Liquid cooling plate, battery pack and energy storage device

Abstract

The embodiment of the application provides a liquid cooling plate, a battery pack and an energy storage device. The liquid cooling plate is formed by laminating a bottom plate, a flow channel plate and a substrate. A first type of flow channel is formed between the substrate and the flow channel plate, and a second type of flow channel is formed between the bottom plate and the flow channel plate. A plurality of first flow channels included in the first type of flow channel and a plurality of second flow channels included in the second type of flow channel are alternately arranged, so that adjacent first flow channels and second flow channels share a flow channel wall. The flow channel walls of the plurality of second flow channels are welded to the substrate, so that the cooling liquid in the second flow channel can also exchange heat with the battery cells arranged on the substrate through the substrate. In combination with the first flow channel, the battery cells can also exchange heat, so that the effective refrigeration area of the liquid cooling plate for heat dissipation of the battery cells is effectively increased, thereby effectively improving the heat dissipation effect of the battery cells arranged on the substrate, improving the heat dissipation performance of the battery pack, and further improving the operation stability and safety of the battery pack.

Description

Technical Field

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

[0002] The battery pack in the relevant technology includes a liquid cooling plate and battery cells mounted on the liquid cooling plate. In order to improve the cooling effect on the battery cells, it is usually necessary to supply coolant at a lower temperature into the liquid cooling plate. This requires the liquid cooling unit used to supply the coolant to have a greater cooling effect, which in turn requires the liquid cooling unit to have greater power and volume. This also leads to large energy loss and high volume occupancy of the liquid cooling unit. When the heat dissipation of the battery cells is insufficient, it will affect the operational stability and safety of the battery pack. Utility Model Content

[0003] The embodiments of this application provide a liquid cooling plate, a battery pack, and an energy storage device. In this embodiment, without increasing the energy consumption and volume of the liquid cooling unit used to supply coolant to the liquid cooling plate, the liquid cooling plate can also meet the heat dissipation requirements of the battery cells, thereby improving the operational stability and safety of the battery pack.

[0004] In a first aspect, embodiments of this application provide a liquid cooling plate, comprising a substrate, a flow channel plate, and a bottom plate stacked in the thickness direction of the liquid cooling plate; in the thickness direction, the upper surface of the flow channel plate has multiple first flow channel grooves, and the lower surface of the flow channel plate has multiple second flow channel grooves; the upper surface of the flow channel plate is attached to the substrate and seals the multiple first flow channel grooves to form multiple first flow channels, and the lower surface of the flow channel plate is attached to the bottom plate and seals the multiple second flow channel grooves to form multiple second flow channels; in the width direction of the liquid cooling plate, the multiple first flow channels and the multiple second flow channels are arranged alternately; a third flow channel is located at one end in the length direction of the liquid cooling plate and extends in the width direction, the multiple first flow channels are all connected to the third flow channel, the multiple second flow channels are all connected to the third flow channel, and the flow direction of the multiple first flow channels is opposite to the flow direction of the multiple second flow channels. It can be understood that the flow direction refers to the direction in which the coolant flows within the flow channel.

[0005] In this embodiment, since multiple first and second flow channels are connected through a third flow channel, they share the same coolant. This avoids temperature differences caused by different coolants and effectively controls and reduces the temperature difference of the coolant within the multiple first and second flow channels. Furthermore, because the multiple first and second flow channels are arranged alternately in the width direction and separated by a flow channel plate on both sides, the lower surface of the flow channel plate can be fully utilized while reducing the connection area between the upper surface of the flow channel plate and the substrate. Through the contact between the coolant and the lower surface of the flow channel plate, the overall contact area between the flow channel plate and the coolant is increased, thereby improving the cooling capacity of the liquid cooling plate. This effectively improves the heat dissipation capacity of the battery pack in this embodiment, and also effectively enhances the operational stability and safety of the battery pack.

[0006] In some embodiments, the flow channel plate is stamped to form the plurality of first flow channel grooves and the plurality of second flow channel grooves, with one first flow channel groove sharing a portion of the flow channel plate with two second flow channel grooves on adjacent sides in the width direction. In this embodiment, since one first flow channel groove shares a portion of the flow channel plate with two second flow channel grooves on adjacent sides in the width direction, the first and second flow channel grooves are arranged adjacent to each other, that is, the first and second flow channels share a flow channel wall. Therefore, the coolant in the first and second flow channels can fully exchange heat through the shared flow channel wall, which can effectively reduce the temperature difference of the coolant in the plurality of first and second flow channels. This results in uniform heat dissipation of the multiple cells on the liquid cooling plate in this embodiment, good temperature uniformity between the cells, effectively reducing the risk of thermal runaway of the cells, and thus improving the operational stability and safety of the battery pack.

[0007] In some embodiments, the upper surface of the flow channel plate includes the outer surface of the bottom wall of the first flow channel groove, and the outer surface of the bottom wall of the second flow channel groove is in contact with the substrate. In this embodiment, the area occupied by the first flow channel of the flow channel plate is an effective cooling area that can effectively dissipate heat from the battery cell because coolant flows through the first flow channel. Furthermore, the upper surface of the flow channel plate between two adjacent first flow channels is part of the outer surface of the bottom wall of the second flow channel groove, and this part is in contact with the substrate. Thus, the coolant in the second flow channel can also conduct cold energy to the battery cell through the bottom wall of the second flow channel groove and the substrate to cool and dissipate heat from the battery cell. In other words, the upper surface of the flow channel plate between two adjacent first flow channels can also be used to cool the battery cell disposed thereon. Thus, the area occupied by the first flow channel of the liquid cooling plate and the area occupied by the part between two adjacent first flow channels in the width direction can effectively cool the battery cell. Both are effective cooling areas of the liquid cooling plate, which greatly increases the effective cooling area of ​​the liquid cooling plate in this embodiment, thereby greatly improving the cooling capacity of the liquid cooling plate. This effectively improves the heat dissipation capacity of the battery pack in this embodiment, and also effectively improves the operational stability and safety of the battery pack.

[0008] In some embodiments, the flow channel plate has through holes that connect multiple first and third flow channels. In this embodiment, multiple first and second flow channels can be connected through the through holes and the third flow channel, thus achieving connectivity between the multiple first and second flow channels. Furthermore, during the manufacturing of the flow channel plate, through holes can be pre-machined on the flow channel plate, thereby simplifying the manufacturing process of the liquid cooling plate while achieving connectivity between the multiple first and second flow channels.

[0009] In some embodiments, the through-hole is located at the end of the flow direction of the multiple first flow channels. Since the through-hole is located at the end of the flow direction of the multiple first flow channels, the coolant in the first flow channel can be smoothly transported from the beginning to the end of the flow direction, and then transported to the multiple second flow channels through the through-hole, so that the coolant can be stably in a flowing state at each position in the multiple first flow channels, thereby ensuring the fluidity of the coolant.

[0010] In some embodiments, multiple first flow channel grooves extend along the length of the liquid cooling plate to the through hole and communicate with it. In this embodiment, since multiple first flow channel grooves extend along the length of the liquid cooling plate to the through hole and communicate with it, multiple first flow channels can be connected to the through hole, and ultimately connected to the liquid inlet flow channel through the through hole. Moreover, the end of the flow direction of the formed first flow channel is the location of the through hole, so the coolant in the first flow channel can be smoothly delivered from the beginning to the end of the flow direction, so that the coolant can be stably in a flowing state at all positions in the multiple first flow channels, thereby ensuring the fluidity of the coolant.

[0011] In some embodiments, a base plate covers the side of the flow channel plate facing the base plate to form a third flow channel. The third flow channel is located at the starting end of the flow direction of the multiple second flow channels and is connected to the multiple second flow channels. In this embodiment, since the coolant from the multiple first flow channels is first delivered to the third flow channel and then distributed from the third flow channel to the multiple second flow channels, the multiple first flow channels and the multiple second flow channels can be connected in parallel. This reduces the temperature difference of the coolant in the multiple first flow channels and also reduces the temperature difference of the coolant in the multiple second flow channels, thereby improving the temperature uniformity of the liquid cooling plate.

[0012] In some embodiments, a base plate is disposed on the lower surface of the flow channel plate, and the base plate and the lower surface of the flow channel plate together enclose the area on one side of the starting end of the flow direction of the multiple second flow channels in the longitudinal direction to form a third flow channel. In this embodiment, during the processing of the flow channel plate, the outflow area on the lower surface of the flow channel plate located on one side of the starting end of the flow direction of the multiple second flow channels in the longitudinal direction can be formed in conjunction with the base plate to form the third flow channel, which can reduce the difficulty of forming the third flow channel.

[0013] In some embodiments, the area on the lower surface of the base plate and the flow channel plate located at the end of the flow direction of the multiple second flow channels in the longitudinal direction together forms a liquid outlet flow channel, which is used to communicate with the liquid outlet of the liquid cooling plate. In this embodiment, during the processing of the flow channel plate, the outflow area located at the end of the flow direction of the multiple second flow channels in the longitudinal direction on the lower surface of the flow channel plate can be formed by cooperating with the base plate to form the liquid outlet flow channel, which can reduce the difficulty of forming the liquid outlet flow channel. Moreover, since the liquid outlet flow channel and the third flow channel are located at both ends in the longitudinal direction of the multiple second flow channels, it is convenient to connect the multiple second flow channels with the third flow channel and the liquid outlet flow channel, making the flow channel design within the liquid cooling plate more reasonable.

[0014] In some embodiments, multiple first flow channel grooves are arranged at intervals along the width direction. The outer walls of the multiple first flow channel grooves protrude from the lower surface of the flow channel plate towards the bottom plate. The outer walls of any two adjacent first flow channel grooves are spaced apart in the width direction to form a second flow channel groove. The lower surface of the flow channel plate between the outer walls of two adjacent first flow channel grooves constitutes the inner surface of the bottom wall of the second flow channel groove. The bottom plate is disposed on the outer surface of the bottom wall of the multiple first flow channel grooves and covers the multiple second flow channel grooves to form multiple second flow channels. In this embodiment, since the second flow channel groove is formed by the groove walls of two adjacent first flow channel grooves, the second flow channel groove can be formed simultaneously when processing the flow channel plate and processing the first flow channel grooves, which improves the processing convenience of the flow channel plate. Moreover, the first flow channel groove and the second flow channel groove are equivalent to sharing a groove wall, which can effectively improve the heat exchange effect of the coolant in the first flow channel and the second flow channel, thereby reducing the temperature difference of the coolant in the multiple first flow channels and the multiple second flow channels in the liquid cooling plate.

[0015] In some embodiments, the base plate includes a flange formed by bending from its circumferential edge toward the flow channel plate, and the flange is connected to the edge of the lower surface of the flow channel plate. In this embodiment, although the outer surface of the bottom wall of the first flow channel groove and the lower surface of the second part are not on the same plane, specifically, the outer surface of the bottom wall of the first flow channel groove is lower than the lower surface of the second part, the liquid cooling plate in this embodiment can achieve both connection between the base plate and the outer surface of the bottom wall of the first flow channel groove, and connection between the base plate and the lower surface of the second part, due to the flange formed by bending the circumferential edge of the base plate toward the flow channel plate.

[0016] In some embodiments, the surface of the substrate facing the flow channel plate has a liquid inlet groove recessed in a direction away from the flow channel plate. The liquid inlet groove extends along the width direction, and a first surface covers the liquid inlet groove to form a liquid inlet channel. The liquid inlet channel is located on one side of the starting end of the flow direction of multiple first channels in the length direction, and the starting ends of the multiple first channels extend to and communicate with the liquid inlet channel. The liquid inlet channel is used to communicate with the liquid inlet of the liquid cooling plate. In this embodiment, since the liquid inlet channel is located on one side of the starting end of the flow direction of multiple first channels in the length direction, and the starting ends of the multiple first channels extend to and communicate with the liquid inlet channel, not only can the number of channels in the liquid cooling plate be reduced, reducing the difficulty of channel layout, but also multiple first channels can be arranged in parallel through the liquid inlet channel, which can improve the temperature uniformity of the coolant in the multiple first channels.

[0017] In some embodiments, the inlet and outlet channels are arranged in the thickness direction. Both the inlet and outlet of the liquid-cooled plate are located on the substrate. The inlet is directly opposite the inlet channel in the thickness direction, penetrates the channel plate, and communicates with the inlet channel. Similarly, the outlet is directly opposite both the inlet and outlet channels in the thickness direction, penetrates both the substrate and the channel plate, and communicates with the outlet channel. In this embodiment, because the inlet and outlet channels are arranged in the thickness direction, and both the inlet and outlet of the liquid-cooled plate are located on the substrate directly opposite the inlet channel, this vertically aligned connection achieves the shortest and lowest-resistance path for the coolant from the external piping to the inlet and outlet channels, effectively optimizing flow and heat dissipation performance. Furthermore, all external water pipe connections are concentrated on the same side of the liquid-cooled plate, facilitating centralized arrangement and routing of external piping, resulting in a cleaner and more compact layout within the entire energy storage device.

[0018] In some embodiments, each of the multiple first flow channels is adjacent to at least one second flow channel in the width direction. In this embodiment, since each of the multiple first flow channels is adjacent to at least one second flow channel in the width direction, that is, the multiple first flow channels and multiple second flow channels are arranged in an approximately ABAB... pattern along the width direction. This allows the coolant in each first flow channel to exchange heat with the coolant in the adjacent second flow channel, improving the temperature uniformity of the coolant in the liquid cooling plate. Moreover, the portion between every two first flow channels can also be used to form a second flow channel, which can effectively increase the effective cooling area of ​​the liquid cooling plate. It is understood that in some other embodiments, the multiple first flow channels and multiple second flow channels may be arranged in other ways along the width direction.

[0019] In some embodiments, the substrate and the flow channel plate are welded or bonded with thermally conductive adhesive on the side facing the substrate, and the bottom plate and the flow channel plate are welded or bonded with thermally conductive adhesive on the side facing the bottom plate. In this embodiment, the liquid cooling plate is formed by welding or bonding the substrate and the flow channel plate, and by welding or bonding the bottom plate and the flow channel plate. This reduces the manufacturing difficulty of the flow channels within the liquid cooling plate and allows for a more rational flow channel layout.

[0020] Secondly, embodiments of this application provide a battery pack, which includes a plurality of battery cells and a liquid cooling plate as described in any of the first aspects above, wherein the plurality of battery cells are disposed on a substrate.

[0021] In some embodiments, in the thickness direction, any one of the plurality of cells is directly opposite the first flow channel and the second flow channel.

[0022] Thirdly, embodiments of this application provide an energy storage device, which includes a liquid cooler unit and a battery pack as described in the second aspect. The liquid cooler unit is connected to the inlet and outlet of a liquid cooling plate, and is used to deliver coolant to the liquid cooling plate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of a portion of the liquid cooling plate structure in related technologies; Figure 3 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application; Figure 4 for Figure 3 A schematic diagram of the liquid cooling plate in the battery pack in the embodiment; Figure 5 for Figure 4 A schematic cross-sectional view of the liquid cooling plate along its length in the embodiment; Figure 6A for Figure 4 A cross-sectional schematic diagram of the liquid cooling plate in the width direction in the embodiment; Figure 6B for Figure 4 A perspective view of a portion of the liquid cooling plate structure in the embodiment; Figure 7 for Figure 4 An exploded view of the liquid cooling plate in the embodiment; Figure 8 for Figure 7 A schematic diagram of the substrate in the embodiment from a bottom-view perspective; Figure 9 for Figure 7 A schematic diagram of the flow channel plate in the embodiment from a bottom view; Figure 10 for Figure 4 Another cross-sectional view of the liquid cooling plate in the width direction in the embodiment; Figure 11 for Figure 4 Another cross-sectional view of the liquid cooling plate along its length in the embodiment; Figure 12A A perspective view of another liquid cooling plate provided in an embodiment of this application; Figure 12B for Figure 12A A schematic diagram of the flow channel plate in the embodiment; Figure 13 Here are simplified diagrams of three more liquid cooling plates provided in the embodiments of this application.

[0025] Explanation of reference numerals in the attached figures: X: Length direction; Y: Width direction; Z: Thickness direction; 1000. Energy storage equipment; 100. Cabinet; 200. Liquid cooling unit; 300. Battery pack; 400, Liquid cooling plate; 500, Housing; 600, Battery cell; 10. Substrate; 11. Liquid inlet tank; 20. Flow channel plate; 201. Liquid inlet; 202. Liquid outlet; 21. Groove; 23. First part; 231. Upper surface of the first part; 232. Lower surface of the first part; 24. Second part; 241. Upper surface of the second part; 242. Lower surface of the second part; 243. Part one; 244. Part two; 245. Part three; 246. Part four; 25. Through hole; 251. Opening; 261. First surface; 262. Second surface; 27. First flow channel groove; 271. Wall of the first flow channel groove; 272. Bottom wall of the first flow channel groove; 28. Second flow channel groove; 30. Base plate; 31. Folded edge; 41. Water inlet; 42. Water outlet; 401. Type I flow channel; 402. First flow channel; 4021. Start end of the first flow channel; 4022. End end of the first flow channel; 403. Type II flow channel; 404. Second flow channel; 4041. Start end of the second flow channel; 4042. End end of the second flow channel; 405. Third flow channel; 406. Inlet flow channel; 407. Outlet flow channel; 50. Bumps. Detailed Implementation

[0026] The following section will first explain some of the terms used in the embodiments of this application.

[0027] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] In this specification, the terms "vertical" and "parallel" are explained.

[0029] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0030] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, allowing for situations where the parallelism is not absolute due to factors such as assembly tolerances, design tolerances, and structural flatness. These situations may lead to the sliding mating part and the first door panel not being absolutely parallel, but this application also defines such situations as parallelism.

[0031] Modern society is filled with a vast number of devices that rely on electricity, from small household appliances to large data centers and factory production lines. Electricity supply has become one of the factors that maintain the normal operation of modern society. Therefore, energy storage devices have developed rapidly and are widely used. Figure 1 This is a schematic diagram of the structure of an energy storage device 1000 provided in an embodiment of this application. The energy storage device 1000 can be an energy storage cabinet using a battery pack 300, a power cabinet for a data center, or even a vehicle using a battery pack 300. The energy storage device 1000 can be used to store electrical energy and to supply power to equipment that requires electricity. The energy storage device 1000 can be applied in fields such as site energy, photovoltaics, residential energy storage, industrial and commercial energy storage, and large-scale ground power station energy storage.

[0032] The energy storage device 1000 includes a cabinet 100 and a liquid cooling unit 200 and a battery pack 300 housed within the cabinet 100. The liquid cooling unit 200 and the battery pack 300 are the core components of the energy storage device 1000. The liquid cooling unit 200 supplies coolant to the liquid cooling plate 400 of the battery pack 300 to cool and dissipate heat. With the development of the energy storage device 1000, safety has become paramount. As the core component of the energy storage device 1000, the safety performance of the battery pack 300 determines the overall safety performance of the energy storage device 1000. Furthermore, the heat dissipation capacity of the battery pack 300 significantly affects its safety; better heat dissipation results in better operational stability and higher safety for the battery pack 300.

[0033] To improve the heat dissipation capacity of the battery pack 300, some battery packs 300 in related technologies typically increase the cooling capacity of the liquid cooling unit 200, such as by increasing the power of the compressor of the liquid cooling unit 200, so as to lower the temperature of the coolant supplied to the liquid cooling plate 400 of the battery pack 300, thereby improving the cooling and heat dissipation effect of the battery pack 300. However, this will lead to increased energy consumption and larger size of the liquid cooling unit 200, which will reduce the energy density of the energy storage device 1000.

[0034] Some liquid cooling plates 400 in related technologies (such as...) Figure 2It is typically composed of a substrate 10 and a flow channel plate 20 connected together. The flow channel plate 20 has a groove 21. The substrate 10 covers the groove 21 to form a flow channel, which is used for the flow of coolant. The portion 22 between the grooves 21 on the flow channel plate 20 (same as the first portion 23 below) needs to be welded to the substrate 10 to separate the grooves 21 and prevent coolant from flowing back.

[0035] In this embodiment, the battery pack 300 in the energy storage device 1000 improves the cooling capacity of the battery pack 300 by improving the structure of the liquid cooling plate 400. Specifically, it improves the utilization efficiency of the liquid cooling plate 400 for the coolant supplied by the liquid cooling unit 200, reduces cooling loss, and thus improves the cooling capacity of the battery pack 300. For example, it increases the contact area between the liquid cooling plate 400 and the coolant. For instance, it fully utilizes the portion 22 between the grooves 21 on the flow channel plate 20 in related technologies to make contact with the coolant, thereby increasing the effective area of ​​the liquid cooling plate 400 that can actually be used for cooling, and thus improving the cooling effect of the liquid cooling plate 400 on the battery pack 300.

[0036] To improve the heat dissipation capability of the battery pack 300, Figure 3 This is a schematic diagram of the structure of a battery pack 300 provided in an embodiment of this application.

[0037] Reference Figure 3 The battery pack 300 includes a housing 500, a liquid cooling plate 400, and multiple battery cells 600. The liquid cooling plate 400 can serve as the base plate of the housing 500, or it can be disposed on the base plate of the housing 500. The liquid cooling plate 400 supports the multiple battery cells 600 and dissipates heat from the multiple battery cells 600 located on the liquid cooling plate 400. Specifically, the liquid cooling plate 400 can have multiple rows of battery cells 600. Each row of battery cells 600 includes multiple battery cells 600 arranged along the length direction X of the liquid cooling plate 400, and the multiple rows of battery cells 600 are arranged along the width direction Y of the liquid cooling plate 400. It should be noted that the length direction X of the liquid cooling plate 400 is also the length direction X of the battery pack 300, the width direction Y of the liquid cooling plate 400 is also the width direction Y of the battery pack 300, and the thickness direction Z of the liquid cooling plate 400 is the height direction of the battery pack 300. For ease of description, the length direction X of the liquid cooling plate 400 will be used in the following text, and the width direction Y will be used in the following text, respectively. This embodiment, through a reasonable design of the structure of the liquid cooling plate 400, allows a larger area of ​​the liquid cooling plate 400 in contact with the battery cell 600 to come into contact with the coolant, thereby increasing the effective cooling area of ​​the liquid cooling plate 400. This improves the cooling effect of the liquid cooling plate 400 on the multiple battery cells 600 within the battery pack 300, and ultimately enhances the operational stability and safety of the battery pack 300.

[0038] Figure 4 for Figure 3A schematic diagram of the structure of the liquid cooling plate 400 in the battery pack 300 in the embodiment.

[0039] Reference Figure 4 The liquid cooling plate 400 includes a base plate 30, a flow channel plate 20, and a substrate 10 stacked sequentially from bottom to top along the thickness direction Z. The substrate 10 carries multiple battery cells 600 (e.g., ...). Figure 3 A flow channel is formed between the substrate 10 and the flow channel plate 20, and a flow channel can also be formed between the bottom plate 30 and the flow channel plate 20.

[0040] The substrate 10 and the flow channel plate 20 can be fixedly connected together by welding, bonding, or fasteners. For example, the flow channel plate 20 and the substrate 10 can be welded together, or they can be bonded together with thermally conductive adhesive. Similarly, the base plate 30 and the flow channel plate 20 can be fixedly connected together by welding, bonding, or fasteners. For example, the flow channel plate 20 and the base plate 30 can be welded together, or they can be bonded together with thermally conductive adhesive.

[0041] The liquid cooling plate 400 also includes an inlet nozzle 41 and an outlet nozzle 42. The inlet nozzle 41 is used to connect with the liquid cooling unit 200 (such as...). Figure 3 The output end of the liquid cooler is connected, and the water outlet 42 is used to connect with the input end of the liquid cooler unit 200, so that coolant can be delivered to the liquid cooling plate 400 through the liquid cooler unit 200.

[0042] Reference Figure 4 In some embodiments, the inlet nozzle 41 and the outlet nozzle 42 may be disposed on the substrate 10 and located at the same end in the longitudinal direction X, so as to facilitate connection with the liquid cooling unit 200 (e.g., Figure 3 The pipe connection is as follows. It is understood that in some other embodiments, the inlet nozzle 41 and the outlet nozzle 42 may also be located on both sides of the flow channel plate 20, for example, the inlet nozzle 41 is provided on the base plate 10 and the outlet nozzle 42 is provided on the flow channel plate 20.

[0043] To improve the performance of the liquid cooling plate 400 on the battery cell 600 (such as...) Figure 3 The effective cooling area, Figure 5 for Figure 4 A schematic cross-sectional view of the liquid cooling plate 400 along the length direction X in the embodiment.

[0044] Reference Figure 5 The flow channel formed between the substrate 10 and the flow channel plate 20 is a first type of flow channel 401. The first type of flow channel 401 includes multiple first flow channels 402, which are spaced apart in the width direction Y. For ease of description, the portion of the flow channel plate 20 located between any two adjacent first flow channels 402 in the width direction Y is the first portion 23.

[0045] The flow channel formed by the base plate 30 and the flow channel plate 20 is a second type of flow channel 403. The second type of flow channel 403 includes multiple second flow channels 404, which are spaced apart in the width direction Y. Since the multiple second flow channels 404 are spaced apart in the width direction Y, for ease of description, the portion of the flow channel plate 20 located between any two adjacent second flow channels 404 in the width direction Y is the second part 24.

[0046] The first type of flow channel 401 and the second type of flow channel 403 are arranged side by side in the width direction Y. For example, the multiple first flow channels 402 included in the first type of flow channel 401 and the multiple second flow channels 404 included in the second type of flow channel 403 are arranged alternately in the width direction Y. That is, any first flow channel 402 is necessarily adjacent to a second flow channel 404 in the width direction Y. Similarly, any second flow channel 404 is necessarily adjacent to a first flow channel 402 in the width direction Y. Because multiple first flow channels 402 and multiple second flow channels 404 are alternately arranged in the width direction Y, and the multiple first flow channels 402 and multiple second flow channels 404 are separated on both sides of the flow channel plate 20, the lower surface of the flow channel plate 20 can be fully utilized while reducing the connection area between the upper surface of the flow channel plate 20 and the substrate 10. Through the contact between the coolant and the lower surface of the flow channel plate 20, the overall contact area between the flow channel plate 20 and the coolant is increased, thereby improving the cooling capacity of the liquid cooling plate 400. This allows the battery pack 300 in this embodiment (such as...) to achieve the desired cooling performance. Figure 3 The heat dissipation capacity is effectively improved, and the operational stability and safety of the 300 battery pack are also effectively improved.

[0047] The first portion 23 of the flow channel plate 20 is used to connect to the substrate 10, for example, by welding the first portion 23 to the substrate 10, to achieve isolation between multiple first flow channels 402, so as to avoid crossflow between multiple first flow channels 402, and to ensure that the coolant flows evenly under each cell 600, thereby improving the uniformity of coolant flow distribution and improving the temperature uniformity of the liquid cooling plate 400 for heat dissipation from multiple cells 600. Simultaneously, the first portion 23 is part of the flow channel wall of the second flow channel 404, and in the thickness direction Z, the second flow channel 404 and the first portion 23 are directly opposite each other. In this embodiment, the area occupied by the first flow channel 402 of the flow channel plate 20, since coolant flows within the first flow channel 402, allows the liquid cooling plate 400 to cool the cells 600 (e.g., ...). Figure 3The effective heat dissipation area is achieved by using the first portion 23 between two adjacent first flow channels 402, which is part of the flow channel wall of the second flow channel 404 and is connected to the substrate 10. This allows the coolant in the second flow channel 404 to conduct heat to the battery cell 600 through the first portion 23 of the flow channel plate 20 and the substrate 10, thus cooling the battery cell 600. In other words, the first portion 23 of the liquid cooling plate 400 can also be used to cool the battery cell 600 disposed on the substrate 10, thereby increasing the effective heat dissipation area in the width direction Y. The area occupied by the first flow channel 402 of the cold plate 400 and the area occupied by the first part 23 between two adjacent first flow channels 402 can effectively cool the battery cell 600. These areas constitute the effective cooling area of ​​the liquid cooling plate 400. Compared to related technologies where the area occupied by the welded part 22 of the liquid cooling plate 400 cannot effectively cool the battery cell 600, the effective cooling area of ​​the liquid cooling plate 400 in this embodiment is greatly increased, thereby significantly improving the cooling capacity of the liquid cooling plate 400. This allows the battery pack 300 in this embodiment (e.g., ...) to achieve the desired cooling performance. Figure 3 The heat dissipation capacity is effectively improved, and the operational stability and safety of the 300 battery pack are also effectively improved.

[0048] Reference Figure 5 The first flow channel 402 and the second flow channel 404, which are adjacent in the width direction Y, share a common flow channel wall. For example, in some embodiments, the second flow channel 404 is formed by the outer flow channel walls of the two adjacent first flow channels 402, the first portion 23, and the base plate 30. Since the adjacent first flow channels 402 and the second flow channel 404 share a common flow channel wall, the coolant in the first flow channel 402 and the coolant in the second flow channel 404 can exchange heat through the shared flow channel wall to reduce the temperature difference between the coolant in the first flow channel 402 and the coolant in the second flow channel 404, thereby improving the temperature uniformity of the liquid cooling plate 400 in dissipating heat from the multiple battery cells 600. It is understandable that the second flow channel 404, which is located on the outermost side of the width direction Y, may be adjacent to only one first flow channel 402, that is, it shares the flow channel wall with only one first flow channel 402. However, the second flow channel 404 located in the middle part is adjacent to the first flow channel 402 on both sides of the width direction Y. The second flow channel 404 shares the flow channel wall with the two first flow channels 402 on both sides of the width direction Y.

[0049] Reference Figure 5 The second part 24 of the flow channel plate 20 is used to connect with the base plate 30, for example, by welding the second part 24 to the base plate 30, so as to achieve isolation between multiple second flow channels 404, so as to avoid crossflow between multiple second flow channels 404, so as to ensure that the coolant flows evenly under each cell 600, improve the uniformity of coolant flow distribution, and improve the temperature uniformity of the liquid cooling plate 400 for heat dissipation of multiple cells 600.

[0050] Reference Figure 5 The first type of flow channel 401 and the second type of flow channel 403 are located on both sides of the flow channel plate 20 in the thickness direction Z. Therefore, the first type of flow channel 401 and the second type of flow channel 403 can be sealed and isolated by the flow channel plate 20 to effectively prevent cross-flow of the first type of flow channel 401 and the second type of flow channel 403, so as to ensure that the coolant flows evenly under each cell 600 and improves the temperature uniformity of the liquid cooling plate 400.

[0051] Understandably, the stability and safety of the battery pack 300 are also greatly related to the temperature difference of the coolant in different locations within the liquid cooling plate 400. For example, the smaller the temperature difference between the coolant in the first type of flow channel 401 and the second type of flow channel 403, the better the heat uniformity of the battery cells 600 within the battery pack 300, and the better the operational stability and safety of the battery pack 300. Conversely, the larger the temperature difference between the coolant in the first type of flow channel 401 and the second type of flow channel 403, the worse the heat uniformity of the battery cells 600 within the battery pack 300, and the worse the operational stability and safety of the battery pack 300.

[0052] To improve the operational stability and safety of the battery pack 300, Figure 6A for Figure 4 A cross-sectional schematic diagram of the liquid cooling plate 400 in the width direction Y in the embodiment; Figure 6B for Figure 4 A perspective view of a portion of the structure of the liquid cooling plate 400 in the embodiment.

[0053] Reference Figure 6A and Figure 6B The first type of flow channel 401 of the liquid cooling plate 400 (such as...) Figure 5 ) and the second type of flow channel 403 (such as Figure 5 The first type of flow channel 401 is connected to the liquid inlet 201 of the liquid cooling plate 400 (e.g., Figure 7 The second type of flow channel 403 is connected to the liquid outlet 202 of the liquid cooling plate 400 (e.g., Figure 7The flow directions of the multiple first flow channels 402 included in the first type of flow channel 401 are opposite to those of the multiple second flow channels 404 included in the second type of flow channel 403. The flow direction of the flow channels is the direction of coolant flow within the flow channels. The liquid inlet 201 of the liquid cooling plate 400 is connected to the output end of the liquid cooling unit 200 through the water inlet 41, and the liquid outlet 202 of the liquid cooling plate 400 is connected to the input end of the liquid cooling unit 200 through the water outlet 42. This achieves the connection between the liquid cooling unit 200 and the first type of flow channels 401 and the second type of flow channels 403 of the liquid cooling plate 400. The coolant delivered by the liquid cooling unit 200 enters the first type of flow channel 401 from the liquid inlet 201 of the liquid cooling plate 400, then flows from the first type of flow channel 401 to the second type of flow channel 403, and finally flows back to the liquid cooling unit 200 from the liquid outlet 202 of the liquid cooling plate 400. In this embodiment, since the first type of flow channel 401 and the second type of flow channel 403 are connected, they share the same type of coolant. Therefore, the temperature difference caused by different types of coolant can be avoided, and the temperature difference of the coolant in the first type of flow channel 401 and the second type of flow channel 403 can be effectively controlled and reduced.

[0054] In addition, by Figure 5 As can be seen from the embodiments, since the multiple first flow channels 402 included in the first type of flow channel 401 and the multiple second flow channels 404 included in the second type of flow channel 403 are arranged alternately in the width direction Y, the portion of the flow channel plate 20 located between two adjacent first flow channels 402 in the width direction Y is used to connect with the substrate 10, and this portion of the flow channel plate 20 is part of the flow channel wall of the second flow channel 404. Therefore, the multiple first flow channels 402 and multiple second flow channels 404 are arranged adjacent to each other, and the first flow channels 402 and the second flow channels 404 share a common flow channel wall. Thus, the coolant in the first flow channel 402 and the coolant in the second flow channel 404 can fully exchange heat through the shared flow channel wall, which can effectively reduce the temperature difference between the coolant in the first type of flow channel 401 and the second type of flow channel 403. This makes the heat dissipation of the multiple cells 600 on the liquid cooling plate 400 in this embodiment uniform, and the temperature uniformity between each cell 600 is good. This can effectively reduce the risk of thermal runaway of the cell 600, thereby improving the operational stability and safety of the battery pack 300.

[0055] In order to make the first type of flow channel 401 (such as Figure 5 ) and the second type of flow channel 403 (such as Figure 5 Connect, refer to Figure 6A and Figure 6BThe flow channel plate 20 has through holes 25 that penetrate the flow channel plate 20, connecting multiple first flow channels 402 and multiple second flow channels 404 to achieve communication between the first type of flow channels 401 and the second type of flow channels 403. In this embodiment, during the manufacturing of the flow channel plate 20, the through holes 25 can be pre-machined on the flow channel plate 20. After the substrate 10 and the bottom plate 30 are connected to the flow channel plate 20 (e.g., welded), the first type of flow channels 401 and the second type of flow channels 403 can be connected through the through holes 25. This design can reduce the difficulty of connecting the first type of flow channels 401 and the second type of flow channels 403.

[0056] Reference Figure 6A and Figure 6B A third flow channel 405 is formed between the base plate 30 and the flow channel plate 20. The third flow channel 405 extends along the width direction Y of the liquid cooling plate 400. The third flow channel 405 is connected to multiple second flow channels 404 respectively. The third flow channel 405 is also connected to the through hole 25. Thus, multiple first flow channels 402 and multiple second flow channels 404 can be connected through the through hole 25 and the third flow channel 405. Specifically, the coolant in the multiple first flow channels 402 is transported to the third flow channel 405 through the through hole 25, and then transported to the multiple second flow channels 404 through the third flow channel 405. In this embodiment, since the coolant from multiple first flow channels 402 is first delivered to the third flow channel 405, and then distributed from the third flow channel 405 to multiple second flow channels 404, the multiple first flow channels 402 and the multiple second flow channels 404 can be connected in parallel. This reduces the temperature difference of the coolant in the multiple first flow channels 402 and the temperature difference of the coolant in the multiple second flow channels 404, thereby improving the temperature uniformity of the liquid cooling plate 400.

[0057] Reference Figure 6A and Figure 6B The through hole 25 and the third flow channel 405 are aligned in the thickness direction Z to facilitate communication between them. Furthermore, during machining, the through hole 25 can be machined using the third flow channel 405 as a reference to ensure the accuracy of the relative position between the third flow channel 405 and the through hole 25.

[0058] It is understood that in some other embodiments, the through hole 25 can penetrate the flow channel plate 20 along the width direction Y, thereby connecting adjacent first flow channels 402 and second flow channels 404. That is, two through holes 25 can be used to connect the first flow channel 402 with two adjacent second flow channels 404 simultaneously, or one through hole 25 can be used to connect only one first flow channel 402 with one adjacent second flow channel 404. In this embodiment, the third flow channel 405 may not be provided, and multiple first flow channels 402 and multiple second flow channels 404 can be connected.

[0059] Furthermore, in some other embodiments, multiple first flow channels 402 and multiple second flow channels 404 can be connected by external pipelines to realize the first type of flow channel 401 (e.g. Figure 5 ) and the second type of flow channel 403 (such as Figure 5 The connection between the first type of flow channel 401 and the second type of flow channel 403 can be achieved without opening a through hole 25 on the flow channel plate 20 or forming a third flow channel 405.

[0060] Reference Figure 6A and Figure 6B The third flow channel 405 is located at the end 4022 of the flow direction of multiple first flow channels 402, and also at the beginning 4041 of the flow direction of multiple second flow channels 404 (e.g., Figure 10 This not only facilitates the connection of the third flow channel 405 with multiple first flow channels 402 via through holes 25, but also facilitates the connection of the third flow channel 405 with multiple second flow channels 404. Furthermore, the coolant in the first flow channel 402 can be smoothly transported from the starting end 4021 to the ending end 4022, and then to the multiple second flow channels 404, ensuring that the coolant remains stably flowing in all positions within the multiple first flow channels 402, thus guaranteeing the fluidity of the coolant. Similarly, the third flow channel 405 is located at the starting end 4041 of the flow direction of the multiple second flow channels 404, while the ending end 4042 of the flow direction of the multiple second flow channels 404 is connected to the outlet 202 of the liquid cooling plate 400 (e.g., ...). Figure 7 The connection allows the coolant to flow stably at all positions within the multiple second flow channels 404, thus ensuring the fluidity of the coolant.

[0061] To facilitate the connection between multiple first flow channels 402 and the liquid inlet 201 of the liquid cooling plate 400 (e.g. Figure 7 The connectivity of ) is referenced. Figure 6A and Figure 6B A liquid inlet channel 406 is formed between the flow channel plate 20 and the substrate 10. The liquid inlet channel 406 is located at the starting end 4021 of the flow direction of the multiple first flow channels 402. The liquid inlet channel 406 extends along the width direction Y, thereby enabling the connection between the starting end 4021 of the flow direction of the multiple first flow channels 402 and the liquid inlet channel 406. This simplifies the structural design and processing difficulty of connecting the liquid inlet 201 of the liquid cooling plate 400 with the multiple first flow channels 402. Specifically, after the liquid inlet 201 of the liquid cooling plate 400 delivers coolant to the liquid inlet channel 406, the coolant in the liquid inlet channel 406 is distributed to the multiple first flow channels 402, so that the multiple first flow channels 402 are arranged in parallel, thereby effectively reducing the temperature difference of the coolant in the multiple first flow channels 402 and improving the performance of the liquid cooling plate 400 on the battery cell 600 (e.g., Figure 2 The uniformity of heat dissipation.

[0062] To facilitate the connection between multiple secondary flow channels 404 and the liquid outlet 202 of the liquid cooling plate 400 (e.g.) Figure 7 The connectivity of ) is referenced. Figure 6A and Figure 6B A liquid outlet channel 407 is formed between the flow channel plate 20 and the substrate 10. The liquid outlet channel 407 is located at the end 4042 of the flow direction of the multiple second flow channels 404. The liquid outlet channel 407 also extends along the width direction Y, so that the end 4042 of the flow direction of the multiple second flow channels 404 can be connected with the liquid outlet channel 407. This simplifies the structural design and processing difficulty of connecting the liquid outlet 202 of the liquid cooling plate 400 with the multiple second flow channels 404. Specifically, after the multiple second flow channels 404 deliver the coolant to the liquid outlet channel 407, the coolant is then delivered to the liquid outlet 202 of the liquid cooling plate 400 through the liquid outlet channel 407.

[0063] In order to form multiple first flow channels 402 (such as...) Figure 6A ), Figure 7 for Figure 4 An exploded view of the liquid cooling plate 400 in the embodiment.

[0064] Reference Figure 7 The flow channel plate 20 includes an upper surface facing the substrate 10 and a lower surface facing the bottom plate in the thickness direction Z. For ease of description, the upper surface of the flow channel plate 20 is designated as the first surface 261 and the lower surface of the flow channel plate is designated as the second surface 262.

[0065] The first surface 261 is provided with a plurality of first flow channel grooves 27 recessed toward the base plate 30. The plurality of first flow channel grooves 27 are arranged at intervals along the width direction Y. In some embodiments, the plurality of first flow channel grooves 27 extend along the length direction X of the liquid cooling plate 400. For example, in some embodiments, the extension direction of the plurality of first flow channel grooves 27 may be approximately parallel to the length direction X.

[0066] The multiple first flow channel grooves 27 on the flow channel plate 20 can be formed by various methods such as stamping, integral die casting or 3D printing.

[0067] Reference Figure 7 The first part 23 is the portion of the flow channel plate 20 between the two first flow channel grooves 27 in the width direction Y. The upper surface 231 of the first part 23 is the surface of the first part 23 facing the substrate 10. The upper surface 231 of the first part 23 is also part of the first surface 261. The upper surface 231 of the first part 23 is used to connect with the substrate 10, for example, by welding.

[0068] Reference Figure 7Since the flow channel plate 20 includes not only the first portion 23, but also a second portion 24 surrounding the plurality of first portions 23 and the plurality of first flow channel grooves 27, the second portion 24 is also the other part of the flow channel plate 20 except for the groove wall 271 of the first flow channel groove 27 and the first portion 23. That is to say, the flow channel plate 20 includes the first portion 23, the second portion 24 and the groove wall 271 of the first flow channel groove 27. The first surface 261 includes not only the upper surface 231 of the first portion 23, but also the upper surface 241 of the second portion 24. The upper surface 241 of the second portion 24 is the surface of the second portion 24 facing the substrate 10. It should be noted that in this embodiment, the first surface 261 does not include the inner surface of the first flow channel groove 27.

[0069] Reference Figure 5 and Figure 7 The substrate 10 is connected to and covers the first surface 261 of the flow channel plate 20, thereby enclosing the multiple first flow channel grooves 27 to form multiple first flow channels 402 (e.g., Figure 6A ).

[0070] Specifically, the substrate 10 can be connected to the upper surface 231 of the first portion 23 and the upper surface 241 of the second portion 24, respectively. It is understood that the substrate 10 is at least sealed at the edge of the upper surface 241 of the second portion 24 to prevent coolant leakage from flowing between the substrate 10 and the flow channel plate 20. In this embodiment, the substrate 10 is connected to the upper surface 231 of the first portion 23, for example, by brazing, which can connect multiple first flow channels 402 (such as...). Figure 6A The channels are separated to prevent cross-flow between multiple first channels 402, ensuring that the coolant flows evenly under each cell 600, improving the uniformity of coolant flow distribution, and improving the temperature uniformity of heat dissipation of multiple cells 600 by the liquid cooling plate 400.

[0071] Reference Figure 7 The first surface 261 is generally planar to facilitate a sealing connection between the first surface 261 and the substrate 10. It is understood that in some other embodiments, the first surface 261 may not be planar, or may not be entirely planar; for example, at least a portion of the first surface 261 may be curved.

[0072] Reference Figure 6A and Figure 7 Multiple first flow channel grooves 27 have through holes 25 at their ends extending toward the third flow channel 405, so that the flow end 4022 of the first flow channel 402 communicates with the through holes 25. Moreover, each first flow channel groove 27 has a corresponding through hole 25, so that each first flow channel 402 can communicate with the third flow channel 405 through the through hole 25.

[0073] Figure 8 for Figure 7 A schematic diagram of the substrate 10 in the embodiment from a bottom-view perspective.

[0074] Reference Figure 8 The substrate 10 has a liquid inlet groove 11 recessed in the direction away from the flow channel plate 20 on the surface facing the flow channel plate 20. The liquid inlet groove 11 extends along the width direction Y, and the first surface 261 of the flow channel plate 20 covers the liquid inlet groove 11 to form a liquid inlet flow channel.

[0075] Reference Figure 7 and Figure 8 The inlet channel is located at the end away from the through hole 25 along the extension direction of the multiple first flow channel grooves 27. The inlet groove 11 is directly opposite the end of the multiple first flow channel grooves 27 in the thickness direction Z, that is, opposite the starting end 4021 of the multiple first flow channels 402 (e.g., Figure 6A The inlet channel is directly opposite the multiple first flow channel grooves 27, so the portions corresponding to these grooves are uncovered, thus allowing the multiple first flow channel grooves 27 to interact with the inlet channel (such as...). Figure 6A The channels are interconnected so that the coolant in the inlet channel can be distributed and delivered to multiple first channel slots 27.

[0076] Reference Figure 8 The surface of the substrate 10 facing the flow channel plate 20 can be flat to facilitate bonding with the first surface 261. Of course, in some other embodiments, the surface of the substrate 10 facing the flow channel plate 20 can also be a curved surface consistent with the first surface 261.

[0077] Reference Figure 7 and Figure 8 In some embodiments, the entire surface of the substrate 10 facing the flow channel plate 20, except for the portion covering the multiple first flow channel grooves 27, is used to adhere to and seal the first surface 261 to ensure the sealing of the connection between the flow channel plate 20 and the substrate 10, preventing crossflow or leakage. It is understood that the surface of the substrate 10 facing the flow channel plate 20 does not include the inner surface of the inlet groove 11. Of course, in other embodiments, not all portions may be adhered to and sealed; for example, the upper surface 231 of the first portion 23 may not be completely adhered to the substrate 10, as long as the multiple first flow channels 402 (such as...) are sealed. Figure 6A It is sufficient to seal and isolate between them or to stream data at a relatively low flow rate.

[0078] Reference Figure 8The liquid inlet 201 and outlet 202 of the liquid cooling plate 400 are both formed on the substrate 10, so that the water inlet 41 and water outlet 42 are both mounted on the substrate 10. This facilitates centralized management of the water inlet 41 and water outlet 42, such as centralized installation or maintenance. Furthermore, it avoids distributing the pipes connected to the water inlet 41 and water outlet 42 on both sides of the liquid cooling plate 400, effectively improving space utilization efficiency in space-constrained situations. In addition, when the liquid cooling plate 400 serves as the housing 500 of the battery pack 300 (e.g., ...), Figure 3 When the base plate of the housing 500 is used as the base plate, the water inlet 41 and the water outlet 42 are placed on the base plate 10, which will not affect the normal assembly of the battery pack 300 when the liquid cooling plate 400 is used as the base plate of the housing 500.

[0079] Reference Figure 8 The liquid inlet 201 and outlet 202 of the liquid cooling plate 400 are located at the location of the liquid inlet channel, that is, in the thickness direction Z. The liquid inlet 201 and outlet 202 of the liquid cooling plate 400 are directly opposite the liquid inlet channel 406 to facilitate communication between the liquid inlet 201 and the liquid inlet channel. The outlet 202 is located at the location of the liquid inlet channel mainly to facilitate centralized management of the water inlet 41 and the water outlet 42. Moreover, since the liquid inlet channel is located at the end of the length direction X of the liquid cooling plate 400, it is also beneficial to manage the water inlet 41 and the water outlet 42.

[0080] It is understood that in some other embodiments, the liquid inlet 201 and the liquid outlet 202 may also be located at other positions on the liquid cooling plate 400. For example, the liquid inlet 201 may be located on the substrate 10, and the liquid outlet 202 may be located on the bottom plate 30.

[0081] Figure 9 for Figure 7 A schematic diagram of the flow channel plate 20 in the embodiment from a bottom view.

[0082] Figure 9 In this embodiment, the second surface 262 includes not only the lower surface 232 of the first portion 23, but also the lower surface 242 of the second portion 24. The lower surface 232 of the first portion 23 refers to the surface of the first portion 23 facing the base plate 30 (e.g., ...). Figure 7 The lower surface 242 of the second part 24 refers to the surface of the second part 24 facing the base plate 30. It is understood that the second surface 262 in this embodiment does not include the outer surface of the groove wall 271 of the first flow channel groove 27.

[0083] Reference Figure 9In this embodiment, since multiple first flow channels 402 and multiple second flow channels 404 are arranged alternately in the width direction, and a first flow channel 27 and two second flow channel channels 28 on adjacent sides in the width direction Y share a portion of the flow channel plate 20, the first flow channel 27 and the second flow channel 28 share a common flow channel wall. Therefore, the coolant in the first flow channel 402 and the coolant in the second flow channel 404 can fully exchange heat through the shared flow channel wall, which can effectively reduce the temperature difference of the coolant in the multiple first flow channels 402 and the multiple second flow channels 404, thereby enabling the multiple cells 600 (e.g., ...) on the liquid cooling plate 400 in this embodiment to achieve sufficient heat exchange. Figure 3 The heat dissipation is uniform, and the temperature uniformity between each 600 cell is good, which can effectively reduce the risk of thermal runaway of the 600 cell, thereby improving the performance of the 300 cells in the battery pack (such as...). Figure 3 The stability and security of operation.

[0084] Reference Figure 9 The walls 271 of any two adjacent first flow channel grooves 27 in the width direction Y form a second flow channel groove 28. That is, the space between two adjacent first flow channel grooves 27 in the width direction Y is the second flow channel groove 28. The second surface 262 between the walls 271 of two adjacent first flow channel grooves 27 constitutes the inner surface of the bottom wall of the second flow channel groove 28. That is, the lower surface 232 of the first part 23 is part of the inner surface of the bottom wall of the second flow channel groove 28. Specifically, the walls 271 of two adjacent first flow channel grooves 27 and the first part 23 together enclose the second flow channel groove 28. Therefore, the first flow channel groove 27 and the second flow channel groove 28 share a common wall.

[0085] Reference Figure 5 and Figure 9 The base plate 30 is disposed on the outer wall of the multiple first flow channel grooves 27 and covers the second flow channel grooves 28 to form multiple second flow channels 404. Specifically, the groove wall 271 of the first flow channel groove 27 includes the bottom wall 272 of the first flow channel groove 27. The outer surface of the bottom wall 272 of the first flow channel groove 27 is used to connect with the base plate 30, for example, by welding or bonding, so as to seal and isolate the multiple second flow channels 404 to prevent the coolant from flowing across the multiple second flow channels 404, so as to ensure that the coolant in the second flow channel 404 flows evenly under each cell 600, improves the uniformity of coolant flow distribution, and improves the temperature uniformity of heat dissipation of multiple cells 600 by the liquid cooling plate 400.

[0086] Reference Figure 5 and Figure 9 The substrate 10 contacts and connects with the outer surface of the bottom wall of the second flow channel 28. It can be understood that the outer surface of the bottom wall of the second flow channel 28 is also the upper surface 231 of the first part 23. By contacting and connecting the outer surface of the bottom wall of the second flow channel 28 with the substrate 10, efficient heat conduction can be achieved between the second flow channel 404 and the substrate 10. This allows the coolant in the second flow channel 404 to exchange heat with the battery cell 600 through the substrate 10, thereby achieving cooling and heat dissipation of the battery cell 600 by the second flow channel 404.

[0087] Reference Figure 7 and Figure 9 The base plate 30 is not only connected to the outer surface of the bottom wall 272 of the first flow channel 27, but also connected to the lower surface 242 of the second part 24. For example, the base plate 30 is sealed to the edge of the lower surface 242 of the second part 24 to prevent coolant leakage between the base plate 30 and the flow channel plate 20.

[0088] Reference Figure 7 and Figure 9 The base plate 30 includes a folded edge 31 formed by bending from the circumferential edge of the base plate 30 toward the flow channel plate 20, and the folded edge 31 is connected to the edge of the second surface 262. Although the outer surface of the bottom wall 272 of the first flow channel 27 is not on the same plane as the lower surface 242 of the second part 24, specifically, the outer surface of the bottom wall 272 of the first flow channel 27 is lower than the lower surface 242 of the second part 24, the liquid cooling plate 400 in this embodiment can achieve both connection between the base plate 30 and the outer surface of the bottom wall 272 of the first flow channel 27, and connection between the base plate 30 and the lower surface 242 of the second part 24, due to the folded edge 31 formed by bending from the circumferential edge of the base plate 30 toward the flow channel plate 20.

[0089] Reference Figure 9 The second part 24 is roughly ring-shaped. The part of the second part 24 located on the side of the multiple second flow channel grooves 28 with through holes 25 in the length direction X is part one 243. The part of the second part 24 located on the side of the multiple second flow channel grooves 28 away from the through holes 25 in the length direction X is part two 244. The two sides of the second part 24 in the width direction Y are part three 245 and part four 246, respectively. Part three 245 and part four 246 are located between part one 243 and part two 244 in the length direction X.

[0090] In order to form Figure 6A The water outlet channel in the embodiment refers to Figure 6A and Figure 9The liquid outlet channel 407 is formed by the area of ​​the second surface 262 located on one side of the end of the flow direction of the multiple second flow channels 404 in the length direction X, together with the area of ​​the second surface 262. That is, the liquid outlet channel 407 is formed by the bottom plate 30 and the lower surface of part of the second 244. In this embodiment, since the first flow channel 27 is recessed towards the bottom plate 30, and the second flow channel 28 is formed by two adjacent first flow channel 27s spaced apart, and the bottom wall 272 of the first flow channel 27 protrudes from the second surface 262, the liquid outlet flow channel 407 is formed by the bottom plate 30 and the lower surface of part of the second flow channel 244 together. This makes the liquid outlet flow channel 407 and the multiple second flow channels 404 basically at the same horizontal height in the thickness direction Z, thus making the connection between the multiple second flow channels 404 and the liquid outlet flow channel 407 simpler, and effectively improving the rationality of the structural design of the liquid cooling plate 400 connecting the liquid outlet flow channel 407 and the multiple second flow channels 404. It can be understood that one end of the multiple first flow channel 27 at the liquid outlet flow channel 407 is sealed to prevent the multiple first flow channels 402 and the liquid outlet flow channel 407 from connecting.

[0091] Figure 10 for Figure 4 Another cross-sectional view of the liquid cooling plate 400 in the width direction Y in the embodiment.

[0092] To form the third flow channel 405, refer to Figure 9 and Figure 10 The base plate 30 and the second surface 262 together enclose the area on one side of the starting end 4041 of the flow direction of the multiple second flow channels 404 in the length direction X to form the third flow channel 405. That is, the base plate 30 and the lower surface of part 243 together enclose the third flow channel 405. In this embodiment, since the first flow channel groove 27 is recessed towards the base plate 30, and the second flow channel groove 28 is formed by two adjacent first flow channel grooves 27 spaced apart, and the bottom wall 272 of the first flow channel groove 27 protrudes from the second surface 262, the third flow channel 405 is formed by the base plate 30 and the lower surface of part 243 together. This makes the third flow channel 405, the multiple first flow channels 402 and the multiple second flow channels 404 basically at the same horizontal height in the thickness direction Z. Therefore, the connection between the multiple second flow channels 404 and the third flow channel 405 can be achieved smoothly, and the structure of the liquid cooling plate 400 is simple. Furthermore, after opening through holes 25 at the end of the first flow channel 27, the connection between multiple first flow channel 27 and the third flow channel 405 is also achieved naturally. In summary, this can effectively reduce the manufacturing difficulty of the liquid cooling plate 400 and improve the structural rationality of the liquid cooling plate 400.

[0093] Reference Figure 7 and Figure 10The through hole 25 is located at the end of the first flow channel groove 27 along the length direction X, and the through hole 25 penetrates the flow channel plate 20 along the thickness direction Z, so that the end of the first flow channel groove 27 forms an opening 251, and the opening 251 can communicate with the third flow channel 405, so as to realize the connection between multiple first flow channels 402 and the third flow channel 405. Moreover, since the through hole 25 penetrates the flow channel plate 20 along the thickness direction Z, the through hole 25 can be easily processed during processing, such as requiring only a single vertical drilling (laser / mechanical drilling, etc.), without the need for multi-angle processing.

[0094] In addition, the through hole 25 is roughly circular, so as to guide the coolant as it passes through the multiple first flow channels 402, so that the coolant can smoothly transition to the third flow channel 405, which can effectively prevent turbulence.

[0095] Figure 11 for Figure 4 Another cross-sectional view of the liquid cooling plate 400 in the embodiment along the length direction X, and the cross-section is located at the position of the liquid outlet 202 and the liquid inlet 201.

[0096] Reference Figure 10 and Figure 11 The inlet channel 406 and outlet channel 407 are arranged in the thickness direction Z. The inlet port 201 and outlet port 202 of the liquid cooling plate 400 are both located on the substrate 10. The inlet port 201 is directly opposite to the inlet channel 406 in the thickness direction Z, and the inlet port 201 penetrates the channel plate 20 and communicates with the inlet channel 406. The outlet port 202 is directly opposite to the inlet channel 406 and outlet channel 407 in the thickness direction Z, respectively. 2. The water inlet 41 is installed in the liquid inlet 201 and connected to the liquid inlet channel 406. The water outlet 42 is installed in the liquid outlet 202 and connected to the liquid outlet channel 407. After the water outlet 42 is installed on the liquid outlet 202, the liquid outlet and the liquid inlet channel 406 are in a sealed state, and there will be no crossflow of coolant in the liquid inlet channel 406 and the liquid outlet channel 407.

[0097] Because the inlet channel 406 and outlet channel 407 are arranged in the thickness direction Z, and the inlet 201 and outlet 202 of the liquid cooling plate 400 are both located on the substrate 10 directly opposite the inlet channel 406, this vertically aligned connection achieves the shortest and lowest resistance path for the coolant from the external piping to the internal functional channels (inlet channel 406 and outlet channel 407), effectively optimizing flow and heat dissipation performance. Furthermore, all external water pipe connections are concentrated on the same side of the liquid cooling plate 400, facilitating centralized arrangement and routing of external piping, thus improving the overall energy storage device 1000 (e.g., Figure 1 The layout inside is neater and more compact.

[0098] It is understood that in some other embodiments, the inlet channel 406 and the outlet channel 407 may not be directly opposite each other in the thickness direction Z.

[0099] Figure 12A This is a perspective view of another liquid cooling plate 400 provided in an embodiment of this application. Figure 12B for Figure 12A A schematic diagram of the flow channel plate 20 in the embodiment. Figure 12A and Figure 12B The liquid cooling plate 400 in the embodiment is the same Figure 4 The main difference between the liquid cooling plate 400 in the embodiment and the one in the embodiment is the shape of the through hole 25. As for the difference between the two embodiments, the one in the embodiment is the one in the embodiment. Figure 4 The same parts of the liquid cooling plate 400 in the embodiments can be referred to in the foregoing embodiments, and will not be repeated here.

[0100] Reference Figure 12A and Figure 12B The through hole 25 extends along the length direction X through one end of the first flow channel groove 27 toward the third flow channel 405, thereby connecting the first flow channel groove 27 and the third flow channel 405. In this embodiment, the through hole 25 can be formed by drilling along the length direction X to open up the end of the first flow channel groove 27 toward the third flow channel 405. In this embodiment, since part 243 is not used to form the through hole 25, a larger area of ​​part 243 can be used for connection with the substrate 10, thereby improving the connection strength and sealing between the substrate 10 and the flow channel plate 20.

[0101] Figure 13 Simplified diagrams of three more liquid cooling plates 400 provided in the embodiments of this application. Figure 13 The liquid cooling plate 400 in this embodiment is based on the liquid cooling plate 400 in the above embodiment with the addition of protrusions 50.

[0102] Reference Figure 13 The liquid cooling plate 400 also includes a plurality of protrusions 50, which are disposed within the first flow channel 402 or the second flow channel 404 (e.g., Figure 5 Multiple bumps 50 are spaced apart along the length direction X. Specifically, the multiple bumps 50 are disposed within multiple second flow channels 404 or multiple first flow channels 402, and are spaced apart along the extension direction of the second flow channels 404 or the first flow channels 402. The arrangement of the bumps 50 can achieve a flow-around effect, thereby improving the interaction between the coolant and the battery cell 600 (e.g., ...). Figure 2 The heat exchange efficiency is improved. The shape of the bump 50 can be varied, such as a rectangle, circle or ellipse as shown in the figure. Of course, in some other embodiments, the bump 50 can also be other shapes.

[0103] 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 technical scope 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, The liquid cooling plate includes a substrate, a flow channel plate, and a bottom plate stacked in the thickness direction of the liquid cooling plate; In the thickness direction, the upper surface of the flow channel plate is provided with multiple first flow channel grooves, and the lower surface of the flow channel plate is provided with multiple second flow channel grooves. The upper surface of the flow channel plate is attached to the substrate and seals the multiple first flow channel grooves to form multiple first flow channels; the lower surface of the flow channel plate is attached to the base plate and seals the multiple second flow channel grooves to form multiple second flow channels. In the width direction of the liquid cooling plate, the plurality of first flow channels and the plurality of second flow channels are arranged alternately; The third flow channel is located at one end of the liquid cooling plate along its length and extends along its width. All of the multiple first flow channels are connected to the third flow channel, and all of the multiple second flow channels are connected to the third flow channel. The flow direction of the multiple first flow channels is opposite to that of the multiple second flow channels.

2. The liquid cooling plate according to claim 1, characterized in that, The flow channel plate is stamped to form the plurality of first flow channel grooves and the plurality of second flow channel grooves. One of the first flow channel grooves and two of the second flow channel grooves on adjacent sides in the width direction share a portion of the flow channel plate.

3. The liquid cooling plate according to claim 1, characterized in that, The flow channel plate has through holes that penetrate the flow channel plate, and the through holes connect the multiple first flow channels and the third flow channel.

4. The liquid cooling plate according to claim 2, characterized in that, The flow channel plate has through holes that penetrate the flow channel plate, and the through holes connect the multiple first flow channels and the third flow channel.

5. The liquid cooling plate according to claim 3, characterized in that, The through hole is located at the end of the flow direction of the plurality of first flow channels.

6. The liquid cooling plate according to claim 3, characterized in that, The plurality of first flow channel grooves extend along the length of the liquid cooling plate to the through hole and communicate with the through hole.

7. The liquid-cooled plate according to any one of claims 3-6, characterized in that, The base plate covers the lower surface of the flow channel plate to form the third flow channel, which is located at the starting end of the flow direction of the plurality of second flow channels and is connected to the starting end of the plurality of second flow channels.

8. The liquid-cooled plate according to any one of claims 1-6, characterized in that, The base plate and the area on the lower surface of the flow channel plate located on one side of the starting end of the flow direction of the plurality of second flow channels in the length direction together enclose the third flow channel.

9. The liquid-cooled plate according to any one of claims 1-6, characterized in that, The plurality of first flow channel grooves are arranged at intervals along the width direction. The outer walls of the plurality of first flow channel grooves protrude from the lower surface of the flow channel plate in the direction of the bottom plate. The outer walls of any two adjacent first flow channel grooves in the plurality of first flow channel grooves form a second flow channel groove in the area of ​​the interval in the width direction. The lower surface of the flow channel plate between the outer walls of two adjacent first flow channel grooves constitutes the inner surface of the bottom wall of the second flow channel groove.

10. The liquid-cooled plate according to any one of claims 1-6, characterized in that, The upper surface of the flow channel plate between two adjacent first flow channel grooves forms the outer surface of the bottom wall of the second flow channel groove, and the substrate contacts and connects with the outer surface of the bottom wall of the second flow channel groove.

11. The liquid cooling plate according to claim 9, characterized in that, The upper surface of the flow channel plate between two adjacent first flow channel grooves forms the outer surface of the bottom wall of the second flow channel groove, and the substrate contacts and connects with the outer surface of the bottom wall of the second flow channel groove.

12. The liquid-cooled plate according to any one of claims 1-6, characterized in that, The base plate includes a folded edge formed by bending from the circumferential edge of the base plate toward the flow channel plate, and the folded edge is connected to the edge of the lower surface of the flow channel plate.

13. The liquid-cooled plate according to any one of claims 1-6, characterized in that, The base plate and the lower surface of the flow channel plate together enclose the area on one side of the end of the flow direction of the plurality of second flow channels in the length direction to form a liquid outlet flow channel, which is used to communicate with the liquid outlet of the liquid cooling plate.

14. The liquid cooling plate according to claim 13, characterized in that, The substrate has a liquid inlet groove on its surface facing the flow channel plate. The liquid inlet groove extends along the width direction. The upper surface of the flow channel plate covers the liquid inlet groove to form a liquid inlet channel. The liquid inlet channel is located on one side of the starting end of the flow direction of the plurality of first channels in the length direction. The starting ends of the plurality of first channels extend to the liquid inlet channel and communicate with the liquid inlet channel. The liquid inlet channel is used to communicate with the liquid inlet of the liquid cooling plate.

15. The liquid-cooled plate according to claim 14, characterized in that, The liquid inlet channel and the liquid outlet channel are arranged in the thickness direction. The liquid inlet and the liquid outlet of the liquid cooling plate are both located on the substrate. The liquid inlet is directly opposite to the liquid inlet channel in the thickness direction. The liquid inlet passes through the channel plate and communicates with the liquid inlet channel. The liquid outlet is directly opposite to the liquid inlet channel and the liquid outlet channel in the thickness direction, respectively. The liquid outlet passes through the substrate and the channel plate and communicates with the liquid outlet channel.

16. A battery pack, characterized in that, The battery pack includes a plurality of battery cells and a liquid cooling plate as described in any one of claims 1-15, wherein the plurality of battery cells are disposed on the substrate in the thickness direction.

17. The battery pack according to claim 16, characterized in that, In the thickness direction, any one of the plurality of cells is directly opposite the first flow channel and the second flow channel.

18. An energy storage device, characterized in that, The energy storage device includes a liquid cooling unit and a battery pack. The battery pack includes a liquid cooling plate as described in any one of claims 1-15. The liquid cooling unit is connected to the liquid inlet and liquid outlet of the liquid cooling plate, respectively, and the liquid cooling unit is used to supply coolant to the liquid cooling plate.

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