 3 and Figure 5 As shown, the bottom of the flow channel 2321 can be provided with multiple return water holes 2323; for example, combined with Figure 7 and Figure 8 As shown, a return water hole 2323 can also be provided at the bottom of the flow channel 2321.

[0085] This application provides an inlet channel 2331, through which coolant flows into the liquid cooling plate 23 from each pair of channels. The coolant is then divided into multiple paths through the inlet channel 2331 and enters multiple inlet holes 2322. It then enters and fills the channel groove 2321. In this way, the coolant flowing in the channel groove 2321 can remove the heat from the battery cell 22 placed above the substrate 231. After removing the heat from the battery cell 22, the coolant temperature rises and becomes hot water (it should be understood that the coolant can be water or other fluids; hot water is only used to represent the temperature rise of the coolant). After that, the coolant is divided into multiple paths and enters multiple return holes 2323. Then, the paths merge and flow out through the return channel 2341.

[0086] For example, the water inlet channel 2331 in each pair of channels is located below the area of ​​multiple water inlets 2322 corresponding to the pair of channels. The projection of the multiple water inlets 2322 on the water inlet channel plate 233 is located inside the water inlet channel 2331. In this way, the coolant flowing out from the water inlet channel 2331 can enter different water inlets 2322 along the height direction Z of the liquid cooling plate 23. The path from the water inlet channel 2331 to the multiple water inlets 2322 is shorter, which can reduce temperature loss.

[0087] Combined with reference Figures 3 to 5 As shown, for example, the bottom of the return water channel 2341 has a return water inlet 2342, which is connected to multiple return water holes 2323 through the return water channel 2341. The return water inlet 2342 is used to supply hot water to flow out of the return water channel 2341.

[0088] For example, the return water channel 2341 in each pair of channels is located below the area of ​​multiple return water holes 2323 corresponding to the pair of channels. The projection of the multiple return water holes 2323 on the return water channel plate 234 is located in the return water channel 2341. In this way, the hot water flowing out from the multiple return water holes 2323 can enter the return water channel 2341 along the height direction Z of the liquid cooling plate 23. The path from the multiple return water holes 2323 to the return water channel 2341 is short, which allows the hot water to be discharged quickly.

[0089] In the liquid cooling plate 23 provided in this application, by setting a flow channel plate 232 and multiple pairs of flow channels, the coolant enters the liquid cooling plate 23 from the inlet flow channel 2331 of each pair of flow channels, and can be divided into multiple paths to enter multiple inlet holes 2322 corresponding to the pair of flow channels and fill the flow channel groove 2321. Then, it flows into the return flow channel 2341 through multiple return holes 2323 at the bottom of the flow channel groove 2321, and finally flows out of the liquid cooling plate 23 from the return flow channel 2341. When multiple battery cells 22 are fixed to the upper surface of the substrate 231 in the liquid cooling plate 23, the heat of the multiple battery cells 22 is transferred to the substrate 231, and the coolant in the flow channel groove 2321 can carry away the heat of the multiple battery cells 22 to achieve heat dissipation and cooling of the multiple battery cells 22.

[0090] Figure 6 For adopted Figure 3 A partial structural diagram of the battery pack 20 with liquid cooling plate 23 in the middle, in conjunction with reference. Figure 5 and Figure 6 As shown, because this application has multiple inlet holes 2322 and multiple return holes 2323 at the bottom of the flow channel 2321, the coolant enters the liquid cooling plate 23 from the inlet channel 2331 in each pair of flow channels below the flow channel plate 232, and then splits into multiple paths that enter the multiple inlet holes 2322 respectively. This is equivalent to dividing the coolant (i.e., cold water) in the inlet channel 2331 of each pair of flow channels into multiple parallel inlet branches and supplying it into the flow channel 2321; after cooling the battery cell 22, it flows through multiple return holes 2323 and then merges into the return channel 2341, and finally flows out of the liquid cooling plate from the return channel 2341. This is equivalent to dividing the increased temperature coolant (i.e., hot water) after cooling the battery cell 22 into multiple parallel return branches and then merging them into the return channel 2341.

[0091] That is, the liquid flow path of this application is as follows: the coolant is divided into multiple paths from bottom to top and supplied into the flow channel 2321, then flows from one side of the flow channel 2321 to the other side, and then splits into multiple paths from the other side of the flow channel 2321 and flows out of the flow channel plate 232, and then merges from top to bottom into the return water flow channel 2341 located below the flow channel plate 232. The plane containing the multiple liquid flow paths through the multiple water inlets 2322 ( Figure 6 The YZ planes in the substrate are parallel to each other, and the plane containing each liquid flow path is perpendicular to the upper surface of the substrate 231 (the upper surface of the substrate 231 is...). Figure 6 In the XY plane, the liquid flow path of each liquid channel is shown in the figure. Figure 6 (As shown by the dashed line with arrows in the image). This secures multiple battery cells 22 in the battery pack 20 to the substrate 231. Figure 6 The diagram shows four rows of battery cells, with one row showing multiple cells 22 and the other three rows showing only one cell 22. Since each row of cells (each row consists of multiple cells 22 arranged along the length direction X)... Figure 6 The dashed box shows a row of battery cells. Multiple water inlets 2322 and multiple water outlets 2323 are provided along the length direction X, forming multiple parallel liquid flow paths. Compared to some designs where the liquid flow path is parallel to the upper surface of the substrate, this application can shorten each liquid flow path, reducing thermal cascading effects. Therefore, the multiple battery cells 22 can achieve relatively balanced heat dissipation. This is different from some designs where the coolant flows along a plane parallel to the upper surface of the substrate 231. Figure 6Regarding the flow on the YZ plane, this application can improve the problem of low temperature uniformity among multiple cells 22 within the battery pack 20.

[0092] In addition, by setting up multiple parallel liquid channels, the liquid flow path of each liquid channel is shortened, which can reduce the flow resistance of the liquid cooling plate 23 to a certain extent and improve the heat dissipation effect.

[0093] This application does not impose specific restrictions on the number and distribution of flow channel grooves 2321 on the flow channel plate 232. The layout of flow channel grooves 2321 on the flow channel plate 232 will be described below by way of example.

[0094] (1) The first layout of the flow channel groove 2321 on the flow channel plate 232:

[0095] Combined with reference Figure 3 and Figure 4 The upper surface of the flow channel plate 232 is provided with multiple flow channel grooves 2321, which are arranged side by side along the width direction Y, and each flow channel groove 2321 extends along the length direction X.

[0096] For example, this application does not limit the specific number of flow channel grooves 2321 on the flow channel plate 232, which can be determined according to the number of rows of cells 22 in the battery pack 20. For example, if the battery pack 20 has four rows of cells, then the flow channel plate 232 has four flow channel grooves 2321.

[0097] When the flow channel 2321 includes multiple channels, the liquid cooling plate 23 includes multiple pairs of flow channels. For example, the flow channel 2321 includes four channels, and the liquid cooling plate 23 includes four pairs of flow channels, that is, the liquid cooling plate 23 includes four inlet flow channels 2331 and four return flow channels 2341.

[0098] In this layout, multiple water inlets 2322 and multiple water return holes 2323 are all located at the bottom of a flow channel 2321, and a pair of flow channels are connected to a flow channel 2321 through multiple water inlets 2322 and multiple water return holes 2323.

[0099] In other words, each flow channel 2321 has multiple inlet holes 2322 and multiple return holes 2323 at its bottom. Each pair of flow channels is connected to the flow channel 2321 through the multiple inlet holes 2322 and multiple return holes 2323 at the bottom of the flow channel 2321.

[0100] This application sets up multiple flow channel grooves 2321 and multiple pairs of flow channels, so that each row of cells in the multiple rows of cells in the battery pack 20 can be connected through a pair of flow channels and a flow channel groove 2321 corresponding to the pair of flow channels. The flow channel groove 2321 is used to independently dissipate heat and cool down the row of cells. The heat dissipation path of each row of cells is independent of each other, which can reduce the thermal cascading effect, improve the temperature consistency of multiple rows of cells, and make the temperature of the battery pack 20 more balanced.

[0101] In addition, this layout has only one flow channel groove 2321 along the length X of the liquid cooling plate 23, which is relatively simple to set up, reduces the processing difficulty of the flow channel plate 232, and improves the manufacturing cost and efficiency of the liquid cooling plate 23.

[0102] When the liquid cooling plate 23 is applied to the battery pack 20, the multiple cells 22 in the battery pack 20 form multiple rows of cells arranged along the width direction Y. If the flow channel grooves 2321 on the flow channel plate 232 adopt the first layout method, combined with Figure 5 and Figure 6 As shown, each row of cells in the multi-row battery cells corresponds to a flow channel groove 2321; in the height direction Y, each row of cells is positioned above the corresponding flow channel groove 2321.

[0103] With the above-mentioned configuration, each row of cells corresponds to one flow channel groove 2321, which simplifies the structure of the flow channel plate 232. When designing the battery pack 20, the number of flow channel grooves 2321 and the size of the flow channel grooves 2321 can be designed according to the number of rows of cells 22 and the number of cells 22 contained in each row. For example, the length of the flow channel groove 2321 is equivalent to the length of each row of cells, and the width of the flow channel groove 2321 is equivalent to the width of each row of cells, which simplifies the design of the liquid cooling plate 23.

[0104] In one implementation, such as Figure 4 As shown, the bottom of the flow channel 2321 has a plurality of first protrusions 2324 protruding in the direction toward the substrate 231. The plurality of first protrusions 2324 are located between a plurality of water inlet holes 2322 and a plurality of water return holes 2323. The plurality of first protrusions 2324 are distributed at intervals along the length direction X.

[0105] This application enhances the structural strength and reliability of the flow channel plate 232 by providing first protrusions 2324. By placing multiple first protrusions 2324 between multiple inlet holes 2322 and multiple return holes 2323, and by spacing the first protrusions 2324 at intervals, the first protrusions 2324 do not obstruct the flow of coolant from the inlet holes 2322 through the flow channel groove 2321 towards the return holes 2323. They also act as a guide, directing coolant flow from the gap between adjacent first protrusions 2324 to the return holes 2323. Since the gap between any two adjacent first protrusions 2324 is significantly smaller than the length (X) of the flow channel groove 2321, the coolant flow velocity increases from the large-diameter region to the small-diameter region. This reduces the flow resistance in the remaining areas of the flow channel plate 232 outside the gaps between adjacent first protrusions 2324, promoting uniform coolant distribution.

[0106] For example, such as Figure 4 As shown, along the arrangement direction of the multiple flow channels 2321, each first protrusion 2324 is located between an inlet hole 2322 and an outlet hole 2323. In this way, after the coolant flows out from the inlet hole 2322, it can flow into the gap between two adjacent first protrusions 2324 under the guidance of the side wall of the first protrusion 2324, and the first protrusion 2324 can play a better guiding role.

[0107] (2) The second layout of the flow channel groove 2321 on the flow channel plate 232:

[0108] Figure 7 This is the second schematic diagram of the structure of the liquid cooling plate 23 provided in the embodiments of this application. Figure 8 for Figure 7 A magnified view of a section at point C, in conjunction with reference. Figure 7 and Figure 8 As shown, the upper surface of the flow channel plate 232 is provided with multiple rows of flow channel grooves (wherein, Figure 8 The dashed box at the top center shows a row of flow channel grooves. Multiple rows of flow channel grooves are arranged side by side along the width direction Y. Each row of flow channel grooves includes multiple flow channel grooves 2321 arranged along the length direction X.

[0109] The difference between this layout and the first layout is that in the first layout, there is only one flow channel groove 2321 along the length direction X of the liquid cooling plate 23; while in the second layout, there is a row of flow channel grooves along the length direction X of the liquid cooling plate 23, and the row of flow channel grooves includes multiple flow channel grooves 2321 arranged along the length direction X.

[0110] In some embodiments, each flow channel 2321 in the same column of flow channel channels has the same area; in other embodiments, at least two flow channel channels 2321 in the same column of flow channel channels have different areas.

[0111] In this layout, the inlet channel 2331 of a pair of flow channels is connected to a row of flow channel grooves through multiple inlet holes 2322, and the return channel 2341 of a pair of flow channels is connected to a row of flow channel grooves through multiple return holes 2323. Figure 8 For example, Figure 8 The water inlet channel 2331 in the pair of flow channels shown in the lower middle dashed box is connected to a row of flow channel grooves shown in the upper dashed box through multiple water inlet holes 2322. The water return channel 2341 in the pair of flow channels is connected to the row of flow channel grooves through multiple water return holes 2323.

[0112] That is, each flow channel 2321 in each row of flow channels is provided with an inlet hole 2322 and a return hole 2323 at the bottom. The inlet flow channel 2331 in each pair of flow channels is connected to each flow channel 2321 in the corresponding row of flow channels through the inlet hole 2322 at the bottom of the flow channel 2321, and the return flow channel 2341 in each pair of flow channels is connected to each flow channel 2321 in the corresponding row of flow channels through the return hole 2323 at the bottom of the flow channel 2321.

[0113] This application employs a multi-row flow channel configuration. Coolant flows in from the inlet channel 2331 of each pair of flow channels, then splits into multiple parallel paths entering different flow channels 2321 within the corresponding row of flow channels. After exiting through the return holes 2323 of each different flow channel 2321, the coolant flows out again and merges back into the return channel 2341 of the same pair of flow channels. This allows multiple independent cooling zones to be formed within the area containing the multiple flow channels 2321 in each row, providing targeted cooling for different areas of the battery pack 20. For example, by adjusting the number and diameter of the inlet and return holes 2322 and 2323 in different cooling zones, the flow distribution in each cooling zone can be controlled, thereby achieving differentiated heat dissipation for each zone. Alternatively, the size, number and diameter of the inlet holes 2322, and the number and diameter of the return holes 2323 in each cooling zone can be made identical to ensure uniform heat dissipation in all cooling zones.

[0114] In one implementation, such as Figure 8 As shown, each flow channel 2321 in each column of flow channel is provided with a water inlet hole 2322 and a water return hole 2323 at the bottom of the channel.

[0115] In this application, a water inlet hole 2322 and a water return hole 2323 are provided at the bottom of each flow channel 2321 in each column of flow channel grooves. This arrangement is simple, facilitates the preparation of the liquid cooling plate 23, and helps to achieve consistent heat dissipation effect in different cooling areas of the liquid cooling plate 23.

[0116] When each channel 2321 in each row of channel channels is provided with an inlet hole 2322 and an outlet hole 2323 at its bottom, in order to achieve balanced heat dissipation, the number and diameter of the inlet holes 2322 at the bottom of all channel channels 2321 in each row of channel channels are the same, and the number and diameter of the outlet holes 2323 at the bottom of all channel channels 2321 are the same. In this way, the heat dissipation capacity of all channel channels 2321 in each row of channel channels is the same. When a row of cells is placed above the row of channel channels, different areas in the row of cells can obtain a relatively balanced heat dissipation effect, which is beneficial to achieving temperature consistency among multiple cells 22.

[0117] In some scenarios, the heat generation of multiple cells 22 in the same row of cells may differ, resulting in different heat dissipation requirements for the multiple cells 22 in the same row. In this case, this application can adjust the bottom fluid flow rate of multiple cells 22 in the same row of cells by appropriately designing the number and diameter of the water inlet holes 2322 and water return holes 2323 at the bottom of each flow channel 2321 in each row of flow channel slots, thereby achieving temperature uniformity among the multiple cells 22 in the same row of cells. For example, the flow rate is allocated according to the heat dissipation requirements of different cells 22 in the same row of cells, so that the diameter and number of water inlet holes 2322 and water return holes 2323 at the bottom of the flow channel slots 2321 below different cells 22 in the same row of cells are differentiated.

[0118] For example, the liquid cooling plate 23 satisfies at least one of the following conditions: a portion of the multiple flow channel grooves 2321 has multiple water inlet holes 2322 at its bottom, and another portion of the multiple flow channel grooves 2321 has one water inlet hole 2322 at its bottom; or, a portion of the multiple flow channel grooves 2321 has multiple water return holes 2323 at its bottom, and another portion of the multiple flow channel grooves 2321 has one water return hole 2322 at its bottom. Water hole 2323; or, the diameter of the water inlet hole 2322 at the bottom of a portion of the multiple flow channels 2321 is not equal to the diameter of the water inlet hole 2322 at the bottom of another portion of the multiple flow channels 2321; or, the diameter of the water return hole 2323 at the bottom of a portion of the multiple flow channels 2321 is not equal to the diameter of the water return hole 2323 at the bottom of another portion of the multiple flow channels 2321.

[0119] Figure 9 for Figure 7The second schematic diagram of the flow channel plate in the liquid cooling plate shows that when the number of water inlet holes 2322 at the bottom of a portion of the flow channel 2321 and the number of water inlet holes 2322 at the bottom of another portion of the flow channel 2321 are different, or when the number of water return holes 2323 at the bottom of a portion of the flow channel 2321 and the number of water return holes 2323 at the bottom of another portion of the flow channel 2321 are different, refer to... Figure 9 As shown, Figure 9 The bottom of the lowest flow channel 2321 has a greater number of inlet holes 2322 and return holes 2323 than the other flow channel 2321, and its heat dissipation efficiency is relatively better than the other flow channel 2321.

[0120] Figure 10 for Figure 7 The third schematic diagram of the partial structure of the flow channel plate 232 in the liquid cooling plate 23 shows that when the diameters of the water inlet holes 2322 at the bottom of a portion of the flow channel 2321 and the water inlet holes 2322 at the bottom of another portion of the flow channel 2321 are different, or when the diameters of the water return holes 2323 at the bottom of a portion of the flow channel 2321 and the water return holes 2323 at the bottom of another portion of the flow channel 2321 are different, refer to... Figure 10 As shown, Figure 10 The bottom of the lowest flow channel 2321 has a larger diameter for the inlet hole 2322 and the return hole 2323 than the other flow channel 2321, resulting in better heat dissipation efficiency.

[0121] When at least two flow channels 2321 in the same row of flow channels have different numbers of inlet holes 2322, the flow channel 2321 with more inlet holes 2322 can inject liquid into the flow channel 2321 from different positions through multiple inlet holes 2322, promoting fluid mixing and circulation, and effectively reducing flow dead zones and temperature stratification. From a flow dynamics perspective, this multi-inlet design can create a more uniform and wider water flow distribution, thereby improving the overall heat exchange efficiency of the liquid cooling plate 23. In addition, the enhanced mixing effect allows heat to be distributed more quickly and evenly throughout the tank and carried away by the return water, improving local overheating.

[0122] When the number of return water holes 2323 in at least two flow channels 2321 within the same column of flow channels differs, the flow channel 2321 with more return water holes 2323 provides greater return water capacity, reduces water flow resistance, thereby allowing for faster water circulation and higher net flow rate. This helps reduce dead water zones within the flow channel 2321, resulting in a more uniform water flow distribution. Simultaneously, the improved water flow distribution enhances heat exchange efficiency, reduces heat accumulation, and improves overall heat dissipation performance.

[0123] When the diameters of the inlet holes 2322 in at least two flow channel slots 2321 in the same row of flow channel slots are different, or the diameters of the return holes 2323 in at least two flow channel slots 2321 in the same row of flow channel slots are different, the flow channel slot 2321 with a larger diameter inlet hole 2322 or a larger diameter return hole 2323 allows the coolant to flow in or out more easily, resulting in lower liquid flow resistance. Under the same pump pressure, the total water flow velocity in the flow channel slot 2321 with a larger diameter inlet hole 2322 or a larger diameter return hole 2323 will be faster, allowing hot water to be carried away and cold water to be introduced more frequently, resulting in a stronger overall heat dissipation effect.

[0124] This application employs a differentiated design in terms of the diameter and number of inlet holes 2322 and return holes 2323, which can provide differentiated heat dissipation effects for different flow channel slots 2321 in the same row of flow channel slots. When the heat generation of multiple cells 22 in the same row of cells is different, the cell 22 with higher heat generation can be placed in a position with a larger inlet / outlet diameter or a larger number of inlet / outlet water, which can improve the heat dissipation effect of the cell 22 with higher heat generation and help improve the temperature consistency of multiple cells 22.

[0125] In one implementation, combining Figure 8 and Figure 9 As shown, the wall of each flow channel 2321 in the same column of flow channel channels has a second protrusion 2325 protruding toward the interior of the flow channel 2321.

[0126] For example, such as Figure 9 As shown, each flow channel 2321 has a second protrusion 2325 on each of the two opposite walls, and the two second protrusions 2325 are located between the water inlet 2322 and the water return 2323 of the flow channel 2321.

[0127] By providing the second protrusion 2325, this application can enhance the structural strength and improve the structural reliability of the flow channel plate 232. In addition, the second protrusion 2325 can also play a guiding role, that is, guide a part of the coolant to flow along the side wall of the second protrusion 2325, which is beneficial to the uniform distribution of coolant.

[0128] Figure 11 for Figure 7One of the partial structural diagrams of the flow channel plate 232 in the liquid cooling plate 23. Figure 11 The structure of only one flow channel groove 2321 in a row of flow channel grooves of flow channel plate 232 is shown in the figure. Figure 7 The third protrusion 2326 is not shown in the diagram. In one implementation, in conjunction with reference to... Figure 8 and Figure 11 As shown, the bottom of each flow channel 2321 has at least one third protrusion 2326 protruding in the direction toward the substrate 231.

[0129] The specific location of the third protrusion 2326 is not limited in this application. For example, the third protrusion 2326 may be located between the water inlet hole 2322 and the water return hole 2323; or the third protrusion 2326 and the water inlet hole 2322 may be arranged side by side along the length direction X; or the third protrusion 2326 and the water return hole 2323 may be arranged side by side along the length direction X; or the third protrusion 2326 may include multiple protrusions, and the multiple third protrusions 2326 may be located at least one of the following positions: between the water inlet hole 2322 and the water return hole 2323; arranged side by side with the water inlet hole 2322 along the length direction X; and arranged side by side with the water return hole 2323 along the length direction X.

[0130] By providing the third protrusion 2326, this application can enhance the structural strength and improve the structural reliability of the flow channel plate 232. In addition, the third protrusion 2326 can also play a guiding role, that is, guide a part of the coolant to flow along the side wall of the third protrusion 2326, which is beneficial to the uniform distribution of coolant.

[0131] The flow channel groove 2321 may contain only the third protrusion 2326, only the second protrusion 2325, or both the third protrusion 2326 and the second protrusion 2325.

[0132] When the flow channel plate 232 has multiple rows of flow channel grooves, and each row of flow channel grooves has multiple flow channel grooves 2321, for example, continuing with reference to the reference... Figure 7 and Figure 8 As shown, in one implementation, the liquid cooling plate 23 further includes a baffle plate 236. In the height direction Z, the baffle plate 236 is located on the lower surface of the flow channel plate 232, and covers the upper surfaces of multiple inlet channels 2331 and multiple return channels 2341. The baffle plate 236 is provided with multiple first through holes 2361 and multiple second through holes 2362, which are spaced apart along the length direction X. In a pair of flow channels, the inlet channels 2331 communicate with multiple inlet holes 2322 through the multiple first through holes 2361, and the return channels 2341 communicate with multiple return holes 2323 through the multiple second through holes 2362.

[0133] This application, by setting a baffle plate 236, covers the upper surfaces of multiple inlet channels 2331 and multiple return channels 2341, essentially sealing the openings of the inlet channels 2331 and the return channels 2341. Coolant in the inlet channels 2331 can only flow out through the first through hole 2361 and into the inlet hole 2322. This prevents cold water from flowing out from the area of ​​the inlet channel 2331 between the projections of two adjacent inlet holes 2322 onto the inlet channel 2331, and prevents hot water from flowing out from the area of ​​the return channel 2341 between the projections of two adjacent return holes 2323 onto the return channel 2341, thus preventing leakage caused by inadequate sealing of the liquid cooling plate 23.

[0134] Especially when the flow channel plate 232 is formed by stamping to create multiple flow channel grooves 2321, when multiple flow channel grooves 2321 are formed on the side of the flow channel plate 232 facing the substrate 231 by stamping, multiple protrusions corresponding to the multiple flow channel grooves 2321 and grooves located between two adjacent protrusions are simultaneously formed on the lower surface of the flow channel plate 232. This application can prevent cold water in the flow channel grooves 2321 from entering the grooves corresponding to the inlet flow channel 2331 by setting the baffle plate 236. Similarly, this application can prevent hot water in the return flow channel 2341 from entering the grooves corresponding to the return flow channel 2341 by setting the baffle plate 236. In this way, the phenomenon of liquid flowing out from the liquid cooling plate 23 due to poor sealing can be avoided.

[0135] Of course, the use of stamping to form the flow channel groove 2321 is only an example. In some embodiments, the flow channel groove 2321 can also be formed by carving a groove in the flow channel plate 232. When a non-stamping process is used or the lower surface of the flow channel plate 232 is flat, if the lower surface of the flow channel plate 232 can cover the opening of the inlet flow channel 2331 and the opening of the return flow channel 2341 to achieve a seal, the above-mentioned baffle plate 236 can be omitted to reduce the number of components of the liquid cooling plate 23 and reduce costs.

[0136] When the liquid cooling plate 23 is applied to the battery pack 20, the multiple cells 22 in the battery pack 20 form multiple rows of cells arranged along the width direction Y. Figure 12 For adopted Figure 7 A partial structural diagram of the battery pack 20 with liquid cooling plate 23 in the middle, wherein, Figure 12 The battery pack 20 in the image shows four rows of cells arranged along the width direction Y, one row of cells shows multiple cells 22 arranged along the length direction X, and the remaining rows of cells show only one cell 22.

[0137] For example, if the flow channel groove 2321 on the flow channel plate 232 adopts the second layout, combined with Figure 8 and Figure 12As shown, each row of cells in the multi-row battery cell array corresponds to a row of flow channel slots; in the height direction Z, each cell 22 is positioned above a corresponding flow channel slot 2321.

[0138] Figure 13 for Figure 12 One of the partial structural diagrams of the battery pack 20 in the diagram, as shown below. Figure 13 As shown, the projection of one cell 22 in each row of cells onto the flow channel plate 232 covers one flow channel groove 2321 in a row of flow channel grooves. In this way, the flow channel groove 2321 under each cell 22 can cool down the cell 22, improve the temperature uniformity of multiple cells 22, and the number of flow channel grooves 2321 in each row of flow channel grooves can be determined according to the number of cells 22 in each row of cells.

[0139] For example, if the flow channel groove 2321 on the flow channel plate 232 adopts the second layout, Figure 14 for Figure 12 The second schematic diagram of the partial structure of the battery pack 20, combined with... Figure 12 and Figure 14 As shown, in at least one row of cells in the battery pack 20, some cells in that row correspond one-to-one with the flow channel grooves 2321, while others use multiple cells corresponding to one flow channel groove 2321. That is, besides one flow channel groove 2321 corresponding to one cell 22, one flow channel groove 2321 can also correspond to multiple cells 22. In other words, the coolant in one flow channel groove 2321 can be used to simultaneously cool multiple cells 22. This reduces the number of flow channel grooves 2321 in that row, lowers the processing difficulty of the flow channel plate 232, and reduces production costs.

[0140] As another example, if the flow channel grooves 2321 on the flow channel plate 232 adopt the second layout, in at least one row of cells in the multi-row cells of the battery pack 20, multiple cells in that row correspond to one flow channel groove 2321. That is, in that row of cells, one flow channel groove 2321 corresponds to multiple cells 22 (for example, each flow channel groove 2321 corresponds to two cells 22). This arrangement can also reduce the number of flow channel grooves 2321 in that row, reduce the processing difficulty of the flow channel plate 232, and reduce production costs.

[0141] When the liquid cooling plate 23 includes multiple inlet channels 2331 and multiple return channels 2341, the multiple inlet channels 2331 and multiple return channels 2341 of this application can be arranged alternately or non-alternately. The following will illustrate the arrangement of the multiple inlet channels 2331 and multiple return channels 2341 with examples. It should be understood that the arrangement of the multiple inlet channels 2331 and multiple return channels 2341 illustrated below applies to both the first layout of the channel grooves 2321 on the channel plate 232 and the second layout of the channel grooves 2321 on the channel plate 232.

[0142] (1) The first arrangement of multiple inlet channels 2331 and multiple return channels 2341: the channel located on the outermost side of the width direction Y is the inlet channel 2331; along the width direction Y, in the pair of outermost channels and the other pair of adjacent channels, the return channel 2341 in the pair of outermost channels is adjacent to the inlet channel 2331 in the other pair of channels.

[0143] That is, the flow channels on both sides of the width direction Y of the liquid cooling plate 23 are all water inlet channels 2331. Since the water inlet channels 2331 are used to supply cold water, when a cold water supply source supplies cold water into the corresponding water inlet channels 2331 of multiple pairs of flow channels, this application sets the outermost flow channels along the width direction Y as water inlet channels 2331. The path that the cold water supply source takes when connecting to each water inlet channel 2331 is longer, which can improve the heat dissipation effect of the liquid cooling plate 23. In addition, since the outermost flow channel in the width direction Y is the inlet flow channel 2331, and the multiple return flow channels 2341 are all located between the two outermost inlet flow channels 2331 in the width direction Y, the multiple return flow channels 2341 are more densely distributed than the multiple inlet flow channels 2331. When hot water is discharged, the return water path discharged by the multiple return flow channels 2341 is shorter than the path taken when the cold water supply source is connected to each inlet flow channel 2331. Therefore, the layout method adopted in this application can increase the length of the cold water path and reduce the length of the hot water path, which is beneficial to improving the heat dissipation effect of the liquid cooling plate 23.

[0144] Figure 15 This is one of the liquid flow path topologies of the liquid cooling plate 23 provided in the embodiments of this application. Figure 16 This is the second liquid flow path topology diagram of the liquid cooling plate 23 provided in the embodiments of this application. When the flow channels at the beginning and end of the width direction Y are both water inlet channels 2331, the newly added water inlet path formed by the path before the cold water supply source supplies cold water into each water inlet channel 2331 can be referred to Figure 15 As shown in the dashed box on the left (or refer to...) Figure 16 (As shown in the dashed box on the left), the return water path after the multiple return water channels 2341 are combined can be referenced. Figure 15 As shown in the dashed box on the right (or Figure 16 As shown in the dashed box on the right, it can be seen that the length of the inlet path in the dashed box on the left is significantly greater than the length of the return path in the dashed box on the right.

[0145] When both the starting and ending channels along the width direction Y of the multiple inlet channels 2331 and multiple return channels 2341 are inlet channels 2331, this application does not impose specific restrictions on the arrangement of other channels between the starting and ending channels along the width direction Y, as long as each inlet channel 2331 is adjacent to at least one return channel 2341 and an inlet channel 2331 and an adjacent return channel 2341 can form a pair of channels.

[0146] (2) The second arrangement of multiple inlet channels 2331 and multiple return channels 2341: along the width direction Y, multiple inlet channels 2331 and multiple return channels 2341 are alternately distributed.

[0147] That is, along the width direction Y, there is a return water channel 2341 between every two adjacent inlet water channels 2331, and a source water channel 2331 between every two adjacent return water channels 2341. When multiple inlet water channels 2331 and multiple return water channels 2341 are arranged in this layout, the hot and cold water distribution is more uniform because the inlet water channels 2331 and return water channels 2341 are arranged alternately, which can reduce the temperature difference of the liquid cooling plate 23 and improve the temperature uniformity of various areas of the liquid cooling plate 23.

[0148] Figure 17 This is the third liquid flow path topology diagram of the liquid cooling plate 23 provided in the embodiments of this application. Figure 18 This is the fourth liquid flow path topology diagram of the liquid cooling plate 23 provided in the embodiments of this application. When the inlet channel 2331 and the return channel 2341 are alternately distributed, from the reference... Figure 17 or Figure 18 It can be seen that the hot and cold water flow paths of the liquid cooling plate 23 are relatively evenly distributed.

[0149] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. The above description is merely a specific embodiment 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 liquid-cooled plate, characterized in that, It includes a substrate, a flow channel plate, multiple inlet channels, and multiple return channels; among which, In the height direction of the liquid cooling plate, the substrate is located on the upper surface of the flow channel plate, and the multiple inlet water channels and the multiple return water channels are all located on the lower surface of the flow channel plate; The multiple inlet channels and the multiple return channels extend along the length of the liquid cooling plate; the multiple inlet channels and the multiple return channels include multiple pairs of inlet channels and return channels, and each pair of inlet channels and return channels is adjacent to each other in the width direction of the liquid cooling plate. The flow channel plate is provided with multiple water inlet holes and multiple water return holes. The multiple water inlet holes and multiple water return holes are distributed at intervals along the length direction. The water inlet channel in a pair of water inlet channels and water return channels is connected to each of the multiple water inlet holes. The water return channel in a pair of water inlet channels and water return channels is connected to each of the multiple water return holes. The upper surface of the flow channel plate is provided with a flow channel groove, and one or more of the plurality of water inlet holes and one or more of the plurality of water return holes are disposed at the bottom of the flow channel groove. The flow channel groove is used to connect the pair of water inlet channels and water return channels.

2. The liquid cooling plate according to claim 1, characterized in that, The upper surface of the flow channel plate is provided with multiple flow channel grooves, which are arranged side by side along the width direction and each flow channel groove extends along the length direction; the multiple water inlet holes and the multiple water return holes are all located at the bottom of one flow channel groove, and the pair of water inlet channels and water return channels are connected to one flow channel groove through the multiple water inlet holes and the multiple water return holes.

3. The liquid cooling plate according to claim 2, characterized in that, The bottom of the flow channel has a plurality of first protrusions protruding in the direction toward the substrate; the plurality of first protrusions are located between the plurality of water inlets and the plurality of water returnlets and are spaced apart along the length direction.

4. The liquid cooling plate according to claim 1, characterized in that, The upper surface of the flow channel plate is provided with multiple rows of flow channel grooves, which are arranged side by side along the width direction. Each row of flow channel grooves includes multiple flow channel grooves arranged along the length direction. The inlet flow channel in the pair of inlet flow channels and return flow channels is connected to a row of flow channel grooves through multiple inlet holes, and the return flow channel in the pair of inlet flow channels and return flow channels is connected to a row of flow channel grooves through multiple return holes.

5. The liquid cooling plate according to claim 4, characterized in that, Each of the flow channels has a water inlet hole and a water return hole at its bottom.

6. The liquid cooling plate according to claim 4, characterized in that, A portion of the multiple flow channels are provided with multiple water inlet holes at the bottom, while another portion of the multiple flow channels is provided with one water inlet hole at the bottom. Alternatively, a portion of the multiple flow channels may have multiple return water holes at the bottom, while another portion of the multiple flow channels may have one return water hole at the bottom. Alternatively, the diameter of the water inlet hole at the bottom of a portion of the multiple flow channels is not equal to the diameter of the water inlet hole at the bottom of another portion of the multiple flow channels. Alternatively, the diameter of the return water hole at the bottom of a portion of the multiple flow channels is not equal to the diameter of the return water hole at the bottom of another portion of the multiple flow channels.

7. The liquid cooling plate according to claim 4, characterized in that, Each of the flow channels has a second protrusion protruding along the inside of the flow channel.

8. The liquid cooling plate according to claim 4, characterized in that, The liquid cooling plate also includes a baffle plate; in the height direction, the baffle plate is located on the lower surface of the flow channel plate, and the baffle plate covers the upper surfaces of the plurality of inlet channels and the plurality of return channels; The baffle plate is provided with a plurality of first through holes and a plurality of second through holes, which are distributed at intervals along the length direction. The water inlet channel in the pair of water inlet channels and the water return channel are connected to the plurality of water inlet holes through the plurality of first through holes, and the water return channel in the pair of water inlet channels and the water return channel are connected to the plurality of water return holes through the plurality of second through holes.

9. The liquid-cooled plate according to any one of claims 1-8, characterized in that, The outermost channel in the width direction is the water inlet channel; Along the width direction, in the outermost pair of inlet and return water channels and the adjacent pair of inlet and return water channels, the return water channel in the outermost pair of inlet and return water channels is adjacent to the inlet water channel in the other pair of inlet and return water channels.

10. The liquid-cooled plate according to any one of claims 1-8, characterized in that, Along the width direction, multiple inlet channels and multiple return channels are alternately distributed.

11. A battery pack, characterized in that, The device includes a housing, a plurality of battery cells, and a liquid cooling plate as described in any one of claims 1-10, wherein the liquid cooling plate and the plurality of battery cells are disposed within the housing, and the plurality of battery cells are fixed to the upper surface of the substrate in the liquid cooling plate.

12. The battery pack according to claim 11, characterized in that, The upper surface of the flow channel plate is provided with multiple flow channel grooves, which are arranged side by side along the width direction and each flow channel groove extends along the length direction; the multiple water inlet holes and the multiple water return holes are all located at the bottom of one flow channel groove, and the pair of water inlet channels and water return channels are connected to one flow channel groove through the multiple water inlet holes and the multiple water return holes; The multiple battery cells form multiple rows of battery cells arranged along the width direction; each row of battery cells corresponds to one flow channel groove. In the height direction, each row of cells is positioned above the corresponding flow channel groove.

13. The battery pack according to claim 11, characterized in that, The upper surface of the flow channel plate is provided with multiple rows of flow channel grooves, which are arranged side by side along the width direction. Each row of flow channel grooves includes multiple flow channel grooves arranged along the length direction. The inlet flow channel in the pair of inlet flow channels and return flow channels is connected to a row of flow channel grooves through multiple inlet holes, and the return flow channel in the pair of inlet flow channels and return flow channels is connected to a row of flow channel grooves through multiple return holes. The multiple battery cells form multiple rows of battery cells arranged along the width direction; each row of battery cells corresponds to one row of the flow channel grooves; In the height direction, each of the cells is positioned above a corresponding flow channel groove.

14. An energy storage cabinet, characterized in that, It includes a housing and a plurality of battery packs as described in any one of claims 11-13, wherein the plurality of battery packs are stacked in the housing.

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